src/video/SDL_video.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 25 Nov 2008 05:29:14 +0000
changeset 2787 93764fe8601a
parent 2786 6bacfecbf27e
child 2789 985001797115
permissions -rw-r--r--
It turns out both the software and the OpenGL renderer had the same problem.
According to the spec, when SDL_SRCALPHA is set, the colorkey is ignored, so
we just need to convert the colorkey into the alpha channel.
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2006 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->h) &&
   492             (current->w < mode->w || current->h < mode->h)) {
   493             /* Out of sorted modes large enough here */
   494             break;
   495         }
   496         if (!match || current->w < match->w || current->h < match->h) {
   497             match = current;
   498             continue;
   499         }
   500         if (current->format != match->format) {
   501             /* Sorted highest depth to lowest */
   502             if (current->format == target_format ||
   503                 (SDL_BITSPERPIXEL(current->format) >=
   504                  SDL_BITSPERPIXEL(target_format)
   505                  && SDL_PIXELTYPE(current->format) ==
   506                  SDL_PIXELTYPE(target_format))) {
   507                 match = current;
   508             }
   509             continue;
   510         }
   511         if (current->refresh_rate != match->refresh_rate) {
   512             /* Sorted highest refresh to lowest */
   513             if (current->refresh_rate >= target_refresh_rate) {
   514                 match = current;
   515             }
   516         }
   517     }
   518     if (match) {
   519         if (match->format) {
   520             closest->format = match->format;
   521         } else {
   522             closest->format = mode->format;
   523         }
   524         if (match->w && match->h) {
   525             closest->w = match->w;
   526             closest->h = match->h;
   527         } else {
   528             closest->w = mode->w;
   529             closest->h = mode->h;
   530         }
   531         if (match->refresh_rate) {
   532             closest->refresh_rate = match->refresh_rate;
   533         } else {
   534             closest->refresh_rate = mode->refresh_rate;
   535         }
   536         closest->driverdata = match->driverdata;
   537 
   538         /*
   539          * Pick some reasonable defaults if the app and driver don't
   540          * care
   541          */
   542         if (!closest->format) {
   543             closest->format = SDL_PIXELFORMAT_RGB888;
   544         }
   545         if (!closest->w) {
   546             closest->w = 640;
   547         }
   548         if (!closest->h) {
   549             closest->h = 480;
   550         }
   551         return closest;
   552     }
   553     return NULL;
   554 }
   555 
   556 int
   557 SDL_SetDisplayMode(const SDL_DisplayMode * mode)
   558 {
   559     SDL_VideoDisplay *display;
   560     SDL_DisplayMode display_mode;
   561     SDL_DisplayMode current_mode;
   562     int i, ncolors;
   563 
   564     if (!_this) {
   565         SDL_UninitializedVideo();
   566         return -1;
   567     }
   568     display = &SDL_CurrentDisplay;
   569     if (!mode) {
   570         mode = &display->desktop_mode;
   571     }
   572     display_mode = *mode;
   573 
   574     /* Default to the current mode */
   575     if (!display_mode.format) {
   576         display_mode.format = display->current_mode.format;
   577     }
   578     if (!display_mode.w) {
   579         display_mode.w = display->current_mode.w;
   580     }
   581     if (!display_mode.h) {
   582         display_mode.h = display->current_mode.h;
   583     }
   584     if (!display_mode.refresh_rate) {
   585         display_mode.refresh_rate = display->current_mode.refresh_rate;
   586     }
   587     /* Get a good video mode, the closest one possible */
   588     if (!SDL_GetClosestDisplayMode(&display_mode, &display_mode)) {
   589         SDL_SetError("No video mode large enough for %dx%d",
   590                      display_mode.w, display_mode.h);
   591         return -1;
   592     }
   593     /* See if there's anything left to do */
   594     SDL_GetCurrentDisplayMode(&current_mode);
   595     if (SDL_memcmp(&display_mode, &current_mode, sizeof(display_mode)) == 0) {
   596         return 0;
   597     }
   598     /* Actually change the display mode */
   599     if (_this->SetDisplayMode(_this, &display_mode) < 0) {
   600         return -1;
   601     }
   602     display->current_mode = display_mode;
   603 
   604     /* Set up a palette, if necessary */
   605     if (SDL_ISPIXELFORMAT_INDEXED(display_mode.format)) {
   606         ncolors = (1 << SDL_BITSPERPIXEL(display_mode.format));
   607     } else {
   608         ncolors = 0;
   609     }
   610     if ((!ncolors && display->palette) || (ncolors && !display->palette)
   611         || (ncolors && ncolors != display->palette->ncolors)) {
   612         if (display->palette) {
   613             SDL_FreePalette(display->palette);
   614             display->palette = NULL;
   615         }
   616         if (ncolors) {
   617             display->palette = SDL_AllocPalette(ncolors);
   618             if (!display->palette) {
   619                 return -1;
   620             }
   621             SDL_DitherColors(display->palette->colors,
   622                              SDL_BITSPERPIXEL(display_mode.format));
   623         }
   624     }
   625     /* Move any fullscreen windows into position */
   626     for (i = 0; i < display->num_windows; ++i) {
   627         SDL_Window *window = &display->windows[i];
   628         if (FULLSCREEN_VISIBLE(window)) {
   629             SDL_SetWindowPosition(window->id, SDL_WINDOWPOS_CENTERED,
   630                                   SDL_WINDOWPOS_CENTERED);
   631         }
   632     }
   633 
   634     return 0;
   635 }
   636 
   637 int
   638 SDL_SetFullscreenDisplayMode(const SDL_DisplayMode * mode)
   639 {
   640     SDL_VideoDisplay *display;
   641     SDL_DisplayMode fullscreen_mode;
   642     int i;
   643 
   644     if (!_this) {
   645         SDL_UninitializedVideo();
   646         return -1;
   647     }
   648     display = &SDL_CurrentDisplay;
   649     if (!mode) {
   650         mode = &display->desktop_mode;
   651     }
   652     SDL_GetClosestDisplayMode(mode, &fullscreen_mode);
   653     if (SDL_memcmp
   654         (&fullscreen_mode, &display->fullscreen_mode,
   655          sizeof(fullscreen_mode)) == 0) {
   656         /* Nothing to do... */
   657         return 0;
   658     }
   659     display->fullscreen_mode = fullscreen_mode;
   660 
   661     /* Actually set the mode if we have a fullscreen window visible */
   662     for (i = 0; i < display->num_windows; ++i) {
   663         SDL_Window *window = &display->windows[i];
   664         if (FULLSCREEN_VISIBLE(window)) {
   665             if (SDL_SetDisplayMode(&display->fullscreen_mode) < 0) {
   666                 return -1;
   667             }
   668         }
   669         if (window->flags & SDL_WINDOW_FULLSCREEN) {
   670             SDL_OnWindowResized(window);
   671         }
   672     }
   673     return 0;
   674 }
   675 
   676 int
   677 SDL_GetFullscreenDisplayMode(SDL_DisplayMode * mode)
   678 {
   679     if (!_this) {
   680         SDL_UninitializedVideo();
   681         return -1;
   682     }
   683     if (mode) {
   684         *mode = SDL_CurrentDisplay.fullscreen_mode;
   685     }
   686     return 0;
   687 }
   688 
   689 int
   690 SDL_SetDisplayPalette(const SDL_Color * colors, int firstcolor, int ncolors)
   691 {
   692     SDL_Palette *palette;
   693     int status = 0;
   694 
   695     if (!_this) {
   696         SDL_UninitializedVideo();
   697         return -1;
   698     }
   699     palette = SDL_CurrentDisplay.palette;
   700     if (!palette) {
   701         SDL_SetError("Display mode does not have a palette");
   702         return -1;
   703     }
   704     status = SDL_SetPaletteColors(palette, colors, firstcolor, ncolors);
   705 
   706     if (_this->SetDisplayPalette) {
   707         if (_this->SetDisplayPalette(_this, palette) < 0) {
   708             status = -1;
   709         }
   710     }
   711     return status;
   712 }
   713 
   714 int
   715 SDL_GetDisplayPalette(SDL_Color * colors, int firstcolor, int ncolors)
   716 {
   717     SDL_Palette *palette;
   718 
   719     if (!_this) {
   720         SDL_UninitializedVideo();
   721         return -1;
   722     }
   723     palette = SDL_CurrentDisplay.palette;
   724     if (!palette->ncolors) {
   725         SDL_SetError("Display mode does not have a palette");
   726         return -1;
   727     }
   728     if (firstcolor < 0 || (firstcolor + ncolors) > palette->ncolors) {
   729         SDL_SetError("Palette indices are out of range");
   730         return -1;
   731     }
   732     SDL_memcpy(colors, &palette->colors[firstcolor],
   733                ncolors * sizeof(*colors));
   734     return 0;
   735 }
   736 
   737 SDL_WindowID
   738 SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
   739 {
   740     const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
   741                                   SDL_WINDOW_OPENGL |
   742                                   SDL_WINDOW_BORDERLESS |
   743                                   SDL_WINDOW_RESIZABLE);
   744     SDL_VideoDisplay *display;
   745     SDL_Window window;
   746     int num_windows;
   747     SDL_Window *windows;
   748 
   749     if (!_this) {
   750         SDL_UninitializedVideo();
   751         return 0;
   752     }
   753     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   754         SDL_SetError("No OpenGL support in video driver");
   755         return 0;
   756     }
   757     /* Fullscreen windows don't have any window decorations */
   758     if (flags & SDL_WINDOW_FULLSCREEN) {
   759         flags |= SDL_WINDOW_BORDERLESS;
   760         flags &= ~SDL_WINDOW_RESIZABLE;
   761     }
   762     SDL_zero(window);
   763     window.id = _this->next_object_id++;
   764     window.x = x;
   765     window.y = y;
   766     window.w = w;
   767     window.h = h;
   768     window.flags = (flags & allowed_flags);
   769     window.display = _this->current_display;
   770 
   771     if (_this->CreateWindow && _this->CreateWindow(_this, &window) < 0) {
   772         return 0;
   773     }
   774     display = &SDL_CurrentDisplay;
   775     num_windows = display->num_windows;
   776     windows =
   777         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   778     if (!windows) {
   779         if (_this->DestroyWindow) {
   780             _this->DestroyWindow(_this, &window);
   781         }
   782         return 0;
   783     }
   784     windows[num_windows] = window;
   785     display->windows = windows;
   786     display->num_windows++;
   787 
   788     if (title) {
   789         SDL_SetWindowTitle(window.id, title);
   790     }
   791     if (flags & SDL_WINDOW_MAXIMIZED) {
   792         SDL_MaximizeWindow(window.id);
   793     }
   794     if (flags & SDL_WINDOW_MINIMIZED) {
   795         SDL_MinimizeWindow(window.id);
   796     }
   797     if (flags & SDL_WINDOW_SHOWN) {
   798         SDL_ShowWindow(window.id);
   799     }
   800     if (flags & SDL_WINDOW_INPUT_GRABBED) {
   801         SDL_SetWindowGrab(window.id, 1);
   802     }
   803     return window.id;
   804 }
   805 
   806 SDL_WindowID
   807 SDL_CreateWindowFrom(const void *data)
   808 {
   809     SDL_VideoDisplay *display;
   810     SDL_Window window;
   811     int num_windows;
   812     SDL_Window *windows;
   813 
   814     if (!_this) {
   815         SDL_UninitializedVideo();
   816         return (0);
   817     }
   818     SDL_zero(window);
   819     window.id = _this->next_object_id++;
   820     window.display = _this->current_display;
   821 
   822     if (!_this->CreateWindowFrom ||
   823         _this->CreateWindowFrom(_this, &window, data) < 0) {
   824         return 0;
   825     }
   826     display = &SDL_CurrentDisplay;
   827     num_windows = display->num_windows;
   828     windows =
   829         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   830     if (!windows) {
   831         if (_this->DestroyWindow) {
   832             _this->DestroyWindow(_this, &window);
   833         }
   834         if (window.title) {
   835             SDL_free(window.title);
   836         }
   837         return 0;
   838     }
   839     windows[num_windows] = window;
   840     display->windows = windows;
   841     display->num_windows++;
   842 
   843     return window.id;
   844 }
   845 
   846 int
   847 SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
   848 {
   849     char *title = window->title;
   850 
   851     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   852         SDL_SetError("No OpenGL support in video driver");
   853         return -1;
   854     }
   855     if (_this->DestroyWindow) {
   856         _this->DestroyWindow(_this, window);
   857     }
   858     window->title = NULL;
   859     window->flags =
   860         (flags &
   861          ~(SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED | SDL_WINDOW_SHOWN |
   862            SDL_WINDOW_INPUT_GRABBED));
   863 
   864     if (_this->CreateWindow && _this->CreateWindow(_this, window) < 0) {
   865         return -1;
   866     }
   867     if (title) {
   868         SDL_SetWindowTitle(window->id, title);
   869         SDL_free(title);
   870     }
   871     if (flags & SDL_WINDOW_MAXIMIZED) {
   872         SDL_MaximizeWindow(window->id);
   873     }
   874     if (flags & SDL_WINDOW_MINIMIZED) {
   875         SDL_MinimizeWindow(window->id);
   876     }
   877     if (flags & SDL_WINDOW_SHOWN) {
   878         SDL_ShowWindow(window->id);
   879     }
   880     if (flags & SDL_WINDOW_INPUT_GRABBED) {
   881         SDL_SetWindowGrab(window->id, 1);
   882     }
   883     return 0;
   884 }
   885 
   886 SDL_Window *
   887 SDL_GetWindowFromID(SDL_WindowID windowID)
   888 {
   889     int i, j;
   890 
   891     if (!_this) {
   892         SDL_UninitializedVideo();
   893         return NULL;
   894     }
   895     for (i = 0; i < _this->num_displays; ++i) {
   896         SDL_VideoDisplay *display = &_this->displays[i];
   897         for (j = 0; j < display->num_windows; ++j) {
   898             SDL_Window *window = &display->windows[j];
   899             if (window->id == windowID) {
   900                 return window;
   901             }
   902         }
   903     }
   904     return NULL;
   905 }
   906 
   907 SDL_VideoDisplay *
   908 SDL_GetDisplayFromWindow(SDL_Window * window)
   909 {
   910     if (!_this) {
   911         SDL_UninitializedVideo();
   912         return NULL;
   913     }
   914     if (!window) {
   915         return NULL;
   916     }
   917     return &_this->displays[window->display];
   918 }
   919 
   920 Uint32
   921 SDL_GetWindowFlags(SDL_WindowID windowID)
   922 {
   923     SDL_Window *window = SDL_GetWindowFromID(windowID);
   924 
   925     if (!window) {
   926         return 0;
   927     }
   928     return window->flags;
   929 }
   930 
   931 void
   932 SDL_SetWindowTitle(SDL_WindowID windowID, const char *title)
   933 {
   934     SDL_Window *window = SDL_GetWindowFromID(windowID);
   935 
   936     if (!window || title == window->title) {
   937         return;
   938     }
   939     if (window->title) {
   940         SDL_free(window->title);
   941     }
   942     if (title) {
   943         window->title = SDL_strdup(title);
   944     } else {
   945         window->title = NULL;
   946     }
   947 
   948     if (_this->SetWindowTitle) {
   949         _this->SetWindowTitle(_this, window);
   950     }
   951 }
   952 
   953 const char *
   954 SDL_GetWindowTitle(SDL_WindowID windowID)
   955 {
   956     SDL_Window *window = SDL_GetWindowFromID(windowID);
   957 
   958     if (!window) {
   959         return NULL;
   960     }
   961     return window->title;
   962 }
   963 
   964 void
   965 SDL_SetWindowData(SDL_WindowID windowID, void *userdata)
   966 {
   967     SDL_Window *window = SDL_GetWindowFromID(windowID);
   968 
   969     if (!window) {
   970         return;
   971     }
   972     window->userdata = userdata;
   973 }
   974 
   975 void *
   976 SDL_GetWindowData(SDL_WindowID windowID)
   977 {
   978     SDL_Window *window = SDL_GetWindowFromID(windowID);
   979 
   980     if (!window) {
   981         return NULL;
   982     }
   983     return window->userdata;
   984 }
   985 
   986 void
   987 SDL_SetWindowPosition(SDL_WindowID windowID, int x, int y)
   988 {
   989     SDL_Window *window = SDL_GetWindowFromID(windowID);
   990     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
   991 
   992     if (!window) {
   993         return;
   994     }
   995     if (x == SDL_WINDOWPOS_CENTERED) {
   996         window->x = (display->current_mode.w - window->w) / 2;
   997     } else if (x != SDL_WINDOWPOS_UNDEFINED) {
   998         window->x = x;
   999     }
  1000     if (y == SDL_WINDOWPOS_CENTERED) {
  1001         window->y = (display->current_mode.h - window->h) / 2;
  1002     } else if (y != SDL_WINDOWPOS_UNDEFINED) {
  1003         window->y = y;
  1004     }
  1005     if (_this->SetWindowPosition) {
  1006         _this->SetWindowPosition(_this, window);
  1007     }
  1008 }
  1009 
  1010 void
  1011 SDL_GetWindowPosition(SDL_WindowID windowID, int *x, int *y)
  1012 {
  1013     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1014 
  1015     if (!window) {
  1016         return;
  1017     }
  1018     if (x) {
  1019         *x = window->x;
  1020     }
  1021     if (y) {
  1022         *y = window->y;
  1023     }
  1024 }
  1025 
  1026 void
  1027 SDL_SetWindowSize(SDL_WindowID windowID, int w, int h)
  1028 {
  1029     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1030 
  1031     if (!window) {
  1032         return;
  1033     }
  1034     window->w = w;
  1035     window->h = h;
  1036 
  1037     if (_this->SetWindowSize) {
  1038         _this->SetWindowSize(_this, window);
  1039     }
  1040 }
  1041 
  1042 void
  1043 SDL_GetWindowSize(SDL_WindowID windowID, int *w, int *h)
  1044 {
  1045     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1046 
  1047     if (!window) {
  1048         return;
  1049     }
  1050     if (w) {
  1051         *w = window->w;
  1052     }
  1053     if (h) {
  1054         *h = window->h;
  1055     }
  1056 }
  1057 
  1058 void
  1059 SDL_ShowWindow(SDL_WindowID windowID)
  1060 {
  1061     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1062 
  1063     if (!window || (window->flags & SDL_WINDOW_SHOWN)) {
  1064         return;
  1065     }
  1066     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_SHOWN, 0, 0);
  1067 
  1068     if (_this->ShowWindow) {
  1069         _this->ShowWindow(_this, window);
  1070     }
  1071 }
  1072 
  1073 void
  1074 SDL_HideWindow(SDL_WindowID windowID)
  1075 {
  1076     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1077 
  1078     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1079         return;
  1080     }
  1081     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_HIDDEN, 0, 0);
  1082 
  1083     if (_this->HideWindow) {
  1084         _this->HideWindow(_this, window);
  1085     }
  1086 }
  1087 
  1088 void
  1089 SDL_RaiseWindow(SDL_WindowID windowID)
  1090 {
  1091     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1092 
  1093     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1094         return;
  1095     }
  1096     if (_this->RaiseWindow) {
  1097         _this->RaiseWindow(_this, window);
  1098     }
  1099 }
  1100 
  1101 void
  1102 SDL_MaximizeWindow(SDL_WindowID windowID)
  1103 {
  1104     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1105 
  1106     if (!window || (window->flags & SDL_WINDOW_MAXIMIZED)) {
  1107         return;
  1108     }
  1109     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MAXIMIZED, 0, 0);
  1110 
  1111     if (_this->MaximizeWindow) {
  1112         _this->MaximizeWindow(_this, window);
  1113     }
  1114 }
  1115 
  1116 void
  1117 SDL_MinimizeWindow(SDL_WindowID windowID)
  1118 {
  1119     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1120 
  1121     if (!window || (window->flags & SDL_WINDOW_MINIMIZED)) {
  1122         return;
  1123     }
  1124     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MINIMIZED, 0, 0);
  1125 
  1126     if (_this->MinimizeWindow) {
  1127         _this->MinimizeWindow(_this, window);
  1128     }
  1129 }
  1130 
  1131 void
  1132 SDL_RestoreWindow(SDL_WindowID windowID)
  1133 {
  1134     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1135 
  1136     if (!window
  1137         || (window->flags & (SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED))) {
  1138         return;
  1139     }
  1140     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_RESTORED, 0, 0);
  1141 
  1142     if (_this->RestoreWindow) {
  1143         _this->RestoreWindow(_this, window);
  1144     }
  1145 }
  1146 
  1147 int
  1148 SDL_SetWindowFullscreen(SDL_WindowID windowID, int fullscreen)
  1149 {
  1150     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1151 
  1152     if (!window) {
  1153         return -1;
  1154     }
  1155     if (fullscreen) {
  1156         fullscreen = SDL_WINDOW_FULLSCREEN;
  1157     }
  1158     if ((window->flags & SDL_WINDOW_FULLSCREEN) == fullscreen) {
  1159         return 0;
  1160     }
  1161     if (fullscreen) {
  1162         window->flags |= SDL_WINDOW_FULLSCREEN;
  1163 
  1164         if (FULLSCREEN_VISIBLE(window)) {
  1165             SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1166 
  1167             /* Hide any other fullscreen windows */
  1168             int i;
  1169             for (i = 0; i < display->num_windows; ++i) {
  1170                 SDL_Window *other = &display->windows[i];
  1171                 if (other->id != windowID && FULLSCREEN_VISIBLE(other)) {
  1172                     SDL_MinimizeWindow(other->id);
  1173                 }
  1174             }
  1175 
  1176             SDL_SetDisplayMode(&display->fullscreen_mode);
  1177         }
  1178     } else {
  1179         window->flags &= ~SDL_WINDOW_FULLSCREEN;
  1180 
  1181         if (FULLSCREEN_VISIBLE(window)) {
  1182             SDL_SetDisplayMode(NULL);
  1183         }
  1184     }
  1185     return 0;
  1186 }
  1187 
  1188 void
  1189 SDL_SetWindowGrab(SDL_WindowID windowID, int mode)
  1190 {
  1191     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1192 
  1193     if (!window || (!!mode == !!(window->flags & SDL_WINDOW_INPUT_GRABBED))) {
  1194         return;
  1195     }
  1196     if (mode) {
  1197         window->flags |= SDL_WINDOW_INPUT_GRABBED;
  1198     } else {
  1199         window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
  1200     }
  1201 
  1202     if ((window->flags & SDL_WINDOW_INPUT_FOCUS) && _this->SetWindowGrab) {
  1203         _this->SetWindowGrab(_this, window);
  1204     }
  1205 }
  1206 
  1207 int
  1208 SDL_GetWindowGrab(SDL_WindowID windowID)
  1209 {
  1210     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1211 
  1212     if (!window) {
  1213         return 0;
  1214     }
  1215     return ((window->flags & SDL_WINDOW_INPUT_GRABBED) != 0);
  1216 }
  1217 
  1218 void
  1219 SDL_OnWindowShown(SDL_Window * window)
  1220 {
  1221 }
  1222 
  1223 void
  1224 SDL_OnWindowHidden(SDL_Window * window)
  1225 {
  1226 }
  1227 
  1228 void
  1229 SDL_OnWindowResized(SDL_Window * window)
  1230 {
  1231     SDL_Renderer *renderer = window->renderer;
  1232 
  1233     if (renderer && renderer->DisplayModeChanged) {
  1234         renderer->DisplayModeChanged(renderer);
  1235     }
  1236 }
  1237 
  1238 void
  1239 SDL_OnWindowFocusGained(SDL_Window * window)
  1240 {
  1241     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1242 
  1243     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1244         SDL_SetDisplayMode(&display->fullscreen_mode);
  1245     }
  1246     if (display->gamma && _this->SetDisplayGammaRamp) {
  1247         _this->SetDisplayGammaRamp(_this, display->gamma);
  1248     }
  1249     if ((window->flags & SDL_WINDOW_INPUT_GRABBED) && _this->SetWindowGrab) {
  1250         _this->SetWindowGrab(_this, window);
  1251     }
  1252 }
  1253 
  1254 void
  1255 SDL_OnWindowFocusLost(SDL_Window * window)
  1256 {
  1257     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1258 
  1259     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1260         SDL_MinimizeWindow(window->id);
  1261         SDL_SetDisplayMode(NULL);
  1262     }
  1263     if (display->gamma && _this->SetDisplayGammaRamp) {
  1264         _this->SetDisplayGammaRamp(_this, display->saved_gamma);
  1265     }
  1266     if ((window->flags & SDL_WINDOW_INPUT_GRABBED) && _this->SetWindowGrab) {
  1267         _this->SetWindowGrab(_this, window);
  1268     }
  1269 }
  1270 
  1271 SDL_WindowID
  1272 SDL_GetFocusWindow(void)
  1273 {
  1274     SDL_VideoDisplay *display;
  1275     int i;
  1276 
  1277     if (!_this) {
  1278         return 0;
  1279     }
  1280     display = &SDL_CurrentDisplay;
  1281     for (i = 0; i < display->num_windows; ++i) {
  1282         SDL_Window *window = &display->windows[i];
  1283 
  1284         if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
  1285             return window->id;
  1286         }
  1287     }
  1288     return 0;
  1289 }
  1290 
  1291 void
  1292 SDL_DestroyWindow(SDL_WindowID windowID)
  1293 {
  1294     int i, j;
  1295 
  1296     if (!_this) {
  1297         return;
  1298     }
  1299     /* Restore video mode, etc. */
  1300     SDL_SendWindowEvent(windowID, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
  1301 
  1302     for (i = 0; i < _this->num_displays; ++i) {
  1303         SDL_VideoDisplay *display = &_this->displays[i];
  1304         for (j = 0; j < display->num_windows; ++j) {
  1305             SDL_Window *window = &display->windows[j];
  1306             if (window->id != windowID) {
  1307                 continue;
  1308             }
  1309             if (window->title) {
  1310                 SDL_free(window->title);
  1311                 window->title = NULL;
  1312             }
  1313             if (window->renderer) {
  1314                 SDL_DestroyRenderer(window->id);
  1315                 window->renderer = NULL;
  1316             }
  1317             if (_this->DestroyWindow) {
  1318                 _this->DestroyWindow(_this, window);
  1319             }
  1320             if (j != display->num_windows - 1) {
  1321                 SDL_memcpy(&display->windows[i],
  1322                            &display->windows[i + 1],
  1323                            (display->num_windows - i - 1) * sizeof(*window));
  1324             }
  1325             --display->num_windows;
  1326             return;
  1327         }
  1328     }
  1329 }
  1330 
  1331 void
  1332 SDL_AddRenderDriver(int displayIndex, const SDL_RenderDriver * driver)
  1333 {
  1334     SDL_VideoDisplay *display;
  1335     SDL_RenderDriver *render_drivers;
  1336 
  1337     if (displayIndex >= _this->num_displays) {
  1338         return;
  1339     }
  1340     display = &_this->displays[displayIndex];
  1341 
  1342     render_drivers =
  1343         SDL_realloc(display->render_drivers,
  1344                     (display->num_render_drivers +
  1345                      1) * sizeof(*render_drivers));
  1346     if (render_drivers) {
  1347         render_drivers[display->num_render_drivers] = *driver;
  1348         display->render_drivers = render_drivers;
  1349         display->num_render_drivers++;
  1350     }
  1351 }
  1352 
  1353 int
  1354 SDL_GetNumRenderDrivers(void)
  1355 {
  1356     if (_this) {
  1357         return SDL_CurrentDisplay.num_render_drivers;
  1358     }
  1359     return 0;
  1360 }
  1361 
  1362 int
  1363 SDL_GetRenderDriverInfo(int index, SDL_RendererInfo * info)
  1364 {
  1365     if (!_this) {
  1366         SDL_UninitializedVideo();
  1367         return -1;
  1368     }
  1369     if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
  1370         SDL_SetError("index must be in the range of 0 - %d",
  1371                      SDL_GetNumRenderDrivers() - 1);
  1372         return -1;
  1373     }
  1374     *info = SDL_CurrentDisplay.render_drivers[index].info;
  1375     return 0;
  1376 }
  1377 
  1378 int
  1379 SDL_CreateRenderer(SDL_WindowID windowID, int index, Uint32 flags)
  1380 {
  1381     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1382 
  1383     if (!window) {
  1384         return 0;
  1385     }
  1386     if (index < 0) {
  1387         const char *override = SDL_getenv("SDL_VIDEO_RENDERER");
  1388         int n = SDL_GetNumRenderDrivers();
  1389         for (index = 0; index < n; ++index) {
  1390             SDL_RenderDriver *driver =
  1391                 &SDL_CurrentDisplay.render_drivers[index];
  1392 
  1393             if (override) {
  1394                 if (SDL_strcasecmp(override, driver->info.name) == 0) {
  1395                     break;
  1396                 }
  1397             } else {
  1398                 if ((driver->info.flags & flags) == flags) {
  1399                     break;
  1400                 }
  1401             }
  1402         }
  1403         if (index == n) {
  1404             SDL_SetError("Couldn't find matching render driver");
  1405             return -1;
  1406         }
  1407     }
  1408     if (index >= SDL_GetNumRenderDrivers()) {
  1409         SDL_SetError("index must be -1 or in the range of 0 - %d",
  1410                      SDL_GetNumRenderDrivers() - 1);
  1411         return -1;
  1412     }
  1413     /* Free any existing renderer */
  1414     SDL_DestroyRenderer(windowID);
  1415 
  1416     /* Create a new renderer instance */
  1417     window->renderer = SDL_CurrentDisplay.render_drivers[index]
  1418         .CreateRenderer(window, flags);
  1419     SDL_SelectRenderer(window->id);
  1420 
  1421     return 0;
  1422 }
  1423 
  1424 int
  1425 SDL_SelectRenderer(SDL_WindowID windowID)
  1426 {
  1427     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1428     SDL_Renderer *renderer;
  1429 
  1430     if (!window || !window->renderer) {
  1431         return -1;
  1432     }
  1433     renderer = window->renderer;
  1434     if (renderer && renderer->ActivateRenderer) {
  1435         if (renderer->ActivateRenderer(renderer) < 0) {
  1436             return -1;
  1437         }
  1438     }
  1439     SDL_CurrentDisplay.current_renderer = renderer;
  1440     return 0;
  1441 }
  1442 
  1443 int
  1444 SDL_GetRendererInfo(SDL_RendererInfo * info)
  1445 {
  1446     if (!_this) {
  1447         SDL_UninitializedVideo();
  1448         return -1;
  1449     }
  1450     if (!SDL_CurrentDisplay.current_renderer) {
  1451         SDL_SetError("There is no current renderer");
  1452         return -1;
  1453     }
  1454     *info = SDL_CurrentDisplay.current_renderer->info;
  1455     return 0;
  1456 }
  1457 
  1458 SDL_TextureID
  1459 SDL_CreateTexture(Uint32 format, int access, int w, int h)
  1460 {
  1461     int hash;
  1462     SDL_Renderer *renderer;
  1463     SDL_Texture *texture;
  1464 
  1465     if (!_this) {
  1466         SDL_UninitializedVideo();
  1467         return 0;
  1468     }
  1469     renderer = SDL_CurrentDisplay.current_renderer;
  1470     if (!renderer || !renderer->CreateTexture) {
  1471         return 0;
  1472     }
  1473     texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
  1474     if (!texture) {
  1475         SDL_OutOfMemory();
  1476         return 0;
  1477     }
  1478     texture->id = _this->next_object_id++;
  1479     texture->format = format;
  1480     texture->access = access;
  1481     texture->w = w;
  1482     texture->h = h;
  1483     texture->r = 255;
  1484     texture->g = 255;
  1485     texture->b = 255;
  1486     texture->a = 255;
  1487     texture->renderer = renderer;
  1488 
  1489     if (renderer->CreateTexture(renderer, texture) < 0) {
  1490         if (renderer->DestroyTexture) {
  1491             renderer->DestroyTexture(renderer, texture);
  1492         }
  1493         SDL_free(texture);
  1494         return 0;
  1495     }
  1496     hash = (texture->id % SDL_arraysize(SDL_CurrentDisplay.textures));
  1497     texture->next = SDL_CurrentDisplay.textures[hash];
  1498     SDL_CurrentDisplay.textures[hash] = texture;
  1499 
  1500     return texture->id;
  1501 }
  1502 
  1503 SDL_TextureID
  1504 SDL_CreateTextureFromSurface(Uint32 format, SDL_Surface * surface)
  1505 {
  1506     SDL_TextureID textureID;
  1507     SDL_PixelFormat *fmt;
  1508     int bpp;
  1509     Uint32 Rmask, Gmask, Bmask, Amask;
  1510 
  1511     if (!surface) {
  1512         SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
  1513         return 0;
  1514     }
  1515     fmt = surface->format;
  1516 
  1517     if (format) {
  1518         if (!SDL_PixelFormatEnumToMasks
  1519             (format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
  1520             SDL_SetError("Unknown pixel format");
  1521             return 0;
  1522         }
  1523     } else {
  1524         if (surface->format->Amask
  1525             || !(surface->map->info.flags &
  1526                  (SDL_COPY_COLORKEY | SDL_COPY_MASK | SDL_COPY_BLEND))) {
  1527             bpp = fmt->BitsPerPixel;
  1528             Rmask = fmt->Rmask;
  1529             Gmask = fmt->Gmask;
  1530             Bmask = fmt->Bmask;
  1531             Amask = fmt->Amask;
  1532         } else {
  1533             /* Need a format with alpha */
  1534             bpp = 32;
  1535             Rmask = 0x00FF0000;
  1536             Gmask = 0x0000FF00;
  1537             Bmask = 0x000000FF;
  1538             Amask = 0xFF000000;
  1539         }
  1540         format = SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
  1541         if (!format) {
  1542             SDL_SetError("Unknown pixel format");
  1543             return 0;
  1544         }
  1545     }
  1546 
  1547     textureID =
  1548         SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1549                           surface->h);
  1550     if (!textureID) {
  1551         return 0;
  1552     }
  1553     if (bpp == fmt->BitsPerPixel && Rmask == fmt->Rmask && Gmask == fmt->Gmask
  1554         && Bmask == fmt->Bmask && Amask == fmt->Amask) {
  1555         if (SDL_MUSTLOCK(surface)) {
  1556             if (SDL_LockSurface(surface) < 0) {
  1557                 SDL_DestroyTexture(textureID);
  1558                 return 0;
  1559             }
  1560             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1561                               surface->pitch);
  1562             SDL_UnlockSurface(surface);
  1563         } else {
  1564             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1565                               surface->pitch);
  1566         }
  1567     } else {
  1568         SDL_PixelFormat *dst_fmt;
  1569         SDL_Surface *dst = NULL;
  1570 
  1571         /* Set up a destination surface for the texture update */
  1572         dst_fmt = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
  1573         if (dst_fmt) {
  1574             if (SDL_ISPIXELFORMAT_INDEXED(format)) {
  1575                 dst_fmt->palette =
  1576                     SDL_AllocPalette((1 << SDL_BITSPERPIXEL(format)));
  1577                 if (dst_fmt->palette) {
  1578                     /*
  1579                      * FIXME: Should we try to copy
  1580                      * fmt->palette?
  1581                      */
  1582                     SDL_DitherColors(dst_fmt->palette->colors,
  1583                                      SDL_BITSPERPIXEL(format));
  1584                 }
  1585             }
  1586             dst = SDL_ConvertSurface(surface, dst_fmt, 0);
  1587             if (dst) {
  1588                 SDL_UpdateTexture(textureID, NULL, dst->pixels, dst->pitch);
  1589                 SDL_FreeSurface(dst);
  1590             }
  1591             if (dst_fmt->palette) {
  1592                 SDL_FreePalette(dst_fmt->palette);
  1593             }
  1594             SDL_FreeFormat(dst_fmt);
  1595         }
  1596         if (!dst) {
  1597             SDL_DestroyTexture(textureID);
  1598             return 0;
  1599         }
  1600     }
  1601 
  1602     if (SDL_ISPIXELFORMAT_INDEXED(format) && fmt->palette) {
  1603         SDL_SetTexturePalette(textureID, fmt->palette->colors, 0,
  1604                               fmt->palette->ncolors);
  1605     }
  1606     return textureID;
  1607 }
  1608 
  1609 static __inline__ SDL_Texture *
  1610 SDL_GetTextureFromID(SDL_TextureID textureID)
  1611 {
  1612     int hash;
  1613     SDL_Texture *texture;
  1614 
  1615     if (!_this) {
  1616         return NULL;
  1617     }
  1618     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  1619     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  1620          texture = texture->next) {
  1621         if (texture->id == textureID) {
  1622             return texture;
  1623         }
  1624     }
  1625     return NULL;
  1626 }
  1627 
  1628 int
  1629 SDL_QueryTexture(SDL_TextureID textureID, Uint32 * format, int *access,
  1630                  int *w, int *h)
  1631 {
  1632     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1633 
  1634     if (!texture) {
  1635         return -1;
  1636     }
  1637     if (format) {
  1638         *format = texture->format;
  1639     }
  1640     if (access) {
  1641         *access = texture->access;
  1642     }
  1643     if (w) {
  1644         *w = texture->w;
  1645     }
  1646     if (h) {
  1647         *h = texture->h;
  1648     }
  1649     return 0;
  1650 }
  1651 
  1652 int
  1653 SDL_QueryTexturePixels(SDL_TextureID textureID, void **pixels, int *pitch)
  1654 {
  1655     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1656     SDL_Renderer *renderer;
  1657 
  1658     if (!texture) {
  1659         return -1;
  1660     }
  1661     renderer = texture->renderer;
  1662     if (!renderer->QueryTexturePixels) {
  1663         return -1;
  1664     }
  1665     return renderer->QueryTexturePixels(renderer, texture, pixels, pitch);
  1666 }
  1667 
  1668 int
  1669 SDL_SetTexturePalette(SDL_TextureID textureID, const SDL_Color * colors,
  1670                       int firstcolor, int ncolors)
  1671 {
  1672     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1673     SDL_Renderer *renderer;
  1674 
  1675     if (!texture) {
  1676         return -1;
  1677     }
  1678     renderer = texture->renderer;
  1679     if (!renderer->SetTexturePalette) {
  1680         return -1;
  1681     }
  1682     return renderer->SetTexturePalette(renderer, texture, colors, firstcolor,
  1683                                        ncolors);
  1684 }
  1685 
  1686 int
  1687 SDL_GetTexturePalette(SDL_TextureID textureID, SDL_Color * colors,
  1688                       int firstcolor, int ncolors)
  1689 {
  1690     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1691     SDL_Renderer *renderer;
  1692 
  1693     if (!texture) {
  1694         return -1;
  1695     }
  1696     renderer = texture->renderer;
  1697     if (!renderer->GetTexturePalette) {
  1698         return -1;
  1699     }
  1700     return renderer->GetTexturePalette(renderer, texture, colors, firstcolor,
  1701                                        ncolors);
  1702 }
  1703 
  1704 int
  1705 SDL_SetTextureColorMod(SDL_TextureID textureID, Uint8 r, Uint8 g, Uint8 b)
  1706 {
  1707     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1708     SDL_Renderer *renderer;
  1709 
  1710     if (!texture) {
  1711         return -1;
  1712     }
  1713     renderer = texture->renderer;
  1714     if (!renderer->SetTextureColorMod) {
  1715         return -1;
  1716     }
  1717     if (r < 255 || g < 255 || b < 255) {
  1718         texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
  1719     } else {
  1720         texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
  1721     }
  1722     texture->r = r;
  1723     texture->g = g;
  1724     texture->b = b;
  1725     return renderer->SetTextureColorMod(renderer, texture);
  1726 }
  1727 
  1728 int
  1729 SDL_GetTextureColorMod(SDL_TextureID textureID, Uint8 * r, Uint8 * g,
  1730                        Uint8 * b)
  1731 {
  1732     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1733     SDL_Renderer *renderer;
  1734 
  1735     if (!texture) {
  1736         return -1;
  1737     }
  1738     renderer = texture->renderer;
  1739     if (r) {
  1740         *r = texture->r;
  1741     }
  1742     if (g) {
  1743         *g = texture->g;
  1744     }
  1745     if (b) {
  1746         *b = texture->b;
  1747     }
  1748     return 0;
  1749 }
  1750 
  1751 int
  1752 SDL_SetTextureAlphaMod(SDL_TextureID textureID, Uint8 alpha)
  1753 {
  1754     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1755     SDL_Renderer *renderer;
  1756 
  1757     if (!texture) {
  1758         return -1;
  1759     }
  1760     renderer = texture->renderer;
  1761     if (!renderer->SetTextureAlphaMod) {
  1762         return -1;
  1763     }
  1764     if (alpha < 255) {
  1765         texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
  1766     } else {
  1767         texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
  1768     }
  1769     texture->a = alpha;
  1770     return renderer->SetTextureAlphaMod(renderer, texture);
  1771 }
  1772 
  1773 int
  1774 SDL_GetTextureAlphaMod(SDL_TextureID textureID, Uint8 * alpha)
  1775 {
  1776     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1777 
  1778     if (!texture) {
  1779         return -1;
  1780     }
  1781     if (alpha) {
  1782         *alpha = texture->a;
  1783     }
  1784     return 0;
  1785 }
  1786 
  1787 int
  1788 SDL_SetTextureBlendMode(SDL_TextureID textureID, int blendMode)
  1789 {
  1790     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1791     SDL_Renderer *renderer;
  1792 
  1793     if (!texture) {
  1794         return -1;
  1795     }
  1796     renderer = texture->renderer;
  1797     if (!renderer->SetTextureBlendMode) {
  1798         return -1;
  1799     }
  1800     texture->blendMode = blendMode;
  1801     return renderer->SetTextureBlendMode(renderer, texture);
  1802 }
  1803 
  1804 int
  1805 SDL_GetTextureBlendMode(SDL_TextureID textureID, int *blendMode)
  1806 {
  1807     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1808 
  1809     if (!texture) {
  1810         return -1;
  1811     }
  1812     if (blendMode) {
  1813         *blendMode = texture->blendMode;
  1814     }
  1815     return 0;
  1816 }
  1817 
  1818 int
  1819 SDL_SetTextureScaleMode(SDL_TextureID textureID, int scaleMode)
  1820 {
  1821     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1822     SDL_Renderer *renderer;
  1823 
  1824     if (!texture) {
  1825         return -1;
  1826     }
  1827     renderer = texture->renderer;
  1828     if (!renderer->SetTextureScaleMode) {
  1829         return -1;
  1830     }
  1831     texture->scaleMode = scaleMode;
  1832     return renderer->SetTextureScaleMode(renderer, texture);
  1833 }
  1834 
  1835 int
  1836 SDL_GetTextureScaleMode(SDL_TextureID textureID, int *scaleMode)
  1837 {
  1838     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1839 
  1840     if (!texture) {
  1841         return -1;
  1842     }
  1843     if (scaleMode) {
  1844         *scaleMode = texture->scaleMode;
  1845     }
  1846     return 0;
  1847 }
  1848 
  1849 int
  1850 SDL_UpdateTexture(SDL_TextureID textureID, const SDL_Rect * rect,
  1851                   const void *pixels, int pitch)
  1852 {
  1853     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1854     SDL_Renderer *renderer;
  1855     SDL_Rect full_rect;
  1856 
  1857     if (!texture) {
  1858         return -1;
  1859     }
  1860     renderer = texture->renderer;
  1861     if (!renderer->UpdateTexture) {
  1862         return -1;
  1863     }
  1864     if (!rect) {
  1865         full_rect.x = 0;
  1866         full_rect.y = 0;
  1867         full_rect.w = texture->w;
  1868         full_rect.h = texture->h;
  1869         rect = &full_rect;
  1870     }
  1871     return renderer->UpdateTexture(renderer, texture, rect, pixels, pitch);
  1872 }
  1873 
  1874 int
  1875 SDL_LockTexture(SDL_TextureID textureID, const SDL_Rect * rect, int markDirty,
  1876                 void **pixels, int *pitch)
  1877 {
  1878     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1879     SDL_Renderer *renderer;
  1880     SDL_Rect full_rect;
  1881 
  1882     if (!texture) {
  1883         return -1;
  1884     }
  1885     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1886         SDL_SetError("SDL_LockTexture(): texture must be streaming");
  1887         return -1;
  1888     }
  1889     renderer = texture->renderer;
  1890     if (!renderer->LockTexture) {
  1891         return -1;
  1892     }
  1893     if (!rect) {
  1894         full_rect.x = 0;
  1895         full_rect.y = 0;
  1896         full_rect.w = texture->w;
  1897         full_rect.h = texture->h;
  1898         rect = &full_rect;
  1899     }
  1900     return renderer->LockTexture(renderer, texture, rect, markDirty, pixels,
  1901                                  pitch);
  1902 }
  1903 
  1904 void
  1905 SDL_UnlockTexture(SDL_TextureID textureID)
  1906 {
  1907     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1908     SDL_Renderer *renderer;
  1909 
  1910     if (!texture) {
  1911         return;
  1912     }
  1913     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1914         return;
  1915     }
  1916     renderer = texture->renderer;
  1917     if (!renderer->UnlockTexture) {
  1918         return;
  1919     }
  1920     renderer->UnlockTexture(renderer, texture);
  1921 }
  1922 
  1923 void
  1924 SDL_DirtyTexture(SDL_TextureID textureID, int numrects,
  1925                  const SDL_Rect * rects)
  1926 {
  1927     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1928     SDL_Renderer *renderer;
  1929 
  1930     if (!texture) {
  1931         return;
  1932     }
  1933     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1934         return;
  1935     }
  1936     renderer = texture->renderer;
  1937     if (!renderer->DirtyTexture) {
  1938         return;
  1939     }
  1940     renderer->DirtyTexture(renderer, texture, numrects, rects);
  1941 }
  1942 
  1943 int
  1944 SDL_RenderFill(Uint8 r, Uint8 g, Uint8 b, Uint8 a, const SDL_Rect * rect)
  1945 {
  1946     SDL_Renderer *renderer;
  1947     SDL_Window *window;
  1948     SDL_Rect real_rect;
  1949 
  1950     if (!_this) {
  1951         SDL_UninitializedVideo();
  1952         return -1;
  1953     }
  1954     renderer = SDL_CurrentDisplay.current_renderer;
  1955     if (!renderer || !renderer->RenderFill) {
  1956         return -1;
  1957     }
  1958     window = SDL_GetWindowFromID(renderer->window);
  1959     real_rect.x = 0;
  1960     real_rect.y = 0;
  1961     real_rect.w = window->w;
  1962     real_rect.h = window->h;
  1963     if (rect) {
  1964         if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
  1965             return 0;
  1966         }
  1967     }
  1968     return renderer->RenderFill(renderer, r, g, b, a, &real_rect);
  1969 }
  1970 
  1971 int
  1972 SDL_RenderCopy(SDL_TextureID textureID, const SDL_Rect * srcrect,
  1973                const SDL_Rect * dstrect)
  1974 {
  1975     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1976     SDL_Renderer *renderer;
  1977     SDL_Window *window;
  1978     SDL_Rect real_srcrect;
  1979     SDL_Rect real_dstrect;
  1980 
  1981     if (!texture || texture->renderer != SDL_CurrentDisplay.current_renderer) {
  1982         return -1;
  1983     }
  1984     renderer = SDL_CurrentDisplay.current_renderer;
  1985     if (!renderer || !renderer->RenderCopy) {
  1986         return -1;
  1987     }
  1988     window = SDL_GetWindowFromID(renderer->window);
  1989     if (srcrect) {
  1990         real_srcrect = *srcrect;
  1991     } else {
  1992         real_srcrect.x = 0;
  1993         real_srcrect.y = 0;
  1994         real_srcrect.w = texture->w;
  1995         real_srcrect.h = texture->h;
  1996     }
  1997     if (dstrect) {
  1998         real_dstrect = *dstrect;
  1999     } else {
  2000         real_dstrect.x = 0;
  2001         real_dstrect.y = 0;
  2002         real_dstrect.w = window->w;
  2003         real_dstrect.h = window->h;
  2004     }
  2005 
  2006     return renderer->RenderCopy(renderer, texture, &real_srcrect,
  2007                                 &real_dstrect);
  2008 }
  2009 
  2010 void
  2011 SDL_RenderPresent(void)
  2012 {
  2013     SDL_Renderer *renderer;
  2014 
  2015     if (!_this) {
  2016         SDL_UninitializedVideo();
  2017         return;
  2018     }
  2019     renderer = SDL_CurrentDisplay.current_renderer;
  2020     if (!renderer || !renderer->RenderPresent) {
  2021         return;
  2022     }
  2023     renderer->RenderPresent(renderer);
  2024 }
  2025 
  2026 void
  2027 SDL_DestroyTexture(SDL_TextureID textureID)
  2028 {
  2029     int hash;
  2030     SDL_Texture *prev, *texture;
  2031     SDL_Renderer *renderer;
  2032 
  2033     if (!_this) {
  2034         SDL_UninitializedVideo();
  2035         return;
  2036     }
  2037     /* Look up the texture in the hash table */
  2038     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  2039     prev = NULL;
  2040     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  2041          prev = texture, texture = texture->next) {
  2042         if (texture->id == textureID) {
  2043             break;
  2044         }
  2045     }
  2046     if (!texture) {
  2047         return;
  2048     }
  2049     /* Unlink the texture from the list */
  2050     if (prev) {
  2051         prev->next = texture->next;
  2052     } else {
  2053         SDL_CurrentDisplay.textures[hash] = texture->next;
  2054     }
  2055 
  2056     /* Free the texture */
  2057     renderer = texture->renderer;
  2058     renderer->DestroyTexture(renderer, texture);
  2059     SDL_free(texture);
  2060 }
  2061 
  2062 void
  2063 SDL_DestroyRenderer(SDL_WindowID windowID)
  2064 {
  2065     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2066     SDL_Renderer *renderer;
  2067     int i;
  2068 
  2069     if (!window) {
  2070         return;
  2071     }
  2072     renderer = window->renderer;
  2073     if (!renderer) {
  2074         return;
  2075     }
  2076     /* Free existing textures for this renderer */
  2077     for (i = 0; i < SDL_arraysize(SDL_CurrentDisplay.textures); ++i) {
  2078         SDL_Texture *texture;
  2079         SDL_Texture *prev = NULL;
  2080         SDL_Texture *next;
  2081         for (texture = SDL_CurrentDisplay.textures[i]; texture;
  2082              texture = next) {
  2083             next = texture->next;
  2084             if (texture->renderer == renderer) {
  2085                 if (prev) {
  2086                     prev->next = next;
  2087                 } else {
  2088                     SDL_CurrentDisplay.textures[i] = next;
  2089                 }
  2090                 renderer->DestroyTexture(renderer, texture);
  2091                 SDL_free(texture);
  2092             } else {
  2093                 prev = texture;
  2094             }
  2095         }
  2096     }
  2097 
  2098     /* Free the renderer instance */
  2099     renderer->DestroyRenderer(renderer);
  2100 
  2101     /* Clear references */
  2102     window->renderer = NULL;
  2103     if (SDL_CurrentDisplay.current_renderer == renderer) {
  2104         SDL_CurrentDisplay.current_renderer = NULL;
  2105     }
  2106 }
  2107 
  2108 void
  2109 SDL_VideoQuit(void)
  2110 {
  2111     int i, j;
  2112 
  2113     if (!_this) {
  2114         return;
  2115     }
  2116     /* Halt event processing before doing anything else */
  2117     SDL_StopEventLoop();
  2118 
  2119     /* Clean up the system video */
  2120     for (i = _this->num_displays; i--;) {
  2121         SDL_VideoDisplay *display = &_this->displays[i];
  2122         for (j = display->num_windows; j--;) {
  2123             SDL_DestroyWindow(display->windows[i].id);
  2124         }
  2125         if (display->windows) {
  2126             SDL_free(display->windows);
  2127             display->windows = NULL;
  2128         }
  2129         display->num_windows = 0;
  2130         if (display->render_drivers) {
  2131             SDL_free(display->render_drivers);
  2132             display->render_drivers = NULL;
  2133         }
  2134         display->num_render_drivers = 0;
  2135     }
  2136     _this->VideoQuit(_this);
  2137 
  2138     for (i = _this->num_displays; i--;) {
  2139         SDL_VideoDisplay *display = &_this->displays[i];
  2140         for (j = display->num_display_modes; j--;) {
  2141             if (display->display_modes[j].driverdata) {
  2142                 SDL_free(display->display_modes[j].driverdata);
  2143                 display->display_modes[j].driverdata = NULL;
  2144             }
  2145         }
  2146         if (display->display_modes) {
  2147             SDL_free(display->display_modes);
  2148             display->display_modes = NULL;
  2149         }
  2150         if (display->desktop_mode.driverdata) {
  2151             SDL_free(display->desktop_mode.driverdata);
  2152             display->desktop_mode.driverdata = NULL;
  2153         }
  2154         if (display->palette) {
  2155             SDL_FreePalette(display->palette);
  2156             display->palette = NULL;
  2157         }
  2158         if (display->gamma) {
  2159             SDL_free(display->gamma);
  2160             display->gamma = NULL;
  2161         }
  2162         if (display->driverdata) {
  2163             SDL_free(display->driverdata);
  2164             display->driverdata = NULL;
  2165         }
  2166     }
  2167     if (_this->displays) {
  2168         SDL_free(_this->displays);
  2169         _this->displays = NULL;
  2170     }
  2171     _this->free(_this);
  2172     _this = NULL;
  2173 }
  2174 
  2175 int
  2176 SDL_GL_LoadLibrary(const char *path)
  2177 {
  2178     int retval;
  2179 
  2180     if (!_this) {
  2181         SDL_UninitializedVideo();
  2182         return -1;
  2183     }
  2184     if (_this->GL_LoadLibrary) {
  2185         retval = _this->GL_LoadLibrary(_this, path);
  2186     } else {
  2187         SDL_SetError("No dynamic GL support in video driver");
  2188         retval = -1;
  2189     }
  2190     return (retval);
  2191 }
  2192 
  2193 void *
  2194 SDL_GL_GetProcAddress(const char *proc)
  2195 {
  2196     void *func;
  2197 
  2198     if (!_this) {
  2199         SDL_UninitializedVideo();
  2200         return NULL;
  2201     }
  2202     func = NULL;
  2203     if (_this->GL_GetProcAddress) {
  2204         if (_this->gl_config.driver_loaded) {
  2205             func = _this->GL_GetProcAddress(_this, proc);
  2206         } else {
  2207             SDL_SetError("No GL driver has been loaded");
  2208         }
  2209     } else {
  2210         SDL_SetError("No dynamic GL support in video driver");
  2211     }
  2212     return func;
  2213 }
  2214 
  2215 SDL_bool
  2216 SDL_GL_ExtensionSupported(const char *extension)
  2217 {
  2218 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2219     const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
  2220     const char *extensions;
  2221     const char *start;
  2222     const char *where, *terminator;
  2223 
  2224     /* Extension names should not have spaces. */
  2225     where = SDL_strchr(extension, ' ');
  2226     if (where || *extension == '\0') {
  2227         return SDL_FALSE;
  2228     }
  2229     /* See if there's an environment variable override */
  2230     start = SDL_getenv(extension);
  2231     if (start && *start == '0') {
  2232         return SDL_FALSE;
  2233     }
  2234     /* Lookup the available extensions */
  2235     glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
  2236     if (glGetStringFunc) {
  2237         extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
  2238     } else {
  2239         extensions = NULL;
  2240     }
  2241     if (!extensions) {
  2242         return SDL_FALSE;
  2243     }
  2244     /*
  2245      * It takes a bit of care to be fool-proof about parsing the OpenGL
  2246      * extensions string. Don't be fooled by sub-strings, etc.
  2247      */
  2248 
  2249     start = extensions;
  2250 
  2251     for (;;) {
  2252         where = SDL_strstr(start, extension);
  2253         if (!where)
  2254             break;
  2255 
  2256         terminator = where + SDL_strlen(extension);
  2257         if (where == start || *(where - 1) == ' ')
  2258             if (*terminator == ' ' || *terminator == '\0')
  2259                 return SDL_TRUE;
  2260 
  2261         start = terminator;
  2262     }
  2263     return SDL_FALSE;
  2264 #else
  2265     return SDL_FALSE;
  2266 #endif
  2267 }
  2268 
  2269 int
  2270 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
  2271 {
  2272 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2273     int retval;
  2274 
  2275     if (!_this) {
  2276         SDL_UninitializedVideo();
  2277         return -1;
  2278     }
  2279     retval = 0;
  2280     switch (attr) {
  2281     case SDL_GL_RED_SIZE:
  2282         _this->gl_config.red_size = value;
  2283         break;
  2284     case SDL_GL_GREEN_SIZE:
  2285         _this->gl_config.green_size = value;
  2286         break;
  2287     case SDL_GL_BLUE_SIZE:
  2288         _this->gl_config.blue_size = value;
  2289         break;
  2290     case SDL_GL_ALPHA_SIZE:
  2291         _this->gl_config.alpha_size = value;
  2292         break;
  2293     case SDL_GL_DOUBLEBUFFER:
  2294         _this->gl_config.double_buffer = value;
  2295         break;
  2296     case SDL_GL_BUFFER_SIZE:
  2297         _this->gl_config.buffer_size = value;
  2298         break;
  2299     case SDL_GL_DEPTH_SIZE:
  2300         _this->gl_config.depth_size = value;
  2301         break;
  2302     case SDL_GL_STENCIL_SIZE:
  2303         _this->gl_config.stencil_size = value;
  2304         break;
  2305     case SDL_GL_ACCUM_RED_SIZE:
  2306         _this->gl_config.accum_red_size = value;
  2307         break;
  2308     case SDL_GL_ACCUM_GREEN_SIZE:
  2309         _this->gl_config.accum_green_size = value;
  2310         break;
  2311     case SDL_GL_ACCUM_BLUE_SIZE:
  2312         _this->gl_config.accum_blue_size = value;
  2313         break;
  2314     case SDL_GL_ACCUM_ALPHA_SIZE:
  2315         _this->gl_config.accum_alpha_size = value;
  2316         break;
  2317     case SDL_GL_STEREO:
  2318         _this->gl_config.stereo = value;
  2319         break;
  2320     case SDL_GL_MULTISAMPLEBUFFERS:
  2321         _this->gl_config.multisamplebuffers = value;
  2322         break;
  2323     case SDL_GL_MULTISAMPLESAMPLES:
  2324         _this->gl_config.multisamplesamples = value;
  2325         break;
  2326     case SDL_GL_ACCELERATED_VISUAL:
  2327         _this->gl_config.accelerated = value;
  2328         break;
  2329     case SDL_GL_RETAINED_BACKING:
  2330         _this->gl_config.retained_backing = value;
  2331         break;
  2332     default:
  2333         SDL_SetError("Unknown OpenGL attribute");
  2334         retval = -1;
  2335         break;
  2336     }
  2337     return retval;
  2338 #else
  2339     SDL_Unsupported();
  2340     return -1;
  2341 #endif /* SDL_VIDEO_OPENGL */
  2342 }
  2343 
  2344 int
  2345 SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
  2346 {
  2347 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2348     void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2349     GLenum attrib = 0;
  2350 
  2351     glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2352     if (!glGetIntegervFunc) {
  2353         return -1;
  2354     }
  2355     switch (attr) {
  2356     case SDL_GL_RETAINED_BACKING:
  2357         *value = _this->gl_config.retained_backing;
  2358         return 0;
  2359     case SDL_GL_RED_SIZE:
  2360         attrib = GL_RED_BITS;
  2361         break;
  2362     case SDL_GL_BLUE_SIZE:
  2363         attrib = GL_BLUE_BITS;
  2364         break;
  2365     case SDL_GL_GREEN_SIZE:
  2366         attrib = GL_GREEN_BITS;
  2367         break;
  2368     case SDL_GL_ALPHA_SIZE:
  2369         attrib = GL_ALPHA_BITS;
  2370         break;
  2371     case SDL_GL_DOUBLEBUFFER:
  2372 #ifndef SDL_VIDEO_OPENGL_ES
  2373         attrib = GL_DOUBLEBUFFER;
  2374         break;
  2375 #else
  2376         /*
  2377          * I believe double buffering is the only option in OpenGL ES
  2378          * -- in any case, GL_DOUBLEBUFFER doesn't exist
  2379          */
  2380         *value = 1;
  2381         return 0;
  2382 #endif
  2383     case SDL_GL_DEPTH_SIZE:
  2384         attrib = GL_DEPTH_BITS;
  2385         break;
  2386     case SDL_GL_STENCIL_SIZE:
  2387         attrib = GL_STENCIL_BITS;
  2388         break;
  2389 #ifndef SDL_VIDEO_OPENGL_ES
  2390     case SDL_GL_ACCUM_RED_SIZE:
  2391         attrib = GL_ACCUM_RED_BITS;
  2392         break;
  2393     case SDL_GL_ACCUM_GREEN_SIZE:
  2394         attrib = GL_ACCUM_GREEN_BITS;
  2395         break;
  2396     case SDL_GL_ACCUM_BLUE_SIZE:
  2397         attrib = GL_ACCUM_BLUE_BITS;
  2398         break;
  2399     case SDL_GL_ACCUM_ALPHA_SIZE:
  2400         attrib = GL_ACCUM_ALPHA_BITS;
  2401         break;
  2402     case SDL_GL_STEREO:
  2403         attrib = GL_STEREO;
  2404         break;
  2405 #else
  2406     case SDL_GL_ACCUM_RED_SIZE:
  2407     case SDL_GL_ACCUM_GREEN_SIZE:
  2408     case SDL_GL_ACCUM_BLUE_SIZE:
  2409     case SDL_GL_ACCUM_ALPHA_SIZE:
  2410     case SDL_GL_STEREO:
  2411         /* none of these are supported in OpenGL ES */
  2412         *value = 0;
  2413         return 0;
  2414 #endif
  2415     case SDL_GL_MULTISAMPLEBUFFERS:
  2416 #ifndef SDL_VIDEO_OPENGL_ES
  2417         attrib = GL_SAMPLE_BUFFERS_ARB;
  2418 #else
  2419         attrib = GL_SAMPLE_BUFFERS;
  2420 #endif
  2421         break;
  2422     case SDL_GL_MULTISAMPLESAMPLES:
  2423 #ifndef SDL_VIDEO_OPENGL_ES
  2424         attrib = GL_SAMPLES_ARB;
  2425 #else
  2426         attrib = GL_SAMPLES;
  2427 #endif
  2428         break;
  2429     case SDL_GL_BUFFER_SIZE:
  2430         {
  2431             GLint bits = 0;
  2432             GLint component;
  2433 
  2434             /*
  2435              * there doesn't seem to be a single flag in OpenGL
  2436              * for this!
  2437              */
  2438             glGetIntegervFunc(GL_RED_BITS, &component);
  2439             bits += component;
  2440             glGetIntegervFunc(GL_GREEN_BITS, &component);
  2441             bits += component;
  2442             glGetIntegervFunc(GL_BLUE_BITS, &component);
  2443             bits += component;
  2444             glGetIntegervFunc(GL_ALPHA_BITS, &component);
  2445             bits += component;
  2446 
  2447             *value = bits;
  2448             return 0;
  2449         }
  2450     case SDL_GL_ACCELERATED_VISUAL:
  2451         {
  2452             /* FIXME: How do we get this information? */
  2453             *value = (_this->gl_config.accelerated != 0);
  2454             return 0;
  2455         }
  2456     default:
  2457         SDL_SetError("Unknown OpenGL attribute");
  2458         return -1;
  2459     }
  2460 
  2461     glGetIntegervFunc(attrib, (GLint *) value);
  2462     return 0;
  2463 #else
  2464     SDL_Unsupported();
  2465     return -1;
  2466 #endif /* SDL_VIDEO_OPENGL */
  2467 }
  2468 
  2469 SDL_GLContext
  2470 SDL_GL_CreateContext(SDL_WindowID windowID)
  2471 {
  2472     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2473 
  2474     if (!window) {
  2475         return NULL;
  2476     }
  2477     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2478         SDL_SetError("The specified window isn't an OpenGL window");
  2479         return NULL;
  2480     }
  2481     return _this->GL_CreateContext(_this, window);
  2482 }
  2483 
  2484 int
  2485 SDL_GL_MakeCurrent(SDL_WindowID windowID, SDL_GLContext context)
  2486 {
  2487     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2488 
  2489     if (window && !(window->flags & SDL_WINDOW_OPENGL)) {
  2490         SDL_SetError("The specified window isn't an OpenGL window");
  2491         return -1;
  2492     }
  2493     if (!context) {
  2494         window = NULL;
  2495     }
  2496     return _this->GL_MakeCurrent(_this, window, context);
  2497 }
  2498 
  2499 int
  2500 SDL_GL_SetSwapInterval(int interval)
  2501 {
  2502     if (!_this) {
  2503         SDL_UninitializedVideo();
  2504         return -1;
  2505     }
  2506     if (_this->GL_SetSwapInterval) {
  2507         return _this->GL_SetSwapInterval(_this, interval);
  2508     } else {
  2509         SDL_SetError("Setting the swap interval is not supported");
  2510         return -1;
  2511     }
  2512 }
  2513 
  2514 int
  2515 SDL_GL_GetSwapInterval(void)
  2516 {
  2517     if (!_this) {
  2518         SDL_UninitializedVideo();
  2519         return -1;
  2520     }
  2521     if (_this->GL_GetSwapInterval) {
  2522         return _this->GL_GetSwapInterval(_this);
  2523     } else {
  2524         SDL_SetError("Getting the swap interval is not supported");
  2525         return -1;
  2526     }
  2527 }
  2528 
  2529 void
  2530 SDL_GL_SwapWindow(SDL_WindowID windowID)
  2531 {
  2532     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2533 
  2534     if (!window) {
  2535         return;
  2536     }
  2537     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2538         SDL_SetError("The specified window isn't an OpenGL window");
  2539         return;
  2540     }
  2541     _this->GL_SwapWindow(_this, window);
  2542 }
  2543 
  2544 void
  2545 SDL_GL_DeleteContext(SDL_GLContext context)
  2546 {
  2547     if (!_this || !context) {
  2548         return;
  2549     }
  2550     _this->GL_MakeCurrent(_this, NULL, NULL);
  2551     _this->GL_DeleteContext(_this, context);
  2552 }
  2553 
  2554 #if 0                           // FIXME
  2555 /*
  2556  * Utility function used by SDL_WM_SetIcon(); flags & 1 for color key, flags
  2557  * & 2 for alpha channel.
  2558  */
  2559 static void
  2560 CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
  2561 {
  2562     int x, y;
  2563     Uint32 colorkey;
  2564 #define SET_MASKBIT(icon, x, y, mask) \
  2565 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  2566 
  2567     colorkey = icon->format->colorkey;
  2568     switch (icon->format->BytesPerPixel) {
  2569     case 1:
  2570         {
  2571             Uint8 *pixels;
  2572             for (y = 0; y < icon->h; ++y) {
  2573                 pixels = (Uint8 *) icon->pixels + y * icon->pitch;
  2574                 for (x = 0; x < icon->w; ++x) {
  2575                     if (*pixels++ == colorkey) {
  2576                         SET_MASKBIT(icon, x, y, mask);
  2577                     }
  2578                 }
  2579             }
  2580         }
  2581         break;
  2582 
  2583     case 2:
  2584         {
  2585             Uint16 *pixels;
  2586             for (y = 0; y < icon->h; ++y) {
  2587                 pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
  2588                 for (x = 0; x < icon->w; ++x) {
  2589                     if ((flags & 1) && *pixels == colorkey) {
  2590                         SET_MASKBIT(icon, x, y, mask);
  2591                     } else if ((flags & 2)
  2592                                && (*pixels & icon->format->Amask) == 0) {
  2593                         SET_MASKBIT(icon, x, y, mask);
  2594                     }
  2595                     pixels++;
  2596                 }
  2597             }
  2598         }
  2599         break;
  2600 
  2601     case 4:
  2602         {
  2603             Uint32 *pixels;
  2604             for (y = 0; y < icon->h; ++y) {
  2605                 pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
  2606                 for (x = 0; x < icon->w; ++x) {
  2607                     if ((flags & 1) && *pixels == colorkey) {
  2608                         SET_MASKBIT(icon, x, y, mask);
  2609                     } else if ((flags & 2)
  2610                                && (*pixels & icon->format->Amask) == 0) {
  2611                         SET_MASKBIT(icon, x, y, mask);
  2612                     }
  2613                     pixels++;
  2614                 }
  2615             }
  2616         }
  2617         break;
  2618     }
  2619 }
  2620 
  2621 /*
  2622  * Sets the window manager icon for the display window.
  2623  */
  2624 void
  2625 SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
  2626 {
  2627     if (icon && _this->SetIcon) {
  2628         /* Generate a mask if necessary, and create the icon! */
  2629         if (mask == NULL) {
  2630             int mask_len = icon->h * (icon->w + 7) / 8;
  2631             int flags = 0;
  2632             mask = (Uint8 *) SDL_malloc(mask_len);
  2633             if (mask == NULL) {
  2634                 return;
  2635             }
  2636             SDL_memset(mask, ~0, mask_len);
  2637             if (icon->flags & SDL_SRCCOLORKEY)
  2638                 flags |= 1;
  2639             if (icon->flags & SDL_SRCALPHA)
  2640                 flags |= 2;
  2641             if (flags) {
  2642                 CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  2643             }
  2644             _this->SetIcon(_this, icon, mask);
  2645             SDL_free(mask);
  2646         } else {
  2647             _this->SetIcon(_this, icon, mask);
  2648         }
  2649     }
  2650 }
  2651 #endif
  2652 
  2653 SDL_bool
  2654 SDL_GetWindowWMInfo(SDL_WindowID windowID, struct SDL_SysWMinfo *info)
  2655 {
  2656     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2657 
  2658     if (!window || !_this->GetWindowWMInfo) {
  2659         return SDL_FALSE;
  2660     }
  2661     return (_this->GetWindowWMInfo(_this, window, info));
  2662 }
  2663 
  2664 /* vi: set ts=4 sw=4 expandtab: */