dialogue.c

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/*
 * See Licensing and Copyright notice in naev.h
 */
#include <stdarg.h>
#include <stdlib.h>
 
#include "naev.h"
#include "dialogue.h"
 
#include "input.h"
#include "log.h"
#include "conf.h"
#include "menu.h"
#include "ndata.h"
#include "nstring.h"
#include "opengl.h"
#include "pause.h"
#include "toolkit.h"
 
static int dialogue_open; 
static int dlgid  = 0; 
/*
 * Custom widget scary stuff.
 */
typedef struct dialogue_update_s {
   unsigned int wid;
   int (*update)(double, void*);
   void *data;
} dialogue_update_t;
struct dialogue_custom_data_s {
   int (*event)(unsigned int, SDL_Event*, void*);
   void *data;
   int mx;
   int my;
   int w;
   int h;
   int last_w;
   int last_h;
};
static int dialogue_custom_event( unsigned int wid, SDL_Event *event );
 
/*
 * Prototypes.
 */
/* extern */
extern void main_loop( int nested ); /* from naev.c */
/* generic */
static void dialogue_close( unsigned int wid, const char *str );
static void dialogue_cancel( unsigned int wid, const char *str );
/* dialogues */
static glFont* dialogue_getSize( const char* title,
      const char* msg, int* width, int* height );
static void dialogue_YesNoClose( unsigned int wid, const char *str );
static void dialogue_inputClose( unsigned int wid, const char *str );
static void dialogue_choiceClose( unsigned int wid, const char *str );
static void dialogue_listClose( unsigned int wid, const char *str );
static void dialogue_listCancel( unsigned int wid, const char *str );
/* secondary loop hack */
static int toolkit_loop( int *loop_done, dialogue_update_t *du );
 
typedef struct InputDialogue_ {
   unsigned int input_wid; 
   int x; 
   int y; 
   int w; 
   int h; 
   void (*item_select_cb) (unsigned int wid, const char* wgtname,
                           int x, int y, int w, int h
        ); 
} InputDialogue;
static void select_call_wrapper(unsigned int wid, const char* wgtname);
 
int dialogue_isOpen (void)
{
   return !!dialogue_open;
}
 
static void dialogue_close( unsigned int wid, const char *str )
{
   (void) str;
   int *loop_done;
   loop_done = window_getData( wid );
   window_destroy( wid );
   *loop_done = 1;
}
 
static void dialogue_cancel( unsigned int wid, const char *str )
{
   (void) str;
   int *loop_done;
   loop_done = window_getData( wid );
   window_destroy( wid );
   *loop_done = -1;
}
 
void dialogue_alert( const char *fmt, ... )
{
   char msg[STRMAX_SHORT];
   va_list ap;
 
   if (fmt == NULL)
      return;
   va_start(ap, fmt);
   vsnprintf(msg, sizeof(msg), fmt, ap);
   va_end(ap);
 
   dialogue_alertRaw( msg );
}
 
void dialogue_alertRaw( const char *msg )
{
   int w,h;
   unsigned int msg_wid;
   int done;
   const char *caption = _("Warning");
   glFont *font = dialogue_getSize( caption, msg, &w, &h );
 
   /* create the window, can't reuse dialogue_msg since we need to have a
    * different window name. */
   msg_wid = window_create( "dlgAlert", caption, -1, -1, w, 110 + h );
   window_setData( msg_wid, &done );
   window_addText( msg_wid, 20, -40, w-40, h, 0, "txtMsg",
         font, NULL, msg );
   window_addButton( msg_wid, (w-50)/2, 20, 50, 30, "btnOK", _("OK"),
         dialogue_close );
 
   toolkit_loop( &done, NULL );
}
 
static glFont* dialogue_getSize( const char* title,
      const char* msg, int* width, int* height )
{
   glFont* font;
   double w, h, d;
   int i, titlelen, msglen;
 
   /* Get title length. */
   titlelen = gl_printWidthRaw( &gl_defFont, title );
   msglen = gl_printWidthRaw( &gl_defFont, msg );
 
   /* Try widths from 300 to 800 in 50 px increments.
    * Each subsequent width gets an additional line, following this table:
    *
    *    300 px:  2 lines,  540 px total
    *    350 px:  3 lines,  930 px total
    *    ...
    *    800 px: 12 lines, 9600 px total
    */
   for (i=0; i<11; i++)
      if (msglen < (260 + i * 50) * (2 + i))
         break;
 
   w = 300 + i * 50;
   w = MAX(w, titlelen+40); /* Expand width if the title is long. */
 
   /* Now we look at proportion. */
   font = &gl_defFont;
   h = gl_printHeightRaw( font, w-40, msg );
 
   d = ((double)w/(double)h)*(3./4.); /* deformation factor. */
   if (FABS(d) > 0.3) {
      if (h > w)
         w = h;
      h = gl_printHeightRaw( font, w-40, msg );
   }
 
   /* Set values. */
   (*width) = w;
   (*height) = h;
 
   return font;
}
 
void dialogue_msg( const char* caption, const char *fmt, ... )
{
   char msg[STRMAX];
   va_list ap;
 
   if (fmt == NULL)
      return;
   va_start(ap, fmt);
   vsnprintf(msg, sizeof(msg), fmt, ap);
   va_end(ap);
 
   dialogue_msgRaw( caption, msg );
}
 
void dialogue_msgImg( const char* caption, const char *img, const char *fmt, ... )
{
   char msg[STRMAX];
   va_list ap;
 
   if (fmt == NULL)
      return;
   va_start(ap, fmt);
   vsnprintf(msg, sizeof(msg), fmt, ap);
   va_end(ap);
 
   dialogue_msgImgRaw( caption, msg, img, -1, -1 );
}
 
void dialogue_msgRaw( const char* caption, const char *msg )
{
   int w,h;
   unsigned int msg_wid;
   int done;
   glFont *font = dialogue_getSize( caption, msg, &w, &h );
 
   /* create the window */
   msg_wid = window_create( "dlgMsg", caption, -1, -1, w, 110 + h );
   window_setData( msg_wid, &done );
   window_addText( msg_wid, 20, -40, w-40, h, 0, "txtMsg",
         font, NULL, msg );
   window_addButton( msg_wid, (w-50)/2, 20, 50, 30, "btnOK", _("OK"),
         dialogue_close );
 
   toolkit_loop( &done, NULL );
}
 
void dialogue_msgImgRaw( const char* caption, const char *msg, const char *img, int width, int height )
{
   int w, h, img_width, img_height;
   glFont* font;
   unsigned int msg_wid;
   int done;
   glTexture *gfx;
   char buf[PATH_MAX];
 
   /* Get the desired texture */
   /* IMPORTANT : texture must not be freed here, it will be freed when the widget closes */
   snprintf( buf, sizeof(buf), "%s%s", GFX_PATH, img );
   gfx = gl_newImage( buf, 0 );
   if (gfx == NULL)
      return;
 
   /* Find the popup's dimensions from text and image */
   img_width  = (width < 0)  ? gfx->w : width;
   img_height = (height < 0) ? gfx->h : height;
   font = dialogue_getSize( caption, msg, &w, &h );
   if (h < img_width) {
      h = img_width;
   }
 
   /* Create the window */
   msg_wid = window_create( "dlgMsgImg", caption, -1, -1, img_width + w, 110 + h );
   window_setData( msg_wid, &done );
 
   /* Add the text box */
   window_addText( msg_wid, img_width+40, -40, w-40, h,  0, "txtMsg",
         font, NULL, msg );
 
   /* Add a placeholder rectangle for the image */
   window_addRect( msg_wid, 20, -40, img_width, img_height,
         "rctGFX", &cGrey10, 1 );
 
   /* Actually add the texture in the rectangle */
   window_addImage( msg_wid, 20, -40, img_width, img_height,
         "ImgGFX", gfx, 0 );
 
   /* Add the OK button */
   window_addButton( msg_wid, (img_width+w -50)/2, 20, 50, 30, "btnOK", _("OK"),
         dialogue_close );
 
   toolkit_loop( &done, NULL );
}
 
int dialogue_YesNo( const char* caption, const char *fmt, ... )
{
   char msg[STRMAX];
   va_list ap;
 
   if (fmt == NULL)
      return -1;
   va_start(ap, fmt);
   vsnprintf(msg, sizeof(msg), fmt, ap);
   va_end(ap);
 
   return dialogue_YesNoRaw( caption, msg );
}
 
int dialogue_YesNoRaw( const char* caption, const char *msg )
{
   unsigned int wid;
   int w,h;
   int done[2];
   char buf[STRMAX_SHORT];
   glFont *font = dialogue_getSize( caption, msg, &w, &h );
 
   /* create window */
   snprintf( buf, sizeof(buf), "dlgYesNo%d", ++dlgid );
   wid = window_create( buf, caption, -1, -1, w, h+110 );
   window_setData( wid, &done );
   /* text */
   window_addText( wid, 20, -40, w-40, h,  0, "txtYesNo",
         font, NULL, msg );
   /* buttons */
   window_addButtonKey( wid, w/2-100-10, 20, 100, 30, "btnYes", _("Yes"),
         dialogue_YesNoClose, SDLK_y );
   window_addButtonKey( wid, w/2+10, 20, 100, 30, "btnNo", _("No"),
         dialogue_YesNoClose, SDLK_n );
 
   /* tricky secondary loop */
   done[1] = -1; /* Default to negative. */
   toolkit_loop( done, NULL );
 
   /* Close the dialogue. */
   dialogue_close( wid, NULL );
 
   /* return the result */
   return done[1];
}
static void dialogue_YesNoClose( unsigned int wid, const char *str )
{
   int *loop_done, result;
 
   /* store the result */
   if (strcmp(str,"btnYes")==0)
      result = 1;
   else if (strcmp(str,"btnNo")==0)
      result = 0;
   else {
      WARN(_("Unknown button clicked in YesNo dialogue!"));
      result = 1;
   }
 
   /* set data. */
   loop_done = window_getData( wid );
   loop_done[0] = 1;
   loop_done[1] = result;
}
 
static InputDialogue input_dialogue; 
char* dialogue_input( const char* title, int min, int max, const char *fmt, ... )
{
   char msg[STRMAX];
   va_list ap;
 
   if (input_dialogue.input_wid)
      return NULL;
 
   if (fmt == NULL)
      return NULL;
   va_start(ap, fmt);
   vsnprintf(msg, sizeof(msg), fmt, ap);
   va_end(ap);
 
   return dialogue_inputRaw( title, min, max, msg );
}
 
char* dialogue_inputRaw( const char* title, int min, int max, const char *msg )
{
   char *input;
   int w, h, done;
   glFont* font;
 
   /* get text height */
   font  = dialogue_getSize( title, msg, &w, &h );
   h     = gl_printHeightRaw( font, w, msg );
 
   /* create window */
   input_dialogue.input_wid = window_create( "dlgInput", title, -1, -1, w+40, h+140 );
   window_setData( input_dialogue.input_wid, &done );
   window_setAccept( input_dialogue.input_wid, dialogue_inputClose );
   window_setCancel( input_dialogue.input_wid, dialogue_cancel );
   /* text */
   window_addText( input_dialogue.input_wid, 20, -30, w, h,  0, "txtInput",
         font, NULL, msg );
   /* input */
   window_addInput( input_dialogue.input_wid, 20, 20+30+10, w, 30,"inpInput", max, 1, NULL );
   /* Illegal characters on Linux FS: : */
   /* Illegal characters on Windows FS: < > : " / \ | ? * */
   window_setInputFilter( input_dialogue.input_wid, "inpInput", "/:<>\"\\|?*" ); /* Remove illegal stuff. */
   /* button */
   window_addButton( input_dialogue.input_wid, -20, 20, 80, 30,
         "btnClose", _("Done"), dialogue_inputClose );
 
   /* tricky secondary loop */
   done  = 0;
   input = NULL;
   while ((done >= 0) && (!input ||
         ((int)strlen(input) < min))) { /* must be longer than min */
 
      if (input) {
         dialogue_alert( n_(
                  "Input must be at least %d character long!",
                  "Input must be at least %d characters long!", min),
               min );
         free(input);
         input = NULL;
      }
 
      if (toolkit_loop( &done, NULL ) != 0) { /* error in loop -> quit */
         return NULL;
      }
 
      /* save the input */
      if (done < 0)
         input = NULL;
      else
         input = strdup(window_getInput(input_dialogue.input_wid, "inpInput"));
   }
 
   /* cleanup */
   if (input != NULL) {
      window_destroy( input_dialogue.input_wid );
   }
   input_dialogue.input_wid = 0;
 
   /* return the result */
   return input;
}
static void dialogue_inputClose( unsigned int wid, const char *str )
{
   (void) str;
   int *loop_done;
 
   /* break the loop */
   loop_done = window_getData( wid );
   *loop_done = 1;
}
 
static int dialogue_listSelected = -1;
static void dialogue_listCancel( unsigned int wid, const char *str )
{
   dialogue_listSelected = -1;
   dialogue_cancel( wid, str );
}
static void dialogue_listClose( unsigned int wid, const char *str )
{
   dialogue_listSelected = toolkit_getListPos( wid, "lstDialogue" );
   dialogue_close( wid, str );
}
static void select_call_wrapper(unsigned int wid, const char* wgtname)
{
   if (input_dialogue.item_select_cb)
      input_dialogue.item_select_cb(wid, wgtname,input_dialogue.x,
            input_dialogue.y, input_dialogue.w,
            input_dialogue.h);
}
int dialogue_list( const char* title, char **items, int nitems, const char *fmt, ... )
{
   char msg[STRMAX_SHORT];
   va_list ap;
 
   if (input_dialogue.input_wid) return -1;
 
   if (fmt == NULL)
      return -1;
   va_start(ap, fmt);
   vsnprintf(msg, sizeof(msg), fmt, ap);
   va_end(ap);
 
   return dialogue_listPanelRaw( title, items, nitems, 0, 0, NULL, NULL, msg );
}
int dialogue_listRaw( const char* title, char **items, int nitems, const char *msg )
{
   if (input_dialogue.input_wid) return -1;
   return dialogue_listPanelRaw( title, items, nitems, 0, 0, NULL, NULL, msg );
}
int dialogue_listPanel( const char* title, char **items, int nitems, int extrawidth,
      int minheight, void (*add_widgets) (unsigned int wid, int x, int y, int w, int h),
      void (*select_call) (unsigned int wid, const char* wgtname, int x, int y, int w, int h),
      const char *fmt, ... )
{
   char msg[STRMAX_SHORT];
   va_list ap;
 
   if (input_dialogue.input_wid)
      return -1;
 
   if (fmt == NULL)
      return -1;
 
   /* get the message */
   va_start(ap, fmt);
   vsnprintf(msg, sizeof(msg), fmt, ap);
   va_end(ap);
 
   return dialogue_listPanelRaw( title, items, nitems, extrawidth, minheight,
         add_widgets, select_call, msg );
}
int dialogue_listPanelRaw( const char* title, char **items, int nitems, int extrawidth,
      int minheight, void (*add_widgets) (unsigned int wid, int x, int y, int w, int h),
      void (*select_call) (unsigned int wid, const char* wgtname, int x, int y, int w, int h),
      const char *msg )
{
   int i;
   int w, h, winw, winh;
   glFont* font;
   unsigned int wid;
   int list_width, list_height;
   int text_height, text_width;
   int done;
 
   if (input_dialogue.input_wid) return -1;
 
   font = dialogue_getSize( title, msg, &text_width, &text_height );
 
   /* Calculate size stuff. */
   list_width  = 0;
   list_height = 0;
   for (i=0; i<nitems; i++) {
      list_width = MAX( list_width, gl_printWidthRaw( &gl_defFont, items[i] ) );
      list_height += gl_defFont.h + 5;
   }
   list_height += 100;
   if (list_height > 500)
      h = (list_height*8)/10;
   else
      h = MAX( 300, list_height );
 
   h = MIN( ((double)SCREEN_H*2.)/3., h );
   w = MAX( list_width + 60, 500 );
 
   winw = w + extrawidth;
   winh = MAX( h, minheight );
 
   h = winh;
 
   /* Create the window. */
   wid = window_create( "dlgListPanel", title, -1, -1, winw, winh );
   window_setData( wid, &done );
   window_addText( wid, 20, -40, w-40, text_height,  0, "txtMsg",
         font, NULL, msg );
   window_setAccept( wid, dialogue_listClose );
   window_setCancel( wid, dialogue_listCancel );
 
   if (add_widgets)
      add_widgets(wid, w, 0, winw, winh);
 
   if (select_call) {
      input_dialogue.x = w;
      input_dialogue.y = 0;
      input_dialogue.w = winw;
      input_dialogue.h = winh;
      input_dialogue.item_select_cb = select_call;
   }
 
   /* Create the list. */
   window_addList( wid, 20, -40-text_height-20,
         w-40, h - (40+text_height+20) - (20+30+20),
         "lstDialogue", items, nitems, 0, select_call_wrapper,
         dialogue_listClose );
 
   /* Create the buttons. */
   window_addButton( wid, -20, 20, 120, 30,
         "btnOK", _("OK"), dialogue_listClose );
   window_addButton( wid, -20-120-20, 20, 120, 30,
         "btnCancel", _("Cancel"), dialogue_listCancel );
 
   toolkit_loop( &done, NULL );
   /* cleanup */
   input_dialogue.x = 0;
   input_dialogue.y = 0;
   input_dialogue.w = 0;
   input_dialogue.h = 0;
   input_dialogue.item_select_cb = NULL;
 
   return dialogue_listSelected;
}
static unsigned int choice_wid = 0; 
static char *choice_result; 
static int choice_nopts; 
void dialogue_makeChoice( const char *caption, const char *msg, int opts )
{
   int w,h;
   glFont* font;
 
   choice_result  = NULL;
   choice_nopts   = opts;
   font           = dialogue_getSize( caption, msg, &w, &h );
 
   /* create window */
   choice_wid     = window_create( "dlgChoice", caption, -1, -1, w, h+100+40*choice_nopts );
   /* text */
   window_addText( choice_wid, 20, -40, w-40, h,  0, "txtChoice",
         font, NULL, msg );
}
void dialogue_addChoice( const char *caption, const char *msg, const char *opt)
{
   int w,h;
 
   if (choice_nopts < 1)
      return;
 
   dialogue_getSize( caption, msg, &w, &h );
 
   /* buttons. Add one for each option in the menu. */
   window_addButton( choice_wid, w/2-125, choice_nopts*40, 250, 30, (char *) opt,
         (char *) opt, dialogue_choiceClose );
   choice_nopts --;
 
}
char *dialogue_runChoice (void)
{
   int done;
   char *res;
 
   /* tricky secondary loop */
   window_setData( choice_wid, &done );
   toolkit_loop( &done, NULL );
 
   /* Save value. */
   res = choice_result;
   choice_result = NULL;
 
   return res;
}
static void dialogue_choiceClose( unsigned int wid, const char *str )
{
   int *loop_done;
 
   /* Save result. */
   choice_result = strdup(str);
 
   /* Finish loop. */
   loop_done = window_getData( wid );
   *loop_done = 1;
 
   /* destroy the window */
   choice_wid = 0;
   window_destroy( wid );
}
 
static int dialogue_custom_event( unsigned int wid, SDL_Event *event )
{
   int mx, my;
   struct dialogue_custom_data_s *cd;
   void *data = window_getData( wid );
   cd = (struct dialogue_custom_data_s*) data;
 
   /* We translate mouse coords here. */
   if ((event->type==SDL_MOUSEBUTTONDOWN) ||
         (event->type==SDL_MOUSEBUTTONUP) ||
         (event->type==SDL_MOUSEMOTION)) {
      gl_windowToScreenPos( &mx, &my, event->button.x, event->button.y );
      mx += cd->mx;
      my += cd->my;
      /* Ignore out of bounds. We have to implement checking here. */
      if ((mx < 0) || (mx >= cd->w) || (my < 0) || (my >= cd->h))
         return 0;
      event->button.x = mx;
      event->button.y = my;
   }
 
   return (*cd->event)( wid, event, cd->data );
}
void dialogue_custom( const char* caption, int width, int height,
      int (*update) (double dt, void* data),
      void (*render) (double x, double y, double w, double h, void* data),
      int (*event) (unsigned int wid, SDL_Event* event, void* data),
      void* data, int autofree, int dynamic )
{
   struct dialogue_custom_data_s cd;
   dialogue_update_t du;
   unsigned int wid;
   int done, fullscreen;
   int wx, wy, wgtx, wgty;
 
   fullscreen = ((width < 0) && (height < 0));
 
   /* create the window */
   if (fullscreen) {
      wid = window_create( "dlgMsg", caption, -1, -1, -1, -1 );
      window_setBorder( wid, 0 );
   }
   else
      wid = window_create( "dlgMsg", caption, -1, -1, width+40, height+60 );
   window_setData( wid, &done );
 
   /* custom widget for all! */
   if (fullscreen) {
      width  = gl_screen.nw;
      height = gl_screen.nh;
      wgtx = wgty = 0;
   }
   else {
      wgtx = wgty = 20;
   }
   window_addCust( wid, wgtx, wgty, width, height, "cstCustom", 0, render, NULL, NULL, NULL, data );
   if (dynamic)
      window_custSetDynamic( wid, "cstCustom", 1 );
   if (autofree)
      window_custAutoFreeData( wid, "cstCustom" );
   window_custSetClipping( wid, "cstCustom", 1 );
 
   /* set up event stuff. */
   window_posWindow( wid, &wx, &wy );
   window_posWidget( wid, "cstCustom", &wgtx, &wgty );
   cd.event = event;
   cd.data = data;
   cd.mx = -wx-wgtx;
   cd.my = -wy-wgty;
   cd.w = width;
   cd.h = height;
   window_setData( wid, &cd );
   if (event != NULL)
      window_handleEvents( wid, &dialogue_custom_event );
 
   /* dialogue stuff */
   du.update = update;
   du.data   = data;
   du.wid    = wid;
   toolkit_loop( &done, &du );
}
 
int dialogue_customFullscreen( int enable )
{
   struct dialogue_custom_data_s *cd;
   unsigned int wid = window_get( "dlgMsg" );
   int w, h;
   if (wid == 0)
      return -1;
 
   cd = (struct dialogue_custom_data_s*) window_getData( wid );
   window_dimWindow( wid, &w, &h );
 
   if (enable) {
      cd->last_w = cd->w+40;
      cd->last_h = cd->h+60;
      window_resize( wid, -1, -1 );
      window_moveWidget( wid, "cstCustom", 0, 0 );
      window_resizeWidget( wid, "cstCustom", cd->last_w, cd->last_h );
      window_move( wid, -1, -1 );
      window_setBorder( wid, 0 );
   }
   else {
      window_resize( wid, cd->last_w, cd->last_h );
      window_moveWidget( wid, "cstCustom", 20, 20 );
      window_move( wid, -1, -1 );
      window_setBorder( wid, 1 );
   }
 
   return 0;
}
 
int dialogue_customResize( int width, int height )
{
   struct dialogue_custom_data_s *cd;
   unsigned int wid = window_get( "dlgMsg" );
   if (wid == 0)
      return -1;
   cd = (struct dialogue_custom_data_s*) window_getData( wid );
   cd->last_w = width;
   cd->last_h = height;
   window_resize( wid, width+40, height+60 );
   window_resizeWidget( wid, "cstCustom", width, height );
   return 0;
}
 
static int toolkit_loop( int *loop_done, dialogue_update_t *du )
{
   Uint64 time_ms = SDL_GetTicks64();
   const double fps_max = (conf.fps_max > 0) ? 1./(double)conf.fps_max : fps_min;
   int quit_game = 0;
 
   /* Delay a toolkit iteration. */
   toolkit_delay();
 
   /* Increment dialogues. */
   dialogue_open++;
   *loop_done = 0;
 
   /* Flush events so SDL_LOOPDONE doesn't propagate. */
   SDL_FlushEvent( SDL_LOOPDONE );
 
   while (!(*loop_done) && toolkit_isOpen() && !naev_isQuit()) {
      SDL_Event event;
      Uint64 t;
      double dt;
 
      /* Loop first so exit condition is checked before next iteration. */
      main_loop( 1 );
 
      while (!naev_isQuit() && SDL_PollEvent(&event)) { /* event loop */
         if (event.type == SDL_QUIT) {
            if (menu_askQuit()) {
               naev_quit(); /* Quit is handled here */
               *loop_done = 1; /* Exit loop and exit game. */
               quit_game = 1;
               break;
            }
         }
         else if (event.type == SDL_LOOPDONE) {
            *loop_done = 1;
            SDL_PushEvent( &event ); /* Replicate event until out of all loops. */
            break;
         }
         else if (event.type == SDL_WINDOWEVENT &&
               event.window.event == SDL_WINDOWEVENT_RESIZED)
            naev_resize();
 
         input_handle(&event); /* handles all the events and player keybinds */
      }
 
      /* FPS Control. */
      /* Get elapsed. */
      t  = SDL_GetTicks64();
      dt = (double)(t - time_ms) / 1000.;
      time_ms = t;
      /* Sleep if necessary. */
      if (dt < fps_max) {
         double delay = fps_max - dt;
         SDL_Delay( (unsigned int)(delay * 1000.) );
      }
 
      /* Update stuff. */
      if (du != NULL) {
         /* Run update. */
         if ((*du->update)(dt, du->data)) {
            /* Hack to override data. */
            window_setData( du->wid, loop_done );
            dialogue_close( du->wid, NULL );
         }
      }
   }
 
   /* Close dialogue. */
   dialogue_open--;
   if (dialogue_open < 0)
      WARN(_("Dialogue counter not in sync!"));
 
   return quit_game;
}