cgltf.h

 
#ifndef CGLTF_H_INCLUDED__
#define CGLTF_H_INCLUDED__
 
#include <stddef.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef size_t cgltf_size;
typedef long long int cgltf_ssize;
typedef float cgltf_float;
typedef int cgltf_int;
typedef unsigned int cgltf_uint;
typedef int cgltf_bool;
 
typedef enum cgltf_file_type
{
   cgltf_file_type_invalid,
   cgltf_file_type_gltf,
   cgltf_file_type_glb,
   cgltf_file_type_max_enum
} cgltf_file_type;
 
typedef enum cgltf_result
{
   cgltf_result_success,
   cgltf_result_data_too_short,
   cgltf_result_unknown_format,
   cgltf_result_invalid_json,
   cgltf_result_invalid_gltf,
   cgltf_result_invalid_options,
   cgltf_result_file_not_found,
   cgltf_result_io_error,
   cgltf_result_out_of_memory,
   cgltf_result_legacy_gltf,
    cgltf_result_max_enum
} cgltf_result;
 
typedef struct cgltf_memory_options
{
   void* (*alloc_func)(void* user, cgltf_size size);
   void (*free_func) (void* user, void* ptr);
   void* user_data;
} cgltf_memory_options;
 
typedef struct cgltf_file_options
{
   cgltf_result(*read)(const struct cgltf_memory_options* memory_options, const struct cgltf_file_options* file_options, const char* path, cgltf_size* size, void** data);
   void (*release)(const struct cgltf_memory_options* memory_options, const struct cgltf_file_options* file_options, void* data);
   void* user_data;
} cgltf_file_options;
 
typedef struct cgltf_options
{
   cgltf_file_type type; /* invalid == auto detect */
   cgltf_size json_token_count; /* 0 == auto */
   cgltf_memory_options memory;
   cgltf_file_options file;
} cgltf_options;
 
typedef enum cgltf_buffer_view_type
{
   cgltf_buffer_view_type_invalid,
   cgltf_buffer_view_type_indices,
   cgltf_buffer_view_type_vertices,
   cgltf_buffer_view_type_max_enum
} cgltf_buffer_view_type;
 
typedef enum cgltf_attribute_type
{
   cgltf_attribute_type_invalid,
   cgltf_attribute_type_position,
   cgltf_attribute_type_normal,
   cgltf_attribute_type_tangent,
   cgltf_attribute_type_texcoord,
   cgltf_attribute_type_color,
   cgltf_attribute_type_joints,
   cgltf_attribute_type_weights,
   cgltf_attribute_type_custom,
   cgltf_attribute_type_max_enum
} cgltf_attribute_type;
 
typedef enum cgltf_component_type
{
   cgltf_component_type_invalid,
   cgltf_component_type_r_8, /* BYTE */
   cgltf_component_type_r_8u, /* UNSIGNED_BYTE */
   cgltf_component_type_r_16, /* SHORT */
   cgltf_component_type_r_16u, /* UNSIGNED_SHORT */
   cgltf_component_type_r_32u, /* UNSIGNED_INT */
   cgltf_component_type_r_32f, /* FLOAT */
    cgltf_component_type_max_enum
} cgltf_component_type;
 
typedef enum cgltf_type
{
   cgltf_type_invalid,
   cgltf_type_scalar,
   cgltf_type_vec2,
   cgltf_type_vec3,
   cgltf_type_vec4,
   cgltf_type_mat2,
   cgltf_type_mat3,
   cgltf_type_mat4,
   cgltf_type_max_enum
} cgltf_type;
 
typedef enum cgltf_primitive_type
{
   cgltf_primitive_type_points,
   cgltf_primitive_type_lines,
   cgltf_primitive_type_line_loop,
   cgltf_primitive_type_line_strip,
   cgltf_primitive_type_triangles,
   cgltf_primitive_type_triangle_strip,
   cgltf_primitive_type_triangle_fan,
   cgltf_primitive_type_max_enum
} cgltf_primitive_type;
 
typedef enum cgltf_alpha_mode
{
   cgltf_alpha_mode_opaque,
   cgltf_alpha_mode_mask,
   cgltf_alpha_mode_blend,
   cgltf_alpha_mode_max_enum
} cgltf_alpha_mode;
 
typedef enum cgltf_animation_path_type {
   cgltf_animation_path_type_invalid,
   cgltf_animation_path_type_translation,
   cgltf_animation_path_type_rotation,
   cgltf_animation_path_type_scale,
   cgltf_animation_path_type_weights,
   cgltf_animation_path_type_max_enum
} cgltf_animation_path_type;
 
typedef enum cgltf_interpolation_type {
   cgltf_interpolation_type_linear,
   cgltf_interpolation_type_step,
   cgltf_interpolation_type_cubic_spline,
   cgltf_interpolation_type_max_enum
} cgltf_interpolation_type;
 
typedef enum cgltf_camera_type {
   cgltf_camera_type_invalid,
   cgltf_camera_type_perspective,
   cgltf_camera_type_orthographic,
   cgltf_camera_type_max_enum
} cgltf_camera_type;
 
typedef enum cgltf_light_type {
   cgltf_light_type_invalid,
   cgltf_light_type_directional,
   cgltf_light_type_point,
   cgltf_light_type_spot,
   cgltf_light_type_max_enum
} cgltf_light_type;
 
typedef enum cgltf_data_free_method {
   cgltf_data_free_method_none,
   cgltf_data_free_method_file_release,
   cgltf_data_free_method_memory_free,
   cgltf_data_free_method_max_enum
} cgltf_data_free_method;
 
typedef struct cgltf_extras {
   cgltf_size start_offset;
   cgltf_size end_offset;
} cgltf_extras;
 
typedef struct cgltf_extension {
   char* name;
   char* data;
} cgltf_extension;
 
typedef struct cgltf_buffer
{
   char* name;
   cgltf_size size;
   char* uri;
   void* data; /* loaded by cgltf_load_buffers */
   cgltf_data_free_method data_free_method;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_buffer;
 
typedef enum cgltf_meshopt_compression_mode {
   cgltf_meshopt_compression_mode_invalid,
   cgltf_meshopt_compression_mode_attributes,
   cgltf_meshopt_compression_mode_triangles,
   cgltf_meshopt_compression_mode_indices,
   cgltf_meshopt_compression_mode_max_enum
} cgltf_meshopt_compression_mode;
 
typedef enum cgltf_meshopt_compression_filter {
   cgltf_meshopt_compression_filter_none,
   cgltf_meshopt_compression_filter_octahedral,
   cgltf_meshopt_compression_filter_quaternion,
   cgltf_meshopt_compression_filter_exponential,
   cgltf_meshopt_compression_filter_max_enum
} cgltf_meshopt_compression_filter;
 
typedef struct cgltf_meshopt_compression
{
   cgltf_buffer* buffer;
   cgltf_size offset;
   cgltf_size size;
   cgltf_size stride;
   cgltf_size count;
   cgltf_meshopt_compression_mode mode;
   cgltf_meshopt_compression_filter filter;
} cgltf_meshopt_compression;
 
typedef struct cgltf_buffer_view
{
   char *name;
   cgltf_buffer* buffer;
   cgltf_size offset;
   cgltf_size size;
   cgltf_size stride; /* 0 == automatically determined by accessor */
   cgltf_buffer_view_type type;
   void* data; /* overrides buffer->data if present, filled by extensions */
   cgltf_bool has_meshopt_compression;
   cgltf_meshopt_compression meshopt_compression;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_buffer_view;
 
typedef struct cgltf_accessor_sparse
{
   cgltf_size count;
   cgltf_buffer_view* indices_buffer_view;
   cgltf_size indices_byte_offset;
   cgltf_component_type indices_component_type;
   cgltf_buffer_view* values_buffer_view;
   cgltf_size values_byte_offset;
   cgltf_extras extras;
   cgltf_extras indices_extras;
   cgltf_extras values_extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
   cgltf_size indices_extensions_count;
   cgltf_extension* indices_extensions;
   cgltf_size values_extensions_count;
   cgltf_extension* values_extensions;
} cgltf_accessor_sparse;
 
typedef struct cgltf_accessor
{
   char* name;
   cgltf_component_type component_type;
   cgltf_bool normalized;
   cgltf_type type;
   cgltf_size offset;
   cgltf_size count;
   cgltf_size stride;
   cgltf_buffer_view* buffer_view;
   cgltf_bool has_min;
   cgltf_float min[16];
   cgltf_bool has_max;
   cgltf_float max[16];
   cgltf_bool is_sparse;
   cgltf_accessor_sparse sparse;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_accessor;
 
typedef struct cgltf_attribute
{
   char* name;
   cgltf_attribute_type type;
   cgltf_int index;
   cgltf_accessor* data;
} cgltf_attribute;
 
typedef struct cgltf_image
{
   char* name;
   char* uri;
   cgltf_buffer_view* buffer_view;
   char* mime_type;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_image;
 
typedef struct cgltf_sampler
{
   char* name;
   cgltf_int mag_filter;
   cgltf_int min_filter;
   cgltf_int wrap_s;
   cgltf_int wrap_t;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_sampler;
 
typedef struct cgltf_texture
{
   char* name;
   cgltf_image* image;
   cgltf_sampler* sampler;
   cgltf_bool has_basisu;
   cgltf_image* basisu_image;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_texture;
 
typedef struct cgltf_texture_transform
{
   cgltf_float offset[2];
   cgltf_float rotation;
   cgltf_float scale[2];
   cgltf_bool has_texcoord;
   cgltf_int texcoord;
} cgltf_texture_transform;
 
typedef struct cgltf_texture_view
{
   cgltf_texture* texture;
   cgltf_int texcoord;
   cgltf_float scale; /* equivalent to strength for occlusion_texture */
   cgltf_bool has_transform;
   cgltf_texture_transform transform;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_texture_view;
 
typedef struct cgltf_pbr_metallic_roughness
{
   cgltf_texture_view base_color_texture;
   cgltf_texture_view metallic_roughness_texture;
 
   cgltf_float base_color_factor[4];
   cgltf_float metallic_factor;
   cgltf_float roughness_factor;
 
   cgltf_extras extras;
} cgltf_pbr_metallic_roughness;
 
typedef struct cgltf_pbr_specular_glossiness
{
   cgltf_texture_view diffuse_texture;
   cgltf_texture_view specular_glossiness_texture;
 
   cgltf_float diffuse_factor[4];
   cgltf_float specular_factor[3];
   cgltf_float glossiness_factor;
} cgltf_pbr_specular_glossiness;
 
typedef struct cgltf_clearcoat
{
   cgltf_texture_view clearcoat_texture;
   cgltf_texture_view clearcoat_roughness_texture;
   cgltf_texture_view clearcoat_normal_texture;
 
   cgltf_float clearcoat_factor;
   cgltf_float clearcoat_roughness_factor;
} cgltf_clearcoat;
 
typedef struct cgltf_transmission
{
   cgltf_texture_view transmission_texture;
   cgltf_float transmission_factor;
} cgltf_transmission;
 
typedef struct cgltf_ior
{
   cgltf_float ior;
} cgltf_ior;
 
typedef struct cgltf_specular
{
   cgltf_texture_view specular_texture;
   cgltf_texture_view specular_color_texture;
   cgltf_float specular_color_factor[3];
   cgltf_float specular_factor;
} cgltf_specular;
 
typedef struct cgltf_volume
{
   cgltf_texture_view thickness_texture;
   cgltf_float thickness_factor;
   cgltf_float attenuation_color[3];
   cgltf_float attenuation_distance;
} cgltf_volume;
 
typedef struct cgltf_sheen
{
   cgltf_texture_view sheen_color_texture;
   cgltf_float sheen_color_factor[3];
   cgltf_texture_view sheen_roughness_texture;
   cgltf_float sheen_roughness_factor;
} cgltf_sheen;
 
typedef struct cgltf_emissive_strength
{
   cgltf_float emissive_strength;
} cgltf_emissive_strength;
 
typedef struct cgltf_iridescence
{
   cgltf_float iridescence_factor;
   cgltf_texture_view iridescence_texture;
   cgltf_float iridescence_ior;
   cgltf_float iridescence_thickness_min;
   cgltf_float iridescence_thickness_max;
   cgltf_texture_view iridescence_thickness_texture;
} cgltf_iridescence;
 
typedef struct cgltf_material
{
   char* name;
   cgltf_bool has_pbr_metallic_roughness;
   cgltf_bool has_pbr_specular_glossiness;
   cgltf_bool has_clearcoat;
   cgltf_bool has_transmission;
   cgltf_bool has_volume;
   cgltf_bool has_ior;
   cgltf_bool has_specular;
   cgltf_bool has_sheen;
   cgltf_bool has_emissive_strength;
   cgltf_bool has_iridescence;
   cgltf_pbr_metallic_roughness pbr_metallic_roughness;
   cgltf_pbr_specular_glossiness pbr_specular_glossiness;
   cgltf_clearcoat clearcoat;
   cgltf_ior ior;
   cgltf_specular specular;
   cgltf_sheen sheen;
   cgltf_transmission transmission;
   cgltf_volume volume;
   cgltf_emissive_strength emissive_strength;
   cgltf_iridescence iridescence;
   cgltf_texture_view normal_texture;
   cgltf_texture_view occlusion_texture;
   cgltf_texture_view emissive_texture;
   cgltf_float emissive_factor[3];
   cgltf_alpha_mode alpha_mode;
   cgltf_float alpha_cutoff;
   cgltf_bool double_sided;
   cgltf_bool unlit;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_material;
 
typedef struct cgltf_material_mapping
{
   cgltf_size variant;
   cgltf_material* material;
   cgltf_extras extras;
} cgltf_material_mapping;
 
typedef struct cgltf_morph_target {
   cgltf_attribute* attributes;
   cgltf_size attributes_count;
} cgltf_morph_target;
 
typedef struct cgltf_draco_mesh_compression {
   cgltf_buffer_view* buffer_view;
   cgltf_attribute* attributes;
   cgltf_size attributes_count;
} cgltf_draco_mesh_compression;
 
typedef struct cgltf_mesh_gpu_instancing {
   cgltf_buffer_view* buffer_view;
   cgltf_attribute* attributes;
   cgltf_size attributes_count;
} cgltf_mesh_gpu_instancing;
 
typedef struct cgltf_primitive {
   cgltf_primitive_type type;
   cgltf_accessor* indices;
   cgltf_material* material;
   cgltf_attribute* attributes;
   cgltf_size attributes_count;
   cgltf_morph_target* targets;
   cgltf_size targets_count;
   cgltf_extras extras;
   cgltf_bool has_draco_mesh_compression;
   cgltf_draco_mesh_compression draco_mesh_compression;
   cgltf_material_mapping* mappings;
   cgltf_size mappings_count;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_primitive;
 
typedef struct cgltf_mesh {
   char* name;
   cgltf_primitive* primitives;
   cgltf_size primitives_count;
   cgltf_float* weights;
   cgltf_size weights_count;
   char** target_names;
   cgltf_size target_names_count;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_mesh;
 
typedef struct cgltf_node cgltf_node;
 
typedef struct cgltf_skin {
   char* name;
   cgltf_node** joints;
   cgltf_size joints_count;
   cgltf_node* skeleton;
   cgltf_accessor* inverse_bind_matrices;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_skin;
 
typedef struct cgltf_camera_perspective {
   cgltf_bool has_aspect_ratio;
   cgltf_float aspect_ratio;
   cgltf_float yfov;
   cgltf_bool has_zfar;
   cgltf_float zfar;
   cgltf_float znear;
   cgltf_extras extras;
} cgltf_camera_perspective;
 
typedef struct cgltf_camera_orthographic {
   cgltf_float xmag;
   cgltf_float ymag;
   cgltf_float zfar;
   cgltf_float znear;
   cgltf_extras extras;
} cgltf_camera_orthographic;
 
typedef struct cgltf_camera {
   char* name;
   cgltf_camera_type type;
   union {
      cgltf_camera_perspective perspective;
      cgltf_camera_orthographic orthographic;
   } data;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_camera;
 
typedef struct cgltf_light {
   char* name;
   cgltf_float color[3];
   cgltf_float intensity;
   cgltf_light_type type;
   cgltf_float range;
   cgltf_float spot_inner_cone_angle;
   cgltf_float spot_outer_cone_angle;
   cgltf_extras extras;
} cgltf_light;
 
struct cgltf_node {
   char* name;
   cgltf_node* parent;
   cgltf_node** children;
   cgltf_size children_count;
   cgltf_skin* skin;
   cgltf_mesh* mesh;
   cgltf_camera* camera;
   cgltf_light* light;
   cgltf_float* weights;
   cgltf_size weights_count;
   cgltf_bool has_translation;
   cgltf_bool has_rotation;
   cgltf_bool has_scale;
   cgltf_bool has_matrix;
   cgltf_float translation[3];
   cgltf_float rotation[4];
   cgltf_float scale[3];
   cgltf_float matrix[16];
   cgltf_extras extras;
   cgltf_bool has_mesh_gpu_instancing;
   cgltf_mesh_gpu_instancing mesh_gpu_instancing;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
};
 
typedef struct cgltf_scene {
   char* name;
   cgltf_node** nodes;
   cgltf_size nodes_count;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_scene;
 
typedef struct cgltf_animation_sampler {
   cgltf_accessor* input;
   cgltf_accessor* output;
   cgltf_interpolation_type interpolation;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_animation_sampler;
 
typedef struct cgltf_animation_channel {
   cgltf_animation_sampler* sampler;
   cgltf_node* target_node;
   cgltf_animation_path_type target_path;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_animation_channel;
 
typedef struct cgltf_animation {
   char* name;
   cgltf_animation_sampler* samplers;
   cgltf_size samplers_count;
   cgltf_animation_channel* channels;
   cgltf_size channels_count;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_animation;
 
typedef struct cgltf_material_variant
{
   char* name;
   cgltf_extras extras;
} cgltf_material_variant;
 
typedef struct cgltf_asset {
   char* copyright;
   char* generator;
   char* version;
   char* min_version;
   cgltf_extras extras;
   cgltf_size extensions_count;
   cgltf_extension* extensions;
} cgltf_asset;
 
typedef struct cgltf_data
{
   cgltf_file_type file_type;
   void* file_data;
 
   cgltf_asset asset;
 
   cgltf_mesh* meshes;
   cgltf_size meshes_count;
 
   cgltf_material* materials;
   cgltf_size materials_count;
 
   cgltf_accessor* accessors;
   cgltf_size accessors_count;
 
   cgltf_buffer_view* buffer_views;
   cgltf_size buffer_views_count;
 
   cgltf_buffer* buffers;
   cgltf_size buffers_count;
 
   cgltf_image* images;
   cgltf_size images_count;
 
   cgltf_texture* textures;
   cgltf_size textures_count;
 
   cgltf_sampler* samplers;
   cgltf_size samplers_count;
 
   cgltf_skin* skins;
   cgltf_size skins_count;
 
   cgltf_camera* cameras;
   cgltf_size cameras_count;
 
   cgltf_light* lights;
   cgltf_size lights_count;
 
   cgltf_node* nodes;
   cgltf_size nodes_count;
 
   cgltf_scene* scenes;
   cgltf_size scenes_count;
 
   cgltf_scene* scene;
 
   cgltf_animation* animations;
   cgltf_size animations_count;
 
   cgltf_material_variant* variants;
   cgltf_size variants_count;
 
   cgltf_extras extras;
 
   cgltf_size data_extensions_count;
   cgltf_extension* data_extensions;
 
   char** extensions_used;
   cgltf_size extensions_used_count;
 
   char** extensions_required;
   cgltf_size extensions_required_count;
 
   const char* json;
   cgltf_size json_size;
 
   const void* bin;
   cgltf_size bin_size;
 
   cgltf_memory_options memory;
   cgltf_file_options file;
} cgltf_data;
 
cgltf_result cgltf_parse(
      const cgltf_options* options,
      const void* data,
      cgltf_size size,
      cgltf_data** out_data);
 
cgltf_result cgltf_parse_file(
      const cgltf_options* options,
      const char* path,
      cgltf_data** out_data);
 
cgltf_result cgltf_load_buffers(
      const cgltf_options* options,
      cgltf_data* data,
      const char* gltf_path);
 
cgltf_result cgltf_load_buffer_base64(const cgltf_options* options, cgltf_size size, const char* base64, void** out_data);
 
cgltf_size cgltf_decode_string(char* string);
cgltf_size cgltf_decode_uri(char* uri);
 
cgltf_result cgltf_validate(cgltf_data* data);
 
void cgltf_free(cgltf_data* data);
 
void cgltf_node_transform_local(const cgltf_node* node, cgltf_float* out_matrix);
void cgltf_node_transform_world(const cgltf_node* node, cgltf_float* out_matrix);
 
cgltf_bool cgltf_accessor_read_float(const cgltf_accessor* accessor, cgltf_size index, cgltf_float* out, cgltf_size element_size);
cgltf_bool cgltf_accessor_read_uint(const cgltf_accessor* accessor, cgltf_size index, cgltf_uint* out, cgltf_size element_size);
cgltf_size cgltf_accessor_read_index(const cgltf_accessor* accessor, cgltf_size index);
 
cgltf_size cgltf_num_components(cgltf_type type);
 
cgltf_size cgltf_accessor_unpack_floats(const cgltf_accessor* accessor, cgltf_float* out, cgltf_size float_count);
 
cgltf_result cgltf_copy_extras_json(const cgltf_data* data, const cgltf_extras* extras, char* dest, cgltf_size* dest_size);
 
#ifdef __cplusplus
}
#endif
 
#endif /* #ifndef CGLTF_H_INCLUDED__ */
 
/*
 *
 * Stop now, if you are only interested in the API.
 * Below, you find the implementation.
 *
 */
 
#if defined(__INTELLISENSE__) || defined(__JETBRAINS_IDE__)
/* This makes MSVC/CLion intellisense work. */
#define CGLTF_IMPLEMENTATION
#endif
 
#ifdef CGLTF_IMPLEMENTATION
 
#include <stdint.h> /* For uint8_t, uint32_t */
#include <string.h> /* For strncpy */
#include <stdio.h>  /* For fopen */
#include <limits.h> /* For UINT_MAX etc */
#include <float.h>  /* For FLT_MAX */
 
#if !defined(CGLTF_MALLOC) || !defined(CGLTF_FREE) || !defined(CGLTF_ATOI) || !defined(CGLTF_ATOF) || !defined(CGLTF_ATOLL)
#include <stdlib.h> /* For malloc, free, atoi, atof */
#endif
 
#if CGLTF_VALIDATE_ENABLE_ASSERTS
#include <assert.h>
#endif
 
/* JSMN_PARENT_LINKS is necessary to make parsing large structures linear in input size */
#define JSMN_PARENT_LINKS
 
/* JSMN_STRICT is necessary to reject invalid JSON documents */
#define JSMN_STRICT
 
/*
 * -- jsmn.h start --
 * Source: https://github.com/zserge/jsmn
 * License: MIT
 */
typedef enum {
   JSMN_UNDEFINED = 0,
   JSMN_OBJECT = 1,
   JSMN_ARRAY = 2,
   JSMN_STRING = 3,
   JSMN_PRIMITIVE = 4
} jsmntype_t;
enum jsmnerr {
   /* Not enough tokens were provided */
   JSMN_ERROR_NOMEM = -1,
   /* Invalid character inside JSON string */
   JSMN_ERROR_INVAL = -2,
   /* The string is not a full JSON packet, more bytes expected */
   JSMN_ERROR_PART = -3
};
typedef struct {
   jsmntype_t type;
   int start;
   int end;
   int size;
#ifdef JSMN_PARENT_LINKS
   int parent;
#endif
} jsmntok_t;
typedef struct {
   unsigned int pos; /* offset in the JSON string */
   unsigned int toknext; /* next token to allocate */
   int toksuper; /* superior token node, e.g parent object or array */
} jsmn_parser;
static void jsmn_init(jsmn_parser *parser);
static int jsmn_parse(jsmn_parser *parser, const char *js, size_t len, jsmntok_t *tokens, size_t num_tokens);
/*
 * -- jsmn.h end --
 */
 
 
static const cgltf_size GlbHeaderSize = 12;
static const cgltf_size GlbChunkHeaderSize = 8;
static const uint32_t GlbVersion = 2;
static const uint32_t GlbMagic = 0x46546C67;
static const uint32_t GlbMagicJsonChunk = 0x4E4F534A;
static const uint32_t GlbMagicBinChunk = 0x004E4942;
 
#ifndef CGLTF_MALLOC
#define CGLTF_MALLOC(size) malloc(size)
#endif
#ifndef CGLTF_FREE
#define CGLTF_FREE(ptr) free(ptr)
#endif
#ifndef CGLTF_ATOI
#define CGLTF_ATOI(str) atoi(str)
#endif
#ifndef CGLTF_ATOF
#define CGLTF_ATOF(str) atof(str)
#endif
#ifndef CGLTF_ATOLL
#define CGLTF_ATOLL(str) atoll(str)
#endif
#ifndef CGLTF_VALIDATE_ENABLE_ASSERTS
#define CGLTF_VALIDATE_ENABLE_ASSERTS 0
#endif
 
static void* cgltf_default_alloc(void* user, cgltf_size size)
{
   (void)user;
   return CGLTF_MALLOC(size);
}
 
static void cgltf_default_free(void* user, void* ptr)
{
   (void)user;
   CGLTF_FREE(ptr);
}
 
static void* cgltf_calloc(cgltf_options* options, size_t element_size, cgltf_size count)
{
   if (SIZE_MAX / element_size < count)
   {
      return NULL;
   }
   void* result = options->memory.alloc_func(options->memory.user_data, element_size * count);
   if (!result)
   {
      return NULL;
   }
   memset(result, 0, element_size * count);
   return result;
}
 
static cgltf_result cgltf_default_file_read(const struct cgltf_memory_options* memory_options, const struct cgltf_file_options* file_options, const char* path, cgltf_size* size, void** data)
{
   (void)file_options;
   void* (*memory_alloc)(void*, cgltf_size) = memory_options->alloc_func ? memory_options->alloc_func : &cgltf_default_alloc;
   void (*memory_free)(void*, void*) = memory_options->free_func ? memory_options->free_func : &cgltf_default_free;
 
   FILE* file = fopen(path, "rb");
   if (!file)
   {
      return cgltf_result_file_not_found;
   }
 
   cgltf_size file_size = size ? *size : 0;
 
   if (file_size == 0)
   {
      fseek(file, 0, SEEK_END);
 
#ifdef ___WIN32__
      __int64 length = _ftelli64(file);
#else
      long length = ftell(file);
#endif
 
      if (length < 0)
      {
         fclose(file);
         return cgltf_result_io_error;
      }
 
      fseek(file, 0, SEEK_SET);
      file_size = (cgltf_size)length;
   }
 
   char* file_data = (char*)memory_alloc(memory_options->user_data, file_size);
   if (!file_data)
   {
      fclose(file);
      return cgltf_result_out_of_memory;
   }
 
   cgltf_size read_size = fread(file_data, 1, file_size, file);
 
   fclose(file);
 
   if (read_size != file_size)
   {
      memory_free(memory_options->user_data, file_data);
      return cgltf_result_io_error;
   }
 
   if (size)
   {
      *size = file_size;
   }
   if (data)
   {
      *data = file_data;
   }
 
   return cgltf_result_success;
}
 
static void cgltf_default_file_release(const struct cgltf_memory_options* memory_options, const struct cgltf_file_options* file_options, void* data)
{
   (void)file_options;
   void (*memfree)(void*, void*) = memory_options->free_func ? memory_options->free_func : &cgltf_default_free;
   memfree(memory_options->user_data, data);
}
 
static cgltf_result cgltf_parse_json(cgltf_options* options, const uint8_t* json_chunk, cgltf_size size, cgltf_data** out_data);
 
cgltf_result cgltf_parse(const cgltf_options* options, const void* data, cgltf_size size, cgltf_data** out_data)
{
   if (size < GlbHeaderSize)
   {
      return cgltf_result_data_too_short;
   }
 
   if (options == NULL)
   {
      return cgltf_result_invalid_options;
   }
 
   cgltf_options fixed_options = *options;
   if (fixed_options.memory.alloc_func == NULL)
   {
      fixed_options.memory.alloc_func = &cgltf_default_alloc;
   }
   if (fixed_options.memory.free_func == NULL)
   {
      fixed_options.memory.free_func = &cgltf_default_free;
   }
 
   uint32_t tmp;
   // Magic
   memcpy(&tmp, data, 4);
   if (tmp != GlbMagic)
   {
      if (fixed_options.type == cgltf_file_type_invalid)
      {
         fixed_options.type = cgltf_file_type_gltf;
      }
      else if (fixed_options.type == cgltf_file_type_glb)
      {
         return cgltf_result_unknown_format;
      }
   }
 
   if (fixed_options.type == cgltf_file_type_gltf)
   {
      cgltf_result json_result = cgltf_parse_json(&fixed_options, (const uint8_t*)data, size, out_data);
      if (json_result != cgltf_result_success)
      {
         return json_result;
      }
 
      (*out_data)->file_type = cgltf_file_type_gltf;
 
      return cgltf_result_success;
   }
 
   const uint8_t* ptr = (const uint8_t*)data;
   // Version
   memcpy(&tmp, ptr + 4, 4);
   uint32_t version = tmp;
   if (version != GlbVersion)
   {
      return version < GlbVersion ? cgltf_result_legacy_gltf : cgltf_result_unknown_format;
   }
 
   // Total length
   memcpy(&tmp, ptr + 8, 4);
   if (tmp > size)
   {
      return cgltf_result_data_too_short;
   }
 
   const uint8_t* json_chunk = ptr + GlbHeaderSize;
 
   if (GlbHeaderSize + GlbChunkHeaderSize > size)
   {
      return cgltf_result_data_too_short;
   }
 
   // JSON chunk: length
   uint32_t json_length;
   memcpy(&json_length, json_chunk, 4);
   if (GlbHeaderSize + GlbChunkHeaderSize + json_length > size)
   {
      return cgltf_result_data_too_short;
   }
 
   // JSON chunk: magic
   memcpy(&tmp, json_chunk + 4, 4);
   if (tmp != GlbMagicJsonChunk)
   {
      return cgltf_result_unknown_format;
   }
 
   json_chunk += GlbChunkHeaderSize;
 
   const void* bin = 0;
   cgltf_size bin_size = 0;
 
   if (GlbHeaderSize + GlbChunkHeaderSize + json_length + GlbChunkHeaderSize <= size)
   {
      // We can read another chunk
      const uint8_t* bin_chunk = json_chunk + json_length;
 
      // Bin chunk: length
      uint32_t bin_length;
      memcpy(&bin_length, bin_chunk, 4);
      if (GlbHeaderSize + GlbChunkHeaderSize + json_length + GlbChunkHeaderSize + bin_length > size)
      {
         return cgltf_result_data_too_short;
      }
 
      // Bin chunk: magic
      memcpy(&tmp, bin_chunk + 4, 4);
      if (tmp != GlbMagicBinChunk)
      {
         return cgltf_result_unknown_format;
      }
 
      bin_chunk += GlbChunkHeaderSize;
 
      bin = bin_chunk;
      bin_size = bin_length;
   }
 
   cgltf_result json_result = cgltf_parse_json(&fixed_options, json_chunk, json_length, out_data);
   if (json_result != cgltf_result_success)
   {
      return json_result;
   }
 
   (*out_data)->file_type = cgltf_file_type_glb;
   (*out_data)->bin = bin;
   (*out_data)->bin_size = bin_size;
 
   return cgltf_result_success;
}
 
cgltf_result cgltf_parse_file(const cgltf_options* options, const char* path, cgltf_data** out_data)
{
   if (options == NULL)
   {
      return cgltf_result_invalid_options;
   }
 
   cgltf_result (*file_read)(const struct cgltf_memory_options*, const struct cgltf_file_options*, const char*, cgltf_size*, void**) = options->file.read ? options->file.read : &cgltf_default_file_read;
   void (*file_release)(const struct cgltf_memory_options*, const struct cgltf_file_options*, void* data) = options->file.release ? options->file.release : cgltf_default_file_release;
 
   void* file_data = NULL;
   cgltf_size file_size = 0;
   cgltf_result result = file_read(&options->memory, &options->file, path, &file_size, &file_data);
   if (result != cgltf_result_success)
   {
      return result;
   }
 
   result = cgltf_parse(options, file_data, file_size, out_data);
 
   if (result != cgltf_result_success)
   {
      file_release(&options->memory, &options->file, file_data);
      return result;
   }
 
   (*out_data)->file_data = file_data;
 
   return cgltf_result_success;
}
 
static void cgltf_combine_paths(char* path, const char* base, const char* uri)
{
   const char* s0 = strrchr(base, '/');
   const char* s1 = strrchr(base, '\\');
   const char* slash = s0 ? (s1 && s1 > s0 ? s1 : s0) : s1;
 
   if (slash)
   {
      size_t prefix = slash - base + 1;
 
      strncpy(path, base, prefix);
      strcpy(path + prefix, uri);
   }
   else
   {
      strcpy(path, uri);
   }
}
 
static cgltf_result cgltf_load_buffer_file(const cgltf_options* options, cgltf_size size, const char* uri, const char* gltf_path, void** out_data)
{
   void* (*memory_alloc)(void*, cgltf_size) = options->memory.alloc_func ? options->memory.alloc_func : &cgltf_default_alloc;
   void (*memory_free)(void*, void*) = options->memory.free_func ? options->memory.free_func : &cgltf_default_free;
   cgltf_result (*file_read)(const struct cgltf_memory_options*, const struct cgltf_file_options*, const char*, cgltf_size*, void**) = options->file.read ? options->file.read : &cgltf_default_file_read;
 
   char* path = (char*)memory_alloc(options->memory.user_data, strlen(uri) + strlen(gltf_path) + 1);
   if (!path)
   {
      return cgltf_result_out_of_memory;
   }
 
   cgltf_combine_paths(path, gltf_path, uri);
 
   // after combining, the tail of the resulting path is a uri; decode_uri converts it into path
   cgltf_decode_uri(path + strlen(path) - strlen(uri));
 
   void* file_data = NULL;
   cgltf_result result = file_read(&options->memory, &options->file, path, &size, &file_data);
 
   memory_free(options->memory.user_data, path);
 
   *out_data = (result == cgltf_result_success) ? file_data : NULL;
 
   return result;
}
 
cgltf_result cgltf_load_buffer_base64(const cgltf_options* options, cgltf_size size, const char* base64, void** out_data)
{
   void* (*memory_alloc)(void*, cgltf_size) = options->memory.alloc_func ? options->memory.alloc_func : &cgltf_default_alloc;
   void (*memory_free)(void*, void*) = options->memory.free_func ? options->memory.free_func : &cgltf_default_free;
 
   unsigned char* data = (unsigned char*)memory_alloc(options->memory.user_data, size);
   if (!data)
   {
      return cgltf_result_out_of_memory;
   }
 
   unsigned int buffer = 0;
   unsigned int buffer_bits = 0;
 
   for (cgltf_size i = 0; i < size; ++i)
   {
      while (buffer_bits < 8)
      {
         char ch = *base64++;
 
         int index =
            (unsigned)(ch - 'A') < 26 ? (ch - 'A') :
            (unsigned)(ch - 'a') < 26 ? (ch - 'a') + 26 :
            (unsigned)(ch - '0') < 10 ? (ch - '0') + 52 :
            ch == '+' ? 62 :
            ch == '/' ? 63 :
            -1;
 
         if (index < 0)
         {
            memory_free(options->memory.user_data, data);
            return cgltf_result_io_error;
         }
 
         buffer = (buffer << 6) | index;
         buffer_bits += 6;
      }
 
      data[i] = (unsigned char)(buffer >> (buffer_bits - 8));
      buffer_bits -= 8;
   }
 
   *out_data = data;
 
   return cgltf_result_success;
}
 
static int cgltf_unhex(char ch)
{
   return
      (unsigned)(ch - '0') < 10 ? (ch - '0') :
      (unsigned)(ch - 'A') < 6 ? (ch - 'A') + 10 :
      (unsigned)(ch - 'a') < 6 ? (ch - 'a') + 10 :
      -1;
}
 
cgltf_size cgltf_decode_string(char* string)
{
   char* read = string + strcspn(string, "\\");
   if (*read == 0)
   {
      return read - string;
   }
   char* write = string;
   char* last = string;
 
   for (;;)
   {
      // Copy characters since last escaped sequence
      cgltf_size written = read - last;
      memmove(write, last, written);
      write += written;
 
      if (*read++ == 0)
      {
         break;
      }
 
      // jsmn already checked that all escape sequences are valid
      switch (*read++)
      {
      case '\"': *write++ = '\"'; break;
      case '/':  *write++ = '/';  break;
      case '\\': *write++ = '\\'; break;
      case 'b':  *write++ = '\b'; break;
      case 'f':  *write++ = '\f'; break;
      case 'r':  *write++ = '\r'; break;
      case 'n':  *write++ = '\n'; break;
      case 't':  *write++ = '\t'; break;
      case 'u':
      {
         // UCS-2 codepoint \uXXXX to UTF-8
         int character = 0;
         for (cgltf_size i = 0; i < 4; ++i)
         {
            character = (character << 4) + cgltf_unhex(*read++);
         }
 
         if (character <= 0x7F)
         {
            *write++ = character & 0xFF;
         }
         else if (character <= 0x7FF)
         {
            *write++ = 0xC0 | ((character >> 6) & 0xFF);
            *write++ = 0x80 | (character & 0x3F);
         }
         else
         {
            *write++ = 0xE0 | ((character >> 12) & 0xFF);
            *write++ = 0x80 | ((character >> 6) & 0x3F);
            *write++ = 0x80 | (character & 0x3F);
         }
         break;
      }
      default:
         break;
      }
 
      last = read;
      read += strcspn(read, "\\");
   }
 
   *write = 0;
   return write - string;
}
 
cgltf_size cgltf_decode_uri(char* uri)
{
   char* write = uri;
   char* i = uri;
 
   while (*i)
   {
      if (*i == '%')
      {
         int ch1 = cgltf_unhex(i[1]);
 
         if (ch1 >= 0)
         {
            int ch2 = cgltf_unhex(i[2]);
 
            if (ch2 >= 0)
            {
               *write++ = (char)(ch1 * 16 + ch2);
               i += 3;
               continue;
            }
         }
      }
 
      *write++ = *i++;
   }
 
   *write = 0;
   return write - uri;
}
 
cgltf_result cgltf_load_buffers(const cgltf_options* options, cgltf_data* data, const char* gltf_path)
{
   if (options == NULL)
   {
      return cgltf_result_invalid_options;
   }
 
   if (data->buffers_count && data->buffers[0].data == NULL && data->buffers[0].uri == NULL && data->bin)
   {
      if (data->bin_size < data->buffers[0].size)
      {
         return cgltf_result_data_too_short;
      }
 
      data->buffers[0].data = (void*)data->bin;
      data->buffers[0].data_free_method = cgltf_data_free_method_none;
   }
 
   for (cgltf_size i = 0; i < data->buffers_count; ++i)
   {
      if (data->buffers[i].data)
      {
         continue;
      }
 
      const char* uri = data->buffers[i].uri;
 
      if (uri == NULL)
      {
         continue;
      }
 
      if (strncmp(uri, "data:", 5) == 0)
      {
         const char* comma = strchr(uri, ',');
 
         if (comma && comma - uri >= 7 && strncmp(comma - 7, ";base64", 7) == 0)
         {
            cgltf_result res = cgltf_load_buffer_base64(options, data->buffers[i].size, comma + 1, &data->buffers[i].data);
            data->buffers[i].data_free_method = cgltf_data_free_method_memory_free;
 
            if (res != cgltf_result_success)
            {
               return res;
            }
         }
         else
         {
            return cgltf_result_unknown_format;
         }
      }
      else if (strstr(uri, "://") == NULL && gltf_path)
      {
         cgltf_result res = cgltf_load_buffer_file(options, data->buffers[i].size, uri, gltf_path, &data->buffers[i].data);
         data->buffers[i].data_free_method = cgltf_data_free_method_file_release;
 
         if (res != cgltf_result_success)
         {
            return res;
         }
      }
      else
      {
         return cgltf_result_unknown_format;
      }
   }
 
   return cgltf_result_success;
}
 
static cgltf_size cgltf_calc_size(cgltf_type type, cgltf_component_type component_type);
 
static cgltf_size cgltf_calc_index_bound(cgltf_buffer_view* buffer_view, cgltf_size offset, cgltf_component_type component_type, cgltf_size count)
{
   char* data = (char*)buffer_view->buffer->data + offset + buffer_view->offset;
   cgltf_size bound = 0;
 
   switch (component_type)
   {
   case cgltf_component_type_r_8u:
      for (size_t i = 0; i < count; ++i)
      {
         cgltf_size v = ((unsigned char*)data)[i];
         bound = bound > v ? bound : v;
      }
      break;
 
   case cgltf_component_type_r_16u:
      for (size_t i = 0; i < count; ++i)
      {
         cgltf_size v = ((unsigned short*)data)[i];
         bound = bound > v ? bound : v;
      }
      break;
 
   case cgltf_component_type_r_32u:
      for (size_t i = 0; i < count; ++i)
      {
         cgltf_size v = ((unsigned int*)data)[i];
         bound = bound > v ? bound : v;
      }
      break;
 
   default:
      ;
   }
 
   return bound;
}
 
#if CGLTF_VALIDATE_ENABLE_ASSERTS
#define CGLTF_ASSERT_IF(cond, result) assert(!(cond)); if (cond) return result;
#else
#define CGLTF_ASSERT_IF(cond, result) if (cond) return result;
#endif
 
cgltf_result cgltf_validate(cgltf_data* data)
{
   for (cgltf_size i = 0; i < data->accessors_count; ++i)
   {
      cgltf_accessor* accessor = &data->accessors[i];
 
      cgltf_size element_size = cgltf_calc_size(accessor->type, accessor->component_type);
 
      if (accessor->buffer_view)
      {
         cgltf_size req_size = accessor->offset + accessor->stride * (accessor->count - 1) + element_size;
 
         CGLTF_ASSERT_IF(accessor->buffer_view->size < req_size, cgltf_result_data_too_short);
      }
 
      if (accessor->is_sparse)
      {
         cgltf_accessor_sparse* sparse = &accessor->sparse;
 
         cgltf_size indices_component_size = cgltf_calc_size(cgltf_type_scalar, sparse->indices_component_type);
         cgltf_size indices_req_size = sparse->indices_byte_offset + indices_component_size * sparse->count;
         cgltf_size values_req_size = sparse->values_byte_offset + element_size * sparse->count;
 
         CGLTF_ASSERT_IF(sparse->indices_buffer_view->size < indices_req_size ||
                     sparse->values_buffer_view->size < values_req_size, cgltf_result_data_too_short);
 
         CGLTF_ASSERT_IF(sparse->indices_component_type != cgltf_component_type_r_8u &&
                     sparse->indices_component_type != cgltf_component_type_r_16u &&
                     sparse->indices_component_type != cgltf_component_type_r_32u, cgltf_result_invalid_gltf);
 
         if (sparse->indices_buffer_view->buffer->data)
         {
            cgltf_size index_bound = cgltf_calc_index_bound(sparse->indices_buffer_view, sparse->indices_byte_offset, sparse->indices_component_type, sparse->count);
 
            CGLTF_ASSERT_IF(index_bound >= accessor->count, cgltf_result_data_too_short);
         }
      }
   }
 
   for (cgltf_size i = 0; i < data->buffer_views_count; ++i)
   {
      cgltf_size req_size = data->buffer_views[i].offset + data->buffer_views[i].size;
 
      CGLTF_ASSERT_IF(data->buffer_views[i].buffer && data->buffer_views[i].buffer->size < req_size, cgltf_result_data_too_short);
 
      if (data->buffer_views[i].has_meshopt_compression)
      {
         cgltf_meshopt_compression* mc = &data->buffer_views[i].meshopt_compression;
 
         CGLTF_ASSERT_IF(mc->buffer == NULL || mc->buffer->size < mc->offset + mc->size, cgltf_result_data_too_short);
 
         CGLTF_ASSERT_IF(data->buffer_views[i].stride && mc->stride != data->buffer_views[i].stride, cgltf_result_invalid_gltf);
 
         CGLTF_ASSERT_IF(data->buffer_views[i].size != mc->stride * mc->count, cgltf_result_invalid_gltf);
 
         CGLTF_ASSERT_IF(mc->mode == cgltf_meshopt_compression_mode_invalid, cgltf_result_invalid_gltf);
 
         CGLTF_ASSERT_IF(mc->mode == cgltf_meshopt_compression_mode_attributes && !(mc->stride % 4 == 0 && mc->stride <= 256), cgltf_result_invalid_gltf);
 
         CGLTF_ASSERT_IF(mc->mode == cgltf_meshopt_compression_mode_triangles && mc->count % 3 != 0, cgltf_result_invalid_gltf);
 
         CGLTF_ASSERT_IF((mc->mode == cgltf_meshopt_compression_mode_triangles || mc->mode == cgltf_meshopt_compression_mode_indices) && mc->stride != 2 && mc->stride != 4, cgltf_result_invalid_gltf);
 
         CGLTF_ASSERT_IF((mc->mode == cgltf_meshopt_compression_mode_triangles || mc->mode == cgltf_meshopt_compression_mode_indices) && mc->filter != cgltf_meshopt_compression_filter_none, cgltf_result_invalid_gltf);
 
         CGLTF_ASSERT_IF(mc->filter == cgltf_meshopt_compression_filter_octahedral && mc->stride != 4 && mc->stride != 8, cgltf_result_invalid_gltf);
 
         CGLTF_ASSERT_IF(mc->filter == cgltf_meshopt_compression_filter_quaternion && mc->stride != 8, cgltf_result_invalid_gltf);
      }
   }
 
   for (cgltf_size i = 0; i < data->meshes_count; ++i)
   {
      if (data->meshes[i].weights)
      {
         CGLTF_ASSERT_IF(data->meshes[i].primitives_count && data->meshes[i].primitives[0].targets_count != data->meshes[i].weights_count, cgltf_result_invalid_gltf);
      }
 
      if (data->meshes[i].target_names)
      {
         CGLTF_ASSERT_IF(data->meshes[i].primitives_count && data->meshes[i].primitives[0].targets_count != data->meshes[i].target_names_count, cgltf_result_invalid_gltf);
      }
 
      for (cgltf_size j = 0; j < data->meshes[i].primitives_count; ++j)
      {
         CGLTF_ASSERT_IF(data->meshes[i].primitives[j].targets_count != data->meshes[i].primitives[0].targets_count, cgltf_result_invalid_gltf);
 
         if (data->meshes[i].primitives[j].attributes_count)
         {
            cgltf_accessor* first = data->meshes[i].primitives[j].attributes[0].data;
 
            for (cgltf_size k = 0; k < data->meshes[i].primitives[j].attributes_count; ++k)
            {
               CGLTF_ASSERT_IF(data->meshes[i].primitives[j].attributes[k].data->count != first->count, cgltf_result_invalid_gltf);
            }
 
            for (cgltf_size k = 0; k < data->meshes[i].primitives[j].targets_count; ++k)
            {
               for (cgltf_size m = 0; m < data->meshes[i].primitives[j].targets[k].attributes_count; ++m)
               {
                  CGLTF_ASSERT_IF(data->meshes[i].primitives[j].targets[k].attributes[m].data->count != first->count, cgltf_result_invalid_gltf);
               }
            }
 
            cgltf_accessor* indices = data->meshes[i].primitives[j].indices;
 
            CGLTF_ASSERT_IF(indices &&
               indices->component_type != cgltf_component_type_r_8u &&
               indices->component_type != cgltf_component_type_r_16u &&
               indices->component_type != cgltf_component_type_r_32u, cgltf_result_invalid_gltf);
 
            if (indices && indices->buffer_view && indices->buffer_view->buffer->data)
            {
               cgltf_size index_bound = cgltf_calc_index_bound(indices->buffer_view, indices->offset, indices->component_type, indices->count);
 
               CGLTF_ASSERT_IF(index_bound >= first->count, cgltf_result_data_too_short);
            }
 
            for (cgltf_size k = 0; k < data->meshes[i].primitives[j].mappings_count; ++k)
            {
               CGLTF_ASSERT_IF(data->meshes[i].primitives[j].mappings[k].variant >= data->variants_count, cgltf_result_invalid_gltf);
            }
         }
      }
   }
 
   for (cgltf_size i = 0; i < data->nodes_count; ++i)
   {
      if (data->nodes[i].weights && data->nodes[i].mesh)
      {
         CGLTF_ASSERT_IF (data->nodes[i].mesh->primitives_count && data->nodes[i].mesh->primitives[0].targets_count != data->nodes[i].weights_count, cgltf_result_invalid_gltf);
      }
   }
 
   for (cgltf_size i = 0; i < data->nodes_count; ++i)
   {
      cgltf_node* p1 = data->nodes[i].parent;
      cgltf_node* p2 = p1 ? p1->parent : NULL;
 
      while (p1 && p2)
      {
         CGLTF_ASSERT_IF(p1 == p2, cgltf_result_invalid_gltf);
 
         p1 = p1->parent;
         p2 = p2->parent ? p2->parent->parent : NULL;
      }
   }
 
   for (cgltf_size i = 0; i < data->scenes_count; ++i)
   {
      for (cgltf_size j = 0; j < data->scenes[i].nodes_count; ++j)
      {
         CGLTF_ASSERT_IF(data->scenes[i].nodes[j]->parent, cgltf_result_invalid_gltf);
      }
   }
 
   for (cgltf_size i = 0; i < data->animations_count; ++i)
   {
      for (cgltf_size j = 0; j < data->animations[i].channels_count; ++j)
      {
         cgltf_animation_channel* channel = &data->animations[i].channels[j];
 
         if (!channel->target_node)
         {
            continue;
         }
 
         cgltf_size components = 1;
 
         if (channel->target_path == cgltf_animation_path_type_weights)
         {
            CGLTF_ASSERT_IF(!channel->target_node->mesh || !channel->target_node->mesh->primitives_count, cgltf_result_invalid_gltf);
 
            components = channel->target_node->mesh->primitives[0].targets_count;
         }
 
         cgltf_size values = channel->sampler->interpolation == cgltf_interpolation_type_cubic_spline ? 3 : 1;
 
         CGLTF_ASSERT_IF(channel->sampler->input->count * components * values != channel->sampler->output->count, cgltf_result_data_too_short);
      }
   }
 
   return cgltf_result_success;
}
 
cgltf_result cgltf_copy_extras_json(const cgltf_data* data, const cgltf_extras* extras, char* dest, cgltf_size* dest_size)
{
   cgltf_size json_size = extras->end_offset - extras->start_offset;
 
   if (!dest)
   {
      if (dest_size)
      {
         *dest_size = json_size + 1;
         return cgltf_result_success;
      }
      return cgltf_result_invalid_options;
   }
 
   if (*dest_size + 1 < json_size)
   {
      strncpy(dest, data->json + extras->start_offset, *dest_size - 1);
      dest[*dest_size - 1] = 0;
   }
   else
   {
      strncpy(dest, data->json + extras->start_offset, json_size);
      dest[json_size] = 0;
   }
 
   return cgltf_result_success;
}
 
void cgltf_free_extensions(cgltf_data* data, cgltf_extension* extensions, cgltf_size extensions_count)
{
   for (cgltf_size i = 0; i < extensions_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, extensions[i].name);
      data->memory.free_func(data->memory.user_data, extensions[i].data);
   }
   data->memory.free_func(data->memory.user_data, extensions);
}
 
void cgltf_free(cgltf_data* data)
{
   if (!data)
   {
      return;
   }
 
   void (*file_release)(const struct cgltf_memory_options*, const struct cgltf_file_options*, void* data) = data->file.release ? data->file.release : cgltf_default_file_release;
 
   data->memory.free_func(data->memory.user_data, data->asset.copyright);
   data->memory.free_func(data->memory.user_data, data->asset.generator);
   data->memory.free_func(data->memory.user_data, data->asset.version);
   data->memory.free_func(data->memory.user_data, data->asset.min_version);
 
   cgltf_free_extensions(data, data->asset.extensions, data->asset.extensions_count);
 
   for (cgltf_size i = 0; i < data->accessors_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->accessors[i].name);
 
      if(data->accessors[i].is_sparse)
      {
         cgltf_free_extensions(data, data->accessors[i].sparse.extensions, data->accessors[i].sparse.extensions_count);
         cgltf_free_extensions(data, data->accessors[i].sparse.indices_extensions, data->accessors[i].sparse.indices_extensions_count);
         cgltf_free_extensions(data, data->accessors[i].sparse.values_extensions, data->accessors[i].sparse.values_extensions_count);
      }
      cgltf_free_extensions(data, data->accessors[i].extensions, data->accessors[i].extensions_count);
   }
   data->memory.free_func(data->memory.user_data, data->accessors);
 
   for (cgltf_size i = 0; i < data->buffer_views_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->buffer_views[i].name);
      data->memory.free_func(data->memory.user_data, data->buffer_views[i].data);
 
      cgltf_free_extensions(data, data->buffer_views[i].extensions, data->buffer_views[i].extensions_count);
   }
   data->memory.free_func(data->memory.user_data, data->buffer_views);
 
   for (cgltf_size i = 0; i < data->buffers_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->buffers[i].name);
 
      if (data->buffers[i].data_free_method == cgltf_data_free_method_file_release)
      {
         file_release(&data->memory, &data->file, data->buffers[i].data);
      }
      else if (data->buffers[i].data_free_method == cgltf_data_free_method_memory_free)
      {
         data->memory.free_func(data->memory.user_data, data->buffers[i].data);
      }
 
      data->memory.free_func(data->memory.user_data, data->buffers[i].uri);
 
      cgltf_free_extensions(data, data->buffers[i].extensions, data->buffers[i].extensions_count);
   }
 
   data->memory.free_func(data->memory.user_data, data->buffers);
 
   for (cgltf_size i = 0; i < data->meshes_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->meshes[i].name);
 
      for (cgltf_size j = 0; j < data->meshes[i].primitives_count; ++j)
      {
         for (cgltf_size k = 0; k < data->meshes[i].primitives[j].attributes_count; ++k)
         {
            data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].attributes[k].name);
         }
 
         data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].attributes);
 
         for (cgltf_size k = 0; k < data->meshes[i].primitives[j].targets_count; ++k)
         {
            for (cgltf_size m = 0; m < data->meshes[i].primitives[j].targets[k].attributes_count; ++m)
            {
               data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].targets[k].attributes[m].name);
            }
 
            data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].targets[k].attributes);
         }
 
         data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].targets);
 
         if (data->meshes[i].primitives[j].has_draco_mesh_compression)
         {
            for (cgltf_size k = 0; k < data->meshes[i].primitives[j].draco_mesh_compression.attributes_count; ++k)
            {
               data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].draco_mesh_compression.attributes[k].name);
            }
 
            data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].draco_mesh_compression.attributes);
         }
 
         data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].mappings);
 
         cgltf_free_extensions(data, data->meshes[i].primitives[j].extensions, data->meshes[i].primitives[j].extensions_count);
      }
 
      data->memory.free_func(data->memory.user_data, data->meshes[i].primitives);
      data->memory.free_func(data->memory.user_data, data->meshes[i].weights);
 
      for (cgltf_size j = 0; j < data->meshes[i].target_names_count; ++j)
      {
         data->memory.free_func(data->memory.user_data, data->meshes[i].target_names[j]);
      }
 
      cgltf_free_extensions(data, data->meshes[i].extensions, data->meshes[i].extensions_count);
 
      data->memory.free_func(data->memory.user_data, data->meshes[i].target_names);
   }
 
   data->memory.free_func(data->memory.user_data, data->meshes);
 
   for (cgltf_size i = 0; i < data->materials_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->materials[i].name);
 
      if(data->materials[i].has_pbr_metallic_roughness)
      {
         cgltf_free_extensions(data, data->materials[i].pbr_metallic_roughness.metallic_roughness_texture.extensions, data->materials[i].pbr_metallic_roughness.metallic_roughness_texture.extensions_count);
         cgltf_free_extensions(data, data->materials[i].pbr_metallic_roughness.base_color_texture.extensions, data->materials[i].pbr_metallic_roughness.base_color_texture.extensions_count);
      }
      if(data->materials[i].has_pbr_specular_glossiness)
      {
         cgltf_free_extensions(data, data->materials[i].pbr_specular_glossiness.diffuse_texture.extensions, data->materials[i].pbr_specular_glossiness.diffuse_texture.extensions_count);
         cgltf_free_extensions(data, data->materials[i].pbr_specular_glossiness.specular_glossiness_texture.extensions, data->materials[i].pbr_specular_glossiness.specular_glossiness_texture.extensions_count);
      }
      if(data->materials[i].has_clearcoat)
      {
         cgltf_free_extensions(data, data->materials[i].clearcoat.clearcoat_texture.extensions, data->materials[i].clearcoat.clearcoat_texture.extensions_count);
         cgltf_free_extensions(data, data->materials[i].clearcoat.clearcoat_roughness_texture.extensions, data->materials[i].clearcoat.clearcoat_roughness_texture.extensions_count);
         cgltf_free_extensions(data, data->materials[i].clearcoat.clearcoat_normal_texture.extensions, data->materials[i].clearcoat.clearcoat_normal_texture.extensions_count);
      }
      if(data->materials[i].has_specular)
      {
         cgltf_free_extensions(data, data->materials[i].specular.specular_texture.extensions, data->materials[i].specular.specular_texture.extensions_count);
         cgltf_free_extensions(data, data->materials[i].specular.specular_color_texture.extensions, data->materials[i].specular.specular_color_texture.extensions_count);
      }
      if(data->materials[i].has_transmission)
      {
         cgltf_free_extensions(data, data->materials[i].transmission.transmission_texture.extensions, data->materials[i].transmission.transmission_texture.extensions_count);
      }
      if (data->materials[i].has_volume)
      {
         cgltf_free_extensions(data, data->materials[i].volume.thickness_texture.extensions, data->materials[i].volume.thickness_texture.extensions_count);
      }
      if(data->materials[i].has_sheen)
      {
         cgltf_free_extensions(data, data->materials[i].sheen.sheen_color_texture.extensions, data->materials[i].sheen.sheen_color_texture.extensions_count);
         cgltf_free_extensions(data, data->materials[i].sheen.sheen_roughness_texture.extensions, data->materials[i].sheen.sheen_roughness_texture.extensions_count);
      }
      if(data->materials[i].has_iridescence)
      {
         cgltf_free_extensions(data, data->materials[i].iridescence.iridescence_texture.extensions, data->materials[i].iridescence.iridescence_texture.extensions_count);
         cgltf_free_extensions(data, data->materials[i].iridescence.iridescence_thickness_texture.extensions, data->materials[i].iridescence.iridescence_thickness_texture.extensions_count);
      }
 
      cgltf_free_extensions(data, data->materials[i].normal_texture.extensions, data->materials[i].normal_texture.extensions_count);
      cgltf_free_extensions(data, data->materials[i].occlusion_texture.extensions, data->materials[i].occlusion_texture.extensions_count);
      cgltf_free_extensions(data, data->materials[i].emissive_texture.extensions, data->materials[i].emissive_texture.extensions_count);
 
      cgltf_free_extensions(data, data->materials[i].extensions, data->materials[i].extensions_count);
   }
 
   data->memory.free_func(data->memory.user_data, data->materials);
 
   for (cgltf_size i = 0; i < data->images_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->images[i].name);
      data->memory.free_func(data->memory.user_data, data->images[i].uri);
      data->memory.free_func(data->memory.user_data, data->images[i].mime_type);
 
      cgltf_free_extensions(data, data->images[i].extensions, data->images[i].extensions_count);
   }
 
   data->memory.free_func(data->memory.user_data, data->images);
 
   for (cgltf_size i = 0; i < data->textures_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->textures[i].name);
      cgltf_free_extensions(data, data->textures[i].extensions, data->textures[i].extensions_count);
   }
 
   data->memory.free_func(data->memory.user_data, data->textures);
 
   for (cgltf_size i = 0; i < data->samplers_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->samplers[i].name);
      cgltf_free_extensions(data, data->samplers[i].extensions, data->samplers[i].extensions_count);
   }
 
   data->memory.free_func(data->memory.user_data, data->samplers);
 
   for (cgltf_size i = 0; i < data->skins_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->skins[i].name);
      data->memory.free_func(data->memory.user_data, data->skins[i].joints);
 
      cgltf_free_extensions(data, data->skins[i].extensions, data->skins[i].extensions_count);
   }
 
   data->memory.free_func(data->memory.user_data, data->skins);
 
   for (cgltf_size i = 0; i < data->cameras_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->cameras[i].name);
      cgltf_free_extensions(data, data->cameras[i].extensions, data->cameras[i].extensions_count);
   }
 
   data->memory.free_func(data->memory.user_data, data->cameras);
 
   for (cgltf_size i = 0; i < data->lights_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->lights[i].name);
   }
 
   data->memory.free_func(data->memory.user_data, data->lights);
 
   for (cgltf_size i = 0; i < data->nodes_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->nodes[i].name);
      data->memory.free_func(data->memory.user_data, data->nodes[i].children);
      data->memory.free_func(data->memory.user_data, data->nodes[i].weights);
      cgltf_free_extensions(data, data->nodes[i].extensions, data->nodes[i].extensions_count);
   }
 
   data->memory.free_func(data->memory.user_data, data->nodes);
 
   for (cgltf_size i = 0; i < data->scenes_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->scenes[i].name);
      data->memory.free_func(data->memory.user_data, data->scenes[i].nodes);
 
      cgltf_free_extensions(data, data->scenes[i].extensions, data->scenes[i].extensions_count);
   }
 
   data->memory.free_func(data->memory.user_data, data->scenes);
 
   for (cgltf_size i = 0; i < data->animations_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->animations[i].name);
      for (cgltf_size j = 0; j <  data->animations[i].samplers_count; ++j)
      {
         cgltf_free_extensions(data, data->animations[i].samplers[j].extensions, data->animations[i].samplers[j].extensions_count);
      }
      data->memory.free_func(data->memory.user_data, data->animations[i].samplers);
 
      for (cgltf_size j = 0; j <  data->animations[i].channels_count; ++j)
      {
         cgltf_free_extensions(data, data->animations[i].channels[j].extensions, data->animations[i].channels[j].extensions_count);
      }
      data->memory.free_func(data->memory.user_data, data->animations[i].channels);
 
      cgltf_free_extensions(data, data->animations[i].extensions, data->animations[i].extensions_count);
   }
 
   data->memory.free_func(data->memory.user_data, data->animations);
 
   for (cgltf_size i = 0; i < data->variants_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->variants[i].name);
   }
 
   data->memory.free_func(data->memory.user_data, data->variants);
 
   cgltf_free_extensions(data, data->data_extensions, data->data_extensions_count);
 
   for (cgltf_size i = 0; i < data->extensions_used_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->extensions_used[i]);
   }
 
   data->memory.free_func(data->memory.user_data, data->extensions_used);
 
   for (cgltf_size i = 0; i < data->extensions_required_count; ++i)
   {
      data->memory.free_func(data->memory.user_data, data->extensions_required[i]);
   }
 
   data->memory.free_func(data->memory.user_data, data->extensions_required);
 
   file_release(&data->memory, &data->file, data->file_data);
 
   data->memory.free_func(data->memory.user_data, data);
}
 
void cgltf_node_transform_local(const cgltf_node* node, cgltf_float* out_matrix)
{
   cgltf_float* lm = out_matrix;
 
   if (node->has_matrix)
   {
      memcpy(lm, node->matrix, sizeof(float) * 16);
   }
   else
   {
      float tx = node->translation[0];
      float ty = node->translation[1];
      float tz = node->translation[2];
 
      float qx = node->rotation[0];
      float qy = node->rotation[1];
      float qz = node->rotation[2];
      float qw = node->rotation[3];
 
      float sx = node->scale[0];
      float sy = node->scale[1];
      float sz = node->scale[2];
 
      lm[0] = (1 - 2 * qy*qy - 2 * qz*qz) * sx;
      lm[1] = (2 * qx*qy + 2 * qz*qw) * sx;
      lm[2] = (2 * qx*qz - 2 * qy*qw) * sx;
      lm[3] = 0.f;
 
      lm[4] = (2 * qx*qy - 2 * qz*qw) * sy;
      lm[5] = (1 - 2 * qx*qx - 2 * qz*qz) * sy;
      lm[6] = (2 * qy*qz + 2 * qx*qw) * sy;
      lm[7] = 0.f;
 
      lm[8] = (2 * qx*qz + 2 * qy*qw) * sz;
      lm[9] = (2 * qy*qz - 2 * qx*qw) * sz;
      lm[10] = (1 - 2 * qx*qx - 2 * qy*qy) * sz;
      lm[11] = 0.f;
 
      lm[12] = tx;
      lm[13] = ty;
      lm[14] = tz;
      lm[15] = 1.f;
   }
}
 
void cgltf_node_transform_world(const cgltf_node* node, cgltf_float* out_matrix)
{
   cgltf_float* lm = out_matrix;
   cgltf_node_transform_local(node, lm);
 
   const cgltf_node* parent = node->parent;
 
   while (parent)
   {
      float pm[16];
      cgltf_node_transform_local(parent, pm);
 
      for (int i = 0; i < 4; ++i)
      {
         float l0 = lm[i * 4 + 0];
         float l1 = lm[i * 4 + 1];
         float l2 = lm[i * 4 + 2];
 
         float r0 = l0 * pm[0] + l1 * pm[4] + l2 * pm[8];
         float r1 = l0 * pm[1] + l1 * pm[5] + l2 * pm[9];
         float r2 = l0 * pm[2] + l1 * pm[6] + l2 * pm[10];
 
         lm[i * 4 + 0] = r0;
         lm[i * 4 + 1] = r1;
         lm[i * 4 + 2] = r2;
      }
 
      lm[12] += pm[12];
      lm[13] += pm[13];
      lm[14] += pm[14];
 
      parent = parent->parent;
   }
}
 
static cgltf_ssize cgltf_component_read_integer(const void* in, cgltf_component_type component_type)
{
   switch (component_type)
   {
      case cgltf_component_type_r_16:
         return *((const int16_t*) in);
      case cgltf_component_type_r_16u:
         return *((const uint16_t*) in);
      case cgltf_component_type_r_32u:
         return *((const uint32_t*) in);
      case cgltf_component_type_r_32f:
         return (cgltf_ssize)*((const float*) in);
      case cgltf_component_type_r_8:
         return *((const int8_t*) in);
      case cgltf_component_type_r_8u:
         return *((const uint8_t*) in);
      default:
         return 0;
   }
}
 
static cgltf_size cgltf_component_read_index(const void* in, cgltf_component_type component_type)
{
   switch (component_type)
   {
      case cgltf_component_type_r_16u:
         return *((const uint16_t*) in);
      case cgltf_component_type_r_32u:
         return *((const uint32_t*) in);
      case cgltf_component_type_r_32f:
         return (cgltf_size)*((const float*) in);
      case cgltf_component_type_r_8u:
         return *((const uint8_t*) in);
      default:
         return 0;
   }
}
 
static cgltf_float cgltf_component_read_float(const void* in, cgltf_component_type component_type, cgltf_bool normalized)
{
   if (component_type == cgltf_component_type_r_32f)
   {
      return *((const float*) in);
   }
 
   if (normalized)
   {
      switch (component_type)
      {
         // note: glTF spec doesn't currently define normalized conversions for 32-bit integers
         case cgltf_component_type_r_16:
            return *((const int16_t*) in) / (cgltf_float)32767;
         case cgltf_component_type_r_16u:
            return *((const uint16_t*) in) / (cgltf_float)65535;
         case cgltf_component_type_r_8:
            return *((const int8_t*) in) / (cgltf_float)127;
         case cgltf_component_type_r_8u:
            return *((const uint8_t*) in) / (cgltf_float)255;
         default:
            return 0;
      }
   }
 
   return (cgltf_float)cgltf_component_read_integer(in, component_type);
}
 
static cgltf_size cgltf_component_size(cgltf_component_type component_type);
 
static cgltf_bool cgltf_element_read_float(const uint8_t* element, cgltf_type type, cgltf_component_type component_type, cgltf_bool normalized, cgltf_float* out, cgltf_size element_size)
{
   cgltf_size num_components = cgltf_num_components(type);
 
   if (element_size < num_components) {
      return 0;
   }
 
   // There are three special cases for component extraction, see #data-alignment in the 2.0 spec.
 
   cgltf_size component_size = cgltf_component_size(component_type);
 
   if (type == cgltf_type_mat2 && component_size == 1)
   {
      out[0] = cgltf_component_read_float(element, component_type, normalized);
      out[1] = cgltf_component_read_float(element + 1, component_type, normalized);
      out[2] = cgltf_component_read_float(element + 4, component_type, normalized);
      out[3] = cgltf_component_read_float(element + 5, component_type, normalized);
      return 1;
   }
 
   if (type == cgltf_type_mat3 && component_size == 1)
   {
      out[0] = cgltf_component_read_float(element, component_type, normalized);
      out[1] = cgltf_component_read_float(element + 1, component_type, normalized);
      out[2] = cgltf_component_read_float(element + 2, component_type, normalized);
      out[3] = cgltf_component_read_float(element + 4, component_type, normalized);
      out[4] = cgltf_component_read_float(element + 5, component_type, normalized);
      out[5] = cgltf_component_read_float(element + 6, component_type, normalized);
      out[6] = cgltf_component_read_float(element + 8, component_type, normalized);
      out[7] = cgltf_component_read_float(element + 9, component_type, normalized);
      out[8] = cgltf_component_read_float(element + 10, component_type, normalized);
      return 1;
   }
 
   if (type == cgltf_type_mat3 && component_size == 2)
   {
      out[0] = cgltf_component_read_float(element, component_type, normalized);
      out[1] = cgltf_component_read_float(element + 2, component_type, normalized);
      out[2] = cgltf_component_read_float(element + 4, component_type, normalized);
      out[3] = cgltf_component_read_float(element + 8, component_type, normalized);
      out[4] = cgltf_component_read_float(element + 10, component_type, normalized);
      out[5] = cgltf_component_read_float(element + 12, component_type, normalized);
      out[6] = cgltf_component_read_float(element + 16, component_type, normalized);
      out[7] = cgltf_component_read_float(element + 18, component_type, normalized);
      out[8] = cgltf_component_read_float(element + 20, component_type, normalized);
      return 1;
   }
 
   for (cgltf_size i = 0; i < num_components; ++i)
   {
      out[i] = cgltf_component_read_float(element + component_size * i, component_type, normalized);
   }
   return 1;
}
 
const uint8_t* cgltf_buffer_view_data(const cgltf_buffer_view* view)
{
   if (view->data)
      return (const uint8_t*)view->data;
 
   if (!view->buffer->data)
      return NULL;
 
   const uint8_t* result = (const uint8_t*)view->buffer->data;
   result += view->offset;
   return result;
}
 
cgltf_bool cgltf_accessor_read_float(const cgltf_accessor* accessor, cgltf_size index, cgltf_float* out, cgltf_size element_size)
{
   if (accessor->is_sparse)
   {
      return 0;
   }
   if (accessor->buffer_view == NULL)
   {
      memset(out, 0, element_size * sizeof(cgltf_float));
      return 1;
   }
   const uint8_t* element = cgltf_buffer_view_data(accessor->buffer_view);
   if (element == NULL)
   {
      return 0;
   }
   element += accessor->offset + accessor->stride * index;
   return cgltf_element_read_float(element, accessor->type, accessor->component_type, accessor->normalized, out, element_size);
}
 
cgltf_size cgltf_accessor_unpack_floats(const cgltf_accessor* accessor, cgltf_float* out, cgltf_size float_count)
{
   cgltf_size floats_per_element = cgltf_num_components(accessor->type);
   cgltf_size available_floats = accessor->count * floats_per_element;
   if (out == NULL)
   {
      return available_floats;
   }
 
   float_count = available_floats < float_count ? available_floats : float_count;
   cgltf_size element_count = float_count / floats_per_element;
 
   // First pass: convert each element in the base accessor.
   cgltf_float* dest = out;
   cgltf_accessor dense = *accessor;
   dense.is_sparse = 0;
   for (cgltf_size index = 0; index < element_count; index++, dest += floats_per_element)
   {
      if (!cgltf_accessor_read_float(&dense, index, dest, floats_per_element))
      {
         return 0;
      }
   }
 
   // Second pass: write out each element in the sparse accessor.
   if (accessor->is_sparse)
   {
      const cgltf_accessor_sparse* sparse = &dense.sparse;
 
      const uint8_t* index_data = cgltf_buffer_view_data(sparse->indices_buffer_view);
      const uint8_t* reader_head = cgltf_buffer_view_data(sparse->values_buffer_view);
 
      if (index_data == NULL || reader_head == NULL)
      {
         return 0;
      }
 
      index_data += sparse->indices_byte_offset;
      reader_head += sparse->values_byte_offset;
 
      cgltf_size index_stride = cgltf_component_size(sparse->indices_component_type);
      for (cgltf_size reader_index = 0; reader_index < sparse->count; reader_index++, index_data += index_stride)
      {
         size_t writer_index = cgltf_component_read_index(index_data, sparse->indices_component_type);
         float* writer_head = out + writer_index * floats_per_element;
 
         if (!cgltf_element_read_float(reader_head, dense.type, dense.component_type, dense.normalized, writer_head, floats_per_element))
         {
            return 0;
         }
 
         reader_head += dense.stride;
      }
   }
 
   return element_count * floats_per_element;
}
 
static cgltf_uint cgltf_component_read_uint(const void* in, cgltf_component_type component_type)
{
   switch (component_type)
   {
      case cgltf_component_type_r_8:
         return *((const int8_t*) in);
 
      case cgltf_component_type_r_8u:
         return *((const uint8_t*) in);
 
      case cgltf_component_type_r_16:
         return *((const int16_t*) in);
 
      case cgltf_component_type_r_16u:
         return *((const uint16_t*) in);
 
      case cgltf_component_type_r_32u:
         return *((const uint32_t*) in);
 
      default:
         return 0;
   }
}
 
static cgltf_bool cgltf_element_read_uint(const uint8_t* element, cgltf_type type, cgltf_component_type component_type, cgltf_uint* out, cgltf_size element_size)
{
   cgltf_size num_components = cgltf_num_components(type);
 
   if (element_size < num_components)
   {
      return 0;
   }
 
   // Reading integer matrices is not a valid use case
   if (type == cgltf_type_mat2 || type == cgltf_type_mat3 || type == cgltf_type_mat4)
   {
      return 0;
   }
 
   cgltf_size component_size = cgltf_component_size(component_type);
 
   for (cgltf_size i = 0; i < num_components; ++i)
   {
      out[i] = cgltf_component_read_uint(element + component_size * i, component_type);
   }
   return 1;
}
 
cgltf_bool cgltf_accessor_read_uint(const cgltf_accessor* accessor, cgltf_size index, cgltf_uint* out, cgltf_size element_size)
{
   if (accessor->is_sparse)
   {
      return 0;
   }
   if (accessor->buffer_view == NULL)
   {
      memset(out, 0, element_size * sizeof( cgltf_uint ));
      return 1;
   }
   const uint8_t* element = cgltf_buffer_view_data(accessor->buffer_view);
   if (element == NULL)
   {
      return 0;
   }
   element += accessor->offset + accessor->stride * index;
   return cgltf_element_read_uint(element, accessor->type, accessor->component_type, out, element_size);
}
 
cgltf_size cgltf_accessor_read_index(const cgltf_accessor* accessor, cgltf_size index)
{
   if (accessor->is_sparse)
   {
      return 0; // This is an error case, but we can't communicate the error with existing interface.
   }
   if (accessor->buffer_view == NULL)
   {
      return 0;
   }
   const uint8_t* element = cgltf_buffer_view_data(accessor->buffer_view);
   if (element == NULL)
   {
      return 0; // This is an error case, but we can't communicate the error with existing interface.
   }
   element += accessor->offset + accessor->stride * index;
   return cgltf_component_read_index(element, accessor->component_type);
}
 
#define CGLTF_ERROR_JSON -1
#define CGLTF_ERROR_NOMEM -2
#define CGLTF_ERROR_LEGACY -3
 
#define CGLTF_CHECK_TOKTYPE(tok_, type_) if ((tok_).type != (type_)) { return CGLTF_ERROR_JSON; }
#define CGLTF_CHECK_TOKTYPE_RETTYPE(tok_, type_, ret_) if ((tok_).type != (type_)) { return (ret_)CGLTF_ERROR_JSON; }
#define CGLTF_CHECK_KEY(tok_) if ((tok_).type != JSMN_STRING || (tok_).size == 0) { return CGLTF_ERROR_JSON; } /* checking size for 0 verifies that a value follows the key */
 
#define CGLTF_PTRINDEX(type, idx) (type*)((cgltf_size)idx + 1)
#define CGLTF_PTRFIXUP(var, data, size) if (var) { if ((cgltf_size)var > size) { return CGLTF_ERROR_JSON; } var = &data[(cgltf_size)var-1]; }
#define CGLTF_PTRFIXUP_REQ(var, data, size) if (!var || (cgltf_size)var > size) { return CGLTF_ERROR_JSON; } var = &data[(cgltf_size)var-1];
 
static int cgltf_json_strcmp(jsmntok_t const* tok, const uint8_t* json_chunk, const char* str)
{
   CGLTF_CHECK_TOKTYPE(*tok, JSMN_STRING);
   size_t const str_len = strlen(str);
   size_t const name_length = tok->end - tok->start;
   return (str_len == name_length) ? strncmp((const char*)json_chunk + tok->start, str, str_len) : 128;
}
 
static int cgltf_json_to_int(jsmntok_t const* tok, const uint8_t* json_chunk)
{
   CGLTF_CHECK_TOKTYPE(*tok, JSMN_PRIMITIVE);
   char tmp[128];
   int size = (cgltf_size)(tok->end - tok->start) < sizeof(tmp) ? tok->end - tok->start : (int)(sizeof(tmp) - 1);
   strncpy(tmp, (const char*)json_chunk + tok->start, size);
   tmp[size] = 0;
   return CGLTF_ATOI(tmp);
}
 
static cgltf_size cgltf_json_to_size(jsmntok_t const* tok, const uint8_t* json_chunk)
{
   CGLTF_CHECK_TOKTYPE_RETTYPE(*tok, JSMN_PRIMITIVE, cgltf_size);
   char tmp[128];
   int size = (cgltf_size)(tok->end - tok->start) < sizeof(tmp) ? tok->end - tok->start : (int)(sizeof(tmp) - 1);
   strncpy(tmp, (const char*)json_chunk + tok->start, size);
   tmp[size] = 0;
   return (cgltf_size)CGLTF_ATOLL(tmp);
}
 
static cgltf_float cgltf_json_to_float(jsmntok_t const* tok, const uint8_t* json_chunk)
{
   CGLTF_CHECK_TOKTYPE(*tok, JSMN_PRIMITIVE);
   char tmp[128];
   int size = (cgltf_size)(tok->end - tok->start) < sizeof(tmp) ? tok->end - tok->start : (int)(sizeof(tmp) - 1);
   strncpy(tmp, (const char*)json_chunk + tok->start, size);
   tmp[size] = 0;
   return (cgltf_float)CGLTF_ATOF(tmp);
}
 
static cgltf_bool cgltf_json_to_bool(jsmntok_t const* tok, const uint8_t* json_chunk)
{
   int size = tok->end - tok->start;
   return size == 4 && memcmp(json_chunk + tok->start, "true", 4) == 0;
}
 
static int cgltf_skip_json(jsmntok_t const* tokens, int i)
{
   int end = i + 1;
 
   while (i < end)
   {
      switch (tokens[i].type)
      {
      case JSMN_OBJECT:
         end += tokens[i].size * 2;
         break;
 
      case JSMN_ARRAY:
         end += tokens[i].size;
         break;
 
      case JSMN_PRIMITIVE:
      case JSMN_STRING:
         break;
 
      default:
         return -1;
      }
 
      i++;
   }
 
   return i;
}
 
static void cgltf_fill_float_array(float* out_array, int size, float value)
{
   for (int j = 0; j < size; ++j)
   {
      out_array[j] = value;
   }
}
 
static int cgltf_parse_json_float_array(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, float* out_array, int size)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
   if (tokens[i].size != size)
   {
      return CGLTF_ERROR_JSON;
   }
   ++i;
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
      out_array[j] = cgltf_json_to_float(tokens + i, json_chunk);
      ++i;
   }
   return i;
}
 
static int cgltf_parse_json_string(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, char** out_string)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_STRING);
   if (*out_string)
   {
      return CGLTF_ERROR_JSON;
   }
   int size = tokens[i].end - tokens[i].start;
   char* result = (char*)options->memory.alloc_func(options->memory.user_data, size + 1);
   if (!result)
   {
      return CGLTF_ERROR_NOMEM;
   }
   strncpy(result, (const char*)json_chunk + tokens[i].start, size);
   result[size] = 0;
   *out_string = result;
   return i + 1;
}
 
static int cgltf_parse_json_array(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, size_t element_size, void** out_array, cgltf_size* out_size)
{
   (void)json_chunk;
   if (tokens[i].type != JSMN_ARRAY)
   {
      return tokens[i].type == JSMN_OBJECT ? CGLTF_ERROR_LEGACY : CGLTF_ERROR_JSON;
   }
   if (*out_array)
   {
      return CGLTF_ERROR_JSON;
   }
   int size = tokens[i].size;
   void* result = cgltf_calloc(options, element_size, size);
   if (!result)
   {
      return CGLTF_ERROR_NOMEM;
   }
   *out_array = result;
   *out_size = size;
   return i + 1;
}
 
static int cgltf_parse_json_string_array(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, char*** out_array, cgltf_size* out_size)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(char*), (void**)out_array, out_size);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < *out_size; ++j)
   {
      i = cgltf_parse_json_string(options, tokens, i, json_chunk, j + (*out_array));
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static void cgltf_parse_attribute_type(const char* name, cgltf_attribute_type* out_type, int* out_index)
{
   if (*name == '_')
   {
      *out_type = cgltf_attribute_type_custom;
      return;
   }
 
   const char* us = strchr(name, '_');
   size_t len = us ? (size_t)(us - name) : strlen(name);
 
   if (len == 8 && strncmp(name, "POSITION", 8) == 0)
   {
      *out_type = cgltf_attribute_type_position;
   }
   else if (len == 6 && strncmp(name, "NORMAL", 6) == 0)
   {
      *out_type = cgltf_attribute_type_normal;
   }
   else if (len == 7 && strncmp(name, "TANGENT", 7) == 0)
   {
      *out_type = cgltf_attribute_type_tangent;
   }
   else if (len == 8 && strncmp(name, "TEXCOORD", 8) == 0)
   {
      *out_type = cgltf_attribute_type_texcoord;
   }
   else if (len == 5 && strncmp(name, "COLOR", 5) == 0)
   {
      *out_type = cgltf_attribute_type_color;
   }
   else if (len == 6 && strncmp(name, "JOINTS", 6) == 0)
   {
      *out_type = cgltf_attribute_type_joints;
   }
   else if (len == 7 && strncmp(name, "WEIGHTS", 7) == 0)
   {
      *out_type = cgltf_attribute_type_weights;
   }
   else
   {
      *out_type = cgltf_attribute_type_invalid;
   }
 
   if (us && *out_type != cgltf_attribute_type_invalid)
   {
      *out_index = CGLTF_ATOI(us + 1);
   }
}
 
static int cgltf_parse_json_attribute_list(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_attribute** out_attributes, cgltf_size* out_attributes_count)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   if (*out_attributes)
   {
      return CGLTF_ERROR_JSON;
   }
 
   *out_attributes_count = tokens[i].size;
   *out_attributes = (cgltf_attribute*)cgltf_calloc(options, sizeof(cgltf_attribute), *out_attributes_count);
   ++i;
 
   if (!*out_attributes)
   {
      return CGLTF_ERROR_NOMEM;
   }
 
   for (cgltf_size j = 0; j < *out_attributes_count; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      i = cgltf_parse_json_string(options, tokens, i, json_chunk, &(*out_attributes)[j].name);
      if (i < 0)
      {
         return CGLTF_ERROR_JSON;
      }
 
      cgltf_parse_attribute_type((*out_attributes)[j].name, &(*out_attributes)[j].type, &(*out_attributes)[j].index);
 
      (*out_attributes)[j].data = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
      ++i;
   }
 
   return i;
}
 
static int cgltf_parse_json_extras(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_extras* out_extras)
{
   (void)json_chunk;
   out_extras->start_offset = tokens[i].start;
   out_extras->end_offset = tokens[i].end;
   i = cgltf_skip_json(tokens, i);
   return i;
}
 
static int cgltf_parse_json_unprocessed_extension(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_extension* out_extension)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_STRING);
   CGLTF_CHECK_TOKTYPE(tokens[i+1], JSMN_OBJECT);
   if (out_extension->name)
   {
      return CGLTF_ERROR_JSON;
   }
 
   cgltf_size name_length = tokens[i].end - tokens[i].start;
   out_extension->name = (char*)options->memory.alloc_func(options->memory.user_data, name_length + 1);
   if (!out_extension->name)
   {
      return CGLTF_ERROR_NOMEM;
   }
   strncpy(out_extension->name, (const char*)json_chunk + tokens[i].start, name_length);
   out_extension->name[name_length] = 0;
   i++;
 
   size_t start = tokens[i].start;
   size_t size = tokens[i].end - start;
   out_extension->data = (char*)options->memory.alloc_func(options->memory.user_data, size + 1);
   if (!out_extension->data)
   {
      return CGLTF_ERROR_NOMEM;
   }
   strncpy(out_extension->data, (const char*)json_chunk + start, size);
   out_extension->data[size] = '\0';
 
   i = cgltf_skip_json(tokens, i);
 
   return i;
}
 
static int cgltf_parse_json_unprocessed_extensions(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_size* out_extensions_count, cgltf_extension** out_extensions)
{
   ++i;
 
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
   if(*out_extensions)
   {
      return CGLTF_ERROR_JSON;
   }
 
   int extensions_size = tokens[i].size;
   *out_extensions_count = 0;
   *out_extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
 
   if (!*out_extensions)
   {
      return CGLTF_ERROR_NOMEM;
   }
 
   ++i;
 
   for (int j = 0; j < extensions_size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      cgltf_size extension_index = (*out_extensions_count)++;
      cgltf_extension* extension = &((*out_extensions)[extension_index]);
      i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, extension);
 
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_draco_mesh_compression(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_draco_mesh_compression* out_draco_mesh_compression)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "attributes") == 0)
      {
         i = cgltf_parse_json_attribute_list(options, tokens, i + 1, json_chunk, &out_draco_mesh_compression->attributes, &out_draco_mesh_compression->attributes_count);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "bufferView") == 0)
      {
         ++i;
         out_draco_mesh_compression->buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_mesh_gpu_instancing(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_mesh_gpu_instancing* out_mesh_gpu_instancing)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "attributes") == 0)
      {
         i = cgltf_parse_json_attribute_list(options, tokens, i + 1, json_chunk, &out_mesh_gpu_instancing->attributes, &out_mesh_gpu_instancing->attributes_count);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "bufferView") == 0)
      {
         ++i;
         out_mesh_gpu_instancing->buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_material_mapping_data(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_material_mapping* out_mappings, cgltf_size* offset)
{
   (void)options;
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
      int obj_size = tokens[i].size;
      ++i;
 
      int material = -1;
      int variants_tok = -1;
      cgltf_extras extras = {0, 0};
 
      for (int k = 0; k < obj_size; ++k)
      {
         CGLTF_CHECK_KEY(tokens[i]);
 
         if (cgltf_json_strcmp(tokens + i, json_chunk, "material") == 0)
         {
            ++i;
            material = cgltf_json_to_int(tokens + i, json_chunk);
            ++i;
         }
         else if (cgltf_json_strcmp(tokens + i, json_chunk, "variants") == 0)
         {
            variants_tok = i+1;
            CGLTF_CHECK_TOKTYPE(tokens[variants_tok], JSMN_ARRAY);
 
            i = cgltf_skip_json(tokens, i+1);
         }
         else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
         {
            i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &extras);
         }
         else
         {
            i = cgltf_skip_json(tokens, i+1);
         }
 
         if (i < 0)
         {
            return i;
         }
      }
 
      if (material < 0 || variants_tok < 0)
      {
         return CGLTF_ERROR_JSON;
      }
 
      if (out_mappings)
      {
         for (int k = 0; k < tokens[variants_tok].size; ++k)
         {
            int variant = cgltf_json_to_int(&tokens[variants_tok + 1 + k], json_chunk);
            if (variant < 0)
               return variant;
 
            out_mappings[*offset].material = CGLTF_PTRINDEX(cgltf_material, material);
            out_mappings[*offset].variant = variant;
            out_mappings[*offset].extras = extras;
 
            (*offset)++;
         }
      }
      else
      {
         (*offset) += tokens[variants_tok].size;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_material_mappings(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_primitive* out_prim)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "mappings") == 0)
      {
         if (out_prim->mappings)
         {
            return CGLTF_ERROR_JSON;
         }
 
         cgltf_size mappings_offset = 0;
         int k = cgltf_parse_json_material_mapping_data(options, tokens, i + 1, json_chunk, NULL, &mappings_offset);
         if (k < 0)
         {
            return k;
         }
 
         out_prim->mappings_count = mappings_offset;
         out_prim->mappings = (cgltf_material_mapping*)cgltf_calloc(options, sizeof(cgltf_material_mapping), out_prim->mappings_count);
 
         mappings_offset = 0;
         i = cgltf_parse_json_material_mapping_data(options, tokens, i + 1, json_chunk, out_prim->mappings, &mappings_offset);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_primitive(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_primitive* out_prim)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   out_prim->type = cgltf_primitive_type_triangles;
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "mode") == 0)
      {
         ++i;
         out_prim->type
               = (cgltf_primitive_type)
               cgltf_json_to_int(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "indices") == 0)
      {
         ++i;
         out_prim->indices = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "material") == 0)
      {
         ++i;
         out_prim->material = CGLTF_PTRINDEX(cgltf_material, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "attributes") == 0)
      {
         i = cgltf_parse_json_attribute_list(options, tokens, i + 1, json_chunk, &out_prim->attributes, &out_prim->attributes_count);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "targets") == 0)
      {
         i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_morph_target), (void**)&out_prim->targets, &out_prim->targets_count);
         if (i < 0)
         {
            return i;
         }
 
         for (cgltf_size k = 0; k < out_prim->targets_count; ++k)
         {
            i = cgltf_parse_json_attribute_list(options, tokens, i, json_chunk, &out_prim->targets[k].attributes, &out_prim->targets[k].attributes_count);
            if (i < 0)
            {
               return i;
            }
         }
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_prim->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         ++i;
 
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
         if(out_prim->extensions)
         {
            return CGLTF_ERROR_JSON;
         }
 
         int extensions_size = tokens[i].size;
         out_prim->extensions_count = 0;
         out_prim->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
 
         if (!out_prim->extensions)
         {
            return CGLTF_ERROR_NOMEM;
         }
 
         ++i;
         for (int k = 0; k < extensions_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_draco_mesh_compression") == 0)
            {
               out_prim->has_draco_mesh_compression = 1;
               i = cgltf_parse_json_draco_mesh_compression(options, tokens, i + 1, json_chunk, &out_prim->draco_mesh_compression);
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_variants") == 0)
            {
               i = cgltf_parse_json_material_mappings(options, tokens, i + 1, json_chunk, out_prim);
            }
            else
            {
               i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_prim->extensions[out_prim->extensions_count++]));
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_mesh(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_mesh* out_mesh)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_mesh->name);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "primitives") == 0)
      {
         i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_primitive), (void**)&out_mesh->primitives, &out_mesh->primitives_count);
         if (i < 0)
         {
            return i;
         }
 
         for (cgltf_size prim_index = 0; prim_index < out_mesh->primitives_count; ++prim_index)
         {
            i = cgltf_parse_json_primitive(options, tokens, i, json_chunk, &out_mesh->primitives[prim_index]);
            if (i < 0)
            {
               return i;
            }
         }
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "weights") == 0)
      {
         i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_float), (void**)&out_mesh->weights, &out_mesh->weights_count);
         if (i < 0)
         {
            return i;
         }
 
         i = cgltf_parse_json_float_array(tokens, i - 1, json_chunk, out_mesh->weights, (int)out_mesh->weights_count);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         ++i;
 
         out_mesh->extras.start_offset = tokens[i].start;
         out_mesh->extras.end_offset = tokens[i].end;
 
         if (tokens[i].type == JSMN_OBJECT)
         {
            int extras_size = tokens[i].size;
            ++i;
 
            for (int k = 0; k < extras_size; ++k)
            {
               CGLTF_CHECK_KEY(tokens[i]);
 
               if (cgltf_json_strcmp(tokens+i, json_chunk, "targetNames") == 0 && tokens[i+1].type == JSMN_ARRAY)
               {
                  i = cgltf_parse_json_string_array(options, tokens, i + 1, json_chunk, &out_mesh->target_names, &out_mesh->target_names_count);
               }
               else
               {
                  i = cgltf_skip_json(tokens, i+1);
               }
 
               if (i < 0)
               {
                  return i;
               }
            }
         }
         else
         {
            i = cgltf_skip_json(tokens, i);
         }
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_mesh->extensions_count, &out_mesh->extensions);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_meshes(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_mesh), (void**)&out_data->meshes, &out_data->meshes_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->meshes_count; ++j)
   {
      i = cgltf_parse_json_mesh(options, tokens, i, json_chunk, &out_data->meshes[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static cgltf_component_type cgltf_json_to_component_type(jsmntok_t const* tok, const uint8_t* json_chunk)
{
   int type = cgltf_json_to_int(tok, json_chunk);
 
   switch (type)
   {
   case 5120:
      return cgltf_component_type_r_8;
   case 5121:
      return cgltf_component_type_r_8u;
   case 5122:
      return cgltf_component_type_r_16;
   case 5123:
      return cgltf_component_type_r_16u;
   case 5125:
      return cgltf_component_type_r_32u;
   case 5126:
      return cgltf_component_type_r_32f;
   default:
      return cgltf_component_type_invalid;
   }
}
 
static int cgltf_parse_json_accessor_sparse(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_accessor_sparse* out_sparse)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "count") == 0)
      {
         ++i;
         out_sparse->count = cgltf_json_to_int(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "indices") == 0)
      {
         ++i;
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
         int indices_size = tokens[i].size;
         ++i;
 
         for (int k = 0; k < indices_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
            {
               ++i;
               out_sparse->indices_buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
               ++i;
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
            {
               ++i;
               out_sparse->indices_byte_offset = cgltf_json_to_size(tokens + i, json_chunk);
               ++i;
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "componentType") == 0)
            {
               ++i;
               out_sparse->indices_component_type = cgltf_json_to_component_type(tokens + i, json_chunk);
               ++i;
            }
            else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
            {
               i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_sparse->indices_extras);
            }
            else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
            {
               i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_sparse->indices_extensions_count, &out_sparse->indices_extensions);
            }
            else
            {
               i = cgltf_skip_json(tokens, i+1);
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "values") == 0)
      {
         ++i;
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
         int values_size = tokens[i].size;
         ++i;
 
         for (int k = 0; k < values_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
            {
               ++i;
               out_sparse->values_buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
               ++i;
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
            {
               ++i;
               out_sparse->values_byte_offset = cgltf_json_to_size(tokens + i, json_chunk);
               ++i;
            }
            else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
            {
               i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_sparse->values_extras);
            }
            else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
            {
               i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_sparse->values_extensions_count, &out_sparse->values_extensions);
            }
            else
            {
               i = cgltf_skip_json(tokens, i+1);
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_sparse->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_sparse->extensions_count, &out_sparse->extensions);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_accessor(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_accessor* out_accessor)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_accessor->name);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
      {
         ++i;
         out_accessor->buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
      {
         ++i;
         out_accessor->offset =
               cgltf_json_to_size(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "componentType") == 0)
      {
         ++i;
         out_accessor->component_type = cgltf_json_to_component_type(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "normalized") == 0)
      {
         ++i;
         out_accessor->normalized = cgltf_json_to_bool(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "count") == 0)
      {
         ++i;
         out_accessor->count =
               cgltf_json_to_int(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "type") == 0)
      {
         ++i;
         if (cgltf_json_strcmp(tokens+i, json_chunk, "SCALAR") == 0)
         {
            out_accessor->type = cgltf_type_scalar;
         }
         else if (cgltf_json_strcmp(tokens+i, json_chunk, "VEC2") == 0)
         {
            out_accessor->type = cgltf_type_vec2;
         }
         else if (cgltf_json_strcmp(tokens+i, json_chunk, "VEC3") == 0)
         {
            out_accessor->type = cgltf_type_vec3;
         }
         else if (cgltf_json_strcmp(tokens+i, json_chunk, "VEC4") == 0)
         {
            out_accessor->type = cgltf_type_vec4;
         }
         else if (cgltf_json_strcmp(tokens+i, json_chunk, "MAT2") == 0)
         {
            out_accessor->type = cgltf_type_mat2;
         }
         else if (cgltf_json_strcmp(tokens+i, json_chunk, "MAT3") == 0)
         {
            out_accessor->type = cgltf_type_mat3;
         }
         else if (cgltf_json_strcmp(tokens+i, json_chunk, "MAT4") == 0)
         {
            out_accessor->type = cgltf_type_mat4;
         }
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "min") == 0)
      {
         ++i;
         out_accessor->has_min = 1;
         // note: we can't parse the precise number of elements since type may not have been computed yet
         int min_size = tokens[i].size > 16 ? 16 : tokens[i].size;
         i = cgltf_parse_json_float_array(tokens, i, json_chunk, out_accessor->min, min_size);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "max") == 0)
      {
         ++i;
         out_accessor->has_max = 1;
         // note: we can't parse the precise number of elements since type may not have been computed yet
         int max_size = tokens[i].size > 16 ? 16 : tokens[i].size;
         i = cgltf_parse_json_float_array(tokens, i, json_chunk, out_accessor->max, max_size);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "sparse") == 0)
      {
         out_accessor->is_sparse = 1;
         i = cgltf_parse_json_accessor_sparse(options, tokens, i + 1, json_chunk, &out_accessor->sparse);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_accessor->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_accessor->extensions_count, &out_accessor->extensions);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_texture_transform(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_texture_transform* out_texture_transform)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "offset") == 0)
      {
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_texture_transform->offset, 2);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "rotation") == 0)
      {
         ++i;
         out_texture_transform->rotation = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "scale") == 0)
      {
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_texture_transform->scale, 2);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "texCoord") == 0)
      {
         ++i;
         out_texture_transform->has_texcoord = 1;
         out_texture_transform->texcoord = cgltf_json_to_int(tokens + i, json_chunk);
         ++i;
      }
      else
      {
         i = cgltf_skip_json(tokens, i + 1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_texture_view(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_texture_view* out_texture_view)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   out_texture_view->scale = 1.0f;
   cgltf_fill_float_array(out_texture_view->transform.scale, 2, 1.0f);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "index") == 0)
      {
         ++i;
         out_texture_view->texture = CGLTF_PTRINDEX(cgltf_texture, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "texCoord") == 0)
      {
         ++i;
         out_texture_view->texcoord = cgltf_json_to_int(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "scale") == 0)
      {
         ++i;
         out_texture_view->scale = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "strength") == 0)
      {
         ++i;
         out_texture_view->scale = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_texture_view->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         ++i;
 
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
         if(out_texture_view->extensions)
         {
            return CGLTF_ERROR_JSON;
         }
 
         int extensions_size = tokens[i].size;
         out_texture_view->extensions_count = 0;
         out_texture_view->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
 
         if (!out_texture_view->extensions)
         {
            return CGLTF_ERROR_NOMEM;
         }
 
         ++i;
 
         for (int k = 0; k < extensions_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_texture_transform") == 0)
            {
               out_texture_view->has_transform = 1;
               i = cgltf_parse_json_texture_transform(tokens, i + 1, json_chunk, &out_texture_view->transform);
            }
            else
            {
               i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_texture_view->extensions[out_texture_view->extensions_count++]));
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else
      {
         i = cgltf_skip_json(tokens, i + 1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_pbr_metallic_roughness(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_pbr_metallic_roughness* out_pbr)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "metallicFactor") == 0)
      {
         ++i;
         out_pbr->metallic_factor =
            cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "roughnessFactor") == 0)
      {
         ++i;
         out_pbr->roughness_factor =
            cgltf_json_to_float(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "baseColorFactor") == 0)
      {
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_pbr->base_color_factor, 4);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "baseColorTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
            &out_pbr->base_color_texture);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "metallicRoughnessTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
            &out_pbr->metallic_roughness_texture);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_pbr->extras);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_pbr_specular_glossiness(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_pbr_specular_glossiness* out_pbr)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "diffuseFactor") == 0)
      {
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_pbr->diffuse_factor, 4);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "specularFactor") == 0)
      {
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_pbr->specular_factor, 3);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "glossinessFactor") == 0)
      {
         ++i;
         out_pbr->glossiness_factor = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "diffuseTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_pbr->diffuse_texture);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "specularGlossinessTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_pbr->specular_glossiness_texture);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_clearcoat(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_clearcoat* out_clearcoat)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatFactor") == 0)
      {
         ++i;
         out_clearcoat->clearcoat_factor = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatRoughnessFactor") == 0)
      {
         ++i;
         out_clearcoat->clearcoat_roughness_factor = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_clearcoat->clearcoat_texture);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatRoughnessTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_clearcoat->clearcoat_roughness_texture);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatNormalTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_clearcoat->clearcoat_normal_texture);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_ior(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_ior* out_ior)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
   int size = tokens[i].size;
   ++i;
 
   // Default values
   out_ior->ior = 1.5f;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "ior") == 0)
      {
         ++i;
         out_ior->ior = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_specular(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_specular* out_specular)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
   int size = tokens[i].size;
   ++i;
 
   // Default values
   out_specular->specular_factor = 1.0f;
   cgltf_fill_float_array(out_specular->specular_color_factor, 3, 1.0f);
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "specularFactor") == 0)
      {
         ++i;
         out_specular->specular_factor = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "specularColorFactor") == 0)
      {
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_specular->specular_color_factor, 3);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "specularTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_specular->specular_texture);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "specularColorTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_specular->specular_color_texture);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_transmission(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_transmission* out_transmission)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "transmissionFactor") == 0)
      {
         ++i;
         out_transmission->transmission_factor = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "transmissionTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_transmission->transmission_texture);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_volume(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_volume* out_volume)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "thicknessFactor") == 0)
      {
         ++i;
         out_volume->thickness_factor = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "thicknessTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_volume->thickness_texture);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "attenuationColor") == 0)
      {
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_volume->attenuation_color, 3);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "attenuationDistance") == 0)
      {
         ++i;
         out_volume->attenuation_distance = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else
      {
         i = cgltf_skip_json(tokens, i + 1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_sheen(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_sheen* out_sheen)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "sheenColorFactor") == 0)
      {
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_sheen->sheen_color_factor, 3);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "sheenColorTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_sheen->sheen_color_texture);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "sheenRoughnessFactor") == 0)
      {
         ++i;
         out_sheen->sheen_roughness_factor = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "sheenRoughnessTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_sheen->sheen_roughness_texture);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_emissive_strength(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_emissive_strength* out_emissive_strength)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
   int size = tokens[i].size;
   ++i;
 
   // Default
   out_emissive_strength->emissive_strength = 1.f;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "emissiveStrength") == 0)
      {
         ++i;
         out_emissive_strength->emissive_strength = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else
      {
         i = cgltf_skip_json(tokens, i + 1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_iridescence(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_iridescence* out_iridescence)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
   int size = tokens[i].size;
   ++i;
 
   // Default
   out_iridescence->iridescence_ior = 1.3f;
   out_iridescence->iridescence_thickness_min = 100.f;
   out_iridescence->iridescence_thickness_max = 400.f;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "iridescenceFactor") == 0)
      {
         ++i;
         out_iridescence->iridescence_factor = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "iridescenceTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_iridescence->iridescence_texture);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "iridescenceIor") == 0)
      {
         ++i;
         out_iridescence->iridescence_ior = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "iridescenceThicknessMinimum") == 0)
      {
         ++i;
         out_iridescence->iridescence_thickness_min = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "iridescenceThicknessMaximum") == 0)
      {
         ++i;
         out_iridescence->iridescence_thickness_max = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "iridescenceThicknessTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_iridescence->iridescence_thickness_texture);
      }
      else
      {
         i = cgltf_skip_json(tokens, i + 1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_image(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_image* out_image)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "uri") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_image->uri);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
      {
         ++i;
         out_image->buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "mimeType") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_image->mime_type);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_image->name);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_image->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_image->extensions_count, &out_image->extensions);
      }
      else
      {
         i = cgltf_skip_json(tokens, i + 1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_sampler(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_sampler* out_sampler)
{
   (void)options;
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   out_sampler->wrap_s = 10497;
   out_sampler->wrap_t = 10497;
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_sampler->name);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "magFilter") == 0)
      {
         ++i;
         out_sampler->mag_filter
            = cgltf_json_to_int(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "minFilter") == 0)
      {
         ++i;
         out_sampler->min_filter
            = cgltf_json_to_int(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "wrapS") == 0)
      {
         ++i;
         out_sampler->wrap_s
            = cgltf_json_to_int(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "wrapT") == 0)
      {
         ++i;
         out_sampler->wrap_t
            = cgltf_json_to_int(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_sampler->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_sampler->extensions_count, &out_sampler->extensions);
      }
      else
      {
         i = cgltf_skip_json(tokens, i + 1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_texture(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_texture* out_texture)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_texture->name);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "sampler") == 0)
      {
         ++i;
         out_texture->sampler = CGLTF_PTRINDEX(cgltf_sampler, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "source") == 0)
      {
         ++i;
         out_texture->image = CGLTF_PTRINDEX(cgltf_image, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_texture->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         ++i;
 
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
         if (out_texture->extensions)
         {
            return CGLTF_ERROR_JSON;
         }
 
         int extensions_size = tokens[i].size;
         ++i;
         out_texture->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
         out_texture->extensions_count = 0;
 
         if (!out_texture->extensions)
         {
            return CGLTF_ERROR_NOMEM;
         }
 
         for (int k = 0; k < extensions_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens + i, json_chunk, "KHR_texture_basisu") == 0)
            {
               out_texture->has_basisu = 1;
               ++i;
               CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
               int num_properties = tokens[i].size;
               ++i;
 
               for (int t = 0; t < num_properties; ++t)
               {
                  CGLTF_CHECK_KEY(tokens[i]);
 
                  if (cgltf_json_strcmp(tokens + i, json_chunk, "source") == 0)
                  {
                     ++i;
                     out_texture->basisu_image = CGLTF_PTRINDEX(cgltf_image, cgltf_json_to_int(tokens + i, json_chunk));
                     ++i;
                  }
                  else
                  {
                     i = cgltf_skip_json(tokens, i + 1);
                  }
                  if (i < 0)
                  {
                     return i;
                  }
               }
            }
            else
            {
               i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_texture->extensions[out_texture->extensions_count++]));
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else
      {
         i = cgltf_skip_json(tokens, i + 1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_material(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_material* out_material)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   cgltf_fill_float_array(out_material->pbr_metallic_roughness.base_color_factor, 4, 1.0f);
   out_material->pbr_metallic_roughness.metallic_factor = 1.0f;
   out_material->pbr_metallic_roughness.roughness_factor = 1.0f;
 
   cgltf_fill_float_array(out_material->pbr_specular_glossiness.diffuse_factor, 4, 1.0f);
   cgltf_fill_float_array(out_material->pbr_specular_glossiness.specular_factor, 3, 1.0f);
   out_material->pbr_specular_glossiness.glossiness_factor = 1.0f;
 
   cgltf_fill_float_array(out_material->volume.attenuation_color, 3, 1.0f);
   out_material->volume.attenuation_distance = FLT_MAX;
 
   out_material->alpha_cutoff = 0.5f;
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_material->name);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "pbrMetallicRoughness") == 0)
      {
         out_material->has_pbr_metallic_roughness = 1;
         i = cgltf_parse_json_pbr_metallic_roughness(options, tokens, i + 1, json_chunk, &out_material->pbr_metallic_roughness);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "emissiveFactor") == 0)
      {
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_material->emissive_factor, 3);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "normalTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
            &out_material->normal_texture);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "occlusionTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
            &out_material->occlusion_texture);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "emissiveTexture") == 0)
      {
         i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
            &out_material->emissive_texture);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "alphaMode") == 0)
      {
         ++i;
         if (cgltf_json_strcmp(tokens + i, json_chunk, "OPAQUE") == 0)
         {
            out_material->alpha_mode = cgltf_alpha_mode_opaque;
         }
         else if (cgltf_json_strcmp(tokens + i, json_chunk, "MASK") == 0)
         {
            out_material->alpha_mode = cgltf_alpha_mode_mask;
         }
         else if (cgltf_json_strcmp(tokens + i, json_chunk, "BLEND") == 0)
         {
            out_material->alpha_mode = cgltf_alpha_mode_blend;
         }
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "alphaCutoff") == 0)
      {
         ++i;
         out_material->alpha_cutoff = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "doubleSided") == 0)
      {
         ++i;
         out_material->double_sided =
            cgltf_json_to_bool(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_material->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         ++i;
 
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
         if(out_material->extensions)
         {
            return CGLTF_ERROR_JSON;
         }
 
         int extensions_size = tokens[i].size;
         ++i;
         out_material->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
         out_material->extensions_count= 0;
 
         if (!out_material->extensions)
         {
            return CGLTF_ERROR_NOMEM;
         }
 
         for (int k = 0; k < extensions_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_pbrSpecularGlossiness") == 0)
            {
               out_material->has_pbr_specular_glossiness = 1;
               i = cgltf_parse_json_pbr_specular_glossiness(options, tokens, i + 1, json_chunk, &out_material->pbr_specular_glossiness);
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_unlit") == 0)
            {
               out_material->unlit = 1;
               i = cgltf_skip_json(tokens, i+1);
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_clearcoat") == 0)
            {
               out_material->has_clearcoat = 1;
               i = cgltf_parse_json_clearcoat(options, tokens, i + 1, json_chunk, &out_material->clearcoat);
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_ior") == 0)
            {
               out_material->has_ior = 1;
               i = cgltf_parse_json_ior(tokens, i + 1, json_chunk, &out_material->ior);
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_specular") == 0)
            {
               out_material->has_specular = 1;
               i = cgltf_parse_json_specular(options, tokens, i + 1, json_chunk, &out_material->specular);
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_transmission") == 0)
            {
               out_material->has_transmission = 1;
               i = cgltf_parse_json_transmission(options, tokens, i + 1, json_chunk, &out_material->transmission);
            }
            else if (cgltf_json_strcmp(tokens + i, json_chunk, "KHR_materials_volume") == 0)
            {
               out_material->has_volume = 1;
               i = cgltf_parse_json_volume(options, tokens, i + 1, json_chunk, &out_material->volume);
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_sheen") == 0)
            {
               out_material->has_sheen = 1;
               i = cgltf_parse_json_sheen(options, tokens, i + 1, json_chunk, &out_material->sheen);
            }
            else if (cgltf_json_strcmp(tokens + i, json_chunk, "KHR_materials_emissive_strength") == 0)
            {
               out_material->has_emissive_strength = 1;
               i = cgltf_parse_json_emissive_strength(tokens, i + 1, json_chunk, &out_material->emissive_strength);
            }
            else if (cgltf_json_strcmp(tokens + i, json_chunk, "KHR_materials_iridescence") == 0)
            {
               out_material->has_iridescence = 1;
               i = cgltf_parse_json_iridescence(options, tokens, i + 1, json_chunk, &out_material->iridescence);
            }
            else
            {
               i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_material->extensions[out_material->extensions_count++]));
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_accessors(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_accessor), (void**)&out_data->accessors, &out_data->accessors_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->accessors_count; ++j)
   {
      i = cgltf_parse_json_accessor(options, tokens, i, json_chunk, &out_data->accessors[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_materials(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_material), (void**)&out_data->materials, &out_data->materials_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->materials_count; ++j)
   {
      i = cgltf_parse_json_material(options, tokens, i, json_chunk, &out_data->materials[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_images(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_image), (void**)&out_data->images, &out_data->images_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->images_count; ++j)
   {
      i = cgltf_parse_json_image(options, tokens, i, json_chunk, &out_data->images[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_textures(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_texture), (void**)&out_data->textures, &out_data->textures_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->textures_count; ++j)
   {
      i = cgltf_parse_json_texture(options, tokens, i, json_chunk, &out_data->textures[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_samplers(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_sampler), (void**)&out_data->samplers, &out_data->samplers_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->samplers_count; ++j)
   {
      i = cgltf_parse_json_sampler(options, tokens, i, json_chunk, &out_data->samplers[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_meshopt_compression(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_meshopt_compression* out_meshopt_compression)
{
   (void)options;
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "buffer") == 0)
      {
         ++i;
         out_meshopt_compression->buffer = CGLTF_PTRINDEX(cgltf_buffer, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
      {
         ++i;
         out_meshopt_compression->offset = cgltf_json_to_size(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteLength") == 0)
      {
         ++i;
         out_meshopt_compression->size = cgltf_json_to_size(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteStride") == 0)
      {
         ++i;
         out_meshopt_compression->stride = cgltf_json_to_size(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "count") == 0)
      {
         ++i;
         out_meshopt_compression->count = cgltf_json_to_int(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "mode") == 0)
      {
         ++i;
         if (cgltf_json_strcmp(tokens+i, json_chunk, "ATTRIBUTES") == 0)
         {
            out_meshopt_compression->mode = cgltf_meshopt_compression_mode_attributes;
         }
         else if (cgltf_json_strcmp(tokens+i, json_chunk, "TRIANGLES") == 0)
         {
            out_meshopt_compression->mode = cgltf_meshopt_compression_mode_triangles;
         }
         else if (cgltf_json_strcmp(tokens+i, json_chunk, "INDICES") == 0)
         {
            out_meshopt_compression->mode = cgltf_meshopt_compression_mode_indices;
         }
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "filter") == 0)
      {
         ++i;
         if (cgltf_json_strcmp(tokens+i, json_chunk, "NONE") == 0)
         {
            out_meshopt_compression->filter = cgltf_meshopt_compression_filter_none;
         }
         else if (cgltf_json_strcmp(tokens+i, json_chunk, "OCTAHEDRAL") == 0)
         {
            out_meshopt_compression->filter = cgltf_meshopt_compression_filter_octahedral;
         }
         else if (cgltf_json_strcmp(tokens+i, json_chunk, "QUATERNION") == 0)
         {
            out_meshopt_compression->filter = cgltf_meshopt_compression_filter_quaternion;
         }
         else if (cgltf_json_strcmp(tokens+i, json_chunk, "EXPONENTIAL") == 0)
         {
            out_meshopt_compression->filter = cgltf_meshopt_compression_filter_exponential;
         }
         ++i;
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_buffer_view(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_buffer_view* out_buffer_view)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_buffer_view->name);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "buffer") == 0)
      {
         ++i;
         out_buffer_view->buffer = CGLTF_PTRINDEX(cgltf_buffer, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
      {
         ++i;
         out_buffer_view->offset =
               cgltf_json_to_size(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteLength") == 0)
      {
         ++i;
         out_buffer_view->size =
               cgltf_json_to_size(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteStride") == 0)
      {
         ++i;
         out_buffer_view->stride =
               cgltf_json_to_size(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "target") == 0)
      {
         ++i;
         int type = cgltf_json_to_int(tokens+i, json_chunk);
         switch (type)
         {
         case 34962:
            type = cgltf_buffer_view_type_vertices;
            break;
         case 34963:
            type = cgltf_buffer_view_type_indices;
            break;
         default:
            type = cgltf_buffer_view_type_invalid;
            break;
         }
         out_buffer_view->type = (cgltf_buffer_view_type)type;
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_buffer_view->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         ++i;
 
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
         if(out_buffer_view->extensions)
         {
            return CGLTF_ERROR_JSON;
         }
 
         int extensions_size = tokens[i].size;
         out_buffer_view->extensions_count = 0;
         out_buffer_view->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
 
         if (!out_buffer_view->extensions)
         {
            return CGLTF_ERROR_NOMEM;
         }
 
         ++i;
         for (int k = 0; k < extensions_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens+i, json_chunk, "EXT_meshopt_compression") == 0)
            {
               out_buffer_view->has_meshopt_compression = 1;
               i = cgltf_parse_json_meshopt_compression(options, tokens, i + 1, json_chunk, &out_buffer_view->meshopt_compression);
            }
            else
            {
               i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_buffer_view->extensions[out_buffer_view->extensions_count++]));
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_buffer_views(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_buffer_view), (void**)&out_data->buffer_views, &out_data->buffer_views_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->buffer_views_count; ++j)
   {
      i = cgltf_parse_json_buffer_view(options, tokens, i, json_chunk, &out_data->buffer_views[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_buffer(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_buffer* out_buffer)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_buffer->name);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteLength") == 0)
      {
         ++i;
         out_buffer->size =
               cgltf_json_to_size(tokens+i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "uri") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_buffer->uri);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_buffer->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_buffer->extensions_count, &out_buffer->extensions);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_buffers(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_buffer), (void**)&out_data->buffers, &out_data->buffers_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->buffers_count; ++j)
   {
      i = cgltf_parse_json_buffer(options, tokens, i, json_chunk, &out_data->buffers[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_skin(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_skin* out_skin)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_skin->name);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "joints") == 0)
      {
         i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_node*), (void**)&out_skin->joints, &out_skin->joints_count);
         if (i < 0)
         {
            return i;
         }
 
         for (cgltf_size k = 0; k < out_skin->joints_count; ++k)
         {
            out_skin->joints[k] = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
            ++i;
         }
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "skeleton") == 0)
      {
         ++i;
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
         out_skin->skeleton = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "inverseBindMatrices") == 0)
      {
         ++i;
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
         out_skin->inverse_bind_matrices = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_skin->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_skin->extensions_count, &out_skin->extensions);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_skins(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_skin), (void**)&out_data->skins, &out_data->skins_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->skins_count; ++j)
   {
      i = cgltf_parse_json_skin(options, tokens, i, json_chunk, &out_data->skins[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_camera(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_camera* out_camera)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_camera->name);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "type") == 0)
      {
         ++i;
         if (cgltf_json_strcmp(tokens + i, json_chunk, "perspective") == 0)
         {
            out_camera->type = cgltf_camera_type_perspective;
         }
         else if (cgltf_json_strcmp(tokens + i, json_chunk, "orthographic") == 0)
         {
            out_camera->type = cgltf_camera_type_orthographic;
         }
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "perspective") == 0)
      {
         ++i;
 
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
         int data_size = tokens[i].size;
         ++i;
 
         out_camera->type = cgltf_camera_type_perspective;
 
         for (int k = 0; k < data_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens+i, json_chunk, "aspectRatio") == 0)
            {
               ++i;
               out_camera->data.perspective.has_aspect_ratio = 1;
               out_camera->data.perspective.aspect_ratio = cgltf_json_to_float(tokens + i, json_chunk);
               ++i;
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "yfov") == 0)
            {
               ++i;
               out_camera->data.perspective.yfov = cgltf_json_to_float(tokens + i, json_chunk);
               ++i;
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "zfar") == 0)
            {
               ++i;
               out_camera->data.perspective.has_zfar = 1;
               out_camera->data.perspective.zfar = cgltf_json_to_float(tokens + i, json_chunk);
               ++i;
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "znear") == 0)
            {
               ++i;
               out_camera->data.perspective.znear = cgltf_json_to_float(tokens + i, json_chunk);
               ++i;
            }
            else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
            {
               i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_camera->data.perspective.extras);
            }
            else
            {
               i = cgltf_skip_json(tokens, i+1);
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "orthographic") == 0)
      {
         ++i;
 
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
         int data_size = tokens[i].size;
         ++i;
 
         out_camera->type = cgltf_camera_type_orthographic;
 
         for (int k = 0; k < data_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens+i, json_chunk, "xmag") == 0)
            {
               ++i;
               out_camera->data.orthographic.xmag = cgltf_json_to_float(tokens + i, json_chunk);
               ++i;
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "ymag") == 0)
            {
               ++i;
               out_camera->data.orthographic.ymag = cgltf_json_to_float(tokens + i, json_chunk);
               ++i;
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "zfar") == 0)
            {
               ++i;
               out_camera->data.orthographic.zfar = cgltf_json_to_float(tokens + i, json_chunk);
               ++i;
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "znear") == 0)
            {
               ++i;
               out_camera->data.orthographic.znear = cgltf_json_to_float(tokens + i, json_chunk);
               ++i;
            }
            else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
            {
               i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_camera->data.orthographic.extras);
            }
            else
            {
               i = cgltf_skip_json(tokens, i+1);
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_camera->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_camera->extensions_count, &out_camera->extensions);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_cameras(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_camera), (void**)&out_data->cameras, &out_data->cameras_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->cameras_count; ++j)
   {
      i = cgltf_parse_json_camera(options, tokens, i, json_chunk, &out_data->cameras[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_light(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_light* out_light)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   out_light->color[0] = 1.f;
   out_light->color[1] = 1.f;
   out_light->color[2] = 1.f;
   out_light->intensity = 1.f;
 
   out_light->spot_inner_cone_angle = 0.f;
   out_light->spot_outer_cone_angle = 3.1415926535f / 4.0f;
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_light->name);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "color") == 0)
      {
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_light->color, 3);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "intensity") == 0)
      {
         ++i;
         out_light->intensity = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "type") == 0)
      {
         ++i;
         if (cgltf_json_strcmp(tokens + i, json_chunk, "directional") == 0)
         {
            out_light->type = cgltf_light_type_directional;
         }
         else if (cgltf_json_strcmp(tokens + i, json_chunk, "point") == 0)
         {
            out_light->type = cgltf_light_type_point;
         }
         else if (cgltf_json_strcmp(tokens + i, json_chunk, "spot") == 0)
         {
            out_light->type = cgltf_light_type_spot;
         }
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "range") == 0)
      {
         ++i;
         out_light->range = cgltf_json_to_float(tokens + i, json_chunk);
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "spot") == 0)
      {
         ++i;
 
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
         int data_size = tokens[i].size;
         ++i;
 
         for (int k = 0; k < data_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens+i, json_chunk, "innerConeAngle") == 0)
            {
               ++i;
               out_light->spot_inner_cone_angle = cgltf_json_to_float(tokens + i, json_chunk);
               ++i;
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "outerConeAngle") == 0)
            {
               ++i;
               out_light->spot_outer_cone_angle = cgltf_json_to_float(tokens + i, json_chunk);
               ++i;
            }
            else
            {
               i = cgltf_skip_json(tokens, i+1);
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_light->extras);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_lights(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_light), (void**)&out_data->lights, &out_data->lights_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->lights_count; ++j)
   {
      i = cgltf_parse_json_light(options, tokens, i, json_chunk, &out_data->lights[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_node(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_node* out_node)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   out_node->rotation[3] = 1.0f;
   out_node->scale[0] = 1.0f;
   out_node->scale[1] = 1.0f;
   out_node->scale[2] = 1.0f;
   out_node->matrix[0] = 1.0f;
   out_node->matrix[5] = 1.0f;
   out_node->matrix[10] = 1.0f;
   out_node->matrix[15] = 1.0f;
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_node->name);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "children") == 0)
      {
         i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_node*), (void**)&out_node->children, &out_node->children_count);
         if (i < 0)
         {
            return i;
         }
 
         for (cgltf_size k = 0; k < out_node->children_count; ++k)
         {
            out_node->children[k] = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
            ++i;
         }
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "mesh") == 0)
      {
         ++i;
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
         out_node->mesh = CGLTF_PTRINDEX(cgltf_mesh, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "skin") == 0)
      {
         ++i;
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
         out_node->skin = CGLTF_PTRINDEX(cgltf_skin, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "camera") == 0)
      {
         ++i;
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
         out_node->camera = CGLTF_PTRINDEX(cgltf_camera, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "translation") == 0)
      {
         out_node->has_translation = 1;
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_node->translation, 3);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "rotation") == 0)
      {
         out_node->has_rotation = 1;
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_node->rotation, 4);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "scale") == 0)
      {
         out_node->has_scale = 1;
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_node->scale, 3);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "matrix") == 0)
      {
         out_node->has_matrix = 1;
         i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_node->matrix, 16);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "weights") == 0)
      {
         i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_float), (void**)&out_node->weights, &out_node->weights_count);
         if (i < 0)
         {
            return i;
         }
 
         i = cgltf_parse_json_float_array(tokens, i - 1, json_chunk, out_node->weights, (int)out_node->weights_count);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_node->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         ++i;
 
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
         if(out_node->extensions)
         {
            return CGLTF_ERROR_JSON;
         }
 
         int extensions_size = tokens[i].size;
         out_node->extensions_count= 0;
         out_node->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
 
         if (!out_node->extensions)
         {
            return CGLTF_ERROR_NOMEM;
         }
 
         ++i;
 
         for (int k = 0; k < extensions_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_lights_punctual") == 0)
            {
               ++i;
 
               CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
               int data_size = tokens[i].size;
               ++i;
 
               for (int m = 0; m < data_size; ++m)
               {
                  CGLTF_CHECK_KEY(tokens[i]);
 
                  if (cgltf_json_strcmp(tokens + i, json_chunk, "light") == 0)
                  {
                     ++i;
                     CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
                     out_node->light = CGLTF_PTRINDEX(cgltf_light, cgltf_json_to_int(tokens + i, json_chunk));
                     ++i;
                  }
                  else
                  {
                     i = cgltf_skip_json(tokens, i + 1);
                  }
 
                  if (i < 0)
                  {
                     return i;
                  }
               }
            }
            else if (cgltf_json_strcmp(tokens + i, json_chunk, "EXT_mesh_gpu_instancing") == 0)
            {
               out_node->has_mesh_gpu_instancing = 1;
               i = cgltf_parse_json_mesh_gpu_instancing(options, tokens, i + 1, json_chunk, &out_node->mesh_gpu_instancing);
            }
            else
            {
               i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_node->extensions[out_node->extensions_count++]));
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_nodes(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_node), (void**)&out_data->nodes, &out_data->nodes_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->nodes_count; ++j)
   {
      i = cgltf_parse_json_node(options, tokens, i, json_chunk, &out_data->nodes[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_scene(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_scene* out_scene)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_scene->name);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "nodes") == 0)
      {
         i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_node*), (void**)&out_scene->nodes, &out_scene->nodes_count);
         if (i < 0)
         {
            return i;
         }
 
         for (cgltf_size k = 0; k < out_scene->nodes_count; ++k)
         {
            out_scene->nodes[k] = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
            ++i;
         }
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_scene->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_scene->extensions_count, &out_scene->extensions);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_scenes(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_scene), (void**)&out_data->scenes, &out_data->scenes_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->scenes_count; ++j)
   {
      i = cgltf_parse_json_scene(options, tokens, i, json_chunk, &out_data->scenes[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_animation_sampler(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_animation_sampler* out_sampler)
{
   (void)options;
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "input") == 0)
      {
         ++i;
         out_sampler->input = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "output") == 0)
      {
         ++i;
         out_sampler->output = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "interpolation") == 0)
      {
         ++i;
         if (cgltf_json_strcmp(tokens + i, json_chunk, "LINEAR") == 0)
         {
            out_sampler->interpolation = cgltf_interpolation_type_linear;
         }
         else if (cgltf_json_strcmp(tokens + i, json_chunk, "STEP") == 0)
         {
            out_sampler->interpolation = cgltf_interpolation_type_step;
         }
         else if (cgltf_json_strcmp(tokens + i, json_chunk, "CUBICSPLINE") == 0)
         {
            out_sampler->interpolation = cgltf_interpolation_type_cubic_spline;
         }
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_sampler->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_sampler->extensions_count, &out_sampler->extensions);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_animation_channel(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_animation_channel* out_channel)
{
   (void)options;
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "sampler") == 0)
      {
         ++i;
         out_channel->sampler = CGLTF_PTRINDEX(cgltf_animation_sampler, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "target") == 0)
      {
         ++i;
 
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
         int target_size = tokens[i].size;
         ++i;
 
         for (int k = 0; k < target_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens+i, json_chunk, "node") == 0)
            {
               ++i;
               out_channel->target_node = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
               ++i;
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "path") == 0)
            {
               ++i;
               if (cgltf_json_strcmp(tokens+i, json_chunk, "translation") == 0)
               {
                  out_channel->target_path = cgltf_animation_path_type_translation;
               }
               else if (cgltf_json_strcmp(tokens+i, json_chunk, "rotation") == 0)
               {
                  out_channel->target_path = cgltf_animation_path_type_rotation;
               }
               else if (cgltf_json_strcmp(tokens+i, json_chunk, "scale") == 0)
               {
                  out_channel->target_path = cgltf_animation_path_type_scale;
               }
               else if (cgltf_json_strcmp(tokens+i, json_chunk, "weights") == 0)
               {
                  out_channel->target_path = cgltf_animation_path_type_weights;
               }
               ++i;
            }
            else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
            {
               i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_channel->extras);
            }
            else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
            {
               i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_channel->extensions_count, &out_channel->extensions);
            }
            else
            {
               i = cgltf_skip_json(tokens, i+1);
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_animation(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_animation* out_animation)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_animation->name);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "samplers") == 0)
      {
         i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_animation_sampler), (void**)&out_animation->samplers, &out_animation->samplers_count);
         if (i < 0)
         {
            return i;
         }
 
         for (cgltf_size k = 0; k < out_animation->samplers_count; ++k)
         {
            i = cgltf_parse_json_animation_sampler(options, tokens, i, json_chunk, &out_animation->samplers[k]);
            if (i < 0)
            {
               return i;
            }
         }
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "channels") == 0)
      {
         i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_animation_channel), (void**)&out_animation->channels, &out_animation->channels_count);
         if (i < 0)
         {
            return i;
         }
 
         for (cgltf_size k = 0; k < out_animation->channels_count; ++k)
         {
            i = cgltf_parse_json_animation_channel(options, tokens, i, json_chunk, &out_animation->channels[k]);
            if (i < 0)
            {
               return i;
            }
         }
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_animation->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_animation->extensions_count, &out_animation->extensions);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_animations(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_animation), (void**)&out_data->animations, &out_data->animations_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->animations_count; ++j)
   {
      i = cgltf_parse_json_animation(options, tokens, i, json_chunk, &out_data->animations[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_variant(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_material_variant* out_variant)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_variant->name);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_variant->extras);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
static int cgltf_parse_json_variants(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_material_variant), (void**)&out_data->variants, &out_data->variants_count);
   if (i < 0)
   {
      return i;
   }
 
   for (cgltf_size j = 0; j < out_data->variants_count; ++j)
   {
      i = cgltf_parse_json_variant(options, tokens, i, json_chunk, &out_data->variants[j]);
      if (i < 0)
      {
         return i;
      }
   }
   return i;
}
 
static int cgltf_parse_json_asset(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_asset* out_asset)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens+i, json_chunk, "copyright") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_asset->copyright);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "generator") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_asset->generator);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "version") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_asset->version);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "minVersion") == 0)
      {
         i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_asset->min_version);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_asset->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_asset->extensions_count, &out_asset->extensions);
      }
      else
      {
         i = cgltf_skip_json(tokens, i+1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   if (out_asset->version && CGLTF_ATOF(out_asset->version) < 2)
   {
      return CGLTF_ERROR_LEGACY;
   }
 
   return i;
}
 
cgltf_size cgltf_num_components(cgltf_type type) {
   switch (type)
   {
   case cgltf_type_vec2:
      return 2;
   case cgltf_type_vec3:
      return 3;
   case cgltf_type_vec4:
      return 4;
   case cgltf_type_mat2:
      return 4;
   case cgltf_type_mat3:
      return 9;
   case cgltf_type_mat4:
      return 16;
   case cgltf_type_invalid:
   case cgltf_type_scalar:
   default:
      return 1;
   }
}
 
static cgltf_size cgltf_component_size(cgltf_component_type component_type) {
   switch (component_type)
   {
   case cgltf_component_type_r_8:
   case cgltf_component_type_r_8u:
      return 1;
   case cgltf_component_type_r_16:
   case cgltf_component_type_r_16u:
      return 2;
   case cgltf_component_type_r_32u:
   case cgltf_component_type_r_32f:
      return 4;
   case cgltf_component_type_invalid:
   default:
      return 0;
   }
}
 
static cgltf_size cgltf_calc_size(cgltf_type type, cgltf_component_type component_type)
{
   cgltf_size component_size = cgltf_component_size(component_type);
   if (type == cgltf_type_mat2 && component_size == 1)
   {
      return 8 * component_size;
   }
   else if (type == cgltf_type_mat3 && (component_size == 1 || component_size == 2))
   {
      return 12 * component_size;
   }
   return component_size * cgltf_num_components(type);
}
 
static int cgltf_fixup_pointers(cgltf_data* out_data);
 
static int cgltf_parse_json_root(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
   CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
   int size = tokens[i].size;
   ++i;
 
   for (int j = 0; j < size; ++j)
   {
      CGLTF_CHECK_KEY(tokens[i]);
 
      if (cgltf_json_strcmp(tokens + i, json_chunk, "asset") == 0)
      {
         i = cgltf_parse_json_asset(options, tokens, i + 1, json_chunk, &out_data->asset);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "meshes") == 0)
      {
         i = cgltf_parse_json_meshes(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "accessors") == 0)
      {
         i = cgltf_parse_json_accessors(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "bufferViews") == 0)
      {
         i = cgltf_parse_json_buffer_views(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "buffers") == 0)
      {
         i = cgltf_parse_json_buffers(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "materials") == 0)
      {
         i = cgltf_parse_json_materials(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "images") == 0)
      {
         i = cgltf_parse_json_images(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "textures") == 0)
      {
         i = cgltf_parse_json_textures(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "samplers") == 0)
      {
         i = cgltf_parse_json_samplers(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "skins") == 0)
      {
         i = cgltf_parse_json_skins(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "cameras") == 0)
      {
         i = cgltf_parse_json_cameras(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "nodes") == 0)
      {
         i = cgltf_parse_json_nodes(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "scenes") == 0)
      {
         i = cgltf_parse_json_scenes(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "scene") == 0)
      {
         ++i;
         out_data->scene = CGLTF_PTRINDEX(cgltf_scene, cgltf_json_to_int(tokens + i, json_chunk));
         ++i;
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "animations") == 0)
      {
         i = cgltf_parse_json_animations(options, tokens, i + 1, json_chunk, out_data);
      }
      else if (cgltf_json_strcmp(tokens+i, json_chunk, "extras") == 0)
      {
         i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_data->extras);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
      {
         ++i;
 
         CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
         if(out_data->data_extensions)
         {
            return CGLTF_ERROR_JSON;
         }
 
         int extensions_size = tokens[i].size;
         out_data->data_extensions_count = 0;
         out_data->data_extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
 
         if (!out_data->data_extensions)
         {
            return CGLTF_ERROR_NOMEM;
         }
 
         ++i;
 
         for (int k = 0; k < extensions_size; ++k)
         {
            CGLTF_CHECK_KEY(tokens[i]);
 
            if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_lights_punctual") == 0)
            {
               ++i;
 
               CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
               int data_size = tokens[i].size;
               ++i;
 
               for (int m = 0; m < data_size; ++m)
               {
                  CGLTF_CHECK_KEY(tokens[i]);
 
                  if (cgltf_json_strcmp(tokens + i, json_chunk, "lights") == 0)
                  {
                     i = cgltf_parse_json_lights(options, tokens, i + 1, json_chunk, out_data);
                  }
                  else
                  {
                     i = cgltf_skip_json(tokens, i + 1);
                  }
 
                  if (i < 0)
                  {
                     return i;
                  }
               }
            }
            else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_variants") == 0)
            {
               ++i;
 
               CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
               int data_size = tokens[i].size;
               ++i;
 
               for (int m = 0; m < data_size; ++m)
               {
                  CGLTF_CHECK_KEY(tokens[i]);
 
                  if (cgltf_json_strcmp(tokens + i, json_chunk, "variants") == 0)
                  {
                     i = cgltf_parse_json_variants(options, tokens, i + 1, json_chunk, out_data);
                  }
                  else
                  {
                     i = cgltf_skip_json(tokens, i + 1);
                  }
 
                  if (i < 0)
                  {
                     return i;
                  }
               }
            }
            else
            {
               i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_data->data_extensions[out_data->data_extensions_count++]));
            }
 
            if (i < 0)
            {
               return i;
            }
         }
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensionsUsed") == 0)
      {
         i = cgltf_parse_json_string_array(options, tokens, i + 1, json_chunk, &out_data->extensions_used, &out_data->extensions_used_count);
      }
      else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensionsRequired") == 0)
      {
         i = cgltf_parse_json_string_array(options, tokens, i + 1, json_chunk, &out_data->extensions_required, &out_data->extensions_required_count);
      }
      else
      {
         i = cgltf_skip_json(tokens, i + 1);
      }
 
      if (i < 0)
      {
         return i;
      }
   }
 
   return i;
}
 
cgltf_result cgltf_parse_json(cgltf_options* options, const uint8_t* json_chunk, cgltf_size size, cgltf_data** out_data)
{
   jsmn_parser parser = { 0, 0, 0 };
 
   if (options->json_token_count == 0)
   {
      int token_count = jsmn_parse(&parser, (const char*)json_chunk, size, NULL, 0);
 
      if (token_count <= 0)
      {
         return cgltf_result_invalid_json;
      }
 
      options->json_token_count = token_count;
   }
 
   jsmntok_t* tokens = (jsmntok_t*)options->memory.alloc_func(options->memory.user_data, sizeof(jsmntok_t) * (options->json_token_count + 1));
 
   if (!tokens)
   {
      return cgltf_result_out_of_memory;
   }
 
   jsmn_init(&parser);
 
   int token_count = jsmn_parse(&parser, (const char*)json_chunk, size, tokens, options->json_token_count);
 
   if (token_count <= 0)
   {
      options->memory.free_func(options->memory.user_data, tokens);
      return cgltf_result_invalid_json;
   }
 
   // this makes sure that we always have an UNDEFINED token at the end of the stream
   // for invalid JSON inputs this makes sure we don't perform out of bound reads of token data
   tokens[token_count].type = JSMN_UNDEFINED;
 
   cgltf_data* data = (cgltf_data*)options->memory.alloc_func(options->memory.user_data, sizeof(cgltf_data));
 
   if (!data)
   {
      options->memory.free_func(options->memory.user_data, tokens);
      return cgltf_result_out_of_memory;
   }
 
   memset(data, 0, sizeof(cgltf_data));
   data->memory = options->memory;
   data->file = options->file;
 
   int i = cgltf_parse_json_root(options, tokens, 0, json_chunk, data);
 
   options->memory.free_func(options->memory.user_data, tokens);
 
   if (i < 0)
   {
      cgltf_free(data);
 
      switch (i)
      {
      case CGLTF_ERROR_NOMEM: return cgltf_result_out_of_memory;
      case CGLTF_ERROR_LEGACY: return cgltf_result_legacy_gltf;
      default: return cgltf_result_invalid_gltf;
      }
   }
 
   if (cgltf_fixup_pointers(data) < 0)
   {
      cgltf_free(data);
      return cgltf_result_invalid_gltf;
   }
 
   data->json = (const char*)json_chunk;
   data->json_size = size;
 
   *out_data = data;
 
   return cgltf_result_success;
}
 
static int cgltf_fixup_pointers(cgltf_data* data)
{
   for (cgltf_size i = 0; i < data->meshes_count; ++i)
   {
      for (cgltf_size j = 0; j < data->meshes[i].primitives_count; ++j)
      {
         CGLTF_PTRFIXUP(data->meshes[i].primitives[j].indices, data->accessors, data->accessors_count);
         CGLTF_PTRFIXUP(data->meshes[i].primitives[j].material, data->materials, data->materials_count);
 
         for (cgltf_size k = 0; k < data->meshes[i].primitives[j].attributes_count; ++k)
         {
            CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].attributes[k].data, data->accessors, data->accessors_count);
         }
 
         for (cgltf_size k = 0; k < data->meshes[i].primitives[j].targets_count; ++k)
         {
            for (cgltf_size m = 0; m < data->meshes[i].primitives[j].targets[k].attributes_count; ++m)
            {
               CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].targets[k].attributes[m].data, data->accessors, data->accessors_count);
            }
         }
 
         if (data->meshes[i].primitives[j].has_draco_mesh_compression)
         {
            CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].draco_mesh_compression.buffer_view, data->buffer_views, data->buffer_views_count);
            for (cgltf_size m = 0; m < data->meshes[i].primitives[j].draco_mesh_compression.attributes_count; ++m)
            {
               CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].draco_mesh_compression.attributes[m].data, data->accessors, data->accessors_count);
            }
         }
 
         for (cgltf_size k = 0; k < data->meshes[i].primitives[j].mappings_count; ++k)
         {
            CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].mappings[k].material, data->materials, data->materials_count);
         }
      }
   }
 
   for (cgltf_size i = 0; i < data->accessors_count; ++i)
   {
      CGLTF_PTRFIXUP(data->accessors[i].buffer_view, data->buffer_views, data->buffer_views_count);
 
      if (data->accessors[i].is_sparse)
      {
         CGLTF_PTRFIXUP_REQ(data->accessors[i].sparse.indices_buffer_view, data->buffer_views, data->buffer_views_count);
         CGLTF_PTRFIXUP_REQ(data->accessors[i].sparse.values_buffer_view, data->buffer_views, data->buffer_views_count);
      }
 
      if (data->accessors[i].buffer_view)
      {
         data->accessors[i].stride = data->accessors[i].buffer_view->stride;
      }
 
      if (data->accessors[i].stride == 0)
      {
         data->accessors[i].stride = cgltf_calc_size(data->accessors[i].type, data->accessors[i].component_type);
      }
   }
 
   for (cgltf_size i = 0; i < data->textures_count; ++i)
   {
      CGLTF_PTRFIXUP(data->textures[i].image, data->images, data->images_count);
      CGLTF_PTRFIXUP(data->textures[i].basisu_image, data->images, data->images_count);
      CGLTF_PTRFIXUP(data->textures[i].sampler, data->samplers, data->samplers_count);
   }
 
   for (cgltf_size i = 0; i < data->images_count; ++i)
   {
      CGLTF_PTRFIXUP(data->images[i].buffer_view, data->buffer_views, data->buffer_views_count);
   }
 
   for (cgltf_size i = 0; i < data->materials_count; ++i)
   {
      CGLTF_PTRFIXUP(data->materials[i].normal_texture.texture, data->textures, data->textures_count);
      CGLTF_PTRFIXUP(data->materials[i].emissive_texture.texture, data->textures, data->textures_count);
      CGLTF_PTRFIXUP(data->materials[i].occlusion_texture.texture, data->textures, data->textures_count);
 
      CGLTF_PTRFIXUP(data->materials[i].pbr_metallic_roughness.base_color_texture.texture, data->textures, data->textures_count);
      CGLTF_PTRFIXUP(data->materials[i].pbr_metallic_roughness.metallic_roughness_texture.texture, data->textures, data->textures_count);
 
      CGLTF_PTRFIXUP(data->materials[i].pbr_specular_glossiness.diffuse_texture.texture, data->textures, data->textures_count);
      CGLTF_PTRFIXUP(data->materials[i].pbr_specular_glossiness.specular_glossiness_texture.texture, data->textures, data->textures_count);
 
      CGLTF_PTRFIXUP(data->materials[i].clearcoat.clearcoat_texture.texture, data->textures, data->textures_count);
      CGLTF_PTRFIXUP(data->materials[i].clearcoat.clearcoat_roughness_texture.texture, data->textures, data->textures_count);
      CGLTF_PTRFIXUP(data->materials[i].clearcoat.clearcoat_normal_texture.texture, data->textures, data->textures_count);
 
      CGLTF_PTRFIXUP(data->materials[i].specular.specular_texture.texture, data->textures, data->textures_count);
      CGLTF_PTRFIXUP(data->materials[i].specular.specular_color_texture.texture, data->textures, data->textures_count);
 
      CGLTF_PTRFIXUP(data->materials[i].transmission.transmission_texture.texture, data->textures, data->textures_count);
 
      CGLTF_PTRFIXUP(data->materials[i].volume.thickness_texture.texture, data->textures, data->textures_count);
 
      CGLTF_PTRFIXUP(data->materials[i].sheen.sheen_color_texture.texture, data->textures, data->textures_count);
      CGLTF_PTRFIXUP(data->materials[i].sheen.sheen_roughness_texture.texture, data->textures, data->textures_count);
 
      CGLTF_PTRFIXUP(data->materials[i].iridescence.iridescence_texture.texture, data->textures, data->textures_count);
      CGLTF_PTRFIXUP(data->materials[i].iridescence.iridescence_thickness_texture.texture, data->textures, data->textures_count);
   }
 
   for (cgltf_size i = 0; i < data->buffer_views_count; ++i)
   {
      CGLTF_PTRFIXUP_REQ(data->buffer_views[i].buffer, data->buffers, data->buffers_count);
 
      if (data->buffer_views[i].has_meshopt_compression)
      {
         CGLTF_PTRFIXUP_REQ(data->buffer_views[i].meshopt_compression.buffer, data->buffers, data->buffers_count);
      }
   }
 
   for (cgltf_size i = 0; i < data->skins_count; ++i)
   {
      for (cgltf_size j = 0; j < data->skins[i].joints_count; ++j)
      {
         CGLTF_PTRFIXUP_REQ(data->skins[i].joints[j], data->nodes, data->nodes_count);
      }
 
      CGLTF_PTRFIXUP(data->skins[i].skeleton, data->nodes, data->nodes_count);
      CGLTF_PTRFIXUP(data->skins[i].inverse_bind_matrices, data->accessors, data->accessors_count);
   }
 
   for (cgltf_size i = 0; i < data->nodes_count; ++i)
   {
      for (cgltf_size j = 0; j < data->nodes[i].children_count; ++j)
      {
         CGLTF_PTRFIXUP_REQ(data->nodes[i].children[j], data->nodes, data->nodes_count);
 
         if (data->nodes[i].children[j]->parent)
         {
            return CGLTF_ERROR_JSON;
         }
 
         data->nodes[i].children[j]->parent = &data->nodes[i];
      }
 
      CGLTF_PTRFIXUP(data->nodes[i].mesh, data->meshes, data->meshes_count);
      CGLTF_PTRFIXUP(data->nodes[i].skin, data->skins, data->skins_count);
      CGLTF_PTRFIXUP(data->nodes[i].camera, data->cameras, data->cameras_count);
      CGLTF_PTRFIXUP(data->nodes[i].light, data->lights, data->lights_count);
 
      if (data->nodes[i].has_mesh_gpu_instancing)
      {
         CGLTF_PTRFIXUP_REQ(data->nodes[i].mesh_gpu_instancing.buffer_view, data->buffer_views, data->buffer_views_count);
         for (cgltf_size m = 0; m < data->nodes[i].mesh_gpu_instancing.attributes_count; ++m)
         {
            CGLTF_PTRFIXUP_REQ(data->nodes[i].mesh_gpu_instancing.attributes[m].data, data->accessors, data->accessors_count);
         }
      }
   }
 
   for (cgltf_size i = 0; i < data->scenes_count; ++i)
   {
      for (cgltf_size j = 0; j < data->scenes[i].nodes_count; ++j)
      {
         CGLTF_PTRFIXUP_REQ(data->scenes[i].nodes[j], data->nodes, data->nodes_count);
 
         if (data->scenes[i].nodes[j]->parent)
         {
            return CGLTF_ERROR_JSON;
         }
      }
   }
 
   CGLTF_PTRFIXUP(data->scene, data->scenes, data->scenes_count);
 
   for (cgltf_size i = 0; i < data->animations_count; ++i)
   {
      for (cgltf_size j = 0; j < data->animations[i].samplers_count; ++j)
      {
         CGLTF_PTRFIXUP_REQ(data->animations[i].samplers[j].input, data->accessors, data->accessors_count);
         CGLTF_PTRFIXUP_REQ(data->animations[i].samplers[j].output, data->accessors, data->accessors_count);
      }
 
      for (cgltf_size j = 0; j < data->animations[i].channels_count; ++j)
      {
         CGLTF_PTRFIXUP_REQ(data->animations[i].channels[j].sampler, data->animations[i].samplers, data->animations[i].samplers_count);
         CGLTF_PTRFIXUP(data->animations[i].channels[j].target_node, data->nodes, data->nodes_count);
      }
   }
 
   return 0;
}
 
/*
 * -- jsmn.c start --
 * Source: https://github.com/zserge/jsmn
 * License: MIT
 *
 * Copyright (c) 2010 Serge A. Zaitsev
 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
 
static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser,
               jsmntok_t *tokens, size_t num_tokens) {
   jsmntok_t *tok;
   if (parser->toknext >= num_tokens) {
      return NULL;
   }
   tok = &tokens[parser->toknext++];
   tok->start = tok->end = -1;
   tok->size = 0;
#ifdef JSMN_PARENT_LINKS
   tok->parent = -1;
#endif
   return tok;
}
 
static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type,
            int start, int end) {
   token->type = type;
   token->start = start;
   token->end = end;
   token->size = 0;
}
 
static int jsmn_parse_primitive(jsmn_parser *parser, const char *js,
            size_t len, jsmntok_t *tokens, size_t num_tokens) {
   jsmntok_t *token;
   int start;
 
   start = parser->pos;
 
   for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
      switch (js[parser->pos]) {
#ifndef JSMN_STRICT
      /* In strict mode primitive must be followed by "," or "}" or "]" */
      case ':':
#endif
      case '\t' : case '\r' : case '\n' : case ' ' :
      case ','  : case ']'  : case '}' :
         goto found;
      }
      if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
         parser->pos = start;
         return JSMN_ERROR_INVAL;
      }
   }
#ifdef JSMN_STRICT
   /* In strict mode primitive must be followed by a comma/object/array */
   parser->pos = start;
   return JSMN_ERROR_PART;
#endif
 
found:
   if (tokens == NULL) {
      parser->pos--;
      return 0;
   }
   token = jsmn_alloc_token(parser, tokens, num_tokens);
   if (token == NULL) {
      parser->pos = start;
      return JSMN_ERROR_NOMEM;
   }
   jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
#ifdef JSMN_PARENT_LINKS
   token->parent = parser->toksuper;
#endif
   parser->pos--;
   return 0;
}
 
static int jsmn_parse_string(jsmn_parser *parser, const char *js,
             size_t len, jsmntok_t *tokens, size_t num_tokens) {
   jsmntok_t *token;
 
   int start = parser->pos;
 
   parser->pos++;
 
   /* Skip starting quote */
   for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
      char c = js[parser->pos];
 
      /* Quote: end of string */
      if (c == '\"') {
         if (tokens == NULL) {
            return 0;
         }
         token = jsmn_alloc_token(parser, tokens, num_tokens);
         if (token == NULL) {
            parser->pos = start;
            return JSMN_ERROR_NOMEM;
         }
         jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos);
#ifdef JSMN_PARENT_LINKS
         token->parent = parser->toksuper;
#endif
         return 0;
      }
 
      /* Backslash: Quoted symbol expected */
      if (c == '\\' && parser->pos + 1 < len) {
         int i;
         parser->pos++;
         switch (js[parser->pos]) {
         /* Allowed escaped symbols */
         case '\"': case '/' : case '\\' : case 'b' :
         case 'f' : case 'r' : case 'n'  : case 't' :
            break;
            /* Allows escaped symbol \uXXXX */
         case 'u':
            parser->pos++;
            for(i = 0; i < 4 && parser->pos < len && js[parser->pos] != '\0'; i++) {
               /* If it isn't a hex character we have an error */
               if(!((js[parser->pos] >= 48 && js[parser->pos] <= 57) || /* 0-9 */
                   (js[parser->pos] >= 65 && js[parser->pos] <= 70) || /* A-F */
                   (js[parser->pos] >= 97 && js[parser->pos] <= 102))) { /* a-f */
                  parser->pos = start;
                  return JSMN_ERROR_INVAL;
               }
               parser->pos++;
            }
            parser->pos--;
            break;
            /* Unexpected symbol */
         default:
            parser->pos = start;
            return JSMN_ERROR_INVAL;
         }
      }
   }
   parser->pos = start;
   return JSMN_ERROR_PART;
}
 
static int jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
         jsmntok_t *tokens, size_t num_tokens) {
   int r;
   int i;
   jsmntok_t *token;
   int count = parser->toknext;
 
   for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
      char c;
      jsmntype_t type;
 
      c = js[parser->pos];
      switch (c) {
      case '{': case '[':
         count++;
         if (tokens == NULL) {
            break;
         }
         token = jsmn_alloc_token(parser, tokens, num_tokens);
         if (token == NULL)
            return JSMN_ERROR_NOMEM;
         if (parser->toksuper != -1) {
            tokens[parser->toksuper].size++;
#ifdef JSMN_PARENT_LINKS
            token->parent = parser->toksuper;
#endif
         }
         token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
         token->start = parser->pos;
         parser->toksuper = parser->toknext - 1;
         break;
      case '}': case ']':
         if (tokens == NULL)
            break;
         type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
#ifdef JSMN_PARENT_LINKS
         if (parser->toknext < 1) {
            return JSMN_ERROR_INVAL;
         }
         token = &tokens[parser->toknext - 1];
         for (;;) {
            if (token->start != -1 && token->end == -1) {
               if (token->type != type) {
                  return JSMN_ERROR_INVAL;
               }
               token->end = parser->pos + 1;
               parser->toksuper = token->parent;
               break;
            }
            if (token->parent == -1) {
               if(token->type != type || parser->toksuper == -1) {
                  return JSMN_ERROR_INVAL;
               }
               break;
            }
            token = &tokens[token->parent];
         }
#else
         for (i = parser->toknext - 1; i >= 0; i--) {
            token = &tokens[i];
            if (token->start != -1 && token->end == -1) {
               if (token->type != type) {
                  return JSMN_ERROR_INVAL;
               }
               parser->toksuper = -1;
               token->end = parser->pos + 1;
               break;
            }
         }
         /* Error if unmatched closing bracket */
         if (i == -1) return JSMN_ERROR_INVAL;
         for (; i >= 0; i--) {
            token = &tokens[i];
            if (token->start != -1 && token->end == -1) {
               parser->toksuper = i;
               break;
            }
         }
#endif
         break;
      case '\"':
         r = jsmn_parse_string(parser, js, len, tokens, num_tokens);
         if (r < 0) return r;
         count++;
         if (parser->toksuper != -1 && tokens != NULL)
            tokens[parser->toksuper].size++;
         break;
      case '\t' : case '\r' : case '\n' : case ' ':
         break;
      case ':':
         parser->toksuper = parser->toknext - 1;
         break;
      case ',':
         if (tokens != NULL && parser->toksuper != -1 &&
               tokens[parser->toksuper].type != JSMN_ARRAY &&
               tokens[parser->toksuper].type != JSMN_OBJECT) {
#ifdef JSMN_PARENT_LINKS
            parser->toksuper = tokens[parser->toksuper].parent;
#else
            for (i = parser->toknext - 1; i >= 0; i--) {
               if (tokens[i].type == JSMN_ARRAY || tokens[i].type == JSMN_OBJECT) {
                  if (tokens[i].start != -1 && tokens[i].end == -1) {
                     parser->toksuper = i;
                     break;
                  }
               }
            }
#endif
         }
         break;
#ifdef JSMN_STRICT
         /* In strict mode primitives are: numbers and booleans */
      case '-': case '0': case '1' : case '2': case '3' : case '4':
      case '5': case '6': case '7' : case '8': case '9':
      case 't': case 'f': case 'n' :
         /* And they must not be keys of the object */
         if (tokens != NULL && parser->toksuper != -1) {
            jsmntok_t *t = &tokens[parser->toksuper];
            if (t->type == JSMN_OBJECT ||
                  (t->type == JSMN_STRING && t->size != 0)) {
               return JSMN_ERROR_INVAL;
            }
         }
#else
         /* In non-strict mode every unquoted value is a primitive */
      default:
#endif
         r = jsmn_parse_primitive(parser, js, len, tokens, num_tokens);
         if (r < 0) return r;
         count++;
         if (parser->toksuper != -1 && tokens != NULL)
            tokens[parser->toksuper].size++;
         break;
 
#ifdef JSMN_STRICT
         /* Unexpected char in strict mode */
      default:
         return JSMN_ERROR_INVAL;
#endif
      }
   }
 
   if (tokens != NULL) {
      for (i = parser->toknext - 1; i >= 0; i--) {
         /* Unmatched opened object or array */
         if (tokens[i].start != -1 && tokens[i].end == -1) {
            return JSMN_ERROR_PART;
         }
      }
   }
 
   return count;
}
 
static void jsmn_init(jsmn_parser *parser) {
   parser->pos = 0;
   parser->toknext = 0;
   parser->toksuper = -1;
}
/*
 * -- jsmn.c end --
 */
 
#endif /* #ifdef CGLTF_IMPLEMENTATION */
 
/* cgltf is distributed under MIT license:
 *
 * Copyright (c) 2018-2021 Johannes Kuhlmann
 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */