src/video/SDL_video.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 09 Feb 2009 05:32:12 +0000
changeset 3057 089a77aebb7d
parent 3053 aa34d1180d30
child 3058 17c5930f498e
permissions -rw-r--r--
Added test program for SDL_CreateWindowFrom()
Make sure OpenGL library is loaded before working with OpenGL windows,
even those created with SDL_CreateWindowFrom()
     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_video.h"
    28 #include "SDL_sysvideo.h"
    29 #include "SDL_blit.h"
    30 #include "SDL_pixels_c.h"
    31 #include "SDL_renderer_gl.h"
    32 #include "SDL_renderer_gles.h"
    33 #include "SDL_renderer_sw.h"
    34 #include "../events/SDL_sysevents.h"
    35 #include "../events/SDL_events_c.h"
    36 
    37 #if SDL_VIDEO_OPENGL_ES
    38 #include "SDL_opengles.h"
    39 #endif /* SDL_VIDEO_OPENGL_ES */
    40 
    41 #if SDL_VIDEO_OPENGL
    42 #include "SDL_opengl.h"
    43 
    44 /* On Windows, windows.h defines CreateWindow */
    45 #ifdef CreateWindow
    46 #undef CreateWindow
    47 #endif
    48 #endif /* SDL_VIDEO_OPENGL */
    49 
    50 /* Available video drivers */
    51 static VideoBootStrap *bootstrap[] = {
    52 #if SDL_VIDEO_DRIVER_COCOA
    53     &COCOA_bootstrap,
    54 #endif
    55 #if SDL_VIDEO_DRIVER_X11
    56     &X11_bootstrap,
    57 #endif
    58 #if SDL_VIDEO_DRIVER_NANOX
    59     &NX_bootstrap,
    60 #endif
    61 #if SDL_VIDEO_DRIVER_IPOD
    62     &iPod_bootstrap,
    63 #endif
    64 #if SDL_VIDEO_DRIVER_WSCONS
    65     &WSCONS_bootstrap,
    66 #endif
    67 #if SDL_VIDEO_DRIVER_FBCON
    68     &FBCON_bootstrap,
    69 #endif
    70 #if SDL_VIDEO_DRIVER_DIRECTFB
    71     &DirectFB_bootstrap,
    72 #endif
    73 #if SDL_VIDEO_DRIVER_PS2GS
    74     &PS2GS_bootstrap,
    75 #endif
    76 #if SDL_VIDEO_DRIVER_VGL
    77     &VGL_bootstrap,
    78 #endif
    79 #if SDL_VIDEO_DRIVER_SVGALIB
    80     &SVGALIB_bootstrap,
    81 #endif
    82 #if SDL_VIDEO_DRIVER_GAPI
    83     &GAPI_bootstrap,
    84 #endif
    85 #if SDL_VIDEO_DRIVER_WIN32
    86     &WIN32_bootstrap,
    87 #endif
    88 #if SDL_VIDEO_DRIVER_BWINDOW
    89     &BWINDOW_bootstrap,
    90 #endif
    91 #if SDL_VIDEO_DRIVER_PHOTON
    92     &ph_bootstrap,
    93 #endif
    94 #if SDL_VIDEO_DRIVER_EPOC
    95     &EPOC_bootstrap,
    96 #endif
    97 #if SDL_VIDEO_DRIVER_XBIOS
    98     &XBIOS_bootstrap,
    99 #endif
   100 #if SDL_VIDEO_DRIVER_GEM
   101     &GEM_bootstrap,
   102 #endif
   103 #if SDL_VIDEO_DRIVER_DC
   104     &DC_bootstrap,
   105 #endif
   106 #if SDL_VIDEO_DRIVER_RISCOS
   107     &RISCOS_bootstrap,
   108 #endif
   109 #if SDL_VIDEO_DRIVER_OS2FS
   110     &OS2FSLib_bootstrap,
   111 #endif
   112 #if SDL_VIDEO_DRIVER_NDS
   113     &NDS_bootstrap,
   114 #endif
   115 #if SDL_VIDEO_DRIVER_UIKIT
   116     &UIKIT_bootstrap,
   117 #endif
   118 #if SDL_VIDEO_DRIVER_DUMMY
   119     &DUMMY_bootstrap,
   120 #endif
   121     NULL
   122 };
   123 
   124 static SDL_VideoDevice *_this = NULL;
   125 
   126 /* Various local functions */
   127 static void SDL_UpdateWindowGrab(SDL_Window * window);
   128 
   129 static int
   130 cmpmodes(const void *A, const void *B)
   131 {
   132     SDL_DisplayMode a = *(const SDL_DisplayMode *) A;
   133     SDL_DisplayMode b = *(const SDL_DisplayMode *) B;
   134 
   135     if (a.w != b.w) {
   136         return b.w - a.w;
   137     }
   138     if (a.h != b.h) {
   139         return b.h - a.h;
   140     }
   141     if (SDL_BITSPERPIXEL(a.format) != SDL_BITSPERPIXEL(b.format)) {
   142         return SDL_BITSPERPIXEL(b.format) - SDL_BITSPERPIXEL(a.format);
   143     }
   144     if (a.refresh_rate != b.refresh_rate) {
   145         return b.refresh_rate - a.refresh_rate;
   146     }
   147     return 0;
   148 }
   149 
   150 static void
   151 SDL_UninitializedVideo()
   152 {
   153     SDL_SetError("Video subsystem has not been initialized");
   154 }
   155 
   156 int
   157 SDL_GetNumVideoDrivers(void)
   158 {
   159     return SDL_arraysize(bootstrap) - 1;
   160 }
   161 
   162 const char *
   163 SDL_GetVideoDriver(int index)
   164 {
   165     if (index >= 0 && index < SDL_GetNumVideoDrivers()) {
   166         return bootstrap[index]->name;
   167     }
   168     return NULL;
   169 }
   170 
   171 /*
   172  * Initialize the video and event subsystems -- determine native pixel format
   173  */
   174 int
   175 SDL_VideoInit(const char *driver_name, Uint32 flags)
   176 {
   177     SDL_VideoDevice *video;
   178     int index;
   179     int i;
   180 
   181     /* Toggle the event thread flags, based on OS requirements */
   182 #if defined(MUST_THREAD_EVENTS)
   183     flags |= SDL_INIT_EVENTTHREAD;
   184 #elif defined(CANT_THREAD_EVENTS)
   185     if ((flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD) {
   186         SDL_SetError("OS doesn't support threaded events");
   187         return -1;
   188     }
   189 #endif
   190 
   191     /* Start the event loop */
   192     if (SDL_StartEventLoop(flags) < 0) {
   193         return -1;
   194     }
   195     /* Check to make sure we don't overwrite '_this' */
   196     if (_this != NULL) {
   197         SDL_VideoQuit();
   198     }
   199     /* Select the proper video driver */
   200     index = 0;
   201     video = NULL;
   202     if (driver_name == NULL) {
   203         driver_name = SDL_getenv("SDL_VIDEODRIVER");
   204     }
   205     if (driver_name != NULL) {
   206         for (i = 0; bootstrap[i]; ++i) {
   207             if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) {
   208                 if (bootstrap[i]->available()) {
   209                     video = bootstrap[i]->create(index);
   210                 }
   211                 break;
   212             }
   213         }
   214     } else {
   215         for (i = 0; bootstrap[i]; ++i) {
   216             if (bootstrap[i]->available()) {
   217                 video = bootstrap[i]->create(index);
   218                 if (video != NULL) {
   219                     break;
   220                 }
   221             }
   222         }
   223     }
   224     if (video == NULL) {
   225         if (driver_name) {
   226             SDL_SetError("%s not available", driver_name);
   227         } else {
   228             SDL_SetError("No available video device");
   229         }
   230         return -1;
   231     }
   232     _this = video;
   233     _this->name = bootstrap[i]->name;
   234     _this->next_object_id = 1;
   235 
   236 
   237     /* Set some very sane GL defaults */
   238     _this->gl_config.driver_loaded = 0;
   239     _this->gl_config.dll_handle = NULL;
   240     _this->gl_config.red_size = 3;
   241     _this->gl_config.green_size = 3;
   242     _this->gl_config.blue_size = 2;
   243     _this->gl_config.alpha_size = 0;
   244     _this->gl_config.buffer_size = 0;
   245     _this->gl_config.depth_size = 16;
   246     _this->gl_config.stencil_size = 0;
   247     _this->gl_config.double_buffer = 1;
   248     _this->gl_config.accum_red_size = 0;
   249     _this->gl_config.accum_green_size = 0;
   250     _this->gl_config.accum_blue_size = 0;
   251     _this->gl_config.accum_alpha_size = 0;
   252     _this->gl_config.stereo = 0;
   253     _this->gl_config.multisamplebuffers = 0;
   254     _this->gl_config.multisamplesamples = 0;
   255     _this->gl_config.retained_backing = 1;
   256     _this->gl_config.accelerated = -1;  /* not known, don't set */
   257 
   258     /* Initialize the video subsystem */
   259     if (_this->VideoInit(_this) < 0) {
   260         SDL_VideoQuit();
   261         return -1;
   262     }
   263     /* Make sure some displays were added */
   264     if (_this->num_displays == 0) {
   265         SDL_SetError("The video driver did not add any displays");
   266         SDL_VideoQuit();
   267         return (-1);
   268     }
   269     /* The software renderer is always available */
   270     for (i = 0; i < _this->num_displays; ++i) {
   271 #if SDL_VIDEO_RENDER_OGL
   272         SDL_AddRenderDriver(i, &GL_RenderDriver);
   273 #endif
   274 
   275 #if SDL_VIDEO_RENDER_OGL_ES
   276         SDL_AddRenderDriver(i, &GL_ES_RenderDriver);
   277 #endif
   278         if (_this->displays[i].num_render_drivers > 0) {
   279             SDL_AddRenderDriver(i, &SW_RenderDriver);
   280         }
   281     }
   282 
   283     /* We're ready to go! */
   284     return 0;
   285 }
   286 
   287 const char *
   288 SDL_GetCurrentVideoDriver()
   289 {
   290     if (!_this) {
   291         SDL_UninitializedVideo();
   292         return NULL;
   293     }
   294     return _this->name;
   295 }
   296 
   297 SDL_VideoDevice *
   298 SDL_GetVideoDevice()
   299 {
   300     return _this;
   301 }
   302 
   303 int
   304 SDL_AddBasicVideoDisplay(const SDL_DisplayMode * desktop_mode)
   305 {
   306     SDL_VideoDisplay display;
   307 
   308     SDL_zero(display);
   309     if (desktop_mode) {
   310         display.desktop_mode = *desktop_mode;
   311     }
   312     display.current_mode = display.desktop_mode;
   313 
   314     return SDL_AddVideoDisplay(&display);
   315 }
   316 
   317 int
   318 SDL_AddVideoDisplay(const SDL_VideoDisplay * display)
   319 {
   320     SDL_VideoDisplay *displays;
   321     int index = -1;
   322 
   323     displays =
   324         SDL_realloc(_this->displays,
   325                     (_this->num_displays + 1) * sizeof(*displays));
   326     if (displays) {
   327         index = _this->num_displays++;
   328         displays[index] = *display;
   329         displays[index].device = _this;
   330         _this->displays = displays;
   331     } else {
   332         SDL_OutOfMemory();
   333     }
   334     return index;
   335 }
   336 
   337 int
   338 SDL_GetNumVideoDisplays(void)
   339 {
   340     if (!_this) {
   341         SDL_UninitializedVideo();
   342         return 0;
   343     }
   344     return _this->num_displays;
   345 }
   346 
   347 int
   348 SDL_SelectVideoDisplay(int index)
   349 {
   350     if (!_this) {
   351         SDL_UninitializedVideo();
   352         return (-1);
   353     }
   354     if (index < 0 || index >= _this->num_displays) {
   355         SDL_SetError("index must be in the range 0 - %d",
   356                      _this->num_displays - 1);
   357         return -1;
   358     }
   359     _this->current_display = index;
   360     return 0;
   361 }
   362 
   363 int
   364 SDL_GetCurrentVideoDisplay(void)
   365 {
   366     if (!_this) {
   367         SDL_UninitializedVideo();
   368         return (-1);
   369     }
   370     return _this->current_display;
   371 }
   372 
   373 SDL_bool
   374 SDL_AddDisplayMode(int displayIndex, const SDL_DisplayMode * mode)
   375 {
   376     SDL_VideoDisplay *display = &_this->displays[displayIndex];
   377     SDL_DisplayMode *modes;
   378     int i, nmodes;
   379 
   380     /* Make sure we don't already have the mode in the list */
   381     modes = display->display_modes;
   382     nmodes = display->num_display_modes;
   383     for (i = nmodes; i--;) {
   384         if (SDL_memcmp(mode, &modes[i], sizeof(*mode)) == 0) {
   385             return SDL_FALSE;
   386         }
   387     }
   388 
   389     /* Go ahead and add the new mode */
   390     if (nmodes == display->max_display_modes) {
   391         modes =
   392             SDL_realloc(modes,
   393                         (display->max_display_modes + 32) * sizeof(*modes));
   394         if (!modes) {
   395             return SDL_FALSE;
   396         }
   397         display->display_modes = modes;
   398         display->max_display_modes += 32;
   399     }
   400     modes[nmodes] = *mode;
   401     display->num_display_modes++;
   402 
   403     return SDL_TRUE;
   404 }
   405 
   406 int
   407 SDL_GetNumDisplayModes()
   408 {
   409     if (_this) {
   410         SDL_VideoDisplay *display = &SDL_CurrentDisplay;
   411         if (!display->num_display_modes && _this->GetDisplayModes) {
   412             _this->GetDisplayModes(_this);
   413             SDL_qsort(display->display_modes, display->num_display_modes,
   414                       sizeof(SDL_DisplayMode), cmpmodes);
   415         }
   416         return display->num_display_modes;
   417     }
   418     return 0;
   419 }
   420 
   421 int
   422 SDL_GetDisplayMode(int index, SDL_DisplayMode * mode)
   423 {
   424     if (index < 0 || index >= SDL_GetNumDisplayModes()) {
   425         SDL_SetError("index must be in the range of 0 - %d",
   426                      SDL_GetNumDisplayModes() - 1);
   427         return -1;
   428     }
   429     if (mode) {
   430         *mode = SDL_CurrentDisplay.display_modes[index];
   431     }
   432     return 0;
   433 }
   434 
   435 int
   436 SDL_GetDesktopDisplayMode(SDL_DisplayMode * mode)
   437 {
   438     if (!_this) {
   439         SDL_UninitializedVideo();
   440         return -1;
   441     }
   442     if (mode) {
   443         *mode = SDL_CurrentDisplay.desktop_mode;
   444     }
   445     return 0;
   446 }
   447 
   448 int
   449 SDL_GetCurrentDisplayMode(SDL_DisplayMode * mode)
   450 {
   451     if (!_this) {
   452         SDL_UninitializedVideo();
   453         return -1;
   454     }
   455     if (mode) {
   456         *mode = SDL_CurrentDisplay.current_mode;
   457     }
   458     return 0;
   459 }
   460 
   461 SDL_DisplayMode *
   462 SDL_GetClosestDisplayMode(const SDL_DisplayMode * mode,
   463                           SDL_DisplayMode * closest)
   464 {
   465     Uint32 target_format;
   466     int target_refresh_rate;
   467     int i;
   468     SDL_DisplayMode *current, *match;
   469 
   470     if (!_this || !mode || !closest) {
   471         return NULL;
   472     }
   473     /* Default to the desktop format */
   474     if (mode->format) {
   475         target_format = mode->format;
   476     } else {
   477         target_format = SDL_CurrentDisplay.desktop_mode.format;
   478     }
   479 
   480     /* Default to the desktop refresh rate */
   481     if (mode->refresh_rate) {
   482         target_refresh_rate = mode->refresh_rate;
   483     } else {
   484         target_refresh_rate = SDL_CurrentDisplay.desktop_mode.refresh_rate;
   485     }
   486 
   487     match = NULL;
   488     for (i = 0; i < SDL_GetNumDisplayModes(); ++i) {
   489         current = &SDL_CurrentDisplay.display_modes[i];
   490 
   491         if (current->w && (current->w < mode->w)) {
   492             /* Out of sorted modes large enough here */
   493             break;
   494         }
   495         if (current->h && (current->h < mode->h)) {
   496             if (current->w && (current->w == mode->w)) {
   497                 /* Out of sorted modes large enough here */
   498                 break;
   499             }
   500             /* Wider, but not tall enough, due to a different
   501                aspect ratio. This mode must be skipped, but closer
   502                modes may still follow. */
   503             continue;
   504         }
   505         if (!match || current->w < match->w || current->h < match->h) {
   506             match = current;
   507             continue;
   508         }
   509         if (current->format != match->format) {
   510             /* Sorted highest depth to lowest */
   511             if (current->format == target_format ||
   512                 (SDL_BITSPERPIXEL(current->format) >=
   513                  SDL_BITSPERPIXEL(target_format)
   514                  && SDL_PIXELTYPE(current->format) ==
   515                  SDL_PIXELTYPE(target_format))) {
   516                 match = current;
   517             }
   518             continue;
   519         }
   520         if (current->refresh_rate != match->refresh_rate) {
   521             /* Sorted highest refresh to lowest */
   522             if (current->refresh_rate >= target_refresh_rate) {
   523                 match = current;
   524             }
   525         }
   526     }
   527     if (match) {
   528         if (match->format) {
   529             closest->format = match->format;
   530         } else {
   531             closest->format = mode->format;
   532         }
   533         if (match->w && match->h) {
   534             closest->w = match->w;
   535             closest->h = match->h;
   536         } else {
   537             closest->w = mode->w;
   538             closest->h = mode->h;
   539         }
   540         if (match->refresh_rate) {
   541             closest->refresh_rate = match->refresh_rate;
   542         } else {
   543             closest->refresh_rate = mode->refresh_rate;
   544         }
   545         closest->driverdata = match->driverdata;
   546 
   547         /*
   548          * Pick some reasonable defaults if the app and driver don't
   549          * care
   550          */
   551         if (!closest->format) {
   552             closest->format = SDL_PIXELFORMAT_RGB888;
   553         }
   554         if (!closest->w) {
   555             closest->w = 640;
   556         }
   557         if (!closest->h) {
   558             closest->h = 480;
   559         }
   560         return closest;
   561     }
   562     return NULL;
   563 }
   564 
   565 int
   566 SDL_SetDisplayMode(const SDL_DisplayMode * mode)
   567 {
   568     SDL_VideoDisplay *display;
   569     SDL_DisplayMode display_mode;
   570     SDL_DisplayMode current_mode;
   571     int i, ncolors;
   572 
   573     if (!_this) {
   574         SDL_UninitializedVideo();
   575         return -1;
   576     }
   577     display = &SDL_CurrentDisplay;
   578     if (!mode) {
   579         mode = &display->desktop_mode;
   580     }
   581     display_mode = *mode;
   582 
   583     /* Default to the current mode */
   584     if (!display_mode.format) {
   585         display_mode.format = display->current_mode.format;
   586     }
   587     if (!display_mode.w) {
   588         display_mode.w = display->current_mode.w;
   589     }
   590     if (!display_mode.h) {
   591         display_mode.h = display->current_mode.h;
   592     }
   593     if (!display_mode.refresh_rate) {
   594         display_mode.refresh_rate = display->current_mode.refresh_rate;
   595     }
   596     /* Get a good video mode, the closest one possible */
   597     if (!SDL_GetClosestDisplayMode(&display_mode, &display_mode)) {
   598         SDL_SetError("No video mode large enough for %dx%d",
   599                      display_mode.w, display_mode.h);
   600         return -1;
   601     }
   602     /* See if there's anything left to do */
   603     SDL_GetCurrentDisplayMode(&current_mode);
   604     if (SDL_memcmp(&display_mode, &current_mode, sizeof(display_mode)) == 0) {
   605         return 0;
   606     }
   607     /* Actually change the display mode */
   608     if (_this->SetDisplayMode(_this, &display_mode) < 0) {
   609         return -1;
   610     }
   611     display->current_mode = display_mode;
   612 
   613     /* Set up a palette, if necessary */
   614     if (SDL_ISPIXELFORMAT_INDEXED(display_mode.format)) {
   615         ncolors = (1 << SDL_BITSPERPIXEL(display_mode.format));
   616     } else {
   617         ncolors = 0;
   618     }
   619     if ((!ncolors && display->palette) || (ncolors && !display->palette)
   620         || (ncolors && ncolors != display->palette->ncolors)) {
   621         if (display->palette) {
   622             SDL_FreePalette(display->palette);
   623             display->palette = NULL;
   624         }
   625         if (ncolors) {
   626             display->palette = SDL_AllocPalette(ncolors);
   627             if (!display->palette) {
   628                 return -1;
   629             }
   630             SDL_DitherColors(display->palette->colors,
   631                              SDL_BITSPERPIXEL(display_mode.format));
   632         }
   633     }
   634     /* Move any fullscreen windows into position */
   635     for (i = 0; i < display->num_windows; ++i) {
   636         SDL_Window *window = &display->windows[i];
   637         if (FULLSCREEN_VISIBLE(window)) {
   638             SDL_SetWindowPosition(window->id, window->x, window->y);
   639         }
   640     }
   641 
   642     return 0;
   643 }
   644 
   645 int
   646 SDL_SetFullscreenDisplayMode(const SDL_DisplayMode * mode)
   647 {
   648     SDL_VideoDisplay *display;
   649     SDL_DisplayMode fullscreen_mode;
   650     int i;
   651 
   652     if (!_this) {
   653         SDL_UninitializedVideo();
   654         return -1;
   655     }
   656     display = &SDL_CurrentDisplay;
   657     if (!mode) {
   658         mode = &display->desktop_mode;
   659     }
   660     if (!SDL_GetClosestDisplayMode(mode, &fullscreen_mode)) {
   661         SDL_SetError("Couldn't find display mode match");
   662         return -1;
   663     }
   664     if (SDL_memcmp
   665         (&fullscreen_mode, &display->fullscreen_mode,
   666          sizeof(fullscreen_mode)) == 0) {
   667         /* Nothing to do... */
   668         return 0;
   669     }
   670     display->fullscreen_mode = fullscreen_mode;
   671 
   672     /* Actually set the mode if we have a fullscreen window visible */
   673     for (i = 0; i < display->num_windows; ++i) {
   674         SDL_Window *window = &display->windows[i];
   675         if (FULLSCREEN_VISIBLE(window)) {
   676             if (SDL_SetDisplayMode(&display->fullscreen_mode) < 0) {
   677                 return -1;
   678             }
   679         }
   680         if (window->flags & SDL_WINDOW_FULLSCREEN) {
   681             SDL_OnWindowResized(window);
   682         }
   683     }
   684     return 0;
   685 }
   686 
   687 int
   688 SDL_GetFullscreenDisplayMode(SDL_DisplayMode * mode)
   689 {
   690     if (!_this) {
   691         SDL_UninitializedVideo();
   692         return -1;
   693     }
   694     if (mode) {
   695         *mode = SDL_CurrentDisplay.fullscreen_mode;
   696     }
   697     return 0;
   698 }
   699 
   700 int
   701 SDL_SetDisplayPalette(const SDL_Color * colors, int firstcolor, int ncolors)
   702 {
   703     SDL_Palette *palette;
   704     int status = 0;
   705 
   706     if (!_this) {
   707         SDL_UninitializedVideo();
   708         return -1;
   709     }
   710     palette = SDL_CurrentDisplay.palette;
   711     if (!palette) {
   712         SDL_SetError("Display mode does not have a palette");
   713         return -1;
   714     }
   715     status = SDL_SetPaletteColors(palette, colors, firstcolor, ncolors);
   716 
   717     if (_this->SetDisplayPalette) {
   718         if (_this->SetDisplayPalette(_this, palette) < 0) {
   719             status = -1;
   720         }
   721     }
   722     return status;
   723 }
   724 
   725 int
   726 SDL_GetDisplayPalette(SDL_Color * colors, int firstcolor, int ncolors)
   727 {
   728     SDL_Palette *palette;
   729 
   730     if (!_this) {
   731         SDL_UninitializedVideo();
   732         return -1;
   733     }
   734     palette = SDL_CurrentDisplay.palette;
   735     if (!palette->ncolors) {
   736         SDL_SetError("Display mode does not have a palette");
   737         return -1;
   738     }
   739     if (firstcolor < 0 || (firstcolor + ncolors) > palette->ncolors) {
   740         SDL_SetError("Palette indices are out of range");
   741         return -1;
   742     }
   743     SDL_memcpy(colors, &palette->colors[firstcolor],
   744                ncolors * sizeof(*colors));
   745     return 0;
   746 }
   747 
   748 SDL_WindowID
   749 SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
   750 {
   751     const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
   752                                   SDL_WINDOW_OPENGL |
   753                                   SDL_WINDOW_BORDERLESS |
   754                                   SDL_WINDOW_RESIZABLE |
   755                                   SDL_WINDOW_INPUT_GRABBED);
   756     SDL_VideoDisplay *display;
   757     SDL_Window window;
   758     int num_windows;
   759     SDL_Window *windows;
   760 
   761     if (!_this) {
   762         SDL_UninitializedVideo();
   763         return 0;
   764     }
   765     if (flags & SDL_WINDOW_OPENGL) {
   766         if (!_this->GL_CreateContext) {
   767             SDL_SetError("No OpenGL support in video driver");
   768             return 0;
   769         }
   770         SDL_GL_LoadLibrary(NULL);
   771     }
   772     SDL_zero(window);
   773     window.id = _this->next_object_id++;
   774     window.x = x;
   775     window.y = y;
   776     window.w = w;
   777     window.h = h;
   778     window.flags = (flags & allowed_flags);
   779     window.display = _this->current_display;
   780 
   781     if (_this->CreateWindow && _this->CreateWindow(_this, &window) < 0) {
   782         if (flags & SDL_WINDOW_OPENGL) {
   783             SDL_GL_UnloadLibrary();
   784         }
   785         return 0;
   786     }
   787     display = &SDL_CurrentDisplay;
   788     num_windows = display->num_windows;
   789     windows =
   790         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   791     if (!windows) {
   792         if (_this->DestroyWindow) {
   793             _this->DestroyWindow(_this, &window);
   794         }
   795         if (flags & SDL_WINDOW_OPENGL) {
   796             SDL_GL_UnloadLibrary();
   797         }
   798         return 0;
   799     }
   800     windows[num_windows] = window;
   801     display->windows = windows;
   802     display->num_windows++;
   803 
   804     if (title) {
   805         SDL_SetWindowTitle(window.id, title);
   806     }
   807     if (flags & SDL_WINDOW_MAXIMIZED) {
   808         SDL_MaximizeWindow(window.id);
   809     }
   810     if (flags & SDL_WINDOW_MINIMIZED) {
   811         SDL_MinimizeWindow(window.id);
   812     }
   813     if (flags & SDL_WINDOW_SHOWN) {
   814         SDL_ShowWindow(window.id);
   815     }
   816     SDL_UpdateWindowGrab(&window);
   817 
   818     return window.id;
   819 }
   820 
   821 SDL_WindowID
   822 SDL_CreateWindowFrom(const void *data)
   823 {
   824     SDL_VideoDisplay *display;
   825     SDL_Window window;
   826     int num_windows;
   827     SDL_Window *windows;
   828 
   829     if (!_this) {
   830         SDL_UninitializedVideo();
   831         return (0);
   832     }
   833     SDL_zero(window);
   834     window.id = _this->next_object_id++;
   835     window.display = _this->current_display;
   836     window.flags = SDL_WINDOW_FOREIGN;
   837 
   838     if (!_this->CreateWindowFrom ||
   839         _this->CreateWindowFrom(_this, &window, data) < 0) {
   840         return 0;
   841     }
   842     display = &SDL_CurrentDisplay;
   843     num_windows = display->num_windows;
   844     windows =
   845         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   846     if (!windows) {
   847         if (_this->DestroyWindow) {
   848             _this->DestroyWindow(_this, &window);
   849         }
   850         if (window.title) {
   851             SDL_free(window.title);
   852         }
   853         return 0;
   854     }
   855     windows[num_windows] = window;
   856     display->windows = windows;
   857     display->num_windows++;
   858 
   859     return window.id;
   860 }
   861 
   862 int
   863 SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
   864 {
   865     const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
   866                                   SDL_WINDOW_OPENGL |
   867                                   SDL_WINDOW_BORDERLESS |
   868                                   SDL_WINDOW_RESIZABLE |
   869                                   SDL_WINDOW_INPUT_GRABBED);
   870     char *title = window->title;
   871 
   872     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   873         SDL_SetError("No OpenGL support in video driver");
   874         return -1;
   875     }
   876     if ((window->flags & SDL_WINDOW_OPENGL) != (flags & SDL_WINDOW_OPENGL)) {
   877         if (flags & SDL_WINDOW_OPENGL) {
   878             SDL_GL_LoadLibrary(NULL);
   879         } else {
   880             SDL_GL_UnloadLibrary();
   881         }
   882     }
   883 
   884     if (window->flags & SDL_WINDOW_FOREIGN) {
   885         /* Can't destroy and re-create foreign windows, hrm */
   886         flags |= SDL_WINDOW_FOREIGN;
   887     } else {
   888         flags &= ~SDL_WINDOW_FOREIGN;
   889     }
   890 
   891     if (_this->DestroyWindow && !(flags & SDL_WINDOW_FOREIGN)) {
   892         _this->DestroyWindow(_this, window);
   893     }
   894 
   895     window->title = NULL;
   896     window->flags = (flags & allowed_flags);
   897 
   898     if (_this->CreateWindow && !(flags & SDL_WINDOW_FOREIGN)) {
   899         if (_this->CreateWindow(_this, window) < 0) {
   900             if (flags & SDL_WINDOW_OPENGL) {
   901                 SDL_GL_UnloadLibrary();
   902             }
   903             return -1;
   904         }
   905     }
   906 
   907     if (title) {
   908         SDL_SetWindowTitle(window->id, title);
   909         SDL_free(title);
   910     }
   911     if (flags & SDL_WINDOW_MAXIMIZED) {
   912         SDL_MaximizeWindow(window->id);
   913     }
   914     if (flags & SDL_WINDOW_MINIMIZED) {
   915         SDL_MinimizeWindow(window->id);
   916     }
   917     if (flags & SDL_WINDOW_SHOWN) {
   918         SDL_ShowWindow(window->id);
   919     }
   920     SDL_UpdateWindowGrab(window);
   921 
   922     return 0;
   923 }
   924 
   925 SDL_Window *
   926 SDL_GetWindowFromID(SDL_WindowID windowID)
   927 {
   928     int i, j;
   929 
   930     if (!_this) {
   931         SDL_UninitializedVideo();
   932         return NULL;
   933     }
   934     for (i = 0; i < _this->num_displays; ++i) {
   935         SDL_VideoDisplay *display = &_this->displays[i];
   936         for (j = 0; j < display->num_windows; ++j) {
   937             SDL_Window *window = &display->windows[j];
   938             if (window->id == windowID) {
   939                 return window;
   940             }
   941         }
   942     }
   943     return NULL;
   944 }
   945 
   946 SDL_VideoDisplay *
   947 SDL_GetDisplayFromWindow(SDL_Window * window)
   948 {
   949     if (!_this) {
   950         SDL_UninitializedVideo();
   951         return NULL;
   952     }
   953     if (!window) {
   954         return NULL;
   955     }
   956     return &_this->displays[window->display];
   957 }
   958 
   959 Uint32
   960 SDL_GetWindowFlags(SDL_WindowID windowID)
   961 {
   962     SDL_Window *window = SDL_GetWindowFromID(windowID);
   963 
   964     if (!window) {
   965         return 0;
   966     }
   967     return window->flags;
   968 }
   969 
   970 void
   971 SDL_SetWindowTitle(SDL_WindowID windowID, const char *title)
   972 {
   973     SDL_Window *window = SDL_GetWindowFromID(windowID);
   974 
   975     if (!window || title == window->title) {
   976         return;
   977     }
   978     if (window->title) {
   979         SDL_free(window->title);
   980     }
   981     if (title) {
   982         window->title = SDL_strdup(title);
   983     } else {
   984         window->title = NULL;
   985     }
   986 
   987     if (_this->SetWindowTitle) {
   988         _this->SetWindowTitle(_this, window);
   989     }
   990 }
   991 
   992 const char *
   993 SDL_GetWindowTitle(SDL_WindowID windowID)
   994 {
   995     SDL_Window *window = SDL_GetWindowFromID(windowID);
   996 
   997     if (!window) {
   998         return NULL;
   999     }
  1000     return window->title;
  1001 }
  1002 
  1003 void
  1004 SDL_SetWindowIcon(SDL_WindowID windowID, SDL_Surface * icon)
  1005 {
  1006     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1007 
  1008     if (!window) {
  1009         return;
  1010     }
  1011     if (_this->SetWindowIcon) {
  1012         _this->SetWindowIcon(_this, window, icon);
  1013     }
  1014 }
  1015 
  1016 void
  1017 SDL_SetWindowData(SDL_WindowID windowID, void *userdata)
  1018 {
  1019     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1020 
  1021     if (!window) {
  1022         return;
  1023     }
  1024     window->userdata = userdata;
  1025 }
  1026 
  1027 void *
  1028 SDL_GetWindowData(SDL_WindowID windowID)
  1029 {
  1030     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1031 
  1032     if (!window) {
  1033         return NULL;
  1034     }
  1035     return window->userdata;
  1036 }
  1037 
  1038 void
  1039 SDL_SetWindowPosition(SDL_WindowID windowID, int x, int y)
  1040 {
  1041     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1042     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1043 
  1044     if (!window) {
  1045         return;
  1046     }
  1047     if (x != SDL_WINDOWPOS_UNDEFINED) {
  1048         window->x = x;
  1049     }
  1050     if (y != SDL_WINDOWPOS_UNDEFINED) {
  1051         window->y = y;
  1052     }
  1053     if (_this->SetWindowPosition) {
  1054         _this->SetWindowPosition(_this, window);
  1055     }
  1056     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MOVED, x, y);
  1057 }
  1058 
  1059 void
  1060 SDL_GetWindowPosition(SDL_WindowID windowID, int *x, int *y)
  1061 {
  1062     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1063 
  1064     if (!window) {
  1065         return;
  1066     }
  1067     if (x) {
  1068         *x = window->x;
  1069     }
  1070     if (y) {
  1071         *y = window->y;
  1072     }
  1073 }
  1074 
  1075 void
  1076 SDL_SetWindowSize(SDL_WindowID windowID, int w, int h)
  1077 {
  1078     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1079 
  1080     if (!window) {
  1081         return;
  1082     }
  1083     window->w = w;
  1084     window->h = h;
  1085 
  1086     if (_this->SetWindowSize) {
  1087         _this->SetWindowSize(_this, window);
  1088     }
  1089     SDL_OnWindowResized(window);
  1090 }
  1091 
  1092 void
  1093 SDL_GetWindowSize(SDL_WindowID windowID, int *w, int *h)
  1094 {
  1095     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1096 
  1097     if (window) {
  1098         if (w) {
  1099             *w = window->w;
  1100         }
  1101         if (h) {
  1102             *h = window->h;
  1103         }
  1104     } else {
  1105         if (w) {
  1106             *w = 0;
  1107         }
  1108         if (h) {
  1109             *h = 0;
  1110         }
  1111     }
  1112 }
  1113 
  1114 void
  1115 SDL_ShowWindow(SDL_WindowID windowID)
  1116 {
  1117     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1118 
  1119     if (!window || (window->flags & SDL_WINDOW_SHOWN)) {
  1120         return;
  1121     }
  1122 
  1123     if (_this->ShowWindow) {
  1124         _this->ShowWindow(_this, window);
  1125     }
  1126     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_SHOWN, 0, 0);
  1127 }
  1128 
  1129 void
  1130 SDL_HideWindow(SDL_WindowID windowID)
  1131 {
  1132     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1133 
  1134     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1135         return;
  1136     }
  1137 
  1138     if (_this->HideWindow) {
  1139         _this->HideWindow(_this, window);
  1140     }
  1141     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_HIDDEN, 0, 0);
  1142 }
  1143 
  1144 void
  1145 SDL_RaiseWindow(SDL_WindowID windowID)
  1146 {
  1147     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1148 
  1149     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1150         return;
  1151     }
  1152     if (_this->RaiseWindow) {
  1153         _this->RaiseWindow(_this, window);
  1154     }
  1155 }
  1156 
  1157 void
  1158 SDL_MaximizeWindow(SDL_WindowID windowID)
  1159 {
  1160     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1161 
  1162     if (!window || (window->flags & SDL_WINDOW_MAXIMIZED)) {
  1163         return;
  1164     }
  1165 
  1166     if (_this->MaximizeWindow) {
  1167         _this->MaximizeWindow(_this, window);
  1168     }
  1169     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MAXIMIZED, 0, 0);
  1170 }
  1171 
  1172 void
  1173 SDL_MinimizeWindow(SDL_WindowID windowID)
  1174 {
  1175     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1176 
  1177     if (!window || (window->flags & SDL_WINDOW_MINIMIZED)) {
  1178         return;
  1179     }
  1180 
  1181     if (_this->MinimizeWindow) {
  1182         _this->MinimizeWindow(_this, window);
  1183     }
  1184     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MINIMIZED, 0, 0);
  1185 }
  1186 
  1187 void
  1188 SDL_RestoreWindow(SDL_WindowID windowID)
  1189 {
  1190     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1191 
  1192     if (!window
  1193         || !(window->flags & (SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED))) {
  1194         return;
  1195     }
  1196 
  1197     if (_this->RestoreWindow) {
  1198         _this->RestoreWindow(_this, window);
  1199     }
  1200     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_RESTORED, 0, 0);
  1201 }
  1202 
  1203 int
  1204 SDL_SetWindowFullscreen(SDL_WindowID windowID, int fullscreen)
  1205 {
  1206     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1207 
  1208     if (!window) {
  1209         return -1;
  1210     }
  1211     if (fullscreen) {
  1212         fullscreen = SDL_WINDOW_FULLSCREEN;
  1213     }
  1214     if ((window->flags & SDL_WINDOW_FULLSCREEN) == fullscreen) {
  1215         return 0;
  1216     }
  1217     if (fullscreen) {
  1218         window->flags |= SDL_WINDOW_FULLSCREEN;
  1219 
  1220         if (FULLSCREEN_VISIBLE(window)) {
  1221             SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1222 
  1223             /* Hide any other fullscreen windows */
  1224             int i;
  1225             for (i = 0; i < display->num_windows; ++i) {
  1226                 SDL_Window *other = &display->windows[i];
  1227                 if (other->id != windowID && FULLSCREEN_VISIBLE(other)) {
  1228                     SDL_MinimizeWindow(other->id);
  1229                 }
  1230             }
  1231 
  1232             SDL_SetDisplayMode(&display->fullscreen_mode);
  1233         }
  1234     } else {
  1235         window->flags &= ~SDL_WINDOW_FULLSCREEN;
  1236 
  1237         if (FULLSCREEN_VISIBLE(window)) {
  1238             SDL_SetDisplayMode(NULL);
  1239         }
  1240     }
  1241     return 0;
  1242 }
  1243 
  1244 void
  1245 SDL_SetWindowGrab(SDL_WindowID windowID, int mode)
  1246 {
  1247     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1248 
  1249     if (!window || (!!mode == !!(window->flags & SDL_WINDOW_INPUT_GRABBED))) {
  1250         return;
  1251     }
  1252     if (mode) {
  1253         window->flags |= SDL_WINDOW_INPUT_GRABBED;
  1254     } else {
  1255         window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
  1256     }
  1257     SDL_UpdateWindowGrab(window);
  1258 }
  1259 
  1260 static void
  1261 SDL_UpdateWindowGrab(SDL_Window * window)
  1262 {
  1263     if ((window->flags & SDL_WINDOW_INPUT_FOCUS) && _this->SetWindowGrab) {
  1264         _this->SetWindowGrab(_this, window);
  1265     }
  1266 }
  1267 
  1268 int
  1269 SDL_GetWindowGrab(SDL_WindowID windowID)
  1270 {
  1271     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1272 
  1273     if (!window) {
  1274         return 0;
  1275     }
  1276     return ((window->flags & SDL_WINDOW_INPUT_GRABBED) != 0);
  1277 }
  1278 
  1279 void
  1280 SDL_OnWindowShown(SDL_Window * window)
  1281 {
  1282     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1283         SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_FOCUS_GAINED, 0, 0);
  1284     }
  1285 }
  1286 
  1287 void
  1288 SDL_OnWindowHidden(SDL_Window * window)
  1289 {
  1290     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1291         SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
  1292     }
  1293 }
  1294 
  1295 void
  1296 SDL_OnWindowResized(SDL_Window * window)
  1297 {
  1298     SDL_Renderer *renderer = window->renderer;
  1299 
  1300     if (renderer && renderer->DisplayModeChanged) {
  1301         renderer->DisplayModeChanged(renderer);
  1302     }
  1303 }
  1304 
  1305 void
  1306 SDL_OnWindowFocusGained(SDL_Window * window)
  1307 {
  1308     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1309 
  1310     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1311         SDL_SetDisplayMode(&display->fullscreen_mode);
  1312     }
  1313     if (display->gamma && _this->SetDisplayGammaRamp) {
  1314         _this->SetDisplayGammaRamp(_this, display->gamma);
  1315     }
  1316     if ((window->flags & (SDL_WINDOW_INPUT_GRABBED | SDL_WINDOW_FULLSCREEN))
  1317         && _this->SetWindowGrab) {
  1318         _this->SetWindowGrab(_this, window);
  1319     }
  1320 }
  1321 
  1322 void
  1323 SDL_OnWindowFocusLost(SDL_Window * window)
  1324 {
  1325     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1326 
  1327     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1328         SDL_MinimizeWindow(window->id);
  1329         SDL_SetDisplayMode(NULL);
  1330     }
  1331     if (display->gamma && _this->SetDisplayGammaRamp) {
  1332         _this->SetDisplayGammaRamp(_this, display->saved_gamma);
  1333     }
  1334     if ((window->flags & (SDL_WINDOW_INPUT_GRABBED | SDL_WINDOW_FULLSCREEN))
  1335         && _this->SetWindowGrab) {
  1336         _this->SetWindowGrab(_this, window);
  1337     }
  1338 }
  1339 
  1340 SDL_WindowID
  1341 SDL_GetFocusWindow(void)
  1342 {
  1343     SDL_VideoDisplay *display;
  1344     int i;
  1345 
  1346     if (!_this) {
  1347         return 0;
  1348     }
  1349     display = &SDL_CurrentDisplay;
  1350     for (i = 0; i < display->num_windows; ++i) {
  1351         SDL_Window *window = &display->windows[i];
  1352 
  1353         if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
  1354             return window->id;
  1355         }
  1356     }
  1357     return 0;
  1358 }
  1359 
  1360 void
  1361 SDL_DestroyWindow(SDL_WindowID windowID)
  1362 {
  1363     int i, j;
  1364 
  1365     if (!_this) {
  1366         return;
  1367     }
  1368     /* Restore video mode, etc. */
  1369     SDL_SendWindowEvent(windowID, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
  1370 
  1371     for (i = 0; i < _this->num_displays; ++i) {
  1372         SDL_VideoDisplay *display = &_this->displays[i];
  1373         for (j = 0; j < display->num_windows; ++j) {
  1374             SDL_Window *window = &display->windows[j];
  1375             if (window->id != windowID) {
  1376                 continue;
  1377             }
  1378             if (window->title) {
  1379                 SDL_free(window->title);
  1380                 window->title = NULL;
  1381             }
  1382             if (window->renderer) {
  1383                 SDL_DestroyRenderer(window->id);
  1384                 window->renderer = NULL;
  1385             }
  1386             if (_this->DestroyWindow) {
  1387                 _this->DestroyWindow(_this, window);
  1388             }
  1389             if (window->flags & SDL_WINDOW_OPENGL) {
  1390                 SDL_GL_UnloadLibrary();
  1391             }
  1392             if (j != display->num_windows - 1) {
  1393                 SDL_memcpy(&display->windows[i],
  1394                            &display->windows[i + 1],
  1395                            (display->num_windows - i - 1) * sizeof(*window));
  1396             }
  1397             --display->num_windows;
  1398             return;
  1399         }
  1400     }
  1401 }
  1402 
  1403 void
  1404 SDL_AddRenderDriver(int displayIndex, const SDL_RenderDriver * driver)
  1405 {
  1406     SDL_VideoDisplay *display;
  1407     SDL_RenderDriver *render_drivers;
  1408 
  1409     if (displayIndex >= _this->num_displays) {
  1410         return;
  1411     }
  1412     display = &_this->displays[displayIndex];
  1413 
  1414     render_drivers =
  1415         SDL_realloc(display->render_drivers,
  1416                     (display->num_render_drivers +
  1417                      1) * sizeof(*render_drivers));
  1418     if (render_drivers) {
  1419         render_drivers[display->num_render_drivers] = *driver;
  1420         display->render_drivers = render_drivers;
  1421         display->num_render_drivers++;
  1422     }
  1423 }
  1424 
  1425 int
  1426 SDL_GetNumRenderDrivers(void)
  1427 {
  1428     if (_this) {
  1429         return SDL_CurrentDisplay.num_render_drivers;
  1430     }
  1431     return 0;
  1432 }
  1433 
  1434 int
  1435 SDL_GetRenderDriverInfo(int index, SDL_RendererInfo * info)
  1436 {
  1437     if (!_this) {
  1438         SDL_UninitializedVideo();
  1439         return -1;
  1440     }
  1441     if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
  1442         SDL_SetError("index must be in the range of 0 - %d",
  1443                      SDL_GetNumRenderDrivers() - 1);
  1444         return -1;
  1445     }
  1446     *info = SDL_CurrentDisplay.render_drivers[index].info;
  1447     return 0;
  1448 }
  1449 
  1450 int
  1451 SDL_CreateRenderer(SDL_WindowID windowID, int index, Uint32 flags)
  1452 {
  1453     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1454 
  1455     if (!window) {
  1456         return 0;
  1457     }
  1458     if (index < 0) {
  1459         const char *override = SDL_getenv("SDL_VIDEO_RENDERER");
  1460         int n = SDL_GetNumRenderDrivers();
  1461         for (index = 0; index < n; ++index) {
  1462             SDL_RenderDriver *driver =
  1463                 &SDL_CurrentDisplay.render_drivers[index];
  1464 
  1465             if (override) {
  1466                 if (SDL_strcasecmp(override, driver->info.name) == 0) {
  1467                     break;
  1468                 }
  1469             } else {
  1470                 if ((driver->info.flags & flags) == flags) {
  1471                     break;
  1472                 }
  1473             }
  1474         }
  1475         if (index == n) {
  1476             SDL_SetError("Couldn't find matching render driver");
  1477             return -1;
  1478         }
  1479     }
  1480     if (index >= SDL_GetNumRenderDrivers()) {
  1481         SDL_SetError("index must be -1 or in the range of 0 - %d",
  1482                      SDL_GetNumRenderDrivers() - 1);
  1483         return -1;
  1484     }
  1485     /* Free any existing renderer */
  1486     SDL_DestroyRenderer(windowID);
  1487 
  1488     /* Create a new renderer instance */
  1489     window->renderer = SDL_CurrentDisplay.render_drivers[index]
  1490         .CreateRenderer(window, flags);
  1491     SDL_SelectRenderer(window->id);
  1492 
  1493     return 0;
  1494 }
  1495 
  1496 int
  1497 SDL_SelectRenderer(SDL_WindowID windowID)
  1498 {
  1499     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1500     SDL_Renderer *renderer;
  1501 
  1502     if (!window || !window->renderer) {
  1503         return -1;
  1504     }
  1505     renderer = window->renderer;
  1506     if (renderer && renderer->ActivateRenderer) {
  1507         if (renderer->ActivateRenderer(renderer) < 0) {
  1508             return -1;
  1509         }
  1510     }
  1511     SDL_CurrentDisplay.current_renderer = renderer;
  1512     return 0;
  1513 }
  1514 
  1515 int
  1516 SDL_GetRendererInfo(SDL_RendererInfo * info)
  1517 {
  1518     if (!_this) {
  1519         SDL_UninitializedVideo();
  1520         return -1;
  1521     }
  1522     if (!SDL_CurrentDisplay.current_renderer) {
  1523         SDL_SetError("There is no current renderer");
  1524         return -1;
  1525     }
  1526     *info = SDL_CurrentDisplay.current_renderer->info;
  1527     return 0;
  1528 }
  1529 
  1530 SDL_TextureID
  1531 SDL_CreateTexture(Uint32 format, int access, int w, int h)
  1532 {
  1533     int hash;
  1534     SDL_Renderer *renderer;
  1535     SDL_Texture *texture;
  1536 
  1537     if (!_this) {
  1538         SDL_UninitializedVideo();
  1539         return 0;
  1540     }
  1541     renderer = SDL_CurrentDisplay.current_renderer;
  1542     if (!renderer) {
  1543         return 0;
  1544     }
  1545     if (!renderer->CreateTexture) {
  1546         SDL_Unsupported();
  1547         return 0;
  1548     }
  1549     texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
  1550     if (!texture) {
  1551         SDL_OutOfMemory();
  1552         return 0;
  1553     }
  1554     texture->id = _this->next_object_id++;
  1555     texture->format = format;
  1556     texture->access = access;
  1557     texture->w = w;
  1558     texture->h = h;
  1559     texture->r = 255;
  1560     texture->g = 255;
  1561     texture->b = 255;
  1562     texture->a = 255;
  1563     texture->renderer = renderer;
  1564 
  1565     if (renderer->CreateTexture(renderer, texture) < 0) {
  1566         if (renderer->DestroyTexture) {
  1567             renderer->DestroyTexture(renderer, texture);
  1568         }
  1569         SDL_free(texture);
  1570         return 0;
  1571     }
  1572     hash = (texture->id % SDL_arraysize(SDL_CurrentDisplay.textures));
  1573     texture->next = SDL_CurrentDisplay.textures[hash];
  1574     SDL_CurrentDisplay.textures[hash] = texture;
  1575 
  1576     return texture->id;
  1577 }
  1578 
  1579 SDL_TextureID
  1580 SDL_CreateTextureFromSurface(Uint32 format, SDL_Surface * surface)
  1581 {
  1582     SDL_TextureID textureID;
  1583     Uint32 requested_format = format;
  1584     SDL_PixelFormat *fmt;
  1585     int bpp;
  1586     Uint32 Rmask, Gmask, Bmask, Amask;
  1587 
  1588     if (!surface) {
  1589         SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
  1590         return 0;
  1591     }
  1592     fmt = surface->format;
  1593 
  1594     if (format) {
  1595         if (!SDL_PixelFormatEnumToMasks
  1596             (format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
  1597             SDL_SetError("Unknown pixel format");
  1598             return 0;
  1599         }
  1600     } else {
  1601         if (surface->format->Amask
  1602             || !(surface->map->info.flags &
  1603                  (SDL_COPY_COLORKEY | SDL_COPY_MASK | SDL_COPY_BLEND))) {
  1604             bpp = fmt->BitsPerPixel;
  1605             Rmask = fmt->Rmask;
  1606             Gmask = fmt->Gmask;
  1607             Bmask = fmt->Bmask;
  1608             Amask = fmt->Amask;
  1609         } else {
  1610             /* Need a format with alpha */
  1611             bpp = 32;
  1612             Rmask = 0x00FF0000;
  1613             Gmask = 0x0000FF00;
  1614             Bmask = 0x000000FF;
  1615             Amask = 0xFF000000;
  1616         }
  1617         format = SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
  1618         if (!format) {
  1619             SDL_SetError("Unknown pixel format");
  1620             return 0;
  1621         }
  1622     }
  1623 
  1624     textureID =
  1625         SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1626                           surface->h);
  1627     if (!textureID && !requested_format) {
  1628         SDL_DisplayMode desktop_mode;
  1629         SDL_GetDesktopDisplayMode(&desktop_mode);
  1630         format = desktop_mode.format;
  1631         textureID =
  1632             SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1633                               surface->h);
  1634     }
  1635     if (!textureID) {
  1636         return 0;
  1637     }
  1638     if (bpp == fmt->BitsPerPixel && Rmask == fmt->Rmask && Gmask == fmt->Gmask
  1639         && Bmask == fmt->Bmask && Amask == fmt->Amask) {
  1640         if (SDL_MUSTLOCK(surface)) {
  1641             if (SDL_LockSurface(surface) < 0) {
  1642                 SDL_DestroyTexture(textureID);
  1643                 return 0;
  1644             }
  1645             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1646                               surface->pitch);
  1647             SDL_UnlockSurface(surface);
  1648         } else {
  1649             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1650                               surface->pitch);
  1651         }
  1652     } else {
  1653         SDL_PixelFormat dst_fmt;
  1654         SDL_Surface *dst = NULL;
  1655 
  1656         /* Set up a destination surface for the texture update */
  1657         SDL_InitFormat(&dst_fmt, bpp, Rmask, Gmask, Bmask, Amask);
  1658         if (SDL_ISPIXELFORMAT_INDEXED(format)) {
  1659             dst_fmt.palette =
  1660                 SDL_AllocPalette((1 << SDL_BITSPERPIXEL(format)));
  1661             if (dst_fmt.palette) {
  1662                 /*
  1663                  * FIXME: Should we try to copy
  1664                  * fmt->palette?
  1665                  */
  1666                 SDL_DitherColors(dst_fmt.palette->colors,
  1667                                  SDL_BITSPERPIXEL(format));
  1668             }
  1669         }
  1670         dst = SDL_ConvertSurface(surface, &dst_fmt, 0);
  1671         if (dst) {
  1672             SDL_UpdateTexture(textureID, NULL, dst->pixels, dst->pitch);
  1673             SDL_FreeSurface(dst);
  1674         }
  1675         if (dst_fmt.palette) {
  1676             SDL_FreePalette(dst_fmt.palette);
  1677         }
  1678         if (!dst) {
  1679             SDL_DestroyTexture(textureID);
  1680             return 0;
  1681         }
  1682     }
  1683 
  1684     {
  1685         Uint8 r, g, b, a;
  1686         int blendMode;
  1687         int scaleMode;
  1688 
  1689         SDL_GetSurfaceColorMod(surface, &r, &g, &b);
  1690         SDL_SetTextureColorMod(textureID, r, g, b);
  1691 
  1692         SDL_GetSurfaceAlphaMod(surface, &a);
  1693         SDL_SetTextureAlphaMod(textureID, a);
  1694 
  1695         SDL_GetSurfaceBlendMode(surface, &blendMode);
  1696         SDL_SetTextureBlendMode(textureID, blendMode);
  1697 
  1698         SDL_GetSurfaceScaleMode(surface, &scaleMode);
  1699         SDL_SetTextureScaleMode(textureID, scaleMode);
  1700     }
  1701 
  1702     if (SDL_ISPIXELFORMAT_INDEXED(format) && fmt->palette) {
  1703         SDL_SetTexturePalette(textureID, fmt->palette->colors, 0,
  1704                               fmt->palette->ncolors);
  1705     }
  1706     return textureID;
  1707 }
  1708 
  1709 static __inline__ SDL_Texture *
  1710 SDL_GetTextureFromID(SDL_TextureID textureID)
  1711 {
  1712     int hash;
  1713     SDL_Texture *texture;
  1714 
  1715     if (!_this) {
  1716         return NULL;
  1717     }
  1718     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  1719     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  1720          texture = texture->next) {
  1721         if (texture->id == textureID) {
  1722             return texture;
  1723         }
  1724     }
  1725     return NULL;
  1726 }
  1727 
  1728 int
  1729 SDL_QueryTexture(SDL_TextureID textureID, Uint32 * format, int *access,
  1730                  int *w, int *h)
  1731 {
  1732     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1733 
  1734     if (!texture) {
  1735         return -1;
  1736     }
  1737     if (format) {
  1738         *format = texture->format;
  1739     }
  1740     if (access) {
  1741         *access = texture->access;
  1742     }
  1743     if (w) {
  1744         *w = texture->w;
  1745     }
  1746     if (h) {
  1747         *h = texture->h;
  1748     }
  1749     return 0;
  1750 }
  1751 
  1752 int
  1753 SDL_QueryTexturePixels(SDL_TextureID textureID, void **pixels, int *pitch)
  1754 {
  1755     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1756     SDL_Renderer *renderer;
  1757 
  1758     if (!texture) {
  1759         return -1;
  1760     }
  1761     renderer = texture->renderer;
  1762     if (!renderer->QueryTexturePixels) {
  1763         SDL_Unsupported();
  1764         return -1;
  1765     }
  1766     return renderer->QueryTexturePixels(renderer, texture, pixels, pitch);
  1767 }
  1768 
  1769 int
  1770 SDL_SetTexturePalette(SDL_TextureID textureID, const SDL_Color * colors,
  1771                       int firstcolor, int ncolors)
  1772 {
  1773     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1774     SDL_Renderer *renderer;
  1775 
  1776     if (!texture) {
  1777         return -1;
  1778     }
  1779     renderer = texture->renderer;
  1780     if (!renderer->SetTexturePalette) {
  1781         SDL_Unsupported();
  1782         return -1;
  1783     }
  1784     return renderer->SetTexturePalette(renderer, texture, colors, firstcolor,
  1785                                        ncolors);
  1786 }
  1787 
  1788 int
  1789 SDL_GetTexturePalette(SDL_TextureID textureID, SDL_Color * colors,
  1790                       int firstcolor, int ncolors)
  1791 {
  1792     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1793     SDL_Renderer *renderer;
  1794 
  1795     if (!texture) {
  1796         return -1;
  1797     }
  1798     renderer = texture->renderer;
  1799     if (!renderer->GetTexturePalette) {
  1800         SDL_Unsupported();
  1801         return -1;
  1802     }
  1803     return renderer->GetTexturePalette(renderer, texture, colors, firstcolor,
  1804                                        ncolors);
  1805 }
  1806 
  1807 int
  1808 SDL_SetTextureColorMod(SDL_TextureID textureID, Uint8 r, Uint8 g, Uint8 b)
  1809 {
  1810     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1811     SDL_Renderer *renderer;
  1812 
  1813     if (!texture) {
  1814         return -1;
  1815     }
  1816     renderer = texture->renderer;
  1817     if (!renderer->SetTextureColorMod) {
  1818         SDL_Unsupported();
  1819         return -1;
  1820     }
  1821     if (r < 255 || g < 255 || b < 255) {
  1822         texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
  1823     } else {
  1824         texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
  1825     }
  1826     texture->r = r;
  1827     texture->g = g;
  1828     texture->b = b;
  1829     return renderer->SetTextureColorMod(renderer, texture);
  1830 }
  1831 
  1832 int
  1833 SDL_GetTextureColorMod(SDL_TextureID textureID, Uint8 * r, Uint8 * g,
  1834                        Uint8 * b)
  1835 {
  1836     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1837     SDL_Renderer *renderer;
  1838 
  1839     if (!texture) {
  1840         return -1;
  1841     }
  1842     renderer = texture->renderer;
  1843     if (r) {
  1844         *r = texture->r;
  1845     }
  1846     if (g) {
  1847         *g = texture->g;
  1848     }
  1849     if (b) {
  1850         *b = texture->b;
  1851     }
  1852     return 0;
  1853 }
  1854 
  1855 int
  1856 SDL_SetTextureAlphaMod(SDL_TextureID textureID, Uint8 alpha)
  1857 {
  1858     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1859     SDL_Renderer *renderer;
  1860 
  1861     if (!texture) {
  1862         return -1;
  1863     }
  1864     renderer = texture->renderer;
  1865     if (!renderer->SetTextureAlphaMod) {
  1866         SDL_Unsupported();
  1867         return -1;
  1868     }
  1869     if (alpha < 255) {
  1870         texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
  1871     } else {
  1872         texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
  1873     }
  1874     texture->a = alpha;
  1875     return renderer->SetTextureAlphaMod(renderer, texture);
  1876 }
  1877 
  1878 int
  1879 SDL_GetTextureAlphaMod(SDL_TextureID textureID, Uint8 * alpha)
  1880 {
  1881     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1882 
  1883     if (!texture) {
  1884         return -1;
  1885     }
  1886     if (alpha) {
  1887         *alpha = texture->a;
  1888     }
  1889     return 0;
  1890 }
  1891 
  1892 int
  1893 SDL_SetTextureBlendMode(SDL_TextureID textureID, int blendMode)
  1894 {
  1895     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1896     SDL_Renderer *renderer;
  1897 
  1898     if (!texture) {
  1899         return -1;
  1900     }
  1901     renderer = texture->renderer;
  1902     if (!renderer->SetTextureBlendMode) {
  1903         SDL_Unsupported();
  1904         return -1;
  1905     }
  1906     texture->blendMode = blendMode;
  1907     return renderer->SetTextureBlendMode(renderer, texture);
  1908 }
  1909 
  1910 int
  1911 SDL_GetTextureBlendMode(SDL_TextureID textureID, int *blendMode)
  1912 {
  1913     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1914 
  1915     if (!texture) {
  1916         return -1;
  1917     }
  1918     if (blendMode) {
  1919         *blendMode = texture->blendMode;
  1920     }
  1921     return 0;
  1922 }
  1923 
  1924 int
  1925 SDL_SetTextureScaleMode(SDL_TextureID textureID, int scaleMode)
  1926 {
  1927     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1928     SDL_Renderer *renderer;
  1929 
  1930     if (!texture) {
  1931         return -1;
  1932     }
  1933     renderer = texture->renderer;
  1934     if (!renderer->SetTextureScaleMode) {
  1935         SDL_Unsupported();
  1936         return -1;
  1937     }
  1938     texture->scaleMode = scaleMode;
  1939     return renderer->SetTextureScaleMode(renderer, texture);
  1940 }
  1941 
  1942 int
  1943 SDL_GetTextureScaleMode(SDL_TextureID textureID, int *scaleMode)
  1944 {
  1945     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1946 
  1947     if (!texture) {
  1948         return -1;
  1949     }
  1950     if (scaleMode) {
  1951         *scaleMode = texture->scaleMode;
  1952     }
  1953     return 0;
  1954 }
  1955 
  1956 int
  1957 SDL_UpdateTexture(SDL_TextureID textureID, const SDL_Rect * rect,
  1958                   const void *pixels, int pitch)
  1959 {
  1960     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1961     SDL_Renderer *renderer;
  1962     SDL_Rect full_rect;
  1963 
  1964     if (!texture) {
  1965         return -1;
  1966     }
  1967     renderer = texture->renderer;
  1968     if (!renderer->UpdateTexture) {
  1969         SDL_Unsupported();
  1970         return -1;
  1971     }
  1972     if (!rect) {
  1973         full_rect.x = 0;
  1974         full_rect.y = 0;
  1975         full_rect.w = texture->w;
  1976         full_rect.h = texture->h;
  1977         rect = &full_rect;
  1978     }
  1979     return renderer->UpdateTexture(renderer, texture, rect, pixels, pitch);
  1980 }
  1981 
  1982 int
  1983 SDL_LockTexture(SDL_TextureID textureID, const SDL_Rect * rect, int markDirty,
  1984                 void **pixels, int *pitch)
  1985 {
  1986     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1987     SDL_Renderer *renderer;
  1988     SDL_Rect full_rect;
  1989 
  1990     if (!texture) {
  1991         return -1;
  1992     }
  1993     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1994         SDL_SetError("SDL_LockTexture(): texture must be streaming");
  1995         return -1;
  1996     }
  1997     renderer = texture->renderer;
  1998     if (!renderer->LockTexture) {
  1999         SDL_Unsupported();
  2000         return -1;
  2001     }
  2002     if (!rect) {
  2003         full_rect.x = 0;
  2004         full_rect.y = 0;
  2005         full_rect.w = texture->w;
  2006         full_rect.h = texture->h;
  2007         rect = &full_rect;
  2008     }
  2009     return renderer->LockTexture(renderer, texture, rect, markDirty, pixels,
  2010                                  pitch);
  2011 }
  2012 
  2013 void
  2014 SDL_UnlockTexture(SDL_TextureID textureID)
  2015 {
  2016     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2017     SDL_Renderer *renderer;
  2018 
  2019     if (!texture) {
  2020         return;
  2021     }
  2022     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  2023         return;
  2024     }
  2025     renderer = texture->renderer;
  2026     if (!renderer->UnlockTexture) {
  2027         return;
  2028     }
  2029     renderer->UnlockTexture(renderer, texture);
  2030 }
  2031 
  2032 void
  2033 SDL_DirtyTexture(SDL_TextureID textureID, int numrects,
  2034                  const SDL_Rect * rects)
  2035 {
  2036     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2037     SDL_Renderer *renderer;
  2038 
  2039     if (!texture) {
  2040         return;
  2041     }
  2042     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  2043         return;
  2044     }
  2045     renderer = texture->renderer;
  2046     if (!renderer->DirtyTexture) {
  2047         return;
  2048     }
  2049     renderer->DirtyTexture(renderer, texture, numrects, rects);
  2050 }
  2051 
  2052 int
  2053 SDL_SetRenderDrawColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a)
  2054 {
  2055     SDL_Renderer *renderer;
  2056 
  2057     if (!_this) {
  2058         SDL_UninitializedVideo();
  2059         return -1;
  2060     }
  2061     renderer = SDL_CurrentDisplay.current_renderer;
  2062     if (!renderer) {
  2063         return -1;
  2064     }
  2065     renderer->r = r;
  2066     renderer->g = g;
  2067     renderer->b = b;
  2068     renderer->a = a;
  2069     if (renderer->SetDrawColor) {
  2070         return renderer->SetDrawColor(renderer);
  2071     } else {
  2072         return 0;
  2073     }
  2074 }
  2075 
  2076 int
  2077 SDL_GetRenderDrawColor(Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a)
  2078 {
  2079     SDL_Renderer *renderer;
  2080 
  2081     if (!_this) {
  2082         SDL_UninitializedVideo();
  2083         return -1;
  2084     }
  2085     renderer = SDL_CurrentDisplay.current_renderer;
  2086     if (!renderer) {
  2087         return -1;
  2088     }
  2089     if (r) {
  2090         *r = renderer->r;
  2091     }
  2092     if (g) {
  2093         *g = renderer->g;
  2094     }
  2095     if (b) {
  2096         *b = renderer->b;
  2097     }
  2098     if (a) {
  2099         *a = renderer->a;
  2100     }
  2101     return 0;
  2102 }
  2103 
  2104 int
  2105 SDL_SetRenderDrawBlendMode(int blendMode)
  2106 {
  2107     SDL_Renderer *renderer;
  2108 
  2109     if (!_this) {
  2110         SDL_UninitializedVideo();
  2111         return -1;
  2112     }
  2113     renderer = SDL_CurrentDisplay.current_renderer;
  2114     if (!renderer) {
  2115         return -1;
  2116     }
  2117     renderer->blendMode = blendMode;
  2118     if (renderer->SetDrawBlendMode) {
  2119         return renderer->SetDrawBlendMode(renderer);
  2120     } else {
  2121         return 0;
  2122     }
  2123 }
  2124 
  2125 int
  2126 SDL_GetRenderDrawBlendMode(int *blendMode)
  2127 {
  2128     SDL_Renderer *renderer;
  2129 
  2130     if (!_this) {
  2131         SDL_UninitializedVideo();
  2132         return -1;
  2133     }
  2134     renderer = SDL_CurrentDisplay.current_renderer;
  2135     if (!renderer) {
  2136         return -1;
  2137     }
  2138     *blendMode = renderer->blendMode;
  2139     return 0;
  2140 }
  2141 
  2142 int
  2143 SDL_RenderPoint(int x, int y)
  2144 {
  2145     SDL_Renderer *renderer;
  2146     SDL_Window *window;
  2147 
  2148     if (!_this) {
  2149         SDL_UninitializedVideo();
  2150         return -1;
  2151     }
  2152     renderer = SDL_CurrentDisplay.current_renderer;
  2153     if (!renderer) {
  2154         return -1;
  2155     }
  2156     if (!renderer->RenderPoint) {
  2157         SDL_Unsupported();
  2158         return -1;
  2159     }
  2160     window = SDL_GetWindowFromID(renderer->window);
  2161     if (x < 0 || y < 0 || x >= window->w || y >= window->h) {
  2162         return 0;
  2163     }
  2164     return renderer->RenderPoint(renderer, x, y);
  2165 }
  2166 
  2167 int
  2168 SDL_RenderLine(int x1, int y1, int x2, int y2)
  2169 {
  2170     SDL_Renderer *renderer;
  2171     SDL_Window *window;
  2172     SDL_Rect real_rect;
  2173 
  2174     if (x1 == x2 && y1 == y2) {
  2175         return SDL_RenderPoint(x1, y1);
  2176     }
  2177 
  2178     if (!_this) {
  2179         SDL_UninitializedVideo();
  2180         return -1;
  2181     }
  2182     renderer = SDL_CurrentDisplay.current_renderer;
  2183     if (!renderer) {
  2184         return -1;
  2185     }
  2186     if (!renderer->RenderLine) {
  2187         SDL_Unsupported();
  2188         return -1;
  2189     }
  2190     window = SDL_GetWindowFromID(renderer->window);
  2191 
  2192     real_rect.x = 0;
  2193     real_rect.y = 0;
  2194     real_rect.w = window->w;
  2195     real_rect.h = window->h;
  2196     if (!SDL_IntersectRectAndLine(&real_rect, &x1, &y1, &x2, &y2)) {
  2197         return (0);
  2198     }
  2199     return renderer->RenderLine(renderer, x1, y1, x2, y2);
  2200 }
  2201 
  2202 int
  2203 SDL_RenderFill(const SDL_Rect * rect)
  2204 {
  2205     SDL_Renderer *renderer;
  2206     SDL_Window *window;
  2207     SDL_Rect real_rect;
  2208 
  2209     if (!_this) {
  2210         SDL_UninitializedVideo();
  2211         return -1;
  2212     }
  2213     renderer = SDL_CurrentDisplay.current_renderer;
  2214     if (!renderer) {
  2215         return -1;
  2216     }
  2217     if (!renderer->RenderFill) {
  2218         SDL_Unsupported();
  2219         return -1;
  2220     }
  2221     window = SDL_GetWindowFromID(renderer->window);
  2222 
  2223     real_rect.x = 0;
  2224     real_rect.y = 0;
  2225     real_rect.w = window->w;
  2226     real_rect.h = window->h;
  2227     if (rect) {
  2228         if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
  2229             return 0;
  2230         }
  2231     }
  2232     return renderer->RenderFill(renderer, &real_rect);
  2233 }
  2234 
  2235 int
  2236 SDL_RenderCopy(SDL_TextureID textureID, const SDL_Rect * srcrect,
  2237                const SDL_Rect * dstrect)
  2238 {
  2239     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2240     SDL_Renderer *renderer;
  2241     SDL_Window *window;
  2242     SDL_Rect real_srcrect;
  2243     SDL_Rect real_dstrect;
  2244 
  2245     if (!texture || texture->renderer != SDL_CurrentDisplay.current_renderer) {
  2246         return -1;
  2247     }
  2248     renderer = SDL_CurrentDisplay.current_renderer;
  2249     if (!renderer) {
  2250         return -1;
  2251     }
  2252     if (!renderer->RenderCopy) {
  2253         SDL_Unsupported();
  2254         return -1;
  2255     }
  2256     window = SDL_GetWindowFromID(renderer->window);
  2257 
  2258     real_srcrect.x = 0;
  2259     real_srcrect.y = 0;
  2260     real_srcrect.w = texture->w;
  2261     real_srcrect.h = texture->h;
  2262     if (srcrect) {
  2263         if (!SDL_IntersectRect(srcrect, &real_srcrect, &real_srcrect)) {
  2264             return 0;
  2265         }
  2266     }
  2267 
  2268     real_dstrect.x = 0;
  2269     real_dstrect.y = 0;
  2270     real_dstrect.w = window->w;
  2271     real_dstrect.h = window->h;
  2272     if (dstrect) {
  2273         if (!SDL_IntersectRect(dstrect, &real_dstrect, &real_dstrect)) {
  2274             return 0;
  2275         }
  2276         /* Clip srcrect by the same amount as dstrect was clipped */
  2277         if (dstrect->w != real_dstrect.w) {
  2278             int deltax = (real_dstrect.x - dstrect->x);
  2279             int deltaw = (real_dstrect.w - dstrect->w);
  2280             real_srcrect.x += (deltax * dstrect->w) / real_srcrect.w;
  2281             real_srcrect.w += (deltaw * dstrect->w) / real_srcrect.w;
  2282         }
  2283         if (dstrect->h != real_dstrect.h) {
  2284             int deltay = (real_dstrect.y - dstrect->y);
  2285             int deltah = (real_dstrect.h - dstrect->h);
  2286             real_srcrect.y += (deltay * dstrect->h) / real_srcrect.h;
  2287             real_srcrect.h += (deltah * dstrect->h) / real_srcrect.h;
  2288         }
  2289     }
  2290 
  2291     return renderer->RenderCopy(renderer, texture, &real_srcrect,
  2292                                 &real_dstrect);
  2293 }
  2294 
  2295 void
  2296 SDL_RenderPresent(void)
  2297 {
  2298     SDL_Renderer *renderer;
  2299 
  2300     if (!_this) {
  2301         SDL_UninitializedVideo();
  2302         return;
  2303     }
  2304     renderer = SDL_CurrentDisplay.current_renderer;
  2305     if (!renderer || !renderer->RenderPresent) {
  2306         return;
  2307     }
  2308     renderer->RenderPresent(renderer);
  2309 }
  2310 
  2311 void
  2312 SDL_DestroyTexture(SDL_TextureID textureID)
  2313 {
  2314     int hash;
  2315     SDL_Texture *prev, *texture;
  2316     SDL_Renderer *renderer;
  2317 
  2318     if (!_this) {
  2319         SDL_UninitializedVideo();
  2320         return;
  2321     }
  2322     /* Look up the texture in the hash table */
  2323     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  2324     prev = NULL;
  2325     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  2326          prev = texture, texture = texture->next) {
  2327         if (texture->id == textureID) {
  2328             break;
  2329         }
  2330     }
  2331     if (!texture) {
  2332         return;
  2333     }
  2334     /* Unlink the texture from the list */
  2335     if (prev) {
  2336         prev->next = texture->next;
  2337     } else {
  2338         SDL_CurrentDisplay.textures[hash] = texture->next;
  2339     }
  2340 
  2341     /* Free the texture */
  2342     renderer = texture->renderer;
  2343     renderer->DestroyTexture(renderer, texture);
  2344     SDL_free(texture);
  2345 }
  2346 
  2347 void
  2348 SDL_DestroyRenderer(SDL_WindowID windowID)
  2349 {
  2350     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2351     SDL_Renderer *renderer;
  2352     int i;
  2353 
  2354     if (!window) {
  2355         return;
  2356     }
  2357     renderer = window->renderer;
  2358     if (!renderer) {
  2359         return;
  2360     }
  2361     /* Free existing textures for this renderer */
  2362     for (i = 0; i < SDL_arraysize(SDL_CurrentDisplay.textures); ++i) {
  2363         SDL_Texture *texture;
  2364         SDL_Texture *prev = NULL;
  2365         SDL_Texture *next;
  2366         for (texture = SDL_CurrentDisplay.textures[i]; texture;
  2367              texture = next) {
  2368             next = texture->next;
  2369             if (texture->renderer == renderer) {
  2370                 if (prev) {
  2371                     prev->next = next;
  2372                 } else {
  2373                     SDL_CurrentDisplay.textures[i] = next;
  2374                 }
  2375                 renderer->DestroyTexture(renderer, texture);
  2376                 SDL_free(texture);
  2377             } else {
  2378                 prev = texture;
  2379             }
  2380         }
  2381     }
  2382 
  2383     /* Free the renderer instance */
  2384     renderer->DestroyRenderer(renderer);
  2385 
  2386     /* Clear references */
  2387     window->renderer = NULL;
  2388     if (SDL_CurrentDisplay.current_renderer == renderer) {
  2389         SDL_CurrentDisplay.current_renderer = NULL;
  2390     }
  2391 }
  2392 
  2393 SDL_bool
  2394 SDL_IsScreenSaverEnabled()
  2395 {
  2396     if (!_this) {
  2397         return SDL_TRUE;
  2398     }
  2399     return _this->suspend_screensaver ? SDL_FALSE : SDL_TRUE;
  2400 }
  2401 
  2402 void
  2403 SDL_EnableScreenSaver()
  2404 {
  2405     if (!_this) {
  2406         return;
  2407     }
  2408     if (!_this->suspend_screensaver) {
  2409         return;
  2410     }
  2411     _this->suspend_screensaver = SDL_FALSE;
  2412     if (_this->SuspendScreenSaver) {
  2413         _this->SuspendScreenSaver(_this);
  2414     }
  2415 }
  2416 
  2417 void
  2418 SDL_DisableScreenSaver()
  2419 {
  2420     if (!_this) {
  2421         return;
  2422     }
  2423     if (_this->suspend_screensaver) {
  2424         return;
  2425     }
  2426     _this->suspend_screensaver = SDL_TRUE;
  2427     if (_this->SuspendScreenSaver) {
  2428         _this->SuspendScreenSaver(_this);
  2429     }
  2430 }
  2431 
  2432 void
  2433 SDL_VideoQuit(void)
  2434 {
  2435     int i, j;
  2436 
  2437     if (!_this) {
  2438         return;
  2439     }
  2440     /* Halt event processing before doing anything else */
  2441     SDL_StopEventLoop();
  2442     SDL_EnableScreenSaver();
  2443 
  2444     /* Clean up the system video */
  2445     for (i = _this->num_displays; i--;) {
  2446         SDL_VideoDisplay *display = &_this->displays[i];
  2447         for (j = display->num_windows; j--;) {
  2448             SDL_DestroyWindow(display->windows[i].id);
  2449         }
  2450         if (display->windows) {
  2451             SDL_free(display->windows);
  2452             display->windows = NULL;
  2453         }
  2454         display->num_windows = 0;
  2455         if (display->render_drivers) {
  2456             SDL_free(display->render_drivers);
  2457             display->render_drivers = NULL;
  2458         }
  2459         display->num_render_drivers = 0;
  2460     }
  2461     _this->VideoQuit(_this);
  2462 
  2463     for (i = _this->num_displays; i--;) {
  2464         SDL_VideoDisplay *display = &_this->displays[i];
  2465         for (j = display->num_display_modes; j--;) {
  2466             if (display->display_modes[j].driverdata) {
  2467                 SDL_free(display->display_modes[j].driverdata);
  2468                 display->display_modes[j].driverdata = NULL;
  2469             }
  2470         }
  2471         if (display->display_modes) {
  2472             SDL_free(display->display_modes);
  2473             display->display_modes = NULL;
  2474         }
  2475         if (display->desktop_mode.driverdata) {
  2476             SDL_free(display->desktop_mode.driverdata);
  2477             display->desktop_mode.driverdata = NULL;
  2478         }
  2479         if (display->palette) {
  2480             SDL_FreePalette(display->palette);
  2481             display->palette = NULL;
  2482         }
  2483         if (display->gamma) {
  2484             SDL_free(display->gamma);
  2485             display->gamma = NULL;
  2486         }
  2487         if (display->driverdata) {
  2488             SDL_free(display->driverdata);
  2489             display->driverdata = NULL;
  2490         }
  2491     }
  2492     if (_this->displays) {
  2493         SDL_free(_this->displays);
  2494         _this->displays = NULL;
  2495     }
  2496     _this->free(_this);
  2497     _this = NULL;
  2498 }
  2499 
  2500 int
  2501 SDL_GL_LoadLibrary(const char *path)
  2502 {
  2503     int retval;
  2504 
  2505     if (!_this) {
  2506         SDL_UninitializedVideo();
  2507         return -1;
  2508     }
  2509     if (_this->gl_config.driver_loaded) {
  2510         if (path && SDL_strcmp(path, _this->gl_config.driver_path) != 0) {
  2511             SDL_SetError("OpenGL library already loaded");
  2512             return -1;
  2513         }
  2514         retval = 0;
  2515     } else {
  2516         if (!_this->GL_LoadLibrary) {
  2517             SDL_SetError("No dynamic GL support in video driver");
  2518             return -1;
  2519         }
  2520         retval = _this->GL_LoadLibrary(_this, path);
  2521     }
  2522     if (retval == 0) {
  2523         ++_this->gl_config.driver_loaded;
  2524     }
  2525     return (retval);
  2526 }
  2527 
  2528 void *
  2529 SDL_GL_GetProcAddress(const char *proc)
  2530 {
  2531     void *func;
  2532 
  2533     if (!_this) {
  2534         SDL_UninitializedVideo();
  2535         return NULL;
  2536     }
  2537     func = NULL;
  2538     if (_this->GL_GetProcAddress) {
  2539         if (_this->gl_config.driver_loaded) {
  2540             func = _this->GL_GetProcAddress(_this, proc);
  2541         } else {
  2542             SDL_SetError("No GL driver has been loaded");
  2543         }
  2544     } else {
  2545         SDL_SetError("No dynamic GL support in video driver");
  2546     }
  2547     return func;
  2548 }
  2549 
  2550 void
  2551 SDL_GL_UnloadLibrary(void)
  2552 {
  2553     if (!_this) {
  2554         SDL_UninitializedVideo();
  2555         return;
  2556     }
  2557     if (_this->gl_config.driver_loaded > 0) {
  2558         if (--_this->gl_config.driver_loaded > 0) {
  2559             return;
  2560         }
  2561         if (_this->GL_UnloadLibrary) {
  2562             _this->GL_UnloadLibrary(_this);
  2563         }
  2564     }
  2565 }
  2566 
  2567 SDL_bool
  2568 SDL_GL_ExtensionSupported(const char *extension)
  2569 {
  2570 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2571     const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
  2572     const char *extensions;
  2573     const char *start;
  2574     const char *where, *terminator;
  2575 
  2576     /* Extension names should not have spaces. */
  2577     where = SDL_strchr(extension, ' ');
  2578     if (where || *extension == '\0') {
  2579         return SDL_FALSE;
  2580     }
  2581     /* See if there's an environment variable override */
  2582     start = SDL_getenv(extension);
  2583     if (start && *start == '0') {
  2584         return SDL_FALSE;
  2585     }
  2586     /* Lookup the available extensions */
  2587     glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
  2588     if (glGetStringFunc) {
  2589         extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
  2590     } else {
  2591         extensions = NULL;
  2592     }
  2593     if (!extensions) {
  2594         return SDL_FALSE;
  2595     }
  2596     /*
  2597      * It takes a bit of care to be fool-proof about parsing the OpenGL
  2598      * extensions string. Don't be fooled by sub-strings, etc.
  2599      */
  2600 
  2601     start = extensions;
  2602 
  2603     for (;;) {
  2604         where = SDL_strstr(start, extension);
  2605         if (!where)
  2606             break;
  2607 
  2608         terminator = where + SDL_strlen(extension);
  2609         if (where == start || *(where - 1) == ' ')
  2610             if (*terminator == ' ' || *terminator == '\0')
  2611                 return SDL_TRUE;
  2612 
  2613         start = terminator;
  2614     }
  2615     return SDL_FALSE;
  2616 #else
  2617     return SDL_FALSE;
  2618 #endif
  2619 }
  2620 
  2621 int
  2622 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
  2623 {
  2624 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2625     int retval;
  2626 
  2627     if (!_this) {
  2628         SDL_UninitializedVideo();
  2629         return -1;
  2630     }
  2631     retval = 0;
  2632     switch (attr) {
  2633     case SDL_GL_RED_SIZE:
  2634         _this->gl_config.red_size = value;
  2635         break;
  2636     case SDL_GL_GREEN_SIZE:
  2637         _this->gl_config.green_size = value;
  2638         break;
  2639     case SDL_GL_BLUE_SIZE:
  2640         _this->gl_config.blue_size = value;
  2641         break;
  2642     case SDL_GL_ALPHA_SIZE:
  2643         _this->gl_config.alpha_size = value;
  2644         break;
  2645     case SDL_GL_DOUBLEBUFFER:
  2646         _this->gl_config.double_buffer = value;
  2647         break;
  2648     case SDL_GL_BUFFER_SIZE:
  2649         _this->gl_config.buffer_size = value;
  2650         break;
  2651     case SDL_GL_DEPTH_SIZE:
  2652         _this->gl_config.depth_size = value;
  2653         break;
  2654     case SDL_GL_STENCIL_SIZE:
  2655         _this->gl_config.stencil_size = value;
  2656         break;
  2657     case SDL_GL_ACCUM_RED_SIZE:
  2658         _this->gl_config.accum_red_size = value;
  2659         break;
  2660     case SDL_GL_ACCUM_GREEN_SIZE:
  2661         _this->gl_config.accum_green_size = value;
  2662         break;
  2663     case SDL_GL_ACCUM_BLUE_SIZE:
  2664         _this->gl_config.accum_blue_size = value;
  2665         break;
  2666     case SDL_GL_ACCUM_ALPHA_SIZE:
  2667         _this->gl_config.accum_alpha_size = value;
  2668         break;
  2669     case SDL_GL_STEREO:
  2670         _this->gl_config.stereo = value;
  2671         break;
  2672     case SDL_GL_MULTISAMPLEBUFFERS:
  2673         _this->gl_config.multisamplebuffers = value;
  2674         break;
  2675     case SDL_GL_MULTISAMPLESAMPLES:
  2676         _this->gl_config.multisamplesamples = value;
  2677         break;
  2678     case SDL_GL_ACCELERATED_VISUAL:
  2679         _this->gl_config.accelerated = value;
  2680         break;
  2681     case SDL_GL_RETAINED_BACKING:
  2682         _this->gl_config.retained_backing = value;
  2683         break;
  2684     default:
  2685         SDL_SetError("Unknown OpenGL attribute");
  2686         retval = -1;
  2687         break;
  2688     }
  2689     return retval;
  2690 #else
  2691     SDL_Unsupported();
  2692     return -1;
  2693 #endif /* SDL_VIDEO_OPENGL */
  2694 }
  2695 
  2696 int
  2697 SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
  2698 {
  2699 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2700     void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2701     GLenum attrib = 0;
  2702 
  2703     glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2704     if (!glGetIntegervFunc) {
  2705         return -1;
  2706     }
  2707     switch (attr) {
  2708     case SDL_GL_RETAINED_BACKING:
  2709         *value = _this->gl_config.retained_backing;
  2710         return 0;
  2711     case SDL_GL_RED_SIZE:
  2712         attrib = GL_RED_BITS;
  2713         break;
  2714     case SDL_GL_BLUE_SIZE:
  2715         attrib = GL_BLUE_BITS;
  2716         break;
  2717     case SDL_GL_GREEN_SIZE:
  2718         attrib = GL_GREEN_BITS;
  2719         break;
  2720     case SDL_GL_ALPHA_SIZE:
  2721         attrib = GL_ALPHA_BITS;
  2722         break;
  2723     case SDL_GL_DOUBLEBUFFER:
  2724 #ifndef SDL_VIDEO_OPENGL_ES
  2725         attrib = GL_DOUBLEBUFFER;
  2726         break;
  2727 #else
  2728         /*
  2729          * I believe double buffering is the only option in OpenGL ES
  2730          * -- in any case, GL_DOUBLEBUFFER doesn't exist
  2731          */
  2732         *value = 1;
  2733         return 0;
  2734 #endif
  2735     case SDL_GL_DEPTH_SIZE:
  2736         attrib = GL_DEPTH_BITS;
  2737         break;
  2738     case SDL_GL_STENCIL_SIZE:
  2739         attrib = GL_STENCIL_BITS;
  2740         break;
  2741 #ifndef SDL_VIDEO_OPENGL_ES
  2742     case SDL_GL_ACCUM_RED_SIZE:
  2743         attrib = GL_ACCUM_RED_BITS;
  2744         break;
  2745     case SDL_GL_ACCUM_GREEN_SIZE:
  2746         attrib = GL_ACCUM_GREEN_BITS;
  2747         break;
  2748     case SDL_GL_ACCUM_BLUE_SIZE:
  2749         attrib = GL_ACCUM_BLUE_BITS;
  2750         break;
  2751     case SDL_GL_ACCUM_ALPHA_SIZE:
  2752         attrib = GL_ACCUM_ALPHA_BITS;
  2753         break;
  2754     case SDL_GL_STEREO:
  2755         attrib = GL_STEREO;
  2756         break;
  2757 #else
  2758     case SDL_GL_ACCUM_RED_SIZE:
  2759     case SDL_GL_ACCUM_GREEN_SIZE:
  2760     case SDL_GL_ACCUM_BLUE_SIZE:
  2761     case SDL_GL_ACCUM_ALPHA_SIZE:
  2762     case SDL_GL_STEREO:
  2763         /* none of these are supported in OpenGL ES */
  2764         *value = 0;
  2765         return 0;
  2766 #endif
  2767     case SDL_GL_MULTISAMPLEBUFFERS:
  2768 #ifndef SDL_VIDEO_OPENGL_ES
  2769         attrib = GL_SAMPLE_BUFFERS_ARB;
  2770 #else
  2771         attrib = GL_SAMPLE_BUFFERS;
  2772 #endif
  2773         break;
  2774     case SDL_GL_MULTISAMPLESAMPLES:
  2775 #ifndef SDL_VIDEO_OPENGL_ES
  2776         attrib = GL_SAMPLES_ARB;
  2777 #else
  2778         attrib = GL_SAMPLES;
  2779 #endif
  2780         break;
  2781     case SDL_GL_BUFFER_SIZE:
  2782         {
  2783             GLint bits = 0;
  2784             GLint component;
  2785 
  2786             /*
  2787              * there doesn't seem to be a single flag in OpenGL
  2788              * for this!
  2789              */
  2790             glGetIntegervFunc(GL_RED_BITS, &component);
  2791             bits += component;
  2792             glGetIntegervFunc(GL_GREEN_BITS, &component);
  2793             bits += component;
  2794             glGetIntegervFunc(GL_BLUE_BITS, &component);
  2795             bits += component;
  2796             glGetIntegervFunc(GL_ALPHA_BITS, &component);
  2797             bits += component;
  2798 
  2799             *value = bits;
  2800             return 0;
  2801         }
  2802     case SDL_GL_ACCELERATED_VISUAL:
  2803         {
  2804             /* FIXME: How do we get this information? */
  2805             *value = (_this->gl_config.accelerated != 0);
  2806             return 0;
  2807         }
  2808     default:
  2809         SDL_SetError("Unknown OpenGL attribute");
  2810         return -1;
  2811     }
  2812 
  2813     glGetIntegervFunc(attrib, (GLint *) value);
  2814     return 0;
  2815 #else
  2816     SDL_Unsupported();
  2817     return -1;
  2818 #endif /* SDL_VIDEO_OPENGL */
  2819 }
  2820 
  2821 SDL_GLContext
  2822 SDL_GL_CreateContext(SDL_WindowID windowID)
  2823 {
  2824     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2825 
  2826     if (!window) {
  2827         return NULL;
  2828     }
  2829     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2830         SDL_SetError("The specified window isn't an OpenGL window");
  2831         return NULL;
  2832     }
  2833     return _this->GL_CreateContext(_this, window);
  2834 }
  2835 
  2836 int
  2837 SDL_GL_MakeCurrent(SDL_WindowID windowID, SDL_GLContext context)
  2838 {
  2839     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2840 
  2841     if (window && !(window->flags & SDL_WINDOW_OPENGL)) {
  2842         SDL_SetError("The specified window isn't an OpenGL window");
  2843         return -1;
  2844     }
  2845     if (!context) {
  2846         window = NULL;
  2847     }
  2848     return _this->GL_MakeCurrent(_this, window, context);
  2849 }
  2850 
  2851 int
  2852 SDL_GL_SetSwapInterval(int interval)
  2853 {
  2854     if (!_this) {
  2855         SDL_UninitializedVideo();
  2856         return -1;
  2857     }
  2858     if (_this->GL_SetSwapInterval) {
  2859         return _this->GL_SetSwapInterval(_this, interval);
  2860     } else {
  2861         SDL_SetError("Setting the swap interval is not supported");
  2862         return -1;
  2863     }
  2864 }
  2865 
  2866 int
  2867 SDL_GL_GetSwapInterval(void)
  2868 {
  2869     if (!_this) {
  2870         SDL_UninitializedVideo();
  2871         return -1;
  2872     }
  2873     if (_this->GL_GetSwapInterval) {
  2874         return _this->GL_GetSwapInterval(_this);
  2875     } else {
  2876         SDL_SetError("Getting the swap interval is not supported");
  2877         return -1;
  2878     }
  2879 }
  2880 
  2881 void
  2882 SDL_GL_SwapWindow(SDL_WindowID windowID)
  2883 {
  2884     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2885 
  2886     if (!window) {
  2887         return;
  2888     }
  2889     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2890         SDL_SetError("The specified window isn't an OpenGL window");
  2891         return;
  2892     }
  2893     _this->GL_SwapWindow(_this, window);
  2894 }
  2895 
  2896 void
  2897 SDL_GL_DeleteContext(SDL_GLContext context)
  2898 {
  2899     if (!_this || !context) {
  2900         return;
  2901     }
  2902     _this->GL_MakeCurrent(_this, NULL, NULL);
  2903     _this->GL_DeleteContext(_this, context);
  2904 }
  2905 
  2906 #if 0                           // FIXME
  2907 /*
  2908  * Utility function used by SDL_WM_SetIcon(); flags & 1 for color key, flags
  2909  * & 2 for alpha channel.
  2910  */
  2911 static void
  2912 CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
  2913 {
  2914     int x, y;
  2915     Uint32 colorkey;
  2916 #define SET_MASKBIT(icon, x, y, mask) \
  2917 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  2918 
  2919     colorkey = icon->format->colorkey;
  2920     switch (icon->format->BytesPerPixel) {
  2921     case 1:
  2922         {
  2923             Uint8 *pixels;
  2924             for (y = 0; y < icon->h; ++y) {
  2925                 pixels = (Uint8 *) icon->pixels + y * icon->pitch;
  2926                 for (x = 0; x < icon->w; ++x) {
  2927                     if (*pixels++ == colorkey) {
  2928                         SET_MASKBIT(icon, x, y, mask);
  2929                     }
  2930                 }
  2931             }
  2932         }
  2933         break;
  2934 
  2935     case 2:
  2936         {
  2937             Uint16 *pixels;
  2938             for (y = 0; y < icon->h; ++y) {
  2939                 pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
  2940                 for (x = 0; x < icon->w; ++x) {
  2941                     if ((flags & 1) && *pixels == colorkey) {
  2942                         SET_MASKBIT(icon, x, y, mask);
  2943                     } else if ((flags & 2)
  2944                                && (*pixels & icon->format->Amask) == 0) {
  2945                         SET_MASKBIT(icon, x, y, mask);
  2946                     }
  2947                     pixels++;
  2948                 }
  2949             }
  2950         }
  2951         break;
  2952 
  2953     case 4:
  2954         {
  2955             Uint32 *pixels;
  2956             for (y = 0; y < icon->h; ++y) {
  2957                 pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
  2958                 for (x = 0; x < icon->w; ++x) {
  2959                     if ((flags & 1) && *pixels == colorkey) {
  2960                         SET_MASKBIT(icon, x, y, mask);
  2961                     } else if ((flags & 2)
  2962                                && (*pixels & icon->format->Amask) == 0) {
  2963                         SET_MASKBIT(icon, x, y, mask);
  2964                     }
  2965                     pixels++;
  2966                 }
  2967             }
  2968         }
  2969         break;
  2970     }
  2971 }
  2972 
  2973 /*
  2974  * Sets the window manager icon for the display window.
  2975  */
  2976 void
  2977 SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
  2978 {
  2979     if (icon && _this->SetIcon) {
  2980         /* Generate a mask if necessary, and create the icon! */
  2981         if (mask == NULL) {
  2982             int mask_len = icon->h * (icon->w + 7) / 8;
  2983             int flags = 0;
  2984             mask = (Uint8 *) SDL_malloc(mask_len);
  2985             if (mask == NULL) {
  2986                 return;
  2987             }
  2988             SDL_memset(mask, ~0, mask_len);
  2989             if (icon->flags & SDL_SRCCOLORKEY)
  2990                 flags |= 1;
  2991             if (icon->flags & SDL_SRCALPHA)
  2992                 flags |= 2;
  2993             if (flags) {
  2994                 CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  2995             }
  2996             _this->SetIcon(_this, icon, mask);
  2997             SDL_free(mask);
  2998         } else {
  2999             _this->SetIcon(_this, icon, mask);
  3000         }
  3001     }
  3002 }
  3003 #endif
  3004 
  3005 SDL_bool
  3006 SDL_GetWindowWMInfo(SDL_WindowID windowID, struct SDL_SysWMinfo *info)
  3007 {
  3008     SDL_Window *window = SDL_GetWindowFromID(windowID);
  3009 
  3010     if (!window || !_this->GetWindowWMInfo) {
  3011         return SDL_FALSE;
  3012     }
  3013     return (_this->GetWindowWMInfo(_this, window, info));
  3014 }
  3015 
  3016 /* vi: set ts=4 sw=4 expandtab: */