src/video/SDL_video.c
author Bob Pendleton <bob@pendleton.com>
Fri, 14 Mar 2008 18:17:49 +0000
changeset 2328 91e601d9df8b
parent 2324 3202e4826c57
child 2357 ad4a291c85ab
child 2540 56cf872c723a
child 2669 e27bdcc80744
permissions -rw-r--r--
re: bug#563. checking in some commented out trace code and a fix so that the in testalpha.c the background only flashes when alpha == 255. The problem that is being
fixed is caused by clearing SDL_COPY_RLE_COLORKEY without setting SDL_COPY_RLE_DESIRED in SDL_UnRELSurface.
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2006 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 #include "SDL_config.h"
    23 
    24 /* The high-level video driver subsystem */
    25 
    26 #include "SDL.h"
    27 #include "SDL_sysvideo.h"
    28 #include "SDL_blit.h"
    29 #include "SDL_pixels_c.h"
    30 #include "SDL_renderer_gl.h"
    31 #include "SDL_renderer_sw.h"
    32 #include "../events/SDL_sysevents.h"
    33 #include "../events/SDL_events_c.h"
    34 
    35 #if SDL_VIDEO_OPENGL
    36 #include "SDL_opengl.h"
    37 
    38 /* On Windows, windows.h defines CreateWindow */
    39 #ifdef CreateWindow
    40 #undef CreateWindow
    41 #endif
    42 #endif /* SDL_VIDEO_OPENGL */
    43 
    44 /* Available video drivers */
    45 static VideoBootStrap *bootstrap[] = {
    46 #if SDL_VIDEO_DRIVER_COCOA
    47     &COCOA_bootstrap,
    48 #endif
    49 #if SDL_VIDEO_DRIVER_X11
    50     &X11_bootstrap,
    51 #endif
    52 #if SDL_VIDEO_DRIVER_NANOX
    53     &NX_bootstrap,
    54 #endif
    55 #if SDL_VIDEO_DRIVER_IPOD
    56     &iPod_bootstrap,
    57 #endif
    58 #if SDL_VIDEO_DRIVER_WSCONS
    59     &WSCONS_bootstrap,
    60 #endif
    61 #if SDL_VIDEO_DRIVER_FBCON
    62     &FBCON_bootstrap,
    63 #endif
    64 #if SDL_VIDEO_DRIVER_DIRECTFB
    65     &DirectFB_bootstrap,
    66 #endif
    67 #if SDL_VIDEO_DRIVER_PS2GS
    68     &PS2GS_bootstrap,
    69 #endif
    70 #if SDL_VIDEO_DRIVER_VGL
    71     &VGL_bootstrap,
    72 #endif
    73 #if SDL_VIDEO_DRIVER_SVGALIB
    74     &SVGALIB_bootstrap,
    75 #endif
    76 #if SDL_VIDEO_DRIVER_GAPI
    77     &GAPI_bootstrap,
    78 #endif
    79 #if SDL_VIDEO_DRIVER_WIN32
    80     &WIN32_bootstrap,
    81 #endif
    82 #if SDL_VIDEO_DRIVER_BWINDOW
    83     &BWINDOW_bootstrap,
    84 #endif
    85 #if SDL_VIDEO_DRIVER_PHOTON
    86     &ph_bootstrap,
    87 #endif
    88 #if SDL_VIDEO_DRIVER_EPOC
    89     &EPOC_bootstrap,
    90 #endif
    91 #if SDL_VIDEO_DRIVER_XBIOS
    92     &XBIOS_bootstrap,
    93 #endif
    94 #if SDL_VIDEO_DRIVER_GEM
    95     &GEM_bootstrap,
    96 #endif
    97 #if SDL_VIDEO_DRIVER_DC
    98     &DC_bootstrap,
    99 #endif
   100 #if SDL_VIDEO_DRIVER_RISCOS
   101     &RISCOS_bootstrap,
   102 #endif
   103 #if SDL_VIDEO_DRIVER_OS2FS
   104     &OS2FSLib_bootstrap,
   105 #endif
   106 #if SDL_VIDEO_DRIVER_DUMMY
   107     &DUMMY_bootstrap,
   108 #endif
   109     NULL
   110 };
   111 
   112 static SDL_VideoDevice *_this = NULL;
   113 
   114 /* Various local functions */
   115 int SDL_VideoInit(const char *driver_name, Uint32 flags);
   116 void SDL_VideoQuit(void);
   117 
   118 static int
   119 cmpmodes(const void *A, const void *B)
   120 {
   121     SDL_DisplayMode a = *(const SDL_DisplayMode *) A;
   122     SDL_DisplayMode b = *(const SDL_DisplayMode *) B;
   123 
   124     if (a.w != b.w) {
   125         return b.w - a.w;
   126     }
   127     if (a.h != b.h) {
   128         return b.h - a.h;
   129     }
   130     if (SDL_BITSPERPIXEL(a.format) != SDL_BITSPERPIXEL(b.format)) {
   131         return SDL_BITSPERPIXEL(b.format) - SDL_BITSPERPIXEL(a.format);
   132     }
   133     if (a.refresh_rate != b.refresh_rate) {
   134         return b.refresh_rate - a.refresh_rate;
   135     }
   136     return 0;
   137 }
   138 
   139 static void
   140 SDL_UninitializedVideo()
   141 {
   142     SDL_SetError("Video subsystem has not been initialized");
   143 }
   144 
   145 int
   146 SDL_GetNumVideoDrivers(void)
   147 {
   148     return SDL_arraysize(bootstrap) - 1;
   149 }
   150 
   151 const char *
   152 SDL_GetVideoDriver(int index)
   153 {
   154     if (index >= 0 && index < SDL_GetNumVideoDrivers()) {
   155         return bootstrap[index]->name;
   156     }
   157     return NULL;
   158 }
   159 
   160 /*
   161  * Initialize the video and event subsystems -- determine native pixel format
   162  */
   163 int
   164 SDL_VideoInit(const char *driver_name, Uint32 flags)
   165 {
   166     SDL_VideoDevice *video;
   167     int index;
   168     int i;
   169 
   170     /* Toggle the event thread flags, based on OS requirements */
   171 #if defined(MUST_THREAD_EVENTS)
   172     flags |= SDL_INIT_EVENTTHREAD;
   173 #elif defined(CANT_THREAD_EVENTS)
   174     if ((flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD) {
   175         SDL_SetError("OS doesn't support threaded events");
   176         return -1;
   177     }
   178 #endif
   179 
   180     /* Start the event loop */
   181     if (SDL_StartEventLoop(flags) < 0) {
   182         return -1;
   183     }
   184 
   185     /* Check to make sure we don't overwrite '_this' */
   186     if (_this != NULL) {
   187         SDL_VideoQuit();
   188     }
   189 
   190     /* Select the proper video driver */
   191     index = 0;
   192     video = NULL;
   193     if (driver_name == NULL) {
   194         driver_name = SDL_getenv("SDL_VIDEODRIVER");
   195     }
   196     if (driver_name != NULL) {
   197         for (i = 0; bootstrap[i]; ++i) {
   198             if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) {
   199                 if (bootstrap[i]->available()) {
   200                     video = bootstrap[i]->create(index);
   201                 }
   202                 break;
   203             }
   204         }
   205     } else {
   206         for (i = 0; bootstrap[i]; ++i) {
   207             if (bootstrap[i]->available()) {
   208                 video = bootstrap[i]->create(index);
   209                 if (video != NULL) {
   210                     break;
   211                 }
   212             }
   213         }
   214     }
   215     if (video == NULL) {
   216         if (driver_name) {
   217             SDL_SetError("%s not available", driver_name);
   218         } else {
   219             SDL_SetError("No available video device");
   220         }
   221         return -1;
   222     }
   223     _this = video;
   224     _this->name = bootstrap[i]->name;
   225     _this->next_object_id = 1;
   226 
   227 
   228     /* Set some very sane GL defaults */
   229     _this->gl_config.driver_loaded = 0;
   230     _this->gl_config.dll_handle = NULL;
   231     _this->gl_config.red_size = 3;
   232     _this->gl_config.green_size = 3;
   233     _this->gl_config.blue_size = 2;
   234     _this->gl_config.alpha_size = 0;
   235     _this->gl_config.buffer_size = 0;
   236     _this->gl_config.depth_size = 16;
   237     _this->gl_config.stencil_size = 0;
   238     _this->gl_config.double_buffer = 1;
   239     _this->gl_config.accum_red_size = 0;
   240     _this->gl_config.accum_green_size = 0;
   241     _this->gl_config.accum_blue_size = 0;
   242     _this->gl_config.accum_alpha_size = 0;
   243     _this->gl_config.stereo = 0;
   244     _this->gl_config.multisamplebuffers = 0;
   245     _this->gl_config.multisamplesamples = 0;
   246     _this->gl_config.accelerated = -1;  /* not known, don't set */
   247 
   248     /* Initialize the video subsystem */
   249     if (_this->VideoInit(_this) < 0) {
   250         SDL_VideoQuit();
   251         return -1;
   252     }
   253 
   254     /* Make sure some displays were added */
   255     if (_this->num_displays == 0) {
   256         SDL_SetError("The video driver did not add any displays");
   257         SDL_VideoQuit();
   258         return (-1);
   259     }
   260 
   261     /* The software renderer is always available */
   262     for (i = 0; i < _this->num_displays; ++i) {
   263 #if SDL_VIDEO_RENDER_OGL
   264         SDL_AddRenderDriver(i, &GL_RenderDriver);
   265 #endif
   266         if (_this->displays[i].num_render_drivers > 0) {
   267             SDL_AddRenderDriver(i, &SW_RenderDriver);
   268         }
   269     }
   270 
   271     /* We're ready to go! */
   272     return 0;
   273 }
   274 
   275 const char *
   276 SDL_GetCurrentVideoDriver()
   277 {
   278     if (!_this) {
   279         SDL_UninitializedVideo();
   280         return NULL;
   281     }
   282     return _this->name;
   283 }
   284 
   285 SDL_VideoDevice *
   286 SDL_GetVideoDevice()
   287 {
   288     return _this;
   289 }
   290 
   291 int
   292 SDL_AddBasicVideoDisplay(const SDL_DisplayMode * desktop_mode)
   293 {
   294     SDL_VideoDisplay display;
   295 
   296     SDL_zero(display);
   297     if (desktop_mode) {
   298         display.desktop_mode = *desktop_mode;
   299     }
   300     display.current_mode = display.desktop_mode;
   301 
   302     return SDL_AddVideoDisplay(&display);
   303 }
   304 
   305 int
   306 SDL_AddVideoDisplay(const SDL_VideoDisplay * display)
   307 {
   308     SDL_VideoDisplay *displays;
   309     int index = -1;
   310 
   311     displays =
   312         SDL_realloc(_this->displays,
   313                     (_this->num_displays + 1) * sizeof(*displays));
   314     if (displays) {
   315         index = _this->num_displays++;
   316         displays[index] = *display;
   317         displays[index].device = _this;
   318         _this->displays = displays;
   319     } else {
   320         SDL_OutOfMemory();
   321     }
   322     return index;
   323 }
   324 
   325 int
   326 SDL_GetNumVideoDisplays(void)
   327 {
   328     if (!_this) {
   329         SDL_UninitializedVideo();
   330         return 0;
   331     }
   332     return _this->num_displays;
   333 }
   334 
   335 int
   336 SDL_SelectVideoDisplay(int index)
   337 {
   338     if (!_this) {
   339         SDL_UninitializedVideo();
   340         return (-1);
   341     }
   342     if (index < 0 || index >= _this->num_displays) {
   343         SDL_SetError("index must be in the range 0 - %d",
   344                      _this->num_displays - 1);
   345         return -1;
   346     }
   347     _this->current_display = index;
   348     return 0;
   349 }
   350 
   351 int
   352 SDL_GetCurrentVideoDisplay(void)
   353 {
   354     if (!_this) {
   355         SDL_UninitializedVideo();
   356         return (-1);
   357     }
   358     return _this->current_display;
   359 }
   360 
   361 SDL_bool
   362 SDL_AddDisplayMode(int displayIndex, const SDL_DisplayMode * mode)
   363 {
   364     SDL_VideoDisplay *display = &_this->displays[displayIndex];
   365     SDL_DisplayMode *modes;
   366     int i, nmodes;
   367 
   368     /* Make sure we don't already have the mode in the list */
   369     modes = display->display_modes;
   370     nmodes = display->num_display_modes;
   371     for (i = nmodes; i--;) {
   372         if (SDL_memcmp(mode, &modes[i], sizeof(*mode)) == 0) {
   373             return SDL_FALSE;
   374         }
   375     }
   376 
   377     /* Go ahead and add the new mode */
   378     if (nmodes == display->max_display_modes) {
   379         modes =
   380             SDL_realloc(modes,
   381                         (display->max_display_modes + 32) * sizeof(*modes));
   382         if (!modes) {
   383             return SDL_FALSE;
   384         }
   385         display->display_modes = modes;
   386         display->max_display_modes += 32;
   387     }
   388     modes[nmodes] = *mode;
   389     display->num_display_modes++;
   390 
   391     return SDL_TRUE;
   392 }
   393 
   394 int
   395 SDL_GetNumDisplayModes()
   396 {
   397     if (_this) {
   398         SDL_VideoDisplay *display = &SDL_CurrentDisplay;
   399         if (!display->num_display_modes && _this->GetDisplayModes) {
   400             _this->GetDisplayModes(_this);
   401             SDL_qsort(display->display_modes, display->num_display_modes,
   402                       sizeof(SDL_DisplayMode), cmpmodes);
   403         }
   404         return display->num_display_modes;
   405     }
   406     return 0;
   407 }
   408 
   409 int
   410 SDL_GetDisplayMode(int index, SDL_DisplayMode * mode)
   411 {
   412     if (index < 0 || index >= SDL_GetNumDisplayModes()) {
   413         SDL_SetError("index must be in the range of 0 - %d",
   414                      SDL_GetNumDisplayModes() - 1);
   415         return -1;
   416     }
   417     if (mode) {
   418         *mode = SDL_CurrentDisplay.display_modes[index];
   419     }
   420     return 0;
   421 }
   422 
   423 int
   424 SDL_GetDesktopDisplayMode(SDL_DisplayMode * mode)
   425 {
   426     if (!_this) {
   427         SDL_UninitializedVideo();
   428         return -1;
   429     }
   430     if (mode) {
   431         *mode = SDL_CurrentDisplay.desktop_mode;
   432     }
   433     return 0;
   434 }
   435 
   436 int
   437 SDL_GetCurrentDisplayMode(SDL_DisplayMode * mode)
   438 {
   439     if (!_this) {
   440         SDL_UninitializedVideo();
   441         return -1;
   442     }
   443     if (mode) {
   444         *mode = SDL_CurrentDisplay.current_mode;
   445     }
   446     return 0;
   447 }
   448 
   449 SDL_DisplayMode *
   450 SDL_GetClosestDisplayMode(const SDL_DisplayMode * mode,
   451                           SDL_DisplayMode * closest)
   452 {
   453     Uint32 target_format;
   454     int target_refresh_rate;
   455     int i;
   456     SDL_DisplayMode *current, *match;
   457 
   458     if (!_this || !mode || !closest) {
   459         return NULL;
   460     }
   461 
   462     /* Default to the desktop format */
   463     if (mode->format) {
   464         target_format = mode->format;
   465     } else {
   466         target_format = SDL_CurrentDisplay.desktop_mode.format;
   467     }
   468 
   469     /* Default to the desktop refresh rate */
   470     if (mode->refresh_rate) {
   471         target_refresh_rate = mode->refresh_rate;
   472     } else {
   473         target_refresh_rate = SDL_CurrentDisplay.desktop_mode.refresh_rate;
   474     }
   475 
   476     match = NULL;
   477     for (i = 0; i < SDL_GetNumDisplayModes(); ++i) {
   478         current = &SDL_CurrentDisplay.display_modes[i];
   479 
   480         if ((current->w && current->h) &&
   481             (current->w < mode->w || current->h < mode->h)) {
   482             /* Out of sorted modes large enough here */
   483             break;
   484         }
   485         if (!match || current->w < match->w || current->h < match->h) {
   486             match = current;
   487             continue;
   488         }
   489         if (current->format != match->format) {
   490             /* Sorted highest depth to lowest */
   491             if (current->format == target_format ||
   492                 (SDL_BITSPERPIXEL(current->format) >=
   493                  SDL_BITSPERPIXEL(target_format)
   494                  && SDL_PIXELTYPE(current->format) ==
   495                  SDL_PIXELTYPE(target_format))) {
   496                 match = current;
   497             }
   498             continue;
   499         }
   500         if (current->refresh_rate != match->refresh_rate) {
   501             /* Sorted highest refresh to lowest */
   502             if (current->refresh_rate >= target_refresh_rate) {
   503                 match = current;
   504             }
   505         }
   506     }
   507     if (match) {
   508         if (match->format) {
   509             closest->format = match->format;
   510         } else {
   511             closest->format = mode->format;
   512         }
   513         if (match->w && match->h) {
   514             closest->w = match->w;
   515             closest->h = match->h;
   516         } else {
   517             closest->w = mode->w;
   518             closest->h = mode->h;
   519         }
   520         if (match->refresh_rate) {
   521             closest->refresh_rate = match->refresh_rate;
   522         } else {
   523             closest->refresh_rate = mode->refresh_rate;
   524         }
   525         closest->driverdata = match->driverdata;
   526 
   527         /* Pick some reasonable defaults if the app and driver don't care */
   528         if (!closest->format) {
   529             closest->format = SDL_PIXELFORMAT_RGB888;
   530         }
   531         if (!closest->w) {
   532             closest->w = 640;
   533         }
   534         if (!closest->h) {
   535             closest->h = 480;
   536         }
   537         return closest;
   538     }
   539     return NULL;
   540 }
   541 
   542 int
   543 SDL_SetDisplayMode(const SDL_DisplayMode * mode)
   544 {
   545     SDL_VideoDisplay *display;
   546     SDL_DisplayMode display_mode;
   547     SDL_DisplayMode current_mode;
   548     int i, ncolors;
   549 
   550     if (!_this) {
   551         SDL_UninitializedVideo();
   552         return -1;
   553     }
   554 
   555     display = &SDL_CurrentDisplay;
   556     if (!mode) {
   557         mode = &display->desktop_mode;
   558     }
   559     display_mode = *mode;
   560 
   561     /* Default to the current mode */
   562     if (!display_mode.format) {
   563         display_mode.format = display->current_mode.format;
   564     }
   565     if (!display_mode.w) {
   566         display_mode.w = display->current_mode.w;
   567     }
   568     if (!display_mode.h) {
   569         display_mode.h = display->current_mode.h;
   570     }
   571     if (!display_mode.refresh_rate) {
   572         display_mode.refresh_rate = display->current_mode.refresh_rate;
   573     }
   574 
   575     /* Get a good video mode, the closest one possible */
   576     if (!SDL_GetClosestDisplayMode(&display_mode, &display_mode)) {
   577         SDL_SetError("No video mode large enough for %dx%d",
   578                      display_mode.w, display_mode.h);
   579         return -1;
   580     }
   581 
   582     /* See if there's anything left to do */
   583     SDL_GetCurrentDisplayMode(&current_mode);
   584     if (SDL_memcmp(&display_mode, &current_mode, sizeof(display_mode)) == 0) {
   585         return 0;
   586     }
   587 
   588     /* Actually change the display mode */
   589     if (_this->SetDisplayMode(_this, &display_mode) < 0) {
   590         return -1;
   591     }
   592     display->current_mode = display_mode;
   593 
   594     /* Set up a palette, if necessary */
   595     if (SDL_ISPIXELFORMAT_INDEXED(display_mode.format)) {
   596         ncolors = (1 << SDL_BITSPERPIXEL(display_mode.format));
   597     } else {
   598         ncolors = 0;
   599     }
   600     if ((!ncolors && display->palette) || (ncolors && !display->palette)
   601         || (ncolors && ncolors != display->palette->ncolors)) {
   602         if (display->palette) {
   603             SDL_FreePalette(display->palette);
   604             display->palette = NULL;
   605         }
   606         if (ncolors) {
   607             display->palette = SDL_AllocPalette(ncolors);
   608             if (!display->palette) {
   609                 return -1;
   610             }
   611             SDL_DitherColors(display->palette->colors,
   612                              SDL_BITSPERPIXEL(display_mode.format));
   613         }
   614     }
   615 
   616     /* Move any fullscreen windows into position */
   617     for (i = 0; i < display->num_windows; ++i) {
   618         SDL_Window *window = &display->windows[i];
   619         if (FULLSCREEN_VISIBLE(window)) {
   620             SDL_SetWindowPosition(window->id, SDL_WINDOWPOS_CENTERED,
   621                                   SDL_WINDOWPOS_CENTERED);
   622         }
   623     }
   624 
   625     return 0;
   626 }
   627 
   628 int
   629 SDL_SetFullscreenDisplayMode(const SDL_DisplayMode * mode)
   630 {
   631     SDL_VideoDisplay *display;
   632     SDL_DisplayMode fullscreen_mode;
   633     int i;
   634 
   635     if (!_this) {
   636         SDL_UninitializedVideo();
   637         return -1;
   638     }
   639 
   640     display = &SDL_CurrentDisplay;
   641     if (!mode) {
   642         mode = &display->desktop_mode;
   643     }
   644 
   645     SDL_GetClosestDisplayMode(mode, &fullscreen_mode);
   646     if (SDL_memcmp
   647         (&fullscreen_mode, &display->fullscreen_mode,
   648          sizeof(fullscreen_mode)) == 0) {
   649         /* Nothing to do... */
   650         return 0;
   651     }
   652     display->fullscreen_mode = fullscreen_mode;
   653 
   654     /* Actually set the mode if we have a fullscreen window visible */
   655     for (i = 0; i < display->num_windows; ++i) {
   656         SDL_Window *window = &display->windows[i];
   657         if (FULLSCREEN_VISIBLE(window)) {
   658             if (SDL_SetDisplayMode(&display->fullscreen_mode) < 0) {
   659                 return -1;
   660             }
   661         }
   662         if (window->flags & SDL_WINDOW_FULLSCREEN) {
   663             SDL_OnWindowResized(window);
   664         }
   665     }
   666     return 0;
   667 }
   668 
   669 int
   670 SDL_GetFullscreenDisplayMode(SDL_DisplayMode * mode)
   671 {
   672     if (!_this) {
   673         SDL_UninitializedVideo();
   674         return -1;
   675     }
   676     if (mode) {
   677         *mode = SDL_CurrentDisplay.fullscreen_mode;
   678     }
   679     return 0;
   680 }
   681 
   682 int
   683 SDL_SetDisplayPalette(const SDL_Color * colors, int firstcolor, int ncolors)
   684 {
   685     SDL_Palette *palette;
   686     int status = 0;
   687 
   688     if (!_this) {
   689         SDL_UninitializedVideo();
   690         return -1;
   691     }
   692     palette = SDL_CurrentDisplay.palette;
   693     if (!palette) {
   694         SDL_SetError("Display mode does not have a palette");
   695         return -1;
   696     }
   697 
   698     status = SDL_SetPaletteColors(palette, colors, firstcolor, ncolors);
   699 
   700     if (_this->SetDisplayPalette) {
   701         if (_this->SetDisplayPalette(_this, palette) < 0) {
   702             status = -1;
   703         }
   704     }
   705     return status;
   706 }
   707 
   708 int
   709 SDL_GetDisplayPalette(SDL_Color * colors, int firstcolor, int ncolors)
   710 {
   711     SDL_Palette *palette;
   712 
   713     if (!_this) {
   714         SDL_UninitializedVideo();
   715         return -1;
   716     }
   717 
   718     palette = SDL_CurrentDisplay.palette;
   719     if (!palette->ncolors) {
   720         SDL_SetError("Display mode does not have a palette");
   721         return -1;
   722     }
   723 
   724     if (firstcolor < 0 || (firstcolor + ncolors) > palette->ncolors) {
   725         SDL_SetError("Palette indices are out of range");
   726         return -1;
   727     }
   728 
   729     SDL_memcpy(colors, &palette->colors[firstcolor],
   730                ncolors * sizeof(*colors));
   731     return 0;
   732 }
   733 
   734 SDL_WindowID
   735 SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
   736 {
   737     const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
   738                                   SDL_WINDOW_OPENGL |
   739                                   SDL_WINDOW_BORDERLESS |
   740                                   SDL_WINDOW_RESIZABLE);
   741     SDL_VideoDisplay *display;
   742     SDL_Window window;
   743     int num_windows;
   744     SDL_Window *windows;
   745 
   746     if (!_this) {
   747         SDL_UninitializedVideo();
   748         return 0;
   749     }
   750 
   751     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   752         SDL_SetError("No OpenGL support in video driver");
   753         return 0;
   754     }
   755 
   756     /* Fullscreen windows don't have any window decorations */
   757     if (flags & SDL_WINDOW_FULLSCREEN) {
   758         flags |= SDL_WINDOW_BORDERLESS;
   759         flags &= ~SDL_WINDOW_RESIZABLE;
   760     }
   761 
   762     SDL_zero(window);
   763     window.id = _this->next_object_id++;
   764     window.x = x;
   765     window.y = y;
   766     window.w = w;
   767     window.h = h;
   768     window.flags = (flags & allowed_flags);
   769     window.display = _this->current_display;
   770 
   771     if (_this->CreateWindow && _this->CreateWindow(_this, &window) < 0) {
   772         return 0;
   773     }
   774 
   775     display = &SDL_CurrentDisplay;
   776     num_windows = display->num_windows;
   777     windows =
   778         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   779     if (!windows) {
   780         if (_this->DestroyWindow) {
   781             _this->DestroyWindow(_this, &window);
   782         }
   783         return 0;
   784     }
   785     windows[num_windows] = window;
   786     display->windows = windows;
   787     display->num_windows++;
   788 
   789     if (title) {
   790         SDL_SetWindowTitle(window.id, title);
   791     }
   792     if (flags & SDL_WINDOW_MAXIMIZED) {
   793         SDL_MaximizeWindow(window.id);
   794     }
   795     if (flags & SDL_WINDOW_MINIMIZED) {
   796         SDL_MinimizeWindow(window.id);
   797     }
   798     if (flags & SDL_WINDOW_SHOWN) {
   799         SDL_ShowWindow(window.id);
   800     }
   801     if (flags & SDL_WINDOW_INPUT_GRABBED) {
   802         SDL_SetWindowGrab(window.id, 1);
   803     }
   804     return window.id;
   805 }
   806 
   807 SDL_WindowID
   808 SDL_CreateWindowFrom(const void *data)
   809 {
   810     SDL_VideoDisplay *display;
   811     SDL_Window window;
   812     int num_windows;
   813     SDL_Window *windows;
   814 
   815     if (!_this) {
   816         SDL_UninitializedVideo();
   817         return (0);
   818     }
   819 
   820     SDL_zero(window);
   821     window.id = _this->next_object_id++;
   822     window.display = _this->current_display;
   823 
   824     if (!_this->CreateWindowFrom ||
   825         _this->CreateWindowFrom(_this, &window, data) < 0) {
   826         return 0;
   827     }
   828 
   829     display = &SDL_CurrentDisplay;
   830     num_windows = display->num_windows;
   831     windows =
   832         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   833     if (!windows) {
   834         if (_this->DestroyWindow) {
   835             _this->DestroyWindow(_this, &window);
   836         }
   837         if (window.title) {
   838             SDL_free(window.title);
   839         }
   840         return 0;
   841     }
   842     windows[num_windows] = window;
   843     display->windows = windows;
   844     display->num_windows++;
   845 
   846     return window.id;
   847 }
   848 
   849 int
   850 SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
   851 {
   852     char *title = window->title;
   853 
   854     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   855         SDL_SetError("No OpenGL support in video driver");
   856         return -1;
   857     }
   858 
   859     if (_this->DestroyWindow) {
   860         _this->DestroyWindow(_this, window);
   861     }
   862 
   863     window->title = NULL;
   864     window->flags =
   865         (flags &
   866          ~(SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED | SDL_WINDOW_SHOWN |
   867            SDL_WINDOW_INPUT_GRABBED));
   868 
   869     if (_this->CreateWindow && _this->CreateWindow(_this, window) < 0) {
   870         return -1;
   871     }
   872 
   873     if (title) {
   874         SDL_SetWindowTitle(window->id, title);
   875         SDL_free(title);
   876     }
   877     if (flags & SDL_WINDOW_MAXIMIZED) {
   878         SDL_MaximizeWindow(window->id);
   879     }
   880     if (flags & SDL_WINDOW_MINIMIZED) {
   881         SDL_MinimizeWindow(window->id);
   882     }
   883     if (flags & SDL_WINDOW_SHOWN) {
   884         SDL_ShowWindow(window->id);
   885     }
   886     if (flags & SDL_WINDOW_INPUT_GRABBED) {
   887         SDL_SetWindowGrab(window->id, 1);
   888     }
   889     return 0;
   890 }
   891 
   892 SDL_Window *
   893 SDL_GetWindowFromID(SDL_WindowID windowID)
   894 {
   895     int i, j;
   896 
   897     if (!_this) {
   898         SDL_UninitializedVideo();
   899         return NULL;
   900     }
   901 
   902     for (i = 0; i < _this->num_displays; ++i) {
   903         SDL_VideoDisplay *display = &_this->displays[i];
   904         for (j = 0; j < display->num_windows; ++j) {
   905             SDL_Window *window = &display->windows[j];
   906             if (window->id == windowID) {
   907                 return window;
   908             }
   909         }
   910     }
   911     return NULL;
   912 }
   913 
   914 SDL_VideoDisplay *
   915 SDL_GetDisplayFromWindow(SDL_Window * window)
   916 {
   917     if (!_this) {
   918         SDL_UninitializedVideo();
   919         return NULL;
   920     }
   921     if (!window) {
   922         return NULL;
   923     }
   924     return &_this->displays[window->display];
   925 }
   926 
   927 Uint32
   928 SDL_GetWindowFlags(SDL_WindowID windowID)
   929 {
   930     SDL_Window *window = SDL_GetWindowFromID(windowID);
   931 
   932     if (!window) {
   933         return 0;
   934     }
   935     return window->flags;
   936 }
   937 
   938 void
   939 SDL_SetWindowTitle(SDL_WindowID windowID, const char *title)
   940 {
   941     SDL_Window *window = SDL_GetWindowFromID(windowID);
   942 
   943     if (!window || title == window->title) {
   944         return;
   945     }
   946 
   947     if (window->title) {
   948         SDL_free(window->title);
   949     }
   950     if (title) {
   951         window->title = SDL_strdup(title);
   952     } else {
   953         window->title = NULL;
   954     }
   955 
   956     if (_this->SetWindowTitle) {
   957         _this->SetWindowTitle(_this, window);
   958     }
   959 }
   960 
   961 const char *
   962 SDL_GetWindowTitle(SDL_WindowID windowID)
   963 {
   964     SDL_Window *window = SDL_GetWindowFromID(windowID);
   965 
   966     if (!window) {
   967         return NULL;
   968     }
   969     return window->title;
   970 }
   971 
   972 void
   973 SDL_SetWindowData(SDL_WindowID windowID, void *userdata)
   974 {
   975     SDL_Window *window = SDL_GetWindowFromID(windowID);
   976 
   977     if (!window) {
   978         return;
   979     }
   980     window->userdata = userdata;
   981 }
   982 
   983 void *
   984 SDL_GetWindowData(SDL_WindowID windowID)
   985 {
   986     SDL_Window *window = SDL_GetWindowFromID(windowID);
   987 
   988     if (!window) {
   989         return NULL;
   990     }
   991     return window->userdata;
   992 }
   993 
   994 void
   995 SDL_SetWindowPosition(SDL_WindowID windowID, int x, int y)
   996 {
   997     SDL_Window *window = SDL_GetWindowFromID(windowID);
   998     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
   999 
  1000     if (!window) {
  1001         return;
  1002     }
  1003 
  1004     if (x == SDL_WINDOWPOS_CENTERED) {
  1005         window->x = (display->current_mode.w - window->w) / 2;
  1006     } else if (x != SDL_WINDOWPOS_UNDEFINED) {
  1007         window->x = x;
  1008     }
  1009     if (y == SDL_WINDOWPOS_CENTERED) {
  1010         window->y = (display->current_mode.h - window->h) / 2;
  1011     } else if (y != SDL_WINDOWPOS_UNDEFINED) {
  1012         window->y = y;
  1013     }
  1014 
  1015     if (_this->SetWindowPosition) {
  1016         _this->SetWindowPosition(_this, window);
  1017     }
  1018 }
  1019 
  1020 void
  1021 SDL_GetWindowPosition(SDL_WindowID windowID, int *x, int *y)
  1022 {
  1023     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1024 
  1025     if (!window) {
  1026         return;
  1027     }
  1028     if (x) {
  1029         *x = window->x;
  1030     }
  1031     if (y) {
  1032         *y = window->y;
  1033     }
  1034 }
  1035 
  1036 void
  1037 SDL_SetWindowSize(SDL_WindowID windowID, int w, int h)
  1038 {
  1039     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1040 
  1041     if (!window) {
  1042         return;
  1043     }
  1044 
  1045     window->w = w;
  1046     window->h = h;
  1047 
  1048     if (_this->SetWindowSize) {
  1049         _this->SetWindowSize(_this, window);
  1050     }
  1051 }
  1052 
  1053 void
  1054 SDL_GetWindowSize(SDL_WindowID windowID, int *w, int *h)
  1055 {
  1056     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1057 
  1058     if (!window) {
  1059         return;
  1060     }
  1061     if (w) {
  1062         *w = window->w;
  1063     }
  1064     if (h) {
  1065         *h = window->h;
  1066     }
  1067 }
  1068 
  1069 void
  1070 SDL_ShowWindow(SDL_WindowID windowID)
  1071 {
  1072     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1073 
  1074     if (!window || (window->flags & SDL_WINDOW_SHOWN)) {
  1075         return;
  1076     }
  1077 
  1078     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_SHOWN, 0, 0);
  1079 
  1080     if (_this->ShowWindow) {
  1081         _this->ShowWindow(_this, window);
  1082     }
  1083 }
  1084 
  1085 void
  1086 SDL_HideWindow(SDL_WindowID windowID)
  1087 {
  1088     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1089 
  1090     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1091         return;
  1092     }
  1093 
  1094     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_HIDDEN, 0, 0);
  1095 
  1096     if (_this->HideWindow) {
  1097         _this->HideWindow(_this, window);
  1098     }
  1099 }
  1100 
  1101 void
  1102 SDL_RaiseWindow(SDL_WindowID windowID)
  1103 {
  1104     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1105 
  1106     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1107         return;
  1108     }
  1109 
  1110     if (_this->RaiseWindow) {
  1111         _this->RaiseWindow(_this, window);
  1112     }
  1113 }
  1114 
  1115 void
  1116 SDL_MaximizeWindow(SDL_WindowID windowID)
  1117 {
  1118     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1119 
  1120     if (!window || (window->flags & SDL_WINDOW_MAXIMIZED)) {
  1121         return;
  1122     }
  1123 
  1124     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MAXIMIZED, 0, 0);
  1125 
  1126     if (_this->MaximizeWindow) {
  1127         _this->MaximizeWindow(_this, window);
  1128     }
  1129 }
  1130 
  1131 void
  1132 SDL_MinimizeWindow(SDL_WindowID windowID)
  1133 {
  1134     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1135 
  1136     if (!window || (window->flags & SDL_WINDOW_MINIMIZED)) {
  1137         return;
  1138     }
  1139 
  1140     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MINIMIZED, 0, 0);
  1141 
  1142     if (_this->MinimizeWindow) {
  1143         _this->MinimizeWindow(_this, window);
  1144     }
  1145 }
  1146 
  1147 void
  1148 SDL_RestoreWindow(SDL_WindowID windowID)
  1149 {
  1150     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1151 
  1152     if (!window
  1153         || (window->flags & (SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED))) {
  1154         return;
  1155     }
  1156 
  1157     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_RESTORED, 0, 0);
  1158 
  1159     if (_this->RestoreWindow) {
  1160         _this->RestoreWindow(_this, window);
  1161     }
  1162 }
  1163 
  1164 int
  1165 SDL_SetWindowFullscreen(SDL_WindowID windowID, int fullscreen)
  1166 {
  1167     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1168 
  1169     if (!window) {
  1170         return -1;
  1171     }
  1172 
  1173     if (fullscreen) {
  1174         fullscreen = SDL_WINDOW_FULLSCREEN;
  1175     }
  1176     if ((window->flags & SDL_WINDOW_FULLSCREEN) == fullscreen) {
  1177         return 0;
  1178     }
  1179 
  1180     if (fullscreen) {
  1181         window->flags |= SDL_WINDOW_FULLSCREEN;
  1182 
  1183         if (FULLSCREEN_VISIBLE(window)) {
  1184             SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1185 
  1186             /* Hide any other fullscreen windows */
  1187             int i;
  1188             for (i = 0; i < display->num_windows; ++i) {
  1189                 SDL_Window *other = &display->windows[i];
  1190                 if (other->id != windowID && FULLSCREEN_VISIBLE(other)) {
  1191                     SDL_MinimizeWindow(other->id);
  1192                 }
  1193             }
  1194 
  1195             SDL_SetDisplayMode(&display->fullscreen_mode);
  1196         }
  1197     } else {
  1198         window->flags &= ~SDL_WINDOW_FULLSCREEN;
  1199 
  1200         if (FULLSCREEN_VISIBLE(window)) {
  1201             SDL_SetDisplayMode(NULL);
  1202         }
  1203     }
  1204     return 0;
  1205 }
  1206 
  1207 void
  1208 SDL_SetWindowGrab(SDL_WindowID windowID, int mode)
  1209 {
  1210     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1211 
  1212     if (!window || (!!mode == !!(window->flags & SDL_WINDOW_INPUT_GRABBED))) {
  1213         return;
  1214     }
  1215 
  1216     if (mode) {
  1217         window->flags |= SDL_WINDOW_INPUT_GRABBED;
  1218     } else {
  1219         window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
  1220     }
  1221 
  1222     if ((window->flags & SDL_WINDOW_INPUT_FOCUS) && _this->SetWindowGrab) {
  1223         _this->SetWindowGrab(_this, window);
  1224     }
  1225 }
  1226 
  1227 int
  1228 SDL_GetWindowGrab(SDL_WindowID windowID)
  1229 {
  1230     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1231 
  1232     if (!window) {
  1233         return 0;
  1234     }
  1235 
  1236     return ((window->flags & SDL_WINDOW_INPUT_GRABBED) != 0);
  1237 }
  1238 
  1239 void
  1240 SDL_OnWindowShown(SDL_Window * window)
  1241 {
  1242 }
  1243 
  1244 void
  1245 SDL_OnWindowHidden(SDL_Window * window)
  1246 {
  1247 }
  1248 
  1249 void
  1250 SDL_OnWindowResized(SDL_Window * window)
  1251 {
  1252     SDL_Renderer *renderer = window->renderer;
  1253 
  1254     if (renderer && renderer->DisplayModeChanged) {
  1255         renderer->DisplayModeChanged(renderer);
  1256     }
  1257 }
  1258 
  1259 void
  1260 SDL_OnWindowFocusGained(SDL_Window * window)
  1261 {
  1262     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1263 
  1264     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1265         SDL_SetDisplayMode(&display->fullscreen_mode);
  1266     }
  1267     if (display->gamma && _this->SetDisplayGammaRamp) {
  1268         _this->SetDisplayGammaRamp(_this, display->gamma);
  1269     }
  1270     if ((window->flags & SDL_WINDOW_INPUT_GRABBED) && _this->SetWindowGrab) {
  1271         _this->SetWindowGrab(_this, window);
  1272     }
  1273 }
  1274 
  1275 void
  1276 SDL_OnWindowFocusLost(SDL_Window * window)
  1277 {
  1278     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1279 
  1280     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1281         SDL_MinimizeWindow(window->id);
  1282         SDL_SetDisplayMode(NULL);
  1283     }
  1284     if (display->gamma && _this->SetDisplayGammaRamp) {
  1285         _this->SetDisplayGammaRamp(_this, display->saved_gamma);
  1286     }
  1287     if ((window->flags & SDL_WINDOW_INPUT_GRABBED) && _this->SetWindowGrab) {
  1288         _this->SetWindowGrab(_this, window);
  1289     }
  1290 }
  1291 
  1292 SDL_WindowID
  1293 SDL_GetFocusWindow(void)
  1294 {
  1295     SDL_VideoDisplay *display;
  1296     int i;
  1297 
  1298     if (!_this) {
  1299         return 0;
  1300     }
  1301 
  1302     display = &SDL_CurrentDisplay;
  1303     for (i = 0; i < display->num_windows; ++i) {
  1304         SDL_Window *window = &display->windows[i];
  1305 
  1306         if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
  1307             return window->id;
  1308         }
  1309     }
  1310     return 0;
  1311 }
  1312 
  1313 void
  1314 SDL_DestroyWindow(SDL_WindowID windowID)
  1315 {
  1316     int i, j;
  1317 
  1318     if (!_this) {
  1319         return;
  1320     }
  1321 
  1322     /* Restore video mode, etc. */
  1323     SDL_SendWindowEvent(windowID, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
  1324 
  1325     for (i = 0; i < _this->num_displays; ++i) {
  1326         SDL_VideoDisplay *display = &_this->displays[i];
  1327         for (j = 0; j < display->num_windows; ++j) {
  1328             SDL_Window *window = &display->windows[j];
  1329             if (window->id != windowID) {
  1330                 continue;
  1331             }
  1332             if (window->title) {
  1333                 SDL_free(window->title);
  1334                 window->title = NULL;
  1335             }
  1336             if (window->renderer) {
  1337                 SDL_DestroyRenderer(window->id);
  1338                 window->renderer = NULL;
  1339             }
  1340             if (_this->DestroyWindow) {
  1341                 _this->DestroyWindow(_this, window);
  1342             }
  1343             if (j != display->num_windows - 1) {
  1344                 SDL_memcpy(&display->windows[i],
  1345                            &display->windows[i + 1],
  1346                            (display->num_windows - i - 1) * sizeof(*window));
  1347             }
  1348             --display->num_windows;
  1349             return;
  1350         }
  1351     }
  1352 }
  1353 
  1354 void
  1355 SDL_AddRenderDriver(int displayIndex, const SDL_RenderDriver * driver)
  1356 {
  1357     SDL_VideoDisplay *display;
  1358     SDL_RenderDriver *render_drivers;
  1359 
  1360     if (displayIndex >= _this->num_displays) {
  1361         return;
  1362     }
  1363     display = &_this->displays[displayIndex];
  1364 
  1365     render_drivers =
  1366         SDL_realloc(display->render_drivers,
  1367                     (display->num_render_drivers +
  1368                      1) * sizeof(*render_drivers));
  1369     if (render_drivers) {
  1370         render_drivers[display->num_render_drivers] = *driver;
  1371         display->render_drivers = render_drivers;
  1372         display->num_render_drivers++;
  1373     }
  1374 }
  1375 
  1376 int
  1377 SDL_GetNumRenderDrivers(void)
  1378 {
  1379     if (_this) {
  1380         return SDL_CurrentDisplay.num_render_drivers;
  1381     }
  1382     return 0;
  1383 }
  1384 
  1385 int
  1386 SDL_GetRenderDriverInfo(int index, SDL_RendererInfo * info)
  1387 {
  1388     if (!_this) {
  1389         SDL_UninitializedVideo();
  1390         return -1;
  1391     }
  1392 
  1393     if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
  1394         SDL_SetError("index must be in the range of 0 - %d",
  1395                      SDL_GetNumRenderDrivers() - 1);
  1396         return -1;
  1397     }
  1398     *info = SDL_CurrentDisplay.render_drivers[index].info;
  1399     return 0;
  1400 }
  1401 
  1402 int
  1403 SDL_CreateRenderer(SDL_WindowID windowID, int index, Uint32 flags)
  1404 {
  1405     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1406 
  1407     if (!window) {
  1408         return 0;
  1409     }
  1410 
  1411     if (index < 0) {
  1412         const char *override = SDL_getenv("SDL_VIDEO_RENDERER");
  1413         int n = SDL_GetNumRenderDrivers();
  1414         for (index = 0; index < n; ++index) {
  1415             SDL_RenderDriver *driver =
  1416                 &SDL_CurrentDisplay.render_drivers[index];
  1417 
  1418             if (override) {
  1419                 if (SDL_strcasecmp(override, driver->info.name) == 0) {
  1420                     break;
  1421                 }
  1422             } else {
  1423                 if ((driver->info.flags & flags) == flags) {
  1424                     break;
  1425                 }
  1426             }
  1427         }
  1428         if (index == n) {
  1429             SDL_SetError("Couldn't find matching render driver");
  1430             return -1;
  1431         }
  1432     }
  1433 
  1434     if (index >= SDL_GetNumRenderDrivers()) {
  1435         SDL_SetError("index must be -1 or in the range of 0 - %d",
  1436                      SDL_GetNumRenderDrivers() - 1);
  1437         return -1;
  1438     }
  1439 
  1440     /* Free any existing renderer */
  1441     SDL_DestroyRenderer(windowID);
  1442 
  1443     /* Create a new renderer instance */
  1444     window->renderer = SDL_CurrentDisplay.render_drivers[index]
  1445         .CreateRenderer(window, flags);
  1446     SDL_SelectRenderer(window->id);
  1447 
  1448     return 0;
  1449 }
  1450 
  1451 int
  1452 SDL_SelectRenderer(SDL_WindowID windowID)
  1453 {
  1454     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1455     SDL_Renderer *renderer;
  1456 
  1457     if (!window || !window->renderer) {
  1458         return -1;
  1459     }
  1460     renderer = window->renderer;
  1461     if (renderer && renderer->ActivateRenderer) {
  1462         if (renderer->ActivateRenderer(renderer) < 0) {
  1463             return -1;
  1464         }
  1465     }
  1466     SDL_CurrentDisplay.current_renderer = renderer;
  1467     return 0;
  1468 }
  1469 
  1470 int
  1471 SDL_GetRendererInfo(SDL_RendererInfo * info)
  1472 {
  1473     if (!_this) {
  1474         SDL_UninitializedVideo();
  1475         return -1;
  1476     }
  1477 
  1478     if (!SDL_CurrentDisplay.current_renderer) {
  1479         SDL_SetError("There is no current renderer");
  1480         return -1;
  1481     }
  1482     *info = SDL_CurrentDisplay.current_renderer->info;
  1483     return 0;
  1484 }
  1485 
  1486 SDL_TextureID
  1487 SDL_CreateTexture(Uint32 format, int access, int w, int h)
  1488 {
  1489     int hash;
  1490     SDL_Renderer *renderer;
  1491     SDL_Texture *texture;
  1492 
  1493     if (!_this) {
  1494         SDL_UninitializedVideo();
  1495         return 0;
  1496     }
  1497 
  1498     renderer = SDL_CurrentDisplay.current_renderer;
  1499     if (!renderer || !renderer->CreateTexture) {
  1500         return 0;
  1501     }
  1502 
  1503     texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
  1504     if (!texture) {
  1505         SDL_OutOfMemory();
  1506         return 0;
  1507     }
  1508 
  1509     texture->id = _this->next_object_id++;
  1510     texture->format = format;
  1511     texture->access = access;
  1512     texture->w = w;
  1513     texture->h = h;
  1514     texture->r = 255;
  1515     texture->g = 255;
  1516     texture->b = 255;
  1517     texture->a = 255;
  1518     texture->renderer = renderer;
  1519 
  1520     if (renderer->CreateTexture(renderer, texture) < 0) {
  1521         if (renderer->DestroyTexture) {
  1522             renderer->DestroyTexture(renderer, texture);
  1523         }
  1524         SDL_free(texture);
  1525         return 0;
  1526     }
  1527 
  1528     hash = (texture->id % SDL_arraysize(SDL_CurrentDisplay.textures));
  1529     texture->next = SDL_CurrentDisplay.textures[hash];
  1530     SDL_CurrentDisplay.textures[hash] = texture;
  1531 
  1532     return texture->id;
  1533 }
  1534 
  1535 SDL_TextureID
  1536 SDL_CreateTextureFromSurface(Uint32 format, SDL_Surface * surface)
  1537 {
  1538     SDL_TextureID textureID;
  1539     SDL_PixelFormat *fmt;
  1540     int bpp;
  1541     Uint32 Rmask, Gmask, Bmask, Amask;
  1542 
  1543     if (!surface) {
  1544         SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
  1545         return 0;
  1546     }
  1547     fmt = surface->format;
  1548 
  1549     if (format) {
  1550         if (!SDL_PixelFormatEnumToMasks
  1551             (format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
  1552             SDL_SetError("Unknown pixel format");
  1553             return 0;
  1554         }
  1555     } else {
  1556         if (surface->format->Amask
  1557             || !(surface->map->info.flags &
  1558                  (SDL_COPY_COLORKEY | SDL_COPY_MASK | SDL_COPY_BLEND))) {
  1559             bpp = fmt->BitsPerPixel;
  1560             Rmask = fmt->Rmask;
  1561             Gmask = fmt->Gmask;
  1562             Bmask = fmt->Bmask;
  1563             Amask = fmt->Amask;
  1564         } else {
  1565             /* Need a format with alpha */
  1566             bpp = 32;
  1567             Rmask = 0x00FF0000;
  1568             Gmask = 0x0000FF00;
  1569             Bmask = 0x000000FF;
  1570             Amask = 0xFF000000;
  1571         }
  1572         format = SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
  1573         if (!format) {
  1574             SDL_SetError("Unknown pixel format");
  1575             return 0;
  1576         }
  1577     }
  1578 
  1579     textureID =
  1580         SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1581                           surface->h);
  1582     if (!textureID) {
  1583         return 0;
  1584     }
  1585 
  1586     if (bpp == fmt->BitsPerPixel && Rmask == fmt->Rmask && Gmask == fmt->Gmask
  1587         && Bmask == fmt->Bmask && Amask == fmt->Amask) {
  1588         if (SDL_MUSTLOCK(surface)) {
  1589             if (SDL_LockSurface(surface) < 0) {
  1590                 SDL_DestroyTexture(textureID);
  1591                 return 0;
  1592             }
  1593             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1594                               surface->pitch);
  1595             SDL_UnlockSurface(surface);
  1596         } else {
  1597             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1598                               surface->pitch);
  1599         }
  1600     } else {
  1601         SDL_PixelFormat *dst_fmt;
  1602         SDL_Surface *dst = NULL;
  1603 
  1604         /* Set up a destination surface for the texture update */
  1605         dst_fmt = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
  1606         if (dst_fmt) {
  1607             if (SDL_ISPIXELFORMAT_INDEXED(format)) {
  1608                 dst_fmt->palette =
  1609                     SDL_AllocPalette((1 << SDL_BITSPERPIXEL(format)));
  1610                 if (dst_fmt->palette) {
  1611                     /* FIXME: Should we try to copy fmt->palette? */
  1612                     SDL_DitherColors(dst_fmt->palette->colors,
  1613                                      SDL_BITSPERPIXEL(format));
  1614                 }
  1615             }
  1616 
  1617             dst = SDL_ConvertSurface(surface, dst_fmt, 0);
  1618             if (dst) {
  1619                 SDL_UpdateTexture(textureID, NULL, dst->pixels, dst->pitch);
  1620                 SDL_FreeSurface(dst);
  1621             }
  1622             if (dst_fmt->palette) {
  1623                 SDL_FreePalette(dst_fmt->palette);
  1624             }
  1625             SDL_FreeFormat(dst_fmt);
  1626         }
  1627         if (!dst) {
  1628             SDL_DestroyTexture(textureID);
  1629             return 0;
  1630         }
  1631     }
  1632 
  1633     if (SDL_ISPIXELFORMAT_INDEXED(format) && fmt->palette) {
  1634         SDL_SetTexturePalette(textureID, fmt->palette->colors, 0,
  1635                               fmt->palette->ncolors);
  1636     }
  1637 
  1638     return textureID;
  1639 }
  1640 
  1641 static __inline__ SDL_Texture *
  1642 SDL_GetTextureFromID(SDL_TextureID textureID)
  1643 {
  1644     int hash;
  1645     SDL_Texture *texture;
  1646 
  1647     if (!_this) {
  1648         return NULL;
  1649     }
  1650 
  1651     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  1652     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  1653          texture = texture->next) {
  1654         if (texture->id == textureID) {
  1655             return texture;
  1656         }
  1657     }
  1658     return NULL;
  1659 }
  1660 
  1661 int
  1662 SDL_QueryTexture(SDL_TextureID textureID, Uint32 * format, int *access,
  1663                  int *w, int *h)
  1664 {
  1665     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1666 
  1667     if (!texture) {
  1668         return -1;
  1669     }
  1670 
  1671     if (format) {
  1672         *format = texture->format;
  1673     }
  1674     if (access) {
  1675         *access = texture->access;
  1676     }
  1677     if (w) {
  1678         *w = texture->w;
  1679     }
  1680     if (h) {
  1681         *h = texture->h;
  1682     }
  1683     return 0;
  1684 }
  1685 
  1686 int
  1687 SDL_QueryTexturePixels(SDL_TextureID textureID, void **pixels, int *pitch)
  1688 {
  1689     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1690     SDL_Renderer *renderer;
  1691 
  1692     if (!texture) {
  1693         return -1;
  1694     }
  1695 
  1696     renderer = texture->renderer;
  1697     if (!renderer->QueryTexturePixels) {
  1698         return -1;
  1699     }
  1700     return renderer->QueryTexturePixels(renderer, texture, pixels, pitch);
  1701 }
  1702 
  1703 int
  1704 SDL_SetTexturePalette(SDL_TextureID textureID, const SDL_Color * colors,
  1705                       int firstcolor, int ncolors)
  1706 {
  1707     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1708     SDL_Renderer *renderer;
  1709 
  1710     if (!texture) {
  1711         return -1;
  1712     }
  1713 
  1714     renderer = texture->renderer;
  1715     if (!renderer->SetTexturePalette) {
  1716         return -1;
  1717     }
  1718     return renderer->SetTexturePalette(renderer, texture, colors, firstcolor,
  1719                                        ncolors);
  1720 }
  1721 
  1722 int
  1723 SDL_GetTexturePalette(SDL_TextureID textureID, SDL_Color * colors,
  1724                       int firstcolor, int ncolors)
  1725 {
  1726     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1727     SDL_Renderer *renderer;
  1728 
  1729     if (!texture) {
  1730         return -1;
  1731     }
  1732 
  1733     renderer = texture->renderer;
  1734     if (!renderer->GetTexturePalette) {
  1735         return -1;
  1736     }
  1737     return renderer->GetTexturePalette(renderer, texture, colors, firstcolor,
  1738                                        ncolors);
  1739 }
  1740 
  1741 int
  1742 SDL_SetTextureColorMod(SDL_TextureID textureID, Uint8 r, Uint8 g, Uint8 b)
  1743 {
  1744     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1745     SDL_Renderer *renderer;
  1746 
  1747     if (!texture) {
  1748         return -1;
  1749     }
  1750 
  1751     renderer = texture->renderer;
  1752     if (!renderer->SetTextureColorMod) {
  1753         return -1;
  1754     }
  1755     if (r < 255 || g < 255 || b < 255) {
  1756         texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
  1757     } else {
  1758         texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
  1759     }
  1760     texture->r = r;
  1761     texture->g = g;
  1762     texture->b = b;
  1763     return renderer->SetTextureColorMod(renderer, texture);
  1764 }
  1765 
  1766 int
  1767 SDL_GetTextureColorMod(SDL_TextureID textureID, Uint8 * r, Uint8 * g,
  1768                        Uint8 * b)
  1769 {
  1770     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1771     SDL_Renderer *renderer;
  1772 
  1773     if (!texture) {
  1774         return -1;
  1775     }
  1776 
  1777     renderer = texture->renderer;
  1778     if (r) {
  1779         *r = texture->r;
  1780     }
  1781     if (g) {
  1782         *g = texture->g;
  1783     }
  1784     if (b) {
  1785         *b = texture->b;
  1786     }
  1787     return 0;
  1788 }
  1789 
  1790 int
  1791 SDL_SetTextureAlphaMod(SDL_TextureID textureID, Uint8 alpha)
  1792 {
  1793     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1794     SDL_Renderer *renderer;
  1795 
  1796     if (!texture) {
  1797         return -1;
  1798     }
  1799 
  1800     renderer = texture->renderer;
  1801     if (!renderer->SetTextureAlphaMod) {
  1802         return -1;
  1803     }
  1804     if (alpha < 255) {
  1805         texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
  1806     } else {
  1807         texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
  1808     }
  1809     texture->a = alpha;
  1810     return renderer->SetTextureAlphaMod(renderer, texture);
  1811 }
  1812 
  1813 int
  1814 SDL_GetTextureAlphaMod(SDL_TextureID textureID, Uint8 * alpha)
  1815 {
  1816     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1817 
  1818     if (!texture) {
  1819         return -1;
  1820     }
  1821 
  1822     if (alpha) {
  1823         *alpha = texture->a;
  1824     }
  1825     return 0;
  1826 }
  1827 
  1828 int
  1829 SDL_SetTextureBlendMode(SDL_TextureID textureID, int blendMode)
  1830 {
  1831     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1832     SDL_Renderer *renderer;
  1833 
  1834     if (!texture) {
  1835         return -1;
  1836     }
  1837 
  1838     renderer = texture->renderer;
  1839     if (!renderer->SetTextureBlendMode) {
  1840         return -1;
  1841     }
  1842     texture->blendMode = blendMode;
  1843     return renderer->SetTextureBlendMode(renderer, texture);
  1844 }
  1845 
  1846 int
  1847 SDL_GetTextureBlendMode(SDL_TextureID textureID, int *blendMode)
  1848 {
  1849     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1850 
  1851     if (!texture) {
  1852         return -1;
  1853     }
  1854 
  1855     if (blendMode) {
  1856         *blendMode = texture->blendMode;
  1857     }
  1858     return 0;
  1859 }
  1860 
  1861 int
  1862 SDL_SetTextureScaleMode(SDL_TextureID textureID, int scaleMode)
  1863 {
  1864     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1865     SDL_Renderer *renderer;
  1866 
  1867     if (!texture) {
  1868         return -1;
  1869     }
  1870 
  1871     renderer = texture->renderer;
  1872     if (!renderer->SetTextureScaleMode) {
  1873         return -1;
  1874     }
  1875     texture->scaleMode = scaleMode;
  1876     return renderer->SetTextureScaleMode(renderer, texture);
  1877 }
  1878 
  1879 int
  1880 SDL_GetTextureScaleMode(SDL_TextureID textureID, int *scaleMode)
  1881 {
  1882     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1883 
  1884     if (!texture) {
  1885         return -1;
  1886     }
  1887 
  1888     if (scaleMode) {
  1889         *scaleMode = texture->scaleMode;
  1890     }
  1891     return 0;
  1892 }
  1893 
  1894 int
  1895 SDL_UpdateTexture(SDL_TextureID textureID, const SDL_Rect * rect,
  1896                   const void *pixels, int pitch)
  1897 {
  1898     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1899     SDL_Renderer *renderer;
  1900     SDL_Rect full_rect;
  1901 
  1902     if (!texture) {
  1903         return -1;
  1904     }
  1905 
  1906     renderer = texture->renderer;
  1907     if (!renderer->UpdateTexture) {
  1908         return -1;
  1909     }
  1910 
  1911     if (!rect) {
  1912         full_rect.x = 0;
  1913         full_rect.y = 0;
  1914         full_rect.w = texture->w;
  1915         full_rect.h = texture->h;
  1916         rect = &full_rect;
  1917     }
  1918 
  1919     return renderer->UpdateTexture(renderer, texture, rect, pixels, pitch);
  1920 }
  1921 
  1922 int
  1923 SDL_LockTexture(SDL_TextureID textureID, const SDL_Rect * rect, int markDirty,
  1924                 void **pixels, int *pitch)
  1925 {
  1926     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1927     SDL_Renderer *renderer;
  1928     SDL_Rect full_rect;
  1929 
  1930     if (!texture) {
  1931         return -1;
  1932     }
  1933     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1934         SDL_SetError("SDL_LockTexture(): texture must be streaming");
  1935         return -1;
  1936     }
  1937 
  1938     renderer = texture->renderer;
  1939     if (!renderer->LockTexture) {
  1940         return -1;
  1941     }
  1942 
  1943     if (!rect) {
  1944         full_rect.x = 0;
  1945         full_rect.y = 0;
  1946         full_rect.w = texture->w;
  1947         full_rect.h = texture->h;
  1948         rect = &full_rect;
  1949     }
  1950 
  1951     return renderer->LockTexture(renderer, texture, rect, markDirty, pixels,
  1952                                  pitch);
  1953 }
  1954 
  1955 void
  1956 SDL_UnlockTexture(SDL_TextureID textureID)
  1957 {
  1958     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1959     SDL_Renderer *renderer;
  1960 
  1961     if (!texture) {
  1962         return;
  1963     }
  1964     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1965         return;
  1966     }
  1967 
  1968     renderer = texture->renderer;
  1969     if (!renderer->UnlockTexture) {
  1970         return;
  1971     }
  1972     renderer->UnlockTexture(renderer, texture);
  1973 }
  1974 
  1975 void
  1976 SDL_DirtyTexture(SDL_TextureID textureID, int numrects,
  1977                  const SDL_Rect * rects)
  1978 {
  1979     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1980     SDL_Renderer *renderer;
  1981 
  1982     if (!texture) {
  1983         return;
  1984     }
  1985     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  1986         return;
  1987     }
  1988 
  1989     renderer = texture->renderer;
  1990     if (!renderer->DirtyTexture) {
  1991         return;
  1992     }
  1993     renderer->DirtyTexture(renderer, texture, numrects, rects);
  1994 }
  1995 
  1996 int
  1997 SDL_RenderFill(Uint8 r, Uint8 g, Uint8 b, Uint8 a, const SDL_Rect * rect)
  1998 {
  1999     SDL_Renderer *renderer;
  2000     SDL_Window *window;
  2001     SDL_Rect real_rect;
  2002 
  2003     if (!_this) {
  2004         SDL_UninitializedVideo();
  2005         return -1;
  2006     }
  2007 
  2008     renderer = SDL_CurrentDisplay.current_renderer;
  2009     if (!renderer || !renderer->RenderFill) {
  2010         return -1;
  2011     }
  2012 
  2013     window = SDL_GetWindowFromID(renderer->window);
  2014     real_rect.x = 0;
  2015     real_rect.y = 0;
  2016     real_rect.w = window->w;
  2017     real_rect.h = window->h;
  2018     if (rect) {
  2019         if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
  2020             return 0;
  2021         }
  2022     }
  2023 
  2024     return renderer->RenderFill(renderer, r, g, b, a, &real_rect);
  2025 }
  2026 
  2027 int
  2028 SDL_RenderCopy(SDL_TextureID textureID, const SDL_Rect * srcrect,
  2029                const SDL_Rect * dstrect)
  2030 {
  2031     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2032     SDL_Renderer *renderer;
  2033     SDL_Window *window;
  2034     SDL_Rect real_srcrect;
  2035     SDL_Rect real_dstrect;
  2036 
  2037     if (!texture || texture->renderer != SDL_CurrentDisplay.current_renderer) {
  2038         return -1;
  2039     }
  2040 
  2041     renderer = SDL_CurrentDisplay.current_renderer;
  2042     if (!renderer || !renderer->RenderCopy) {
  2043         return -1;
  2044     }
  2045 
  2046     window = SDL_GetWindowFromID(renderer->window);
  2047     if (srcrect) {
  2048         real_srcrect = *srcrect;
  2049     } else {
  2050         real_srcrect.x = 0;
  2051         real_srcrect.y = 0;
  2052         real_srcrect.w = texture->w;
  2053         real_srcrect.h = texture->h;
  2054     }
  2055     if (dstrect) {
  2056         real_dstrect = *dstrect;
  2057     } else {
  2058         real_dstrect.x = 0;
  2059         real_dstrect.y = 0;
  2060         real_dstrect.w = window->w;
  2061         real_dstrect.h = window->h;
  2062     }
  2063 
  2064     return renderer->RenderCopy(renderer, texture, &real_srcrect,
  2065                                 &real_dstrect);
  2066 }
  2067 
  2068 void
  2069 SDL_RenderPresent(void)
  2070 {
  2071     SDL_Renderer *renderer;
  2072 
  2073     if (!_this) {
  2074         SDL_UninitializedVideo();
  2075         return;
  2076     }
  2077 
  2078     renderer = SDL_CurrentDisplay.current_renderer;
  2079     if (!renderer || !renderer->RenderPresent) {
  2080         return;
  2081     }
  2082     renderer->RenderPresent(renderer);
  2083 }
  2084 
  2085 void
  2086 SDL_DestroyTexture(SDL_TextureID textureID)
  2087 {
  2088     int hash;
  2089     SDL_Texture *prev, *texture;
  2090     SDL_Renderer *renderer;
  2091 
  2092     if (!_this) {
  2093         SDL_UninitializedVideo();
  2094         return;
  2095     }
  2096 
  2097     /* Look up the texture in the hash table */
  2098     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  2099     prev = NULL;
  2100     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  2101          prev = texture, texture = texture->next) {
  2102         if (texture->id == textureID) {
  2103             break;
  2104         }
  2105     }
  2106     if (!texture) {
  2107         return;
  2108     }
  2109 
  2110     /* Unlink the texture from the list */
  2111     if (prev) {
  2112         prev->next = texture->next;
  2113     } else {
  2114         SDL_CurrentDisplay.textures[hash] = texture->next;
  2115     }
  2116 
  2117     /* Free the texture */
  2118     renderer = texture->renderer;
  2119     renderer->DestroyTexture(renderer, texture);
  2120     SDL_free(texture);
  2121 }
  2122 
  2123 void
  2124 SDL_DestroyRenderer(SDL_WindowID windowID)
  2125 {
  2126     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2127     SDL_Renderer *renderer;
  2128     int i;
  2129 
  2130     if (!window) {
  2131         return;
  2132     }
  2133 
  2134     renderer = window->renderer;
  2135     if (!renderer) {
  2136         return;
  2137     }
  2138 
  2139     /* Free existing textures for this renderer */
  2140     for (i = 0; i < SDL_arraysize(SDL_CurrentDisplay.textures); ++i) {
  2141         SDL_Texture *texture;
  2142         SDL_Texture *prev = NULL;
  2143         SDL_Texture *next;
  2144         for (texture = SDL_CurrentDisplay.textures[i]; texture;
  2145              texture = next) {
  2146             next = texture->next;
  2147             if (texture->renderer == renderer) {
  2148                 if (prev) {
  2149                     prev->next = next;
  2150                 } else {
  2151                     SDL_CurrentDisplay.textures[i] = next;
  2152                 }
  2153                 renderer->DestroyTexture(renderer, texture);
  2154                 SDL_free(texture);
  2155             } else {
  2156                 prev = texture;
  2157             }
  2158         }
  2159     }
  2160 
  2161     /* Free the renderer instance */
  2162     renderer->DestroyRenderer(renderer);
  2163 
  2164     /* Clear references */
  2165     window->renderer = NULL;
  2166     if (SDL_CurrentDisplay.current_renderer == renderer) {
  2167         SDL_CurrentDisplay.current_renderer = NULL;
  2168     }
  2169 }
  2170 
  2171 void
  2172 SDL_VideoQuit(void)
  2173 {
  2174     int i, j;
  2175 
  2176     if (!_this) {
  2177         return;
  2178     }
  2179 
  2180     /* Halt event processing before doing anything else */
  2181     SDL_StopEventLoop();
  2182 
  2183     /* Clean up the system video */
  2184     for (i = _this->num_displays; i--;) {
  2185         SDL_VideoDisplay *display = &_this->displays[i];
  2186         for (j = display->num_windows; j--;) {
  2187             SDL_DestroyWindow(display->windows[i].id);
  2188         }
  2189         if (display->windows) {
  2190             SDL_free(display->windows);
  2191             display->windows = NULL;
  2192         }
  2193         display->num_windows = 0;
  2194         if (display->render_drivers) {
  2195             SDL_free(display->render_drivers);
  2196             display->render_drivers = NULL;
  2197         }
  2198         display->num_render_drivers = 0;
  2199     }
  2200     _this->VideoQuit(_this);
  2201 
  2202     for (i = _this->num_displays; i--;) {
  2203         SDL_VideoDisplay *display = &_this->displays[i];
  2204         for (j = display->num_display_modes; j--;) {
  2205             if (display->display_modes[j].driverdata) {
  2206                 SDL_free(display->display_modes[j].driverdata);
  2207                 display->display_modes[j].driverdata = NULL;
  2208             }
  2209         }
  2210         if (display->display_modes) {
  2211             SDL_free(display->display_modes);
  2212             display->display_modes = NULL;
  2213         }
  2214         if (display->desktop_mode.driverdata) {
  2215             SDL_free(display->desktop_mode.driverdata);
  2216             display->desktop_mode.driverdata = NULL;
  2217         }
  2218         if (display->palette) {
  2219             SDL_FreePalette(display->palette);
  2220             display->palette = NULL;
  2221         }
  2222         if (display->gamma) {
  2223             SDL_free(display->gamma);
  2224             display->gamma = NULL;
  2225         }
  2226         if (display->driverdata) {
  2227             SDL_free(display->driverdata);
  2228             display->driverdata = NULL;
  2229         }
  2230     }
  2231     if (_this->displays) {
  2232         SDL_free(_this->displays);
  2233         _this->displays = NULL;
  2234     }
  2235     _this->free(_this);
  2236     _this = NULL;
  2237 }
  2238 
  2239 int
  2240 SDL_GL_LoadLibrary(const char *path)
  2241 {
  2242     int retval;
  2243 
  2244     if (!_this) {
  2245         SDL_UninitializedVideo();
  2246         return -1;
  2247     }
  2248 
  2249     if (_this->GL_LoadLibrary) {
  2250         retval = _this->GL_LoadLibrary(_this, path);
  2251     } else {
  2252         SDL_SetError("No dynamic GL support in video driver");
  2253         retval = -1;
  2254     }
  2255     return (retval);
  2256 }
  2257 
  2258 void *
  2259 SDL_GL_GetProcAddress(const char *proc)
  2260 {
  2261     void *func;
  2262 
  2263     if (!_this) {
  2264         SDL_UninitializedVideo();
  2265         return NULL;
  2266     }
  2267 
  2268     func = NULL;
  2269     if (_this->GL_GetProcAddress) {
  2270         if (_this->gl_config.driver_loaded) {
  2271             func = _this->GL_GetProcAddress(_this, proc);
  2272         } else {
  2273             SDL_SetError("No GL driver has been loaded");
  2274         }
  2275     } else {
  2276         SDL_SetError("No dynamic GL support in video driver");
  2277     }
  2278     return func;
  2279 }
  2280 
  2281 SDL_bool
  2282 SDL_GL_ExtensionSupported(const char *extension)
  2283 {
  2284 #if SDL_VIDEO_OPENGL
  2285     const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
  2286     const char *extensions;
  2287     const char *start;
  2288     const char *where, *terminator;
  2289 
  2290     /* Extension names should not have spaces. */
  2291     where = SDL_strchr(extension, ' ');
  2292     if (where || *extension == '\0') {
  2293         return SDL_FALSE;
  2294     }
  2295 
  2296     /* See if there's an environment variable override */
  2297     start = SDL_getenv(extension);
  2298     if (start && *start == '0') {
  2299         return SDL_FALSE;
  2300     }
  2301 
  2302     /* Lookup the available extensions */
  2303     glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
  2304     if (glGetStringFunc) {
  2305         extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
  2306     } else {
  2307         extensions = NULL;
  2308     }
  2309     if (!extensions) {
  2310         return SDL_FALSE;
  2311     }
  2312 
  2313     /* It takes a bit of care to be fool-proof about parsing the
  2314      * OpenGL extensions string. Don't be fooled by sub-strings,
  2315      * etc. */
  2316 
  2317     start = extensions;
  2318 
  2319     for (;;) {
  2320         where = SDL_strstr(start, extension);
  2321         if (!where)
  2322             break;
  2323 
  2324         terminator = where + SDL_strlen(extension);
  2325         if (where == start || *(where - 1) == ' ')
  2326             if (*terminator == ' ' || *terminator == '\0')
  2327                 return SDL_TRUE;
  2328 
  2329         start = terminator;
  2330     }
  2331     return SDL_FALSE;
  2332 #else
  2333     return SDL_FALSE;
  2334 #endif
  2335 }
  2336 
  2337 int
  2338 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
  2339 {
  2340 #if SDL_VIDEO_OPENGL
  2341     int retval;
  2342 
  2343     if (!_this) {
  2344         SDL_UninitializedVideo();
  2345         return -1;
  2346     }
  2347 
  2348     retval = 0;
  2349     switch (attr) {
  2350     case SDL_GL_RED_SIZE:
  2351         _this->gl_config.red_size = value;
  2352         break;
  2353     case SDL_GL_GREEN_SIZE:
  2354         _this->gl_config.green_size = value;
  2355         break;
  2356     case SDL_GL_BLUE_SIZE:
  2357         _this->gl_config.blue_size = value;
  2358         break;
  2359     case SDL_GL_ALPHA_SIZE:
  2360         _this->gl_config.alpha_size = value;
  2361         break;
  2362     case SDL_GL_DOUBLEBUFFER:
  2363         _this->gl_config.double_buffer = value;
  2364         break;
  2365     case SDL_GL_BUFFER_SIZE:
  2366         _this->gl_config.buffer_size = value;
  2367         break;
  2368     case SDL_GL_DEPTH_SIZE:
  2369         _this->gl_config.depth_size = value;
  2370         break;
  2371     case SDL_GL_STENCIL_SIZE:
  2372         _this->gl_config.stencil_size = value;
  2373         break;
  2374     case SDL_GL_ACCUM_RED_SIZE:
  2375         _this->gl_config.accum_red_size = value;
  2376         break;
  2377     case SDL_GL_ACCUM_GREEN_SIZE:
  2378         _this->gl_config.accum_green_size = value;
  2379         break;
  2380     case SDL_GL_ACCUM_BLUE_SIZE:
  2381         _this->gl_config.accum_blue_size = value;
  2382         break;
  2383     case SDL_GL_ACCUM_ALPHA_SIZE:
  2384         _this->gl_config.accum_alpha_size = value;
  2385         break;
  2386     case SDL_GL_STEREO:
  2387         _this->gl_config.stereo = value;
  2388         break;
  2389     case SDL_GL_MULTISAMPLEBUFFERS:
  2390         _this->gl_config.multisamplebuffers = value;
  2391         break;
  2392     case SDL_GL_MULTISAMPLESAMPLES:
  2393         _this->gl_config.multisamplesamples = value;
  2394         break;
  2395     case SDL_GL_ACCELERATED_VISUAL:
  2396         _this->gl_config.accelerated = value;
  2397         break;
  2398     default:
  2399         SDL_SetError("Unknown OpenGL attribute");
  2400         retval = -1;
  2401         break;
  2402     }
  2403     return retval;
  2404 #else
  2405     SDL_Unsupported();
  2406     return -1;
  2407 #endif /* SDL_VIDEO_OPENGL */
  2408 }
  2409 
  2410 int
  2411 SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
  2412 {
  2413 #if SDL_VIDEO_OPENGL
  2414     void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2415     GLenum attrib = 0;
  2416 
  2417     glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2418     if (!glGetIntegervFunc) {
  2419         return -1;
  2420     }
  2421     switch (attr) {
  2422     case SDL_GL_RED_SIZE:
  2423         attrib = GL_RED_BITS;
  2424         break;
  2425     case SDL_GL_BLUE_SIZE:
  2426         attrib = GL_BLUE_BITS;
  2427         break;
  2428     case SDL_GL_GREEN_SIZE:
  2429         attrib = GL_GREEN_BITS;
  2430         break;
  2431     case SDL_GL_ALPHA_SIZE:
  2432         attrib = GL_ALPHA_BITS;
  2433         break;
  2434     case SDL_GL_DOUBLEBUFFER:
  2435         attrib = GL_DOUBLEBUFFER;
  2436         break;
  2437     case SDL_GL_DEPTH_SIZE:
  2438         attrib = GL_DEPTH_BITS;
  2439         break;
  2440     case SDL_GL_STENCIL_SIZE:
  2441         attrib = GL_STENCIL_BITS;
  2442         break;
  2443     case SDL_GL_ACCUM_RED_SIZE:
  2444         attrib = GL_ACCUM_RED_BITS;
  2445         break;
  2446     case SDL_GL_ACCUM_GREEN_SIZE:
  2447         attrib = GL_ACCUM_GREEN_BITS;
  2448         break;
  2449     case SDL_GL_ACCUM_BLUE_SIZE:
  2450         attrib = GL_ACCUM_BLUE_BITS;
  2451         break;
  2452     case SDL_GL_ACCUM_ALPHA_SIZE:
  2453         attrib = GL_ACCUM_ALPHA_BITS;
  2454         break;
  2455     case SDL_GL_STEREO:
  2456         attrib = GL_STEREO;
  2457         break;
  2458     case SDL_GL_MULTISAMPLEBUFFERS:
  2459         attrib = GL_SAMPLE_BUFFERS_ARB;
  2460         break;
  2461     case SDL_GL_MULTISAMPLESAMPLES:
  2462         attrib = GL_SAMPLES_ARB;
  2463         break;
  2464     case SDL_GL_BUFFER_SIZE:
  2465         {
  2466             GLint bits = 0;
  2467             GLint component;
  2468 
  2469             /* there doesn't seem to be a single flag in OpenGL for this! */
  2470             glGetIntegervFunc(GL_RED_BITS, &component);
  2471             bits += component;
  2472             glGetIntegervFunc(GL_GREEN_BITS, &component);
  2473             bits += component;
  2474             glGetIntegervFunc(GL_BLUE_BITS, &component);
  2475             bits += component;
  2476             glGetIntegervFunc(GL_ALPHA_BITS, &component);
  2477             bits += component;
  2478 
  2479             *value = bits;
  2480             return 0;
  2481         }
  2482     case SDL_GL_ACCELERATED_VISUAL:
  2483         {
  2484             /* FIXME: How do we get this information? */
  2485             *value = (_this->gl_config.accelerated != 0);
  2486             return 0;
  2487         }
  2488     default:
  2489         SDL_SetError("Unknown OpenGL attribute");
  2490         return -1;
  2491     }
  2492 
  2493     glGetIntegervFunc(attrib, (GLint *) value);
  2494     return 0;
  2495 #else
  2496     SDL_Unsupported();
  2497     return -1;
  2498 #endif /* SDL_VIDEO_OPENGL */
  2499 }
  2500 
  2501 SDL_GLContext
  2502 SDL_GL_CreateContext(SDL_WindowID windowID)
  2503 {
  2504     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2505 
  2506     if (!window) {
  2507         return NULL;
  2508     }
  2509     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2510         SDL_SetError("The specified window isn't an OpenGL window");
  2511         return NULL;
  2512     }
  2513     return _this->GL_CreateContext(_this, window);
  2514 }
  2515 
  2516 int
  2517 SDL_GL_MakeCurrent(SDL_WindowID windowID, SDL_GLContext context)
  2518 {
  2519     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2520 
  2521     if (window && !(window->flags & SDL_WINDOW_OPENGL)) {
  2522         SDL_SetError("The specified window isn't an OpenGL window");
  2523         return -1;
  2524     }
  2525     if (!context) {
  2526         window = NULL;
  2527     }
  2528     if (window) {
  2529         if (window->context == context) {
  2530             return 0;
  2531         }
  2532         window->context = context;
  2533     }
  2534     return _this->GL_MakeCurrent(_this, window, context);
  2535 }
  2536 
  2537 int
  2538 SDL_GL_SetSwapInterval(int interval)
  2539 {
  2540     if (!_this) {
  2541         SDL_UninitializedVideo();
  2542         return -1;
  2543     }
  2544 
  2545     if (_this->GL_SetSwapInterval) {
  2546         return _this->GL_SetSwapInterval(_this, interval);
  2547     } else {
  2548         SDL_SetError("Setting the swap interval is not supported");
  2549         return -1;
  2550     }
  2551 }
  2552 
  2553 int
  2554 SDL_GL_GetSwapInterval(void)
  2555 {
  2556     if (!_this) {
  2557         SDL_UninitializedVideo();
  2558         return -1;
  2559     }
  2560 
  2561     if (_this->GL_GetSwapInterval) {
  2562         return _this->GL_GetSwapInterval(_this);
  2563     } else {
  2564         SDL_SetError("Getting the swap interval is not supported");
  2565         return -1;
  2566     }
  2567 }
  2568 
  2569 void
  2570 SDL_GL_SwapWindow(SDL_WindowID windowID)
  2571 {
  2572     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2573 
  2574     if (!window) {
  2575         return;
  2576     }
  2577     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2578         SDL_SetError("The specified window isn't an OpenGL window");
  2579         return;
  2580     }
  2581     _this->GL_SwapWindow(_this, window);
  2582 }
  2583 
  2584 void
  2585 SDL_GL_DeleteContext(SDL_GLContext context)
  2586 {
  2587     if (!_this || !context) {
  2588         return;
  2589     }
  2590     _this->GL_MakeCurrent(_this, NULL, NULL);
  2591     _this->GL_DeleteContext(_this, context);
  2592 }
  2593 
  2594 #if 0                           // FIXME
  2595 /* Utility function used by SDL_WM_SetIcon();
  2596  * flags & 1 for color key, flags & 2 for alpha channel. */
  2597 static void
  2598 CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
  2599 {
  2600     int x, y;
  2601     Uint32 colorkey;
  2602 #define SET_MASKBIT(icon, x, y, mask) \
  2603 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  2604 
  2605     colorkey = icon->format->colorkey;
  2606     switch (icon->format->BytesPerPixel) {
  2607     case 1:
  2608         {
  2609             Uint8 *pixels;
  2610             for (y = 0; y < icon->h; ++y) {
  2611                 pixels = (Uint8 *) icon->pixels + y * icon->pitch;
  2612                 for (x = 0; x < icon->w; ++x) {
  2613                     if (*pixels++ == colorkey) {
  2614                         SET_MASKBIT(icon, x, y, mask);
  2615                     }
  2616                 }
  2617             }
  2618         }
  2619         break;
  2620 
  2621     case 2:
  2622         {
  2623             Uint16 *pixels;
  2624             for (y = 0; y < icon->h; ++y) {
  2625                 pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
  2626                 for (x = 0; x < icon->w; ++x) {
  2627                     if ((flags & 1) && *pixels == colorkey) {
  2628                         SET_MASKBIT(icon, x, y, mask);
  2629                     } else if ((flags & 2)
  2630                                && (*pixels & icon->format->Amask) == 0) {
  2631                         SET_MASKBIT(icon, x, y, mask);
  2632                     }
  2633                     pixels++;
  2634                 }
  2635             }
  2636         }
  2637         break;
  2638 
  2639     case 4:
  2640         {
  2641             Uint32 *pixels;
  2642             for (y = 0; y < icon->h; ++y) {
  2643                 pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
  2644                 for (x = 0; x < icon->w; ++x) {
  2645                     if ((flags & 1) && *pixels == colorkey) {
  2646                         SET_MASKBIT(icon, x, y, mask);
  2647                     } else if ((flags & 2)
  2648                                && (*pixels & icon->format->Amask) == 0) {
  2649                         SET_MASKBIT(icon, x, y, mask);
  2650                     }
  2651                     pixels++;
  2652                 }
  2653             }
  2654         }
  2655         break;
  2656     }
  2657 }
  2658 
  2659 /*
  2660  * Sets the window manager icon for the display window.
  2661  */
  2662 void
  2663 SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
  2664 {
  2665     if (icon && _this->SetIcon) {
  2666         /* Generate a mask if necessary, and create the icon! */
  2667         if (mask == NULL) {
  2668             int mask_len = icon->h * (icon->w + 7) / 8;
  2669             int flags = 0;
  2670             mask = (Uint8 *) SDL_malloc(mask_len);
  2671             if (mask == NULL) {
  2672                 return;
  2673             }
  2674             SDL_memset(mask, ~0, mask_len);
  2675             if (icon->flags & SDL_SRCCOLORKEY)
  2676                 flags |= 1;
  2677             if (icon->flags & SDL_SRCALPHA)
  2678                 flags |= 2;
  2679             if (flags) {
  2680                 CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  2681             }
  2682             _this->SetIcon(_this, icon, mask);
  2683             SDL_free(mask);
  2684         } else {
  2685             _this->SetIcon(_this, icon, mask);
  2686         }
  2687     }
  2688 }
  2689 #endif
  2690 
  2691 SDL_bool
  2692 SDL_GetWindowWMInfo(SDL_WindowID windowID, struct SDL_SysWMinfo *info)
  2693 {
  2694     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2695 
  2696     if (!window || !_this->GetWindowWMInfo) {
  2697         return SDL_FALSE;
  2698     }
  2699     return (_this->GetWindowWMInfo(_this, window, info));
  2700 }
  2701 
  2702 /* vi: set ts=4 sw=4 expandtab: */