opengl.h

/*
 * See Licensing and Copyright notice in naev.h
 */
#pragma once
 
#include <stdint.h>
 
/* Include header generated by glad */
#include "glad.h"
 
#include "SDL.h"
#include "colour.h"
/* We put all the other opengl stuff here to only have to include one header.  */
#include "opengl_render.h"
#include "opengl_shader.h"
#include "opengl_tex.h"
#include "opengl_vbo.h"
#include "mat4.h"
#include "shaders.gen.h"
 
#define OPENGL_NUM_FBOS    4 
/*
 * Contains info about the opengl screen
 */
#define OPENGL_DOUBLEBUF   (1<<1) 
#define OPENGL_VSYNC       (1<<2) 
#define OPENGL_SUBROUTINES (1<<3) 
#define gl_has(f)    (gl_screen.flags & (f)) 
typedef struct glInfo_ {
   int x; 
   int y; 
   /* Viewport considers x/y offset. */
   int w; 
   int h; 
   /* Scaled window is the effective window resolution without considering offsets. */
   int nw; 
   int nh; 
   /* Real window resolution is the real window resolution, unscaled and without offsets. */
   int rw; 
   int rh; 
   double scale; 
   double wscale; 
   double hscale; 
   double dwscale; 
   double dhscale; 
   double mxscale; 
   double myscale; 
   int depth; 
   int r; 
   int g; 
   int b; 
   int a; 
   unsigned int flags; 
   int tex_max; 
   int multitex_max; 
   int fsaa; 
   SDL_Window *window; 
   SDL_GLContext context; 
   GLuint current_fbo; 
   GLuint fbo[OPENGL_NUM_FBOS]; 
   GLuint fbo_tex[OPENGL_NUM_FBOS]; 
} glInfo;
extern glInfo gl_screen; /* local structure set with gl_init and co */
 
extern mat4 gl_view_matrix;
 
#define  SCREEN_X gl_screen.x 
#define  SCREEN_Y gl_screen.y 
#define  SCREEN_W gl_screen.w 
#define  SCREEN_H gl_screen.h 
/*
 * used with colour.h
 */
#define COLOUR(x)    glColour4d((x).r,(x).g,(x).b,(x).a) 
#define ACOLOUR(x,a) glColour4d((x).r,(x).g,(x).b,a) 
/*
 * initialization / cleanup
 */
int gl_init (void);
void gl_exit (void);
void gl_resize (void);
 
/*
 * Extensions and version.
 */
GLboolean gl_hasVersion( int major, int minor );
 
/*
 * Viewport.
 */
void gl_windowToScreenPos( int *sx, int *sy, int wx, int wy );
void gl_screenToWindowPos( int *wx, int *wy, int sx, int sy );
void gl_viewport( int x, int y, int w, int h );
void gl_defViewport (void);
void gl_setDefViewport( int x, int y, int w, int h );
int gl_setupFullscreen (void);
 
/*
 * misc
 */
void gl_colourblind( int enable );
GLint gl_stringToFilter( const char *s );
GLint gl_stringToClamp( const char *s );
void gl_screenshot( const char *filename );
#ifdef DEBUGGING
#define gl_checkErr()   gl_checkHandleError( __func__, __LINE__ )
void gl_checkHandleError( const char *func, int line );
#else /* DEBUGGING */
#define gl_checkErr() 
#endif /* DEBUGGING */