src/video/SDL_video.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 08 Dec 2008 00:27:32 +0000
changeset 2859 99210400e8b9
parent 2849 523b10db69f8
child 2860 6ce28e5287e9
permissions -rw-r--r--
Updated copyright date
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2009 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 #include "SDL_config.h"
    23 
    24 /* The high-level video driver subsystem */
    25 
    26 #include "SDL.h"
    27 #include "SDL_sysvideo.h"
    28 #include "SDL_blit.h"
    29 #include "SDL_pixels_c.h"
    30 #include "SDL_renderer_gl.h"
    31 #include "SDL_renderer_gles.h"
    32 #include "SDL_renderer_sw.h"
    33 #include "../events/SDL_sysevents.h"
    34 #include "../events/SDL_events_c.h"
    35 
    36 #if SDL_VIDEO_OPENGL_ES
    37 #include "SDL_opengles.h"
    38 #endif /* SDL_VIDEO_OPENGL_ES */
    39 
    40 #if SDL_VIDEO_OPENGL
    41 #include "SDL_opengl.h"
    42 
    43 /* On Windows, windows.h defines CreateWindow */
    44 #ifdef CreateWindow
    45 #undef CreateWindow
    46 #endif
    47 #endif /* SDL_VIDEO_OPENGL */
    48 
    49 /* Available video drivers */
    50 static VideoBootStrap *bootstrap[] = {
    51 #if SDL_VIDEO_DRIVER_COCOA
    52     &COCOA_bootstrap,
    53 #endif
    54 #if SDL_VIDEO_DRIVER_X11
    55     &X11_bootstrap,
    56 #endif
    57 #if SDL_VIDEO_DRIVER_NANOX
    58     &NX_bootstrap,
    59 #endif
    60 #if SDL_VIDEO_DRIVER_IPOD
    61     &iPod_bootstrap,
    62 #endif
    63 #if SDL_VIDEO_DRIVER_WSCONS
    64     &WSCONS_bootstrap,
    65 #endif
    66 #if SDL_VIDEO_DRIVER_FBCON
    67     &FBCON_bootstrap,
    68 #endif
    69 #if SDL_VIDEO_DRIVER_DIRECTFB
    70     &DirectFB_bootstrap,
    71 #endif
    72 #if SDL_VIDEO_DRIVER_PS2GS
    73     &PS2GS_bootstrap,
    74 #endif
    75 #if SDL_VIDEO_DRIVER_VGL
    76     &VGL_bootstrap,
    77 #endif
    78 #if SDL_VIDEO_DRIVER_SVGALIB
    79     &SVGALIB_bootstrap,
    80 #endif
    81 #if SDL_VIDEO_DRIVER_GAPI
    82     &GAPI_bootstrap,
    83 #endif
    84 #if SDL_VIDEO_DRIVER_WIN32
    85     &WIN32_bootstrap,
    86 #endif
    87 #if SDL_VIDEO_DRIVER_BWINDOW
    88     &BWINDOW_bootstrap,
    89 #endif
    90 #if SDL_VIDEO_DRIVER_PHOTON
    91     &ph_bootstrap,
    92 #endif
    93 #if SDL_VIDEO_DRIVER_EPOC
    94     &EPOC_bootstrap,
    95 #endif
    96 #if SDL_VIDEO_DRIVER_XBIOS
    97     &XBIOS_bootstrap,
    98 #endif
    99 #if SDL_VIDEO_DRIVER_GEM
   100     &GEM_bootstrap,
   101 #endif
   102 #if SDL_VIDEO_DRIVER_DC
   103     &DC_bootstrap,
   104 #endif
   105 #if SDL_VIDEO_DRIVER_RISCOS
   106     &RISCOS_bootstrap,
   107 #endif
   108 #if SDL_VIDEO_DRIVER_OS2FS
   109     &OS2FSLib_bootstrap,
   110 #endif
   111 #if SDL_VIDEO_DRIVER_NDS
   112     &NDS_bootstrap,
   113 #endif
   114 #if SDL_VIDEO_DRIVER_UIKIT
   115     &UIKIT_bootstrap,
   116 #endif
   117 #if SDL_VIDEO_DRIVER_DUMMY
   118     &DUMMY_bootstrap,
   119 #endif
   120     NULL
   121 };
   122 
   123 static SDL_VideoDevice *_this = NULL;
   124 
   125 /* Various local functions */
   126 int SDL_VideoInit(const char *driver_name, Uint32 flags);
   127 void SDL_VideoQuit(void);
   128 
   129 static int
   130 cmpmodes(const void *A, const void *B)
   131 {
   132     SDL_DisplayMode a = *(const SDL_DisplayMode *) A;
   133     SDL_DisplayMode b = *(const SDL_DisplayMode *) B;
   134 
   135     if (a.w != b.w) {
   136         return b.w - a.w;
   137     }
   138     if (a.h != b.h) {
   139         return b.h - a.h;
   140     }
   141     if (SDL_BITSPERPIXEL(a.format) != SDL_BITSPERPIXEL(b.format)) {
   142         return SDL_BITSPERPIXEL(b.format) - SDL_BITSPERPIXEL(a.format);
   143     }
   144     if (a.refresh_rate != b.refresh_rate) {
   145         return b.refresh_rate - a.refresh_rate;
   146     }
   147     return 0;
   148 }
   149 
   150 static void
   151 SDL_UninitializedVideo()
   152 {
   153     SDL_SetError("Video subsystem has not been initialized");
   154 }
   155 
   156 int
   157 SDL_GetNumVideoDrivers(void)
   158 {
   159     return SDL_arraysize(bootstrap) - 1;
   160 }
   161 
   162 const char *
   163 SDL_GetVideoDriver(int index)
   164 {
   165     if (index >= 0 && index < SDL_GetNumVideoDrivers()) {
   166         return bootstrap[index]->name;
   167     }
   168     return NULL;
   169 }
   170 
   171 /*
   172  * Initialize the video and event subsystems -- determine native pixel format
   173  */
   174 int
   175 SDL_VideoInit(const char *driver_name, Uint32 flags)
   176 {
   177     SDL_VideoDevice *video;
   178     int index;
   179     int i;
   180 
   181     /* Toggle the event thread flags, based on OS requirements */
   182 #if defined(MUST_THREAD_EVENTS)
   183     flags |= SDL_INIT_EVENTTHREAD;
   184 #elif defined(CANT_THREAD_EVENTS)
   185     if ((flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD) {
   186         SDL_SetError("OS doesn't support threaded events");
   187         return -1;
   188     }
   189 #endif
   190 
   191     /* Start the event loop */
   192     if (SDL_StartEventLoop(flags) < 0) {
   193         return -1;
   194     }
   195     /* Check to make sure we don't overwrite '_this' */
   196     if (_this != NULL) {
   197         SDL_VideoQuit();
   198     }
   199     /* Select the proper video driver */
   200     index = 0;
   201     video = NULL;
   202     if (driver_name == NULL) {
   203         driver_name = SDL_getenv("SDL_VIDEODRIVER");
   204     }
   205     if (driver_name != NULL) {
   206         for (i = 0; bootstrap[i]; ++i) {
   207             if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) {
   208                 if (bootstrap[i]->available()) {
   209                     video = bootstrap[i]->create(index);
   210                 }
   211                 break;
   212             }
   213         }
   214     } else {
   215         for (i = 0; bootstrap[i]; ++i) {
   216             if (bootstrap[i]->available()) {
   217                 video = bootstrap[i]->create(index);
   218                 if (video != NULL) {
   219                     break;
   220                 }
   221             }
   222         }
   223     }
   224     if (video == NULL) {
   225         if (driver_name) {
   226             SDL_SetError("%s not available", driver_name);
   227         } else {
   228             SDL_SetError("No available video device");
   229         }
   230         return -1;
   231     }
   232     _this = video;
   233     _this->name = bootstrap[i]->name;
   234     _this->next_object_id = 1;
   235 
   236 
   237     /* Set some very sane GL defaults */
   238     _this->gl_config.driver_loaded = 0;
   239     _this->gl_config.dll_handle = NULL;
   240     _this->gl_config.red_size = 3;
   241     _this->gl_config.green_size = 3;
   242     _this->gl_config.blue_size = 2;
   243     _this->gl_config.alpha_size = 0;
   244     _this->gl_config.buffer_size = 0;
   245     _this->gl_config.depth_size = 16;
   246     _this->gl_config.stencil_size = 0;
   247     _this->gl_config.double_buffer = 1;
   248     _this->gl_config.accum_red_size = 0;
   249     _this->gl_config.accum_green_size = 0;
   250     _this->gl_config.accum_blue_size = 0;
   251     _this->gl_config.accum_alpha_size = 0;
   252     _this->gl_config.stereo = 0;
   253     _this->gl_config.multisamplebuffers = 0;
   254     _this->gl_config.multisamplesamples = 0;
   255     _this->gl_config.retained_backing = 1;
   256     _this->gl_config.accelerated = -1;  /* not known, don't set */
   257 
   258     /* Initialize the video subsystem */
   259     if (_this->VideoInit(_this) < 0) {
   260         SDL_VideoQuit();
   261         return -1;
   262     }
   263     /* Make sure some displays were added */
   264     if (_this->num_displays == 0) {
   265         SDL_SetError("The video driver did not add any displays");
   266         SDL_VideoQuit();
   267         return (-1);
   268     }
   269     /* The software renderer is always available */
   270     for (i = 0; i < _this->num_displays; ++i) {
   271 #if SDL_VIDEO_RENDER_OGL
   272         SDL_AddRenderDriver(i, &GL_RenderDriver);
   273 #endif
   274 
   275 #if SDL_VIDEO_RENDER_OGL_ES
   276         SDL_AddRenderDriver(i, &GL_ES_RenderDriver);
   277 #endif
   278         if (_this->displays[i].num_render_drivers > 0) {
   279             SDL_AddRenderDriver(i, &SW_RenderDriver);
   280         }
   281     }
   282 
   283     /* We're ready to go! */
   284     return 0;
   285 }
   286 
   287 const char *
   288 SDL_GetCurrentVideoDriver()
   289 {
   290     if (!_this) {
   291         SDL_UninitializedVideo();
   292         return NULL;
   293     }
   294     return _this->name;
   295 }
   296 
   297 SDL_VideoDevice *
   298 SDL_GetVideoDevice()
   299 {
   300     return _this;
   301 }
   302 
   303 int
   304 SDL_AddBasicVideoDisplay(const SDL_DisplayMode * desktop_mode)
   305 {
   306     SDL_VideoDisplay display;
   307 
   308     SDL_zero(display);
   309     if (desktop_mode) {
   310         display.desktop_mode = *desktop_mode;
   311     }
   312     display.current_mode = display.desktop_mode;
   313 
   314     return SDL_AddVideoDisplay(&display);
   315 }
   316 
   317 int
   318 SDL_AddVideoDisplay(const SDL_VideoDisplay * display)
   319 {
   320     SDL_VideoDisplay *displays;
   321     int index = -1;
   322 
   323     displays =
   324         SDL_realloc(_this->displays,
   325                     (_this->num_displays + 1) * sizeof(*displays));
   326     if (displays) {
   327         index = _this->num_displays++;
   328         displays[index] = *display;
   329         displays[index].device = _this;
   330         _this->displays = displays;
   331     } else {
   332         SDL_OutOfMemory();
   333     }
   334     return index;
   335 }
   336 
   337 int
   338 SDL_GetNumVideoDisplays(void)
   339 {
   340     if (!_this) {
   341         SDL_UninitializedVideo();
   342         return 0;
   343     }
   344     return _this->num_displays;
   345 }
   346 
   347 int
   348 SDL_SelectVideoDisplay(int index)
   349 {
   350     if (!_this) {
   351         SDL_UninitializedVideo();
   352         return (-1);
   353     }
   354     if (index < 0 || index >= _this->num_displays) {
   355         SDL_SetError("index must be in the range 0 - %d",
   356                      _this->num_displays - 1);
   357         return -1;
   358     }
   359     _this->current_display = index;
   360     return 0;
   361 }
   362 
   363 int
   364 SDL_GetCurrentVideoDisplay(void)
   365 {
   366     if (!_this) {
   367         SDL_UninitializedVideo();
   368         return (-1);
   369     }
   370     return _this->current_display;
   371 }
   372 
   373 SDL_bool
   374 SDL_AddDisplayMode(int displayIndex, const SDL_DisplayMode * mode)
   375 {
   376     SDL_VideoDisplay *display = &_this->displays[displayIndex];
   377     SDL_DisplayMode *modes;
   378     int i, nmodes;
   379 
   380     /* Make sure we don't already have the mode in the list */
   381     modes = display->display_modes;
   382     nmodes = display->num_display_modes;
   383     for (i = nmodes; i--;) {
   384         if (SDL_memcmp(mode, &modes[i], sizeof(*mode)) == 0) {
   385             return SDL_FALSE;
   386         }
   387     }
   388 
   389     /* Go ahead and add the new mode */
   390     if (nmodes == display->max_display_modes) {
   391         modes =
   392             SDL_realloc(modes,
   393                         (display->max_display_modes + 32) * sizeof(*modes));
   394         if (!modes) {
   395             return SDL_FALSE;
   396         }
   397         display->display_modes = modes;
   398         display->max_display_modes += 32;
   399     }
   400     modes[nmodes] = *mode;
   401     display->num_display_modes++;
   402 
   403     return SDL_TRUE;
   404 }
   405 
   406 int
   407 SDL_GetNumDisplayModes()
   408 {
   409     if (_this) {
   410         SDL_VideoDisplay *display = &SDL_CurrentDisplay;
   411         if (!display->num_display_modes && _this->GetDisplayModes) {
   412             _this->GetDisplayModes(_this);
   413             SDL_qsort(display->display_modes, display->num_display_modes,
   414                       sizeof(SDL_DisplayMode), cmpmodes);
   415         }
   416         return display->num_display_modes;
   417     }
   418     return 0;
   419 }
   420 
   421 int
   422 SDL_GetDisplayMode(int index, SDL_DisplayMode * mode)
   423 {
   424     if (index < 0 || index >= SDL_GetNumDisplayModes()) {
   425         SDL_SetError("index must be in the range of 0 - %d",
   426                      SDL_GetNumDisplayModes() - 1);
   427         return -1;
   428     }
   429     if (mode) {
   430         *mode = SDL_CurrentDisplay.display_modes[index];
   431     }
   432     return 0;
   433 }
   434 
   435 int
   436 SDL_GetDesktopDisplayMode(SDL_DisplayMode * mode)
   437 {
   438     if (!_this) {
   439         SDL_UninitializedVideo();
   440         return -1;
   441     }
   442     if (mode) {
   443         *mode = SDL_CurrentDisplay.desktop_mode;
   444     }
   445     return 0;
   446 }
   447 
   448 int
   449 SDL_GetCurrentDisplayMode(SDL_DisplayMode * mode)
   450 {
   451     if (!_this) {
   452         SDL_UninitializedVideo();
   453         return -1;
   454     }
   455     if (mode) {
   456         *mode = SDL_CurrentDisplay.current_mode;
   457     }
   458     return 0;
   459 }
   460 
   461 SDL_DisplayMode *
   462 SDL_GetClosestDisplayMode(const SDL_DisplayMode * mode,
   463                           SDL_DisplayMode * closest)
   464 {
   465     Uint32 target_format;
   466     int target_refresh_rate;
   467     int i;
   468     SDL_DisplayMode *current, *match;
   469 
   470     if (!_this || !mode || !closest) {
   471         return NULL;
   472     }
   473     /* Default to the desktop format */
   474     if (mode->format) {
   475         target_format = mode->format;
   476     } else {
   477         target_format = SDL_CurrentDisplay.desktop_mode.format;
   478     }
   479 
   480     /* Default to the desktop refresh rate */
   481     if (mode->refresh_rate) {
   482         target_refresh_rate = mode->refresh_rate;
   483     } else {
   484         target_refresh_rate = SDL_CurrentDisplay.desktop_mode.refresh_rate;
   485     }
   486 
   487     match = NULL;
   488     for (i = 0; i < SDL_GetNumDisplayModes(); ++i) {
   489         current = &SDL_CurrentDisplay.display_modes[i];
   490 
   491         if (current->w && (current->w < mode->w)) {
   492             /* Out of sorted modes large enough here */
   493             break;
   494         }
   495         if (current->h && (current->h < mode->h)) {
   496             if (current->w && (current->w == mode->w)) {
   497                 /* Out of sorted modes large enough here */
   498                 break;
   499             }
   500             /* Wider, but not tall enough, due to a different
   501                aspect ratio. This mode must be skipped, but closer
   502                modes may still follow. */
   503             continue;
   504         }
   505         if (!match || current->w < match->w || current->h < match->h) {
   506             match = current;
   507             continue;
   508         }
   509         if (current->format != match->format) {
   510             /* Sorted highest depth to lowest */
   511             if (current->format == target_format ||
   512                 (SDL_BITSPERPIXEL(current->format) >=
   513                  SDL_BITSPERPIXEL(target_format)
   514                  && SDL_PIXELTYPE(current->format) ==
   515                  SDL_PIXELTYPE(target_format))) {
   516                 match = current;
   517             }
   518             continue;
   519         }
   520         if (current->refresh_rate != match->refresh_rate) {
   521             /* Sorted highest refresh to lowest */
   522             if (current->refresh_rate >= target_refresh_rate) {
   523                 match = current;
   524             }
   525         }
   526     }
   527     if (match) {
   528         if (match->format) {
   529             closest->format = match->format;
   530         } else {
   531             closest->format = mode->format;
   532         }
   533         if (match->w && match->h) {
   534             closest->w = match->w;
   535             closest->h = match->h;
   536         } else {
   537             closest->w = mode->w;
   538             closest->h = mode->h;
   539         }
   540         if (match->refresh_rate) {
   541             closest->refresh_rate = match->refresh_rate;
   542         } else {
   543             closest->refresh_rate = mode->refresh_rate;
   544         }
   545         closest->driverdata = match->driverdata;
   546 
   547         /*
   548          * Pick some reasonable defaults if the app and driver don't
   549          * care
   550          */
   551         if (!closest->format) {
   552             closest->format = SDL_PIXELFORMAT_RGB888;
   553         }
   554         if (!closest->w) {
   555             closest->w = 640;
   556         }
   557         if (!closest->h) {
   558             closest->h = 480;
   559         }
   560         return closest;
   561     }
   562     return NULL;
   563 }
   564 
   565 int
   566 SDL_SetDisplayMode(const SDL_DisplayMode * mode)
   567 {
   568     SDL_VideoDisplay *display;
   569     SDL_DisplayMode display_mode;
   570     SDL_DisplayMode current_mode;
   571     int i, ncolors;
   572 
   573     if (!_this) {
   574         SDL_UninitializedVideo();
   575         return -1;
   576     }
   577     display = &SDL_CurrentDisplay;
   578     if (!mode) {
   579         mode = &display->desktop_mode;
   580     }
   581     display_mode = *mode;
   582 
   583     /* Default to the current mode */
   584     if (!display_mode.format) {
   585         display_mode.format = display->current_mode.format;
   586     }
   587     if (!display_mode.w) {
   588         display_mode.w = display->current_mode.w;
   589     }
   590     if (!display_mode.h) {
   591         display_mode.h = display->current_mode.h;
   592     }
   593     if (!display_mode.refresh_rate) {
   594         display_mode.refresh_rate = display->current_mode.refresh_rate;
   595     }
   596     /* Get a good video mode, the closest one possible */
   597     if (!SDL_GetClosestDisplayMode(&display_mode, &display_mode)) {
   598         SDL_SetError("No video mode large enough for %dx%d",
   599                      display_mode.w, display_mode.h);
   600         return -1;
   601     }
   602     /* See if there's anything left to do */
   603     SDL_GetCurrentDisplayMode(&current_mode);
   604     if (SDL_memcmp(&display_mode, &current_mode, sizeof(display_mode)) == 0) {
   605         return 0;
   606     }
   607     /* Actually change the display mode */
   608     if (_this->SetDisplayMode(_this, &display_mode) < 0) {
   609         return -1;
   610     }
   611     display->current_mode = display_mode;
   612 
   613     /* Set up a palette, if necessary */
   614     if (SDL_ISPIXELFORMAT_INDEXED(display_mode.format)) {
   615         ncolors = (1 << SDL_BITSPERPIXEL(display_mode.format));
   616     } else {
   617         ncolors = 0;
   618     }
   619     if ((!ncolors && display->palette) || (ncolors && !display->palette)
   620         || (ncolors && ncolors != display->palette->ncolors)) {
   621         if (display->palette) {
   622             SDL_FreePalette(display->palette);
   623             display->palette = NULL;
   624         }
   625         if (ncolors) {
   626             display->palette = SDL_AllocPalette(ncolors);
   627             if (!display->palette) {
   628                 return -1;
   629             }
   630             SDL_DitherColors(display->palette->colors,
   631                              SDL_BITSPERPIXEL(display_mode.format));
   632         }
   633     }
   634     /* Move any fullscreen windows into position */
   635     for (i = 0; i < display->num_windows; ++i) {
   636         SDL_Window *window = &display->windows[i];
   637         if (FULLSCREEN_VISIBLE(window)) {
   638             SDL_SetWindowPosition(window->id, SDL_WINDOWPOS_CENTERED,
   639                                   SDL_WINDOWPOS_CENTERED);
   640         }
   641     }
   642 
   643     return 0;
   644 }
   645 
   646 int
   647 SDL_SetFullscreenDisplayMode(const SDL_DisplayMode * mode)
   648 {
   649     SDL_VideoDisplay *display;
   650     SDL_DisplayMode fullscreen_mode;
   651     int i;
   652 
   653     if (!_this) {
   654         SDL_UninitializedVideo();
   655         return -1;
   656     }
   657     display = &SDL_CurrentDisplay;
   658     if (!mode) {
   659         mode = &display->desktop_mode;
   660     }
   661     SDL_GetClosestDisplayMode(mode, &fullscreen_mode);
   662     if (SDL_memcmp
   663         (&fullscreen_mode, &display->fullscreen_mode,
   664          sizeof(fullscreen_mode)) == 0) {
   665         /* Nothing to do... */
   666         return 0;
   667     }
   668     display->fullscreen_mode = fullscreen_mode;
   669 
   670     /* Actually set the mode if we have a fullscreen window visible */
   671     for (i = 0; i < display->num_windows; ++i) {
   672         SDL_Window *window = &display->windows[i];
   673         if (FULLSCREEN_VISIBLE(window)) {
   674             if (SDL_SetDisplayMode(&display->fullscreen_mode) < 0) {
   675                 return -1;
   676             }
   677         }
   678         if (window->flags & SDL_WINDOW_FULLSCREEN) {
   679             SDL_OnWindowResized(window);
   680         }
   681     }
   682     return 0;
   683 }
   684 
   685 int
   686 SDL_GetFullscreenDisplayMode(SDL_DisplayMode * mode)
   687 {
   688     if (!_this) {
   689         SDL_UninitializedVideo();
   690         return -1;
   691     }
   692     if (mode) {
   693         *mode = SDL_CurrentDisplay.fullscreen_mode;
   694     }
   695     return 0;
   696 }
   697 
   698 int
   699 SDL_SetDisplayPalette(const SDL_Color * colors, int firstcolor, int ncolors)
   700 {
   701     SDL_Palette *palette;
   702     int status = 0;
   703 
   704     if (!_this) {
   705         SDL_UninitializedVideo();
   706         return -1;
   707     }
   708     palette = SDL_CurrentDisplay.palette;
   709     if (!palette) {
   710         SDL_SetError("Display mode does not have a palette");
   711         return -1;
   712     }
   713     status = SDL_SetPaletteColors(palette, colors, firstcolor, ncolors);
   714 
   715     if (_this->SetDisplayPalette) {
   716         if (_this->SetDisplayPalette(_this, palette) < 0) {
   717             status = -1;
   718         }
   719     }
   720     return status;
   721 }
   722 
   723 int
   724 SDL_GetDisplayPalette(SDL_Color * colors, int firstcolor, int ncolors)
   725 {
   726     SDL_Palette *palette;
   727 
   728     if (!_this) {
   729         SDL_UninitializedVideo();
   730         return -1;
   731     }
   732     palette = SDL_CurrentDisplay.palette;
   733     if (!palette->ncolors) {
   734         SDL_SetError("Display mode does not have a palette");
   735         return -1;
   736     }
   737     if (firstcolor < 0 || (firstcolor + ncolors) > palette->ncolors) {
   738         SDL_SetError("Palette indices are out of range");
   739         return -1;
   740     }
   741     SDL_memcpy(colors, &palette->colors[firstcolor],
   742                ncolors * sizeof(*colors));
   743     return 0;
   744 }
   745 
   746 SDL_WindowID
   747 SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
   748 {
   749     const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
   750                                   SDL_WINDOW_OPENGL |
   751                                   SDL_WINDOW_BORDERLESS |
   752                                   SDL_WINDOW_RESIZABLE);
   753     SDL_VideoDisplay *display;
   754     SDL_Window window;
   755     int num_windows;
   756     SDL_Window *windows;
   757 
   758     if (!_this) {
   759         SDL_UninitializedVideo();
   760         return 0;
   761     }
   762     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   763         SDL_SetError("No OpenGL support in video driver");
   764         return 0;
   765     }
   766     /* Fullscreen windows don't have any window decorations */
   767     if (flags & SDL_WINDOW_FULLSCREEN) {
   768         flags |= SDL_WINDOW_BORDERLESS;
   769         flags &= ~SDL_WINDOW_RESIZABLE;
   770     }
   771     SDL_zero(window);
   772     window.id = _this->next_object_id++;
   773     window.x = x;
   774     window.y = y;
   775     window.w = w;
   776     window.h = h;
   777     window.flags = (flags & allowed_flags);
   778     window.display = _this->current_display;
   779 
   780     if (_this->CreateWindow && _this->CreateWindow(_this, &window) < 0) {
   781         return 0;
   782     }
   783     display = &SDL_CurrentDisplay;
   784     num_windows = display->num_windows;
   785     windows =
   786         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   787     if (!windows) {
   788         if (_this->DestroyWindow) {
   789             _this->DestroyWindow(_this, &window);
   790         }
   791         return 0;
   792     }
   793     windows[num_windows] = window;
   794     display->windows = windows;
   795     display->num_windows++;
   796 
   797     if (title) {
   798         SDL_SetWindowTitle(window.id, title);
   799     }
   800     if (flags & SDL_WINDOW_MAXIMIZED) {
   801         SDL_MaximizeWindow(window.id);
   802     }
   803     if (flags & SDL_WINDOW_MINIMIZED) {
   804         SDL_MinimizeWindow(window.id);
   805     }
   806     if (flags & SDL_WINDOW_SHOWN) {
   807         SDL_ShowWindow(window.id);
   808     }
   809     if (flags & SDL_WINDOW_INPUT_GRABBED) {
   810         SDL_SetWindowGrab(window.id, 1);
   811     }
   812     return window.id;
   813 }
   814 
   815 SDL_WindowID
   816 SDL_CreateWindowFrom(const void *data)
   817 {
   818     SDL_VideoDisplay *display;
   819     SDL_Window window;
   820     int num_windows;
   821     SDL_Window *windows;
   822 
   823     if (!_this) {
   824         SDL_UninitializedVideo();
   825         return (0);
   826     }
   827     SDL_zero(window);
   828     window.id = _this->next_object_id++;
   829     window.display = _this->current_display;
   830 
   831     if (!_this->CreateWindowFrom ||
   832         _this->CreateWindowFrom(_this, &window, data) < 0) {
   833         return 0;
   834     }
   835     display = &SDL_CurrentDisplay;
   836     num_windows = display->num_windows;
   837     windows =
   838         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   839     if (!windows) {
   840         if (_this->DestroyWindow) {
   841             _this->DestroyWindow(_this, &window);
   842         }
   843         if (window.title) {
   844             SDL_free(window.title);
   845         }
   846         return 0;
   847     }
   848     windows[num_windows] = window;
   849     display->windows = windows;
   850     display->num_windows++;
   851 
   852     return window.id;
   853 }
   854 
   855 int
   856 SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
   857 {
   858     char *title = window->title;
   859 
   860     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   861         SDL_SetError("No OpenGL support in video driver");
   862         return -1;
   863     }
   864     if (_this->DestroyWindow) {
   865         _this->DestroyWindow(_this, window);
   866     }
   867     window->title = NULL;
   868     window->flags =
   869         (flags &
   870          ~(SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED | SDL_WINDOW_SHOWN |
   871            SDL_WINDOW_INPUT_GRABBED));
   872 
   873     if (_this->CreateWindow && _this->CreateWindow(_this, window) < 0) {
   874         return -1;
   875     }
   876     if (title) {
   877         SDL_SetWindowTitle(window->id, title);
   878         SDL_free(title);
   879     }
   880     if (flags & SDL_WINDOW_MAXIMIZED) {
   881         SDL_MaximizeWindow(window->id);
   882     }
   883     if (flags & SDL_WINDOW_MINIMIZED) {
   884         SDL_MinimizeWindow(window->id);
   885     }
   886     if (flags & SDL_WINDOW_SHOWN) {
   887         SDL_ShowWindow(window->id);
   888     }
   889     if (flags & SDL_WINDOW_INPUT_GRABBED) {
   890         SDL_SetWindowGrab(window->id, 1);
   891     }
   892     return 0;
   893 }
   894 
   895 SDL_Window *
   896 SDL_GetWindowFromID(SDL_WindowID windowID)
   897 {
   898     int i, j;
   899 
   900     if (!_this) {
   901         SDL_UninitializedVideo();
   902         return NULL;
   903     }
   904     for (i = 0; i < _this->num_displays; ++i) {
   905         SDL_VideoDisplay *display = &_this->displays[i];
   906         for (j = 0; j < display->num_windows; ++j) {
   907             SDL_Window *window = &display->windows[j];
   908             if (window->id == windowID) {
   909                 return window;
   910             }
   911         }
   912     }
   913     return NULL;
   914 }
   915 
   916 SDL_VideoDisplay *
   917 SDL_GetDisplayFromWindow(SDL_Window * window)
   918 {
   919     if (!_this) {
   920         SDL_UninitializedVideo();
   921         return NULL;
   922     }
   923     if (!window) {
   924         return NULL;
   925     }
   926     return &_this->displays[window->display];
   927 }
   928 
   929 Uint32
   930 SDL_GetWindowFlags(SDL_WindowID windowID)
   931 {
   932     SDL_Window *window = SDL_GetWindowFromID(windowID);
   933 
   934     if (!window) {
   935         return 0;
   936     }
   937     return window->flags;
   938 }
   939 
   940 void
   941 SDL_SetWindowTitle(SDL_WindowID windowID, const char *title)
   942 {
   943     SDL_Window *window = SDL_GetWindowFromID(windowID);
   944 
   945     if (!window || title == window->title) {
   946         return;
   947     }
   948     if (window->title) {
   949         SDL_free(window->title);
   950     }
   951     if (title) {
   952         window->title = SDL_strdup(title);
   953     } else {
   954         window->title = NULL;
   955     }
   956 
   957     if (_this->SetWindowTitle) {
   958         _this->SetWindowTitle(_this, window);
   959     }
   960 }
   961 
   962 const char *
   963 SDL_GetWindowTitle(SDL_WindowID windowID)
   964 {
   965     SDL_Window *window = SDL_GetWindowFromID(windowID);
   966 
   967     if (!window) {
   968         return NULL;
   969     }
   970     return window->title;
   971 }
   972 
   973 void
   974 SDL_SetWindowData(SDL_WindowID windowID, void *userdata)
   975 {
   976     SDL_Window *window = SDL_GetWindowFromID(windowID);
   977 
   978     if (!window) {
   979         return;
   980     }
   981     window->userdata = userdata;
   982 }
   983 
   984 void *
   985 SDL_GetWindowData(SDL_WindowID windowID)
   986 {
   987     SDL_Window *window = SDL_GetWindowFromID(windowID);
   988 
   989     if (!window) {
   990         return NULL;
   991     }
   992     return window->userdata;
   993 }
   994 
   995 void
   996 SDL_SetWindowPosition(SDL_WindowID windowID, int x, int y)
   997 {
   998     SDL_Window *window = SDL_GetWindowFromID(windowID);
   999     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1000 
  1001     if (!window) {
  1002         return;
  1003     }
  1004     if (x == SDL_WINDOWPOS_CENTERED) {
  1005         window->x = (display->current_mode.w - window->w) / 2;
  1006     } else if (x != SDL_WINDOWPOS_UNDEFINED) {
  1007         window->x = x;
  1008     }
  1009     if (y == SDL_WINDOWPOS_CENTERED) {
  1010         window->y = (display->current_mode.h - window->h) / 2;
  1011     } else if (y != SDL_WINDOWPOS_UNDEFINED) {
  1012         window->y = y;
  1013     }
  1014     if (_this->SetWindowPosition) {
  1015         _this->SetWindowPosition(_this, window);
  1016     }
  1017 }
  1018 
  1019 void
  1020 SDL_GetWindowPosition(SDL_WindowID windowID, int *x, int *y)
  1021 {
  1022     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1023 
  1024     if (!window) {
  1025         return;
  1026     }
  1027     if (x) {
  1028         *x = window->x;
  1029     }
  1030     if (y) {
  1031         *y = window->y;
  1032     }
  1033 }
  1034 
  1035 void
  1036 SDL_SetWindowSize(SDL_WindowID windowID, int w, int h)
  1037 {
  1038     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1039 
  1040     if (!window) {
  1041         return;
  1042     }
  1043     window->w = w;
  1044     window->h = h;
  1045 
  1046     if (_this->SetWindowSize) {
  1047         _this->SetWindowSize(_this, window);
  1048     }
  1049     SDL_OnWindowResized(window);
  1050 }
  1051 
  1052 void
  1053 SDL_GetWindowSize(SDL_WindowID windowID, int *w, int *h)
  1054 {
  1055     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1056 
  1057     if (!window) {
  1058         if (w) {
  1059             *w = window->w;
  1060         }
  1061         if (h) {
  1062             *h = window->h;
  1063         }
  1064     } else {
  1065         if (w) {
  1066             *w = 0;
  1067         }
  1068         if (h) {
  1069             *h = 0;
  1070         }
  1071     }
  1072 }
  1073 
  1074 void
  1075 SDL_ShowWindow(SDL_WindowID windowID)
  1076 {
  1077     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1078 
  1079     if (!window || (window->flags & SDL_WINDOW_SHOWN)) {
  1080         return;
  1081     }
  1082     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_SHOWN, 0, 0);
  1083 
  1084     if (_this->ShowWindow) {
  1085         _this->ShowWindow(_this, window);
  1086     }
  1087 }
  1088 
  1089 void
  1090 SDL_HideWindow(SDL_WindowID windowID)
  1091 {
  1092     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1093 
  1094     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1095         return;
  1096     }
  1097     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_HIDDEN, 0, 0);
  1098 
  1099     if (_this->HideWindow) {
  1100         _this->HideWindow(_this, window);
  1101     }
  1102 }
  1103 
  1104 void
  1105 SDL_RaiseWindow(SDL_WindowID windowID)
  1106 {
  1107     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1108 
  1109     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1110         return;
  1111     }
  1112     if (_this->RaiseWindow) {
  1113         _this->RaiseWindow(_this, window);
  1114     }
  1115 }
  1116 
  1117 void
  1118 SDL_MaximizeWindow(SDL_WindowID windowID)
  1119 {
  1120     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1121 
  1122     if (!window || (window->flags & SDL_WINDOW_MAXIMIZED)) {
  1123         return;
  1124     }
  1125     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MAXIMIZED, 0, 0);
  1126 
  1127     if (_this->MaximizeWindow) {
  1128         _this->MaximizeWindow(_this, window);
  1129     }
  1130 }
  1131 
  1132 void
  1133 SDL_MinimizeWindow(SDL_WindowID windowID)
  1134 {
  1135     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1136 
  1137     if (!window || (window->flags & SDL_WINDOW_MINIMIZED)) {
  1138         return;
  1139     }
  1140     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MINIMIZED, 0, 0);
  1141 
  1142     if (_this->MinimizeWindow) {
  1143         _this->MinimizeWindow(_this, window);
  1144     }
  1145 }
  1146 
  1147 void
  1148 SDL_RestoreWindow(SDL_WindowID windowID)
  1149 {
  1150     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1151 
  1152     if (!window
  1153         || (window->flags & (SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED))) {
  1154         return;
  1155     }
  1156     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_RESTORED, 0, 0);
  1157 
  1158     if (_this->RestoreWindow) {
  1159         _this->RestoreWindow(_this, window);
  1160     }
  1161 }
  1162 
  1163 int
  1164 SDL_SetWindowFullscreen(SDL_WindowID windowID, int fullscreen)
  1165 {
  1166     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1167 
  1168     if (!window) {
  1169         return -1;
  1170     }
  1171     if (fullscreen) {
  1172         fullscreen = SDL_WINDOW_FULLSCREEN;
  1173     }
  1174     if ((window->flags & SDL_WINDOW_FULLSCREEN) == fullscreen) {
  1175         return 0;
  1176     }
  1177     if (fullscreen) {
  1178         window->flags |= SDL_WINDOW_FULLSCREEN;
  1179 
  1180         if (FULLSCREEN_VISIBLE(window)) {
  1181             SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1182 
  1183             /* Hide any other fullscreen windows */
  1184             int i;
  1185             for (i = 0; i < display->num_windows; ++i) {
  1186                 SDL_Window *other = &display->windows[i];
  1187                 if (other->id != windowID && FULLSCREEN_VISIBLE(other)) {
  1188                     SDL_MinimizeWindow(other->id);
  1189                 }
  1190             }
  1191 
  1192             SDL_SetDisplayMode(&display->fullscreen_mode);
  1193         }
  1194     } else {
  1195         window->flags &= ~SDL_WINDOW_FULLSCREEN;
  1196 
  1197         if (FULLSCREEN_VISIBLE(window)) {
  1198             SDL_SetDisplayMode(NULL);
  1199         }
  1200     }
  1201     return 0;
  1202 }
  1203 
  1204 void
  1205 SDL_SetWindowGrab(SDL_WindowID windowID, int mode)
  1206 {
  1207     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1208 
  1209     if (!window || (!!mode == !!(window->flags & SDL_WINDOW_INPUT_GRABBED))) {
  1210         return;
  1211     }
  1212     if (mode) {
  1213         window->flags |= SDL_WINDOW_INPUT_GRABBED;
  1214     } else {
  1215         window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
  1216     }
  1217 
  1218     if ((window->flags & SDL_WINDOW_INPUT_FOCUS) && _this->SetWindowGrab) {
  1219         _this->SetWindowGrab(_this, window);
  1220     }
  1221 }
  1222 
  1223 int
  1224 SDL_GetWindowGrab(SDL_WindowID windowID)
  1225 {
  1226     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1227 
  1228     if (!window) {
  1229         return 0;
  1230     }
  1231     return ((window->flags & SDL_WINDOW_INPUT_GRABBED) != 0);
  1232 }
  1233 
  1234 void
  1235 SDL_OnWindowShown(SDL_Window * window)
  1236 {
  1237 }
  1238 
  1239 void
  1240 SDL_OnWindowHidden(SDL_Window * window)
  1241 {
  1242 }
  1243 
  1244 void
  1245 SDL_OnWindowResized(SDL_Window * window)
  1246 {
  1247     SDL_Renderer *renderer = window->renderer;
  1248 
  1249     if (renderer && renderer->DisplayModeChanged) {
  1250         renderer->DisplayModeChanged(renderer);
  1251     }
  1252 }
  1253 
  1254 void
  1255 SDL_OnWindowFocusGained(SDL_Window * window)
  1256 {
  1257     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1258 
  1259     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1260         SDL_SetDisplayMode(&display->fullscreen_mode);
  1261     }
  1262     if (display->gamma && _this->SetDisplayGammaRamp) {
  1263         _this->SetDisplayGammaRamp(_this, display->gamma);
  1264     }
  1265     if ((window->flags & SDL_WINDOW_INPUT_GRABBED) && _this->SetWindowGrab) {
  1266         _this->SetWindowGrab(_this, window);
  1267     }
  1268 }
  1269 
  1270 void
  1271 SDL_OnWindowFocusLost(SDL_Window * window)
  1272 {
  1273     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1274 
  1275     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1276         SDL_MinimizeWindow(window->id);
  1277         SDL_SetDisplayMode(NULL);
  1278     }
  1279     if (display->gamma && _this->SetDisplayGammaRamp) {
  1280         _this->SetDisplayGammaRamp(_this, display->saved_gamma);
  1281     }
  1282     if ((window->flags & SDL_WINDOW_INPUT_GRABBED) && _this->SetWindowGrab) {
  1283         _this->SetWindowGrab(_this, window);
  1284     }
  1285 }
  1286 
  1287 SDL_WindowID
  1288 SDL_GetFocusWindow(void)
  1289 {
  1290     SDL_VideoDisplay *display;
  1291     int i;
  1292 
  1293     if (!_this) {
  1294         return 0;
  1295     }
  1296     display = &SDL_CurrentDisplay;
  1297     for (i = 0; i < display->num_windows; ++i) {
  1298         SDL_Window *window = &display->windows[i];
  1299 
  1300         if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
  1301             return window->id;
  1302         }
  1303     }
  1304     return 0;
  1305 }
  1306 
  1307 void
  1308 SDL_DestroyWindow(SDL_WindowID windowID)
  1309 {
  1310     int i, j;
  1311 
  1312     if (!_this) {
  1313         return;
  1314     }
  1315     /* Restore video mode, etc. */
  1316     SDL_SendWindowEvent(windowID, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
  1317 
  1318     for (i = 0; i < _this->num_displays; ++i) {
  1319         SDL_VideoDisplay *display = &_this->displays[i];
  1320         for (j = 0; j < display->num_windows; ++j) {
  1321             SDL_Window *window = &display->windows[j];
  1322             if (window->id != windowID) {
  1323                 continue;
  1324             }
  1325             if (window->title) {
  1326                 SDL_free(window->title);
  1327                 window->title = NULL;
  1328             }
  1329             if (window->renderer) {
  1330                 SDL_DestroyRenderer(window->id);
  1331                 window->renderer = NULL;
  1332             }
  1333             if (_this->DestroyWindow) {
  1334                 _this->DestroyWindow(_this, window);
  1335             }
  1336             if (j != display->num_windows - 1) {
  1337                 SDL_memcpy(&display->windows[i],
  1338                            &display->windows[i + 1],
  1339                            (display->num_windows - i - 1) * sizeof(*window));
  1340             }
  1341             --display->num_windows;
  1342             return;
  1343         }
  1344     }
  1345 }
  1346 
  1347 void
  1348 SDL_AddRenderDriver(int displayIndex, const SDL_RenderDriver * driver)
  1349 {
  1350     SDL_VideoDisplay *display;
  1351     SDL_RenderDriver *render_drivers;
  1352 
  1353     if (displayIndex >= _this->num_displays) {
  1354         return;
  1355     }
  1356     display = &_this->displays[displayIndex];
  1357 
  1358     render_drivers =
  1359         SDL_realloc(display->render_drivers,
  1360                     (display->num_render_drivers +
  1361                      1) * sizeof(*render_drivers));
  1362     if (render_drivers) {
  1363         render_drivers[display->num_render_drivers] = *driver;
  1364         display->render_drivers = render_drivers;
  1365         display->num_render_drivers++;
  1366     }
  1367 }
  1368 
  1369 int
  1370 SDL_GetNumRenderDrivers(void)
  1371 {
  1372     if (_this) {
  1373         return SDL_CurrentDisplay.num_render_drivers;
  1374     }
  1375     return 0;
  1376 }
  1377 
  1378 int
  1379 SDL_GetRenderDriverInfo(int index, SDL_RendererInfo * info)
  1380 {
  1381     if (!_this) {
  1382         SDL_UninitializedVideo();
  1383         return -1;
  1384     }
  1385     if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
  1386         SDL_SetError("index must be in the range of 0 - %d",
  1387                      SDL_GetNumRenderDrivers() - 1);
  1388         return -1;
  1389     }
  1390     *info = SDL_CurrentDisplay.render_drivers[index].info;
  1391     return 0;
  1392 }
  1393 
  1394 int
  1395 SDL_CreateRenderer(SDL_WindowID windowID, int index, Uint32 flags)
  1396 {
  1397     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1398 
  1399     if (!window) {
  1400         return 0;
  1401     }
  1402     if (index < 0) {
  1403         const char *override = SDL_getenv("SDL_VIDEO_RENDERER");
  1404         int n = SDL_GetNumRenderDrivers();
  1405         for (index = 0; index < n; ++index) {
  1406             SDL_RenderDriver *driver =
  1407                 &SDL_CurrentDisplay.render_drivers[index];
  1408 
  1409             if (override) {
  1410                 if (SDL_strcasecmp(override, driver->info.name) == 0) {
  1411                     break;
  1412                 }
  1413             } else {
  1414                 if ((driver->info.flags & flags) == flags) {
  1415                     break;
  1416                 }
  1417             }
  1418         }
  1419         if (index == n) {
  1420             SDL_SetError("Couldn't find matching render driver");
  1421             return -1;
  1422         }
  1423     }
  1424     if (index >= SDL_GetNumRenderDrivers()) {
  1425         SDL_SetError("index must be -1 or in the range of 0 - %d",
  1426                      SDL_GetNumRenderDrivers() - 1);
  1427         return -1;
  1428     }
  1429     /* Free any existing renderer */
  1430     SDL_DestroyRenderer(windowID);
  1431 
  1432     /* Create a new renderer instance */
  1433     window->renderer = SDL_CurrentDisplay.render_drivers[index]
  1434         .CreateRenderer(window, flags);
  1435     SDL_SelectRenderer(window->id);
  1436 
  1437     return 0;
  1438 }
  1439 
  1440 int
  1441 SDL_SelectRenderer(SDL_WindowID windowID)
  1442 {
  1443     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1444     SDL_Renderer *renderer;
  1445 
  1446     if (!window || !window->renderer) {
  1447         return -1;
  1448     }
  1449     renderer = window->renderer;
  1450     if (renderer && renderer->ActivateRenderer) {
  1451         if (renderer->ActivateRenderer(renderer) < 0) {
  1452             return -1;
  1453         }
  1454     }
  1455     SDL_CurrentDisplay.current_renderer = renderer;
  1456     return 0;
  1457 }
  1458 
  1459 int
  1460 SDL_GetRendererInfo(SDL_RendererInfo * info)
  1461 {
  1462     if (!_this) {
  1463         SDL_UninitializedVideo();
  1464         return -1;
  1465     }
  1466     if (!SDL_CurrentDisplay.current_renderer) {
  1467         SDL_SetError("There is no current renderer");
  1468         return -1;
  1469     }
  1470     *info = SDL_CurrentDisplay.current_renderer->info;
  1471     return 0;
  1472 }
  1473 
  1474 SDL_TextureID
  1475 SDL_CreateTexture(Uint32 format, int access, int w, int h)
  1476 {
  1477     int hash;
  1478     SDL_Renderer *renderer;
  1479     SDL_Texture *texture;
  1480 
  1481     if (!_this) {
  1482         SDL_UninitializedVideo();
  1483         return 0;
  1484     }
  1485     renderer = SDL_CurrentDisplay.current_renderer;
  1486     if (!renderer) {
  1487         return 0;
  1488     }
  1489     if (!renderer->CreateTexture) {
  1490         SDL_Unsupported();
  1491         return 0;
  1492     }
  1493     texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
  1494     if (!texture) {
  1495         SDL_OutOfMemory();
  1496         return 0;
  1497     }
  1498     texture->id = _this->next_object_id++;
  1499     texture->format = format;
  1500     texture->access = access;
  1501     texture->w = w;
  1502     texture->h = h;
  1503     texture->r = 255;
  1504     texture->g = 255;
  1505     texture->b = 255;
  1506     texture->a = 255;
  1507     texture->renderer = renderer;
  1508 
  1509     if (renderer->CreateTexture(renderer, texture) < 0) {
  1510         if (renderer->DestroyTexture) {
  1511             renderer->DestroyTexture(renderer, texture);
  1512         }
  1513         SDL_free(texture);
  1514         return 0;
  1515     }
  1516     hash = (texture->id % SDL_arraysize(SDL_CurrentDisplay.textures));
  1517     texture->next = SDL_CurrentDisplay.textures[hash];
  1518     SDL_CurrentDisplay.textures[hash] = texture;
  1519 
  1520     return texture->id;
  1521 }
  1522 
  1523 SDL_TextureID
  1524 SDL_CreateTextureFromSurface(Uint32 format, SDL_Surface * surface)
  1525 {
  1526     SDL_TextureID textureID;
  1527     SDL_PixelFormat *fmt;
  1528     int bpp;
  1529     Uint32 Rmask, Gmask, Bmask, Amask;
  1530 
  1531     if (!surface) {
  1532         SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
  1533         return 0;
  1534     }
  1535     fmt = surface->format;
  1536 
  1537     if (format) {
  1538         if (!SDL_PixelFormatEnumToMasks
  1539             (format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
  1540             SDL_SetError("Unknown pixel format");
  1541             return 0;
  1542         }
  1543     } else {
  1544         if (surface->format->Amask
  1545             || !(surface->map->info.flags &
  1546                  (SDL_COPY_COLORKEY | SDL_COPY_MASK | SDL_COPY_BLEND))) {
  1547             bpp = fmt->BitsPerPixel;
  1548             Rmask = fmt->Rmask;
  1549             Gmask = fmt->Gmask;
  1550             Bmask = fmt->Bmask;
  1551             Amask = fmt->Amask;
  1552         } else {
  1553             /* Need a format with alpha */
  1554             bpp = 32;
  1555             Rmask = 0x00FF0000;
  1556             Gmask = 0x0000FF00;
  1557             Bmask = 0x000000FF;
  1558             Amask = 0xFF000000;
  1559         }
  1560         format = SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
  1561         if (!format) {
  1562             SDL_SetError("Unknown pixel format");
  1563             return 0;
  1564         }
  1565     }
  1566 
  1567     textureID =
  1568         SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1569                           surface->h);
  1570     if (!textureID) {
  1571         return 0;
  1572     }
  1573     if (bpp == fmt->BitsPerPixel && Rmask == fmt->Rmask && Gmask == fmt->Gmask
  1574         && Bmask == fmt->Bmask && Amask == fmt->Amask) {
  1575         if (SDL_MUSTLOCK(surface)) {
  1576             if (SDL_LockSurface(surface) < 0) {
  1577                 SDL_DestroyTexture(textureID);
  1578                 return 0;
  1579             }
  1580             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1581                               surface->pitch);
  1582             SDL_UnlockSurface(surface);
  1583         } else {
  1584             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1585                               surface->pitch);
  1586         }
  1587     } else {
  1588         SDL_PixelFormat *dst_fmt;
  1589         SDL_Surface *dst = NULL;
  1590 
  1591         /* Set up a destination surface for the texture update */
  1592         dst_fmt = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
  1593         if (dst_fmt) {
  1594             if (SDL_ISPIXELFORMAT_INDEXED(format)) {
  1595                 dst_fmt->palette =
  1596                     SDL_AllocPalette((1 << SDL_BITSPERPIXEL(format)));
  1597                 if (dst_fmt->palette) {
  1598                     /*
  1599                      * FIXME: Should we try to copy
  1600                      * fmt->palette?
  1601                      */
  1602                     SDL_DitherColors(dst_fmt->palette->colors,
  1603                                      SDL_BITSPERPIXEL(format));
  1604                 }
  1605             }
  1606             dst = SDL_ConvertSurface(surface, dst_fmt, 0);
  1607             if (dst) {
  1608                 SDL_UpdateTexture(textureID, NULL, dst->pixels, dst->pitch);
  1609                 SDL_FreeSurface(dst);
  1610             }
  1611             if (dst_fmt->palette) {
  1612                 SDL_FreePalette(dst_fmt->palette);
  1613             }
  1614             SDL_FreeFormat(dst_fmt);
  1615         }
  1616         if (!dst) {
  1617             SDL_DestroyTexture(textureID);
  1618             return 0;
  1619         }
  1620     }
  1621 
  1622     if (SDL_ISPIXELFORMAT_INDEXED(format) && fmt->palette) {
  1623         SDL_SetTexturePalette(textureID, fmt->palette->colors, 0,
  1624                               fmt->palette->ncolors);
  1625     }
  1626     return textureID;
  1627 }
  1628 
  1629 static __inline__ SDL_Texture *
  1630 SDL_GetTextureFromID(SDL_TextureID textureID)
  1631 {
  1632     int hash;
  1633     SDL_Texture *texture;
  1634 
  1635     if (!_this) {
  1636         return NULL;
  1637     }
  1638     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  1639     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  1640          texture = texture->next) {
  1641         if (texture->id == textureID) {
  1642             return texture;
  1643         }
  1644     }
  1645     return NULL;
  1646 }
  1647 
  1648 int
  1649 SDL_QueryTexture(SDL_TextureID textureID, Uint32 * format, int *access,
  1650                  int *w, int *h)
  1651 {
  1652     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1653 
  1654     if (!texture) {
  1655         return -1;
  1656     }
  1657     if (format) {
  1658         *format = texture->format;
  1659     }
  1660     if (access) {
  1661         *access = texture->access;
  1662     }
  1663     if (w) {
  1664         *w = texture->w;
  1665     }
  1666     if (h) {
  1667         *h = texture->h;
  1668     }
  1669     return 0;
  1670 }
  1671 
  1672 int
  1673 SDL_QueryTexturePixels(SDL_TextureID textureID, void **pixels, int *pitch)
  1674 {
  1675     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1676     SDL_Renderer *renderer;
  1677 
  1678     if (!texture) {
  1679         return -1;
  1680     }
  1681     renderer = texture->renderer;
  1682     if (!renderer->QueryTexturePixels) {
  1683         SDL_Unsupported();
  1684         return -1;
  1685     }
  1686     return renderer->QueryTexturePixels(renderer, texture, pixels, pitch);
  1687 }
  1688 
  1689 int
  1690 SDL_SetTexturePalette(SDL_TextureID textureID, const SDL_Color * colors,
  1691                       int firstcolor, int ncolors)
  1692 {
  1693     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1694     SDL_Renderer *renderer;
  1695 
  1696     if (!texture) {
  1697         return -1;
  1698     }
  1699     renderer = texture->renderer;
  1700     if (!renderer->SetTexturePalette) {
  1701         SDL_Unsupported();
  1702         return -1;
  1703     }
  1704     return renderer->SetTexturePalette(renderer, texture, colors, firstcolor,
  1705                                        ncolors);
  1706 }
  1707 
  1708 int
  1709 SDL_GetTexturePalette(SDL_TextureID textureID, SDL_Color * colors,
  1710                       int firstcolor, int ncolors)
  1711 {
  1712     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1713     SDL_Renderer *renderer;
  1714 
  1715     if (!texture) {
  1716         return -1;
  1717     }
  1718     renderer = texture->renderer;
  1719     if (!renderer->GetTexturePalette) {
  1720         SDL_Unsupported();
  1721         return -1;
  1722     }
  1723     return renderer->GetTexturePalette(renderer, texture, colors, firstcolor,
  1724                                        ncolors);
  1725 }
  1726 
  1727 int
  1728 SDL_SetTextureColorMod(SDL_TextureID textureID, Uint8 r, Uint8 g, Uint8 b)
  1729 {
  1730     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1731     SDL_Renderer *renderer;
  1732 
  1733     if (!texture) {
  1734         return -1;
  1735     }
  1736     renderer = texture->renderer;
  1737     if (!renderer->SetTextureColorMod) {
  1738         SDL_Unsupported();
  1739         return -1;
  1740     }
  1741     if (r < 255 || g < 255 || b < 255) {
  1742         texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
  1743     } else {
  1744         texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
  1745     }
  1746     texture->r = r;
  1747     texture->g = g;
  1748     texture->b = b;
  1749     return renderer->SetTextureColorMod(renderer, texture);
  1750 }
  1751 
  1752 int
  1753 SDL_GetTextureColorMod(SDL_TextureID textureID, Uint8 * r, Uint8 * g,
  1754                        Uint8 * b)
  1755 {
  1756     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1757     SDL_Renderer *renderer;
  1758 
  1759     if (!texture) {
  1760         return -1;
  1761     }
  1762     renderer = texture->renderer;
  1763     if (r) {
  1764         *r = texture->r;
  1765     }
  1766     if (g) {
  1767         *g = texture->g;
  1768     }
  1769     if (b) {
  1770         *b = texture->b;
  1771     }
  1772     return 0;
  1773 }
  1774 
  1775 int
  1776 SDL_SetTextureAlphaMod(SDL_TextureID textureID, Uint8 alpha)
  1777 {
  1778     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1779     SDL_Renderer *renderer;
  1780 
  1781     if (!texture) {
  1782         return -1;
  1783     }
  1784     renderer = texture->renderer;
  1785     if (!renderer->SetTextureAlphaMod) {
  1786         SDL_Unsupported();
  1787         return -1;
  1788     }
  1789     if (alpha < 255) {
  1790         texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
  1791     } else {
  1792         texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
  1793     }
  1794     texture->a = alpha;
  1795     return renderer->SetTextureAlphaMod(renderer, texture);
  1796 }
  1797 
  1798 int
  1799 SDL_GetTextureAlphaMod(SDL_TextureID textureID, Uint8 * alpha)
  1800 {
  1801     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1802 
  1803     if (!texture) {
  1804         return -1;
  1805     }
  1806     if (alpha) {
  1807         *alpha = texture->a;
  1808     }
  1809     return 0;
  1810 }
  1811 
  1812 int
  1813 SDL_SetTextureBlendMode(SDL_TextureID textureID, int blendMode)
  1814 {
  1815     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1816     SDL_Renderer *renderer;
  1817 
  1818     if (!texture) {
  1819         return -1;
  1820     }
  1821     renderer = texture->renderer;
  1822     if (!renderer->SetTextureBlendMode) {
  1823         SDL_Unsupported();
  1824         return -1;
  1825     }
  1826     texture->blendMode = blendMode;
  1827     return renderer->SetTextureBlendMode(renderer, texture);
  1828 }
  1829 
  1830 int
  1831 SDL_GetTextureBlendMode(SDL_TextureID textureID, int *blendMode)
  1832 {
  1833     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1834 
  1835     if (!texture) {
  1836         return -1;
  1837     }
  1838     if (blendMode) {
  1839         *blendMode = texture->blendMode;
  1840     }
  1841     return 0;
  1842 }
  1843 
  1844 int
  1845 SDL_SetTextureScaleMode(SDL_TextureID textureID, int scaleMode)
  1846 {
  1847     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1848     SDL_Renderer *renderer;
  1849 
  1850     if (!texture) {
  1851         return -1;
  1852     }
  1853     renderer = texture->renderer;
  1854     if (!renderer->SetTextureScaleMode) {
  1855         SDL_Unsupported();
  1856         return -1;
  1857     }
  1858     texture->scaleMode = scaleMode;
  1859     return renderer->SetTextureScaleMode(renderer, texture);
  1860 }
  1861 
  1862 int
  1863 SDL_GetTextureScaleMode(SDL_TextureID textureID, int *scaleMode)
  1864 {
  1865     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1866 
  1867     if (!texture) {
  1868         return -1;
  1869     }
  1870     if (scaleMode) {
  1871         *scaleMode = texture->scaleMode;
  1872     }
  1873     return 0;
  1874 }
  1875 
  1876 int
  1877 SDL_UpdateTexture(SDL_TextureID textureID, const SDL_Rect * rect,
  1878                   const void *pixels, int pitch)
  1879 {
  1880     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1881     SDL_Renderer *renderer;
  1882     SDL_Rect full_rect;
  1883 
  1884     if (!texture) {
  1885         return -1;
  1886     }
  1887     renderer = texture->renderer;
  1888     if (!renderer->UpdateTexture) {
  1889         SDL_Unsupported();
  1890         return -1;
  1891     }
  1892     if (!rect) {
  1893         full_rect.x = 0;
  1894         full_rect.y = 0;
  1895         full_rect.w = texture->w;
  1896         full_rect.h = texture->h;
  1897         rect = &full_rect;
  1898     }
  1899     return renderer->UpdateTexture(renderer, texture, rect, pixels, pitch);
  1900 }
  1901 
  1902 int
  1903 SDL_LockTexture(SDL_TextureID textureID, const SDL_Rect * rect, int markDirty,
  1904                 void **pixels, int *pitch)
  1905 {
  1906     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1907     SDL_Renderer *renderer;
  1908     SDL_Rect full_rect;
  1909 
  1910     if (!texture) {
  1911         return -1;
  1912     }
  1913     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1914         SDL_SetError("SDL_LockTexture(): texture must be streaming");
  1915         return -1;
  1916     }
  1917     renderer = texture->renderer;
  1918     if (!renderer->LockTexture) {
  1919         SDL_Unsupported();
  1920         return -1;
  1921     }
  1922     if (!rect) {
  1923         full_rect.x = 0;
  1924         full_rect.y = 0;
  1925         full_rect.w = texture->w;
  1926         full_rect.h = texture->h;
  1927         rect = &full_rect;
  1928     }
  1929     return renderer->LockTexture(renderer, texture, rect, markDirty, pixels,
  1930                                  pitch);
  1931 }
  1932 
  1933 void
  1934 SDL_UnlockTexture(SDL_TextureID textureID)
  1935 {
  1936     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1937     SDL_Renderer *renderer;
  1938 
  1939     if (!texture) {
  1940         return;
  1941     }
  1942     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1943         return;
  1944     }
  1945     renderer = texture->renderer;
  1946     if (!renderer->UnlockTexture) {
  1947         return;
  1948     }
  1949     renderer->UnlockTexture(renderer, texture);
  1950 }
  1951 
  1952 void
  1953 SDL_DirtyTexture(SDL_TextureID textureID, int numrects,
  1954                  const SDL_Rect * rects)
  1955 {
  1956     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1957     SDL_Renderer *renderer;
  1958 
  1959     if (!texture) {
  1960         return;
  1961     }
  1962     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1963         return;
  1964     }
  1965     renderer = texture->renderer;
  1966     if (!renderer->DirtyTexture) {
  1967         return;
  1968     }
  1969     renderer->DirtyTexture(renderer, texture, numrects, rects);
  1970 }
  1971 
  1972 int
  1973 SDL_RenderFill(Uint8 r, Uint8 g, Uint8 b, Uint8 a, const SDL_Rect * rect)
  1974 {
  1975     SDL_Renderer *renderer;
  1976     SDL_Window *window;
  1977     SDL_Rect real_rect;
  1978 
  1979     if (!_this) {
  1980         SDL_UninitializedVideo();
  1981         return -1;
  1982     }
  1983     renderer = SDL_CurrentDisplay.current_renderer;
  1984     if (!renderer) {
  1985         return -1;
  1986     }
  1987     if (!renderer->RenderFill) {
  1988         SDL_Unsupported();
  1989         return -1;
  1990     }
  1991     window = SDL_GetWindowFromID(renderer->window);
  1992     real_rect.x = 0;
  1993     real_rect.y = 0;
  1994     real_rect.w = window->w;
  1995     real_rect.h = window->h;
  1996     if (rect) {
  1997         if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
  1998             return 0;
  1999         }
  2000     }
  2001     return renderer->RenderFill(renderer, r, g, b, a, &real_rect);
  2002 }
  2003 
  2004 int
  2005 SDL_RenderCopy(SDL_TextureID textureID, const SDL_Rect * srcrect,
  2006                const SDL_Rect * dstrect)
  2007 {
  2008     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2009     SDL_Renderer *renderer;
  2010     SDL_Window *window;
  2011     SDL_Rect real_srcrect;
  2012     SDL_Rect real_dstrect;
  2013 
  2014     if (!texture || texture->renderer != SDL_CurrentDisplay.current_renderer) {
  2015         return -1;
  2016     }
  2017     renderer = SDL_CurrentDisplay.current_renderer;
  2018     if (!renderer) {
  2019         return -1;
  2020     }
  2021     if (!renderer->RenderCopy) {
  2022         SDL_Unsupported();
  2023         return -1;
  2024     }
  2025     window = SDL_GetWindowFromID(renderer->window);
  2026     if (srcrect) {
  2027         real_srcrect = *srcrect;
  2028     } else {
  2029         real_srcrect.x = 0;
  2030         real_srcrect.y = 0;
  2031         real_srcrect.w = texture->w;
  2032         real_srcrect.h = texture->h;
  2033     }
  2034     if (dstrect) {
  2035         real_dstrect = *dstrect;
  2036     } else {
  2037         real_dstrect.x = 0;
  2038         real_dstrect.y = 0;
  2039         real_dstrect.w = window->w;
  2040         real_dstrect.h = window->h;
  2041     }
  2042 
  2043     return renderer->RenderCopy(renderer, texture, &real_srcrect,
  2044                                 &real_dstrect);
  2045 }
  2046 
  2047 void
  2048 SDL_RenderPresent(void)
  2049 {
  2050     SDL_Renderer *renderer;
  2051 
  2052     if (!_this) {
  2053         SDL_UninitializedVideo();
  2054         return;
  2055     }
  2056     renderer = SDL_CurrentDisplay.current_renderer;
  2057     if (!renderer || !renderer->RenderPresent) {
  2058         return;
  2059     }
  2060     renderer->RenderPresent(renderer);
  2061 }
  2062 
  2063 void
  2064 SDL_DestroyTexture(SDL_TextureID textureID)
  2065 {
  2066     int hash;
  2067     SDL_Texture *prev, *texture;
  2068     SDL_Renderer *renderer;
  2069 
  2070     if (!_this) {
  2071         SDL_UninitializedVideo();
  2072         return;
  2073     }
  2074     /* Look up the texture in the hash table */
  2075     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  2076     prev = NULL;
  2077     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  2078          prev = texture, texture = texture->next) {
  2079         if (texture->id == textureID) {
  2080             break;
  2081         }
  2082     }
  2083     if (!texture) {
  2084         return;
  2085     }
  2086     /* Unlink the texture from the list */
  2087     if (prev) {
  2088         prev->next = texture->next;
  2089     } else {
  2090         SDL_CurrentDisplay.textures[hash] = texture->next;
  2091     }
  2092 
  2093     /* Free the texture */
  2094     renderer = texture->renderer;
  2095     renderer->DestroyTexture(renderer, texture);
  2096     SDL_free(texture);
  2097 }
  2098 
  2099 void
  2100 SDL_DestroyRenderer(SDL_WindowID windowID)
  2101 {
  2102     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2103     SDL_Renderer *renderer;
  2104     int i;
  2105 
  2106     if (!window) {
  2107         return;
  2108     }
  2109     renderer = window->renderer;
  2110     if (!renderer) {
  2111         return;
  2112     }
  2113     /* Free existing textures for this renderer */
  2114     for (i = 0; i < SDL_arraysize(SDL_CurrentDisplay.textures); ++i) {
  2115         SDL_Texture *texture;
  2116         SDL_Texture *prev = NULL;
  2117         SDL_Texture *next;
  2118         for (texture = SDL_CurrentDisplay.textures[i]; texture;
  2119              texture = next) {
  2120             next = texture->next;
  2121             if (texture->renderer == renderer) {
  2122                 if (prev) {
  2123                     prev->next = next;
  2124                 } else {
  2125                     SDL_CurrentDisplay.textures[i] = next;
  2126                 }
  2127                 renderer->DestroyTexture(renderer, texture);
  2128                 SDL_free(texture);
  2129             } else {
  2130                 prev = texture;
  2131             }
  2132         }
  2133     }
  2134 
  2135     /* Free the renderer instance */
  2136     renderer->DestroyRenderer(renderer);
  2137 
  2138     /* Clear references */
  2139     window->renderer = NULL;
  2140     if (SDL_CurrentDisplay.current_renderer == renderer) {
  2141         SDL_CurrentDisplay.current_renderer = NULL;
  2142     }
  2143 }
  2144 
  2145 void
  2146 SDL_VideoQuit(void)
  2147 {
  2148     int i, j;
  2149 
  2150     if (!_this) {
  2151         return;
  2152     }
  2153     /* Halt event processing before doing anything else */
  2154     SDL_StopEventLoop();
  2155 
  2156     /* Clean up the system video */
  2157     for (i = _this->num_displays; i--;) {
  2158         SDL_VideoDisplay *display = &_this->displays[i];
  2159         for (j = display->num_windows; j--;) {
  2160             SDL_DestroyWindow(display->windows[i].id);
  2161         }
  2162         if (display->windows) {
  2163             SDL_free(display->windows);
  2164             display->windows = NULL;
  2165         }
  2166         display->num_windows = 0;
  2167         if (display->render_drivers) {
  2168             SDL_free(display->render_drivers);
  2169             display->render_drivers = NULL;
  2170         }
  2171         display->num_render_drivers = 0;
  2172     }
  2173     _this->VideoQuit(_this);
  2174 
  2175     for (i = _this->num_displays; i--;) {
  2176         SDL_VideoDisplay *display = &_this->displays[i];
  2177         for (j = display->num_display_modes; j--;) {
  2178             if (display->display_modes[j].driverdata) {
  2179                 SDL_free(display->display_modes[j].driverdata);
  2180                 display->display_modes[j].driverdata = NULL;
  2181             }
  2182         }
  2183         if (display->display_modes) {
  2184             SDL_free(display->display_modes);
  2185             display->display_modes = NULL;
  2186         }
  2187         if (display->desktop_mode.driverdata) {
  2188             SDL_free(display->desktop_mode.driverdata);
  2189             display->desktop_mode.driverdata = NULL;
  2190         }
  2191         if (display->palette) {
  2192             SDL_FreePalette(display->palette);
  2193             display->palette = NULL;
  2194         }
  2195         if (display->gamma) {
  2196             SDL_free(display->gamma);
  2197             display->gamma = NULL;
  2198         }
  2199         if (display->driverdata) {
  2200             SDL_free(display->driverdata);
  2201             display->driverdata = NULL;
  2202         }
  2203     }
  2204     if (_this->displays) {
  2205         SDL_free(_this->displays);
  2206         _this->displays = NULL;
  2207     }
  2208     _this->free(_this);
  2209     _this = NULL;
  2210 }
  2211 
  2212 int
  2213 SDL_GL_LoadLibrary(const char *path)
  2214 {
  2215     int retval;
  2216 
  2217     if (!_this) {
  2218         SDL_UninitializedVideo();
  2219         return -1;
  2220     }
  2221     if (_this->GL_LoadLibrary) {
  2222         retval = _this->GL_LoadLibrary(_this, path);
  2223     } else {
  2224         SDL_SetError("No dynamic GL support in video driver");
  2225         retval = -1;
  2226     }
  2227     return (retval);
  2228 }
  2229 
  2230 void *
  2231 SDL_GL_GetProcAddress(const char *proc)
  2232 {
  2233     void *func;
  2234 
  2235     if (!_this) {
  2236         SDL_UninitializedVideo();
  2237         return NULL;
  2238     }
  2239     func = NULL;
  2240     if (_this->GL_GetProcAddress) {
  2241         if (_this->gl_config.driver_loaded) {
  2242             func = _this->GL_GetProcAddress(_this, proc);
  2243         } else {
  2244             SDL_SetError("No GL driver has been loaded");
  2245         }
  2246     } else {
  2247         SDL_SetError("No dynamic GL support in video driver");
  2248     }
  2249     return func;
  2250 }
  2251 
  2252 SDL_bool
  2253 SDL_GL_ExtensionSupported(const char *extension)
  2254 {
  2255 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2256     const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
  2257     const char *extensions;
  2258     const char *start;
  2259     const char *where, *terminator;
  2260 
  2261     /* Extension names should not have spaces. */
  2262     where = SDL_strchr(extension, ' ');
  2263     if (where || *extension == '\0') {
  2264         return SDL_FALSE;
  2265     }
  2266     /* See if there's an environment variable override */
  2267     start = SDL_getenv(extension);
  2268     if (start && *start == '0') {
  2269         return SDL_FALSE;
  2270     }
  2271     /* Lookup the available extensions */
  2272     glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
  2273     if (glGetStringFunc) {
  2274         extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
  2275     } else {
  2276         extensions = NULL;
  2277     }
  2278     if (!extensions) {
  2279         return SDL_FALSE;
  2280     }
  2281     /*
  2282      * It takes a bit of care to be fool-proof about parsing the OpenGL
  2283      * extensions string. Don't be fooled by sub-strings, etc.
  2284      */
  2285 
  2286     start = extensions;
  2287 
  2288     for (;;) {
  2289         where = SDL_strstr(start, extension);
  2290         if (!where)
  2291             break;
  2292 
  2293         terminator = where + SDL_strlen(extension);
  2294         if (where == start || *(where - 1) == ' ')
  2295             if (*terminator == ' ' || *terminator == '\0')
  2296                 return SDL_TRUE;
  2297 
  2298         start = terminator;
  2299     }
  2300     return SDL_FALSE;
  2301 #else
  2302     return SDL_FALSE;
  2303 #endif
  2304 }
  2305 
  2306 int
  2307 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
  2308 {
  2309 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2310     int retval;
  2311 
  2312     if (!_this) {
  2313         SDL_UninitializedVideo();
  2314         return -1;
  2315     }
  2316     retval = 0;
  2317     switch (attr) {
  2318     case SDL_GL_RED_SIZE:
  2319         _this->gl_config.red_size = value;
  2320         break;
  2321     case SDL_GL_GREEN_SIZE:
  2322         _this->gl_config.green_size = value;
  2323         break;
  2324     case SDL_GL_BLUE_SIZE:
  2325         _this->gl_config.blue_size = value;
  2326         break;
  2327     case SDL_GL_ALPHA_SIZE:
  2328         _this->gl_config.alpha_size = value;
  2329         break;
  2330     case SDL_GL_DOUBLEBUFFER:
  2331         _this->gl_config.double_buffer = value;
  2332         break;
  2333     case SDL_GL_BUFFER_SIZE:
  2334         _this->gl_config.buffer_size = value;
  2335         break;
  2336     case SDL_GL_DEPTH_SIZE:
  2337         _this->gl_config.depth_size = value;
  2338         break;
  2339     case SDL_GL_STENCIL_SIZE:
  2340         _this->gl_config.stencil_size = value;
  2341         break;
  2342     case SDL_GL_ACCUM_RED_SIZE:
  2343         _this->gl_config.accum_red_size = value;
  2344         break;
  2345     case SDL_GL_ACCUM_GREEN_SIZE:
  2346         _this->gl_config.accum_green_size = value;
  2347         break;
  2348     case SDL_GL_ACCUM_BLUE_SIZE:
  2349         _this->gl_config.accum_blue_size = value;
  2350         break;
  2351     case SDL_GL_ACCUM_ALPHA_SIZE:
  2352         _this->gl_config.accum_alpha_size = value;
  2353         break;
  2354     case SDL_GL_STEREO:
  2355         _this->gl_config.stereo = value;
  2356         break;
  2357     case SDL_GL_MULTISAMPLEBUFFERS:
  2358         _this->gl_config.multisamplebuffers = value;
  2359         break;
  2360     case SDL_GL_MULTISAMPLESAMPLES:
  2361         _this->gl_config.multisamplesamples = value;
  2362         break;
  2363     case SDL_GL_ACCELERATED_VISUAL:
  2364         _this->gl_config.accelerated = value;
  2365         break;
  2366     case SDL_GL_RETAINED_BACKING:
  2367         _this->gl_config.retained_backing = value;
  2368         break;
  2369     default:
  2370         SDL_SetError("Unknown OpenGL attribute");
  2371         retval = -1;
  2372         break;
  2373     }
  2374     return retval;
  2375 #else
  2376     SDL_Unsupported();
  2377     return -1;
  2378 #endif /* SDL_VIDEO_OPENGL */
  2379 }
  2380 
  2381 int
  2382 SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
  2383 {
  2384 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2385     void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2386     GLenum attrib = 0;
  2387 
  2388     glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2389     if (!glGetIntegervFunc) {
  2390         return -1;
  2391     }
  2392     switch (attr) {
  2393     case SDL_GL_RETAINED_BACKING:
  2394         *value = _this->gl_config.retained_backing;
  2395         return 0;
  2396     case SDL_GL_RED_SIZE:
  2397         attrib = GL_RED_BITS;
  2398         break;
  2399     case SDL_GL_BLUE_SIZE:
  2400         attrib = GL_BLUE_BITS;
  2401         break;
  2402     case SDL_GL_GREEN_SIZE:
  2403         attrib = GL_GREEN_BITS;
  2404         break;
  2405     case SDL_GL_ALPHA_SIZE:
  2406         attrib = GL_ALPHA_BITS;
  2407         break;
  2408     case SDL_GL_DOUBLEBUFFER:
  2409 #ifndef SDL_VIDEO_OPENGL_ES
  2410         attrib = GL_DOUBLEBUFFER;
  2411         break;
  2412 #else
  2413         /*
  2414          * I believe double buffering is the only option in OpenGL ES
  2415          * -- in any case, GL_DOUBLEBUFFER doesn't exist
  2416          */
  2417         *value = 1;
  2418         return 0;
  2419 #endif
  2420     case SDL_GL_DEPTH_SIZE:
  2421         attrib = GL_DEPTH_BITS;
  2422         break;
  2423     case SDL_GL_STENCIL_SIZE:
  2424         attrib = GL_STENCIL_BITS;
  2425         break;
  2426 #ifndef SDL_VIDEO_OPENGL_ES
  2427     case SDL_GL_ACCUM_RED_SIZE:
  2428         attrib = GL_ACCUM_RED_BITS;
  2429         break;
  2430     case SDL_GL_ACCUM_GREEN_SIZE:
  2431         attrib = GL_ACCUM_GREEN_BITS;
  2432         break;
  2433     case SDL_GL_ACCUM_BLUE_SIZE:
  2434         attrib = GL_ACCUM_BLUE_BITS;
  2435         break;
  2436     case SDL_GL_ACCUM_ALPHA_SIZE:
  2437         attrib = GL_ACCUM_ALPHA_BITS;
  2438         break;
  2439     case SDL_GL_STEREO:
  2440         attrib = GL_STEREO;
  2441         break;
  2442 #else
  2443     case SDL_GL_ACCUM_RED_SIZE:
  2444     case SDL_GL_ACCUM_GREEN_SIZE:
  2445     case SDL_GL_ACCUM_BLUE_SIZE:
  2446     case SDL_GL_ACCUM_ALPHA_SIZE:
  2447     case SDL_GL_STEREO:
  2448         /* none of these are supported in OpenGL ES */
  2449         *value = 0;
  2450         return 0;
  2451 #endif
  2452     case SDL_GL_MULTISAMPLEBUFFERS:
  2453 #ifndef SDL_VIDEO_OPENGL_ES
  2454         attrib = GL_SAMPLE_BUFFERS_ARB;
  2455 #else
  2456         attrib = GL_SAMPLE_BUFFERS;
  2457 #endif
  2458         break;
  2459     case SDL_GL_MULTISAMPLESAMPLES:
  2460 #ifndef SDL_VIDEO_OPENGL_ES
  2461         attrib = GL_SAMPLES_ARB;
  2462 #else
  2463         attrib = GL_SAMPLES;
  2464 #endif
  2465         break;
  2466     case SDL_GL_BUFFER_SIZE:
  2467         {
  2468             GLint bits = 0;
  2469             GLint component;
  2470 
  2471             /*
  2472              * there doesn't seem to be a single flag in OpenGL
  2473              * for this!
  2474              */
  2475             glGetIntegervFunc(GL_RED_BITS, &component);
  2476             bits += component;
  2477             glGetIntegervFunc(GL_GREEN_BITS, &component);
  2478             bits += component;
  2479             glGetIntegervFunc(GL_BLUE_BITS, &component);
  2480             bits += component;
  2481             glGetIntegervFunc(GL_ALPHA_BITS, &component);
  2482             bits += component;
  2483 
  2484             *value = bits;
  2485             return 0;
  2486         }
  2487     case SDL_GL_ACCELERATED_VISUAL:
  2488         {
  2489             /* FIXME: How do we get this information? */
  2490             *value = (_this->gl_config.accelerated != 0);
  2491             return 0;
  2492         }
  2493     default:
  2494         SDL_SetError("Unknown OpenGL attribute");
  2495         return -1;
  2496     }
  2497 
  2498     glGetIntegervFunc(attrib, (GLint *) value);
  2499     return 0;
  2500 #else
  2501     SDL_Unsupported();
  2502     return -1;
  2503 #endif /* SDL_VIDEO_OPENGL */
  2504 }
  2505 
  2506 SDL_GLContext
  2507 SDL_GL_CreateContext(SDL_WindowID windowID)
  2508 {
  2509     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2510 
  2511     if (!window) {
  2512         return NULL;
  2513     }
  2514     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2515         SDL_SetError("The specified window isn't an OpenGL window");
  2516         return NULL;
  2517     }
  2518     return _this->GL_CreateContext(_this, window);
  2519 }
  2520 
  2521 int
  2522 SDL_GL_MakeCurrent(SDL_WindowID windowID, SDL_GLContext context)
  2523 {
  2524     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2525 
  2526     if (window && !(window->flags & SDL_WINDOW_OPENGL)) {
  2527         SDL_SetError("The specified window isn't an OpenGL window");
  2528         return -1;
  2529     }
  2530     if (!context) {
  2531         window = NULL;
  2532     }
  2533     return _this->GL_MakeCurrent(_this, window, context);
  2534 }
  2535 
  2536 int
  2537 SDL_GL_SetSwapInterval(int interval)
  2538 {
  2539     if (!_this) {
  2540         SDL_UninitializedVideo();
  2541         return -1;
  2542     }
  2543     if (_this->GL_SetSwapInterval) {
  2544         return _this->GL_SetSwapInterval(_this, interval);
  2545     } else {
  2546         SDL_SetError("Setting the swap interval is not supported");
  2547         return -1;
  2548     }
  2549 }
  2550 
  2551 int
  2552 SDL_GL_GetSwapInterval(void)
  2553 {
  2554     if (!_this) {
  2555         SDL_UninitializedVideo();
  2556         return -1;
  2557     }
  2558     if (_this->GL_GetSwapInterval) {
  2559         return _this->GL_GetSwapInterval(_this);
  2560     } else {
  2561         SDL_SetError("Getting the swap interval is not supported");
  2562         return -1;
  2563     }
  2564 }
  2565 
  2566 void
  2567 SDL_GL_SwapWindow(SDL_WindowID windowID)
  2568 {
  2569     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2570 
  2571     if (!window) {
  2572         return;
  2573     }
  2574     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2575         SDL_SetError("The specified window isn't an OpenGL window");
  2576         return;
  2577     }
  2578     _this->GL_SwapWindow(_this, window);
  2579 }
  2580 
  2581 void
  2582 SDL_GL_DeleteContext(SDL_GLContext context)
  2583 {
  2584     if (!_this || !context) {
  2585         return;
  2586     }
  2587     _this->GL_MakeCurrent(_this, NULL, NULL);
  2588     _this->GL_DeleteContext(_this, context);
  2589 }
  2590 
  2591 #if 0                           // FIXME
  2592 /*
  2593  * Utility function used by SDL_WM_SetIcon(); flags & 1 for color key, flags
  2594  * & 2 for alpha channel.
  2595  */
  2596 static void
  2597 CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
  2598 {
  2599     int x, y;
  2600     Uint32 colorkey;
  2601 #define SET_MASKBIT(icon, x, y, mask) \
  2602 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  2603 
  2604     colorkey = icon->format->colorkey;
  2605     switch (icon->format->BytesPerPixel) {
  2606     case 1:
  2607         {
  2608             Uint8 *pixels;
  2609             for (y = 0; y < icon->h; ++y) {
  2610                 pixels = (Uint8 *) icon->pixels + y * icon->pitch;
  2611                 for (x = 0; x < icon->w; ++x) {
  2612                     if (*pixels++ == colorkey) {
  2613                         SET_MASKBIT(icon, x, y, mask);
  2614                     }
  2615                 }
  2616             }
  2617         }
  2618         break;
  2619 
  2620     case 2:
  2621         {
  2622             Uint16 *pixels;
  2623             for (y = 0; y < icon->h; ++y) {
  2624                 pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
  2625                 for (x = 0; x < icon->w; ++x) {
  2626                     if ((flags & 1) && *pixels == colorkey) {
  2627                         SET_MASKBIT(icon, x, y, mask);
  2628                     } else if ((flags & 2)
  2629                                && (*pixels & icon->format->Amask) == 0) {
  2630                         SET_MASKBIT(icon, x, y, mask);
  2631                     }
  2632                     pixels++;
  2633                 }
  2634             }
  2635         }
  2636         break;
  2637 
  2638     case 4:
  2639         {
  2640             Uint32 *pixels;
  2641             for (y = 0; y < icon->h; ++y) {
  2642                 pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
  2643                 for (x = 0; x < icon->w; ++x) {
  2644                     if ((flags & 1) && *pixels == colorkey) {
  2645                         SET_MASKBIT(icon, x, y, mask);
  2646                     } else if ((flags & 2)
  2647                                && (*pixels & icon->format->Amask) == 0) {
  2648                         SET_MASKBIT(icon, x, y, mask);
  2649                     }
  2650                     pixels++;
  2651                 }
  2652             }
  2653         }
  2654         break;
  2655     }
  2656 }
  2657 
  2658 /*
  2659  * Sets the window manager icon for the display window.
  2660  */
  2661 void
  2662 SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
  2663 {
  2664     if (icon && _this->SetIcon) {
  2665         /* Generate a mask if necessary, and create the icon! */
  2666         if (mask == NULL) {
  2667             int mask_len = icon->h * (icon->w + 7) / 8;
  2668             int flags = 0;
  2669             mask = (Uint8 *) SDL_malloc(mask_len);
  2670             if (mask == NULL) {
  2671                 return;
  2672             }
  2673             SDL_memset(mask, ~0, mask_len);
  2674             if (icon->flags & SDL_SRCCOLORKEY)
  2675                 flags |= 1;
  2676             if (icon->flags & SDL_SRCALPHA)
  2677                 flags |= 2;
  2678             if (flags) {
  2679                 CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  2680             }
  2681             _this->SetIcon(_this, icon, mask);
  2682             SDL_free(mask);
  2683         } else {
  2684             _this->SetIcon(_this, icon, mask);
  2685         }
  2686     }
  2687 }
  2688 #endif
  2689 
  2690 SDL_bool
  2691 SDL_GetWindowWMInfo(SDL_WindowID windowID, struct SDL_SysWMinfo *info)
  2692 {
  2693     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2694 
  2695     if (!window || !_this->GetWindowWMInfo) {
  2696         return SDL_FALSE;
  2697     }
  2698     return (_this->GetWindowWMInfo(_this, window, info));
  2699 }
  2700 
  2701 /* vi: set ts=4 sw=4 expandtab: */