src/video/SDL_video.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 19 Jun 2007 05:53:56 +0000
changeset 2130 3ee59c43d784
parent 2119 9341a884a4d9
child 2222 926294b2bb4e
permissions -rw-r--r--
Fixes for compiling with Visual C++ 8.0 Express Edition
     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->renderer) {
  1333                 SDL_DestroyRenderer(window->id);
  1334             }
  1335             if (_this->DestroyWindow) {
  1336                 _this->DestroyWindow(_this, window);
  1337             }
  1338             if (window->title) {
  1339                 SDL_free(window->title);
  1340             }
  1341             if (j != display->num_windows - 1) {
  1342                 SDL_memcpy(&display->windows[i],
  1343                            &display->windows[i + 1],
  1344                            (display->num_windows - i - 1) * sizeof(*window));
  1345             }
  1346             --display->num_windows;
  1347             return;
  1348         }
  1349     }
  1350 }
  1351 
  1352 void
  1353 SDL_AddRenderDriver(int displayIndex, const SDL_RenderDriver * driver)
  1354 {
  1355     SDL_VideoDisplay *display;
  1356     SDL_RenderDriver *render_drivers;
  1357 
  1358     if (displayIndex >= _this->num_displays) {
  1359         return;
  1360     }
  1361     display = &_this->displays[displayIndex];
  1362 
  1363     render_drivers =
  1364         SDL_realloc(display->render_drivers,
  1365                     (display->num_render_drivers +
  1366                      1) * sizeof(*render_drivers));
  1367     if (render_drivers) {
  1368         render_drivers[display->num_render_drivers] = *driver;
  1369         display->render_drivers = render_drivers;
  1370         display->num_render_drivers++;
  1371     }
  1372 }
  1373 
  1374 int
  1375 SDL_GetNumRenderDrivers(void)
  1376 {
  1377     if (_this) {
  1378         return SDL_CurrentDisplay.num_render_drivers;
  1379     }
  1380     return 0;
  1381 }
  1382 
  1383 int
  1384 SDL_GetRenderDriverInfo(int index, SDL_RendererInfo * info)
  1385 {
  1386     if (!_this) {
  1387         SDL_UninitializedVideo();
  1388         return -1;
  1389     }
  1390 
  1391     if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
  1392         SDL_SetError("index must be in the range of 0 - %d",
  1393                      SDL_GetNumRenderDrivers() - 1);
  1394         return -1;
  1395     }
  1396     *info = SDL_CurrentDisplay.render_drivers[index].info;
  1397     return 0;
  1398 }
  1399 
  1400 int
  1401 SDL_CreateRenderer(SDL_WindowID windowID, int index, Uint32 flags)
  1402 {
  1403     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1404 
  1405     if (!window) {
  1406         return 0;
  1407     }
  1408 
  1409     if (index < 0) {
  1410         const char *override = SDL_getenv("SDL_VIDEO_RENDERER");
  1411         int n = SDL_GetNumRenderDrivers();
  1412         for (index = 0; index < n; ++index) {
  1413             SDL_RenderDriver *driver =
  1414                 &SDL_CurrentDisplay.render_drivers[index];
  1415 
  1416             if (override) {
  1417                 if (SDL_strcasecmp(override, driver->info.name) == 0) {
  1418                     break;
  1419                 }
  1420             } else {
  1421                 if ((driver->info.flags & flags) == flags) {
  1422                     break;
  1423                 }
  1424             }
  1425         }
  1426         if (index == n) {
  1427             SDL_SetError("Couldn't find matching render driver");
  1428             return -1;
  1429         }
  1430     }
  1431 
  1432     if (index >= SDL_GetNumRenderDrivers()) {
  1433         SDL_SetError("index must be -1 or in the range of 0 - %d",
  1434                      SDL_GetNumRenderDrivers() - 1);
  1435         return -1;
  1436     }
  1437 
  1438     /* Free any existing renderer */
  1439     SDL_DestroyRenderer(windowID);
  1440 
  1441     /* Create a new renderer instance */
  1442     window->renderer =
  1443         SDL_CurrentDisplay.render_drivers[index].CreateRenderer(window,
  1444                                                                 flags);
  1445     SDL_SelectRenderer(window->id);
  1446 
  1447     return 0;
  1448 }
  1449 
  1450 int
  1451 SDL_SelectRenderer(SDL_WindowID windowID)
  1452 {
  1453     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1454     SDL_Renderer *renderer;
  1455 
  1456     if (!window || !window->renderer) {
  1457         return -1;
  1458     }
  1459     renderer = window->renderer;
  1460     if (renderer && renderer->ActivateRenderer) {
  1461         if (renderer->ActivateRenderer(renderer) < 0) {
  1462             return -1;
  1463         }
  1464     }
  1465     SDL_CurrentDisplay.current_renderer = renderer;
  1466     return 0;
  1467 }
  1468 
  1469 int
  1470 SDL_GetRendererInfo(SDL_RendererInfo * info)
  1471 {
  1472     if (!_this) {
  1473         SDL_UninitializedVideo();
  1474         return -1;
  1475     }
  1476 
  1477     if (!SDL_CurrentDisplay.current_renderer) {
  1478         SDL_SetError("There is no current renderer");
  1479         return -1;
  1480     }
  1481     *info = SDL_CurrentDisplay.current_renderer->info;
  1482     return 0;
  1483 }
  1484 
  1485 SDL_TextureID
  1486 SDL_CreateTexture(Uint32 format, int access, int w, int h)
  1487 {
  1488     int hash;
  1489     SDL_Renderer *renderer;
  1490     SDL_Texture *texture;
  1491 
  1492     if (!_this) {
  1493         SDL_UninitializedVideo();
  1494         return 0;
  1495     }
  1496 
  1497     renderer = SDL_CurrentDisplay.current_renderer;
  1498     if (!renderer || !renderer->CreateTexture) {
  1499         return 0;
  1500     }
  1501 
  1502     texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
  1503     if (!texture) {
  1504         SDL_OutOfMemory();
  1505         return 0;
  1506     }
  1507 
  1508     texture->id = _this->next_object_id++;
  1509     texture->format = format;
  1510     texture->access = access;
  1511     texture->w = w;
  1512     texture->h = h;
  1513     texture->r = 255;
  1514     texture->g = 255;
  1515     texture->b = 255;
  1516     texture->a = 255;
  1517     texture->renderer = renderer;
  1518 
  1519     if (renderer->CreateTexture(renderer, texture) < 0) {
  1520         if (renderer->DestroyTexture) {
  1521             renderer->DestroyTexture(renderer, texture);
  1522         }
  1523         SDL_free(texture);
  1524         return 0;
  1525     }
  1526 
  1527     hash = (texture->id % SDL_arraysize(SDL_CurrentDisplay.textures));
  1528     texture->next = SDL_CurrentDisplay.textures[hash];
  1529     SDL_CurrentDisplay.textures[hash] = texture;
  1530 
  1531     return texture->id;
  1532 }
  1533 
  1534 SDL_TextureID
  1535 SDL_CreateTextureFromSurface(Uint32 format, int access, SDL_Surface * surface)
  1536 {
  1537     SDL_TextureID textureID;
  1538     Uint32 surface_flags = surface->flags;
  1539     SDL_PixelFormat *fmt = surface->format;
  1540     Uint8 alpha;
  1541     SDL_Rect bounds;
  1542     SDL_Surface dst;
  1543     int bpp;
  1544     Uint32 Rmask, Gmask, Bmask, Amask;
  1545 
  1546     if (!surface) {
  1547         SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
  1548         return 0;
  1549     }
  1550 
  1551     if (format) {
  1552         if (!SDL_PixelFormatEnumToMasks
  1553             (format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
  1554             SDL_SetError("Unknown pixel format");
  1555             return 0;
  1556         }
  1557     } else {
  1558         if (fmt->Amask || !(surface_flags & (SDL_SRCCOLORKEY | SDL_SRCALPHA))) {
  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 = SDL_CreateTexture(format, access, surface->w, surface->h);
  1580     if (!textureID) {
  1581         return 0;
  1582     }
  1583 
  1584     /* Set up a destination surface for the texture update */
  1585     SDL_zero(dst);
  1586     dst.format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
  1587     if (!dst.format) {
  1588         SDL_DestroyTexture(textureID);
  1589         return 0;
  1590     }
  1591     dst.w = surface->w;
  1592     dst.h = surface->h;
  1593     if (SDL_LockTexture(textureID, NULL, 1, &dst.pixels, &dst.pitch) == 0) {
  1594         dst.flags |= SDL_PREALLOC;
  1595     } else {
  1596         dst.pitch = SDL_CalculatePitch(&dst);
  1597         dst.pixels = SDL_malloc(dst.h * dst.pitch);
  1598         if (!dst.pixels) {
  1599             SDL_DestroyTexture(textureID);
  1600             SDL_FreeFormat(dst.format);
  1601             SDL_OutOfMemory();
  1602             return 0;
  1603         }
  1604     }
  1605 
  1606     /* Copy the palette if any */
  1607     if (SDL_ISPIXELFORMAT_INDEXED(format)) {
  1608         if (fmt->palette) {
  1609             SDL_SetTexturePalette(textureID, fmt->palette->colors, 0,
  1610                                   fmt->palette->ncolors);
  1611             SDL_SetSurfacePalette(&dst, fmt->palette);
  1612         } else {
  1613             dst.format->palette =
  1614                 SDL_AllocPalette((1 << SDL_BITSPERPIXEL(format)));
  1615             if (!dst.format->palette) {
  1616                 SDL_DestroyTexture(textureID);
  1617                 SDL_FreeFormat(dst.format);
  1618                 return 0;
  1619             }
  1620             SDL_DitherColors(dst.format->palette->colors,
  1621                              SDL_BITSPERPIXEL(format));
  1622         }
  1623     }
  1624 
  1625     /* Make the texture transparent if the surface has colorkey */
  1626     if (surface_flags & SDL_SRCCOLORKEY) {
  1627         int row;
  1628         int length = dst.w * dst.format->BytesPerPixel;
  1629         Uint8 *p = (Uint8 *) dst.pixels;
  1630         for (row = 0; row < dst.h; ++row) {
  1631             SDL_memset(p, 0, length);
  1632             p += dst.pitch;
  1633         }
  1634     }
  1635 
  1636     /* Copy over the alpha channel */
  1637     if (surface_flags & SDL_SRCALPHA) {
  1638         if (fmt->Amask) {
  1639             surface->flags &= ~SDL_SRCALPHA;
  1640         } else {
  1641             /* FIXME: Need to make sure the texture has an alpha channel
  1642              *        and copy 'alpha' into the texture alpha channel.
  1643              */
  1644             alpha = surface->format->alpha;
  1645             SDL_SetAlpha(surface, 0, 0);
  1646         }
  1647     }
  1648 
  1649     /* Copy over the image data */
  1650     bounds.x = 0;
  1651     bounds.y = 0;
  1652     bounds.w = surface->w;
  1653     bounds.h = surface->h;
  1654     SDL_LowerBlit(surface, &bounds, &dst, &bounds);
  1655 
  1656     /* Clean up the original surface */
  1657     if ((surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA) {
  1658         Uint32 aflags = surface_flags & (SDL_SRCALPHA | SDL_RLEACCELOK);
  1659         if (fmt->Amask) {
  1660             surface->flags |= SDL_SRCALPHA;
  1661         } else {
  1662             SDL_SetAlpha(surface, aflags, alpha);
  1663         }
  1664     }
  1665 
  1666     /* Update the texture */
  1667     if (dst.flags & SDL_PREALLOC) {
  1668         SDL_UnlockTexture(textureID);
  1669     } else {
  1670         SDL_UpdateTexture(textureID, NULL, dst.pixels, dst.pitch);
  1671         SDL_free(dst.pixels);
  1672     }
  1673     SDL_FreeFormat(dst.format);
  1674 
  1675     return textureID;
  1676 }
  1677 
  1678 static __inline__ SDL_Texture *
  1679 SDL_GetTextureFromID(SDL_TextureID textureID)
  1680 {
  1681     int hash;
  1682     SDL_Texture *texture;
  1683 
  1684     if (!_this) {
  1685         return NULL;
  1686     }
  1687 
  1688     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  1689     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  1690          texture = texture->next) {
  1691         if (texture->id == textureID) {
  1692             return texture;
  1693         }
  1694     }
  1695     return NULL;
  1696 }
  1697 
  1698 int
  1699 SDL_QueryTexture(SDL_TextureID textureID, Uint32 * format, int *access,
  1700                  int *w, int *h)
  1701 {
  1702     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1703 
  1704     if (!texture) {
  1705         return -1;
  1706     }
  1707 
  1708     if (format) {
  1709         *format = texture->format;
  1710     }
  1711     if (access) {
  1712         *access = texture->access;
  1713     }
  1714     if (w) {
  1715         *w = texture->w;
  1716     }
  1717     if (h) {
  1718         *h = texture->h;
  1719     }
  1720     return 0;
  1721 }
  1722 
  1723 int
  1724 SDL_QueryTexturePixels(SDL_TextureID textureID, void **pixels, int *pitch)
  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->QueryTexturePixels) {
  1735         return -1;
  1736     }
  1737     return renderer->QueryTexturePixels(renderer, texture, pixels, pitch);
  1738 }
  1739 
  1740 int
  1741 SDL_SetTexturePalette(SDL_TextureID textureID, const SDL_Color * colors,
  1742                       int firstcolor, int ncolors)
  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->SetTexturePalette) {
  1753         return -1;
  1754     }
  1755     return renderer->SetTexturePalette(renderer, texture, colors, firstcolor,
  1756                                        ncolors);
  1757 }
  1758 
  1759 int
  1760 SDL_GetTexturePalette(SDL_TextureID textureID, SDL_Color * colors,
  1761                       int firstcolor, int ncolors)
  1762 {
  1763     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1764     SDL_Renderer *renderer;
  1765 
  1766     if (!texture) {
  1767         return -1;
  1768     }
  1769 
  1770     renderer = texture->renderer;
  1771     if (!renderer->GetTexturePalette) {
  1772         return -1;
  1773     }
  1774     return renderer->GetTexturePalette(renderer, texture, colors, firstcolor,
  1775                                        ncolors);
  1776 }
  1777 
  1778 int
  1779 SDL_SetTextureColorMod(SDL_TextureID textureID, Uint8 r, Uint8 g, Uint8 b)
  1780 {
  1781     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1782     SDL_Renderer *renderer;
  1783 
  1784     if (!texture) {
  1785         return -1;
  1786     }
  1787 
  1788     renderer = texture->renderer;
  1789     if (!renderer->SetTextureColorMod) {
  1790         return -1;
  1791     }
  1792     if (r < 255 || g < 255 || b < 255) {
  1793         texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
  1794     } else {
  1795         texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
  1796     }
  1797     texture->r = r;
  1798     texture->g = g;
  1799     texture->b = b;
  1800     return renderer->SetTextureColorMod(renderer, texture);
  1801 }
  1802 
  1803 int
  1804 SDL_GetTextureColorMod(SDL_TextureID textureID, Uint8 * r, Uint8 * g,
  1805                        Uint8 * b)
  1806 {
  1807     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1808     SDL_Renderer *renderer;
  1809 
  1810     if (!texture) {
  1811         return -1;
  1812     }
  1813 
  1814     renderer = texture->renderer;
  1815     if (r) {
  1816         *r = texture->r;
  1817     }
  1818     if (g) {
  1819         *g = texture->g;
  1820     }
  1821     if (b) {
  1822         *b = texture->b;
  1823     }
  1824     return 0;
  1825 }
  1826 
  1827 int
  1828 SDL_SetTextureAlphaMod(SDL_TextureID textureID, Uint8 alpha)
  1829 {
  1830     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1831     SDL_Renderer *renderer;
  1832 
  1833     if (!texture) {
  1834         return -1;
  1835     }
  1836 
  1837     renderer = texture->renderer;
  1838     if (!renderer->SetTextureAlphaMod) {
  1839         return -1;
  1840     }
  1841     if (alpha < 255) {
  1842         texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
  1843     } else {
  1844         texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
  1845     }
  1846     texture->a = alpha;
  1847     return renderer->SetTextureAlphaMod(renderer, texture);
  1848 }
  1849 
  1850 int
  1851 SDL_GetTextureAlphaMod(SDL_TextureID textureID, Uint8 * alpha)
  1852 {
  1853     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1854 
  1855     if (!texture) {
  1856         return -1;
  1857     }
  1858 
  1859     if (alpha) {
  1860         *alpha = texture->a;
  1861     }
  1862     return 0;
  1863 }
  1864 
  1865 int
  1866 SDL_SetTextureBlendMode(SDL_TextureID textureID, int blendMode)
  1867 {
  1868     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1869     SDL_Renderer *renderer;
  1870 
  1871     if (!texture) {
  1872         return -1;
  1873     }
  1874 
  1875     renderer = texture->renderer;
  1876     if (!renderer->SetTextureBlendMode) {
  1877         return -1;
  1878     }
  1879     texture->blendMode = blendMode;
  1880     return renderer->SetTextureBlendMode(renderer, texture);
  1881 }
  1882 
  1883 int
  1884 SDL_GetTextureBlendMode(SDL_TextureID textureID, int *blendMode)
  1885 {
  1886     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1887 
  1888     if (!texture) {
  1889         return -1;
  1890     }
  1891 
  1892     if (blendMode) {
  1893         *blendMode = texture->blendMode;
  1894     }
  1895     return 0;
  1896 }
  1897 
  1898 int
  1899 SDL_SetTextureScaleMode(SDL_TextureID textureID, int scaleMode)
  1900 {
  1901     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1902     SDL_Renderer *renderer;
  1903 
  1904     if (!texture) {
  1905         return -1;
  1906     }
  1907 
  1908     renderer = texture->renderer;
  1909     if (!renderer->SetTextureScaleMode) {
  1910         return -1;
  1911     }
  1912     texture->scaleMode = scaleMode;
  1913     return renderer->SetTextureScaleMode(renderer, texture);
  1914 }
  1915 
  1916 int
  1917 SDL_GetTextureScaleMode(SDL_TextureID textureID, int *scaleMode)
  1918 {
  1919     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1920 
  1921     if (!texture) {
  1922         return -1;
  1923     }
  1924 
  1925     if (scaleMode) {
  1926         *scaleMode = texture->scaleMode;
  1927     }
  1928     return 0;
  1929 }
  1930 
  1931 int
  1932 SDL_UpdateTexture(SDL_TextureID textureID, const SDL_Rect * rect,
  1933                   const void *pixels, int pitch)
  1934 {
  1935     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1936     SDL_Renderer *renderer;
  1937     SDL_Rect full_rect;
  1938 
  1939     if (!texture) {
  1940         return -1;
  1941     }
  1942 
  1943     renderer = texture->renderer;
  1944     if (!renderer->UpdateTexture) {
  1945         return -1;
  1946     }
  1947 
  1948     if (!rect) {
  1949         full_rect.x = 0;
  1950         full_rect.y = 0;
  1951         full_rect.w = texture->w;
  1952         full_rect.h = texture->h;
  1953         rect = &full_rect;
  1954     }
  1955 
  1956     return renderer->UpdateTexture(renderer, texture, rect, pixels, pitch);
  1957 }
  1958 
  1959 int
  1960 SDL_LockTexture(SDL_TextureID textureID, const SDL_Rect * rect, int markDirty,
  1961                 void **pixels, int *pitch)
  1962 {
  1963     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1964     SDL_Renderer *renderer;
  1965     SDL_Rect full_rect;
  1966 
  1967     if (!texture) {
  1968         return -1;
  1969     }
  1970 
  1971     renderer = texture->renderer;
  1972     if (!renderer->LockTexture) {
  1973         return -1;
  1974     }
  1975 
  1976     if (!rect) {
  1977         full_rect.x = 0;
  1978         full_rect.y = 0;
  1979         full_rect.w = texture->w;
  1980         full_rect.h = texture->h;
  1981         rect = &full_rect;
  1982     }
  1983 
  1984     return renderer->LockTexture(renderer, texture, rect, markDirty, pixels,
  1985                                  pitch);
  1986 }
  1987 
  1988 void
  1989 SDL_UnlockTexture(SDL_TextureID textureID)
  1990 {
  1991     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1992     SDL_Renderer *renderer;
  1993 
  1994     if (!texture) {
  1995         return;
  1996     }
  1997 
  1998     renderer = texture->renderer;
  1999     if (!renderer->UnlockTexture) {
  2000         return;
  2001     }
  2002     renderer->UnlockTexture(renderer, texture);
  2003 }
  2004 
  2005 void
  2006 SDL_DirtyTexture(SDL_TextureID textureID, int numrects,
  2007                  const SDL_Rect * rects)
  2008 {
  2009     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2010     SDL_Renderer *renderer;
  2011 
  2012     if (!texture) {
  2013         return;
  2014     }
  2015 
  2016     renderer = texture->renderer;
  2017     if (!renderer->DirtyTexture) {
  2018         return;
  2019     }
  2020     renderer->DirtyTexture(renderer, texture, numrects, rects);
  2021 }
  2022 
  2023 int
  2024 SDL_RenderFill(Uint8 r, Uint8 g, Uint8 b, Uint8 a, const SDL_Rect * rect)
  2025 {
  2026     SDL_Renderer *renderer;
  2027     SDL_Window *window;
  2028     SDL_Rect real_rect;
  2029 
  2030     if (!_this) {
  2031         SDL_UninitializedVideo();
  2032         return -1;
  2033     }
  2034 
  2035     renderer = SDL_CurrentDisplay.current_renderer;
  2036     if (!renderer || !renderer->RenderFill) {
  2037         return -1;
  2038     }
  2039 
  2040     window = SDL_GetWindowFromID(renderer->window);
  2041     real_rect.x = 0;
  2042     real_rect.y = 0;
  2043     real_rect.w = window->w;
  2044     real_rect.h = window->h;
  2045     if (rect) {
  2046         if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
  2047             return 0;
  2048         }
  2049     }
  2050 
  2051     return renderer->RenderFill(renderer, r, g, b, a, &real_rect);
  2052 }
  2053 
  2054 int
  2055 SDL_RenderCopy(SDL_TextureID textureID, const SDL_Rect * srcrect,
  2056                const SDL_Rect * dstrect)
  2057 {
  2058     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2059     SDL_Renderer *renderer;
  2060     SDL_Window *window;
  2061     SDL_Rect real_srcrect;
  2062     SDL_Rect real_dstrect;
  2063 
  2064     if (!texture || texture->renderer != SDL_CurrentDisplay.current_renderer) {
  2065         return -1;
  2066     }
  2067 
  2068     renderer = SDL_CurrentDisplay.current_renderer;
  2069     if (!renderer || !renderer->RenderCopy) {
  2070         return -1;
  2071     }
  2072 
  2073     window = SDL_GetWindowFromID(renderer->window);
  2074     if (srcrect) {
  2075         real_srcrect = *srcrect;
  2076     } else {
  2077         real_srcrect.x = 0;
  2078         real_srcrect.y = 0;
  2079         real_srcrect.w = texture->w;
  2080         real_srcrect.h = texture->h;
  2081     }
  2082     if (dstrect) {
  2083         real_dstrect = *dstrect;
  2084     } else {
  2085         real_dstrect.x = 0;
  2086         real_dstrect.y = 0;
  2087         real_dstrect.w = window->w;
  2088         real_dstrect.h = window->h;
  2089     }
  2090 
  2091     return renderer->RenderCopy(renderer, texture, &real_srcrect,
  2092                                 &real_dstrect);
  2093 }
  2094 
  2095 void
  2096 SDL_RenderPresent(void)
  2097 {
  2098     SDL_Renderer *renderer;
  2099 
  2100     if (!_this) {
  2101         SDL_UninitializedVideo();
  2102         return;
  2103     }
  2104 
  2105     renderer = SDL_CurrentDisplay.current_renderer;
  2106     if (!renderer || !renderer->RenderPresent) {
  2107         return;
  2108     }
  2109     renderer->RenderPresent(renderer);
  2110 }
  2111 
  2112 void
  2113 SDL_DestroyTexture(SDL_TextureID textureID)
  2114 {
  2115     int hash;
  2116     SDL_Texture *prev, *texture;
  2117     SDL_Renderer *renderer;
  2118 
  2119     if (!_this) {
  2120         SDL_UninitializedVideo();
  2121         return;
  2122     }
  2123 
  2124     /* Look up the texture in the hash table */
  2125     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  2126     prev = NULL;
  2127     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  2128          prev = texture, texture = texture->next) {
  2129         if (texture->id == textureID) {
  2130             break;
  2131         }
  2132     }
  2133     if (!texture) {
  2134         return;
  2135     }
  2136 
  2137     /* Unlink the texture from the list */
  2138     if (prev) {
  2139         prev->next = texture->next;
  2140     } else {
  2141         SDL_CurrentDisplay.textures[hash] = texture->next;
  2142     }
  2143 
  2144     /* Free the texture */
  2145     renderer = texture->renderer;
  2146     renderer->DestroyTexture(renderer, texture);
  2147     SDL_free(texture);
  2148 }
  2149 
  2150 void
  2151 SDL_DestroyRenderer(SDL_WindowID windowID)
  2152 {
  2153     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2154     SDL_Renderer *renderer;
  2155     int i;
  2156 
  2157     if (!window) {
  2158         return;
  2159     }
  2160 
  2161     renderer = window->renderer;
  2162     if (!renderer) {
  2163         return;
  2164     }
  2165 
  2166     /* Free existing textures for this renderer */
  2167     for (i = 0; i < SDL_arraysize(SDL_CurrentDisplay.textures); ++i) {
  2168         SDL_Texture *texture;
  2169         SDL_Texture *prev = NULL;
  2170         SDL_Texture *next;
  2171         for (texture = SDL_CurrentDisplay.textures[i]; texture;
  2172              texture = next) {
  2173             next = texture->next;
  2174             if (texture->renderer == renderer) {
  2175                 if (prev) {
  2176                     prev->next = next;
  2177                 } else {
  2178                     SDL_CurrentDisplay.textures[i] = next;
  2179                 }
  2180                 renderer->DestroyTexture(renderer, texture);
  2181                 SDL_free(texture);
  2182             } else {
  2183                 prev = texture;
  2184             }
  2185         }
  2186     }
  2187 
  2188     /* Free the renderer instance */
  2189     renderer->DestroyRenderer(renderer);
  2190 
  2191     /* Clear references */
  2192     window->renderer = NULL;
  2193     if (SDL_CurrentDisplay.current_renderer == renderer) {
  2194         SDL_CurrentDisplay.current_renderer = NULL;
  2195     }
  2196 }
  2197 
  2198 void
  2199 SDL_VideoQuit(void)
  2200 {
  2201     int i, j;
  2202 
  2203     if (!_this) {
  2204         return;
  2205     }
  2206 
  2207     /* Halt event processing before doing anything else */
  2208     SDL_StopEventLoop();
  2209 
  2210     /* Clean up the system video */
  2211     for (i = _this->num_displays; i--;) {
  2212         SDL_VideoDisplay *display = &_this->displays[i];
  2213         for (j = display->num_windows; j--;) {
  2214             SDL_DestroyWindow(display->windows[i].id);
  2215         }
  2216         if (display->windows) {
  2217             SDL_free(display->windows);
  2218             display->windows = NULL;
  2219         }
  2220         display->num_windows = 0;
  2221     }
  2222     _this->VideoQuit(_this);
  2223 
  2224     for (i = _this->num_displays; i--;) {
  2225         SDL_VideoDisplay *display = &_this->displays[i];
  2226         for (j = display->num_display_modes; j--;) {
  2227             if (display->display_modes[j].driverdata) {
  2228                 SDL_free(display->display_modes[j].driverdata);
  2229                 display->display_modes[j].driverdata = NULL;
  2230             }
  2231         }
  2232         if (display->display_modes) {
  2233             SDL_free(display->display_modes);
  2234             display->display_modes = NULL;
  2235         }
  2236         if (display->desktop_mode.driverdata) {
  2237             SDL_free(display->desktop_mode.driverdata);
  2238             display->desktop_mode.driverdata = NULL;
  2239         }
  2240         if (display->palette) {
  2241             SDL_FreePalette(display->palette);
  2242             display->palette = NULL;
  2243         }
  2244         if (display->gamma) {
  2245             SDL_free(display->gamma);
  2246         }
  2247         if (display->driverdata) {
  2248             SDL_free(display->driverdata);
  2249         }
  2250     }
  2251     if (_this->displays) {
  2252         SDL_free(_this->displays);
  2253         _this->displays = NULL;
  2254     }
  2255     _this->free(_this);
  2256     _this = NULL;
  2257 }
  2258 
  2259 int
  2260 SDL_GL_LoadLibrary(const char *path)
  2261 {
  2262     int retval;
  2263 
  2264     if (!_this) {
  2265         SDL_UninitializedVideo();
  2266         return -1;
  2267     }
  2268 
  2269     if (_this->GL_LoadLibrary) {
  2270         retval = _this->GL_LoadLibrary(_this, path);
  2271     } else {
  2272         SDL_SetError("No dynamic GL support in video driver");
  2273         retval = -1;
  2274     }
  2275     return (retval);
  2276 }
  2277 
  2278 void *
  2279 SDL_GL_GetProcAddress(const char *proc)
  2280 {
  2281     void *func;
  2282 
  2283     if (!_this) {
  2284         SDL_UninitializedVideo();
  2285         return NULL;
  2286     }
  2287 
  2288     func = NULL;
  2289     if (_this->GL_GetProcAddress) {
  2290         if (_this->gl_config.driver_loaded) {
  2291             func = _this->GL_GetProcAddress(_this, proc);
  2292         } else {
  2293             SDL_SetError("No GL driver has been loaded");
  2294         }
  2295     } else {
  2296         SDL_SetError("No dynamic GL support in video driver");
  2297     }
  2298     return func;
  2299 }
  2300 
  2301 SDL_bool
  2302 SDL_GL_ExtensionSupported(const char *extension)
  2303 {
  2304 #if SDL_VIDEO_OPENGL
  2305     const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
  2306     const char *extensions;
  2307     const char *start;
  2308     const char *where, *terminator;
  2309 
  2310     /* Extension names should not have spaces. */
  2311     where = SDL_strchr(extension, ' ');
  2312     if (where || *extension == '\0') {
  2313         return SDL_FALSE;
  2314     }
  2315 
  2316     /* See if there's an environment variable override */
  2317     start = SDL_getenv(extension);
  2318     if (start && *start == '0') {
  2319         return SDL_FALSE;
  2320     }
  2321 
  2322     /* Lookup the available extensions */
  2323     glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
  2324     if (glGetStringFunc) {
  2325         extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
  2326     } else {
  2327         extensions = NULL;
  2328     }
  2329     if (!extensions) {
  2330         return SDL_FALSE;
  2331     }
  2332 
  2333     /* It takes a bit of care to be fool-proof about parsing the
  2334      * OpenGL extensions string. Don't be fooled by sub-strings,
  2335      * etc. */
  2336 
  2337     start = extensions;
  2338 
  2339     for (;;) {
  2340         where = SDL_strstr(start, extension);
  2341         if (!where)
  2342             break;
  2343 
  2344         terminator = where + SDL_strlen(extension);
  2345         if (where == start || *(where - 1) == ' ')
  2346             if (*terminator == ' ' || *terminator == '\0')
  2347                 return SDL_TRUE;
  2348 
  2349         start = terminator;
  2350     }
  2351     return SDL_FALSE;
  2352 #else
  2353     return SDL_FALSE;
  2354 #endif
  2355 }
  2356 
  2357 int
  2358 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
  2359 {
  2360 #if SDL_VIDEO_OPENGL
  2361     int retval;
  2362 
  2363     if (!_this) {
  2364         SDL_UninitializedVideo();
  2365         return -1;
  2366     }
  2367 
  2368     retval = 0;
  2369     switch (attr) {
  2370     case SDL_GL_RED_SIZE:
  2371         _this->gl_config.red_size = value;
  2372         break;
  2373     case SDL_GL_GREEN_SIZE:
  2374         _this->gl_config.green_size = value;
  2375         break;
  2376     case SDL_GL_BLUE_SIZE:
  2377         _this->gl_config.blue_size = value;
  2378         break;
  2379     case SDL_GL_ALPHA_SIZE:
  2380         _this->gl_config.alpha_size = value;
  2381         break;
  2382     case SDL_GL_DOUBLEBUFFER:
  2383         _this->gl_config.double_buffer = value;
  2384         break;
  2385     case SDL_GL_BUFFER_SIZE:
  2386         _this->gl_config.buffer_size = value;
  2387         break;
  2388     case SDL_GL_DEPTH_SIZE:
  2389         _this->gl_config.depth_size = value;
  2390         break;
  2391     case SDL_GL_STENCIL_SIZE:
  2392         _this->gl_config.stencil_size = value;
  2393         break;
  2394     case SDL_GL_ACCUM_RED_SIZE:
  2395         _this->gl_config.accum_red_size = value;
  2396         break;
  2397     case SDL_GL_ACCUM_GREEN_SIZE:
  2398         _this->gl_config.accum_green_size = value;
  2399         break;
  2400     case SDL_GL_ACCUM_BLUE_SIZE:
  2401         _this->gl_config.accum_blue_size = value;
  2402         break;
  2403     case SDL_GL_ACCUM_ALPHA_SIZE:
  2404         _this->gl_config.accum_alpha_size = value;
  2405         break;
  2406     case SDL_GL_STEREO:
  2407         _this->gl_config.stereo = value;
  2408         break;
  2409     case SDL_GL_MULTISAMPLEBUFFERS:
  2410         _this->gl_config.multisamplebuffers = value;
  2411         break;
  2412     case SDL_GL_MULTISAMPLESAMPLES:
  2413         _this->gl_config.multisamplesamples = value;
  2414         break;
  2415     case SDL_GL_ACCELERATED_VISUAL:
  2416         _this->gl_config.accelerated = value;
  2417         break;
  2418     default:
  2419         SDL_SetError("Unknown OpenGL attribute");
  2420         retval = -1;
  2421         break;
  2422     }
  2423     return retval;
  2424 #else
  2425     SDL_Unsupported();
  2426     return -1;
  2427 #endif /* SDL_VIDEO_OPENGL */
  2428 }
  2429 
  2430 int
  2431 SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
  2432 {
  2433 #if SDL_VIDEO_OPENGL
  2434     void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2435     GLenum attrib = 0;
  2436 
  2437     glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2438     if (!glGetIntegervFunc) {
  2439         return -1;
  2440     }
  2441     switch (attr) {
  2442     case SDL_GL_RED_SIZE:
  2443         attrib = GL_RED_BITS;
  2444         break;
  2445     case SDL_GL_BLUE_SIZE:
  2446         attrib = GL_BLUE_BITS;
  2447         break;
  2448     case SDL_GL_GREEN_SIZE:
  2449         attrib = GL_GREEN_BITS;
  2450         break;
  2451     case SDL_GL_ALPHA_SIZE:
  2452         attrib = GL_ALPHA_BITS;
  2453         break;
  2454     case SDL_GL_DOUBLEBUFFER:
  2455         attrib = GL_DOUBLEBUFFER;
  2456         break;
  2457     case SDL_GL_DEPTH_SIZE:
  2458         attrib = GL_DEPTH_BITS;
  2459         break;
  2460     case SDL_GL_STENCIL_SIZE:
  2461         attrib = GL_STENCIL_BITS;
  2462         break;
  2463     case SDL_GL_ACCUM_RED_SIZE:
  2464         attrib = GL_ACCUM_RED_BITS;
  2465         break;
  2466     case SDL_GL_ACCUM_GREEN_SIZE:
  2467         attrib = GL_ACCUM_GREEN_BITS;
  2468         break;
  2469     case SDL_GL_ACCUM_BLUE_SIZE:
  2470         attrib = GL_ACCUM_BLUE_BITS;
  2471         break;
  2472     case SDL_GL_ACCUM_ALPHA_SIZE:
  2473         attrib = GL_ACCUM_ALPHA_BITS;
  2474         break;
  2475     case SDL_GL_STEREO:
  2476         attrib = GL_STEREO;
  2477         break;
  2478     case SDL_GL_MULTISAMPLEBUFFERS:
  2479         attrib = GL_SAMPLE_BUFFERS_ARB;
  2480         break;
  2481     case SDL_GL_MULTISAMPLESAMPLES:
  2482         attrib = GL_SAMPLES_ARB;
  2483         break;
  2484     case SDL_GL_BUFFER_SIZE:
  2485         {
  2486             GLint bits = 0;
  2487             GLint component;
  2488 
  2489             /* there doesn't seem to be a single flag in OpenGL for this! */
  2490             glGetIntegervFunc(GL_RED_BITS, &component);
  2491             bits += component;
  2492             glGetIntegervFunc(GL_GREEN_BITS, &component);
  2493             bits += component;
  2494             glGetIntegervFunc(GL_BLUE_BITS, &component);
  2495             bits += component;
  2496             glGetIntegervFunc(GL_ALPHA_BITS, &component);
  2497             bits += component;
  2498 
  2499             *value = bits;
  2500             return 0;
  2501         }
  2502     case SDL_GL_ACCELERATED_VISUAL:
  2503         {
  2504             /* FIXME: How do we get this information? */
  2505             *value = (_this->gl_config.accelerated != 0);
  2506             return 0;
  2507         }
  2508     default:
  2509         SDL_SetError("Unknown OpenGL attribute");
  2510         return -1;
  2511     }
  2512 
  2513     glGetIntegervFunc(attrib, (GLint *) value);
  2514     return 0;
  2515 #else
  2516     SDL_Unsupported();
  2517     return -1;
  2518 #endif /* SDL_VIDEO_OPENGL */
  2519 }
  2520 
  2521 SDL_GLContext
  2522 SDL_GL_CreateContext(SDL_WindowID windowID)
  2523 {
  2524     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2525 
  2526     if (!window) {
  2527         return NULL;
  2528     }
  2529     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2530         SDL_SetError("The specified window isn't an OpenGL window");
  2531         return NULL;
  2532     }
  2533     return _this->GL_CreateContext(_this, window);
  2534 }
  2535 
  2536 int
  2537 SDL_GL_MakeCurrent(SDL_WindowID windowID, SDL_GLContext context)
  2538 {
  2539     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2540 
  2541     if (window && !(window->flags & SDL_WINDOW_OPENGL)) {
  2542         SDL_SetError("The specified window isn't an OpenGL window");
  2543         return -1;
  2544     }
  2545     if (!context) {
  2546         window = NULL;
  2547     }
  2548     return _this->GL_MakeCurrent(_this, window, context);
  2549 }
  2550 
  2551 int
  2552 SDL_GL_SetSwapInterval(int interval)
  2553 {
  2554     if (!_this) {
  2555         SDL_UninitializedVideo();
  2556         return -1;
  2557     }
  2558 
  2559     if (_this->GL_SetSwapInterval) {
  2560         return _this->GL_SetSwapInterval(_this, interval);
  2561     } else {
  2562         SDL_SetError("Setting the swap interval is not supported");
  2563         return -1;
  2564     }
  2565 }
  2566 
  2567 int
  2568 SDL_GL_GetSwapInterval(void)
  2569 {
  2570     if (!_this) {
  2571         SDL_UninitializedVideo();
  2572         return -1;
  2573     }
  2574 
  2575     if (_this->GL_GetSwapInterval) {
  2576         return _this->GL_GetSwapInterval(_this);
  2577     } else {
  2578         SDL_SetError("Getting the swap interval is not supported");
  2579         return -1;
  2580     }
  2581 }
  2582 
  2583 void
  2584 SDL_GL_SwapWindow(SDL_WindowID windowID)
  2585 {
  2586     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2587 
  2588     if (!window) {
  2589         return;
  2590     }
  2591     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2592         SDL_SetError("The specified window isn't an OpenGL window");
  2593         return;
  2594     }
  2595     _this->GL_SwapWindow(_this, window);
  2596 }
  2597 
  2598 void
  2599 SDL_GL_DeleteContext(SDL_GLContext context)
  2600 {
  2601     if (!_this || !context) {
  2602         return;
  2603     }
  2604     _this->GL_MakeCurrent(_this, NULL, NULL);
  2605     _this->GL_DeleteContext(_this, context);
  2606 }
  2607 
  2608 #if 0                           // FIXME
  2609 /* Utility function used by SDL_WM_SetIcon();
  2610  * flags & 1 for color key, flags & 2 for alpha channel. */
  2611 static void
  2612 CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
  2613 {
  2614     int x, y;
  2615     Uint32 colorkey;
  2616 #define SET_MASKBIT(icon, x, y, mask) \
  2617 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  2618 
  2619     colorkey = icon->format->colorkey;
  2620     switch (icon->format->BytesPerPixel) {
  2621     case 1:
  2622         {
  2623             Uint8 *pixels;
  2624             for (y = 0; y < icon->h; ++y) {
  2625                 pixels = (Uint8 *) icon->pixels + y * icon->pitch;
  2626                 for (x = 0; x < icon->w; ++x) {
  2627                     if (*pixels++ == colorkey) {
  2628                         SET_MASKBIT(icon, x, y, mask);
  2629                     }
  2630                 }
  2631             }
  2632         }
  2633         break;
  2634 
  2635     case 2:
  2636         {
  2637             Uint16 *pixels;
  2638             for (y = 0; y < icon->h; ++y) {
  2639                 pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
  2640                 for (x = 0; x < icon->w; ++x) {
  2641                     if ((flags & 1) && *pixels == colorkey) {
  2642                         SET_MASKBIT(icon, x, y, mask);
  2643                     } else if ((flags & 2)
  2644                                && (*pixels & icon->format->Amask) == 0) {
  2645                         SET_MASKBIT(icon, x, y, mask);
  2646                     }
  2647                     pixels++;
  2648                 }
  2649             }
  2650         }
  2651         break;
  2652 
  2653     case 4:
  2654         {
  2655             Uint32 *pixels;
  2656             for (y = 0; y < icon->h; ++y) {
  2657                 pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
  2658                 for (x = 0; x < icon->w; ++x) {
  2659                     if ((flags & 1) && *pixels == colorkey) {
  2660                         SET_MASKBIT(icon, x, y, mask);
  2661                     } else if ((flags & 2)
  2662                                && (*pixels & icon->format->Amask) == 0) {
  2663                         SET_MASKBIT(icon, x, y, mask);
  2664                     }
  2665                     pixels++;
  2666                 }
  2667             }
  2668         }
  2669         break;
  2670     }
  2671 }
  2672 
  2673 /*
  2674  * Sets the window manager icon for the display window.
  2675  */
  2676 void
  2677 SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
  2678 {
  2679     if (icon && _this->SetIcon) {
  2680         /* Generate a mask if necessary, and create the icon! */
  2681         if (mask == NULL) {
  2682             int mask_len = icon->h * (icon->w + 7) / 8;
  2683             int flags = 0;
  2684             mask = (Uint8 *) SDL_malloc(mask_len);
  2685             if (mask == NULL) {
  2686                 return;
  2687             }
  2688             SDL_memset(mask, ~0, mask_len);
  2689             if (icon->flags & SDL_SRCCOLORKEY)
  2690                 flags |= 1;
  2691             if (icon->flags & SDL_SRCALPHA)
  2692                 flags |= 2;
  2693             if (flags) {
  2694                 CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  2695             }
  2696             _this->SetIcon(_this, icon, mask);
  2697             SDL_free(mask);
  2698         } else {
  2699             _this->SetIcon(_this, icon, mask);
  2700         }
  2701     }
  2702 }
  2703 #endif
  2704 
  2705 SDL_bool
  2706 SDL_GetWindowWMInfo(SDL_WindowID windowID, struct SDL_SysWMinfo *info)
  2707 {
  2708     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2709 
  2710     if (!window || !_this->GetWindowWMInfo) {
  2711         return SDL_FALSE;
  2712     }
  2713     return (_this->GetWindowWMInfo(_this, window, info));
  2714 }
  2715 
  2716 /* vi: set ts=4 sw=4 expandtab: */