src/video/SDL_video.c
author Jiang Jiang <gzjjgod@gmail.com>
Thu, 06 Aug 2009 08:56:48 +0000
branchgsoc2009_IME
changeset 3135 f4e553ec6a62
parent 3130 fef1a835af43
child 3136 962357f325e1
permissions -rw-r--r--
Update API, first step: make it build
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2009 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 #include "SDL_config.h"
    23 
    24 /* The high-level video driver subsystem */
    25 
    26 #include "SDL.h"
    27 #include "SDL_video.h"
    28 #include "SDL_sysvideo.h"
    29 #include "SDL_blit.h"
    30 #include "SDL_pixels_c.h"
    31 #include "SDL_renderer_gl.h"
    32 #include "SDL_renderer_gles.h"
    33 #include "SDL_renderer_sw.h"
    34 #include "../events/SDL_sysevents.h"
    35 #include "../events/SDL_events_c.h"
    36 
    37 #if SDL_VIDEO_OPENGL_ES
    38 #include "SDL_opengles.h"
    39 #endif /* SDL_VIDEO_OPENGL_ES */
    40 
    41 #if SDL_VIDEO_OPENGL
    42 #include "SDL_opengl.h"
    43 
    44 /* On Windows, windows.h defines CreateWindow */
    45 #ifdef CreateWindow
    46 #undef CreateWindow
    47 #endif
    48 #endif /* SDL_VIDEO_OPENGL */
    49 
    50 /* Available video drivers */
    51 static VideoBootStrap *bootstrap[] = {
    52 #if SDL_VIDEO_DRIVER_COCOA
    53     &COCOA_bootstrap,
    54 #endif
    55 #if SDL_VIDEO_DRIVER_X11
    56     &X11_bootstrap,
    57 #endif
    58 #if SDL_VIDEO_DRIVER_NANOX
    59     &NX_bootstrap,
    60 #endif
    61 #if SDL_VIDEO_DRIVER_IPOD
    62     &iPod_bootstrap,
    63 #endif
    64 #if SDL_VIDEO_DRIVER_WSCONS
    65     &WSCONS_bootstrap,
    66 #endif
    67 #if SDL_VIDEO_DRIVER_FBCON
    68     &FBCON_bootstrap,
    69 #endif
    70 #if SDL_VIDEO_DRIVER_DIRECTFB
    71     &DirectFB_bootstrap,
    72 #endif
    73 #if SDL_VIDEO_DRIVER_PS2GS
    74     &PS2GS_bootstrap,
    75 #endif
    76 #if SDL_VIDEO_DRIVER_VGL
    77     &VGL_bootstrap,
    78 #endif
    79 #if SDL_VIDEO_DRIVER_SVGALIB
    80     &SVGALIB_bootstrap,
    81 #endif
    82 #if SDL_VIDEO_DRIVER_GAPI
    83     &GAPI_bootstrap,
    84 #endif
    85 #if SDL_VIDEO_DRIVER_WIN32
    86     &WIN32_bootstrap,
    87 #endif
    88 #if SDL_VIDEO_DRIVER_BWINDOW
    89     &BWINDOW_bootstrap,
    90 #endif
    91 #if SDL_VIDEO_DRIVER_PHOTON
    92     &photon_bootstrap,
    93 #endif
    94 #if SDL_VIDEO_DRIVER_QNXGF
    95     &qnxgf_bootstrap,
    96 #endif
    97 #if SDL_VIDEO_DRIVER_EPOC
    98     &EPOC_bootstrap,
    99 #endif
   100 #if SDL_VIDEO_DRIVER_XBIOS
   101     &XBIOS_bootstrap,
   102 #endif
   103 #if SDL_VIDEO_DRIVER_GEM
   104     &GEM_bootstrap,
   105 #endif
   106 #if SDL_VIDEO_DRIVER_DC
   107     &DC_bootstrap,
   108 #endif
   109 #if SDL_VIDEO_DRIVER_RISCOS
   110     &RISCOS_bootstrap,
   111 #endif
   112 #if SDL_VIDEO_DRIVER_OS2FS
   113     &OS2FSLib_bootstrap,
   114 #endif
   115 #if SDL_VIDEO_DRIVER_NDS
   116     &NDS_bootstrap,
   117 #endif
   118 #if SDL_VIDEO_DRIVER_UIKIT
   119     &UIKIT_bootstrap,
   120 #endif
   121 #if SDL_VIDEO_DRIVER_DUMMY
   122     &DUMMY_bootstrap,
   123 #endif
   124     NULL
   125 };
   126 
   127 static SDL_VideoDevice *_this = NULL;
   128 
   129 /* Various local functions */
   130 static void SDL_UpdateWindowGrab(SDL_Window * window);
   131 
   132 static int
   133 cmpmodes(const void *A, const void *B)
   134 {
   135     SDL_DisplayMode a = *(const SDL_DisplayMode *) A;
   136     SDL_DisplayMode b = *(const SDL_DisplayMode *) B;
   137 
   138     if (a.w != b.w) {
   139         return b.w - a.w;
   140     }
   141     if (a.h != b.h) {
   142         return b.h - a.h;
   143     }
   144     if (SDL_BITSPERPIXEL(a.format) != SDL_BITSPERPIXEL(b.format)) {
   145         return SDL_BITSPERPIXEL(b.format) - SDL_BITSPERPIXEL(a.format);
   146     }
   147     if (a.refresh_rate != b.refresh_rate) {
   148         return b.refresh_rate - a.refresh_rate;
   149     }
   150     return 0;
   151 }
   152 
   153 static void
   154 SDL_UninitializedVideo()
   155 {
   156     SDL_SetError("Video subsystem has not been initialized");
   157 }
   158 
   159 int
   160 SDL_GetNumVideoDrivers(void)
   161 {
   162     return SDL_arraysize(bootstrap) - 1;
   163 }
   164 
   165 const char *
   166 SDL_GetVideoDriver(int index)
   167 {
   168     if (index >= 0 && index < SDL_GetNumVideoDrivers()) {
   169         return bootstrap[index]->name;
   170     }
   171     return NULL;
   172 }
   173 
   174 /*
   175  * Initialize the video and event subsystems -- determine native pixel format
   176  */
   177 int
   178 SDL_VideoInit(const char *driver_name, Uint32 flags)
   179 {
   180     SDL_VideoDevice *video;
   181     int index;
   182     int i;
   183 
   184     /* Toggle the event thread flags, based on OS requirements */
   185 #if defined(MUST_THREAD_EVENTS)
   186     flags |= SDL_INIT_EVENTTHREAD;
   187 #elif defined(CANT_THREAD_EVENTS)
   188     if ((flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD) {
   189         SDL_SetError("OS doesn't support threaded events");
   190         return -1;
   191     }
   192 #endif
   193 
   194     /* Start the event loop */
   195     if (SDL_StartEventLoop(flags) < 0) {
   196         return -1;
   197     }
   198     /* Check to make sure we don't overwrite '_this' */
   199     if (_this != NULL) {
   200         SDL_VideoQuit();
   201     }
   202     /* Select the proper video driver */
   203     index = 0;
   204     video = NULL;
   205     if (driver_name == NULL) {
   206         driver_name = SDL_getenv("SDL_VIDEODRIVER");
   207     }
   208     if (driver_name != NULL) {
   209         for (i = 0; bootstrap[i]; ++i) {
   210             if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) {
   211                 if (bootstrap[i]->available()) {
   212                     video = bootstrap[i]->create(index);
   213                 }
   214                 break;
   215             }
   216         }
   217     } else {
   218         for (i = 0; bootstrap[i]; ++i) {
   219             if (bootstrap[i]->available()) {
   220                 video = bootstrap[i]->create(index);
   221                 if (video != NULL) {
   222                     break;
   223                 }
   224             }
   225         }
   226     }
   227     if (video == NULL) {
   228         if (driver_name) {
   229             SDL_SetError("%s not available", driver_name);
   230         } else {
   231             SDL_SetError("No available video device");
   232         }
   233         return -1;
   234     }
   235     _this = video;
   236     _this->name = bootstrap[i]->name;
   237     _this->next_object_id = 1;
   238 
   239 
   240     /* Set some very sane GL defaults */
   241     _this->gl_config.driver_loaded = 0;
   242     _this->gl_config.dll_handle = NULL;
   243     _this->gl_config.red_size = 3;
   244     _this->gl_config.green_size = 3;
   245     _this->gl_config.blue_size = 2;
   246     _this->gl_config.alpha_size = 0;
   247     _this->gl_config.buffer_size = 0;
   248     _this->gl_config.depth_size = 16;
   249     _this->gl_config.stencil_size = 0;
   250     _this->gl_config.double_buffer = 1;
   251     _this->gl_config.accum_red_size = 0;
   252     _this->gl_config.accum_green_size = 0;
   253     _this->gl_config.accum_blue_size = 0;
   254     _this->gl_config.accum_alpha_size = 0;
   255     _this->gl_config.stereo = 0;
   256     _this->gl_config.multisamplebuffers = 0;
   257     _this->gl_config.multisamplesamples = 0;
   258     _this->gl_config.retained_backing = 1;
   259     _this->gl_config.accelerated = -1;  /* not known, don't set */
   260     _this->gl_config.major_version = 2;
   261     _this->gl_config.minor_version = 1;
   262 
   263     /* Initialize the video subsystem */
   264     if (_this->VideoInit(_this) < 0) {
   265         SDL_VideoQuit();
   266         return -1;
   267     }
   268     /* Make sure some displays were added */
   269     if (_this->num_displays == 0) {
   270         SDL_SetError("The video driver did not add any displays");
   271         SDL_VideoQuit();
   272         return (-1);
   273     }
   274     /* The software renderer is always available */
   275     for (i = 0; i < _this->num_displays; ++i) {
   276 #if SDL_VIDEO_RENDER_OGL
   277         SDL_AddRenderDriver(i, &GL_RenderDriver);
   278 #endif
   279 
   280 #if SDL_VIDEO_RENDER_OGL_ES
   281         SDL_AddRenderDriver(i, &GL_ES_RenderDriver);
   282 #endif
   283         if (_this->displays[i].num_render_drivers > 0) {
   284             SDL_AddRenderDriver(i, &SW_RenderDriver);
   285         }
   286     }
   287 
   288     /* We're ready to go! */
   289     return 0;
   290 }
   291 
   292 const char *
   293 SDL_GetCurrentVideoDriver()
   294 {
   295     if (!_this) {
   296         SDL_UninitializedVideo();
   297         return NULL;
   298     }
   299     return _this->name;
   300 }
   301 
   302 SDL_VideoDevice *
   303 SDL_GetVideoDevice()
   304 {
   305     return _this;
   306 }
   307 
   308 int
   309 SDL_AddBasicVideoDisplay(const SDL_DisplayMode * desktop_mode)
   310 {
   311     SDL_VideoDisplay display;
   312 
   313     SDL_zero(display);
   314     if (desktop_mode) {
   315         display.desktop_mode = *desktop_mode;
   316     }
   317     display.current_mode = display.desktop_mode;
   318 
   319     return SDL_AddVideoDisplay(&display);
   320 }
   321 
   322 int
   323 SDL_AddVideoDisplay(const SDL_VideoDisplay * display)
   324 {
   325     SDL_VideoDisplay *displays;
   326     int index = -1;
   327 
   328     displays =
   329         SDL_realloc(_this->displays,
   330                     (_this->num_displays + 1) * sizeof(*displays));
   331     if (displays) {
   332         index = _this->num_displays++;
   333         displays[index] = *display;
   334         displays[index].device = _this;
   335         _this->displays = displays;
   336     } else {
   337         SDL_OutOfMemory();
   338     }
   339     return index;
   340 }
   341 
   342 int
   343 SDL_GetNumVideoDisplays(void)
   344 {
   345     if (!_this) {
   346         SDL_UninitializedVideo();
   347         return 0;
   348     }
   349     return _this->num_displays;
   350 }
   351 
   352 int
   353 SDL_SelectVideoDisplay(int index)
   354 {
   355     if (!_this) {
   356         SDL_UninitializedVideo();
   357         return (-1);
   358     }
   359     if (index < 0 || index >= _this->num_displays) {
   360         SDL_SetError("index must be in the range 0 - %d",
   361                      _this->num_displays - 1);
   362         return -1;
   363     }
   364     _this->current_display = index;
   365     return 0;
   366 }
   367 
   368 int
   369 SDL_GetCurrentVideoDisplay(void)
   370 {
   371     if (!_this) {
   372         SDL_UninitializedVideo();
   373         return (-1);
   374     }
   375     return _this->current_display;
   376 }
   377 
   378 SDL_bool
   379 SDL_AddDisplayMode(int displayIndex, const SDL_DisplayMode * mode)
   380 {
   381     SDL_VideoDisplay *display = &_this->displays[displayIndex];
   382     SDL_DisplayMode *modes;
   383     int i, nmodes;
   384 
   385     /* Make sure we don't already have the mode in the list */
   386     modes = display->display_modes;
   387     nmodes = display->num_display_modes;
   388     for (i = nmodes; i--;) {
   389         if (SDL_memcmp(mode, &modes[i], sizeof(*mode)) == 0) {
   390             return SDL_FALSE;
   391         }
   392     }
   393 
   394     /* Go ahead and add the new mode */
   395     if (nmodes == display->max_display_modes) {
   396         modes =
   397             SDL_realloc(modes,
   398                         (display->max_display_modes + 32) * sizeof(*modes));
   399         if (!modes) {
   400             return SDL_FALSE;
   401         }
   402         display->display_modes = modes;
   403         display->max_display_modes += 32;
   404     }
   405     modes[nmodes] = *mode;
   406     display->num_display_modes++;
   407 
   408     return SDL_TRUE;
   409 }
   410 
   411 int
   412 SDL_GetNumDisplayModes()
   413 {
   414     if (_this) {
   415         SDL_VideoDisplay *display = &SDL_CurrentDisplay;
   416         if (!display->num_display_modes && _this->GetDisplayModes) {
   417             _this->GetDisplayModes(_this);
   418             SDL_qsort(display->display_modes, display->num_display_modes,
   419                       sizeof(SDL_DisplayMode), cmpmodes);
   420         }
   421         return display->num_display_modes;
   422     }
   423     return 0;
   424 }
   425 
   426 int
   427 SDL_GetDisplayMode(int index, SDL_DisplayMode * mode)
   428 {
   429     if (index < 0 || index >= SDL_GetNumDisplayModes()) {
   430         SDL_SetError("index must be in the range of 0 - %d",
   431                      SDL_GetNumDisplayModes() - 1);
   432         return -1;
   433     }
   434     if (mode) {
   435         *mode = SDL_CurrentDisplay.display_modes[index];
   436     }
   437     return 0;
   438 }
   439 
   440 int
   441 SDL_GetDesktopDisplayMode(SDL_DisplayMode * mode)
   442 {
   443     if (!_this) {
   444         SDL_UninitializedVideo();
   445         return -1;
   446     }
   447     if (mode) {
   448         *mode = SDL_CurrentDisplay.desktop_mode;
   449     }
   450     return 0;
   451 }
   452 
   453 int
   454 SDL_GetCurrentDisplayMode(SDL_DisplayMode * mode)
   455 {
   456     if (!_this) {
   457         SDL_UninitializedVideo();
   458         return -1;
   459     }
   460     if (mode) {
   461         *mode = SDL_CurrentDisplay.current_mode;
   462     }
   463     return 0;
   464 }
   465 
   466 SDL_DisplayMode *
   467 SDL_GetClosestDisplayMode(const SDL_DisplayMode * mode,
   468                           SDL_DisplayMode * closest)
   469 {
   470     Uint32 target_format;
   471     int target_refresh_rate;
   472     int i;
   473     SDL_DisplayMode *current, *match;
   474 
   475     if (!_this || !mode || !closest) {
   476         return NULL;
   477     }
   478     /* Default to the desktop format */
   479     if (mode->format) {
   480         target_format = mode->format;
   481     } else {
   482         target_format = SDL_CurrentDisplay.desktop_mode.format;
   483     }
   484 
   485     /* Default to the desktop refresh rate */
   486     if (mode->refresh_rate) {
   487         target_refresh_rate = mode->refresh_rate;
   488     } else {
   489         target_refresh_rate = SDL_CurrentDisplay.desktop_mode.refresh_rate;
   490     }
   491 
   492     match = NULL;
   493     for (i = 0; i < SDL_GetNumDisplayModes(); ++i) {
   494         current = &SDL_CurrentDisplay.display_modes[i];
   495 
   496         if (current->w && (current->w < mode->w)) {
   497             /* Out of sorted modes large enough here */
   498             break;
   499         }
   500         if (current->h && (current->h < mode->h)) {
   501             if (current->w && (current->w == mode->w)) {
   502                 /* Out of sorted modes large enough here */
   503                 break;
   504             }
   505             /* Wider, but not tall enough, due to a different
   506                aspect ratio. This mode must be skipped, but closer
   507                modes may still follow. */
   508             continue;
   509         }
   510         if (!match || current->w < match->w || current->h < match->h) {
   511             match = current;
   512             continue;
   513         }
   514         if (current->format != match->format) {
   515             /* Sorted highest depth to lowest */
   516             if (current->format == target_format ||
   517                 (SDL_BITSPERPIXEL(current->format) >=
   518                  SDL_BITSPERPIXEL(target_format)
   519                  && SDL_PIXELTYPE(current->format) ==
   520                  SDL_PIXELTYPE(target_format))) {
   521                 match = current;
   522             }
   523             continue;
   524         }
   525         if (current->refresh_rate != match->refresh_rate) {
   526             /* Sorted highest refresh to lowest */
   527             if (current->refresh_rate >= target_refresh_rate) {
   528                 match = current;
   529             }
   530         }
   531     }
   532     if (match) {
   533         if (match->format) {
   534             closest->format = match->format;
   535         } else {
   536             closest->format = mode->format;
   537         }
   538         if (match->w && match->h) {
   539             closest->w = match->w;
   540             closest->h = match->h;
   541         } else {
   542             closest->w = mode->w;
   543             closest->h = mode->h;
   544         }
   545         if (match->refresh_rate) {
   546             closest->refresh_rate = match->refresh_rate;
   547         } else {
   548             closest->refresh_rate = mode->refresh_rate;
   549         }
   550         closest->driverdata = match->driverdata;
   551 
   552         /*
   553          * Pick some reasonable defaults if the app and driver don't
   554          * care
   555          */
   556         if (!closest->format) {
   557             closest->format = SDL_PIXELFORMAT_RGB888;
   558         }
   559         if (!closest->w) {
   560             closest->w = 640;
   561         }
   562         if (!closest->h) {
   563             closest->h = 480;
   564         }
   565         return closest;
   566     }
   567     return NULL;
   568 }
   569 
   570 int
   571 SDL_SetDisplayMode(const SDL_DisplayMode * mode)
   572 {
   573     SDL_VideoDisplay *display;
   574     SDL_DisplayMode display_mode;
   575     SDL_DisplayMode current_mode;
   576     int i, ncolors;
   577 
   578     if (!_this) {
   579         SDL_UninitializedVideo();
   580         return -1;
   581     }
   582     display = &SDL_CurrentDisplay;
   583     if (!mode) {
   584         mode = &display->desktop_mode;
   585     }
   586     display_mode = *mode;
   587 
   588     /* Default to the current mode */
   589     if (!display_mode.format) {
   590         display_mode.format = display->current_mode.format;
   591     }
   592     if (!display_mode.w) {
   593         display_mode.w = display->current_mode.w;
   594     }
   595     if (!display_mode.h) {
   596         display_mode.h = display->current_mode.h;
   597     }
   598     if (!display_mode.refresh_rate) {
   599         display_mode.refresh_rate = display->current_mode.refresh_rate;
   600     }
   601     /* Get a good video mode, the closest one possible */
   602     if (!SDL_GetClosestDisplayMode(&display_mode, &display_mode)) {
   603         SDL_SetError("No video mode large enough for %dx%d",
   604                      display_mode.w, display_mode.h);
   605         return -1;
   606     }
   607     /* See if there's anything left to do */
   608     SDL_GetCurrentDisplayMode(&current_mode);
   609     if (SDL_memcmp(&display_mode, &current_mode, sizeof(display_mode)) == 0) {
   610         return 0;
   611     }
   612     /* Actually change the display mode */
   613     if (_this->SetDisplayMode(_this, &display_mode) < 0) {
   614         return -1;
   615     }
   616     display->current_mode = display_mode;
   617 
   618     /* Set up a palette, if necessary */
   619     if (SDL_ISPIXELFORMAT_INDEXED(display_mode.format)) {
   620         ncolors = (1 << SDL_BITSPERPIXEL(display_mode.format));
   621     } else {
   622         ncolors = 0;
   623     }
   624     if ((!ncolors && display->palette) || (ncolors && !display->palette)
   625         || (ncolors && ncolors != display->palette->ncolors)) {
   626         if (display->palette) {
   627             SDL_FreePalette(display->palette);
   628             display->palette = NULL;
   629         }
   630         if (ncolors) {
   631             display->palette = SDL_AllocPalette(ncolors);
   632             if (!display->palette) {
   633                 return -1;
   634             }
   635             SDL_DitherColors(display->palette->colors,
   636                              SDL_BITSPERPIXEL(display_mode.format));
   637         }
   638     }
   639     /* Move any fullscreen windows into position */
   640     for (i = 0; i < display->num_windows; ++i) {
   641         SDL_Window *window = &display->windows[i];
   642         if (FULLSCREEN_VISIBLE(window)) {
   643             SDL_SetWindowPosition(window->id, window->x, window->y);
   644         }
   645     }
   646 
   647     return 0;
   648 }
   649 
   650 int
   651 SDL_SetFullscreenDisplayMode(const SDL_DisplayMode * mode)
   652 {
   653     SDL_VideoDisplay *display;
   654     SDL_DisplayMode fullscreen_mode;
   655     int i;
   656 
   657     if (!_this) {
   658         SDL_UninitializedVideo();
   659         return -1;
   660     }
   661     display = &SDL_CurrentDisplay;
   662     if (!mode) {
   663         mode = &display->desktop_mode;
   664     }
   665     if (!SDL_GetClosestDisplayMode(mode, &fullscreen_mode)) {
   666         SDL_SetError("Couldn't find display mode match");
   667         return -1;
   668     }
   669 
   670     if (SDL_memcmp
   671         (&fullscreen_mode, &display->fullscreen_mode,
   672          sizeof(fullscreen_mode)) == 0) {
   673         /* Nothing to do... */
   674         return 0;
   675     }
   676     display->fullscreen_mode = fullscreen_mode;
   677 
   678     /* Actually set the mode if we have a fullscreen window visible */
   679     for (i = 0; i < display->num_windows; ++i) {
   680         SDL_Window *window = &display->windows[i];
   681         if (FULLSCREEN_VISIBLE(window)) {
   682             if (SDL_SetDisplayMode(&display->fullscreen_mode) < 0) {
   683                 return -1;
   684             }
   685         }
   686         if (window->flags & SDL_WINDOW_FULLSCREEN) {
   687             SDL_OnWindowResized(window);
   688         }
   689     }
   690     return 0;
   691 }
   692 
   693 int
   694 SDL_GetFullscreenDisplayMode(SDL_DisplayMode * mode)
   695 {
   696     if (!_this) {
   697         SDL_UninitializedVideo();
   698         return -1;
   699     }
   700     if (mode) {
   701         *mode = SDL_CurrentDisplay.fullscreen_mode;
   702     }
   703     return 0;
   704 }
   705 
   706 int
   707 SDL_SetDisplayPalette(const SDL_Color * colors, int firstcolor, int ncolors)
   708 {
   709     SDL_Palette *palette;
   710     int status = 0;
   711 
   712     if (!_this) {
   713         SDL_UninitializedVideo();
   714         return -1;
   715     }
   716     palette = SDL_CurrentDisplay.palette;
   717     if (!palette) {
   718         SDL_SetError("Display mode does not have a palette");
   719         return -1;
   720     }
   721     status = SDL_SetPaletteColors(palette, colors, firstcolor, ncolors);
   722 
   723     if (_this->SetDisplayPalette) {
   724         if (_this->SetDisplayPalette(_this, palette) < 0) {
   725             status = -1;
   726         }
   727     }
   728     return status;
   729 }
   730 
   731 int
   732 SDL_GetDisplayPalette(SDL_Color * colors, int firstcolor, int ncolors)
   733 {
   734     SDL_Palette *palette;
   735 
   736     if (!_this) {
   737         SDL_UninitializedVideo();
   738         return -1;
   739     }
   740     palette = SDL_CurrentDisplay.palette;
   741     if (!palette->ncolors) {
   742         SDL_SetError("Display mode does not have a palette");
   743         return -1;
   744     }
   745     if (firstcolor < 0 || (firstcolor + ncolors) > palette->ncolors) {
   746         SDL_SetError("Palette indices are out of range");
   747         return -1;
   748     }
   749     SDL_memcpy(colors, &palette->colors[firstcolor],
   750                ncolors * sizeof(*colors));
   751     return 0;
   752 }
   753 
   754 SDL_WindowID
   755 SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
   756 {
   757     const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
   758                                   SDL_WINDOW_OPENGL |
   759                                   SDL_WINDOW_BORDERLESS |
   760                                   SDL_WINDOW_RESIZABLE |
   761                                   SDL_WINDOW_INPUT_GRABBED);
   762     SDL_VideoDisplay *display;
   763     SDL_Window window;
   764     int num_windows;
   765     SDL_Window *windows;
   766 
   767     if (!_this) {
   768         SDL_UninitializedVideo();
   769         return 0;
   770     }
   771     if (flags & SDL_WINDOW_OPENGL) {
   772         if (!_this->GL_CreateContext) {
   773             SDL_SetError("No OpenGL support in video driver");
   774             return 0;
   775         }
   776         SDL_GL_LoadLibrary(NULL);
   777     }
   778     SDL_zero(window);
   779     window.id = _this->next_object_id++;
   780     window.x = x;
   781     window.y = y;
   782     window.w = w;
   783     window.h = h;
   784     window.flags = (flags & allowed_flags);
   785     window.display = _this->current_display;
   786 
   787     if (_this->CreateWindow && _this->CreateWindow(_this, &window) < 0) {
   788         if (flags & SDL_WINDOW_OPENGL) {
   789             SDL_GL_UnloadLibrary();
   790         }
   791         return 0;
   792     }
   793     display = &SDL_CurrentDisplay;
   794     num_windows = display->num_windows;
   795     windows =
   796         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   797     if (!windows) {
   798         if (_this->DestroyWindow) {
   799             _this->DestroyWindow(_this, &window);
   800         }
   801         if (flags & SDL_WINDOW_OPENGL) {
   802             SDL_GL_UnloadLibrary();
   803         }
   804         return 0;
   805     }
   806     windows[num_windows] = window;
   807     display->windows = windows;
   808     display->num_windows++;
   809 
   810     if (title) {
   811         SDL_SetWindowTitle(window.id, title);
   812     }
   813     if (flags & SDL_WINDOW_MAXIMIZED) {
   814         SDL_MaximizeWindow(window.id);
   815     }
   816     if (flags & SDL_WINDOW_MINIMIZED) {
   817         SDL_MinimizeWindow(window.id);
   818     }
   819     if (flags & SDL_WINDOW_SHOWN) {
   820         SDL_ShowWindow(window.id);
   821     }
   822     SDL_UpdateWindowGrab(&window);
   823 
   824     return window.id;
   825 }
   826 
   827 SDL_WindowID
   828 SDL_CreateWindowFrom(const void *data)
   829 {
   830     SDL_VideoDisplay *display;
   831     SDL_Window window;
   832     int num_windows;
   833     SDL_Window *windows;
   834 
   835     if (!_this) {
   836         SDL_UninitializedVideo();
   837         return (0);
   838     }
   839     SDL_zero(window);
   840     window.id = _this->next_object_id++;
   841     window.display = _this->current_display;
   842     window.flags = SDL_WINDOW_FOREIGN;
   843 
   844     if (!_this->CreateWindowFrom ||
   845         _this->CreateWindowFrom(_this, &window, data) < 0) {
   846         return 0;
   847     }
   848     display = &SDL_CurrentDisplay;
   849     num_windows = display->num_windows;
   850     windows =
   851         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   852     if (!windows) {
   853         if (_this->DestroyWindow) {
   854             _this->DestroyWindow(_this, &window);
   855         }
   856         if (window.title) {
   857             SDL_free(window.title);
   858         }
   859         return 0;
   860     }
   861     windows[num_windows] = window;
   862     display->windows = windows;
   863     display->num_windows++;
   864 
   865     return window.id;
   866 }
   867 
   868 int
   869 SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
   870 {
   871     const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
   872                                   SDL_WINDOW_OPENGL |
   873                                   SDL_WINDOW_BORDERLESS |
   874                                   SDL_WINDOW_RESIZABLE |
   875                                   SDL_WINDOW_INPUT_GRABBED);
   876     char *title = window->title;
   877 
   878     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   879         SDL_SetError("No OpenGL support in video driver");
   880         return -1;
   881     }
   882     if ((window->flags & SDL_WINDOW_OPENGL) != (flags & SDL_WINDOW_OPENGL)) {
   883         if (flags & SDL_WINDOW_OPENGL) {
   884             SDL_GL_LoadLibrary(NULL);
   885         } else {
   886             SDL_GL_UnloadLibrary();
   887         }
   888     }
   889 
   890     if (window->flags & SDL_WINDOW_FOREIGN) {
   891         /* Can't destroy and re-create foreign windows, hrm */
   892         flags |= SDL_WINDOW_FOREIGN;
   893     } else {
   894         flags &= ~SDL_WINDOW_FOREIGN;
   895     }
   896 
   897     if (_this->DestroyWindow && !(flags & SDL_WINDOW_FOREIGN)) {
   898         _this->DestroyWindow(_this, window);
   899     }
   900 
   901     window->title = NULL;
   902     window->flags = (flags & allowed_flags);
   903 
   904     if (_this->CreateWindow && !(flags & SDL_WINDOW_FOREIGN)) {
   905         if (_this->CreateWindow(_this, window) < 0) {
   906             if (flags & SDL_WINDOW_OPENGL) {
   907                 SDL_GL_UnloadLibrary();
   908             }
   909             return -1;
   910         }
   911     }
   912 
   913     if (title) {
   914         SDL_SetWindowTitle(window->id, title);
   915         SDL_free(title);
   916     }
   917     if (flags & SDL_WINDOW_MAXIMIZED) {
   918         SDL_MaximizeWindow(window->id);
   919     }
   920     if (flags & SDL_WINDOW_MINIMIZED) {
   921         SDL_MinimizeWindow(window->id);
   922     }
   923     if (flags & SDL_WINDOW_SHOWN) {
   924         SDL_ShowWindow(window->id);
   925     }
   926     SDL_UpdateWindowGrab(window);
   927 
   928     return 0;
   929 }
   930 
   931 SDL_Window *
   932 SDL_GetWindowFromID(SDL_WindowID windowID)
   933 {
   934     int i, j;
   935 
   936     if (!_this) {
   937         SDL_UninitializedVideo();
   938         return NULL;
   939     }
   940     for (i = 0; i < _this->num_displays; ++i) {
   941         SDL_VideoDisplay *display = &_this->displays[i];
   942         for (j = 0; j < display->num_windows; ++j) {
   943             SDL_Window *window = &display->windows[j];
   944             if (window->id == windowID) {
   945                 return window;
   946             }
   947         }
   948     }
   949     return NULL;
   950 }
   951 
   952 SDL_VideoDisplay *
   953 SDL_GetDisplayFromWindow(SDL_Window * window)
   954 {
   955     if (!_this) {
   956         SDL_UninitializedVideo();
   957         return NULL;
   958     }
   959     if (!window) {
   960         return NULL;
   961     }
   962     return &_this->displays[window->display];
   963 }
   964 
   965 Uint32
   966 SDL_GetWindowFlags(SDL_WindowID windowID)
   967 {
   968     SDL_Window *window = SDL_GetWindowFromID(windowID);
   969 
   970     if (!window) {
   971         return 0;
   972     }
   973     return window->flags;
   974 }
   975 
   976 void
   977 SDL_SetWindowTitle(SDL_WindowID windowID, const char *title)
   978 {
   979     SDL_Window *window = SDL_GetWindowFromID(windowID);
   980 
   981     if (!window || title == window->title) {
   982         return;
   983     }
   984     if (window->title) {
   985         SDL_free(window->title);
   986     }
   987     if (title) {
   988         window->title = SDL_strdup(title);
   989     } else {
   990         window->title = NULL;
   991     }
   992 
   993     if (_this->SetWindowTitle) {
   994         _this->SetWindowTitle(_this, window);
   995     }
   996 }
   997 
   998 const char *
   999 SDL_GetWindowTitle(SDL_WindowID windowID)
  1000 {
  1001     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1002 
  1003     if (!window) {
  1004         return NULL;
  1005     }
  1006     return window->title;
  1007 }
  1008 
  1009 void
  1010 SDL_SetWindowIcon(SDL_WindowID windowID, SDL_Surface * icon)
  1011 {
  1012     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1013 
  1014     if (!window) {
  1015         return;
  1016     }
  1017     if (_this->SetWindowIcon) {
  1018         _this->SetWindowIcon(_this, window, icon);
  1019     }
  1020 }
  1021 
  1022 void
  1023 SDL_SetWindowData(SDL_WindowID windowID, void *userdata)
  1024 {
  1025     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1026 
  1027     if (!window) {
  1028         return;
  1029     }
  1030     window->userdata = userdata;
  1031 }
  1032 
  1033 void *
  1034 SDL_GetWindowData(SDL_WindowID windowID)
  1035 {
  1036     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1037 
  1038     if (!window) {
  1039         return NULL;
  1040     }
  1041     return window->userdata;
  1042 }
  1043 
  1044 void
  1045 SDL_SetWindowPosition(SDL_WindowID windowID, int x, int y)
  1046 {
  1047     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1048     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1049 
  1050     if (!window) {
  1051         return;
  1052     }
  1053     if (x != SDL_WINDOWPOS_UNDEFINED) {
  1054         window->x = x;
  1055     }
  1056     if (y != SDL_WINDOWPOS_UNDEFINED) {
  1057         window->y = y;
  1058     }
  1059     if (_this->SetWindowPosition) {
  1060         _this->SetWindowPosition(_this, window);
  1061     }
  1062     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MOVED, x, y);
  1063 }
  1064 
  1065 void
  1066 SDL_GetWindowPosition(SDL_WindowID windowID, int *x, int *y)
  1067 {
  1068     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1069 
  1070     if (!window) {
  1071         return;
  1072     }
  1073     if (x) {
  1074         *x = window->x;
  1075     }
  1076     if (y) {
  1077         *y = window->y;
  1078     }
  1079 }
  1080 
  1081 void
  1082 SDL_SetWindowSize(SDL_WindowID windowID, int w, int h)
  1083 {
  1084     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1085 
  1086     if (!window) {
  1087         return;
  1088     }
  1089     window->w = w;
  1090     window->h = h;
  1091 
  1092     if (_this->SetWindowSize) {
  1093         _this->SetWindowSize(_this, window);
  1094     }
  1095     SDL_OnWindowResized(window);
  1096 }
  1097 
  1098 void
  1099 SDL_GetWindowSize(SDL_WindowID windowID, int *w, int *h)
  1100 {
  1101     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1102 
  1103     if (window) {
  1104         if (w) {
  1105             *w = window->w;
  1106         }
  1107         if (h) {
  1108             *h = window->h;
  1109         }
  1110     } else {
  1111         if (w) {
  1112             *w = 0;
  1113         }
  1114         if (h) {
  1115             *h = 0;
  1116         }
  1117     }
  1118 }
  1119 
  1120 void
  1121 SDL_ShowWindow(SDL_WindowID windowID)
  1122 {
  1123     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1124 
  1125     if (!window || (window->flags & SDL_WINDOW_SHOWN)) {
  1126         return;
  1127     }
  1128 
  1129     if (_this->ShowWindow) {
  1130         _this->ShowWindow(_this, window);
  1131     }
  1132     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_SHOWN, 0, 0);
  1133 }
  1134 
  1135 void
  1136 SDL_HideWindow(SDL_WindowID windowID)
  1137 {
  1138     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1139 
  1140     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1141         return;
  1142     }
  1143 
  1144     if (_this->HideWindow) {
  1145         _this->HideWindow(_this, window);
  1146     }
  1147     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_HIDDEN, 0, 0);
  1148 }
  1149 
  1150 void
  1151 SDL_RaiseWindow(SDL_WindowID windowID)
  1152 {
  1153     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1154 
  1155     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1156         return;
  1157     }
  1158     if (_this->RaiseWindow) {
  1159         _this->RaiseWindow(_this, window);
  1160     }
  1161 }
  1162 
  1163 void
  1164 SDL_MaximizeWindow(SDL_WindowID windowID)
  1165 {
  1166     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1167 
  1168     if (!window || (window->flags & SDL_WINDOW_MAXIMIZED)) {
  1169         return;
  1170     }
  1171 
  1172     if (_this->MaximizeWindow) {
  1173         _this->MaximizeWindow(_this, window);
  1174     }
  1175     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MAXIMIZED, 0, 0);
  1176 }
  1177 
  1178 void
  1179 SDL_MinimizeWindow(SDL_WindowID windowID)
  1180 {
  1181     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1182 
  1183     if (!window || (window->flags & SDL_WINDOW_MINIMIZED)) {
  1184         return;
  1185     }
  1186 
  1187     if (_this->MinimizeWindow) {
  1188         _this->MinimizeWindow(_this, window);
  1189     }
  1190     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MINIMIZED, 0, 0);
  1191 }
  1192 
  1193 void
  1194 SDL_RestoreWindow(SDL_WindowID windowID)
  1195 {
  1196     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1197 
  1198     if (!window
  1199         || !(window->flags & (SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED))) {
  1200         return;
  1201     }
  1202 
  1203     if (_this->RestoreWindow) {
  1204         _this->RestoreWindow(_this, window);
  1205     }
  1206     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_RESTORED, 0, 0);
  1207 }
  1208 
  1209 int
  1210 SDL_SetWindowFullscreen(SDL_WindowID windowID, int fullscreen)
  1211 {
  1212     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1213 
  1214     if (!window) {
  1215         return -1;
  1216     }
  1217     if (fullscreen) {
  1218         fullscreen = SDL_WINDOW_FULLSCREEN;
  1219     }
  1220     if ((window->flags & SDL_WINDOW_FULLSCREEN) == fullscreen) {
  1221         return 0;
  1222     }
  1223     if (fullscreen) {
  1224         window->flags |= SDL_WINDOW_FULLSCREEN;
  1225 
  1226         if (FULLSCREEN_VISIBLE(window)) {
  1227             SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1228 
  1229             /* Hide any other fullscreen windows */
  1230             int i;
  1231             for (i = 0; i < display->num_windows; ++i) {
  1232                 SDL_Window *other = &display->windows[i];
  1233                 if (other->id != windowID && FULLSCREEN_VISIBLE(other)) {
  1234                     SDL_MinimizeWindow(other->id);
  1235                 }
  1236             }
  1237 
  1238             SDL_SetDisplayMode(&display->fullscreen_mode);
  1239         }
  1240     } else {
  1241         window->flags &= ~SDL_WINDOW_FULLSCREEN;
  1242 
  1243         if (FULLSCREEN_VISIBLE(window)) {
  1244             SDL_SetDisplayMode(NULL);
  1245         }
  1246     }
  1247     return 0;
  1248 }
  1249 
  1250 void
  1251 SDL_SetWindowGrab(SDL_WindowID windowID, int mode)
  1252 {
  1253     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1254 
  1255     if (!window || (!!mode == !!(window->flags & SDL_WINDOW_INPUT_GRABBED))) {
  1256         return;
  1257     }
  1258     if (mode) {
  1259         window->flags |= SDL_WINDOW_INPUT_GRABBED;
  1260     } else {
  1261         window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
  1262     }
  1263     SDL_UpdateWindowGrab(window);
  1264 }
  1265 
  1266 static void
  1267 SDL_UpdateWindowGrab(SDL_Window * window)
  1268 {
  1269     if ((window->flags & SDL_WINDOW_INPUT_FOCUS) && _this->SetWindowGrab) {
  1270         _this->SetWindowGrab(_this, window);
  1271     }
  1272 }
  1273 
  1274 int
  1275 SDL_GetWindowGrab(SDL_WindowID windowID)
  1276 {
  1277     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1278 
  1279     if (!window) {
  1280         return 0;
  1281     }
  1282     return ((window->flags & SDL_WINDOW_INPUT_GRABBED) != 0);
  1283 }
  1284 
  1285 void
  1286 SDL_OnWindowShown(SDL_Window * window)
  1287 {
  1288     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1289         SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_FOCUS_GAINED, 0, 0);
  1290     }
  1291 }
  1292 
  1293 void
  1294 SDL_OnWindowHidden(SDL_Window * window)
  1295 {
  1296     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1297         SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
  1298     }
  1299 }
  1300 
  1301 void
  1302 SDL_OnWindowResized(SDL_Window * window)
  1303 {
  1304     SDL_Renderer *renderer = window->renderer;
  1305 
  1306     if (renderer && renderer->DisplayModeChanged) {
  1307         renderer->DisplayModeChanged(renderer);
  1308     }
  1309 }
  1310 
  1311 void
  1312 SDL_OnWindowFocusGained(SDL_Window * window)
  1313 {
  1314     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1315 
  1316     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1317         SDL_SetDisplayMode(&display->fullscreen_mode);
  1318     }
  1319     if (display->gamma && _this->SetDisplayGammaRamp) {
  1320         _this->SetDisplayGammaRamp(_this, display->gamma);
  1321     }
  1322     if ((window->flags & (SDL_WINDOW_INPUT_GRABBED | SDL_WINDOW_FULLSCREEN))
  1323         && _this->SetWindowGrab) {
  1324         _this->SetWindowGrab(_this, window);
  1325     }
  1326 }
  1327 
  1328 void
  1329 SDL_OnWindowFocusLost(SDL_Window * window)
  1330 {
  1331     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1332 
  1333     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1334         SDL_MinimizeWindow(window->id);
  1335         SDL_SetDisplayMode(NULL);
  1336     }
  1337     if (display->gamma && _this->SetDisplayGammaRamp) {
  1338         _this->SetDisplayGammaRamp(_this, display->saved_gamma);
  1339     }
  1340     if ((window->flags & (SDL_WINDOW_INPUT_GRABBED | SDL_WINDOW_FULLSCREEN))
  1341         && _this->SetWindowGrab) {
  1342         _this->SetWindowGrab(_this, window);
  1343     }
  1344 }
  1345 
  1346 SDL_WindowID
  1347 SDL_GetFocusWindow(void)
  1348 {
  1349     SDL_VideoDisplay *display;
  1350     int i;
  1351 
  1352     if (!_this) {
  1353         return 0;
  1354     }
  1355     display = &SDL_CurrentDisplay;
  1356     for (i = 0; i < display->num_windows; ++i) {
  1357         SDL_Window *window = &display->windows[i];
  1358 
  1359         if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
  1360             return window->id;
  1361         }
  1362     }
  1363     return 0;
  1364 }
  1365 
  1366 void
  1367 SDL_DestroyWindow(SDL_WindowID windowID)
  1368 {
  1369     int i, j;
  1370 
  1371     if (!_this) {
  1372         return;
  1373     }
  1374     /* Restore video mode, etc. */
  1375     SDL_SendWindowEvent(windowID, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
  1376 
  1377     for (i = 0; i < _this->num_displays; ++i) {
  1378         SDL_VideoDisplay *display = &_this->displays[i];
  1379         for (j = 0; j < display->num_windows; ++j) {
  1380             SDL_Window *window = &display->windows[j];
  1381             if (window->id != windowID) {
  1382                 continue;
  1383             }
  1384             if (window->title) {
  1385                 SDL_free(window->title);
  1386                 window->title = NULL;
  1387             }
  1388             if (window->renderer) {
  1389                 SDL_DestroyRenderer(window->id);
  1390                 window->renderer = NULL;
  1391             }
  1392             if (_this->DestroyWindow) {
  1393                 _this->DestroyWindow(_this, window);
  1394             }
  1395             if (window->flags & SDL_WINDOW_OPENGL) {
  1396                 SDL_GL_UnloadLibrary();
  1397             }
  1398             if (j != display->num_windows - 1) {
  1399                 SDL_memcpy(&display->windows[i],
  1400                            &display->windows[i + 1],
  1401                            (display->num_windows - i - 1) * sizeof(*window));
  1402             }
  1403             --display->num_windows;
  1404             return;
  1405         }
  1406     }
  1407 }
  1408 
  1409 void
  1410 SDL_AddRenderDriver(int displayIndex, const SDL_RenderDriver * driver)
  1411 {
  1412     SDL_VideoDisplay *display;
  1413     SDL_RenderDriver *render_drivers;
  1414 
  1415     if (displayIndex >= _this->num_displays) {
  1416         return;
  1417     }
  1418     display = &_this->displays[displayIndex];
  1419 
  1420     render_drivers =
  1421         SDL_realloc(display->render_drivers,
  1422                     (display->num_render_drivers +
  1423                      1) * sizeof(*render_drivers));
  1424     if (render_drivers) {
  1425         render_drivers[display->num_render_drivers] = *driver;
  1426         display->render_drivers = render_drivers;
  1427         display->num_render_drivers++;
  1428     }
  1429 }
  1430 
  1431 int
  1432 SDL_GetNumRenderDrivers(void)
  1433 {
  1434     if (_this) {
  1435         return SDL_CurrentDisplay.num_render_drivers;
  1436     }
  1437     return 0;
  1438 }
  1439 
  1440 int
  1441 SDL_GetRenderDriverInfo(int index, SDL_RendererInfo * info)
  1442 {
  1443     if (!_this) {
  1444         SDL_UninitializedVideo();
  1445         return -1;
  1446     }
  1447     if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
  1448         SDL_SetError("index must be in the range of 0 - %d",
  1449                      SDL_GetNumRenderDrivers() - 1);
  1450         return -1;
  1451     }
  1452     *info = SDL_CurrentDisplay.render_drivers[index].info;
  1453     return 0;
  1454 }
  1455 
  1456 int
  1457 SDL_CreateRenderer(SDL_WindowID windowID, int index, Uint32 flags)
  1458 {
  1459     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1460 
  1461     if (!window) {
  1462         SDL_SetError("Invalid window ID");
  1463         return -1;
  1464     }
  1465     if (index < 0) {
  1466         const char *override = SDL_getenv("SDL_VIDEO_RENDERER");
  1467         int n = SDL_GetNumRenderDrivers();
  1468         for (index = 0; index < n; ++index) {
  1469             SDL_RenderDriver *driver =
  1470                 &SDL_CurrentDisplay.render_drivers[index];
  1471 
  1472             if (override) {
  1473                 if (SDL_strcasecmp(override, driver->info.name) == 0) {
  1474                     break;
  1475                 }
  1476             } else {
  1477                 if ((driver->info.flags & flags) == flags) {
  1478                     break;
  1479                 }
  1480             }
  1481         }
  1482         if (index == n) {
  1483             SDL_SetError("Couldn't find matching render driver");
  1484             return -1;
  1485         }
  1486     }
  1487     if (index >= SDL_GetNumRenderDrivers()) {
  1488         SDL_SetError("index must be -1 or in the range of 0 - %d",
  1489                      SDL_GetNumRenderDrivers() - 1);
  1490         return -1;
  1491     }
  1492     /* Free any existing renderer */
  1493     SDL_DestroyRenderer(windowID);
  1494 
  1495     /* Create a new renderer instance */
  1496     window->renderer = SDL_CurrentDisplay.render_drivers[index]
  1497         .CreateRenderer(window, flags);
  1498 
  1499     if (window->renderer==NULL)
  1500     {
  1501        /* Assuming renderer set its error */
  1502        return -1;
  1503     }
  1504 
  1505     SDL_SelectRenderer(window->id);
  1506 
  1507     return 0;
  1508 }
  1509 
  1510 int
  1511 SDL_SelectRenderer(SDL_WindowID windowID)
  1512 {
  1513     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1514     SDL_Renderer *renderer;
  1515 
  1516     if (!window || !window->renderer) {
  1517         return -1;
  1518     }
  1519     renderer = window->renderer;
  1520     if (renderer && renderer->ActivateRenderer) {
  1521         if (renderer->ActivateRenderer(renderer) < 0) {
  1522             return -1;
  1523         }
  1524     }
  1525     SDL_CurrentDisplay.current_renderer = renderer;
  1526     return 0;
  1527 }
  1528 
  1529 int
  1530 SDL_GetRendererInfo(SDL_RendererInfo * info)
  1531 {
  1532     if (!_this) {
  1533         SDL_UninitializedVideo();
  1534         return -1;
  1535     }
  1536     if (!SDL_CurrentDisplay.current_renderer) {
  1537         SDL_SetError("There is no current renderer");
  1538         return -1;
  1539     }
  1540     *info = SDL_CurrentDisplay.current_renderer->info;
  1541     return 0;
  1542 }
  1543 
  1544 SDL_TextureID
  1545 SDL_CreateTexture(Uint32 format, int access, int w, int h)
  1546 {
  1547     int hash;
  1548     SDL_Renderer *renderer;
  1549     SDL_Texture *texture;
  1550 
  1551     if (!_this) {
  1552         SDL_UninitializedVideo();
  1553         return 0;
  1554     }
  1555     renderer = SDL_CurrentDisplay.current_renderer;
  1556     if (!renderer) {
  1557         return 0;
  1558     }
  1559     if (!renderer->CreateTexture) {
  1560         SDL_Unsupported();
  1561         return 0;
  1562     }
  1563     texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
  1564     if (!texture) {
  1565         SDL_OutOfMemory();
  1566         return 0;
  1567     }
  1568     texture->id = _this->next_object_id++;
  1569     texture->format = format;
  1570     texture->access = access;
  1571     texture->w = w;
  1572     texture->h = h;
  1573     texture->r = 255;
  1574     texture->g = 255;
  1575     texture->b = 255;
  1576     texture->a = 255;
  1577     texture->renderer = renderer;
  1578 
  1579     if (renderer->CreateTexture(renderer, texture) < 0) {
  1580         if (renderer->DestroyTexture) {
  1581             renderer->DestroyTexture(renderer, texture);
  1582         }
  1583         SDL_free(texture);
  1584         return 0;
  1585     }
  1586     hash = (texture->id % SDL_arraysize(SDL_CurrentDisplay.textures));
  1587     texture->next = SDL_CurrentDisplay.textures[hash];
  1588     SDL_CurrentDisplay.textures[hash] = texture;
  1589 
  1590     return texture->id;
  1591 }
  1592 
  1593 SDL_TextureID
  1594 SDL_CreateTextureFromSurface(Uint32 format, SDL_Surface * surface)
  1595 {
  1596     SDL_TextureID textureID;
  1597     Uint32 requested_format = format;
  1598     SDL_PixelFormat *fmt;
  1599     int bpp;
  1600     Uint32 Rmask, Gmask, Bmask, Amask;
  1601 
  1602     if (!surface) {
  1603         SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
  1604         return 0;
  1605     }
  1606     fmt = surface->format;
  1607 
  1608     if (format) {
  1609         if (!SDL_PixelFormatEnumToMasks
  1610             (format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
  1611             SDL_SetError("Unknown pixel format");
  1612             return 0;
  1613         }
  1614     } else {
  1615         /* FIXME: Get the best supported texture format */
  1616         if (surface->format->Amask
  1617             || !(surface->map->info.flags &
  1618                  (SDL_COPY_COLORKEY | SDL_COPY_MASK | SDL_COPY_BLEND))) {
  1619             bpp = fmt->BitsPerPixel;
  1620             Rmask = fmt->Rmask;
  1621             Gmask = fmt->Gmask;
  1622             Bmask = fmt->Bmask;
  1623             Amask = fmt->Amask;
  1624         } else {
  1625             /* Need a format with alpha */
  1626             bpp = 32;
  1627             Rmask = 0x00FF0000;
  1628             Gmask = 0x0000FF00;
  1629             Bmask = 0x000000FF;
  1630             Amask = 0xFF000000;
  1631         }
  1632         format = SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
  1633         if (!format) {
  1634             SDL_SetError("Unknown pixel format");
  1635             return 0;
  1636         }
  1637     }
  1638 
  1639     textureID =
  1640         SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1641                           surface->h);
  1642     if (!textureID && !requested_format) {
  1643         SDL_DisplayMode desktop_mode;
  1644         SDL_GetDesktopDisplayMode(&desktop_mode);
  1645         format = desktop_mode.format;
  1646         textureID =
  1647             SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1648                               surface->h);
  1649     }
  1650     if (!textureID) {
  1651         return 0;
  1652     }
  1653     if (bpp == fmt->BitsPerPixel && Rmask == fmt->Rmask && Gmask == fmt->Gmask
  1654         && Bmask == fmt->Bmask && Amask == fmt->Amask) {
  1655         if (SDL_MUSTLOCK(surface)) {
  1656             if (SDL_LockSurface(surface) < 0) {
  1657                 SDL_DestroyTexture(textureID);
  1658                 return 0;
  1659             }
  1660             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1661                               surface->pitch);
  1662             SDL_UnlockSurface(surface);
  1663         } else {
  1664             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1665                               surface->pitch);
  1666         }
  1667     } else {
  1668         SDL_PixelFormat dst_fmt;
  1669         SDL_Surface *dst = NULL;
  1670 
  1671         /* Set up a destination surface for the texture update */
  1672         SDL_InitFormat(&dst_fmt, bpp, Rmask, Gmask, Bmask, Amask);
  1673         if (SDL_ISPIXELFORMAT_INDEXED(format)) {
  1674             dst_fmt.palette =
  1675                 SDL_AllocPalette((1 << SDL_BITSPERPIXEL(format)));
  1676             if (dst_fmt.palette) {
  1677                 /*
  1678                  * FIXME: Should we try to copy
  1679                  * fmt->palette?
  1680                  */
  1681                 SDL_DitherColors(dst_fmt.palette->colors,
  1682                                  SDL_BITSPERPIXEL(format));
  1683             }
  1684         }
  1685         dst = SDL_ConvertSurface(surface, &dst_fmt, 0);
  1686         if (dst) {
  1687             SDL_UpdateTexture(textureID, NULL, dst->pixels, dst->pitch);
  1688             SDL_FreeSurface(dst);
  1689         }
  1690         if (dst_fmt.palette) {
  1691             SDL_FreePalette(dst_fmt.palette);
  1692         }
  1693         if (!dst) {
  1694             SDL_DestroyTexture(textureID);
  1695             return 0;
  1696         }
  1697     }
  1698 
  1699     {
  1700         Uint8 r, g, b, a;
  1701         int blendMode;
  1702         int scaleMode;
  1703 
  1704         SDL_GetSurfaceColorMod(surface, &r, &g, &b);
  1705         SDL_SetTextureColorMod(textureID, r, g, b);
  1706 
  1707         SDL_GetSurfaceAlphaMod(surface, &a);
  1708         SDL_SetTextureAlphaMod(textureID, a);
  1709 
  1710         SDL_GetSurfaceBlendMode(surface, &blendMode);
  1711         SDL_SetTextureBlendMode(textureID, blendMode);
  1712 
  1713         SDL_GetSurfaceScaleMode(surface, &scaleMode);
  1714         SDL_SetTextureScaleMode(textureID, scaleMode);
  1715     }
  1716 
  1717     if (SDL_ISPIXELFORMAT_INDEXED(format) && fmt->palette) {
  1718         SDL_SetTexturePalette(textureID, fmt->palette->colors, 0,
  1719                               fmt->palette->ncolors);
  1720     }
  1721     return textureID;
  1722 }
  1723 
  1724 static __inline__ SDL_Texture *
  1725 SDL_GetTextureFromID(SDL_TextureID textureID)
  1726 {
  1727     int hash;
  1728     SDL_Texture *texture;
  1729 
  1730     if (!_this) {
  1731         return NULL;
  1732     }
  1733     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  1734     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  1735          texture = texture->next) {
  1736         if (texture->id == textureID) {
  1737             return texture;
  1738         }
  1739     }
  1740     return NULL;
  1741 }
  1742 
  1743 int
  1744 SDL_QueryTexture(SDL_TextureID textureID, Uint32 * format, int *access,
  1745                  int *w, int *h)
  1746 {
  1747     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1748 
  1749     if (!texture) {
  1750         return -1;
  1751     }
  1752     if (format) {
  1753         *format = texture->format;
  1754     }
  1755     if (access) {
  1756         *access = texture->access;
  1757     }
  1758     if (w) {
  1759         *w = texture->w;
  1760     }
  1761     if (h) {
  1762         *h = texture->h;
  1763     }
  1764     return 0;
  1765 }
  1766 
  1767 int
  1768 SDL_QueryTexturePixels(SDL_TextureID textureID, void **pixels, int *pitch)
  1769 {
  1770     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1771     SDL_Renderer *renderer;
  1772 
  1773     if (!texture) {
  1774         return -1;
  1775     }
  1776     renderer = texture->renderer;
  1777     if (!renderer->QueryTexturePixels) {
  1778         SDL_Unsupported();
  1779         return -1;
  1780     }
  1781     return renderer->QueryTexturePixels(renderer, texture, pixels, pitch);
  1782 }
  1783 
  1784 int
  1785 SDL_SetTexturePalette(SDL_TextureID textureID, const SDL_Color * colors,
  1786                       int firstcolor, int ncolors)
  1787 {
  1788     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1789     SDL_Renderer *renderer;
  1790 
  1791     if (!texture) {
  1792         return -1;
  1793     }
  1794     renderer = texture->renderer;
  1795     if (!renderer->SetTexturePalette) {
  1796         SDL_Unsupported();
  1797         return -1;
  1798     }
  1799     return renderer->SetTexturePalette(renderer, texture, colors, firstcolor,
  1800                                        ncolors);
  1801 }
  1802 
  1803 int
  1804 SDL_GetTexturePalette(SDL_TextureID textureID, SDL_Color * colors,
  1805                       int firstcolor, int ncolors)
  1806 {
  1807     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1808     SDL_Renderer *renderer;
  1809 
  1810     if (!texture) {
  1811         return -1;
  1812     }
  1813     renderer = texture->renderer;
  1814     if (!renderer->GetTexturePalette) {
  1815         SDL_Unsupported();
  1816         return -1;
  1817     }
  1818     return renderer->GetTexturePalette(renderer, texture, colors, firstcolor,
  1819                                        ncolors);
  1820 }
  1821 
  1822 int
  1823 SDL_SetTextureColorMod(SDL_TextureID textureID, Uint8 r, Uint8 g, Uint8 b)
  1824 {
  1825     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1826     SDL_Renderer *renderer;
  1827 
  1828     if (!texture) {
  1829         return -1;
  1830     }
  1831     renderer = texture->renderer;
  1832     if (!renderer->SetTextureColorMod) {
  1833         SDL_Unsupported();
  1834         return -1;
  1835     }
  1836     if (r < 255 || g < 255 || b < 255) {
  1837         texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
  1838     } else {
  1839         texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
  1840     }
  1841     texture->r = r;
  1842     texture->g = g;
  1843     texture->b = b;
  1844     return renderer->SetTextureColorMod(renderer, texture);
  1845 }
  1846 
  1847 int
  1848 SDL_GetTextureColorMod(SDL_TextureID textureID, Uint8 * r, Uint8 * g,
  1849                        Uint8 * b)
  1850 {
  1851     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1852     SDL_Renderer *renderer;
  1853 
  1854     if (!texture) {
  1855         return -1;
  1856     }
  1857     renderer = texture->renderer;
  1858     if (r) {
  1859         *r = texture->r;
  1860     }
  1861     if (g) {
  1862         *g = texture->g;
  1863     }
  1864     if (b) {
  1865         *b = texture->b;
  1866     }
  1867     return 0;
  1868 }
  1869 
  1870 int
  1871 SDL_SetTextureAlphaMod(SDL_TextureID textureID, Uint8 alpha)
  1872 {
  1873     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1874     SDL_Renderer *renderer;
  1875 
  1876     if (!texture) {
  1877         return -1;
  1878     }
  1879     renderer = texture->renderer;
  1880     if (!renderer->SetTextureAlphaMod) {
  1881         SDL_Unsupported();
  1882         return -1;
  1883     }
  1884     if (alpha < 255) {
  1885         texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
  1886     } else {
  1887         texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
  1888     }
  1889     texture->a = alpha;
  1890     return renderer->SetTextureAlphaMod(renderer, texture);
  1891 }
  1892 
  1893 int
  1894 SDL_GetTextureAlphaMod(SDL_TextureID textureID, Uint8 * alpha)
  1895 {
  1896     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1897 
  1898     if (!texture) {
  1899         return -1;
  1900     }
  1901     if (alpha) {
  1902         *alpha = texture->a;
  1903     }
  1904     return 0;
  1905 }
  1906 
  1907 int
  1908 SDL_SetTextureBlendMode(SDL_TextureID textureID, int blendMode)
  1909 {
  1910     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1911     SDL_Renderer *renderer;
  1912 
  1913     if (!texture) {
  1914         return -1;
  1915     }
  1916     renderer = texture->renderer;
  1917     if (!renderer->SetTextureBlendMode) {
  1918         SDL_Unsupported();
  1919         return -1;
  1920     }
  1921     texture->blendMode = blendMode;
  1922     return renderer->SetTextureBlendMode(renderer, texture);
  1923 }
  1924 
  1925 int
  1926 SDL_GetTextureBlendMode(SDL_TextureID textureID, int *blendMode)
  1927 {
  1928     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1929 
  1930     if (!texture) {
  1931         return -1;
  1932     }
  1933     if (blendMode) {
  1934         *blendMode = texture->blendMode;
  1935     }
  1936     return 0;
  1937 }
  1938 
  1939 int
  1940 SDL_SetTextureScaleMode(SDL_TextureID textureID, int scaleMode)
  1941 {
  1942     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1943     SDL_Renderer *renderer;
  1944 
  1945     if (!texture) {
  1946         return -1;
  1947     }
  1948     renderer = texture->renderer;
  1949     if (!renderer->SetTextureScaleMode) {
  1950         SDL_Unsupported();
  1951         return -1;
  1952     }
  1953     texture->scaleMode = scaleMode;
  1954     return renderer->SetTextureScaleMode(renderer, texture);
  1955 }
  1956 
  1957 int
  1958 SDL_GetTextureScaleMode(SDL_TextureID textureID, int *scaleMode)
  1959 {
  1960     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1961 
  1962     if (!texture) {
  1963         return -1;
  1964     }
  1965     if (scaleMode) {
  1966         *scaleMode = texture->scaleMode;
  1967     }
  1968     return 0;
  1969 }
  1970 
  1971 int
  1972 SDL_UpdateTexture(SDL_TextureID textureID, const SDL_Rect * rect,
  1973                   const void *pixels, int pitch)
  1974 {
  1975     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1976     SDL_Renderer *renderer;
  1977     SDL_Rect full_rect;
  1978 
  1979     if (!texture) {
  1980         return -1;
  1981     }
  1982     renderer = texture->renderer;
  1983     if (!renderer->UpdateTexture) {
  1984         SDL_Unsupported();
  1985         return -1;
  1986     }
  1987     if (!rect) {
  1988         full_rect.x = 0;
  1989         full_rect.y = 0;
  1990         full_rect.w = texture->w;
  1991         full_rect.h = texture->h;
  1992         rect = &full_rect;
  1993     }
  1994     return renderer->UpdateTexture(renderer, texture, rect, pixels, pitch);
  1995 }
  1996 
  1997 int
  1998 SDL_LockTexture(SDL_TextureID textureID, const SDL_Rect * rect, int markDirty,
  1999                 void **pixels, int *pitch)
  2000 {
  2001     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2002     SDL_Renderer *renderer;
  2003     SDL_Rect full_rect;
  2004 
  2005     if (!texture) {
  2006         return -1;
  2007     }
  2008     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  2009         SDL_SetError("SDL_LockTexture(): texture must be streaming");
  2010         return -1;
  2011     }
  2012     renderer = texture->renderer;
  2013     if (!renderer->LockTexture) {
  2014         SDL_Unsupported();
  2015         return -1;
  2016     }
  2017     if (!rect) {
  2018         full_rect.x = 0;
  2019         full_rect.y = 0;
  2020         full_rect.w = texture->w;
  2021         full_rect.h = texture->h;
  2022         rect = &full_rect;
  2023     }
  2024     return renderer->LockTexture(renderer, texture, rect, markDirty, pixels,
  2025                                  pitch);
  2026 }
  2027 
  2028 void
  2029 SDL_UnlockTexture(SDL_TextureID textureID)
  2030 {
  2031     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2032     SDL_Renderer *renderer;
  2033 
  2034     if (!texture) {
  2035         return;
  2036     }
  2037     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  2038         return;
  2039     }
  2040     renderer = texture->renderer;
  2041     if (!renderer->UnlockTexture) {
  2042         return;
  2043     }
  2044     renderer->UnlockTexture(renderer, texture);
  2045 }
  2046 
  2047 void
  2048 SDL_DirtyTexture(SDL_TextureID textureID, int numrects,
  2049                  const SDL_Rect * rects)
  2050 {
  2051     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2052     SDL_Renderer *renderer;
  2053 
  2054     if (!texture) {
  2055         return;
  2056     }
  2057     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  2058         return;
  2059     }
  2060     renderer = texture->renderer;
  2061     if (!renderer->DirtyTexture) {
  2062         return;
  2063     }
  2064     renderer->DirtyTexture(renderer, texture, numrects, rects);
  2065 }
  2066 
  2067 int
  2068 SDL_SetRenderDrawColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a)
  2069 {
  2070     SDL_Renderer *renderer;
  2071 
  2072     if (!_this) {
  2073         SDL_UninitializedVideo();
  2074         return -1;
  2075     }
  2076     renderer = SDL_CurrentDisplay.current_renderer;
  2077     if (!renderer) {
  2078         return -1;
  2079     }
  2080     renderer->r = r;
  2081     renderer->g = g;
  2082     renderer->b = b;
  2083     renderer->a = a;
  2084     if (renderer->SetDrawColor) {
  2085         return renderer->SetDrawColor(renderer);
  2086     } else {
  2087         return 0;
  2088     }
  2089 }
  2090 
  2091 int
  2092 SDL_GetRenderDrawColor(Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a)
  2093 {
  2094     SDL_Renderer *renderer;
  2095 
  2096     if (!_this) {
  2097         SDL_UninitializedVideo();
  2098         return -1;
  2099     }
  2100     renderer = SDL_CurrentDisplay.current_renderer;
  2101     if (!renderer) {
  2102         return -1;
  2103     }
  2104     if (r) {
  2105         *r = renderer->r;
  2106     }
  2107     if (g) {
  2108         *g = renderer->g;
  2109     }
  2110     if (b) {
  2111         *b = renderer->b;
  2112     }
  2113     if (a) {
  2114         *a = renderer->a;
  2115     }
  2116     return 0;
  2117 }
  2118 
  2119 int
  2120 SDL_SetRenderDrawBlendMode(int blendMode)
  2121 {
  2122     SDL_Renderer *renderer;
  2123 
  2124     if (!_this) {
  2125         SDL_UninitializedVideo();
  2126         return -1;
  2127     }
  2128     renderer = SDL_CurrentDisplay.current_renderer;
  2129     if (!renderer) {
  2130         return -1;
  2131     }
  2132     renderer->blendMode = blendMode;
  2133     if (renderer->SetDrawBlendMode) {
  2134         return renderer->SetDrawBlendMode(renderer);
  2135     } else {
  2136         return 0;
  2137     }
  2138 }
  2139 
  2140 int
  2141 SDL_GetRenderDrawBlendMode(int *blendMode)
  2142 {
  2143     SDL_Renderer *renderer;
  2144 
  2145     if (!_this) {
  2146         SDL_UninitializedVideo();
  2147         return -1;
  2148     }
  2149     renderer = SDL_CurrentDisplay.current_renderer;
  2150     if (!renderer) {
  2151         return -1;
  2152     }
  2153     *blendMode = renderer->blendMode;
  2154     return 0;
  2155 }
  2156 
  2157 int
  2158 SDL_RenderPoint(int x, int y)
  2159 {
  2160     SDL_Renderer *renderer;
  2161     SDL_Window *window;
  2162 
  2163     if (!_this) {
  2164         SDL_UninitializedVideo();
  2165         return -1;
  2166     }
  2167     renderer = SDL_CurrentDisplay.current_renderer;
  2168     if (!renderer) {
  2169         return -1;
  2170     }
  2171     if (!renderer->RenderPoint) {
  2172         SDL_Unsupported();
  2173         return -1;
  2174     }
  2175     window = SDL_GetWindowFromID(renderer->window);
  2176     if (x < 0 || y < 0 || x >= window->w || y >= window->h) {
  2177         return 0;
  2178     }
  2179     return renderer->RenderPoint(renderer, x, y);
  2180 }
  2181 
  2182 int
  2183 SDL_RenderLine(int x1, int y1, int x2, int y2)
  2184 {
  2185     SDL_Renderer *renderer;
  2186     SDL_Window *window;
  2187     SDL_Rect real_rect;
  2188 
  2189     if (x1 == x2 && y1 == y2) {
  2190         return SDL_RenderPoint(x1, y1);
  2191     }
  2192 
  2193     if (!_this) {
  2194         SDL_UninitializedVideo();
  2195         return -1;
  2196     }
  2197     renderer = SDL_CurrentDisplay.current_renderer;
  2198     if (!renderer) {
  2199         return -1;
  2200     }
  2201     if (!renderer->RenderLine) {
  2202         SDL_Unsupported();
  2203         return -1;
  2204     }
  2205     window = SDL_GetWindowFromID(renderer->window);
  2206 
  2207     real_rect.x = 0;
  2208     real_rect.y = 0;
  2209     real_rect.w = window->w;
  2210     real_rect.h = window->h;
  2211     if (!SDL_IntersectRectAndLine(&real_rect, &x1, &y1, &x2, &y2)) {
  2212         return (0);
  2213     }
  2214     return renderer->RenderLine(renderer, x1, y1, x2, y2);
  2215 }
  2216 
  2217 int
  2218 SDL_RenderFill(const SDL_Rect * rect)
  2219 {
  2220     SDL_Renderer *renderer;
  2221     SDL_Window *window;
  2222     SDL_Rect real_rect;
  2223 
  2224     if (!_this) {
  2225         SDL_UninitializedVideo();
  2226         return -1;
  2227     }
  2228     renderer = SDL_CurrentDisplay.current_renderer;
  2229     if (!renderer) {
  2230         return -1;
  2231     }
  2232     if (!renderer->RenderFill) {
  2233         SDL_Unsupported();
  2234         return -1;
  2235     }
  2236     window = SDL_GetWindowFromID(renderer->window);
  2237 
  2238     real_rect.x = 0;
  2239     real_rect.y = 0;
  2240     real_rect.w = window->w;
  2241     real_rect.h = window->h;
  2242     if (rect) {
  2243         if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
  2244             return 0;
  2245         }
  2246     }
  2247     return renderer->RenderFill(renderer, &real_rect);
  2248 }
  2249 
  2250 int
  2251 SDL_RenderCopy(SDL_TextureID textureID, const SDL_Rect * srcrect,
  2252                const SDL_Rect * dstrect)
  2253 {
  2254     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2255     SDL_Renderer *renderer;
  2256     SDL_Window *window;
  2257     SDL_Rect real_srcrect;
  2258     SDL_Rect real_dstrect;
  2259 
  2260     if (!texture || texture->renderer != SDL_CurrentDisplay.current_renderer) {
  2261         return -1;
  2262     }
  2263     renderer = SDL_CurrentDisplay.current_renderer;
  2264     if (!renderer) {
  2265         return -1;
  2266     }
  2267     if (!renderer->RenderCopy) {
  2268         SDL_Unsupported();
  2269         return -1;
  2270     }
  2271     window = SDL_GetWindowFromID(renderer->window);
  2272 
  2273     real_srcrect.x = 0;
  2274     real_srcrect.y = 0;
  2275     real_srcrect.w = texture->w;
  2276     real_srcrect.h = texture->h;
  2277     if (srcrect) {
  2278         if (!SDL_IntersectRect(srcrect, &real_srcrect, &real_srcrect)) {
  2279             return 0;
  2280         }
  2281     }
  2282 
  2283     real_dstrect.x = 0;
  2284     real_dstrect.y = 0;
  2285     real_dstrect.w = window->w;
  2286     real_dstrect.h = window->h;
  2287     if (dstrect) {
  2288         if (!SDL_IntersectRect(dstrect, &real_dstrect, &real_dstrect)) {
  2289             return 0;
  2290         }
  2291         /* Clip srcrect by the same amount as dstrect was clipped */
  2292         if (dstrect->w != real_dstrect.w) {
  2293             int deltax = (real_dstrect.x - dstrect->x);
  2294             int deltaw = (real_dstrect.w - dstrect->w);
  2295             real_srcrect.x += (deltax * dstrect->w) / real_srcrect.w;
  2296             real_srcrect.w += (deltaw * dstrect->w) / real_srcrect.w;
  2297         }
  2298         if (dstrect->h != real_dstrect.h) {
  2299             int deltay = (real_dstrect.y - dstrect->y);
  2300             int deltah = (real_dstrect.h - dstrect->h);
  2301             real_srcrect.y += (deltay * dstrect->h) / real_srcrect.h;
  2302             real_srcrect.h += (deltah * dstrect->h) / real_srcrect.h;
  2303         }
  2304     }
  2305 
  2306     return renderer->RenderCopy(renderer, texture, &real_srcrect,
  2307                                 &real_dstrect);
  2308 }
  2309 
  2310 void
  2311 SDL_RenderPresent(void)
  2312 {
  2313     SDL_Renderer *renderer;
  2314 
  2315     if (!_this) {
  2316         SDL_UninitializedVideo();
  2317         return;
  2318     }
  2319     renderer = SDL_CurrentDisplay.current_renderer;
  2320     if (!renderer || !renderer->RenderPresent) {
  2321         return;
  2322     }
  2323     renderer->RenderPresent(renderer);
  2324 }
  2325 
  2326 void
  2327 SDL_DestroyTexture(SDL_TextureID textureID)
  2328 {
  2329     int hash;
  2330     SDL_Texture *prev, *texture;
  2331     SDL_Renderer *renderer;
  2332 
  2333     if (!_this) {
  2334         SDL_UninitializedVideo();
  2335         return;
  2336     }
  2337     /* Look up the texture in the hash table */
  2338     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  2339     prev = NULL;
  2340     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  2341          prev = texture, texture = texture->next) {
  2342         if (texture->id == textureID) {
  2343             break;
  2344         }
  2345     }
  2346     if (!texture) {
  2347         return;
  2348     }
  2349     /* Unlink the texture from the list */
  2350     if (prev) {
  2351         prev->next = texture->next;
  2352     } else {
  2353         SDL_CurrentDisplay.textures[hash] = texture->next;
  2354     }
  2355 
  2356     /* Free the texture */
  2357     renderer = texture->renderer;
  2358     renderer->DestroyTexture(renderer, texture);
  2359     SDL_free(texture);
  2360 }
  2361 
  2362 void
  2363 SDL_DestroyRenderer(SDL_WindowID windowID)
  2364 {
  2365     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2366     SDL_Renderer *renderer;
  2367     int i;
  2368 
  2369     if (!window) {
  2370         return;
  2371     }
  2372     renderer = window->renderer;
  2373     if (!renderer) {
  2374         return;
  2375     }
  2376     /* Free existing textures for this renderer */
  2377     for (i = 0; i < SDL_arraysize(SDL_CurrentDisplay.textures); ++i) {
  2378         SDL_Texture *texture;
  2379         SDL_Texture *prev = NULL;
  2380         SDL_Texture *next;
  2381         for (texture = SDL_CurrentDisplay.textures[i]; texture;
  2382              texture = next) {
  2383             next = texture->next;
  2384             if (texture->renderer == renderer) {
  2385                 if (prev) {
  2386                     prev->next = next;
  2387                 } else {
  2388                     SDL_CurrentDisplay.textures[i] = next;
  2389                 }
  2390                 renderer->DestroyTexture(renderer, texture);
  2391                 SDL_free(texture);
  2392             } else {
  2393                 prev = texture;
  2394             }
  2395         }
  2396     }
  2397 
  2398     /* Free the renderer instance */
  2399     renderer->DestroyRenderer(renderer);
  2400 
  2401     /* Clear references */
  2402     window->renderer = NULL;
  2403     if (SDL_CurrentDisplay.current_renderer == renderer) {
  2404         SDL_CurrentDisplay.current_renderer = NULL;
  2405     }
  2406 }
  2407 
  2408 SDL_bool
  2409 SDL_IsScreenSaverEnabled()
  2410 {
  2411     if (!_this) {
  2412         return SDL_TRUE;
  2413     }
  2414     return _this->suspend_screensaver ? SDL_FALSE : SDL_TRUE;
  2415 }
  2416 
  2417 void
  2418 SDL_EnableScreenSaver()
  2419 {
  2420     if (!_this) {
  2421         return;
  2422     }
  2423     if (!_this->suspend_screensaver) {
  2424         return;
  2425     }
  2426     _this->suspend_screensaver = SDL_FALSE;
  2427     if (_this->SuspendScreenSaver) {
  2428         _this->SuspendScreenSaver(_this);
  2429     }
  2430 }
  2431 
  2432 void
  2433 SDL_DisableScreenSaver()
  2434 {
  2435     if (!_this) {
  2436         return;
  2437     }
  2438     if (_this->suspend_screensaver) {
  2439         return;
  2440     }
  2441     _this->suspend_screensaver = SDL_TRUE;
  2442     if (_this->SuspendScreenSaver) {
  2443         _this->SuspendScreenSaver(_this);
  2444     }
  2445 }
  2446 
  2447 void
  2448 SDL_VideoQuit(void)
  2449 {
  2450     int i, j;
  2451 
  2452     if (!_this) {
  2453         return;
  2454     }
  2455     /* Halt event processing before doing anything else */
  2456     SDL_StopEventLoop();
  2457     SDL_EnableScreenSaver();
  2458 
  2459     /* Clean up the system video */
  2460     for (i = _this->num_displays; i--;) {
  2461         SDL_VideoDisplay *display = &_this->displays[i];
  2462         for (j = display->num_windows; j--;) {
  2463             SDL_DestroyWindow(display->windows[i].id);
  2464         }
  2465         if (display->windows) {
  2466             SDL_free(display->windows);
  2467             display->windows = NULL;
  2468         }
  2469         display->num_windows = 0;
  2470         if (display->render_drivers) {
  2471             SDL_free(display->render_drivers);
  2472             display->render_drivers = NULL;
  2473         }
  2474         display->num_render_drivers = 0;
  2475     }
  2476     _this->VideoQuit(_this);
  2477 
  2478     for (i = _this->num_displays; i--;) {
  2479         SDL_VideoDisplay *display = &_this->displays[i];
  2480         for (j = display->num_display_modes; j--;) {
  2481             if (display->display_modes[j].driverdata) {
  2482                 SDL_free(display->display_modes[j].driverdata);
  2483                 display->display_modes[j].driverdata = NULL;
  2484             }
  2485         }
  2486         if (display->display_modes) {
  2487             SDL_free(display->display_modes);
  2488             display->display_modes = NULL;
  2489         }
  2490         if (display->desktop_mode.driverdata) {
  2491             SDL_free(display->desktop_mode.driverdata);
  2492             display->desktop_mode.driverdata = NULL;
  2493         }
  2494         if (display->palette) {
  2495             SDL_FreePalette(display->palette);
  2496             display->palette = NULL;
  2497         }
  2498         if (display->gamma) {
  2499             SDL_free(display->gamma);
  2500             display->gamma = NULL;
  2501         }
  2502         if (display->driverdata) {
  2503             SDL_free(display->driverdata);
  2504             display->driverdata = NULL;
  2505         }
  2506     }
  2507     if (_this->displays) {
  2508         SDL_free(_this->displays);
  2509         _this->displays = NULL;
  2510     }
  2511     _this->free(_this);
  2512     _this = NULL;
  2513 }
  2514 
  2515 int
  2516 SDL_GL_LoadLibrary(const char *path)
  2517 {
  2518     int retval;
  2519 
  2520     if (!_this) {
  2521         SDL_UninitializedVideo();
  2522         return -1;
  2523     }
  2524     if (_this->gl_config.driver_loaded) {
  2525         if (path && SDL_strcmp(path, _this->gl_config.driver_path) != 0) {
  2526             SDL_SetError("OpenGL library already loaded");
  2527             return -1;
  2528         }
  2529         retval = 0;
  2530     } else {
  2531         if (!_this->GL_LoadLibrary) {
  2532             SDL_SetError("No dynamic GL support in video driver");
  2533             return -1;
  2534         }
  2535         retval = _this->GL_LoadLibrary(_this, path);
  2536     }
  2537     if (retval == 0) {
  2538         ++_this->gl_config.driver_loaded;
  2539     }
  2540     return (retval);
  2541 }
  2542 
  2543 void *
  2544 SDL_GL_GetProcAddress(const char *proc)
  2545 {
  2546     void *func;
  2547 
  2548     if (!_this) {
  2549         SDL_UninitializedVideo();
  2550         return NULL;
  2551     }
  2552     func = NULL;
  2553     if (_this->GL_GetProcAddress) {
  2554         if (_this->gl_config.driver_loaded) {
  2555             func = _this->GL_GetProcAddress(_this, proc);
  2556         } else {
  2557             SDL_SetError("No GL driver has been loaded");
  2558         }
  2559     } else {
  2560         SDL_SetError("No dynamic GL support in video driver");
  2561     }
  2562     return func;
  2563 }
  2564 
  2565 void
  2566 SDL_GL_UnloadLibrary(void)
  2567 {
  2568     if (!_this) {
  2569         SDL_UninitializedVideo();
  2570         return;
  2571     }
  2572     if (_this->gl_config.driver_loaded > 0) {
  2573         if (--_this->gl_config.driver_loaded > 0) {
  2574             return;
  2575         }
  2576         if (_this->GL_UnloadLibrary) {
  2577             _this->GL_UnloadLibrary(_this);
  2578         }
  2579     }
  2580 }
  2581 
  2582 SDL_bool
  2583 SDL_GL_ExtensionSupported(const char *extension)
  2584 {
  2585 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2586     const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
  2587     const char *extensions;
  2588     const char *start;
  2589     const char *where, *terminator;
  2590 
  2591     /* Extension names should not have spaces. */
  2592     where = SDL_strchr(extension, ' ');
  2593     if (where || *extension == '\0') {
  2594         return SDL_FALSE;
  2595     }
  2596     /* See if there's an environment variable override */
  2597     start = SDL_getenv(extension);
  2598     if (start && *start == '0') {
  2599         return SDL_FALSE;
  2600     }
  2601     /* Lookup the available extensions */
  2602     glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
  2603     if (glGetStringFunc) {
  2604         extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
  2605     } else {
  2606         extensions = NULL;
  2607     }
  2608     if (!extensions) {
  2609         return SDL_FALSE;
  2610     }
  2611     /*
  2612      * It takes a bit of care to be fool-proof about parsing the OpenGL
  2613      * extensions string. Don't be fooled by sub-strings, etc.
  2614      */
  2615 
  2616     start = extensions;
  2617 
  2618     for (;;) {
  2619         where = SDL_strstr(start, extension);
  2620         if (!where)
  2621             break;
  2622 
  2623         terminator = where + SDL_strlen(extension);
  2624         if (where == start || *(where - 1) == ' ')
  2625             if (*terminator == ' ' || *terminator == '\0')
  2626                 return SDL_TRUE;
  2627 
  2628         start = terminator;
  2629     }
  2630     return SDL_FALSE;
  2631 #else
  2632     return SDL_FALSE;
  2633 #endif
  2634 }
  2635 
  2636 int
  2637 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
  2638 {
  2639 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2640     int retval;
  2641 
  2642     if (!_this) {
  2643         SDL_UninitializedVideo();
  2644         return -1;
  2645     }
  2646     retval = 0;
  2647     switch (attr) {
  2648     case SDL_GL_RED_SIZE:
  2649         _this->gl_config.red_size = value;
  2650         break;
  2651     case SDL_GL_GREEN_SIZE:
  2652         _this->gl_config.green_size = value;
  2653         break;
  2654     case SDL_GL_BLUE_SIZE:
  2655         _this->gl_config.blue_size = value;
  2656         break;
  2657     case SDL_GL_ALPHA_SIZE:
  2658         _this->gl_config.alpha_size = value;
  2659         break;
  2660     case SDL_GL_DOUBLEBUFFER:
  2661         _this->gl_config.double_buffer = value;
  2662         break;
  2663     case SDL_GL_BUFFER_SIZE:
  2664         _this->gl_config.buffer_size = value;
  2665         break;
  2666     case SDL_GL_DEPTH_SIZE:
  2667         _this->gl_config.depth_size = value;
  2668         break;
  2669     case SDL_GL_STENCIL_SIZE:
  2670         _this->gl_config.stencil_size = value;
  2671         break;
  2672     case SDL_GL_ACCUM_RED_SIZE:
  2673         _this->gl_config.accum_red_size = value;
  2674         break;
  2675     case SDL_GL_ACCUM_GREEN_SIZE:
  2676         _this->gl_config.accum_green_size = value;
  2677         break;
  2678     case SDL_GL_ACCUM_BLUE_SIZE:
  2679         _this->gl_config.accum_blue_size = value;
  2680         break;
  2681     case SDL_GL_ACCUM_ALPHA_SIZE:
  2682         _this->gl_config.accum_alpha_size = value;
  2683         break;
  2684     case SDL_GL_STEREO:
  2685         _this->gl_config.stereo = value;
  2686         break;
  2687     case SDL_GL_MULTISAMPLEBUFFERS:
  2688         _this->gl_config.multisamplebuffers = value;
  2689         break;
  2690     case SDL_GL_MULTISAMPLESAMPLES:
  2691         _this->gl_config.multisamplesamples = value;
  2692         break;
  2693     case SDL_GL_ACCELERATED_VISUAL:
  2694         _this->gl_config.accelerated = value;
  2695         break;
  2696     case SDL_GL_RETAINED_BACKING:
  2697         _this->gl_config.retained_backing = value;
  2698         break;
  2699     case SDL_GL_CONTEXT_MAJOR_VERSION:
  2700         _this->gl_config.major_version = value;
  2701         break;
  2702     case SDL_GL_CONTEXT_MINOR_VERSION:
  2703         _this->gl_config.minor_version = value;
  2704         break;
  2705     default:
  2706         SDL_SetError("Unknown OpenGL attribute");
  2707         retval = -1;
  2708         break;
  2709     }
  2710     return retval;
  2711 #else
  2712     SDL_Unsupported();
  2713     return -1;
  2714 #endif /* SDL_VIDEO_OPENGL */
  2715 }
  2716 
  2717 int
  2718 SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
  2719 {
  2720 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2721     void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2722     GLenum (APIENTRY * glGetErrorFunc) (void);
  2723     GLenum attrib = 0;
  2724     GLenum error = 0;
  2725 
  2726     glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2727     if (!glGetIntegervFunc) {
  2728         return -1;
  2729     }
  2730 
  2731     glGetErrorFunc = SDL_GL_GetProcAddress("glGetError");
  2732     if (!glGetErrorFunc) {
  2733         return -1;
  2734     }
  2735 
  2736     /* Clear value in any case */
  2737     *value=0;
  2738 
  2739     switch (attr) {
  2740     case SDL_GL_RETAINED_BACKING:
  2741         *value = _this->gl_config.retained_backing;
  2742         return 0;
  2743     case SDL_GL_RED_SIZE:
  2744         attrib = GL_RED_BITS;
  2745         break;
  2746     case SDL_GL_BLUE_SIZE:
  2747         attrib = GL_BLUE_BITS;
  2748         break;
  2749     case SDL_GL_GREEN_SIZE:
  2750         attrib = GL_GREEN_BITS;
  2751         break;
  2752     case SDL_GL_ALPHA_SIZE:
  2753         attrib = GL_ALPHA_BITS;
  2754         break;
  2755     case SDL_GL_DOUBLEBUFFER:
  2756 #ifndef SDL_VIDEO_OPENGL_ES
  2757         attrib = GL_DOUBLEBUFFER;
  2758         break;
  2759 #else
  2760         /* OpenGL ES 1.0 and above specifications have EGL_SINGLE_BUFFER      */
  2761         /* parameter which switches double buffer to single buffer. OpenGL ES */
  2762         /* SDL driver must set proper value after initialization              */
  2763         *value = _this->gl_config.double_buffer;
  2764         return 0;
  2765 #endif
  2766     case SDL_GL_DEPTH_SIZE:
  2767         attrib = GL_DEPTH_BITS;
  2768         break;
  2769     case SDL_GL_STENCIL_SIZE:
  2770         attrib = GL_STENCIL_BITS;
  2771         break;
  2772 #ifndef SDL_VIDEO_OPENGL_ES
  2773     case SDL_GL_ACCUM_RED_SIZE:
  2774         attrib = GL_ACCUM_RED_BITS;
  2775         break;
  2776     case SDL_GL_ACCUM_GREEN_SIZE:
  2777         attrib = GL_ACCUM_GREEN_BITS;
  2778         break;
  2779     case SDL_GL_ACCUM_BLUE_SIZE:
  2780         attrib = GL_ACCUM_BLUE_BITS;
  2781         break;
  2782     case SDL_GL_ACCUM_ALPHA_SIZE:
  2783         attrib = GL_ACCUM_ALPHA_BITS;
  2784         break;
  2785     case SDL_GL_STEREO:
  2786         attrib = GL_STEREO;
  2787         break;
  2788 #else
  2789     case SDL_GL_ACCUM_RED_SIZE:
  2790     case SDL_GL_ACCUM_GREEN_SIZE:
  2791     case SDL_GL_ACCUM_BLUE_SIZE:
  2792     case SDL_GL_ACCUM_ALPHA_SIZE:
  2793     case SDL_GL_STEREO:
  2794         /* none of these are supported in OpenGL ES */
  2795         *value = 0;
  2796         return 0;
  2797 #endif
  2798     case SDL_GL_MULTISAMPLEBUFFERS:
  2799 #ifndef SDL_VIDEO_OPENGL_ES
  2800         attrib = GL_SAMPLE_BUFFERS_ARB;
  2801 #else
  2802         attrib = GL_SAMPLE_BUFFERS;
  2803 #endif
  2804         break;
  2805     case SDL_GL_MULTISAMPLESAMPLES:
  2806 #ifndef SDL_VIDEO_OPENGL_ES
  2807         attrib = GL_SAMPLES_ARB;
  2808 #else
  2809         attrib = GL_SAMPLES;
  2810 #endif
  2811         break;
  2812     case SDL_GL_BUFFER_SIZE:
  2813         {
  2814             GLint bits = 0;
  2815             GLint component;
  2816 
  2817             /*
  2818              * there doesn't seem to be a single flag in OpenGL
  2819              * for this!
  2820              */
  2821             glGetIntegervFunc(GL_RED_BITS, &component);
  2822             bits += component;
  2823             glGetIntegervFunc(GL_GREEN_BITS, &component);
  2824             bits += component;
  2825             glGetIntegervFunc(GL_BLUE_BITS, &component);
  2826             bits += component;
  2827             glGetIntegervFunc(GL_ALPHA_BITS, &component);
  2828             bits += component;
  2829 
  2830             *value = bits;
  2831             return 0;
  2832         }
  2833     case SDL_GL_ACCELERATED_VISUAL:
  2834         {
  2835             /* FIXME: How do we get this information? */
  2836             *value = (_this->gl_config.accelerated != 0);
  2837             return 0;
  2838         }
  2839     default:
  2840         SDL_SetError("Unknown OpenGL attribute");
  2841         return -1;
  2842     }
  2843 
  2844     glGetIntegervFunc(attrib, (GLint *) value);
  2845     error=glGetErrorFunc();
  2846     if (error!=GL_NO_ERROR)
  2847     {
  2848        switch (error)
  2849        {
  2850           case GL_INVALID_ENUM:
  2851                {
  2852                   SDL_SetError("OpenGL error: GL_INVALID_ENUM");
  2853                }
  2854                break;
  2855           case GL_INVALID_VALUE:
  2856                {
  2857                   SDL_SetError("OpenGL error: GL_INVALID_VALUE");
  2858                }
  2859                break;
  2860           default:
  2861                {
  2862                   SDL_SetError("OpenGL error: %08X", error);
  2863                }
  2864                break;
  2865        }
  2866        return -1;
  2867     }
  2868     return 0;
  2869 #else
  2870     SDL_Unsupported();
  2871     return -1;
  2872 #endif /* SDL_VIDEO_OPENGL */
  2873 }
  2874 
  2875 SDL_GLContext
  2876 SDL_GL_CreateContext(SDL_WindowID windowID)
  2877 {
  2878     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2879 
  2880     if (!window) {
  2881         return NULL;
  2882     }
  2883     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2884         SDL_SetError("The specified window isn't an OpenGL window");
  2885         return NULL;
  2886     }
  2887     return _this->GL_CreateContext(_this, window);
  2888 }
  2889 
  2890 int
  2891 SDL_GL_MakeCurrent(SDL_WindowID windowID, SDL_GLContext context)
  2892 {
  2893     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2894 
  2895     if (window && !(window->flags & SDL_WINDOW_OPENGL)) {
  2896         SDL_SetError("The specified window isn't an OpenGL window");
  2897         return -1;
  2898     }
  2899     if (!context) {
  2900         window = NULL;
  2901     }
  2902     return _this->GL_MakeCurrent(_this, window, context);
  2903 }
  2904 
  2905 int
  2906 SDL_GL_SetSwapInterval(int interval)
  2907 {
  2908     if (!_this) {
  2909         SDL_UninitializedVideo();
  2910         return -1;
  2911     }
  2912     if (_this->GL_SetSwapInterval) {
  2913         return _this->GL_SetSwapInterval(_this, interval);
  2914     } else {
  2915         SDL_SetError("Setting the swap interval is not supported");
  2916         return -1;
  2917     }
  2918 }
  2919 
  2920 int
  2921 SDL_GL_GetSwapInterval(void)
  2922 {
  2923     if (!_this) {
  2924         SDL_UninitializedVideo();
  2925         return -1;
  2926     }
  2927     if (_this->GL_GetSwapInterval) {
  2928         return _this->GL_GetSwapInterval(_this);
  2929     } else {
  2930         SDL_SetError("Getting the swap interval is not supported");
  2931         return -1;
  2932     }
  2933 }
  2934 
  2935 void
  2936 SDL_GL_SwapWindow(SDL_WindowID windowID)
  2937 {
  2938     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2939 
  2940     if (!window) {
  2941         return;
  2942     }
  2943     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2944         SDL_SetError("The specified window isn't an OpenGL window");
  2945         return;
  2946     }
  2947     _this->GL_SwapWindow(_this, window);
  2948 }
  2949 
  2950 void
  2951 SDL_GL_DeleteContext(SDL_GLContext context)
  2952 {
  2953     if (!_this || !context) {
  2954         return;
  2955     }
  2956     _this->GL_MakeCurrent(_this, NULL, NULL);
  2957     _this->GL_DeleteContext(_this, context);
  2958 }
  2959 
  2960 #if 0                           // FIXME
  2961 /*
  2962  * Utility function used by SDL_WM_SetIcon(); flags & 1 for color key, flags
  2963  * & 2 for alpha channel.
  2964  */
  2965 static void
  2966 CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
  2967 {
  2968     int x, y;
  2969     Uint32 colorkey;
  2970 #define SET_MASKBIT(icon, x, y, mask) \
  2971 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  2972 
  2973     colorkey = icon->format->colorkey;
  2974     switch (icon->format->BytesPerPixel) {
  2975     case 1:
  2976         {
  2977             Uint8 *pixels;
  2978             for (y = 0; y < icon->h; ++y) {
  2979                 pixels = (Uint8 *) icon->pixels + y * icon->pitch;
  2980                 for (x = 0; x < icon->w; ++x) {
  2981                     if (*pixels++ == colorkey) {
  2982                         SET_MASKBIT(icon, x, y, mask);
  2983                     }
  2984                 }
  2985             }
  2986         }
  2987         break;
  2988 
  2989     case 2:
  2990         {
  2991             Uint16 *pixels;
  2992             for (y = 0; y < icon->h; ++y) {
  2993                 pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
  2994                 for (x = 0; x < icon->w; ++x) {
  2995                     if ((flags & 1) && *pixels == colorkey) {
  2996                         SET_MASKBIT(icon, x, y, mask);
  2997                     } else if ((flags & 2)
  2998                                && (*pixels & icon->format->Amask) == 0) {
  2999                         SET_MASKBIT(icon, x, y, mask);
  3000                     }
  3001                     pixels++;
  3002                 }
  3003             }
  3004         }
  3005         break;
  3006 
  3007     case 4:
  3008         {
  3009             Uint32 *pixels;
  3010             for (y = 0; y < icon->h; ++y) {
  3011                 pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
  3012                 for (x = 0; x < icon->w; ++x) {
  3013                     if ((flags & 1) && *pixels == colorkey) {
  3014                         SET_MASKBIT(icon, x, y, mask);
  3015                     } else if ((flags & 2)
  3016                                && (*pixels & icon->format->Amask) == 0) {
  3017                         SET_MASKBIT(icon, x, y, mask);
  3018                     }
  3019                     pixels++;
  3020                 }
  3021             }
  3022         }
  3023         break;
  3024     }
  3025 }
  3026 
  3027 /*
  3028  * Sets the window manager icon for the display window.
  3029  */
  3030 void
  3031 SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
  3032 {
  3033     if (icon && _this->SetIcon) {
  3034         /* Generate a mask if necessary, and create the icon! */
  3035         if (mask == NULL) {
  3036             int mask_len = icon->h * (icon->w + 7) / 8;
  3037             int flags = 0;
  3038             mask = (Uint8 *) SDL_malloc(mask_len);
  3039             if (mask == NULL) {
  3040                 return;
  3041             }
  3042             SDL_memset(mask, ~0, mask_len);
  3043             if (icon->flags & SDL_SRCCOLORKEY)
  3044                 flags |= 1;
  3045             if (icon->flags & SDL_SRCALPHA)
  3046                 flags |= 2;
  3047             if (flags) {
  3048                 CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  3049             }
  3050             _this->SetIcon(_this, icon, mask);
  3051             SDL_free(mask);
  3052         } else {
  3053             _this->SetIcon(_this, icon, mask);
  3054         }
  3055     }
  3056 }
  3057 #endif
  3058 
  3059 SDL_bool
  3060 SDL_GetWindowWMInfo(SDL_WindowID windowID, struct SDL_SysWMinfo *info)
  3061 {
  3062     SDL_Window *window = SDL_GetWindowFromID(windowID);
  3063 
  3064     if (!window || !_this->GetWindowWMInfo) {
  3065         return SDL_FALSE;
  3066     }
  3067     return (_this->GetWindowWMInfo(_this, window, info));
  3068 }
  3069 
  3070 void
  3071 SDL_StartTextInput(SDL_WindowID windowID)
  3072 {
  3073     SDL_Window *window = SDL_GetWindowFromID(windowID);
  3074 
  3075     if (_this->StartTextInput) {
  3076         _this->StartTextInput(_this, window);
  3077     }
  3078 }
  3079 
  3080 void
  3081 SDL_StopTextInput(void)
  3082 {
  3083     if (_this->StopTextInput) {
  3084         _this->StopTextInput(_this);
  3085     }
  3086 }
  3087 
  3088 void
  3089 SDL_SetTextInputRect(SDL_Rect *rect)
  3090 {
  3091     if (_this->SetTextInputRect) {
  3092         _this->SetTextInputRect(_this, rect);
  3093     }
  3094 }
  3095 
  3096 /* vi: set ts=4 sw=4 expandtab: */