src/video/SDL_video.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 23 May 2009 22:41:08 +0000
changeset 3139 7f684f249ec9
parent 3100 7dc982143c06
child 3141 3df74541339b
child 3161 494559cc723b
permissions -rw-r--r--
indent
     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         /* Assuming renderer set its error */
  1501         return -1;
  1502     }
  1503 
  1504     SDL_SelectRenderer(window->id);
  1505 
  1506     return 0;
  1507 }
  1508 
  1509 int
  1510 SDL_SelectRenderer(SDL_WindowID windowID)
  1511 {
  1512     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1513     SDL_Renderer *renderer;
  1514 
  1515     if (!window || !window->renderer) {
  1516         return -1;
  1517     }
  1518     renderer = window->renderer;
  1519     if (renderer && renderer->ActivateRenderer) {
  1520         if (renderer->ActivateRenderer(renderer) < 0) {
  1521             return -1;
  1522         }
  1523     }
  1524     SDL_CurrentDisplay.current_renderer = renderer;
  1525     return 0;
  1526 }
  1527 
  1528 int
  1529 SDL_GetRendererInfo(SDL_RendererInfo * info)
  1530 {
  1531     if (!_this) {
  1532         SDL_UninitializedVideo();
  1533         return -1;
  1534     }
  1535     if (!SDL_CurrentDisplay.current_renderer) {
  1536         SDL_SetError("There is no current renderer");
  1537         return -1;
  1538     }
  1539     *info = SDL_CurrentDisplay.current_renderer->info;
  1540     return 0;
  1541 }
  1542 
  1543 SDL_TextureID
  1544 SDL_CreateTexture(Uint32 format, int access, int w, int h)
  1545 {
  1546     int hash;
  1547     SDL_Renderer *renderer;
  1548     SDL_Texture *texture;
  1549 
  1550     if (!_this) {
  1551         SDL_UninitializedVideo();
  1552         return 0;
  1553     }
  1554     renderer = SDL_CurrentDisplay.current_renderer;
  1555     if (!renderer) {
  1556         return 0;
  1557     }
  1558     if (!renderer->CreateTexture) {
  1559         SDL_Unsupported();
  1560         return 0;
  1561     }
  1562     texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
  1563     if (!texture) {
  1564         SDL_OutOfMemory();
  1565         return 0;
  1566     }
  1567     texture->id = _this->next_object_id++;
  1568     texture->format = format;
  1569     texture->access = access;
  1570     texture->w = w;
  1571     texture->h = h;
  1572     texture->r = 255;
  1573     texture->g = 255;
  1574     texture->b = 255;
  1575     texture->a = 255;
  1576     texture->renderer = renderer;
  1577 
  1578     if (renderer->CreateTexture(renderer, texture) < 0) {
  1579         if (renderer->DestroyTexture) {
  1580             renderer->DestroyTexture(renderer, texture);
  1581         }
  1582         SDL_free(texture);
  1583         return 0;
  1584     }
  1585     hash = (texture->id % SDL_arraysize(SDL_CurrentDisplay.textures));
  1586     texture->next = SDL_CurrentDisplay.textures[hash];
  1587     SDL_CurrentDisplay.textures[hash] = texture;
  1588 
  1589     return texture->id;
  1590 }
  1591 
  1592 SDL_TextureID
  1593 SDL_CreateTextureFromSurface(Uint32 format, SDL_Surface * surface)
  1594 {
  1595     SDL_TextureID textureID;
  1596     Uint32 requested_format = format;
  1597     SDL_PixelFormat *fmt;
  1598     int bpp;
  1599     Uint32 Rmask, Gmask, Bmask, Amask;
  1600 
  1601     if (!surface) {
  1602         SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
  1603         return 0;
  1604     }
  1605     fmt = surface->format;
  1606 
  1607     if (format) {
  1608         if (!SDL_PixelFormatEnumToMasks
  1609             (format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
  1610             SDL_SetError("Unknown pixel format");
  1611             return 0;
  1612         }
  1613     } else {
  1614         /* FIXME: Get the best supported texture format */
  1615         if (surface->format->Amask
  1616             || !(surface->map->info.flags &
  1617                  (SDL_COPY_COLORKEY | SDL_COPY_MASK | SDL_COPY_BLEND))) {
  1618             bpp = fmt->BitsPerPixel;
  1619             Rmask = fmt->Rmask;
  1620             Gmask = fmt->Gmask;
  1621             Bmask = fmt->Bmask;
  1622             Amask = fmt->Amask;
  1623         } else {
  1624             /* Need a format with alpha */
  1625             bpp = 32;
  1626             Rmask = 0x00FF0000;
  1627             Gmask = 0x0000FF00;
  1628             Bmask = 0x000000FF;
  1629             Amask = 0xFF000000;
  1630         }
  1631         format = SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
  1632         if (!format) {
  1633             SDL_SetError("Unknown pixel format");
  1634             return 0;
  1635         }
  1636     }
  1637 
  1638     textureID =
  1639         SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1640                           surface->h);
  1641     if (!textureID && !requested_format) {
  1642         SDL_DisplayMode desktop_mode;
  1643         SDL_GetDesktopDisplayMode(&desktop_mode);
  1644         format = desktop_mode.format;
  1645         textureID =
  1646             SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1647                               surface->h);
  1648     }
  1649     if (!textureID) {
  1650         return 0;
  1651     }
  1652     if (bpp == fmt->BitsPerPixel && Rmask == fmt->Rmask && Gmask == fmt->Gmask
  1653         && Bmask == fmt->Bmask && Amask == fmt->Amask) {
  1654         if (SDL_MUSTLOCK(surface)) {
  1655             if (SDL_LockSurface(surface) < 0) {
  1656                 SDL_DestroyTexture(textureID);
  1657                 return 0;
  1658             }
  1659             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1660                               surface->pitch);
  1661             SDL_UnlockSurface(surface);
  1662         } else {
  1663             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1664                               surface->pitch);
  1665         }
  1666     } else {
  1667         SDL_PixelFormat dst_fmt;
  1668         SDL_Surface *dst = NULL;
  1669 
  1670         /* Set up a destination surface for the texture update */
  1671         SDL_InitFormat(&dst_fmt, bpp, Rmask, Gmask, Bmask, Amask);
  1672         if (SDL_ISPIXELFORMAT_INDEXED(format)) {
  1673             dst_fmt.palette =
  1674                 SDL_AllocPalette((1 << SDL_BITSPERPIXEL(format)));
  1675             if (dst_fmt.palette) {
  1676                 /*
  1677                  * FIXME: Should we try to copy
  1678                  * fmt->palette?
  1679                  */
  1680                 SDL_DitherColors(dst_fmt.palette->colors,
  1681                                  SDL_BITSPERPIXEL(format));
  1682             }
  1683         }
  1684         dst = SDL_ConvertSurface(surface, &dst_fmt, 0);
  1685         if (dst) {
  1686             SDL_UpdateTexture(textureID, NULL, dst->pixels, dst->pitch);
  1687             SDL_FreeSurface(dst);
  1688         }
  1689         if (dst_fmt.palette) {
  1690             SDL_FreePalette(dst_fmt.palette);
  1691         }
  1692         if (!dst) {
  1693             SDL_DestroyTexture(textureID);
  1694             return 0;
  1695         }
  1696     }
  1697 
  1698     {
  1699         Uint8 r, g, b, a;
  1700         int blendMode;
  1701         int scaleMode;
  1702 
  1703         SDL_GetSurfaceColorMod(surface, &r, &g, &b);
  1704         SDL_SetTextureColorMod(textureID, r, g, b);
  1705 
  1706         SDL_GetSurfaceAlphaMod(surface, &a);
  1707         SDL_SetTextureAlphaMod(textureID, a);
  1708 
  1709         SDL_GetSurfaceBlendMode(surface, &blendMode);
  1710         SDL_SetTextureBlendMode(textureID, blendMode);
  1711 
  1712         SDL_GetSurfaceScaleMode(surface, &scaleMode);
  1713         SDL_SetTextureScaleMode(textureID, scaleMode);
  1714     }
  1715 
  1716     if (SDL_ISPIXELFORMAT_INDEXED(format) && fmt->palette) {
  1717         SDL_SetTexturePalette(textureID, fmt->palette->colors, 0,
  1718                               fmt->palette->ncolors);
  1719     }
  1720     return textureID;
  1721 }
  1722 
  1723 static __inline__ SDL_Texture *
  1724 SDL_GetTextureFromID(SDL_TextureID textureID)
  1725 {
  1726     int hash;
  1727     SDL_Texture *texture;
  1728 
  1729     if (!_this) {
  1730         return NULL;
  1731     }
  1732     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  1733     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  1734          texture = texture->next) {
  1735         if (texture->id == textureID) {
  1736             return texture;
  1737         }
  1738     }
  1739     return NULL;
  1740 }
  1741 
  1742 int
  1743 SDL_QueryTexture(SDL_TextureID textureID, Uint32 * format, int *access,
  1744                  int *w, int *h)
  1745 {
  1746     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1747 
  1748     if (!texture) {
  1749         return -1;
  1750     }
  1751     if (format) {
  1752         *format = texture->format;
  1753     }
  1754     if (access) {
  1755         *access = texture->access;
  1756     }
  1757     if (w) {
  1758         *w = texture->w;
  1759     }
  1760     if (h) {
  1761         *h = texture->h;
  1762     }
  1763     return 0;
  1764 }
  1765 
  1766 int
  1767 SDL_QueryTexturePixels(SDL_TextureID textureID, void **pixels, int *pitch)
  1768 {
  1769     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1770     SDL_Renderer *renderer;
  1771 
  1772     if (!texture) {
  1773         return -1;
  1774     }
  1775     renderer = texture->renderer;
  1776     if (!renderer->QueryTexturePixels) {
  1777         SDL_Unsupported();
  1778         return -1;
  1779     }
  1780     return renderer->QueryTexturePixels(renderer, texture, pixels, pitch);
  1781 }
  1782 
  1783 int
  1784 SDL_SetTexturePalette(SDL_TextureID textureID, const SDL_Color * colors,
  1785                       int firstcolor, int ncolors)
  1786 {
  1787     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1788     SDL_Renderer *renderer;
  1789 
  1790     if (!texture) {
  1791         return -1;
  1792     }
  1793     renderer = texture->renderer;
  1794     if (!renderer->SetTexturePalette) {
  1795         SDL_Unsupported();
  1796         return -1;
  1797     }
  1798     return renderer->SetTexturePalette(renderer, texture, colors, firstcolor,
  1799                                        ncolors);
  1800 }
  1801 
  1802 int
  1803 SDL_GetTexturePalette(SDL_TextureID textureID, SDL_Color * colors,
  1804                       int firstcolor, int ncolors)
  1805 {
  1806     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1807     SDL_Renderer *renderer;
  1808 
  1809     if (!texture) {
  1810         return -1;
  1811     }
  1812     renderer = texture->renderer;
  1813     if (!renderer->GetTexturePalette) {
  1814         SDL_Unsupported();
  1815         return -1;
  1816     }
  1817     return renderer->GetTexturePalette(renderer, texture, colors, firstcolor,
  1818                                        ncolors);
  1819 }
  1820 
  1821 int
  1822 SDL_SetTextureColorMod(SDL_TextureID textureID, Uint8 r, Uint8 g, Uint8 b)
  1823 {
  1824     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1825     SDL_Renderer *renderer;
  1826 
  1827     if (!texture) {
  1828         return -1;
  1829     }
  1830     renderer = texture->renderer;
  1831     if (!renderer->SetTextureColorMod) {
  1832         SDL_Unsupported();
  1833         return -1;
  1834     }
  1835     if (r < 255 || g < 255 || b < 255) {
  1836         texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
  1837     } else {
  1838         texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
  1839     }
  1840     texture->r = r;
  1841     texture->g = g;
  1842     texture->b = b;
  1843     return renderer->SetTextureColorMod(renderer, texture);
  1844 }
  1845 
  1846 int
  1847 SDL_GetTextureColorMod(SDL_TextureID textureID, Uint8 * r, Uint8 * g,
  1848                        Uint8 * b)
  1849 {
  1850     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1851     SDL_Renderer *renderer;
  1852 
  1853     if (!texture) {
  1854         return -1;
  1855     }
  1856     renderer = texture->renderer;
  1857     if (r) {
  1858         *r = texture->r;
  1859     }
  1860     if (g) {
  1861         *g = texture->g;
  1862     }
  1863     if (b) {
  1864         *b = texture->b;
  1865     }
  1866     return 0;
  1867 }
  1868 
  1869 int
  1870 SDL_SetTextureAlphaMod(SDL_TextureID textureID, Uint8 alpha)
  1871 {
  1872     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1873     SDL_Renderer *renderer;
  1874 
  1875     if (!texture) {
  1876         return -1;
  1877     }
  1878     renderer = texture->renderer;
  1879     if (!renderer->SetTextureAlphaMod) {
  1880         SDL_Unsupported();
  1881         return -1;
  1882     }
  1883     if (alpha < 255) {
  1884         texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
  1885     } else {
  1886         texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
  1887     }
  1888     texture->a = alpha;
  1889     return renderer->SetTextureAlphaMod(renderer, texture);
  1890 }
  1891 
  1892 int
  1893 SDL_GetTextureAlphaMod(SDL_TextureID textureID, Uint8 * alpha)
  1894 {
  1895     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1896 
  1897     if (!texture) {
  1898         return -1;
  1899     }
  1900     if (alpha) {
  1901         *alpha = texture->a;
  1902     }
  1903     return 0;
  1904 }
  1905 
  1906 int
  1907 SDL_SetTextureBlendMode(SDL_TextureID textureID, int blendMode)
  1908 {
  1909     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1910     SDL_Renderer *renderer;
  1911 
  1912     if (!texture) {
  1913         return -1;
  1914     }
  1915     renderer = texture->renderer;
  1916     if (!renderer->SetTextureBlendMode) {
  1917         SDL_Unsupported();
  1918         return -1;
  1919     }
  1920     texture->blendMode = blendMode;
  1921     return renderer->SetTextureBlendMode(renderer, texture);
  1922 }
  1923 
  1924 int
  1925 SDL_GetTextureBlendMode(SDL_TextureID textureID, int *blendMode)
  1926 {
  1927     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1928 
  1929     if (!texture) {
  1930         return -1;
  1931     }
  1932     if (blendMode) {
  1933         *blendMode = texture->blendMode;
  1934     }
  1935     return 0;
  1936 }
  1937 
  1938 int
  1939 SDL_SetTextureScaleMode(SDL_TextureID textureID, int scaleMode)
  1940 {
  1941     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1942     SDL_Renderer *renderer;
  1943 
  1944     if (!texture) {
  1945         return -1;
  1946     }
  1947     renderer = texture->renderer;
  1948     if (!renderer->SetTextureScaleMode) {
  1949         SDL_Unsupported();
  1950         return -1;
  1951     }
  1952     texture->scaleMode = scaleMode;
  1953     return renderer->SetTextureScaleMode(renderer, texture);
  1954 }
  1955 
  1956 int
  1957 SDL_GetTextureScaleMode(SDL_TextureID textureID, int *scaleMode)
  1958 {
  1959     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1960 
  1961     if (!texture) {
  1962         return -1;
  1963     }
  1964     if (scaleMode) {
  1965         *scaleMode = texture->scaleMode;
  1966     }
  1967     return 0;
  1968 }
  1969 
  1970 int
  1971 SDL_UpdateTexture(SDL_TextureID textureID, const SDL_Rect * rect,
  1972                   const void *pixels, int pitch)
  1973 {
  1974     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1975     SDL_Renderer *renderer;
  1976     SDL_Rect full_rect;
  1977 
  1978     if (!texture) {
  1979         return -1;
  1980     }
  1981     renderer = texture->renderer;
  1982     if (!renderer->UpdateTexture) {
  1983         SDL_Unsupported();
  1984         return -1;
  1985     }
  1986     if (!rect) {
  1987         full_rect.x = 0;
  1988         full_rect.y = 0;
  1989         full_rect.w = texture->w;
  1990         full_rect.h = texture->h;
  1991         rect = &full_rect;
  1992     }
  1993     return renderer->UpdateTexture(renderer, texture, rect, pixels, pitch);
  1994 }
  1995 
  1996 int
  1997 SDL_LockTexture(SDL_TextureID textureID, const SDL_Rect * rect, int markDirty,
  1998                 void **pixels, int *pitch)
  1999 {
  2000     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2001     SDL_Renderer *renderer;
  2002     SDL_Rect full_rect;
  2003 
  2004     if (!texture) {
  2005         return -1;
  2006     }
  2007     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  2008         SDL_SetError("SDL_LockTexture(): texture must be streaming");
  2009         return -1;
  2010     }
  2011     renderer = texture->renderer;
  2012     if (!renderer->LockTexture) {
  2013         SDL_Unsupported();
  2014         return -1;
  2015     }
  2016     if (!rect) {
  2017         full_rect.x = 0;
  2018         full_rect.y = 0;
  2019         full_rect.w = texture->w;
  2020         full_rect.h = texture->h;
  2021         rect = &full_rect;
  2022     }
  2023     return renderer->LockTexture(renderer, texture, rect, markDirty, pixels,
  2024                                  pitch);
  2025 }
  2026 
  2027 void
  2028 SDL_UnlockTexture(SDL_TextureID textureID)
  2029 {
  2030     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2031     SDL_Renderer *renderer;
  2032 
  2033     if (!texture) {
  2034         return;
  2035     }
  2036     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  2037         return;
  2038     }
  2039     renderer = texture->renderer;
  2040     if (!renderer->UnlockTexture) {
  2041         return;
  2042     }
  2043     renderer->UnlockTexture(renderer, texture);
  2044 }
  2045 
  2046 void
  2047 SDL_DirtyTexture(SDL_TextureID textureID, int numrects,
  2048                  const SDL_Rect * rects)
  2049 {
  2050     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2051     SDL_Renderer *renderer;
  2052 
  2053     if (!texture) {
  2054         return;
  2055     }
  2056     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  2057         return;
  2058     }
  2059     renderer = texture->renderer;
  2060     if (!renderer->DirtyTexture) {
  2061         return;
  2062     }
  2063     renderer->DirtyTexture(renderer, texture, numrects, rects);
  2064 }
  2065 
  2066 int
  2067 SDL_SetRenderDrawColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a)
  2068 {
  2069     SDL_Renderer *renderer;
  2070 
  2071     if (!_this) {
  2072         SDL_UninitializedVideo();
  2073         return -1;
  2074     }
  2075     renderer = SDL_CurrentDisplay.current_renderer;
  2076     if (!renderer) {
  2077         return -1;
  2078     }
  2079     renderer->r = r;
  2080     renderer->g = g;
  2081     renderer->b = b;
  2082     renderer->a = a;
  2083     if (renderer->SetDrawColor) {
  2084         return renderer->SetDrawColor(renderer);
  2085     } else {
  2086         return 0;
  2087     }
  2088 }
  2089 
  2090 int
  2091 SDL_GetRenderDrawColor(Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a)
  2092 {
  2093     SDL_Renderer *renderer;
  2094 
  2095     if (!_this) {
  2096         SDL_UninitializedVideo();
  2097         return -1;
  2098     }
  2099     renderer = SDL_CurrentDisplay.current_renderer;
  2100     if (!renderer) {
  2101         return -1;
  2102     }
  2103     if (r) {
  2104         *r = renderer->r;
  2105     }
  2106     if (g) {
  2107         *g = renderer->g;
  2108     }
  2109     if (b) {
  2110         *b = renderer->b;
  2111     }
  2112     if (a) {
  2113         *a = renderer->a;
  2114     }
  2115     return 0;
  2116 }
  2117 
  2118 int
  2119 SDL_SetRenderDrawBlendMode(int blendMode)
  2120 {
  2121     SDL_Renderer *renderer;
  2122 
  2123     if (!_this) {
  2124         SDL_UninitializedVideo();
  2125         return -1;
  2126     }
  2127     renderer = SDL_CurrentDisplay.current_renderer;
  2128     if (!renderer) {
  2129         return -1;
  2130     }
  2131     renderer->blendMode = blendMode;
  2132     if (renderer->SetDrawBlendMode) {
  2133         return renderer->SetDrawBlendMode(renderer);
  2134     } else {
  2135         return 0;
  2136     }
  2137 }
  2138 
  2139 int
  2140 SDL_GetRenderDrawBlendMode(int *blendMode)
  2141 {
  2142     SDL_Renderer *renderer;
  2143 
  2144     if (!_this) {
  2145         SDL_UninitializedVideo();
  2146         return -1;
  2147     }
  2148     renderer = SDL_CurrentDisplay.current_renderer;
  2149     if (!renderer) {
  2150         return -1;
  2151     }
  2152     *blendMode = renderer->blendMode;
  2153     return 0;
  2154 }
  2155 
  2156 int
  2157 SDL_RenderPoint(int x, int y)
  2158 {
  2159     SDL_Renderer *renderer;
  2160     SDL_Window *window;
  2161 
  2162     if (!_this) {
  2163         SDL_UninitializedVideo();
  2164         return -1;
  2165     }
  2166     renderer = SDL_CurrentDisplay.current_renderer;
  2167     if (!renderer) {
  2168         return -1;
  2169     }
  2170     if (!renderer->RenderPoint) {
  2171         SDL_Unsupported();
  2172         return -1;
  2173     }
  2174     window = SDL_GetWindowFromID(renderer->window);
  2175     if (x < 0 || y < 0 || x >= window->w || y >= window->h) {
  2176         return 0;
  2177     }
  2178     return renderer->RenderPoint(renderer, x, y);
  2179 }
  2180 
  2181 int
  2182 SDL_RenderLine(int x1, int y1, int x2, int y2)
  2183 {
  2184     SDL_Renderer *renderer;
  2185     SDL_Window *window;
  2186     SDL_Rect real_rect;
  2187 
  2188     if (x1 == x2 && y1 == y2) {
  2189         return SDL_RenderPoint(x1, y1);
  2190     }
  2191 
  2192     if (!_this) {
  2193         SDL_UninitializedVideo();
  2194         return -1;
  2195     }
  2196     renderer = SDL_CurrentDisplay.current_renderer;
  2197     if (!renderer) {
  2198         return -1;
  2199     }
  2200     if (!renderer->RenderLine) {
  2201         SDL_Unsupported();
  2202         return -1;
  2203     }
  2204     window = SDL_GetWindowFromID(renderer->window);
  2205 
  2206     real_rect.x = 0;
  2207     real_rect.y = 0;
  2208     real_rect.w = window->w;
  2209     real_rect.h = window->h;
  2210     if (!SDL_IntersectRectAndLine(&real_rect, &x1, &y1, &x2, &y2)) {
  2211         return (0);
  2212     }
  2213     return renderer->RenderLine(renderer, x1, y1, x2, y2);
  2214 }
  2215 
  2216 int
  2217 SDL_RenderFill(const SDL_Rect * rect)
  2218 {
  2219     SDL_Renderer *renderer;
  2220     SDL_Window *window;
  2221     SDL_Rect real_rect;
  2222 
  2223     if (!_this) {
  2224         SDL_UninitializedVideo();
  2225         return -1;
  2226     }
  2227     renderer = SDL_CurrentDisplay.current_renderer;
  2228     if (!renderer) {
  2229         return -1;
  2230     }
  2231     if (!renderer->RenderFill) {
  2232         SDL_Unsupported();
  2233         return -1;
  2234     }
  2235     window = SDL_GetWindowFromID(renderer->window);
  2236 
  2237     real_rect.x = 0;
  2238     real_rect.y = 0;
  2239     real_rect.w = window->w;
  2240     real_rect.h = window->h;
  2241     if (rect) {
  2242         if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
  2243             return 0;
  2244         }
  2245     }
  2246     return renderer->RenderFill(renderer, &real_rect);
  2247 }
  2248 
  2249 int
  2250 SDL_RenderCopy(SDL_TextureID textureID, const SDL_Rect * srcrect,
  2251                const SDL_Rect * dstrect)
  2252 {
  2253     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2254     SDL_Renderer *renderer;
  2255     SDL_Window *window;
  2256     SDL_Rect real_srcrect;
  2257     SDL_Rect real_dstrect;
  2258 
  2259     if (!texture || texture->renderer != SDL_CurrentDisplay.current_renderer) {
  2260         return -1;
  2261     }
  2262     renderer = SDL_CurrentDisplay.current_renderer;
  2263     if (!renderer) {
  2264         return -1;
  2265     }
  2266     if (!renderer->RenderCopy) {
  2267         SDL_Unsupported();
  2268         return -1;
  2269     }
  2270     window = SDL_GetWindowFromID(renderer->window);
  2271 
  2272     real_srcrect.x = 0;
  2273     real_srcrect.y = 0;
  2274     real_srcrect.w = texture->w;
  2275     real_srcrect.h = texture->h;
  2276     if (srcrect) {
  2277         if (!SDL_IntersectRect(srcrect, &real_srcrect, &real_srcrect)) {
  2278             return 0;
  2279         }
  2280     }
  2281 
  2282     real_dstrect.x = 0;
  2283     real_dstrect.y = 0;
  2284     real_dstrect.w = window->w;
  2285     real_dstrect.h = window->h;
  2286     if (dstrect) {
  2287         if (!SDL_IntersectRect(dstrect, &real_dstrect, &real_dstrect)) {
  2288             return 0;
  2289         }
  2290         /* Clip srcrect by the same amount as dstrect was clipped */
  2291         if (dstrect->w != real_dstrect.w) {
  2292             int deltax = (real_dstrect.x - dstrect->x);
  2293             int deltaw = (real_dstrect.w - dstrect->w);
  2294             real_srcrect.x += (deltax * dstrect->w) / real_srcrect.w;
  2295             real_srcrect.w += (deltaw * dstrect->w) / real_srcrect.w;
  2296         }
  2297         if (dstrect->h != real_dstrect.h) {
  2298             int deltay = (real_dstrect.y - dstrect->y);
  2299             int deltah = (real_dstrect.h - dstrect->h);
  2300             real_srcrect.y += (deltay * dstrect->h) / real_srcrect.h;
  2301             real_srcrect.h += (deltah * dstrect->h) / real_srcrect.h;
  2302         }
  2303     }
  2304 
  2305     return renderer->RenderCopy(renderer, texture, &real_srcrect,
  2306                                 &real_dstrect);
  2307 }
  2308 
  2309 void
  2310 SDL_RenderPresent(void)
  2311 {
  2312     SDL_Renderer *renderer;
  2313 
  2314     if (!_this) {
  2315         SDL_UninitializedVideo();
  2316         return;
  2317     }
  2318     renderer = SDL_CurrentDisplay.current_renderer;
  2319     if (!renderer || !renderer->RenderPresent) {
  2320         return;
  2321     }
  2322     renderer->RenderPresent(renderer);
  2323 }
  2324 
  2325 void
  2326 SDL_DestroyTexture(SDL_TextureID textureID)
  2327 {
  2328     int hash;
  2329     SDL_Texture *prev, *texture;
  2330     SDL_Renderer *renderer;
  2331 
  2332     if (!_this) {
  2333         SDL_UninitializedVideo();
  2334         return;
  2335     }
  2336     /* Look up the texture in the hash table */
  2337     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  2338     prev = NULL;
  2339     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  2340          prev = texture, texture = texture->next) {
  2341         if (texture->id == textureID) {
  2342             break;
  2343         }
  2344     }
  2345     if (!texture) {
  2346         return;
  2347     }
  2348     /* Unlink the texture from the list */
  2349     if (prev) {
  2350         prev->next = texture->next;
  2351     } else {
  2352         SDL_CurrentDisplay.textures[hash] = texture->next;
  2353     }
  2354 
  2355     /* Free the texture */
  2356     renderer = texture->renderer;
  2357     renderer->DestroyTexture(renderer, texture);
  2358     SDL_free(texture);
  2359 }
  2360 
  2361 void
  2362 SDL_DestroyRenderer(SDL_WindowID windowID)
  2363 {
  2364     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2365     SDL_Renderer *renderer;
  2366     int i;
  2367 
  2368     if (!window) {
  2369         return;
  2370     }
  2371     renderer = window->renderer;
  2372     if (!renderer) {
  2373         return;
  2374     }
  2375     /* Free existing textures for this renderer */
  2376     for (i = 0; i < SDL_arraysize(SDL_CurrentDisplay.textures); ++i) {
  2377         SDL_Texture *texture;
  2378         SDL_Texture *prev = NULL;
  2379         SDL_Texture *next;
  2380         for (texture = SDL_CurrentDisplay.textures[i]; texture;
  2381              texture = next) {
  2382             next = texture->next;
  2383             if (texture->renderer == renderer) {
  2384                 if (prev) {
  2385                     prev->next = next;
  2386                 } else {
  2387                     SDL_CurrentDisplay.textures[i] = next;
  2388                 }
  2389                 renderer->DestroyTexture(renderer, texture);
  2390                 SDL_free(texture);
  2391             } else {
  2392                 prev = texture;
  2393             }
  2394         }
  2395     }
  2396 
  2397     /* Free the renderer instance */
  2398     renderer->DestroyRenderer(renderer);
  2399 
  2400     /* Clear references */
  2401     window->renderer = NULL;
  2402     if (SDL_CurrentDisplay.current_renderer == renderer) {
  2403         SDL_CurrentDisplay.current_renderer = NULL;
  2404     }
  2405 }
  2406 
  2407 SDL_bool
  2408 SDL_IsScreenSaverEnabled()
  2409 {
  2410     if (!_this) {
  2411         return SDL_TRUE;
  2412     }
  2413     return _this->suspend_screensaver ? SDL_FALSE : SDL_TRUE;
  2414 }
  2415 
  2416 void
  2417 SDL_EnableScreenSaver()
  2418 {
  2419     if (!_this) {
  2420         return;
  2421     }
  2422     if (!_this->suspend_screensaver) {
  2423         return;
  2424     }
  2425     _this->suspend_screensaver = SDL_FALSE;
  2426     if (_this->SuspendScreenSaver) {
  2427         _this->SuspendScreenSaver(_this);
  2428     }
  2429 }
  2430 
  2431 void
  2432 SDL_DisableScreenSaver()
  2433 {
  2434     if (!_this) {
  2435         return;
  2436     }
  2437     if (_this->suspend_screensaver) {
  2438         return;
  2439     }
  2440     _this->suspend_screensaver = SDL_TRUE;
  2441     if (_this->SuspendScreenSaver) {
  2442         _this->SuspendScreenSaver(_this);
  2443     }
  2444 }
  2445 
  2446 void
  2447 SDL_VideoQuit(void)
  2448 {
  2449     int i, j;
  2450 
  2451     if (!_this) {
  2452         return;
  2453     }
  2454     /* Halt event processing before doing anything else */
  2455     SDL_StopEventLoop();
  2456     SDL_EnableScreenSaver();
  2457 
  2458     /* Clean up the system video */
  2459     for (i = _this->num_displays; i--;) {
  2460         SDL_VideoDisplay *display = &_this->displays[i];
  2461         for (j = display->num_windows; j--;) {
  2462             SDL_DestroyWindow(display->windows[i].id);
  2463         }
  2464         if (display->windows) {
  2465             SDL_free(display->windows);
  2466             display->windows = NULL;
  2467         }
  2468         display->num_windows = 0;
  2469         if (display->render_drivers) {
  2470             SDL_free(display->render_drivers);
  2471             display->render_drivers = NULL;
  2472         }
  2473         display->num_render_drivers = 0;
  2474     }
  2475     _this->VideoQuit(_this);
  2476 
  2477     for (i = _this->num_displays; i--;) {
  2478         SDL_VideoDisplay *display = &_this->displays[i];
  2479         for (j = display->num_display_modes; j--;) {
  2480             if (display->display_modes[j].driverdata) {
  2481                 SDL_free(display->display_modes[j].driverdata);
  2482                 display->display_modes[j].driverdata = NULL;
  2483             }
  2484         }
  2485         if (display->display_modes) {
  2486             SDL_free(display->display_modes);
  2487             display->display_modes = NULL;
  2488         }
  2489         if (display->desktop_mode.driverdata) {
  2490             SDL_free(display->desktop_mode.driverdata);
  2491             display->desktop_mode.driverdata = NULL;
  2492         }
  2493         if (display->palette) {
  2494             SDL_FreePalette(display->palette);
  2495             display->palette = NULL;
  2496         }
  2497         if (display->gamma) {
  2498             SDL_free(display->gamma);
  2499             display->gamma = NULL;
  2500         }
  2501         if (display->driverdata) {
  2502             SDL_free(display->driverdata);
  2503             display->driverdata = NULL;
  2504         }
  2505     }
  2506     if (_this->displays) {
  2507         SDL_free(_this->displays);
  2508         _this->displays = NULL;
  2509     }
  2510     _this->free(_this);
  2511     _this = NULL;
  2512 }
  2513 
  2514 int
  2515 SDL_GL_LoadLibrary(const char *path)
  2516 {
  2517     int retval;
  2518 
  2519     if (!_this) {
  2520         SDL_UninitializedVideo();
  2521         return -1;
  2522     }
  2523     if (_this->gl_config.driver_loaded) {
  2524         if (path && SDL_strcmp(path, _this->gl_config.driver_path) != 0) {
  2525             SDL_SetError("OpenGL library already loaded");
  2526             return -1;
  2527         }
  2528         retval = 0;
  2529     } else {
  2530         if (!_this->GL_LoadLibrary) {
  2531             SDL_SetError("No dynamic GL support in video driver");
  2532             return -1;
  2533         }
  2534         retval = _this->GL_LoadLibrary(_this, path);
  2535     }
  2536     if (retval == 0) {
  2537         ++_this->gl_config.driver_loaded;
  2538     }
  2539     return (retval);
  2540 }
  2541 
  2542 void *
  2543 SDL_GL_GetProcAddress(const char *proc)
  2544 {
  2545     void *func;
  2546 
  2547     if (!_this) {
  2548         SDL_UninitializedVideo();
  2549         return NULL;
  2550     }
  2551     func = NULL;
  2552     if (_this->GL_GetProcAddress) {
  2553         if (_this->gl_config.driver_loaded) {
  2554             func = _this->GL_GetProcAddress(_this, proc);
  2555         } else {
  2556             SDL_SetError("No GL driver has been loaded");
  2557         }
  2558     } else {
  2559         SDL_SetError("No dynamic GL support in video driver");
  2560     }
  2561     return func;
  2562 }
  2563 
  2564 void
  2565 SDL_GL_UnloadLibrary(void)
  2566 {
  2567     if (!_this) {
  2568         SDL_UninitializedVideo();
  2569         return;
  2570     }
  2571     if (_this->gl_config.driver_loaded > 0) {
  2572         if (--_this->gl_config.driver_loaded > 0) {
  2573             return;
  2574         }
  2575         if (_this->GL_UnloadLibrary) {
  2576             _this->GL_UnloadLibrary(_this);
  2577         }
  2578     }
  2579 }
  2580 
  2581 SDL_bool
  2582 SDL_GL_ExtensionSupported(const char *extension)
  2583 {
  2584 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2585     const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
  2586     const char *extensions;
  2587     const char *start;
  2588     const char *where, *terminator;
  2589 
  2590     /* Extension names should not have spaces. */
  2591     where = SDL_strchr(extension, ' ');
  2592     if (where || *extension == '\0') {
  2593         return SDL_FALSE;
  2594     }
  2595     /* See if there's an environment variable override */
  2596     start = SDL_getenv(extension);
  2597     if (start && *start == '0') {
  2598         return SDL_FALSE;
  2599     }
  2600     /* Lookup the available extensions */
  2601     glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
  2602     if (glGetStringFunc) {
  2603         extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
  2604     } else {
  2605         extensions = NULL;
  2606     }
  2607     if (!extensions) {
  2608         return SDL_FALSE;
  2609     }
  2610     /*
  2611      * It takes a bit of care to be fool-proof about parsing the OpenGL
  2612      * extensions string. Don't be fooled by sub-strings, etc.
  2613      */
  2614 
  2615     start = extensions;
  2616 
  2617     for (;;) {
  2618         where = SDL_strstr(start, extension);
  2619         if (!where)
  2620             break;
  2621 
  2622         terminator = where + SDL_strlen(extension);
  2623         if (where == start || *(where - 1) == ' ')
  2624             if (*terminator == ' ' || *terminator == '\0')
  2625                 return SDL_TRUE;
  2626 
  2627         start = terminator;
  2628     }
  2629     return SDL_FALSE;
  2630 #else
  2631     return SDL_FALSE;
  2632 #endif
  2633 }
  2634 
  2635 int
  2636 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
  2637 {
  2638 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2639     int retval;
  2640 
  2641     if (!_this) {
  2642         SDL_UninitializedVideo();
  2643         return -1;
  2644     }
  2645     retval = 0;
  2646     switch (attr) {
  2647     case SDL_GL_RED_SIZE:
  2648         _this->gl_config.red_size = value;
  2649         break;
  2650     case SDL_GL_GREEN_SIZE:
  2651         _this->gl_config.green_size = value;
  2652         break;
  2653     case SDL_GL_BLUE_SIZE:
  2654         _this->gl_config.blue_size = value;
  2655         break;
  2656     case SDL_GL_ALPHA_SIZE:
  2657         _this->gl_config.alpha_size = value;
  2658         break;
  2659     case SDL_GL_DOUBLEBUFFER:
  2660         _this->gl_config.double_buffer = value;
  2661         break;
  2662     case SDL_GL_BUFFER_SIZE:
  2663         _this->gl_config.buffer_size = value;
  2664         break;
  2665     case SDL_GL_DEPTH_SIZE:
  2666         _this->gl_config.depth_size = value;
  2667         break;
  2668     case SDL_GL_STENCIL_SIZE:
  2669         _this->gl_config.stencil_size = value;
  2670         break;
  2671     case SDL_GL_ACCUM_RED_SIZE:
  2672         _this->gl_config.accum_red_size = value;
  2673         break;
  2674     case SDL_GL_ACCUM_GREEN_SIZE:
  2675         _this->gl_config.accum_green_size = value;
  2676         break;
  2677     case SDL_GL_ACCUM_BLUE_SIZE:
  2678         _this->gl_config.accum_blue_size = value;
  2679         break;
  2680     case SDL_GL_ACCUM_ALPHA_SIZE:
  2681         _this->gl_config.accum_alpha_size = value;
  2682         break;
  2683     case SDL_GL_STEREO:
  2684         _this->gl_config.stereo = value;
  2685         break;
  2686     case SDL_GL_MULTISAMPLEBUFFERS:
  2687         _this->gl_config.multisamplebuffers = value;
  2688         break;
  2689     case SDL_GL_MULTISAMPLESAMPLES:
  2690         _this->gl_config.multisamplesamples = value;
  2691         break;
  2692     case SDL_GL_ACCELERATED_VISUAL:
  2693         _this->gl_config.accelerated = value;
  2694         break;
  2695     case SDL_GL_RETAINED_BACKING:
  2696         _this->gl_config.retained_backing = value;
  2697         break;
  2698     case SDL_GL_CONTEXT_MAJOR_VERSION:
  2699         _this->gl_config.major_version = value;
  2700         break;
  2701     case SDL_GL_CONTEXT_MINOR_VERSION:
  2702         _this->gl_config.minor_version = value;
  2703         break;
  2704     default:
  2705         SDL_SetError("Unknown OpenGL attribute");
  2706         retval = -1;
  2707         break;
  2708     }
  2709     return retval;
  2710 #else
  2711     SDL_Unsupported();
  2712     return -1;
  2713 #endif /* SDL_VIDEO_OPENGL */
  2714 }
  2715 
  2716 int
  2717 SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
  2718 {
  2719 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2720     void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2721     GLenum(APIENTRY * glGetErrorFunc) (void);
  2722     GLenum attrib = 0;
  2723     GLenum error = 0;
  2724 
  2725     glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2726     if (!glGetIntegervFunc) {
  2727         return -1;
  2728     }
  2729 
  2730     glGetErrorFunc = SDL_GL_GetProcAddress("glGetError");
  2731     if (!glGetErrorFunc) {
  2732         return -1;
  2733     }
  2734 
  2735     /* Clear value in any case */
  2736     *value = 0;
  2737 
  2738     switch (attr) {
  2739     case SDL_GL_RETAINED_BACKING:
  2740         *value = _this->gl_config.retained_backing;
  2741         return 0;
  2742     case SDL_GL_RED_SIZE:
  2743         attrib = GL_RED_BITS;
  2744         break;
  2745     case SDL_GL_BLUE_SIZE:
  2746         attrib = GL_BLUE_BITS;
  2747         break;
  2748     case SDL_GL_GREEN_SIZE:
  2749         attrib = GL_GREEN_BITS;
  2750         break;
  2751     case SDL_GL_ALPHA_SIZE:
  2752         attrib = GL_ALPHA_BITS;
  2753         break;
  2754     case SDL_GL_DOUBLEBUFFER:
  2755 #ifndef SDL_VIDEO_OPENGL_ES
  2756         attrib = GL_DOUBLEBUFFER;
  2757         break;
  2758 #else
  2759         /* OpenGL ES 1.0 and above specifications have EGL_SINGLE_BUFFER      */
  2760         /* parameter which switches double buffer to single buffer. OpenGL ES */
  2761         /* SDL driver must set proper value after initialization              */
  2762         *value = _this->gl_config.double_buffer;
  2763         return 0;
  2764 #endif
  2765     case SDL_GL_DEPTH_SIZE:
  2766         attrib = GL_DEPTH_BITS;
  2767         break;
  2768     case SDL_GL_STENCIL_SIZE:
  2769         attrib = GL_STENCIL_BITS;
  2770         break;
  2771 #ifndef SDL_VIDEO_OPENGL_ES
  2772     case SDL_GL_ACCUM_RED_SIZE:
  2773         attrib = GL_ACCUM_RED_BITS;
  2774         break;
  2775     case SDL_GL_ACCUM_GREEN_SIZE:
  2776         attrib = GL_ACCUM_GREEN_BITS;
  2777         break;
  2778     case SDL_GL_ACCUM_BLUE_SIZE:
  2779         attrib = GL_ACCUM_BLUE_BITS;
  2780         break;
  2781     case SDL_GL_ACCUM_ALPHA_SIZE:
  2782         attrib = GL_ACCUM_ALPHA_BITS;
  2783         break;
  2784     case SDL_GL_STEREO:
  2785         attrib = GL_STEREO;
  2786         break;
  2787 #else
  2788     case SDL_GL_ACCUM_RED_SIZE:
  2789     case SDL_GL_ACCUM_GREEN_SIZE:
  2790     case SDL_GL_ACCUM_BLUE_SIZE:
  2791     case SDL_GL_ACCUM_ALPHA_SIZE:
  2792     case SDL_GL_STEREO:
  2793         /* none of these are supported in OpenGL ES */
  2794         *value = 0;
  2795         return 0;
  2796 #endif
  2797     case SDL_GL_MULTISAMPLEBUFFERS:
  2798 #ifndef SDL_VIDEO_OPENGL_ES
  2799         attrib = GL_SAMPLE_BUFFERS_ARB;
  2800 #else
  2801         attrib = GL_SAMPLE_BUFFERS;
  2802 #endif
  2803         break;
  2804     case SDL_GL_MULTISAMPLESAMPLES:
  2805 #ifndef SDL_VIDEO_OPENGL_ES
  2806         attrib = GL_SAMPLES_ARB;
  2807 #else
  2808         attrib = GL_SAMPLES;
  2809 #endif
  2810         break;
  2811     case SDL_GL_BUFFER_SIZE:
  2812         {
  2813             GLint bits = 0;
  2814             GLint component;
  2815 
  2816             /*
  2817              * there doesn't seem to be a single flag in OpenGL
  2818              * for this!
  2819              */
  2820             glGetIntegervFunc(GL_RED_BITS, &component);
  2821             bits += component;
  2822             glGetIntegervFunc(GL_GREEN_BITS, &component);
  2823             bits += component;
  2824             glGetIntegervFunc(GL_BLUE_BITS, &component);
  2825             bits += component;
  2826             glGetIntegervFunc(GL_ALPHA_BITS, &component);
  2827             bits += component;
  2828 
  2829             *value = bits;
  2830             return 0;
  2831         }
  2832     case SDL_GL_ACCELERATED_VISUAL:
  2833         {
  2834             /* FIXME: How do we get this information? */
  2835             *value = (_this->gl_config.accelerated != 0);
  2836             return 0;
  2837         }
  2838     default:
  2839         SDL_SetError("Unknown OpenGL attribute");
  2840         return -1;
  2841     }
  2842 
  2843     glGetIntegervFunc(attrib, (GLint *) value);
  2844     error = glGetErrorFunc();
  2845     if (error != GL_NO_ERROR) {
  2846         switch (error) {
  2847         case GL_INVALID_ENUM:
  2848             {
  2849                 SDL_SetError("OpenGL error: GL_INVALID_ENUM");
  2850             }
  2851             break;
  2852         case GL_INVALID_VALUE:
  2853             {
  2854                 SDL_SetError("OpenGL error: GL_INVALID_VALUE");
  2855             }
  2856             break;
  2857         default:
  2858             {
  2859                 SDL_SetError("OpenGL error: %08X", error);
  2860             }
  2861             break;
  2862         }
  2863         return -1;
  2864     }
  2865     return 0;
  2866 #else
  2867     SDL_Unsupported();
  2868     return -1;
  2869 #endif /* SDL_VIDEO_OPENGL */
  2870 }
  2871 
  2872 SDL_GLContext
  2873 SDL_GL_CreateContext(SDL_WindowID windowID)
  2874 {
  2875     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2876 
  2877     if (!window) {
  2878         return NULL;
  2879     }
  2880     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2881         SDL_SetError("The specified window isn't an OpenGL window");
  2882         return NULL;
  2883     }
  2884     return _this->GL_CreateContext(_this, window);
  2885 }
  2886 
  2887 int
  2888 SDL_GL_MakeCurrent(SDL_WindowID windowID, SDL_GLContext context)
  2889 {
  2890     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2891 
  2892     if (window && !(window->flags & SDL_WINDOW_OPENGL)) {
  2893         SDL_SetError("The specified window isn't an OpenGL window");
  2894         return -1;
  2895     }
  2896     if (!context) {
  2897         window = NULL;
  2898     }
  2899     return _this->GL_MakeCurrent(_this, window, context);
  2900 }
  2901 
  2902 int
  2903 SDL_GL_SetSwapInterval(int interval)
  2904 {
  2905     if (!_this) {
  2906         SDL_UninitializedVideo();
  2907         return -1;
  2908     }
  2909     if (_this->GL_SetSwapInterval) {
  2910         return _this->GL_SetSwapInterval(_this, interval);
  2911     } else {
  2912         SDL_SetError("Setting the swap interval is not supported");
  2913         return -1;
  2914     }
  2915 }
  2916 
  2917 int
  2918 SDL_GL_GetSwapInterval(void)
  2919 {
  2920     if (!_this) {
  2921         SDL_UninitializedVideo();
  2922         return -1;
  2923     }
  2924     if (_this->GL_GetSwapInterval) {
  2925         return _this->GL_GetSwapInterval(_this);
  2926     } else {
  2927         SDL_SetError("Getting the swap interval is not supported");
  2928         return -1;
  2929     }
  2930 }
  2931 
  2932 void
  2933 SDL_GL_SwapWindow(SDL_WindowID windowID)
  2934 {
  2935     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2936 
  2937     if (!window) {
  2938         return;
  2939     }
  2940     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2941         SDL_SetError("The specified window isn't an OpenGL window");
  2942         return;
  2943     }
  2944     _this->GL_SwapWindow(_this, window);
  2945 }
  2946 
  2947 void
  2948 SDL_GL_DeleteContext(SDL_GLContext context)
  2949 {
  2950     if (!_this || !context) {
  2951         return;
  2952     }
  2953     _this->GL_MakeCurrent(_this, NULL, NULL);
  2954     _this->GL_DeleteContext(_this, context);
  2955 }
  2956 
  2957 #if 0                           // FIXME
  2958 /*
  2959  * Utility function used by SDL_WM_SetIcon(); flags & 1 for color key, flags
  2960  * & 2 for alpha channel.
  2961  */
  2962 static void
  2963 CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
  2964 {
  2965     int x, y;
  2966     Uint32 colorkey;
  2967 #define SET_MASKBIT(icon, x, y, mask) \
  2968 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  2969 
  2970     colorkey = icon->format->colorkey;
  2971     switch (icon->format->BytesPerPixel) {
  2972     case 1:
  2973         {
  2974             Uint8 *pixels;
  2975             for (y = 0; y < icon->h; ++y) {
  2976                 pixels = (Uint8 *) icon->pixels + y * icon->pitch;
  2977                 for (x = 0; x < icon->w; ++x) {
  2978                     if (*pixels++ == colorkey) {
  2979                         SET_MASKBIT(icon, x, y, mask);
  2980                     }
  2981                 }
  2982             }
  2983         }
  2984         break;
  2985 
  2986     case 2:
  2987         {
  2988             Uint16 *pixels;
  2989             for (y = 0; y < icon->h; ++y) {
  2990                 pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
  2991                 for (x = 0; x < icon->w; ++x) {
  2992                     if ((flags & 1) && *pixels == colorkey) {
  2993                         SET_MASKBIT(icon, x, y, mask);
  2994                     } else if ((flags & 2)
  2995                                && (*pixels & icon->format->Amask) == 0) {
  2996                         SET_MASKBIT(icon, x, y, mask);
  2997                     }
  2998                     pixels++;
  2999                 }
  3000             }
  3001         }
  3002         break;
  3003 
  3004     case 4:
  3005         {
  3006             Uint32 *pixels;
  3007             for (y = 0; y < icon->h; ++y) {
  3008                 pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
  3009                 for (x = 0; x < icon->w; ++x) {
  3010                     if ((flags & 1) && *pixels == colorkey) {
  3011                         SET_MASKBIT(icon, x, y, mask);
  3012                     } else if ((flags & 2)
  3013                                && (*pixels & icon->format->Amask) == 0) {
  3014                         SET_MASKBIT(icon, x, y, mask);
  3015                     }
  3016                     pixels++;
  3017                 }
  3018             }
  3019         }
  3020         break;
  3021     }
  3022 }
  3023 
  3024 /*
  3025  * Sets the window manager icon for the display window.
  3026  */
  3027 void
  3028 SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
  3029 {
  3030     if (icon && _this->SetIcon) {
  3031         /* Generate a mask if necessary, and create the icon! */
  3032         if (mask == NULL) {
  3033             int mask_len = icon->h * (icon->w + 7) / 8;
  3034             int flags = 0;
  3035             mask = (Uint8 *) SDL_malloc(mask_len);
  3036             if (mask == NULL) {
  3037                 return;
  3038             }
  3039             SDL_memset(mask, ~0, mask_len);
  3040             if (icon->flags & SDL_SRCCOLORKEY)
  3041                 flags |= 1;
  3042             if (icon->flags & SDL_SRCALPHA)
  3043                 flags |= 2;
  3044             if (flags) {
  3045                 CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  3046             }
  3047             _this->SetIcon(_this, icon, mask);
  3048             SDL_free(mask);
  3049         } else {
  3050             _this->SetIcon(_this, icon, mask);
  3051         }
  3052     }
  3053 }
  3054 #endif
  3055 
  3056 SDL_bool
  3057 SDL_GetWindowWMInfo(SDL_WindowID windowID, struct SDL_SysWMinfo *info)
  3058 {
  3059     SDL_Window *window = SDL_GetWindowFromID(windowID);
  3060 
  3061     if (!window || !_this->GetWindowWMInfo) {
  3062         return SDL_FALSE;
  3063     }
  3064     return (_this->GetWindowWMInfo(_this, window, info));
  3065 }
  3066 
  3067 /* vi: set ts=4 sw=4 expandtab: */