src/video/SDL_video.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 17 Dec 2008 07:17:54 +0000
changeset 2875 91a7e08cd238
parent 2869 2fe507a2ef7d
child 2876 3fcb0d447bcd
permissions -rw-r--r--
* Implemented X11 fullscreen input grab
* Progress towards being able to toggle in and out of fullscreen mode
     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 static void SDL_UpdateWindowGrab(SDL_Window *window);
   127 
   128 static int
   129 cmpmodes(const void *A, const void *B)
   130 {
   131     SDL_DisplayMode a = *(const SDL_DisplayMode *) A;
   132     SDL_DisplayMode b = *(const SDL_DisplayMode *) B;
   133 
   134     if (a.w != b.w) {
   135         return b.w - a.w;
   136     }
   137     if (a.h != b.h) {
   138         return b.h - a.h;
   139     }
   140     if (SDL_BITSPERPIXEL(a.format) != SDL_BITSPERPIXEL(b.format)) {
   141         return SDL_BITSPERPIXEL(b.format) - SDL_BITSPERPIXEL(a.format);
   142     }
   143     if (a.refresh_rate != b.refresh_rate) {
   144         return b.refresh_rate - a.refresh_rate;
   145     }
   146     return 0;
   147 }
   148 
   149 static void
   150 SDL_UninitializedVideo()
   151 {
   152     SDL_SetError("Video subsystem has not been initialized");
   153 }
   154 
   155 int
   156 SDL_GetNumVideoDrivers(void)
   157 {
   158     return SDL_arraysize(bootstrap) - 1;
   159 }
   160 
   161 const char *
   162 SDL_GetVideoDriver(int index)
   163 {
   164     if (index >= 0 && index < SDL_GetNumVideoDrivers()) {
   165         return bootstrap[index]->name;
   166     }
   167     return NULL;
   168 }
   169 
   170 /*
   171  * Initialize the video and event subsystems -- determine native pixel format
   172  */
   173 int
   174 SDL_VideoInit(const char *driver_name, Uint32 flags)
   175 {
   176     SDL_VideoDevice *video;
   177     int index;
   178     int i;
   179 
   180     /* Toggle the event thread flags, based on OS requirements */
   181 #if defined(MUST_THREAD_EVENTS)
   182     flags |= SDL_INIT_EVENTTHREAD;
   183 #elif defined(CANT_THREAD_EVENTS)
   184     if ((flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD) {
   185         SDL_SetError("OS doesn't support threaded events");
   186         return -1;
   187     }
   188 #endif
   189 
   190     /* Start the event loop */
   191     if (SDL_StartEventLoop(flags) < 0) {
   192         return -1;
   193     }
   194     /* Check to make sure we don't overwrite '_this' */
   195     if (_this != NULL) {
   196         SDL_VideoQuit();
   197     }
   198     /* Select the proper video driver */
   199     index = 0;
   200     video = NULL;
   201     if (driver_name == NULL) {
   202         driver_name = SDL_getenv("SDL_VIDEODRIVER");
   203     }
   204     if (driver_name != NULL) {
   205         for (i = 0; bootstrap[i]; ++i) {
   206             if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) {
   207                 if (bootstrap[i]->available()) {
   208                     video = bootstrap[i]->create(index);
   209                 }
   210                 break;
   211             }
   212         }
   213     } else {
   214         for (i = 0; bootstrap[i]; ++i) {
   215             if (bootstrap[i]->available()) {
   216                 video = bootstrap[i]->create(index);
   217                 if (video != NULL) {
   218                     break;
   219                 }
   220             }
   221         }
   222     }
   223     if (video == NULL) {
   224         if (driver_name) {
   225             SDL_SetError("%s not available", driver_name);
   226         } else {
   227             SDL_SetError("No available video device");
   228         }
   229         return -1;
   230     }
   231     _this = video;
   232     _this->name = bootstrap[i]->name;
   233     _this->next_object_id = 1;
   234 
   235 
   236     /* Set some very sane GL defaults */
   237     _this->gl_config.driver_loaded = 0;
   238     _this->gl_config.dll_handle = NULL;
   239     _this->gl_config.red_size = 3;
   240     _this->gl_config.green_size = 3;
   241     _this->gl_config.blue_size = 2;
   242     _this->gl_config.alpha_size = 0;
   243     _this->gl_config.buffer_size = 0;
   244     _this->gl_config.depth_size = 16;
   245     _this->gl_config.stencil_size = 0;
   246     _this->gl_config.double_buffer = 1;
   247     _this->gl_config.accum_red_size = 0;
   248     _this->gl_config.accum_green_size = 0;
   249     _this->gl_config.accum_blue_size = 0;
   250     _this->gl_config.accum_alpha_size = 0;
   251     _this->gl_config.stereo = 0;
   252     _this->gl_config.multisamplebuffers = 0;
   253     _this->gl_config.multisamplesamples = 0;
   254     _this->gl_config.retained_backing = 1;
   255     _this->gl_config.accelerated = -1;  /* not known, don't set */
   256 
   257     /* Initialize the video subsystem */
   258     if (_this->VideoInit(_this) < 0) {
   259         SDL_VideoQuit();
   260         return -1;
   261     }
   262     /* Make sure some displays were added */
   263     if (_this->num_displays == 0) {
   264         SDL_SetError("The video driver did not add any displays");
   265         SDL_VideoQuit();
   266         return (-1);
   267     }
   268     /* The software renderer is always available */
   269     for (i = 0; i < _this->num_displays; ++i) {
   270 #if SDL_VIDEO_RENDER_OGL
   271         SDL_AddRenderDriver(i, &GL_RenderDriver);
   272 #endif
   273 
   274 #if SDL_VIDEO_RENDER_OGL_ES
   275         SDL_AddRenderDriver(i, &GL_ES_RenderDriver);
   276 #endif
   277         if (_this->displays[i].num_render_drivers > 0) {
   278             SDL_AddRenderDriver(i, &SW_RenderDriver);
   279         }
   280     }
   281 
   282     /* We're ready to go! */
   283     return 0;
   284 }
   285 
   286 const char *
   287 SDL_GetCurrentVideoDriver()
   288 {
   289     if (!_this) {
   290         SDL_UninitializedVideo();
   291         return NULL;
   292     }
   293     return _this->name;
   294 }
   295 
   296 SDL_VideoDevice *
   297 SDL_GetVideoDevice()
   298 {
   299     return _this;
   300 }
   301 
   302 int
   303 SDL_AddBasicVideoDisplay(const SDL_DisplayMode * desktop_mode)
   304 {
   305     SDL_VideoDisplay display;
   306 
   307     SDL_zero(display);
   308     if (desktop_mode) {
   309         display.desktop_mode = *desktop_mode;
   310     }
   311     display.current_mode = display.desktop_mode;
   312 
   313     return SDL_AddVideoDisplay(&display);
   314 }
   315 
   316 int
   317 SDL_AddVideoDisplay(const SDL_VideoDisplay * display)
   318 {
   319     SDL_VideoDisplay *displays;
   320     int index = -1;
   321 
   322     displays =
   323         SDL_realloc(_this->displays,
   324                     (_this->num_displays + 1) * sizeof(*displays));
   325     if (displays) {
   326         index = _this->num_displays++;
   327         displays[index] = *display;
   328         displays[index].device = _this;
   329         _this->displays = displays;
   330     } else {
   331         SDL_OutOfMemory();
   332     }
   333     return index;
   334 }
   335 
   336 int
   337 SDL_GetNumVideoDisplays(void)
   338 {
   339     if (!_this) {
   340         SDL_UninitializedVideo();
   341         return 0;
   342     }
   343     return _this->num_displays;
   344 }
   345 
   346 int
   347 SDL_SelectVideoDisplay(int index)
   348 {
   349     if (!_this) {
   350         SDL_UninitializedVideo();
   351         return (-1);
   352     }
   353     if (index < 0 || index >= _this->num_displays) {
   354         SDL_SetError("index must be in the range 0 - %d",
   355                      _this->num_displays - 1);
   356         return -1;
   357     }
   358     _this->current_display = index;
   359     return 0;
   360 }
   361 
   362 int
   363 SDL_GetCurrentVideoDisplay(void)
   364 {
   365     if (!_this) {
   366         SDL_UninitializedVideo();
   367         return (-1);
   368     }
   369     return _this->current_display;
   370 }
   371 
   372 SDL_bool
   373 SDL_AddDisplayMode(int displayIndex, const SDL_DisplayMode * mode)
   374 {
   375     SDL_VideoDisplay *display = &_this->displays[displayIndex];
   376     SDL_DisplayMode *modes;
   377     int i, nmodes;
   378 
   379     /* Make sure we don't already have the mode in the list */
   380     modes = display->display_modes;
   381     nmodes = display->num_display_modes;
   382     for (i = nmodes; i--;) {
   383         if (SDL_memcmp(mode, &modes[i], sizeof(*mode)) == 0) {
   384             return SDL_FALSE;
   385         }
   386     }
   387 
   388     /* Go ahead and add the new mode */
   389     if (nmodes == display->max_display_modes) {
   390         modes =
   391             SDL_realloc(modes,
   392                         (display->max_display_modes + 32) * sizeof(*modes));
   393         if (!modes) {
   394             return SDL_FALSE;
   395         }
   396         display->display_modes = modes;
   397         display->max_display_modes += 32;
   398     }
   399     modes[nmodes] = *mode;
   400     display->num_display_modes++;
   401 
   402     return SDL_TRUE;
   403 }
   404 
   405 int
   406 SDL_GetNumDisplayModes()
   407 {
   408     if (_this) {
   409         SDL_VideoDisplay *display = &SDL_CurrentDisplay;
   410         if (!display->num_display_modes && _this->GetDisplayModes) {
   411             _this->GetDisplayModes(_this);
   412             SDL_qsort(display->display_modes, display->num_display_modes,
   413                       sizeof(SDL_DisplayMode), cmpmodes);
   414         }
   415         return display->num_display_modes;
   416     }
   417     return 0;
   418 }
   419 
   420 int
   421 SDL_GetDisplayMode(int index, SDL_DisplayMode * mode)
   422 {
   423     if (index < 0 || index >= SDL_GetNumDisplayModes()) {
   424         SDL_SetError("index must be in the range of 0 - %d",
   425                      SDL_GetNumDisplayModes() - 1);
   426         return -1;
   427     }
   428     if (mode) {
   429         *mode = SDL_CurrentDisplay.display_modes[index];
   430     }
   431     return 0;
   432 }
   433 
   434 int
   435 SDL_GetDesktopDisplayMode(SDL_DisplayMode * mode)
   436 {
   437     if (!_this) {
   438         SDL_UninitializedVideo();
   439         return -1;
   440     }
   441     if (mode) {
   442         *mode = SDL_CurrentDisplay.desktop_mode;
   443     }
   444     return 0;
   445 }
   446 
   447 int
   448 SDL_GetCurrentDisplayMode(SDL_DisplayMode * mode)
   449 {
   450     if (!_this) {
   451         SDL_UninitializedVideo();
   452         return -1;
   453     }
   454     if (mode) {
   455         *mode = SDL_CurrentDisplay.current_mode;
   456     }
   457     return 0;
   458 }
   459 
   460 SDL_DisplayMode *
   461 SDL_GetClosestDisplayMode(const SDL_DisplayMode * mode,
   462                           SDL_DisplayMode * closest)
   463 {
   464     Uint32 target_format;
   465     int target_refresh_rate;
   466     int i;
   467     SDL_DisplayMode *current, *match;
   468 
   469     if (!_this || !mode || !closest) {
   470         return NULL;
   471     }
   472     /* Default to the desktop format */
   473     if (mode->format) {
   474         target_format = mode->format;
   475     } else {
   476         target_format = SDL_CurrentDisplay.desktop_mode.format;
   477     }
   478 
   479     /* Default to the desktop refresh rate */
   480     if (mode->refresh_rate) {
   481         target_refresh_rate = mode->refresh_rate;
   482     } else {
   483         target_refresh_rate = SDL_CurrentDisplay.desktop_mode.refresh_rate;
   484     }
   485 
   486     match = NULL;
   487     for (i = 0; i < SDL_GetNumDisplayModes(); ++i) {
   488         current = &SDL_CurrentDisplay.display_modes[i];
   489 
   490         if (current->w && (current->w < mode->w)) {
   491             /* Out of sorted modes large enough here */
   492             break;
   493         }
   494         if (current->h && (current->h < mode->h)) {
   495             if (current->w && (current->w == mode->w)) {
   496                 /* Out of sorted modes large enough here */
   497                 break;
   498             }
   499             /* Wider, but not tall enough, due to a different
   500                aspect ratio. This mode must be skipped, but closer
   501                modes may still follow. */
   502             continue;
   503         }
   504         if (!match || current->w < match->w || current->h < match->h) {
   505             match = current;
   506             continue;
   507         }
   508         if (current->format != match->format) {
   509             /* Sorted highest depth to lowest */
   510             if (current->format == target_format ||
   511                 (SDL_BITSPERPIXEL(current->format) >=
   512                  SDL_BITSPERPIXEL(target_format)
   513                  && SDL_PIXELTYPE(current->format) ==
   514                  SDL_PIXELTYPE(target_format))) {
   515                 match = current;
   516             }
   517             continue;
   518         }
   519         if (current->refresh_rate != match->refresh_rate) {
   520             /* Sorted highest refresh to lowest */
   521             if (current->refresh_rate >= target_refresh_rate) {
   522                 match = current;
   523             }
   524         }
   525     }
   526     if (match) {
   527         if (match->format) {
   528             closest->format = match->format;
   529         } else {
   530             closest->format = mode->format;
   531         }
   532         if (match->w && match->h) {
   533             closest->w = match->w;
   534             closest->h = match->h;
   535         } else {
   536             closest->w = mode->w;
   537             closest->h = mode->h;
   538         }
   539         if (match->refresh_rate) {
   540             closest->refresh_rate = match->refresh_rate;
   541         } else {
   542             closest->refresh_rate = mode->refresh_rate;
   543         }
   544         closest->driverdata = match->driverdata;
   545 
   546         /*
   547          * Pick some reasonable defaults if the app and driver don't
   548          * care
   549          */
   550         if (!closest->format) {
   551             closest->format = SDL_PIXELFORMAT_RGB888;
   552         }
   553         if (!closest->w) {
   554             closest->w = 640;
   555         }
   556         if (!closest->h) {
   557             closest->h = 480;
   558         }
   559         return closest;
   560     }
   561     return NULL;
   562 }
   563 
   564 int
   565 SDL_SetDisplayMode(const SDL_DisplayMode * mode)
   566 {
   567     SDL_VideoDisplay *display;
   568     SDL_DisplayMode display_mode;
   569     SDL_DisplayMode current_mode;
   570     int i, ncolors;
   571 
   572     if (!_this) {
   573         SDL_UninitializedVideo();
   574         return -1;
   575     }
   576     display = &SDL_CurrentDisplay;
   577     if (!mode) {
   578         mode = &display->desktop_mode;
   579     }
   580     display_mode = *mode;
   581 
   582     /* Default to the current mode */
   583     if (!display_mode.format) {
   584         display_mode.format = display->current_mode.format;
   585     }
   586     if (!display_mode.w) {
   587         display_mode.w = display->current_mode.w;
   588     }
   589     if (!display_mode.h) {
   590         display_mode.h = display->current_mode.h;
   591     }
   592     if (!display_mode.refresh_rate) {
   593         display_mode.refresh_rate = display->current_mode.refresh_rate;
   594     }
   595     /* Get a good video mode, the closest one possible */
   596     if (!SDL_GetClosestDisplayMode(&display_mode, &display_mode)) {
   597         SDL_SetError("No video mode large enough for %dx%d",
   598                      display_mode.w, display_mode.h);
   599         return -1;
   600     }
   601     /* See if there's anything left to do */
   602     SDL_GetCurrentDisplayMode(&current_mode);
   603     if (SDL_memcmp(&display_mode, &current_mode, sizeof(display_mode)) == 0) {
   604         return 0;
   605     }
   606     /* Actually change the display mode */
   607     if (_this->SetDisplayMode(_this, &display_mode) < 0) {
   608         return -1;
   609     }
   610     display->current_mode = display_mode;
   611 
   612     /* Set up a palette, if necessary */
   613     if (SDL_ISPIXELFORMAT_INDEXED(display_mode.format)) {
   614         ncolors = (1 << SDL_BITSPERPIXEL(display_mode.format));
   615     } else {
   616         ncolors = 0;
   617     }
   618     if ((!ncolors && display->palette) || (ncolors && !display->palette)
   619         || (ncolors && ncolors != display->palette->ncolors)) {
   620         if (display->palette) {
   621             SDL_FreePalette(display->palette);
   622             display->palette = NULL;
   623         }
   624         if (ncolors) {
   625             display->palette = SDL_AllocPalette(ncolors);
   626             if (!display->palette) {
   627                 return -1;
   628             }
   629             SDL_DitherColors(display->palette->colors,
   630                              SDL_BITSPERPIXEL(display_mode.format));
   631         }
   632     }
   633     /* Move any fullscreen windows into position */
   634     for (i = 0; i < display->num_windows; ++i) {
   635         SDL_Window *window = &display->windows[i];
   636         if (FULLSCREEN_VISIBLE(window)) {
   637             SDL_SetWindowPosition(window->id, window->x, window->y);
   638         }
   639     }
   640 
   641     return 0;
   642 }
   643 
   644 int
   645 SDL_SetFullscreenDisplayMode(const SDL_DisplayMode * mode)
   646 {
   647     SDL_VideoDisplay *display;
   648     SDL_DisplayMode fullscreen_mode;
   649     int i;
   650 
   651     if (!_this) {
   652         SDL_UninitializedVideo();
   653         return -1;
   654     }
   655     display = &SDL_CurrentDisplay;
   656     if (!mode) {
   657         mode = &display->desktop_mode;
   658     }
   659     if (!SDL_GetClosestDisplayMode(mode, &fullscreen_mode)) {
   660         SDL_SetError("Couldn't find display mode match");
   661         return -1;
   662     }
   663     if (SDL_memcmp
   664         (&fullscreen_mode, &display->fullscreen_mode,
   665          sizeof(fullscreen_mode)) == 0) {
   666         /* Nothing to do... */
   667         return 0;
   668     }
   669     display->fullscreen_mode = fullscreen_mode;
   670 
   671     /* Actually set the mode if we have a fullscreen window visible */
   672     for (i = 0; i < display->num_windows; ++i) {
   673         SDL_Window *window = &display->windows[i];
   674         if (FULLSCREEN_VISIBLE(window)) {
   675             if (SDL_SetDisplayMode(&display->fullscreen_mode) < 0) {
   676                 return -1;
   677             }
   678         }
   679         if (window->flags & SDL_WINDOW_FULLSCREEN) {
   680             SDL_OnWindowResized(window);
   681         }
   682     }
   683     return 0;
   684 }
   685 
   686 int
   687 SDL_GetFullscreenDisplayMode(SDL_DisplayMode * mode)
   688 {
   689     if (!_this) {
   690         SDL_UninitializedVideo();
   691         return -1;
   692     }
   693     if (mode) {
   694         *mode = SDL_CurrentDisplay.fullscreen_mode;
   695     }
   696     return 0;
   697 }
   698 
   699 int
   700 SDL_SetDisplayPalette(const SDL_Color * colors, int firstcolor, int ncolors)
   701 {
   702     SDL_Palette *palette;
   703     int status = 0;
   704 
   705     if (!_this) {
   706         SDL_UninitializedVideo();
   707         return -1;
   708     }
   709     palette = SDL_CurrentDisplay.palette;
   710     if (!palette) {
   711         SDL_SetError("Display mode does not have a palette");
   712         return -1;
   713     }
   714     status = SDL_SetPaletteColors(palette, colors, firstcolor, ncolors);
   715 
   716     if (_this->SetDisplayPalette) {
   717         if (_this->SetDisplayPalette(_this, palette) < 0) {
   718             status = -1;
   719         }
   720     }
   721     return status;
   722 }
   723 
   724 int
   725 SDL_GetDisplayPalette(SDL_Color * colors, int firstcolor, int ncolors)
   726 {
   727     SDL_Palette *palette;
   728 
   729     if (!_this) {
   730         SDL_UninitializedVideo();
   731         return -1;
   732     }
   733     palette = SDL_CurrentDisplay.palette;
   734     if (!palette->ncolors) {
   735         SDL_SetError("Display mode does not have a palette");
   736         return -1;
   737     }
   738     if (firstcolor < 0 || (firstcolor + ncolors) > palette->ncolors) {
   739         SDL_SetError("Palette indices are out of range");
   740         return -1;
   741     }
   742     SDL_memcpy(colors, &palette->colors[firstcolor],
   743                ncolors * sizeof(*colors));
   744     return 0;
   745 }
   746 
   747 SDL_WindowID
   748 SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
   749 {
   750     const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
   751                                   SDL_WINDOW_OPENGL |
   752                                   SDL_WINDOW_BORDERLESS |
   753                                   SDL_WINDOW_RESIZABLE |
   754                                   SDL_WINDOW_INPUT_GRABBED);
   755     SDL_VideoDisplay *display;
   756     SDL_Window window;
   757     int num_windows;
   758     SDL_Window *windows;
   759 
   760     if (!_this) {
   761         SDL_UninitializedVideo();
   762         return 0;
   763     }
   764     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   765         SDL_SetError("No OpenGL support in video driver");
   766         return 0;
   767     }
   768     SDL_zero(window);
   769     window.id = _this->next_object_id++;
   770     window.x = x;
   771     window.y = y;
   772     window.w = w;
   773     window.h = h;
   774     window.flags = (flags & allowed_flags);
   775     window.display = _this->current_display;
   776 
   777     if (_this->CreateWindow && _this->CreateWindow(_this, &window) < 0) {
   778         return 0;
   779     }
   780     display = &SDL_CurrentDisplay;
   781     num_windows = display->num_windows;
   782     windows =
   783         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   784     if (!windows) {
   785         if (_this->DestroyWindow) {
   786             _this->DestroyWindow(_this, &window);
   787         }
   788         return 0;
   789     }
   790     windows[num_windows] = window;
   791     display->windows = windows;
   792     display->num_windows++;
   793 
   794     if (title) {
   795         SDL_SetWindowTitle(window.id, title);
   796     }
   797     if (flags & SDL_WINDOW_MAXIMIZED) {
   798         SDL_MaximizeWindow(window.id);
   799     }
   800     if (flags & SDL_WINDOW_MINIMIZED) {
   801         SDL_MinimizeWindow(window.id);
   802     }
   803     if (flags & SDL_WINDOW_SHOWN) {
   804         SDL_ShowWindow(window.id);
   805     }
   806     SDL_UpdateWindowGrab(&window);
   807 
   808     return window.id;
   809 }
   810 
   811 SDL_WindowID
   812 SDL_CreateWindowFrom(const void *data)
   813 {
   814     SDL_VideoDisplay *display;
   815     SDL_Window window;
   816     int num_windows;
   817     SDL_Window *windows;
   818 
   819     if (!_this) {
   820         SDL_UninitializedVideo();
   821         return (0);
   822     }
   823     SDL_zero(window);
   824     window.id = _this->next_object_id++;
   825     window.display = _this->current_display;
   826 
   827     if (!_this->CreateWindowFrom ||
   828         _this->CreateWindowFrom(_this, &window, data) < 0) {
   829         return 0;
   830     }
   831     display = &SDL_CurrentDisplay;
   832     num_windows = display->num_windows;
   833     windows =
   834         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   835     if (!windows) {
   836         if (_this->DestroyWindow) {
   837             _this->DestroyWindow(_this, &window);
   838         }
   839         if (window.title) {
   840             SDL_free(window.title);
   841         }
   842         return 0;
   843     }
   844     windows[num_windows] = window;
   845     display->windows = windows;
   846     display->num_windows++;
   847 
   848     return window.id;
   849 }
   850 
   851 int
   852 SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
   853 {
   854     char *title = window->title;
   855 
   856     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   857         SDL_SetError("No OpenGL support in video driver");
   858         return -1;
   859     }
   860     if (_this->DestroyWindow) {
   861         _this->DestroyWindow(_this, window);
   862     }
   863     window->title = NULL;
   864     window->flags =
   865         (flags &
   866          ~(SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED | SDL_WINDOW_SHOWN |
   867            SDL_WINDOW_INPUT_GRABBED));
   868 
   869     if (_this->CreateWindow && _this->CreateWindow(_this, window) < 0) {
   870         return -1;
   871     }
   872     if (title) {
   873         SDL_SetWindowTitle(window->id, title);
   874         SDL_free(title);
   875     }
   876     if (flags & SDL_WINDOW_MAXIMIZED) {
   877         SDL_MaximizeWindow(window->id);
   878     }
   879     if (flags & SDL_WINDOW_MINIMIZED) {
   880         SDL_MinimizeWindow(window->id);
   881     }
   882     if (flags & SDL_WINDOW_SHOWN) {
   883         SDL_ShowWindow(window->id);
   884     }
   885     SDL_UpdateWindowGrab(window);
   886 
   887     return 0;
   888 }
   889 
   890 SDL_Window *
   891 SDL_GetWindowFromID(SDL_WindowID windowID)
   892 {
   893     int i, j;
   894 
   895     if (!_this) {
   896         SDL_UninitializedVideo();
   897         return NULL;
   898     }
   899     for (i = 0; i < _this->num_displays; ++i) {
   900         SDL_VideoDisplay *display = &_this->displays[i];
   901         for (j = 0; j < display->num_windows; ++j) {
   902             SDL_Window *window = &display->windows[j];
   903             if (window->id == windowID) {
   904                 return window;
   905             }
   906         }
   907     }
   908     return NULL;
   909 }
   910 
   911 SDL_VideoDisplay *
   912 SDL_GetDisplayFromWindow(SDL_Window * window)
   913 {
   914     if (!_this) {
   915         SDL_UninitializedVideo();
   916         return NULL;
   917     }
   918     if (!window) {
   919         return NULL;
   920     }
   921     return &_this->displays[window->display];
   922 }
   923 
   924 Uint32
   925 SDL_GetWindowFlags(SDL_WindowID windowID)
   926 {
   927     SDL_Window *window = SDL_GetWindowFromID(windowID);
   928 
   929     if (!window) {
   930         return 0;
   931     }
   932     return window->flags;
   933 }
   934 
   935 void
   936 SDL_SetWindowTitle(SDL_WindowID windowID, const char *title)
   937 {
   938     SDL_Window *window = SDL_GetWindowFromID(windowID);
   939 
   940     if (!window || title == window->title) {
   941         return;
   942     }
   943     if (window->title) {
   944         SDL_free(window->title);
   945     }
   946     if (title) {
   947         window->title = SDL_strdup(title);
   948     } else {
   949         window->title = NULL;
   950     }
   951 
   952     if (_this->SetWindowTitle) {
   953         _this->SetWindowTitle(_this, window);
   954     }
   955 }
   956 
   957 const char *
   958 SDL_GetWindowTitle(SDL_WindowID windowID)
   959 {
   960     SDL_Window *window = SDL_GetWindowFromID(windowID);
   961 
   962     if (!window) {
   963         return NULL;
   964     }
   965     return window->title;
   966 }
   967 
   968 void
   969 SDL_SetWindowData(SDL_WindowID windowID, void *userdata)
   970 {
   971     SDL_Window *window = SDL_GetWindowFromID(windowID);
   972 
   973     if (!window) {
   974         return;
   975     }
   976     window->userdata = userdata;
   977 }
   978 
   979 void *
   980 SDL_GetWindowData(SDL_WindowID windowID)
   981 {
   982     SDL_Window *window = SDL_GetWindowFromID(windowID);
   983 
   984     if (!window) {
   985         return NULL;
   986     }
   987     return window->userdata;
   988 }
   989 
   990 void
   991 SDL_SetWindowPosition(SDL_WindowID windowID, int x, int y)
   992 {
   993     SDL_Window *window = SDL_GetWindowFromID(windowID);
   994     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
   995 
   996     if (!window) {
   997         return;
   998     }
   999     if (x != SDL_WINDOWPOS_UNDEFINED) {
  1000         window->x = x;
  1001     }
  1002     if (y != SDL_WINDOWPOS_UNDEFINED) {
  1003         window->y = y;
  1004     }
  1005     if (_this->SetWindowPosition) {
  1006         _this->SetWindowPosition(_this, window);
  1007     }
  1008     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MOVED, x, y);
  1009 }
  1010 
  1011 void
  1012 SDL_GetWindowPosition(SDL_WindowID windowID, int *x, int *y)
  1013 {
  1014     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1015 
  1016     if (!window) {
  1017         return;
  1018     }
  1019     if (x) {
  1020         *x = window->x;
  1021     }
  1022     if (y) {
  1023         *y = window->y;
  1024     }
  1025 }
  1026 
  1027 void
  1028 SDL_SetWindowSize(SDL_WindowID windowID, int w, int h)
  1029 {
  1030     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1031 
  1032     if (!window) {
  1033         return;
  1034     }
  1035     window->w = w;
  1036     window->h = h;
  1037 
  1038     if (_this->SetWindowSize) {
  1039         _this->SetWindowSize(_this, window);
  1040     }
  1041     SDL_OnWindowResized(window);
  1042 }
  1043 
  1044 void
  1045 SDL_GetWindowSize(SDL_WindowID windowID, int *w, int *h)
  1046 {
  1047     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1048 
  1049     if (window) {
  1050         if (w) {
  1051             *w = window->w;
  1052         }
  1053         if (h) {
  1054             *h = window->h;
  1055         }
  1056     } else {
  1057         if (w) {
  1058             *w = 0;
  1059         }
  1060         if (h) {
  1061             *h = 0;
  1062         }
  1063     }
  1064 }
  1065 
  1066 void
  1067 SDL_ShowWindow(SDL_WindowID windowID)
  1068 {
  1069     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1070 
  1071     if (!window || (window->flags & SDL_WINDOW_SHOWN)) {
  1072         return;
  1073     }
  1074 
  1075     if (_this->ShowWindow) {
  1076         _this->ShowWindow(_this, window);
  1077     }
  1078     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_SHOWN, 0, 0);
  1079 }
  1080 
  1081 void
  1082 SDL_HideWindow(SDL_WindowID windowID)
  1083 {
  1084     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1085 
  1086     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1087         return;
  1088     }
  1089 
  1090     if (_this->HideWindow) {
  1091         _this->HideWindow(_this, window);
  1092     }
  1093     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_HIDDEN, 0, 0);
  1094 }
  1095 
  1096 void
  1097 SDL_RaiseWindow(SDL_WindowID windowID)
  1098 {
  1099     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1100 
  1101     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1102         return;
  1103     }
  1104     if (_this->RaiseWindow) {
  1105         _this->RaiseWindow(_this, window);
  1106     }
  1107 }
  1108 
  1109 void
  1110 SDL_MaximizeWindow(SDL_WindowID windowID)
  1111 {
  1112     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1113 
  1114     if (!window || (window->flags & SDL_WINDOW_MAXIMIZED)) {
  1115         return;
  1116     }
  1117 
  1118     if (_this->MaximizeWindow) {
  1119         _this->MaximizeWindow(_this, window);
  1120     }
  1121     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MAXIMIZED, 0, 0);
  1122 }
  1123 
  1124 void
  1125 SDL_MinimizeWindow(SDL_WindowID windowID)
  1126 {
  1127     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1128 
  1129     if (!window || (window->flags & SDL_WINDOW_MINIMIZED)) {
  1130         return;
  1131     }
  1132 
  1133     if (_this->MinimizeWindow) {
  1134         _this->MinimizeWindow(_this, window);
  1135     }
  1136     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MINIMIZED, 0, 0);
  1137 }
  1138 
  1139 void
  1140 SDL_RestoreWindow(SDL_WindowID windowID)
  1141 {
  1142     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1143 
  1144     if (!window
  1145         || (window->flags & (SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED))) {
  1146         return;
  1147     }
  1148 
  1149     if (_this->RestoreWindow) {
  1150         _this->RestoreWindow(_this, window);
  1151     }
  1152     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_RESTORED, 0, 0);
  1153 }
  1154 
  1155 int
  1156 SDL_SetWindowFullscreen(SDL_WindowID windowID, int fullscreen)
  1157 {
  1158     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1159 
  1160     if (!window) {
  1161         return -1;
  1162     }
  1163     if (fullscreen) {
  1164         fullscreen = SDL_WINDOW_FULLSCREEN;
  1165     }
  1166     if ((window->flags & SDL_WINDOW_FULLSCREEN) == fullscreen) {
  1167         return 0;
  1168     }
  1169     if (fullscreen) {
  1170         window->flags |= SDL_WINDOW_FULLSCREEN;
  1171 
  1172         if (FULLSCREEN_VISIBLE(window)) {
  1173             SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1174 
  1175             /* Hide any other fullscreen windows */
  1176             int i;
  1177             for (i = 0; i < display->num_windows; ++i) {
  1178                 SDL_Window *other = &display->windows[i];
  1179                 if (other->id != windowID && FULLSCREEN_VISIBLE(other)) {
  1180                     SDL_MinimizeWindow(other->id);
  1181                 }
  1182             }
  1183 
  1184             SDL_SetDisplayMode(&display->fullscreen_mode);
  1185         }
  1186     } else {
  1187         window->flags &= ~SDL_WINDOW_FULLSCREEN;
  1188 
  1189         if (FULLSCREEN_VISIBLE(window)) {
  1190             SDL_SetDisplayMode(NULL);
  1191         }
  1192     }
  1193     return 0;
  1194 }
  1195 
  1196 void
  1197 SDL_SetWindowGrab(SDL_WindowID windowID, int mode)
  1198 {
  1199     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1200 
  1201     if (!window || (!!mode == !!(window->flags & SDL_WINDOW_INPUT_GRABBED))) {
  1202         return;
  1203     }
  1204     if (mode) {
  1205         window->flags |= SDL_WINDOW_INPUT_GRABBED;
  1206     } else {
  1207         window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
  1208     }
  1209     SDL_UpdateWindowGrab(window);
  1210 }
  1211 
  1212 static void
  1213 SDL_UpdateWindowGrab(SDL_Window *window)
  1214 {
  1215     if ((window->flags & SDL_WINDOW_INPUT_FOCUS) && _this->SetWindowGrab) {
  1216         _this->SetWindowGrab(_this, window);
  1217     }
  1218 }
  1219 
  1220 int
  1221 SDL_GetWindowGrab(SDL_WindowID windowID)
  1222 {
  1223     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1224 
  1225     if (!window) {
  1226         return 0;
  1227     }
  1228     return ((window->flags & SDL_WINDOW_INPUT_GRABBED) != 0);
  1229 }
  1230 
  1231 void
  1232 SDL_OnWindowShown(SDL_Window * window)
  1233 {
  1234     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1235         SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_FOCUS_GAINED, 0, 0);
  1236     }
  1237 }
  1238 
  1239 void
  1240 SDL_OnWindowHidden(SDL_Window * window)
  1241 {
  1242     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1243         SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
  1244     }
  1245 }
  1246 
  1247 void
  1248 SDL_OnWindowResized(SDL_Window * window)
  1249 {
  1250     SDL_Renderer *renderer = window->renderer;
  1251 
  1252     if (renderer && renderer->DisplayModeChanged) {
  1253         renderer->DisplayModeChanged(renderer);
  1254     }
  1255 }
  1256 
  1257 void
  1258 SDL_OnWindowFocusGained(SDL_Window * window)
  1259 {
  1260     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1261 
  1262     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1263         SDL_SetDisplayMode(&display->fullscreen_mode);
  1264     }
  1265     if (display->gamma && _this->SetDisplayGammaRamp) {
  1266         _this->SetDisplayGammaRamp(_this, display->gamma);
  1267     }
  1268     if ((window->flags & (SDL_WINDOW_INPUT_GRABBED|SDL_WINDOW_FULLSCREEN)) && _this->SetWindowGrab) {
  1269         _this->SetWindowGrab(_this, window);
  1270     }
  1271 }
  1272 
  1273 void
  1274 SDL_OnWindowFocusLost(SDL_Window * window)
  1275 {
  1276     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1277 
  1278     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1279         SDL_MinimizeWindow(window->id);
  1280         SDL_SetDisplayMode(NULL);
  1281     }
  1282     if (display->gamma && _this->SetDisplayGammaRamp) {
  1283         _this->SetDisplayGammaRamp(_this, display->saved_gamma);
  1284     }
  1285     if ((window->flags & (SDL_WINDOW_INPUT_GRABBED|SDL_WINDOW_FULLSCREEN)) && _this->SetWindowGrab) {
  1286         _this->SetWindowGrab(_this, window);
  1287     }
  1288 }
  1289 
  1290 SDL_WindowID
  1291 SDL_GetFocusWindow(void)
  1292 {
  1293     SDL_VideoDisplay *display;
  1294     int i;
  1295 
  1296     if (!_this) {
  1297         return 0;
  1298     }
  1299     display = &SDL_CurrentDisplay;
  1300     for (i = 0; i < display->num_windows; ++i) {
  1301         SDL_Window *window = &display->windows[i];
  1302 
  1303         if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
  1304             return window->id;
  1305         }
  1306     }
  1307     return 0;
  1308 }
  1309 
  1310 void
  1311 SDL_DestroyWindow(SDL_WindowID windowID)
  1312 {
  1313     int i, j;
  1314 
  1315     if (!_this) {
  1316         return;
  1317     }
  1318     /* Restore video mode, etc. */
  1319     SDL_SendWindowEvent(windowID, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
  1320 
  1321     for (i = 0; i < _this->num_displays; ++i) {
  1322         SDL_VideoDisplay *display = &_this->displays[i];
  1323         for (j = 0; j < display->num_windows; ++j) {
  1324             SDL_Window *window = &display->windows[j];
  1325             if (window->id != windowID) {
  1326                 continue;
  1327             }
  1328             if (window->title) {
  1329                 SDL_free(window->title);
  1330                 window->title = NULL;
  1331             }
  1332             if (window->renderer) {
  1333                 SDL_DestroyRenderer(window->id);
  1334                 window->renderer = NULL;
  1335             }
  1336             if (_this->DestroyWindow) {
  1337                 _this->DestroyWindow(_this, window);
  1338             }
  1339             if (j != display->num_windows - 1) {
  1340                 SDL_memcpy(&display->windows[i],
  1341                            &display->windows[i + 1],
  1342                            (display->num_windows - i - 1) * sizeof(*window));
  1343             }
  1344             --display->num_windows;
  1345             return;
  1346         }
  1347     }
  1348 }
  1349 
  1350 void
  1351 SDL_AddRenderDriver(int displayIndex, const SDL_RenderDriver * driver)
  1352 {
  1353     SDL_VideoDisplay *display;
  1354     SDL_RenderDriver *render_drivers;
  1355 
  1356     if (displayIndex >= _this->num_displays) {
  1357         return;
  1358     }
  1359     display = &_this->displays[displayIndex];
  1360 
  1361     render_drivers =
  1362         SDL_realloc(display->render_drivers,
  1363                     (display->num_render_drivers +
  1364                      1) * sizeof(*render_drivers));
  1365     if (render_drivers) {
  1366         render_drivers[display->num_render_drivers] = *driver;
  1367         display->render_drivers = render_drivers;
  1368         display->num_render_drivers++;
  1369     }
  1370 }
  1371 
  1372 int
  1373 SDL_GetNumRenderDrivers(void)
  1374 {
  1375     if (_this) {
  1376         return SDL_CurrentDisplay.num_render_drivers;
  1377     }
  1378     return 0;
  1379 }
  1380 
  1381 int
  1382 SDL_GetRenderDriverInfo(int index, SDL_RendererInfo * info)
  1383 {
  1384     if (!_this) {
  1385         SDL_UninitializedVideo();
  1386         return -1;
  1387     }
  1388     if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
  1389         SDL_SetError("index must be in the range of 0 - %d",
  1390                      SDL_GetNumRenderDrivers() - 1);
  1391         return -1;
  1392     }
  1393     *info = SDL_CurrentDisplay.render_drivers[index].info;
  1394     return 0;
  1395 }
  1396 
  1397 int
  1398 SDL_CreateRenderer(SDL_WindowID windowID, int index, Uint32 flags)
  1399 {
  1400     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1401 
  1402     if (!window) {
  1403         return 0;
  1404     }
  1405     if (index < 0) {
  1406         const char *override = SDL_getenv("SDL_VIDEO_RENDERER");
  1407         int n = SDL_GetNumRenderDrivers();
  1408         for (index = 0; index < n; ++index) {
  1409             SDL_RenderDriver *driver =
  1410                 &SDL_CurrentDisplay.render_drivers[index];
  1411 
  1412             if (override) {
  1413                 if (SDL_strcasecmp(override, driver->info.name) == 0) {
  1414                     break;
  1415                 }
  1416             } else {
  1417                 if ((driver->info.flags & flags) == flags) {
  1418                     break;
  1419                 }
  1420             }
  1421         }
  1422         if (index == n) {
  1423             SDL_SetError("Couldn't find matching render driver");
  1424             return -1;
  1425         }
  1426     }
  1427     if (index >= SDL_GetNumRenderDrivers()) {
  1428         SDL_SetError("index must be -1 or in the range of 0 - %d",
  1429                      SDL_GetNumRenderDrivers() - 1);
  1430         return -1;
  1431     }
  1432     /* Free any existing renderer */
  1433     SDL_DestroyRenderer(windowID);
  1434 
  1435     /* Create a new renderer instance */
  1436     window->renderer = SDL_CurrentDisplay.render_drivers[index]
  1437         .CreateRenderer(window, flags);
  1438     SDL_SelectRenderer(window->id);
  1439 
  1440     return 0;
  1441 }
  1442 
  1443 int
  1444 SDL_SelectRenderer(SDL_WindowID windowID)
  1445 {
  1446     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1447     SDL_Renderer *renderer;
  1448 
  1449     if (!window || !window->renderer) {
  1450         return -1;
  1451     }
  1452     renderer = window->renderer;
  1453     if (renderer && renderer->ActivateRenderer) {
  1454         if (renderer->ActivateRenderer(renderer) < 0) {
  1455             return -1;
  1456         }
  1457     }
  1458     SDL_CurrentDisplay.current_renderer = renderer;
  1459     return 0;
  1460 }
  1461 
  1462 int
  1463 SDL_GetRendererInfo(SDL_RendererInfo * info)
  1464 {
  1465     if (!_this) {
  1466         SDL_UninitializedVideo();
  1467         return -1;
  1468     }
  1469     if (!SDL_CurrentDisplay.current_renderer) {
  1470         SDL_SetError("There is no current renderer");
  1471         return -1;
  1472     }
  1473     *info = SDL_CurrentDisplay.current_renderer->info;
  1474     return 0;
  1475 }
  1476 
  1477 SDL_TextureID
  1478 SDL_CreateTexture(Uint32 format, int access, int w, int h)
  1479 {
  1480     int hash;
  1481     SDL_Renderer *renderer;
  1482     SDL_Texture *texture;
  1483 
  1484     if (!_this) {
  1485         SDL_UninitializedVideo();
  1486         return 0;
  1487     }
  1488     renderer = SDL_CurrentDisplay.current_renderer;
  1489     if (!renderer) {
  1490         return 0;
  1491     }
  1492     if (!renderer->CreateTexture) {
  1493         SDL_Unsupported();
  1494         return 0;
  1495     }
  1496     texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
  1497     if (!texture) {
  1498         SDL_OutOfMemory();
  1499         return 0;
  1500     }
  1501     texture->id = _this->next_object_id++;
  1502     texture->format = format;
  1503     texture->access = access;
  1504     texture->w = w;
  1505     texture->h = h;
  1506     texture->r = 255;
  1507     texture->g = 255;
  1508     texture->b = 255;
  1509     texture->a = 255;
  1510     texture->renderer = renderer;
  1511 
  1512     if (renderer->CreateTexture(renderer, texture) < 0) {
  1513         if (renderer->DestroyTexture) {
  1514             renderer->DestroyTexture(renderer, texture);
  1515         }
  1516         SDL_free(texture);
  1517         return 0;
  1518     }
  1519     hash = (texture->id % SDL_arraysize(SDL_CurrentDisplay.textures));
  1520     texture->next = SDL_CurrentDisplay.textures[hash];
  1521     SDL_CurrentDisplay.textures[hash] = texture;
  1522 
  1523     return texture->id;
  1524 }
  1525 
  1526 SDL_TextureID
  1527 SDL_CreateTextureFromSurface(Uint32 format, SDL_Surface * surface)
  1528 {
  1529     SDL_TextureID textureID;
  1530     SDL_PixelFormat *fmt;
  1531     int bpp;
  1532     Uint32 Rmask, Gmask, Bmask, Amask;
  1533 
  1534     if (!surface) {
  1535         SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
  1536         return 0;
  1537     }
  1538     fmt = surface->format;
  1539 
  1540     if (format) {
  1541         if (!SDL_PixelFormatEnumToMasks
  1542             (format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
  1543             SDL_SetError("Unknown pixel format");
  1544             return 0;
  1545         }
  1546     } else {
  1547         if (surface->format->Amask
  1548             || !(surface->map->info.flags &
  1549                  (SDL_COPY_COLORKEY | SDL_COPY_MASK | SDL_COPY_BLEND))) {
  1550             bpp = fmt->BitsPerPixel;
  1551             Rmask = fmt->Rmask;
  1552             Gmask = fmt->Gmask;
  1553             Bmask = fmt->Bmask;
  1554             Amask = fmt->Amask;
  1555         } else {
  1556             /* Need a format with alpha */
  1557             bpp = 32;
  1558             Rmask = 0x00FF0000;
  1559             Gmask = 0x0000FF00;
  1560             Bmask = 0x000000FF;
  1561             Amask = 0xFF000000;
  1562         }
  1563         format = SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
  1564         if (!format) {
  1565             SDL_SetError("Unknown pixel format");
  1566             return 0;
  1567         }
  1568     }
  1569 
  1570     textureID =
  1571         SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1572                           surface->h);
  1573     if (!textureID) {
  1574         return 0;
  1575     }
  1576     if (bpp == fmt->BitsPerPixel && Rmask == fmt->Rmask && Gmask == fmt->Gmask
  1577         && Bmask == fmt->Bmask && Amask == fmt->Amask) {
  1578         if (SDL_MUSTLOCK(surface)) {
  1579             if (SDL_LockSurface(surface) < 0) {
  1580                 SDL_DestroyTexture(textureID);
  1581                 return 0;
  1582             }
  1583             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1584                               surface->pitch);
  1585             SDL_UnlockSurface(surface);
  1586         } else {
  1587             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1588                               surface->pitch);
  1589         }
  1590     } else {
  1591         SDL_PixelFormat *dst_fmt;
  1592         SDL_Surface *dst = NULL;
  1593 
  1594         /* Set up a destination surface for the texture update */
  1595         dst_fmt = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
  1596         if (dst_fmt) {
  1597             if (SDL_ISPIXELFORMAT_INDEXED(format)) {
  1598                 dst_fmt->palette =
  1599                     SDL_AllocPalette((1 << SDL_BITSPERPIXEL(format)));
  1600                 if (dst_fmt->palette) {
  1601                     /*
  1602                      * FIXME: Should we try to copy
  1603                      * fmt->palette?
  1604                      */
  1605                     SDL_DitherColors(dst_fmt->palette->colors,
  1606                                      SDL_BITSPERPIXEL(format));
  1607                 }
  1608             }
  1609             dst = SDL_ConvertSurface(surface, dst_fmt, 0);
  1610             if (dst) {
  1611                 SDL_UpdateTexture(textureID, NULL, dst->pixels, dst->pitch);
  1612                 SDL_FreeSurface(dst);
  1613             }
  1614             if (dst_fmt->palette) {
  1615                 SDL_FreePalette(dst_fmt->palette);
  1616             }
  1617             SDL_FreeFormat(dst_fmt);
  1618         }
  1619         if (!dst) {
  1620             SDL_DestroyTexture(textureID);
  1621             return 0;
  1622         }
  1623     }
  1624 
  1625     if (SDL_ISPIXELFORMAT_INDEXED(format) && fmt->palette) {
  1626         SDL_SetTexturePalette(textureID, fmt->palette->colors, 0,
  1627                               fmt->palette->ncolors);
  1628     }
  1629     return textureID;
  1630 }
  1631 
  1632 static __inline__ SDL_Texture *
  1633 SDL_GetTextureFromID(SDL_TextureID textureID)
  1634 {
  1635     int hash;
  1636     SDL_Texture *texture;
  1637 
  1638     if (!_this) {
  1639         return NULL;
  1640     }
  1641     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  1642     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  1643          texture = texture->next) {
  1644         if (texture->id == textureID) {
  1645             return texture;
  1646         }
  1647     }
  1648     return NULL;
  1649 }
  1650 
  1651 int
  1652 SDL_QueryTexture(SDL_TextureID textureID, Uint32 * format, int *access,
  1653                  int *w, int *h)
  1654 {
  1655     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1656 
  1657     if (!texture) {
  1658         return -1;
  1659     }
  1660     if (format) {
  1661         *format = texture->format;
  1662     }
  1663     if (access) {
  1664         *access = texture->access;
  1665     }
  1666     if (w) {
  1667         *w = texture->w;
  1668     }
  1669     if (h) {
  1670         *h = texture->h;
  1671     }
  1672     return 0;
  1673 }
  1674 
  1675 int
  1676 SDL_QueryTexturePixels(SDL_TextureID textureID, void **pixels, int *pitch)
  1677 {
  1678     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1679     SDL_Renderer *renderer;
  1680 
  1681     if (!texture) {
  1682         return -1;
  1683     }
  1684     renderer = texture->renderer;
  1685     if (!renderer->QueryTexturePixels) {
  1686         SDL_Unsupported();
  1687         return -1;
  1688     }
  1689     return renderer->QueryTexturePixels(renderer, texture, pixels, pitch);
  1690 }
  1691 
  1692 int
  1693 SDL_SetTexturePalette(SDL_TextureID textureID, const SDL_Color * colors,
  1694                       int firstcolor, int ncolors)
  1695 {
  1696     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1697     SDL_Renderer *renderer;
  1698 
  1699     if (!texture) {
  1700         return -1;
  1701     }
  1702     renderer = texture->renderer;
  1703     if (!renderer->SetTexturePalette) {
  1704         SDL_Unsupported();
  1705         return -1;
  1706     }
  1707     return renderer->SetTexturePalette(renderer, texture, colors, firstcolor,
  1708                                        ncolors);
  1709 }
  1710 
  1711 int
  1712 SDL_GetTexturePalette(SDL_TextureID textureID, SDL_Color * colors,
  1713                       int firstcolor, int ncolors)
  1714 {
  1715     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1716     SDL_Renderer *renderer;
  1717 
  1718     if (!texture) {
  1719         return -1;
  1720     }
  1721     renderer = texture->renderer;
  1722     if (!renderer->GetTexturePalette) {
  1723         SDL_Unsupported();
  1724         return -1;
  1725     }
  1726     return renderer->GetTexturePalette(renderer, texture, colors, firstcolor,
  1727                                        ncolors);
  1728 }
  1729 
  1730 int
  1731 SDL_SetTextureColorMod(SDL_TextureID textureID, Uint8 r, Uint8 g, Uint8 b)
  1732 {
  1733     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1734     SDL_Renderer *renderer;
  1735 
  1736     if (!texture) {
  1737         return -1;
  1738     }
  1739     renderer = texture->renderer;
  1740     if (!renderer->SetTextureColorMod) {
  1741         SDL_Unsupported();
  1742         return -1;
  1743     }
  1744     if (r < 255 || g < 255 || b < 255) {
  1745         texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
  1746     } else {
  1747         texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
  1748     }
  1749     texture->r = r;
  1750     texture->g = g;
  1751     texture->b = b;
  1752     return renderer->SetTextureColorMod(renderer, texture);
  1753 }
  1754 
  1755 int
  1756 SDL_GetTextureColorMod(SDL_TextureID textureID, Uint8 * r, Uint8 * g,
  1757                        Uint8 * b)
  1758 {
  1759     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1760     SDL_Renderer *renderer;
  1761 
  1762     if (!texture) {
  1763         return -1;
  1764     }
  1765     renderer = texture->renderer;
  1766     if (r) {
  1767         *r = texture->r;
  1768     }
  1769     if (g) {
  1770         *g = texture->g;
  1771     }
  1772     if (b) {
  1773         *b = texture->b;
  1774     }
  1775     return 0;
  1776 }
  1777 
  1778 int
  1779 SDL_SetTextureAlphaMod(SDL_TextureID textureID, Uint8 alpha)
  1780 {
  1781     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1782     SDL_Renderer *renderer;
  1783 
  1784     if (!texture) {
  1785         return -1;
  1786     }
  1787     renderer = texture->renderer;
  1788     if (!renderer->SetTextureAlphaMod) {
  1789         SDL_Unsupported();
  1790         return -1;
  1791     }
  1792     if (alpha < 255) {
  1793         texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
  1794     } else {
  1795         texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
  1796     }
  1797     texture->a = alpha;
  1798     return renderer->SetTextureAlphaMod(renderer, texture);
  1799 }
  1800 
  1801 int
  1802 SDL_GetTextureAlphaMod(SDL_TextureID textureID, Uint8 * alpha)
  1803 {
  1804     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1805 
  1806     if (!texture) {
  1807         return -1;
  1808     }
  1809     if (alpha) {
  1810         *alpha = texture->a;
  1811     }
  1812     return 0;
  1813 }
  1814 
  1815 int
  1816 SDL_SetTextureBlendMode(SDL_TextureID textureID, int blendMode)
  1817 {
  1818     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1819     SDL_Renderer *renderer;
  1820 
  1821     if (!texture) {
  1822         return -1;
  1823     }
  1824     renderer = texture->renderer;
  1825     if (!renderer->SetTextureBlendMode) {
  1826         SDL_Unsupported();
  1827         return -1;
  1828     }
  1829     texture->blendMode = blendMode;
  1830     return renderer->SetTextureBlendMode(renderer, texture);
  1831 }
  1832 
  1833 int
  1834 SDL_GetTextureBlendMode(SDL_TextureID textureID, int *blendMode)
  1835 {
  1836     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1837 
  1838     if (!texture) {
  1839         return -1;
  1840     }
  1841     if (blendMode) {
  1842         *blendMode = texture->blendMode;
  1843     }
  1844     return 0;
  1845 }
  1846 
  1847 int
  1848 SDL_SetTextureScaleMode(SDL_TextureID textureID, int scaleMode)
  1849 {
  1850     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1851     SDL_Renderer *renderer;
  1852 
  1853     if (!texture) {
  1854         return -1;
  1855     }
  1856     renderer = texture->renderer;
  1857     if (!renderer->SetTextureScaleMode) {
  1858         SDL_Unsupported();
  1859         return -1;
  1860     }
  1861     texture->scaleMode = scaleMode;
  1862     return renderer->SetTextureScaleMode(renderer, texture);
  1863 }
  1864 
  1865 int
  1866 SDL_GetTextureScaleMode(SDL_TextureID textureID, int *scaleMode)
  1867 {
  1868     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1869 
  1870     if (!texture) {
  1871         return -1;
  1872     }
  1873     if (scaleMode) {
  1874         *scaleMode = texture->scaleMode;
  1875     }
  1876     return 0;
  1877 }
  1878 
  1879 int
  1880 SDL_UpdateTexture(SDL_TextureID textureID, const SDL_Rect * rect,
  1881                   const void *pixels, int pitch)
  1882 {
  1883     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1884     SDL_Renderer *renderer;
  1885     SDL_Rect full_rect;
  1886 
  1887     if (!texture) {
  1888         return -1;
  1889     }
  1890     renderer = texture->renderer;
  1891     if (!renderer->UpdateTexture) {
  1892         SDL_Unsupported();
  1893         return -1;
  1894     }
  1895     if (!rect) {
  1896         full_rect.x = 0;
  1897         full_rect.y = 0;
  1898         full_rect.w = texture->w;
  1899         full_rect.h = texture->h;
  1900         rect = &full_rect;
  1901     }
  1902     return renderer->UpdateTexture(renderer, texture, rect, pixels, pitch);
  1903 }
  1904 
  1905 int
  1906 SDL_LockTexture(SDL_TextureID textureID, const SDL_Rect * rect, int markDirty,
  1907                 void **pixels, int *pitch)
  1908 {
  1909     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1910     SDL_Renderer *renderer;
  1911     SDL_Rect full_rect;
  1912 
  1913     if (!texture) {
  1914         return -1;
  1915     }
  1916     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1917         SDL_SetError("SDL_LockTexture(): texture must be streaming");
  1918         return -1;
  1919     }
  1920     renderer = texture->renderer;
  1921     if (!renderer->LockTexture) {
  1922         SDL_Unsupported();
  1923         return -1;
  1924     }
  1925     if (!rect) {
  1926         full_rect.x = 0;
  1927         full_rect.y = 0;
  1928         full_rect.w = texture->w;
  1929         full_rect.h = texture->h;
  1930         rect = &full_rect;
  1931     }
  1932     return renderer->LockTexture(renderer, texture, rect, markDirty, pixels,
  1933                                  pitch);
  1934 }
  1935 
  1936 void
  1937 SDL_UnlockTexture(SDL_TextureID textureID)
  1938 {
  1939     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1940     SDL_Renderer *renderer;
  1941 
  1942     if (!texture) {
  1943         return;
  1944     }
  1945     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1946         return;
  1947     }
  1948     renderer = texture->renderer;
  1949     if (!renderer->UnlockTexture) {
  1950         return;
  1951     }
  1952     renderer->UnlockTexture(renderer, texture);
  1953 }
  1954 
  1955 void
  1956 SDL_DirtyTexture(SDL_TextureID textureID, int numrects,
  1957                  const SDL_Rect * rects)
  1958 {
  1959     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1960     SDL_Renderer *renderer;
  1961 
  1962     if (!texture) {
  1963         return;
  1964     }
  1965     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1966         return;
  1967     }
  1968     renderer = texture->renderer;
  1969     if (!renderer->DirtyTexture) {
  1970         return;
  1971     }
  1972     renderer->DirtyTexture(renderer, texture, numrects, rects);
  1973 }
  1974 
  1975 int
  1976 SDL_RenderFill(Uint8 r, Uint8 g, Uint8 b, Uint8 a, const SDL_Rect * rect)
  1977 {
  1978     SDL_Renderer *renderer;
  1979     SDL_Window *window;
  1980     SDL_Rect real_rect;
  1981 
  1982     if (!_this) {
  1983         SDL_UninitializedVideo();
  1984         return -1;
  1985     }
  1986     renderer = SDL_CurrentDisplay.current_renderer;
  1987     if (!renderer) {
  1988         return -1;
  1989     }
  1990     if (!renderer->RenderFill) {
  1991         SDL_Unsupported();
  1992         return -1;
  1993     }
  1994     window = SDL_GetWindowFromID(renderer->window);
  1995     real_rect.x = 0;
  1996     real_rect.y = 0;
  1997     real_rect.w = window->w;
  1998     real_rect.h = window->h;
  1999     if (rect) {
  2000         if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
  2001             return 0;
  2002         }
  2003     }
  2004     return renderer->RenderFill(renderer, r, g, b, a, &real_rect);
  2005 }
  2006 
  2007 int
  2008 SDL_RenderCopy(SDL_TextureID textureID, const SDL_Rect * srcrect,
  2009                const SDL_Rect * dstrect)
  2010 {
  2011     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2012     SDL_Renderer *renderer;
  2013     SDL_Window *window;
  2014     SDL_Rect real_srcrect;
  2015     SDL_Rect real_dstrect;
  2016 
  2017     if (!texture || texture->renderer != SDL_CurrentDisplay.current_renderer) {
  2018         return -1;
  2019     }
  2020     renderer = SDL_CurrentDisplay.current_renderer;
  2021     if (!renderer) {
  2022         return -1;
  2023     }
  2024     if (!renderer->RenderCopy) {
  2025         SDL_Unsupported();
  2026         return -1;
  2027     }
  2028     window = SDL_GetWindowFromID(renderer->window);
  2029     if (srcrect) {
  2030         real_srcrect = *srcrect;
  2031     } else {
  2032         real_srcrect.x = 0;
  2033         real_srcrect.y = 0;
  2034         real_srcrect.w = texture->w;
  2035         real_srcrect.h = texture->h;
  2036     }
  2037     if (dstrect) {
  2038         real_dstrect = *dstrect;
  2039     } else {
  2040         real_dstrect.x = 0;
  2041         real_dstrect.y = 0;
  2042         real_dstrect.w = window->w;
  2043         real_dstrect.h = window->h;
  2044     }
  2045 
  2046     return renderer->RenderCopy(renderer, texture, &real_srcrect,
  2047                                 &real_dstrect);
  2048 }
  2049 
  2050 void
  2051 SDL_RenderPresent(void)
  2052 {
  2053     SDL_Renderer *renderer;
  2054 
  2055     if (!_this) {
  2056         SDL_UninitializedVideo();
  2057         return;
  2058     }
  2059     renderer = SDL_CurrentDisplay.current_renderer;
  2060     if (!renderer || !renderer->RenderPresent) {
  2061         return;
  2062     }
  2063     renderer->RenderPresent(renderer);
  2064 }
  2065 
  2066 void
  2067 SDL_DestroyTexture(SDL_TextureID textureID)
  2068 {
  2069     int hash;
  2070     SDL_Texture *prev, *texture;
  2071     SDL_Renderer *renderer;
  2072 
  2073     if (!_this) {
  2074         SDL_UninitializedVideo();
  2075         return;
  2076     }
  2077     /* Look up the texture in the hash table */
  2078     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  2079     prev = NULL;
  2080     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  2081          prev = texture, texture = texture->next) {
  2082         if (texture->id == textureID) {
  2083             break;
  2084         }
  2085     }
  2086     if (!texture) {
  2087         return;
  2088     }
  2089     /* Unlink the texture from the list */
  2090     if (prev) {
  2091         prev->next = texture->next;
  2092     } else {
  2093         SDL_CurrentDisplay.textures[hash] = texture->next;
  2094     }
  2095 
  2096     /* Free the texture */
  2097     renderer = texture->renderer;
  2098     renderer->DestroyTexture(renderer, texture);
  2099     SDL_free(texture);
  2100 }
  2101 
  2102 void
  2103 SDL_DestroyRenderer(SDL_WindowID windowID)
  2104 {
  2105     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2106     SDL_Renderer *renderer;
  2107     int i;
  2108 
  2109     if (!window) {
  2110         return;
  2111     }
  2112     renderer = window->renderer;
  2113     if (!renderer) {
  2114         return;
  2115     }
  2116     /* Free existing textures for this renderer */
  2117     for (i = 0; i < SDL_arraysize(SDL_CurrentDisplay.textures); ++i) {
  2118         SDL_Texture *texture;
  2119         SDL_Texture *prev = NULL;
  2120         SDL_Texture *next;
  2121         for (texture = SDL_CurrentDisplay.textures[i]; texture;
  2122              texture = next) {
  2123             next = texture->next;
  2124             if (texture->renderer == renderer) {
  2125                 if (prev) {
  2126                     prev->next = next;
  2127                 } else {
  2128                     SDL_CurrentDisplay.textures[i] = next;
  2129                 }
  2130                 renderer->DestroyTexture(renderer, texture);
  2131                 SDL_free(texture);
  2132             } else {
  2133                 prev = texture;
  2134             }
  2135         }
  2136     }
  2137 
  2138     /* Free the renderer instance */
  2139     renderer->DestroyRenderer(renderer);
  2140 
  2141     /* Clear references */
  2142     window->renderer = NULL;
  2143     if (SDL_CurrentDisplay.current_renderer == renderer) {
  2144         SDL_CurrentDisplay.current_renderer = NULL;
  2145     }
  2146 }
  2147 
  2148 void
  2149 SDL_VideoQuit(void)
  2150 {
  2151     int i, j;
  2152 
  2153     if (!_this) {
  2154         return;
  2155     }
  2156     /* Halt event processing before doing anything else */
  2157     SDL_StopEventLoop();
  2158 
  2159     /* Clean up the system video */
  2160     for (i = _this->num_displays; i--;) {
  2161         SDL_VideoDisplay *display = &_this->displays[i];
  2162         for (j = display->num_windows; j--;) {
  2163             SDL_DestroyWindow(display->windows[i].id);
  2164         }
  2165         if (display->windows) {
  2166             SDL_free(display->windows);
  2167             display->windows = NULL;
  2168         }
  2169         display->num_windows = 0;
  2170         if (display->render_drivers) {
  2171             SDL_free(display->render_drivers);
  2172             display->render_drivers = NULL;
  2173         }
  2174         display->num_render_drivers = 0;
  2175     }
  2176     _this->VideoQuit(_this);
  2177 
  2178     for (i = _this->num_displays; i--;) {
  2179         SDL_VideoDisplay *display = &_this->displays[i];
  2180         for (j = display->num_display_modes; j--;) {
  2181             if (display->display_modes[j].driverdata) {
  2182                 SDL_free(display->display_modes[j].driverdata);
  2183                 display->display_modes[j].driverdata = NULL;
  2184             }
  2185         }
  2186         if (display->display_modes) {
  2187             SDL_free(display->display_modes);
  2188             display->display_modes = NULL;
  2189         }
  2190         if (display->desktop_mode.driverdata) {
  2191             SDL_free(display->desktop_mode.driverdata);
  2192             display->desktop_mode.driverdata = NULL;
  2193         }
  2194         if (display->palette) {
  2195             SDL_FreePalette(display->palette);
  2196             display->palette = NULL;
  2197         }
  2198         if (display->gamma) {
  2199             SDL_free(display->gamma);
  2200             display->gamma = NULL;
  2201         }
  2202         if (display->driverdata) {
  2203             SDL_free(display->driverdata);
  2204             display->driverdata = NULL;
  2205         }
  2206     }
  2207     if (_this->displays) {
  2208         SDL_free(_this->displays);
  2209         _this->displays = NULL;
  2210     }
  2211     _this->free(_this);
  2212     _this = NULL;
  2213 }
  2214 
  2215 int
  2216 SDL_GL_LoadLibrary(const char *path)
  2217 {
  2218     int retval;
  2219 
  2220     if (!_this) {
  2221         SDL_UninitializedVideo();
  2222         return -1;
  2223     }
  2224     if (_this->GL_LoadLibrary) {
  2225         retval = _this->GL_LoadLibrary(_this, path);
  2226     } else {
  2227         SDL_SetError("No dynamic GL support in video driver");
  2228         retval = -1;
  2229     }
  2230     return (retval);
  2231 }
  2232 
  2233 void *
  2234 SDL_GL_GetProcAddress(const char *proc)
  2235 {
  2236     void *func;
  2237 
  2238     if (!_this) {
  2239         SDL_UninitializedVideo();
  2240         return NULL;
  2241     }
  2242     func = NULL;
  2243     if (_this->GL_GetProcAddress) {
  2244         if (_this->gl_config.driver_loaded) {
  2245             func = _this->GL_GetProcAddress(_this, proc);
  2246         } else {
  2247             SDL_SetError("No GL driver has been loaded");
  2248         }
  2249     } else {
  2250         SDL_SetError("No dynamic GL support in video driver");
  2251     }
  2252     return func;
  2253 }
  2254 
  2255 SDL_bool
  2256 SDL_GL_ExtensionSupported(const char *extension)
  2257 {
  2258 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2259     const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
  2260     const char *extensions;
  2261     const char *start;
  2262     const char *where, *terminator;
  2263 
  2264     /* Extension names should not have spaces. */
  2265     where = SDL_strchr(extension, ' ');
  2266     if (where || *extension == '\0') {
  2267         return SDL_FALSE;
  2268     }
  2269     /* See if there's an environment variable override */
  2270     start = SDL_getenv(extension);
  2271     if (start && *start == '0') {
  2272         return SDL_FALSE;
  2273     }
  2274     /* Lookup the available extensions */
  2275     glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
  2276     if (glGetStringFunc) {
  2277         extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
  2278     } else {
  2279         extensions = NULL;
  2280     }
  2281     if (!extensions) {
  2282         return SDL_FALSE;
  2283     }
  2284     /*
  2285      * It takes a bit of care to be fool-proof about parsing the OpenGL
  2286      * extensions string. Don't be fooled by sub-strings, etc.
  2287      */
  2288 
  2289     start = extensions;
  2290 
  2291     for (;;) {
  2292         where = SDL_strstr(start, extension);
  2293         if (!where)
  2294             break;
  2295 
  2296         terminator = where + SDL_strlen(extension);
  2297         if (where == start || *(where - 1) == ' ')
  2298             if (*terminator == ' ' || *terminator == '\0')
  2299                 return SDL_TRUE;
  2300 
  2301         start = terminator;
  2302     }
  2303     return SDL_FALSE;
  2304 #else
  2305     return SDL_FALSE;
  2306 #endif
  2307 }
  2308 
  2309 int
  2310 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
  2311 {
  2312 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2313     int retval;
  2314 
  2315     if (!_this) {
  2316         SDL_UninitializedVideo();
  2317         return -1;
  2318     }
  2319     retval = 0;
  2320     switch (attr) {
  2321     case SDL_GL_RED_SIZE:
  2322         _this->gl_config.red_size = value;
  2323         break;
  2324     case SDL_GL_GREEN_SIZE:
  2325         _this->gl_config.green_size = value;
  2326         break;
  2327     case SDL_GL_BLUE_SIZE:
  2328         _this->gl_config.blue_size = value;
  2329         break;
  2330     case SDL_GL_ALPHA_SIZE:
  2331         _this->gl_config.alpha_size = value;
  2332         break;
  2333     case SDL_GL_DOUBLEBUFFER:
  2334         _this->gl_config.double_buffer = value;
  2335         break;
  2336     case SDL_GL_BUFFER_SIZE:
  2337         _this->gl_config.buffer_size = value;
  2338         break;
  2339     case SDL_GL_DEPTH_SIZE:
  2340         _this->gl_config.depth_size = value;
  2341         break;
  2342     case SDL_GL_STENCIL_SIZE:
  2343         _this->gl_config.stencil_size = value;
  2344         break;
  2345     case SDL_GL_ACCUM_RED_SIZE:
  2346         _this->gl_config.accum_red_size = value;
  2347         break;
  2348     case SDL_GL_ACCUM_GREEN_SIZE:
  2349         _this->gl_config.accum_green_size = value;
  2350         break;
  2351     case SDL_GL_ACCUM_BLUE_SIZE:
  2352         _this->gl_config.accum_blue_size = value;
  2353         break;
  2354     case SDL_GL_ACCUM_ALPHA_SIZE:
  2355         _this->gl_config.accum_alpha_size = value;
  2356         break;
  2357     case SDL_GL_STEREO:
  2358         _this->gl_config.stereo = value;
  2359         break;
  2360     case SDL_GL_MULTISAMPLEBUFFERS:
  2361         _this->gl_config.multisamplebuffers = value;
  2362         break;
  2363     case SDL_GL_MULTISAMPLESAMPLES:
  2364         _this->gl_config.multisamplesamples = value;
  2365         break;
  2366     case SDL_GL_ACCELERATED_VISUAL:
  2367         _this->gl_config.accelerated = value;
  2368         break;
  2369     case SDL_GL_RETAINED_BACKING:
  2370         _this->gl_config.retained_backing = value;
  2371         break;
  2372     default:
  2373         SDL_SetError("Unknown OpenGL attribute");
  2374         retval = -1;
  2375         break;
  2376     }
  2377     return retval;
  2378 #else
  2379     SDL_Unsupported();
  2380     return -1;
  2381 #endif /* SDL_VIDEO_OPENGL */
  2382 }
  2383 
  2384 int
  2385 SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
  2386 {
  2387 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2388     void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2389     GLenum attrib = 0;
  2390 
  2391     glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2392     if (!glGetIntegervFunc) {
  2393         return -1;
  2394     }
  2395     switch (attr) {
  2396     case SDL_GL_RETAINED_BACKING:
  2397         *value = _this->gl_config.retained_backing;
  2398         return 0;
  2399     case SDL_GL_RED_SIZE:
  2400         attrib = GL_RED_BITS;
  2401         break;
  2402     case SDL_GL_BLUE_SIZE:
  2403         attrib = GL_BLUE_BITS;
  2404         break;
  2405     case SDL_GL_GREEN_SIZE:
  2406         attrib = GL_GREEN_BITS;
  2407         break;
  2408     case SDL_GL_ALPHA_SIZE:
  2409         attrib = GL_ALPHA_BITS;
  2410         break;
  2411     case SDL_GL_DOUBLEBUFFER:
  2412 #ifndef SDL_VIDEO_OPENGL_ES
  2413         attrib = GL_DOUBLEBUFFER;
  2414         break;
  2415 #else
  2416         /*
  2417          * I believe double buffering is the only option in OpenGL ES
  2418          * -- in any case, GL_DOUBLEBUFFER doesn't exist
  2419          */
  2420         *value = 1;
  2421         return 0;
  2422 #endif
  2423     case SDL_GL_DEPTH_SIZE:
  2424         attrib = GL_DEPTH_BITS;
  2425         break;
  2426     case SDL_GL_STENCIL_SIZE:
  2427         attrib = GL_STENCIL_BITS;
  2428         break;
  2429 #ifndef SDL_VIDEO_OPENGL_ES
  2430     case SDL_GL_ACCUM_RED_SIZE:
  2431         attrib = GL_ACCUM_RED_BITS;
  2432         break;
  2433     case SDL_GL_ACCUM_GREEN_SIZE:
  2434         attrib = GL_ACCUM_GREEN_BITS;
  2435         break;
  2436     case SDL_GL_ACCUM_BLUE_SIZE:
  2437         attrib = GL_ACCUM_BLUE_BITS;
  2438         break;
  2439     case SDL_GL_ACCUM_ALPHA_SIZE:
  2440         attrib = GL_ACCUM_ALPHA_BITS;
  2441         break;
  2442     case SDL_GL_STEREO:
  2443         attrib = GL_STEREO;
  2444         break;
  2445 #else
  2446     case SDL_GL_ACCUM_RED_SIZE:
  2447     case SDL_GL_ACCUM_GREEN_SIZE:
  2448     case SDL_GL_ACCUM_BLUE_SIZE:
  2449     case SDL_GL_ACCUM_ALPHA_SIZE:
  2450     case SDL_GL_STEREO:
  2451         /* none of these are supported in OpenGL ES */
  2452         *value = 0;
  2453         return 0;
  2454 #endif
  2455     case SDL_GL_MULTISAMPLEBUFFERS:
  2456 #ifndef SDL_VIDEO_OPENGL_ES
  2457         attrib = GL_SAMPLE_BUFFERS_ARB;
  2458 #else
  2459         attrib = GL_SAMPLE_BUFFERS;
  2460 #endif
  2461         break;
  2462     case SDL_GL_MULTISAMPLESAMPLES:
  2463 #ifndef SDL_VIDEO_OPENGL_ES
  2464         attrib = GL_SAMPLES_ARB;
  2465 #else
  2466         attrib = GL_SAMPLES;
  2467 #endif
  2468         break;
  2469     case SDL_GL_BUFFER_SIZE:
  2470         {
  2471             GLint bits = 0;
  2472             GLint component;
  2473 
  2474             /*
  2475              * there doesn't seem to be a single flag in OpenGL
  2476              * for this!
  2477              */
  2478             glGetIntegervFunc(GL_RED_BITS, &component);
  2479             bits += component;
  2480             glGetIntegervFunc(GL_GREEN_BITS, &component);
  2481             bits += component;
  2482             glGetIntegervFunc(GL_BLUE_BITS, &component);
  2483             bits += component;
  2484             glGetIntegervFunc(GL_ALPHA_BITS, &component);
  2485             bits += component;
  2486 
  2487             *value = bits;
  2488             return 0;
  2489         }
  2490     case SDL_GL_ACCELERATED_VISUAL:
  2491         {
  2492             /* FIXME: How do we get this information? */
  2493             *value = (_this->gl_config.accelerated != 0);
  2494             return 0;
  2495         }
  2496     default:
  2497         SDL_SetError("Unknown OpenGL attribute");
  2498         return -1;
  2499     }
  2500 
  2501     glGetIntegervFunc(attrib, (GLint *) value);
  2502     return 0;
  2503 #else
  2504     SDL_Unsupported();
  2505     return -1;
  2506 #endif /* SDL_VIDEO_OPENGL */
  2507 }
  2508 
  2509 SDL_GLContext
  2510 SDL_GL_CreateContext(SDL_WindowID windowID)
  2511 {
  2512     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2513 
  2514     if (!window) {
  2515         return NULL;
  2516     }
  2517     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2518         SDL_SetError("The specified window isn't an OpenGL window");
  2519         return NULL;
  2520     }
  2521     return _this->GL_CreateContext(_this, window);
  2522 }
  2523 
  2524 int
  2525 SDL_GL_MakeCurrent(SDL_WindowID windowID, SDL_GLContext context)
  2526 {
  2527     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2528 
  2529     if (window && !(window->flags & SDL_WINDOW_OPENGL)) {
  2530         SDL_SetError("The specified window isn't an OpenGL window");
  2531         return -1;
  2532     }
  2533     if (!context) {
  2534         window = NULL;
  2535     }
  2536     return _this->GL_MakeCurrent(_this, window, context);
  2537 }
  2538 
  2539 int
  2540 SDL_GL_SetSwapInterval(int interval)
  2541 {
  2542     if (!_this) {
  2543         SDL_UninitializedVideo();
  2544         return -1;
  2545     }
  2546     if (_this->GL_SetSwapInterval) {
  2547         return _this->GL_SetSwapInterval(_this, interval);
  2548     } else {
  2549         SDL_SetError("Setting the swap interval is not supported");
  2550         return -1;
  2551     }
  2552 }
  2553 
  2554 int
  2555 SDL_GL_GetSwapInterval(void)
  2556 {
  2557     if (!_this) {
  2558         SDL_UninitializedVideo();
  2559         return -1;
  2560     }
  2561     if (_this->GL_GetSwapInterval) {
  2562         return _this->GL_GetSwapInterval(_this);
  2563     } else {
  2564         SDL_SetError("Getting the swap interval is not supported");
  2565         return -1;
  2566     }
  2567 }
  2568 
  2569 void
  2570 SDL_GL_SwapWindow(SDL_WindowID windowID)
  2571 {
  2572     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2573 
  2574     if (!window) {
  2575         return;
  2576     }
  2577     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2578         SDL_SetError("The specified window isn't an OpenGL window");
  2579         return;
  2580     }
  2581     _this->GL_SwapWindow(_this, window);
  2582 }
  2583 
  2584 void
  2585 SDL_GL_DeleteContext(SDL_GLContext context)
  2586 {
  2587     if (!_this || !context) {
  2588         return;
  2589     }
  2590     _this->GL_MakeCurrent(_this, NULL, NULL);
  2591     _this->GL_DeleteContext(_this, context);
  2592 }
  2593 
  2594 #if 0                           // FIXME
  2595 /*
  2596  * Utility function used by SDL_WM_SetIcon(); flags & 1 for color key, flags
  2597  * & 2 for alpha channel.
  2598  */
  2599 static void
  2600 CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
  2601 {
  2602     int x, y;
  2603     Uint32 colorkey;
  2604 #define SET_MASKBIT(icon, x, y, mask) \
  2605 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  2606 
  2607     colorkey = icon->format->colorkey;
  2608     switch (icon->format->BytesPerPixel) {
  2609     case 1:
  2610         {
  2611             Uint8 *pixels;
  2612             for (y = 0; y < icon->h; ++y) {
  2613                 pixels = (Uint8 *) icon->pixels + y * icon->pitch;
  2614                 for (x = 0; x < icon->w; ++x) {
  2615                     if (*pixels++ == colorkey) {
  2616                         SET_MASKBIT(icon, x, y, mask);
  2617                     }
  2618                 }
  2619             }
  2620         }
  2621         break;
  2622 
  2623     case 2:
  2624         {
  2625             Uint16 *pixels;
  2626             for (y = 0; y < icon->h; ++y) {
  2627                 pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
  2628                 for (x = 0; x < icon->w; ++x) {
  2629                     if ((flags & 1) && *pixels == colorkey) {
  2630                         SET_MASKBIT(icon, x, y, mask);
  2631                     } else if ((flags & 2)
  2632                                && (*pixels & icon->format->Amask) == 0) {
  2633                         SET_MASKBIT(icon, x, y, mask);
  2634                     }
  2635                     pixels++;
  2636                 }
  2637             }
  2638         }
  2639         break;
  2640 
  2641     case 4:
  2642         {
  2643             Uint32 *pixels;
  2644             for (y = 0; y < icon->h; ++y) {
  2645                 pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
  2646                 for (x = 0; x < icon->w; ++x) {
  2647                     if ((flags & 1) && *pixels == colorkey) {
  2648                         SET_MASKBIT(icon, x, y, mask);
  2649                     } else if ((flags & 2)
  2650                                && (*pixels & icon->format->Amask) == 0) {
  2651                         SET_MASKBIT(icon, x, y, mask);
  2652                     }
  2653                     pixels++;
  2654                 }
  2655             }
  2656         }
  2657         break;
  2658     }
  2659 }
  2660 
  2661 /*
  2662  * Sets the window manager icon for the display window.
  2663  */
  2664 void
  2665 SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
  2666 {
  2667     if (icon && _this->SetIcon) {
  2668         /* Generate a mask if necessary, and create the icon! */
  2669         if (mask == NULL) {
  2670             int mask_len = icon->h * (icon->w + 7) / 8;
  2671             int flags = 0;
  2672             mask = (Uint8 *) SDL_malloc(mask_len);
  2673             if (mask == NULL) {
  2674                 return;
  2675             }
  2676             SDL_memset(mask, ~0, mask_len);
  2677             if (icon->flags & SDL_SRCCOLORKEY)
  2678                 flags |= 1;
  2679             if (icon->flags & SDL_SRCALPHA)
  2680                 flags |= 2;
  2681             if (flags) {
  2682                 CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  2683             }
  2684             _this->SetIcon(_this, icon, mask);
  2685             SDL_free(mask);
  2686         } else {
  2687             _this->SetIcon(_this, icon, mask);
  2688         }
  2689     }
  2690 }
  2691 #endif
  2692 
  2693 SDL_bool
  2694 SDL_GetWindowWMInfo(SDL_WindowID windowID, struct SDL_SysWMinfo *info)
  2695 {
  2696     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2697 
  2698     if (!window || !_this->GetWindowWMInfo) {
  2699         return SDL_FALSE;
  2700     }
  2701     return (_this->GetWindowWMInfo(_this, window, info));
  2702 }
  2703 
  2704 /* vi: set ts=4 sw=4 expandtab: */