src/video/SDL_video.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 08 Nov 2009 04:16:42 +0000
changeset 3424 032e64bbb56c
parent 3417 64a60c5d502e
child 3425 25ccea045c9f
permissions -rw-r--r--
Skip renderers that fail to initialize
     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_FBCON
    59     &FBCON_bootstrap,
    60 #endif
    61 #if SDL_VIDEO_DRIVER_DIRECTFB
    62     &DirectFB_bootstrap,
    63 #endif
    64 #if SDL_VIDEO_DRIVER_PS2GS
    65     &PS2GS_bootstrap,
    66 #endif
    67 #if SDL_VIDEO_DRIVER_PS3
    68     &PS3_bootstrap,
    69 #endif
    70 #if SDL_VIDEO_DRIVER_SVGALIB
    71     &SVGALIB_bootstrap,
    72 #endif
    73 #if SDL_VIDEO_DRIVER_GAPI
    74     &GAPI_bootstrap,
    75 #endif
    76 #if SDL_VIDEO_DRIVER_WIN32
    77     &WIN32_bootstrap,
    78 #endif
    79 #if SDL_VIDEO_DRIVER_BWINDOW
    80     &BWINDOW_bootstrap,
    81 #endif
    82 #if SDL_VIDEO_DRIVER_PHOTON
    83     &photon_bootstrap,
    84 #endif
    85 #if SDL_VIDEO_DRIVER_QNXGF
    86     &qnxgf_bootstrap,
    87 #endif
    88 #if SDL_VIDEO_DRIVER_EPOC
    89     &EPOC_bootstrap,
    90 #endif
    91 #if SDL_VIDEO_DRIVER_RISCOS
    92     &RISCOS_bootstrap,
    93 #endif
    94 #if SDL_VIDEO_DRIVER_NDS
    95     &NDS_bootstrap,
    96 #endif
    97 #if SDL_VIDEO_DRIVER_UIKIT
    98     &UIKIT_bootstrap,
    99 #endif
   100 #if SDL_VIDEO_DRIVER_DUMMY
   101     &DUMMY_bootstrap,
   102 #endif
   103 #if SDL_VIDEO_DRIVER_PANDORA
   104     &PND_bootstrap,
   105 #endif
   106     NULL
   107 };
   108 
   109 static SDL_VideoDevice *_this = NULL;
   110 
   111 /* Various local functions */
   112 static void SDL_UpdateWindowGrab(SDL_Window * window);
   113 
   114 static int
   115 cmpmodes(const void *A, const void *B)
   116 {
   117     SDL_DisplayMode a = *(const SDL_DisplayMode *) A;
   118     SDL_DisplayMode b = *(const SDL_DisplayMode *) B;
   119 
   120     if (a.w != b.w) {
   121         return b.w - a.w;
   122     }
   123     if (a.h != b.h) {
   124         return b.h - a.h;
   125     }
   126     if (SDL_BITSPERPIXEL(a.format) != SDL_BITSPERPIXEL(b.format)) {
   127         return SDL_BITSPERPIXEL(b.format) - SDL_BITSPERPIXEL(a.format);
   128     }
   129     if (SDL_PIXELLAYOUT(a.format) != SDL_PIXELLAYOUT(b.format)) {
   130         return SDL_PIXELLAYOUT(b.format) - SDL_PIXELLAYOUT(a.format);
   131     }
   132     if (a.refresh_rate != b.refresh_rate) {
   133         return b.refresh_rate - a.refresh_rate;
   134     }
   135     return 0;
   136 }
   137 
   138 static void
   139 SDL_UninitializedVideo()
   140 {
   141     SDL_SetError("Video subsystem has not been initialized");
   142 }
   143 
   144 int
   145 SDL_GetNumVideoDrivers(void)
   146 {
   147     return SDL_arraysize(bootstrap) - 1;
   148 }
   149 
   150 const char *
   151 SDL_GetVideoDriver(int index)
   152 {
   153     if (index >= 0 && index < SDL_GetNumVideoDrivers()) {
   154         return bootstrap[index]->name;
   155     }
   156     return NULL;
   157 }
   158 
   159 /*
   160  * Initialize the video and event subsystems -- determine native pixel format
   161  */
   162 int
   163 SDL_VideoInit(const char *driver_name, Uint32 flags)
   164 {
   165     SDL_VideoDevice *video;
   166     int index;
   167     int i;
   168 
   169     /* Toggle the event thread flags, based on OS requirements */
   170 #if defined(MUST_THREAD_EVENTS)
   171     flags |= SDL_INIT_EVENTTHREAD;
   172 #elif defined(CANT_THREAD_EVENTS)
   173     if ((flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD) {
   174         SDL_SetError("OS doesn't support threaded events");
   175         return -1;
   176     }
   177 #endif
   178 
   179     /* Start the event loop */
   180     if (SDL_StartEventLoop(flags) < 0) {
   181         return -1;
   182     }
   183     /* Check to make sure we don't overwrite '_this' */
   184     if (_this != NULL) {
   185         SDL_VideoQuit();
   186     }
   187     /* Select the proper video driver */
   188     index = 0;
   189     video = NULL;
   190     if (driver_name == NULL) {
   191         driver_name = SDL_getenv("SDL_VIDEODRIVER");
   192     }
   193     if (driver_name != NULL) {
   194         for (i = 0; bootstrap[i]; ++i) {
   195             if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) {
   196                 if (bootstrap[i]->available()) {
   197                     video = bootstrap[i]->create(index);
   198                 }
   199                 break;
   200             }
   201         }
   202     } else {
   203         for (i = 0; bootstrap[i]; ++i) {
   204             if (bootstrap[i]->available()) {
   205                 video = bootstrap[i]->create(index);
   206                 if (video != NULL) {
   207                     break;
   208                 }
   209             }
   210         }
   211     }
   212     if (video == NULL) {
   213         if (driver_name) {
   214             SDL_SetError("%s not available", driver_name);
   215         } else {
   216             SDL_SetError("No available video device");
   217         }
   218         return -1;
   219     }
   220     _this = video;
   221     _this->name = bootstrap[i]->name;
   222     _this->next_object_id = 1;
   223 
   224 
   225     /* Set some very sane GL defaults */
   226     _this->gl_config.driver_loaded = 0;
   227     _this->gl_config.dll_handle = NULL;
   228     _this->gl_config.red_size = 3;
   229     _this->gl_config.green_size = 3;
   230     _this->gl_config.blue_size = 2;
   231     _this->gl_config.alpha_size = 0;
   232     _this->gl_config.buffer_size = 0;
   233     _this->gl_config.depth_size = 16;
   234     _this->gl_config.stencil_size = 0;
   235     _this->gl_config.double_buffer = 1;
   236     _this->gl_config.accum_red_size = 0;
   237     _this->gl_config.accum_green_size = 0;
   238     _this->gl_config.accum_blue_size = 0;
   239     _this->gl_config.accum_alpha_size = 0;
   240     _this->gl_config.stereo = 0;
   241     _this->gl_config.multisamplebuffers = 0;
   242     _this->gl_config.multisamplesamples = 0;
   243     _this->gl_config.retained_backing = 1;
   244     _this->gl_config.accelerated = -1;  /* not known, don't set */
   245     _this->gl_config.major_version = 2;
   246     _this->gl_config.minor_version = 1;
   247 
   248     /* Initialize the video subsystem */
   249     if (_this->VideoInit(_this) < 0) {
   250         SDL_VideoQuit();
   251         return -1;
   252     }
   253     /* Make sure some displays were added */
   254     if (_this->num_displays == 0) {
   255         SDL_SetError("The video driver did not add any displays");
   256         SDL_VideoQuit();
   257         return (-1);
   258     }
   259     /* The software renderer is always available */
   260     for (i = 0; i < _this->num_displays; ++i) {
   261 #if SDL_VIDEO_RENDER_OGL
   262         SDL_AddRenderDriver(i, &GL_RenderDriver);
   263 #endif
   264 
   265 #if SDL_VIDEO_RENDER_OGL_ES
   266         SDL_AddRenderDriver(i, &GL_ES_RenderDriver);
   267 #endif
   268         if (_this->displays[i].num_render_drivers > 0) {
   269             SDL_AddRenderDriver(i, &SW_RenderDriver);
   270         }
   271     }
   272 
   273     /* We're ready to go! */
   274     return 0;
   275 }
   276 
   277 const char *
   278 SDL_GetCurrentVideoDriver()
   279 {
   280     if (!_this) {
   281         SDL_UninitializedVideo();
   282         return NULL;
   283     }
   284     return _this->name;
   285 }
   286 
   287 SDL_VideoDevice *
   288 SDL_GetVideoDevice()
   289 {
   290     return _this;
   291 }
   292 
   293 int
   294 SDL_AddBasicVideoDisplay(const SDL_DisplayMode * desktop_mode)
   295 {
   296     SDL_VideoDisplay display;
   297 
   298     SDL_zero(display);
   299     if (desktop_mode) {
   300         display.desktop_mode = *desktop_mode;
   301     }
   302     display.current_mode = display.desktop_mode;
   303 
   304     return SDL_AddVideoDisplay(&display);
   305 }
   306 
   307 int
   308 SDL_AddVideoDisplay(const SDL_VideoDisplay * display)
   309 {
   310     SDL_VideoDisplay *displays;
   311     int index = -1;
   312 
   313     displays =
   314         SDL_realloc(_this->displays,
   315                     (_this->num_displays + 1) * sizeof(*displays));
   316     if (displays) {
   317         index = _this->num_displays++;
   318         displays[index] = *display;
   319         displays[index].device = _this;
   320         _this->displays = displays;
   321     } else {
   322         SDL_OutOfMemory();
   323     }
   324     return index;
   325 }
   326 
   327 int
   328 SDL_GetNumVideoDisplays(void)
   329 {
   330     if (!_this) {
   331         SDL_UninitializedVideo();
   332         return 0;
   333     }
   334     return _this->num_displays;
   335 }
   336 
   337 int
   338 SDL_SelectVideoDisplay(int index)
   339 {
   340     if (!_this) {
   341         SDL_UninitializedVideo();
   342         return (-1);
   343     }
   344     if (index < 0 || index >= _this->num_displays) {
   345         SDL_SetError("index must be in the range 0 - %d",
   346                      _this->num_displays - 1);
   347         return -1;
   348     }
   349     _this->current_display = index;
   350     return 0;
   351 }
   352 
   353 int
   354 SDL_GetCurrentVideoDisplay(void)
   355 {
   356     if (!_this) {
   357         SDL_UninitializedVideo();
   358         return (-1);
   359     }
   360     return _this->current_display;
   361 }
   362 
   363 SDL_bool
   364 SDL_AddDisplayMode(int displayIndex, const SDL_DisplayMode * mode)
   365 {
   366     SDL_VideoDisplay *display = &_this->displays[displayIndex];
   367     SDL_DisplayMode *modes;
   368     int i, nmodes;
   369 
   370     /* Make sure we don't already have the mode in the list */
   371     modes = display->display_modes;
   372     nmodes = display->num_display_modes;
   373     for (i = nmodes; i--;) {
   374         if (SDL_memcmp(mode, &modes[i], sizeof(*mode)) == 0) {
   375             return SDL_FALSE;
   376         }
   377     }
   378 
   379     /* Go ahead and add the new mode */
   380     if (nmodes == display->max_display_modes) {
   381         modes =
   382             SDL_realloc(modes,
   383                         (display->max_display_modes + 32) * sizeof(*modes));
   384         if (!modes) {
   385             return SDL_FALSE;
   386         }
   387         display->display_modes = modes;
   388         display->max_display_modes += 32;
   389     }
   390     modes[nmodes] = *mode;
   391     display->num_display_modes++;
   392 
   393     /* Re-sort video modes */
   394     SDL_qsort(display->display_modes, display->num_display_modes,
   395               sizeof(SDL_DisplayMode), cmpmodes);
   396 
   397     return SDL_TRUE;
   398 }
   399 
   400 int
   401 SDL_GetNumDisplayModes()
   402 {
   403     if (_this) {
   404         SDL_VideoDisplay *display = &SDL_CurrentDisplay;
   405         if (!display->num_display_modes && _this->GetDisplayModes) {
   406             _this->GetDisplayModes(_this);
   407             SDL_qsort(display->display_modes, display->num_display_modes,
   408                       sizeof(SDL_DisplayMode), cmpmodes);
   409         }
   410         return display->num_display_modes;
   411     }
   412     return 0;
   413 }
   414 
   415 int
   416 SDL_GetDisplayMode(int index, SDL_DisplayMode * mode)
   417 {
   418     if (index < 0 || index >= SDL_GetNumDisplayModes()) {
   419         SDL_SetError("index must be in the range of 0 - %d",
   420                      SDL_GetNumDisplayModes() - 1);
   421         return -1;
   422     }
   423     if (mode) {
   424         *mode = SDL_CurrentDisplay.display_modes[index];
   425     }
   426     return 0;
   427 }
   428 
   429 int
   430 SDL_GetDesktopDisplayMode(SDL_DisplayMode * mode)
   431 {
   432     if (!_this) {
   433         SDL_UninitializedVideo();
   434         return -1;
   435     }
   436     if (mode) {
   437         *mode = SDL_CurrentDisplay.desktop_mode;
   438     }
   439     return 0;
   440 }
   441 
   442 int
   443 SDL_GetCurrentDisplayMode(SDL_DisplayMode * mode)
   444 {
   445     if (!_this) {
   446         SDL_UninitializedVideo();
   447         return -1;
   448     }
   449     if (mode) {
   450         *mode = SDL_CurrentDisplay.current_mode;
   451     }
   452     return 0;
   453 }
   454 
   455 SDL_DisplayMode *
   456 SDL_GetClosestDisplayMode(const SDL_DisplayMode * mode,
   457                           SDL_DisplayMode * closest)
   458 {
   459     Uint32 target_format;
   460     int target_refresh_rate;
   461     int i;
   462     SDL_DisplayMode *current, *match;
   463 
   464     if (!_this || !mode || !closest) {
   465         return NULL;
   466     }
   467     /* Default to the desktop format */
   468     if (mode->format) {
   469         target_format = mode->format;
   470     } else {
   471         target_format = SDL_CurrentDisplay.desktop_mode.format;
   472     }
   473 
   474     /* Default to the desktop refresh rate */
   475     if (mode->refresh_rate) {
   476         target_refresh_rate = mode->refresh_rate;
   477     } else {
   478         target_refresh_rate = SDL_CurrentDisplay.desktop_mode.refresh_rate;
   479     }
   480 
   481     match = NULL;
   482     for (i = 0; i < SDL_GetNumDisplayModes(); ++i) {
   483         current = &SDL_CurrentDisplay.display_modes[i];
   484 
   485         if (current->w && (current->w < mode->w)) {
   486             /* Out of sorted modes large enough here */
   487             break;
   488         }
   489         if (current->h && (current->h < mode->h)) {
   490             if (current->w && (current->w == mode->w)) {
   491                 /* Out of sorted modes large enough here */
   492                 break;
   493             }
   494             /* Wider, but not tall enough, due to a different
   495                aspect ratio. This mode must be skipped, but closer
   496                modes may still follow. */
   497             continue;
   498         }
   499         if (!match || current->w < match->w || current->h < match->h) {
   500             match = current;
   501             continue;
   502         }
   503         if (current->format != match->format) {
   504             /* Sorted highest depth to lowest */
   505             if (current->format == target_format ||
   506                 (SDL_BITSPERPIXEL(current->format) >=
   507                  SDL_BITSPERPIXEL(target_format)
   508                  && SDL_PIXELTYPE(current->format) ==
   509                  SDL_PIXELTYPE(target_format))) {
   510                 match = current;
   511             }
   512             continue;
   513         }
   514         if (current->refresh_rate != match->refresh_rate) {
   515             /* Sorted highest refresh to lowest */
   516             if (current->refresh_rate >= target_refresh_rate) {
   517                 match = current;
   518             }
   519         }
   520     }
   521     if (match) {
   522         if (match->format) {
   523             closest->format = match->format;
   524         } else {
   525             closest->format = mode->format;
   526         }
   527         if (match->w && match->h) {
   528             closest->w = match->w;
   529             closest->h = match->h;
   530         } else {
   531             closest->w = mode->w;
   532             closest->h = mode->h;
   533         }
   534         if (match->refresh_rate) {
   535             closest->refresh_rate = match->refresh_rate;
   536         } else {
   537             closest->refresh_rate = mode->refresh_rate;
   538         }
   539         closest->driverdata = match->driverdata;
   540 
   541         /*
   542          * Pick some reasonable defaults if the app and driver don't
   543          * care
   544          */
   545         if (!closest->format) {
   546             closest->format = SDL_PIXELFORMAT_RGB888;
   547         }
   548         if (!closest->w) {
   549             closest->w = 640;
   550         }
   551         if (!closest->h) {
   552             closest->h = 480;
   553         }
   554         return closest;
   555     }
   556     return NULL;
   557 }
   558 
   559 int
   560 SDL_SetDisplayMode(const SDL_DisplayMode * mode)
   561 {
   562     SDL_VideoDisplay *display;
   563     SDL_DisplayMode display_mode;
   564     SDL_DisplayMode current_mode;
   565     int i, ncolors;
   566 
   567     if (!_this) {
   568         SDL_UninitializedVideo();
   569         return -1;
   570     }
   571     display = &SDL_CurrentDisplay;
   572     if (!mode) {
   573         mode = &display->desktop_mode;
   574     }
   575     display_mode = *mode;
   576 
   577     /* Default to the current mode */
   578     if (!display_mode.format) {
   579         display_mode.format = display->current_mode.format;
   580     }
   581     if (!display_mode.w) {
   582         display_mode.w = display->current_mode.w;
   583     }
   584     if (!display_mode.h) {
   585         display_mode.h = display->current_mode.h;
   586     }
   587     if (!display_mode.refresh_rate) {
   588         display_mode.refresh_rate = display->current_mode.refresh_rate;
   589     }
   590     /* Get a good video mode, the closest one possible */
   591     if (!SDL_GetClosestDisplayMode(&display_mode, &display_mode)) {
   592         SDL_SetError("No video mode large enough for %dx%d",
   593                      display_mode.w, display_mode.h);
   594         return -1;
   595     }
   596     /* See if there's anything left to do */
   597     SDL_GetCurrentDisplayMode(&current_mode);
   598     if (SDL_memcmp(&display_mode, &current_mode, sizeof(display_mode)) == 0) {
   599         return 0;
   600     }
   601     /* Actually change the display mode */
   602     if (_this->SetDisplayMode(_this, &display_mode) < 0) {
   603         return -1;
   604     }
   605     display->current_mode = display_mode;
   606 
   607     /* Set up a palette, if necessary */
   608     if (SDL_ISPIXELFORMAT_INDEXED(display_mode.format)) {
   609         ncolors = (1 << SDL_BITSPERPIXEL(display_mode.format));
   610     } else {
   611         ncolors = 0;
   612     }
   613     if ((!ncolors && display->palette) || (ncolors && !display->palette)
   614         || (ncolors && ncolors != display->palette->ncolors)) {
   615         if (display->palette) {
   616             SDL_FreePalette(display->palette);
   617             display->palette = NULL;
   618         }
   619         if (ncolors) {
   620             display->palette = SDL_AllocPalette(ncolors);
   621             if (!display->palette) {
   622                 return -1;
   623             }
   624             SDL_DitherColors(display->palette->colors,
   625                              SDL_BITSPERPIXEL(display_mode.format));
   626         }
   627     }
   628     /* Move any fullscreen windows into position */
   629     for (i = 0; i < display->num_windows; ++i) {
   630         SDL_Window *window = &display->windows[i];
   631         if (FULLSCREEN_VISIBLE(window)) {
   632             SDL_SetWindowPosition(window->id, window->x, window->y);
   633         }
   634     }
   635 
   636     return 0;
   637 }
   638 
   639 int
   640 SDL_SetFullscreenDisplayMode(const SDL_DisplayMode * mode)
   641 {
   642     SDL_VideoDisplay *display;
   643     SDL_DisplayMode fullscreen_mode;
   644     int i;
   645 
   646     if (!_this) {
   647         SDL_UninitializedVideo();
   648         return -1;
   649     }
   650     display = &SDL_CurrentDisplay;
   651     if (!mode) {
   652         mode = &display->desktop_mode;
   653     }
   654     if (!SDL_GetClosestDisplayMode(mode, &fullscreen_mode)) {
   655         SDL_SetError("Couldn't find display mode match");
   656         return -1;
   657     }
   658 
   659     if (SDL_memcmp
   660         (&fullscreen_mode, &display->fullscreen_mode,
   661          sizeof(fullscreen_mode)) == 0) {
   662         /* Nothing to do... */
   663         return 0;
   664     }
   665     display->fullscreen_mode = fullscreen_mode;
   666 
   667     /* Actually set the mode if we have a fullscreen window visible */
   668     for (i = 0; i < display->num_windows; ++i) {
   669         SDL_Window *window = &display->windows[i];
   670         if (FULLSCREEN_VISIBLE(window)) {
   671             if (SDL_SetDisplayMode(&display->fullscreen_mode) < 0) {
   672                 return -1;
   673             }
   674         }
   675         if (window->flags & SDL_WINDOW_FULLSCREEN) {
   676             SDL_OnWindowResized(window);
   677         }
   678     }
   679     return 0;
   680 }
   681 
   682 int
   683 SDL_GetFullscreenDisplayMode(SDL_DisplayMode * mode)
   684 {
   685     if (!_this) {
   686         SDL_UninitializedVideo();
   687         return -1;
   688     }
   689     if (mode) {
   690         *mode = SDL_CurrentDisplay.fullscreen_mode;
   691     }
   692     return 0;
   693 }
   694 
   695 int
   696 SDL_SetDisplayPalette(const SDL_Color * colors, int firstcolor, int ncolors)
   697 {
   698     SDL_Palette *palette;
   699     int status = 0;
   700 
   701     if (!_this) {
   702         SDL_UninitializedVideo();
   703         return -1;
   704     }
   705     palette = SDL_CurrentDisplay.palette;
   706     if (!palette) {
   707         SDL_SetError("Display mode does not have a palette");
   708         return -1;
   709     }
   710     status = SDL_SetPaletteColors(palette, colors, firstcolor, ncolors);
   711 
   712     if (_this->SetDisplayPalette) {
   713         if (_this->SetDisplayPalette(_this, palette) < 0) {
   714             status = -1;
   715         }
   716     }
   717     return status;
   718 }
   719 
   720 int
   721 SDL_GetDisplayPalette(SDL_Color * colors, int firstcolor, int ncolors)
   722 {
   723     SDL_Palette *palette;
   724 
   725     if (!_this) {
   726         SDL_UninitializedVideo();
   727         return -1;
   728     }
   729     palette = SDL_CurrentDisplay.palette;
   730     if (!palette->ncolors) {
   731         SDL_SetError("Display mode does not have a palette");
   732         return -1;
   733     }
   734     if (firstcolor < 0 || (firstcolor + ncolors) > palette->ncolors) {
   735         SDL_SetError("Palette indices are out of range");
   736         return -1;
   737     }
   738     SDL_memcpy(colors, &palette->colors[firstcolor],
   739                ncolors * sizeof(*colors));
   740     return 0;
   741 }
   742 
   743 SDL_WindowID
   744 SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
   745 {
   746     const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
   747                                   SDL_WINDOW_OPENGL |
   748                                   SDL_WINDOW_BORDERLESS |
   749                                   SDL_WINDOW_RESIZABLE |
   750                                   SDL_WINDOW_INPUT_GRABBED);
   751     SDL_VideoDisplay *display;
   752     SDL_Window window;
   753     int num_windows;
   754     SDL_Window *windows;
   755 
   756     if (!_this) {
   757         /* Initialize the video system if needed */
   758         if (SDL_VideoInit(NULL, 0) < 0) {
   759             return 0;
   760         }
   761     }
   762     if (flags & SDL_WINDOW_OPENGL) {
   763         if (!_this->GL_CreateContext) {
   764             SDL_SetError("No OpenGL support in video driver");
   765             return 0;
   766         }
   767         SDL_GL_LoadLibrary(NULL);
   768     }
   769     SDL_zero(window);
   770     window.id = _this->next_object_id++;
   771     window.x = x;
   772     window.y = y;
   773     window.w = w;
   774     window.h = h;
   775     window.flags = (flags & allowed_flags);
   776     window.display = _this->current_display;
   777 
   778     if (_this->CreateWindow && _this->CreateWindow(_this, &window) < 0) {
   779         if (flags & SDL_WINDOW_OPENGL) {
   780             SDL_GL_UnloadLibrary();
   781         }
   782         return 0;
   783     }
   784     display = &SDL_CurrentDisplay;
   785     num_windows = display->num_windows;
   786     windows =
   787         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   788     if (!windows) {
   789         if (_this->DestroyWindow) {
   790             _this->DestroyWindow(_this, &window);
   791         }
   792         if (flags & SDL_WINDOW_OPENGL) {
   793             SDL_GL_UnloadLibrary();
   794         }
   795         return 0;
   796     }
   797     windows[num_windows] = window;
   798     display->windows = windows;
   799     display->num_windows++;
   800 
   801     if (title) {
   802         SDL_SetWindowTitle(window.id, title);
   803     }
   804     if (flags & SDL_WINDOW_MAXIMIZED) {
   805         SDL_MaximizeWindow(window.id);
   806     }
   807     if (flags & SDL_WINDOW_MINIMIZED) {
   808         SDL_MinimizeWindow(window.id);
   809     }
   810     if (flags & SDL_WINDOW_SHOWN) {
   811         SDL_ShowWindow(window.id);
   812     }
   813     SDL_UpdateWindowGrab(&window);
   814 
   815     return window.id;
   816 }
   817 
   818 SDL_WindowID
   819 SDL_CreateWindowFrom(const void *data)
   820 {
   821     SDL_VideoDisplay *display;
   822     SDL_Window window;
   823     int num_windows;
   824     SDL_Window *windows;
   825 
   826     if (!_this) {
   827         SDL_UninitializedVideo();
   828         return (0);
   829     }
   830     SDL_zero(window);
   831     window.id = _this->next_object_id++;
   832     window.display = _this->current_display;
   833     window.flags = SDL_WINDOW_FOREIGN;
   834 
   835     if (!_this->CreateWindowFrom ||
   836         _this->CreateWindowFrom(_this, &window, data) < 0) {
   837         return 0;
   838     }
   839     display = &SDL_CurrentDisplay;
   840     num_windows = display->num_windows;
   841     windows =
   842         SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
   843     if (!windows) {
   844         if (_this->DestroyWindow) {
   845             _this->DestroyWindow(_this, &window);
   846         }
   847         if (window.title) {
   848             SDL_free(window.title);
   849         }
   850         return 0;
   851     }
   852     windows[num_windows] = window;
   853     display->windows = windows;
   854     display->num_windows++;
   855 
   856     return window.id;
   857 }
   858 
   859 int
   860 SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
   861 {
   862     const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
   863                                   SDL_WINDOW_OPENGL |
   864                                   SDL_WINDOW_BORDERLESS |
   865                                   SDL_WINDOW_RESIZABLE |
   866                                   SDL_WINDOW_INPUT_GRABBED);
   867     char *title = window->title;
   868 
   869     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
   870         SDL_SetError("No OpenGL support in video driver");
   871         return -1;
   872     }
   873     if ((window->flags & SDL_WINDOW_OPENGL) != (flags & SDL_WINDOW_OPENGL)) {
   874         if (flags & SDL_WINDOW_OPENGL) {
   875             SDL_GL_LoadLibrary(NULL);
   876         } else {
   877             SDL_GL_UnloadLibrary();
   878         }
   879     }
   880 
   881     if (window->flags & SDL_WINDOW_FOREIGN) {
   882         /* Can't destroy and re-create foreign windows, hrm */
   883         flags |= SDL_WINDOW_FOREIGN;
   884     } else {
   885         flags &= ~SDL_WINDOW_FOREIGN;
   886     }
   887 
   888     if (_this->DestroyWindow && !(flags & SDL_WINDOW_FOREIGN)) {
   889         _this->DestroyWindow(_this, window);
   890     }
   891 
   892     window->title = NULL;
   893     window->flags = (flags & allowed_flags);
   894 
   895     if (_this->CreateWindow && !(flags & SDL_WINDOW_FOREIGN)) {
   896         if (_this->CreateWindow(_this, window) < 0) {
   897             if (flags & SDL_WINDOW_OPENGL) {
   898                 SDL_GL_UnloadLibrary();
   899             }
   900             return -1;
   901         }
   902     }
   903 
   904     if (title) {
   905         SDL_SetWindowTitle(window->id, title);
   906         SDL_free(title);
   907     }
   908     if (flags & SDL_WINDOW_MAXIMIZED) {
   909         SDL_MaximizeWindow(window->id);
   910     }
   911     if (flags & SDL_WINDOW_MINIMIZED) {
   912         SDL_MinimizeWindow(window->id);
   913     }
   914     if (flags & SDL_WINDOW_SHOWN) {
   915         SDL_ShowWindow(window->id);
   916     }
   917     SDL_UpdateWindowGrab(window);
   918 
   919     return 0;
   920 }
   921 
   922 SDL_Window *
   923 SDL_GetWindowFromID(SDL_WindowID windowID)
   924 {
   925     int i, j;
   926 
   927     if (!_this) {
   928         SDL_UninitializedVideo();
   929         return NULL;
   930     }
   931     if (windowID) {
   932         for (i = 0; i < _this->num_displays; ++i) {
   933             SDL_VideoDisplay *display = &_this->displays[i];
   934             for (j = 0; j < display->num_windows; ++j) {
   935                 SDL_Window *window = &display->windows[j];
   936                 if (window->id == windowID) {
   937                     return window;
   938                 }
   939             }
   940         }
   941     } else {
   942         /* Just return the first active window */
   943         for (i = 0; i < _this->num_displays; ++i) {
   944             SDL_VideoDisplay *display = &_this->displays[i];
   945             for (j = 0; j < display->num_windows; ++j) {
   946                 SDL_Window *window = &display->windows[j];
   947                 return window;
   948             }
   949         }
   950     }
   951     /* Couldn't find the window with the requested ID */
   952     SDL_SetError("Invalid window ID");
   953     return NULL;
   954 }
   955 
   956 SDL_VideoDisplay *
   957 SDL_GetDisplayFromWindow(SDL_Window * window)
   958 {
   959     if (!_this) {
   960         SDL_UninitializedVideo();
   961         return NULL;
   962     }
   963     if (!window) {
   964         return NULL;
   965     }
   966     return &_this->displays[window->display];
   967 }
   968 
   969 static __inline__ SDL_Renderer *
   970 SDL_GetCurrentRenderer()
   971 {
   972     SDL_Renderer *renderer;
   973 
   974     if (!_this) {
   975         SDL_UninitializedVideo();
   976         return NULL;
   977     }
   978     if (!SDL_CurrentRenderer) {
   979         if (SDL_CreateRenderer(0, -1, 0) < 0) {
   980             return NULL;
   981         }
   982     }
   983     return SDL_CurrentRenderer;
   984 }
   985 
   986 Uint32
   987 SDL_GetWindowFlags(SDL_WindowID windowID)
   988 {
   989     SDL_Window *window = SDL_GetWindowFromID(windowID);
   990 
   991     if (!window) {
   992         return 0;
   993     }
   994     return window->flags;
   995 }
   996 
   997 void
   998 SDL_SetWindowTitle(SDL_WindowID windowID, const char *title)
   999 {
  1000     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1001 
  1002     if (!window || title == window->title) {
  1003         return;
  1004     }
  1005     if (window->title) {
  1006         SDL_free(window->title);
  1007     }
  1008     if (title) {
  1009         window->title = SDL_strdup(title);
  1010     } else {
  1011         window->title = NULL;
  1012     }
  1013 
  1014     if (_this->SetWindowTitle) {
  1015         _this->SetWindowTitle(_this, window);
  1016     }
  1017 }
  1018 
  1019 const char *
  1020 SDL_GetWindowTitle(SDL_WindowID windowID)
  1021 {
  1022     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1023 
  1024     if (!window) {
  1025         return NULL;
  1026     }
  1027     return window->title;
  1028 }
  1029 
  1030 void
  1031 SDL_SetWindowIcon(SDL_WindowID windowID, SDL_Surface * icon)
  1032 {
  1033     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1034 
  1035     if (!window) {
  1036         return;
  1037     }
  1038     if (_this->SetWindowIcon) {
  1039         _this->SetWindowIcon(_this, window, icon);
  1040     }
  1041 }
  1042 
  1043 void
  1044 SDL_SetWindowData(SDL_WindowID windowID, void *userdata)
  1045 {
  1046     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1047 
  1048     if (!window) {
  1049         return;
  1050     }
  1051     window->userdata = userdata;
  1052 }
  1053 
  1054 void *
  1055 SDL_GetWindowData(SDL_WindowID windowID)
  1056 {
  1057     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1058 
  1059     if (!window) {
  1060         return NULL;
  1061     }
  1062     return window->userdata;
  1063 }
  1064 
  1065 void
  1066 SDL_SetWindowPosition(SDL_WindowID windowID, int x, int y)
  1067 {
  1068     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1069     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1070 
  1071     if (!window) {
  1072         return;
  1073     }
  1074     if (x != SDL_WINDOWPOS_UNDEFINED) {
  1075         window->x = x;
  1076     }
  1077     if (y != SDL_WINDOWPOS_UNDEFINED) {
  1078         window->y = y;
  1079     }
  1080     if (_this->SetWindowPosition) {
  1081         _this->SetWindowPosition(_this, window);
  1082     }
  1083     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MOVED, x, y);
  1084 }
  1085 
  1086 void
  1087 SDL_GetWindowPosition(SDL_WindowID windowID, int *x, int *y)
  1088 {
  1089     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1090 
  1091     if (!window) {
  1092         return;
  1093     }
  1094     if (x) {
  1095         *x = window->x;
  1096     }
  1097     if (y) {
  1098         *y = window->y;
  1099     }
  1100 }
  1101 
  1102 void
  1103 SDL_SetWindowSize(SDL_WindowID windowID, int w, int h)
  1104 {
  1105     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1106 
  1107     if (!window) {
  1108         return;
  1109     }
  1110     window->w = w;
  1111     window->h = h;
  1112 
  1113     if (_this->SetWindowSize) {
  1114         _this->SetWindowSize(_this, window);
  1115     }
  1116     SDL_OnWindowResized(window);
  1117 }
  1118 
  1119 void
  1120 SDL_GetWindowSize(SDL_WindowID windowID, int *w, int *h)
  1121 {
  1122     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1123 
  1124     if (window) {
  1125         if (w) {
  1126             *w = window->w;
  1127         }
  1128         if (h) {
  1129             *h = window->h;
  1130         }
  1131     } else {
  1132         if (w) {
  1133             *w = 0;
  1134         }
  1135         if (h) {
  1136             *h = 0;
  1137         }
  1138     }
  1139 }
  1140 
  1141 void
  1142 SDL_ShowWindow(SDL_WindowID windowID)
  1143 {
  1144     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1145 
  1146     if (!window || (window->flags & SDL_WINDOW_SHOWN)) {
  1147         return;
  1148     }
  1149 
  1150     if (_this->ShowWindow) {
  1151         _this->ShowWindow(_this, window);
  1152     }
  1153     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_SHOWN, 0, 0);
  1154 }
  1155 
  1156 void
  1157 SDL_HideWindow(SDL_WindowID windowID)
  1158 {
  1159     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1160 
  1161     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1162         return;
  1163     }
  1164 
  1165     if (_this->HideWindow) {
  1166         _this->HideWindow(_this, window);
  1167     }
  1168     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_HIDDEN, 0, 0);
  1169 }
  1170 
  1171 void
  1172 SDL_RaiseWindow(SDL_WindowID windowID)
  1173 {
  1174     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1175 
  1176     if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
  1177         return;
  1178     }
  1179     if (_this->RaiseWindow) {
  1180         _this->RaiseWindow(_this, window);
  1181     }
  1182 }
  1183 
  1184 void
  1185 SDL_MaximizeWindow(SDL_WindowID windowID)
  1186 {
  1187     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1188 
  1189     if (!window || (window->flags & SDL_WINDOW_MAXIMIZED)) {
  1190         return;
  1191     }
  1192 
  1193     if (_this->MaximizeWindow) {
  1194         _this->MaximizeWindow(_this, window);
  1195     }
  1196     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MAXIMIZED, 0, 0);
  1197 }
  1198 
  1199 void
  1200 SDL_MinimizeWindow(SDL_WindowID windowID)
  1201 {
  1202     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1203 
  1204     if (!window || (window->flags & SDL_WINDOW_MINIMIZED)) {
  1205         return;
  1206     }
  1207 
  1208     if (_this->MinimizeWindow) {
  1209         _this->MinimizeWindow(_this, window);
  1210     }
  1211     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MINIMIZED, 0, 0);
  1212 }
  1213 
  1214 void
  1215 SDL_RestoreWindow(SDL_WindowID windowID)
  1216 {
  1217     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1218 
  1219     if (!window
  1220         || !(window->flags & (SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED))) {
  1221         return;
  1222     }
  1223 
  1224     if (_this->RestoreWindow) {
  1225         _this->RestoreWindow(_this, window);
  1226     }
  1227     SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_RESTORED, 0, 0);
  1228 }
  1229 
  1230 int
  1231 SDL_SetWindowFullscreen(SDL_WindowID windowID, int fullscreen)
  1232 {
  1233     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1234 
  1235     if (!window) {
  1236         return -1;
  1237     }
  1238     if (fullscreen) {
  1239         fullscreen = SDL_WINDOW_FULLSCREEN;
  1240     }
  1241     if ((window->flags & SDL_WINDOW_FULLSCREEN) == fullscreen) {
  1242         return 0;
  1243     }
  1244     if (fullscreen) {
  1245         window->flags |= SDL_WINDOW_FULLSCREEN;
  1246 
  1247         if (FULLSCREEN_VISIBLE(window)) {
  1248             SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1249 
  1250             /* Hide any other fullscreen windows */
  1251             int i;
  1252             for (i = 0; i < display->num_windows; ++i) {
  1253                 SDL_Window *other = &display->windows[i];
  1254                 if (other->id != windowID && FULLSCREEN_VISIBLE(other)) {
  1255                     SDL_MinimizeWindow(other->id);
  1256                 }
  1257             }
  1258 
  1259             SDL_SetDisplayMode(&display->fullscreen_mode);
  1260         }
  1261     } else {
  1262         window->flags &= ~SDL_WINDOW_FULLSCREEN;
  1263 
  1264         if (FULLSCREEN_VISIBLE(window)) {
  1265             SDL_SetDisplayMode(NULL);
  1266         }
  1267     }
  1268     return 0;
  1269 }
  1270 
  1271 void
  1272 SDL_SetWindowGrab(SDL_WindowID windowID, int mode)
  1273 {
  1274     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1275 
  1276     if (!window || (!!mode == !!(window->flags & SDL_WINDOW_INPUT_GRABBED))) {
  1277         return;
  1278     }
  1279     if (mode) {
  1280         window->flags |= SDL_WINDOW_INPUT_GRABBED;
  1281     } else {
  1282         window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
  1283     }
  1284     SDL_UpdateWindowGrab(window);
  1285 }
  1286 
  1287 static void
  1288 SDL_UpdateWindowGrab(SDL_Window * window)
  1289 {
  1290     if ((window->flags & SDL_WINDOW_INPUT_FOCUS) && _this->SetWindowGrab) {
  1291         _this->SetWindowGrab(_this, window);
  1292     }
  1293 }
  1294 
  1295 int
  1296 SDL_GetWindowGrab(SDL_WindowID windowID)
  1297 {
  1298     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1299 
  1300     if (!window) {
  1301         return 0;
  1302     }
  1303     return ((window->flags & SDL_WINDOW_INPUT_GRABBED) != 0);
  1304 }
  1305 
  1306 void
  1307 SDL_OnWindowShown(SDL_Window * window)
  1308 {
  1309     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1310         SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_FOCUS_GAINED, 0, 0);
  1311     }
  1312 }
  1313 
  1314 void
  1315 SDL_OnWindowHidden(SDL_Window * window)
  1316 {
  1317     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1318         SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
  1319     }
  1320 }
  1321 
  1322 void
  1323 SDL_OnWindowResized(SDL_Window * window)
  1324 {
  1325     SDL_Renderer *renderer = window->renderer;
  1326 
  1327     if (renderer && renderer->DisplayModeChanged) {
  1328         renderer->DisplayModeChanged(renderer);
  1329     }
  1330 }
  1331 
  1332 void
  1333 SDL_OnWindowFocusGained(SDL_Window * window)
  1334 {
  1335     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1336 
  1337     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1338         SDL_SetDisplayMode(&display->fullscreen_mode);
  1339     }
  1340     if (display->gamma && _this->SetDisplayGammaRamp) {
  1341         _this->SetDisplayGammaRamp(_this, display->gamma);
  1342     }
  1343     if ((window->flags & (SDL_WINDOW_INPUT_GRABBED | SDL_WINDOW_FULLSCREEN))
  1344         && _this->SetWindowGrab) {
  1345         _this->SetWindowGrab(_this, window);
  1346     }
  1347 }
  1348 
  1349 void
  1350 SDL_OnWindowFocusLost(SDL_Window * window)
  1351 {
  1352     SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
  1353 
  1354     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1355         SDL_MinimizeWindow(window->id);
  1356         SDL_SetDisplayMode(NULL);
  1357     }
  1358     if (display->gamma && _this->SetDisplayGammaRamp) {
  1359         _this->SetDisplayGammaRamp(_this, display->saved_gamma);
  1360     }
  1361     if ((window->flags & (SDL_WINDOW_INPUT_GRABBED | SDL_WINDOW_FULLSCREEN))
  1362         && _this->SetWindowGrab) {
  1363         _this->SetWindowGrab(_this, window);
  1364     }
  1365 }
  1366 
  1367 SDL_WindowID
  1368 SDL_GetFocusWindow(void)
  1369 {
  1370     SDL_VideoDisplay *display;
  1371     int i;
  1372 
  1373     if (!_this) {
  1374         return 0;
  1375     }
  1376     display = &SDL_CurrentDisplay;
  1377     for (i = 0; i < display->num_windows; ++i) {
  1378         SDL_Window *window = &display->windows[i];
  1379 
  1380         if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
  1381             return window->id;
  1382         }
  1383     }
  1384     return 0;
  1385 }
  1386 
  1387 void
  1388 SDL_DestroyWindow(SDL_WindowID windowID)
  1389 {
  1390     int i, j;
  1391 
  1392     if (!_this) {
  1393         return;
  1394     }
  1395     /* Restore video mode, etc. */
  1396     SDL_SendWindowEvent(windowID, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
  1397 
  1398     for (i = 0; i < _this->num_displays; ++i) {
  1399         SDL_VideoDisplay *display = &_this->displays[i];
  1400         for (j = 0; j < display->num_windows; ++j) {
  1401             SDL_Window *window = &display->windows[j];
  1402             if (window->id != windowID) {
  1403                 continue;
  1404             }
  1405             if (window->title) {
  1406                 SDL_free(window->title);
  1407                 window->title = NULL;
  1408             }
  1409             if (window->renderer) {
  1410                 SDL_DestroyRenderer(window->id);
  1411                 window->renderer = NULL;
  1412             }
  1413             if (_this->DestroyWindow) {
  1414                 _this->DestroyWindow(_this, window);
  1415             }
  1416             if (window->flags & SDL_WINDOW_OPENGL) {
  1417                 SDL_GL_UnloadLibrary();
  1418             }
  1419             if (j != display->num_windows - 1) {
  1420                 SDL_memcpy(&display->windows[i],
  1421                            &display->windows[i + 1],
  1422                            (display->num_windows - i - 1) * sizeof(*window));
  1423             }
  1424             --display->num_windows;
  1425             return;
  1426         }
  1427     }
  1428 }
  1429 
  1430 void
  1431 SDL_AddRenderDriver(int displayIndex, const SDL_RenderDriver * driver)
  1432 {
  1433     SDL_VideoDisplay *display;
  1434     SDL_RenderDriver *render_drivers;
  1435 
  1436     if (displayIndex >= _this->num_displays) {
  1437         return;
  1438     }
  1439     display = &_this->displays[displayIndex];
  1440 
  1441     render_drivers =
  1442         SDL_realloc(display->render_drivers,
  1443                     (display->num_render_drivers +
  1444                      1) * sizeof(*render_drivers));
  1445     if (render_drivers) {
  1446         render_drivers[display->num_render_drivers] = *driver;
  1447         display->render_drivers = render_drivers;
  1448         display->num_render_drivers++;
  1449     }
  1450 }
  1451 
  1452 int
  1453 SDL_GetNumRenderDrivers(void)
  1454 {
  1455     if (_this) {
  1456         return SDL_CurrentDisplay.num_render_drivers;
  1457     }
  1458     return 0;
  1459 }
  1460 
  1461 int
  1462 SDL_GetRenderDriverInfo(int index, SDL_RendererInfo * info)
  1463 {
  1464     if (!_this) {
  1465         SDL_UninitializedVideo();
  1466         return -1;
  1467     }
  1468     if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
  1469         SDL_SetError("index must be in the range of 0 - %d",
  1470                      SDL_GetNumRenderDrivers() - 1);
  1471         return -1;
  1472     }
  1473     *info = SDL_CurrentDisplay.render_drivers[index].info;
  1474     return 0;
  1475 }
  1476 
  1477 int
  1478 SDL_CreateRenderer(SDL_WindowID windowID, int index, Uint32 flags)
  1479 {
  1480     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1481 
  1482     if (!window) {
  1483         SDL_SetError("Invalid window ID");
  1484         return -1;
  1485     }
  1486 
  1487     /* Free any existing renderer */
  1488     SDL_DestroyRenderer(windowID);
  1489 
  1490     if (index < 0) {
  1491         const char *override = SDL_getenv("SDL_VIDEO_RENDERER");
  1492         if (override) {
  1493             int i, n = SDL_GetNumRenderDrivers();
  1494             for (i = 0; i < n; ++i) {
  1495                 SDL_RenderDriver *driver =
  1496                     &SDL_CurrentDisplay.render_drivers[i];
  1497                 if (SDL_strcasecmp(override, driver->info.name) == 0) {
  1498                     index = i;
  1499                     break;
  1500                 }
  1501             }
  1502         }
  1503     }
  1504     if (index < 0) {
  1505         int n = SDL_GetNumRenderDrivers();
  1506         for (index = 0; index < n; ++index) {
  1507             SDL_RenderDriver *driver =
  1508                 &SDL_CurrentDisplay.render_drivers[index];
  1509 
  1510             if ((driver->info.flags & flags) == flags) {
  1511                 /* Create a new renderer instance */
  1512                 window->renderer = SDL_CurrentDisplay.render_drivers[index].CreateRenderer(window, flags);
  1513                 if (window->renderer) {
  1514                     /* Yay, we got one! */
  1515                     break;
  1516                 }
  1517             }
  1518         }
  1519         if (index == n) {
  1520             SDL_SetError("Couldn't find matching render driver");
  1521             return -1;
  1522         }
  1523     } else {
  1524         if (index >= SDL_GetNumRenderDrivers()) {
  1525             SDL_SetError("index must be -1 or in the range of 0 - %d",
  1526                          SDL_GetNumRenderDrivers() - 1);
  1527             return -1;
  1528         }
  1529 
  1530         /* Create a new renderer instance */
  1531         window->renderer = SDL_CurrentDisplay.render_drivers[index].CreateRenderer(window, flags);
  1532     }
  1533 
  1534     if (window->renderer == NULL) {
  1535         /* Assuming renderer set its error */
  1536         return -1;
  1537     }
  1538 
  1539     SDL_SelectRenderer(window->id);
  1540 
  1541     return 0;
  1542 }
  1543 
  1544 int
  1545 SDL_SelectRenderer(SDL_WindowID windowID)
  1546 {
  1547     SDL_Window *window = SDL_GetWindowFromID(windowID);
  1548     SDL_Renderer *renderer;
  1549 
  1550     if (!window) {
  1551         SDL_SetError("Invalid window ID");
  1552         return -1;
  1553     }
  1554     renderer = window->renderer;
  1555     if (renderer) {
  1556         if (renderer->ActivateRenderer) {
  1557             if (renderer->ActivateRenderer(renderer) < 0) {
  1558                 return -1;
  1559             }
  1560         }
  1561         SDL_CurrentDisplay.current_renderer = renderer;
  1562     } else {
  1563         if (SDL_CreateRenderer(windowID, -1, 0) < 0) {
  1564             return -1;
  1565         }
  1566     }
  1567     return 0;
  1568 }
  1569 
  1570 int
  1571 SDL_GetRendererInfo(SDL_RendererInfo * info)
  1572 {
  1573     SDL_Renderer *renderer = SDL_GetCurrentRenderer();
  1574     if (!renderer) {
  1575         return -1;
  1576     }
  1577     *info = renderer->info;
  1578     return 0;
  1579 }
  1580 
  1581 SDL_TextureID
  1582 SDL_CreateTexture(Uint32 format, int access, int w, int h)
  1583 {
  1584     int hash;
  1585     SDL_Renderer *renderer;
  1586     SDL_Texture *texture;
  1587 
  1588     renderer = SDL_GetCurrentRenderer();
  1589     if (!renderer) {
  1590         return 0;
  1591     }
  1592     if (!renderer->CreateTexture) {
  1593         SDL_Unsupported();
  1594         return 0;
  1595     }
  1596     texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
  1597     if (!texture) {
  1598         SDL_OutOfMemory();
  1599         return 0;
  1600     }
  1601     texture->id = _this->next_object_id++;
  1602     texture->format = format;
  1603     texture->access = access;
  1604     texture->w = w;
  1605     texture->h = h;
  1606     texture->r = 255;
  1607     texture->g = 255;
  1608     texture->b = 255;
  1609     texture->a = 255;
  1610     texture->renderer = renderer;
  1611 
  1612     if (renderer->CreateTexture(renderer, texture) < 0) {
  1613         if (renderer->DestroyTexture) {
  1614             renderer->DestroyTexture(renderer, texture);
  1615         }
  1616         SDL_free(texture);
  1617         return 0;
  1618     }
  1619     hash = (texture->id % SDL_arraysize(SDL_CurrentDisplay.textures));
  1620     texture->next = SDL_CurrentDisplay.textures[hash];
  1621     SDL_CurrentDisplay.textures[hash] = texture;
  1622 
  1623     return texture->id;
  1624 }
  1625 
  1626 SDL_TextureID
  1627 SDL_CreateTextureFromSurface(Uint32 format, SDL_Surface * surface)
  1628 {
  1629     SDL_TextureID textureID;
  1630     Uint32 requested_format = format;
  1631     SDL_PixelFormat *fmt;
  1632     SDL_Renderer *renderer;
  1633     int bpp;
  1634     Uint32 Rmask, Gmask, Bmask, Amask;
  1635 
  1636     if (!surface) {
  1637         SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
  1638         return 0;
  1639     }
  1640     fmt = surface->format;
  1641 
  1642     renderer = SDL_GetCurrentRenderer();
  1643     if (!renderer) {
  1644         return 0;
  1645     }
  1646 
  1647     if (format) {
  1648         if (!SDL_PixelFormatEnumToMasks
  1649             (format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
  1650             SDL_SetError("Unknown pixel format");
  1651             return 0;
  1652         }
  1653     } else {
  1654         if (surface->format->Amask
  1655             || !(surface->map->info.flags &
  1656                  (SDL_COPY_COLORKEY | SDL_COPY_MASK | SDL_COPY_BLEND))) {
  1657             Uint32 it;
  1658             int pfmt;
  1659 
  1660             /* Pixel formats, sorted by best first */
  1661             static const Uint32 sdl_pformats[] = {
  1662                 SDL_PIXELFORMAT_ARGB8888,
  1663                 SDL_PIXELFORMAT_RGBA8888,
  1664                 SDL_PIXELFORMAT_ABGR8888,
  1665                 SDL_PIXELFORMAT_BGRA8888,
  1666                 SDL_PIXELFORMAT_RGB888,
  1667                 SDL_PIXELFORMAT_BGR888,
  1668                 SDL_PIXELFORMAT_RGB24,
  1669                 SDL_PIXELFORMAT_BGR24,
  1670                 SDL_PIXELFORMAT_RGB565,
  1671                 SDL_PIXELFORMAT_BGR565,
  1672                 SDL_PIXELFORMAT_ARGB1555,
  1673                 SDL_PIXELFORMAT_ABGR1555,
  1674                 SDL_PIXELFORMAT_RGB555,
  1675                 SDL_PIXELFORMAT_BGR555,
  1676                 SDL_PIXELFORMAT_ARGB4444,
  1677                 SDL_PIXELFORMAT_ABGR4444,
  1678                 SDL_PIXELFORMAT_RGB444,
  1679                 SDL_PIXELFORMAT_ARGB2101010,
  1680                 SDL_PIXELFORMAT_INDEX8,
  1681                 SDL_PIXELFORMAT_INDEX4LSB,
  1682                 SDL_PIXELFORMAT_INDEX4MSB,
  1683                 SDL_PIXELFORMAT_RGB332,
  1684                 SDL_PIXELFORMAT_INDEX1LSB,
  1685                 SDL_PIXELFORMAT_INDEX1MSB,
  1686                 SDL_PIXELFORMAT_UNKNOWN
  1687             };
  1688 
  1689             bpp = fmt->BitsPerPixel;
  1690             Rmask = fmt->Rmask;
  1691             Gmask = fmt->Gmask;
  1692             Bmask = fmt->Bmask;
  1693             Amask = fmt->Amask;
  1694 
  1695             format =
  1696                 SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
  1697             if (!format) {
  1698                 SDL_SetError("Unknown pixel format");
  1699                 return 0;
  1700             }
  1701 
  1702             /* Search requested format in the supported texture */
  1703             /* formats by current renderer                      */
  1704             for (it = 0; it < renderer->info.num_texture_formats; it++) {
  1705                 if (renderer->info.texture_formats[it] == format) {
  1706                     break;
  1707                 }
  1708             }
  1709 
  1710             /* If requested format can't be found, search any best */
  1711             /* format which renderer provides                      */
  1712             if (it == renderer->info.num_texture_formats) {
  1713                 pfmt = 0;
  1714                 for (;;) {
  1715                     if (sdl_pformats[pfmt] == SDL_PIXELFORMAT_UNKNOWN) {
  1716                         break;
  1717                     }
  1718 
  1719                     for (it = 0; it < renderer->info.num_texture_formats;
  1720                          it++) {
  1721                         if (renderer->info.texture_formats[it] ==
  1722                             sdl_pformats[pfmt]) {
  1723                             break;
  1724                         }
  1725                     }
  1726 
  1727                     if (it != renderer->info.num_texture_formats) {
  1728                         /* The best format has been found */
  1729                         break;
  1730                     }
  1731                     pfmt++;
  1732                 }
  1733 
  1734                 /* If any format can't be found, then return an error */
  1735                 if (it == renderer->info.num_texture_formats) {
  1736                     SDL_SetError
  1737                         ("Any of the supported pixel formats can't be found");
  1738                     return 0;
  1739                 }
  1740 
  1741                 /* Convert found pixel format back to color masks */
  1742                 if (SDL_PixelFormatEnumToMasks
  1743                     (renderer->info.texture_formats[it], &bpp, &Rmask, &Gmask,
  1744                      &Bmask, &Amask) != SDL_TRUE) {
  1745                     SDL_SetError("Unknown pixel format");
  1746                     return 0;
  1747                 }
  1748             }
  1749         } else {
  1750             /* Need a format with alpha */
  1751             Uint32 it;
  1752             int apfmt;
  1753 
  1754             /* Pixel formats with alpha, sorted by best first */
  1755             static const Uint32 sdl_alpha_pformats[] = {
  1756                 SDL_PIXELFORMAT_ARGB8888,
  1757                 SDL_PIXELFORMAT_RGBA8888,
  1758                 SDL_PIXELFORMAT_ABGR8888,
  1759                 SDL_PIXELFORMAT_BGRA8888,
  1760                 SDL_PIXELFORMAT_ARGB1555,
  1761                 SDL_PIXELFORMAT_ABGR1555,
  1762                 SDL_PIXELFORMAT_ARGB4444,
  1763                 SDL_PIXELFORMAT_ABGR4444,
  1764                 SDL_PIXELFORMAT_ARGB2101010,
  1765                 SDL_PIXELFORMAT_UNKNOWN
  1766             };
  1767 
  1768             if (surface->format->Amask) {
  1769                 /* If surface already has alpha, then try an original */
  1770                 /* surface format first                               */
  1771                 bpp = fmt->BitsPerPixel;
  1772                 Rmask = fmt->Rmask;
  1773                 Gmask = fmt->Gmask;
  1774                 Bmask = fmt->Bmask;
  1775                 Amask = fmt->Amask;
  1776             } else {
  1777                 bpp = 32;
  1778                 Rmask = 0x00FF0000;
  1779                 Gmask = 0x0000FF00;
  1780                 Bmask = 0x000000FF;
  1781                 Amask = 0xFF000000;
  1782             }
  1783 
  1784             format =
  1785                 SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
  1786             if (!format) {
  1787                 SDL_SetError("Unknown pixel format");
  1788                 return 0;
  1789             }
  1790 
  1791             /* Search this format in the supported texture formats */
  1792             /* by current renderer                                 */
  1793             for (it = 0; it < renderer->info.num_texture_formats; it++) {
  1794                 if (renderer->info.texture_formats[it] == format) {
  1795                     break;
  1796                 }
  1797             }
  1798 
  1799             /* If this format can't be found, search any best       */
  1800             /* compatible format with alpha which renderer provides */
  1801             if (it == renderer->info.num_texture_formats) {
  1802                 apfmt = 0;
  1803                 for (;;) {
  1804                     if (sdl_alpha_pformats[apfmt] == SDL_PIXELFORMAT_UNKNOWN) {
  1805                         break;
  1806                     }
  1807 
  1808                     for (it = 0; it < renderer->info.num_texture_formats;
  1809                          it++) {
  1810                         if (renderer->info.texture_formats[it] ==
  1811                             sdl_alpha_pformats[apfmt]) {
  1812                             break;
  1813                         }
  1814                     }
  1815 
  1816                     if (it != renderer->info.num_texture_formats) {
  1817                         /* Compatible format has been found */
  1818                         break;
  1819                     }
  1820                     apfmt++;
  1821                 }
  1822 
  1823                 /* If compatible format can't be found, then return an error */
  1824                 if (it == renderer->info.num_texture_formats) {
  1825                     SDL_SetError("Compatible pixel format can't be found");
  1826                     return 0;
  1827                 }
  1828 
  1829                 /* Convert found pixel format back to color masks */
  1830                 if (SDL_PixelFormatEnumToMasks
  1831                     (renderer->info.texture_formats[it], &bpp, &Rmask, &Gmask,
  1832                      &Bmask, &Amask) != SDL_TRUE) {
  1833                     SDL_SetError("Unknown pixel format");
  1834                     return 0;
  1835                 }
  1836             }
  1837         }
  1838 
  1839         format = SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
  1840         if (!format) {
  1841             SDL_SetError("Unknown pixel format");
  1842             return 0;
  1843         }
  1844     }
  1845 
  1846     textureID =
  1847         SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1848                           surface->h);
  1849     if (!textureID && !requested_format) {
  1850         SDL_DisplayMode desktop_mode;
  1851         SDL_GetDesktopDisplayMode(&desktop_mode);
  1852         format = desktop_mode.format;
  1853         textureID =
  1854             SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
  1855                               surface->h);
  1856     }
  1857     if (!textureID) {
  1858         return 0;
  1859     }
  1860     if (bpp == fmt->BitsPerPixel && Rmask == fmt->Rmask && Gmask == fmt->Gmask
  1861         && Bmask == fmt->Bmask && Amask == fmt->Amask) {
  1862         if (SDL_MUSTLOCK(surface)) {
  1863             SDL_LockSurface(surface);
  1864             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1865                               surface->pitch);
  1866             SDL_UnlockSurface(surface);
  1867         } else {
  1868             SDL_UpdateTexture(textureID, NULL, surface->pixels,
  1869                               surface->pitch);
  1870         }
  1871     } else {
  1872         SDL_PixelFormat dst_fmt;
  1873         SDL_Surface *dst = NULL;
  1874 
  1875         /* Set up a destination surface for the texture update */
  1876         SDL_InitFormat(&dst_fmt, bpp, Rmask, Gmask, Bmask, Amask);
  1877         if (SDL_ISPIXELFORMAT_INDEXED(format)) {
  1878             dst_fmt.palette =
  1879                 SDL_AllocPalette((1 << SDL_BITSPERPIXEL(format)));
  1880             if (dst_fmt.palette) {
  1881                 /*
  1882                  * FIXME: Should we try to copy
  1883                  * fmt->palette?
  1884                  */
  1885                 SDL_DitherColors(dst_fmt.palette->colors,
  1886                                  SDL_BITSPERPIXEL(format));
  1887             }
  1888         }
  1889         dst = SDL_ConvertSurface(surface, &dst_fmt, 0);
  1890         if (dst) {
  1891             SDL_UpdateTexture(textureID, NULL, dst->pixels, dst->pitch);
  1892             SDL_FreeSurface(dst);
  1893         }
  1894         if (dst_fmt.palette) {
  1895             SDL_FreePalette(dst_fmt.palette);
  1896         }
  1897         if (!dst) {
  1898             SDL_DestroyTexture(textureID);
  1899             return 0;
  1900         }
  1901     }
  1902 
  1903     {
  1904         Uint8 r, g, b, a;
  1905         int blendMode;
  1906         int scaleMode;
  1907 
  1908         SDL_GetSurfaceColorMod(surface, &r, &g, &b);
  1909         SDL_SetTextureColorMod(textureID, r, g, b);
  1910 
  1911         SDL_GetSurfaceAlphaMod(surface, &a);
  1912         SDL_SetTextureAlphaMod(textureID, a);
  1913 
  1914         SDL_GetSurfaceBlendMode(surface, &blendMode);
  1915         SDL_SetTextureBlendMode(textureID, blendMode);
  1916 
  1917         SDL_GetSurfaceScaleMode(surface, &scaleMode);
  1918         SDL_SetTextureScaleMode(textureID, scaleMode);
  1919     }
  1920 
  1921     if (SDL_ISPIXELFORMAT_INDEXED(format) && fmt->palette) {
  1922         SDL_SetTexturePalette(textureID, fmt->palette->colors, 0,
  1923                               fmt->palette->ncolors);
  1924     }
  1925     return textureID;
  1926 }
  1927 
  1928 static __inline__ SDL_Texture *
  1929 SDL_GetTextureFromID(SDL_TextureID textureID)
  1930 {
  1931     int hash;
  1932     SDL_Texture *texture;
  1933 
  1934     if (!_this) {
  1935         return NULL;
  1936     }
  1937     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  1938     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  1939          texture = texture->next) {
  1940         if (texture->id == textureID) {
  1941             return texture;
  1942         }
  1943     }
  1944     return NULL;
  1945 }
  1946 
  1947 int
  1948 SDL_QueryTexture(SDL_TextureID textureID, Uint32 * format, int *access,
  1949                  int *w, int *h)
  1950 {
  1951     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1952 
  1953     if (!texture) {
  1954         return -1;
  1955     }
  1956     if (format) {
  1957         *format = texture->format;
  1958     }
  1959     if (access) {
  1960         *access = texture->access;
  1961     }
  1962     if (w) {
  1963         *w = texture->w;
  1964     }
  1965     if (h) {
  1966         *h = texture->h;
  1967     }
  1968     return 0;
  1969 }
  1970 
  1971 int
  1972 SDL_QueryTexturePixels(SDL_TextureID textureID, void **pixels, int *pitch)
  1973 {
  1974     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1975     SDL_Renderer *renderer;
  1976 
  1977     if (!texture) {
  1978         return -1;
  1979     }
  1980     renderer = texture->renderer;
  1981     if (!renderer->QueryTexturePixels) {
  1982         SDL_Unsupported();
  1983         return -1;
  1984     }
  1985     return renderer->QueryTexturePixels(renderer, texture, pixels, pitch);
  1986 }
  1987 
  1988 int
  1989 SDL_SetTexturePalette(SDL_TextureID textureID, const SDL_Color * colors,
  1990                       int firstcolor, int ncolors)
  1991 {
  1992     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  1993     SDL_Renderer *renderer;
  1994 
  1995     if (!texture) {
  1996         return -1;
  1997     }
  1998     renderer = texture->renderer;
  1999     if (!renderer->SetTexturePalette) {
  2000         SDL_Unsupported();
  2001         return -1;
  2002     }
  2003     return renderer->SetTexturePalette(renderer, texture, colors, firstcolor,
  2004                                        ncolors);
  2005 }
  2006 
  2007 int
  2008 SDL_GetTexturePalette(SDL_TextureID textureID, SDL_Color * colors,
  2009                       int firstcolor, int ncolors)
  2010 {
  2011     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2012     SDL_Renderer *renderer;
  2013 
  2014     if (!texture) {
  2015         return -1;
  2016     }
  2017     renderer = texture->renderer;
  2018     if (!renderer->GetTexturePalette) {
  2019         SDL_Unsupported();
  2020         return -1;
  2021     }
  2022     return renderer->GetTexturePalette(renderer, texture, colors, firstcolor,
  2023                                        ncolors);
  2024 }
  2025 
  2026 int
  2027 SDL_SetTextureColorMod(SDL_TextureID textureID, Uint8 r, Uint8 g, Uint8 b)
  2028 {
  2029     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2030     SDL_Renderer *renderer;
  2031 
  2032     if (!texture) {
  2033         return -1;
  2034     }
  2035     renderer = texture->renderer;
  2036     if (!renderer->SetTextureColorMod) {
  2037         SDL_Unsupported();
  2038         return -1;
  2039     }
  2040     if (r < 255 || g < 255 || b < 255) {
  2041         texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
  2042     } else {
  2043         texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
  2044     }
  2045     texture->r = r;
  2046     texture->g = g;
  2047     texture->b = b;
  2048     return renderer->SetTextureColorMod(renderer, texture);
  2049 }
  2050 
  2051 int
  2052 SDL_GetTextureColorMod(SDL_TextureID textureID, Uint8 * r, Uint8 * g,
  2053                        Uint8 * b)
  2054 {
  2055     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2056     SDL_Renderer *renderer;
  2057 
  2058     if (!texture) {
  2059         return -1;
  2060     }
  2061     renderer = texture->renderer;
  2062     if (r) {
  2063         *r = texture->r;
  2064     }
  2065     if (g) {
  2066         *g = texture->g;
  2067     }
  2068     if (b) {
  2069         *b = texture->b;
  2070     }
  2071     return 0;
  2072 }
  2073 
  2074 int
  2075 SDL_SetTextureAlphaMod(SDL_TextureID textureID, Uint8 alpha)
  2076 {
  2077     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2078     SDL_Renderer *renderer;
  2079 
  2080     if (!texture) {
  2081         return -1;
  2082     }
  2083     renderer = texture->renderer;
  2084     if (!renderer->SetTextureAlphaMod) {
  2085         SDL_Unsupported();
  2086         return -1;
  2087     }
  2088     if (alpha < 255) {
  2089         texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
  2090     } else {
  2091         texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
  2092     }
  2093     texture->a = alpha;
  2094     return renderer->SetTextureAlphaMod(renderer, texture);
  2095 }
  2096 
  2097 int
  2098 SDL_GetTextureAlphaMod(SDL_TextureID textureID, Uint8 * alpha)
  2099 {
  2100     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2101 
  2102     if (!texture) {
  2103         return -1;
  2104     }
  2105     if (alpha) {
  2106         *alpha = texture->a;
  2107     }
  2108     return 0;
  2109 }
  2110 
  2111 int
  2112 SDL_SetTextureBlendMode(SDL_TextureID textureID, int blendMode)
  2113 {
  2114     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2115     SDL_Renderer *renderer;
  2116 
  2117     if (!texture) {
  2118         return -1;
  2119     }
  2120     renderer = texture->renderer;
  2121     if (!renderer->SetTextureBlendMode) {
  2122         SDL_Unsupported();
  2123         return -1;
  2124     }
  2125     texture->blendMode = blendMode;
  2126     return renderer->SetTextureBlendMode(renderer, texture);
  2127 }
  2128 
  2129 int
  2130 SDL_GetTextureBlendMode(SDL_TextureID textureID, int *blendMode)
  2131 {
  2132     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2133 
  2134     if (!texture) {
  2135         return -1;
  2136     }
  2137     if (blendMode) {
  2138         *blendMode = texture->blendMode;
  2139     }
  2140     return 0;
  2141 }
  2142 
  2143 int
  2144 SDL_SetTextureScaleMode(SDL_TextureID textureID, int scaleMode)
  2145 {
  2146     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2147     SDL_Renderer *renderer;
  2148 
  2149     if (!texture) {
  2150         return -1;
  2151     }
  2152     renderer = texture->renderer;
  2153     if (!renderer->SetTextureScaleMode) {
  2154         SDL_Unsupported();
  2155         return -1;
  2156     }
  2157     texture->scaleMode = scaleMode;
  2158     return renderer->SetTextureScaleMode(renderer, texture);
  2159 }
  2160 
  2161 int
  2162 SDL_GetTextureScaleMode(SDL_TextureID textureID, int *scaleMode)
  2163 {
  2164     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2165 
  2166     if (!texture) {
  2167         return -1;
  2168     }
  2169     if (scaleMode) {
  2170         *scaleMode = texture->scaleMode;
  2171     }
  2172     return 0;
  2173 }
  2174 
  2175 int
  2176 SDL_UpdateTexture(SDL_TextureID textureID, const SDL_Rect * rect,
  2177                   const void *pixels, int pitch)
  2178 {
  2179     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2180     SDL_Renderer *renderer;
  2181     SDL_Rect full_rect;
  2182 
  2183     if (!texture) {
  2184         return -1;
  2185     }
  2186     renderer = texture->renderer;
  2187     if (!renderer->UpdateTexture) {
  2188         SDL_Unsupported();
  2189         return -1;
  2190     }
  2191     if (!rect) {
  2192         full_rect.x = 0;
  2193         full_rect.y = 0;
  2194         full_rect.w = texture->w;
  2195         full_rect.h = texture->h;
  2196         rect = &full_rect;
  2197     }
  2198     return renderer->UpdateTexture(renderer, texture, rect, pixels, pitch);
  2199 }
  2200 
  2201 int
  2202 SDL_LockTexture(SDL_TextureID textureID, const SDL_Rect * rect, int markDirty,
  2203                 void **pixels, int *pitch)
  2204 {
  2205     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2206     SDL_Renderer *renderer;
  2207     SDL_Rect full_rect;
  2208 
  2209     if (!texture) {
  2210         return -1;
  2211     }
  2212     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  2213         SDL_SetError("SDL_LockTexture(): texture must be streaming");
  2214         return -1;
  2215     }
  2216     renderer = texture->renderer;
  2217     if (!renderer->LockTexture) {
  2218         SDL_Unsupported();
  2219         return -1;
  2220     }
  2221     if (!rect) {
  2222         full_rect.x = 0;
  2223         full_rect.y = 0;
  2224         full_rect.w = texture->w;
  2225         full_rect.h = texture->h;
  2226         rect = &full_rect;
  2227     }
  2228     return renderer->LockTexture(renderer, texture, rect, markDirty, pixels,
  2229                                  pitch);
  2230 }
  2231 
  2232 void
  2233 SDL_UnlockTexture(SDL_TextureID textureID)
  2234 {
  2235     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2236     SDL_Renderer *renderer;
  2237 
  2238     if (!texture) {
  2239         return;
  2240     }
  2241     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  2242         return;
  2243     }
  2244     renderer = texture->renderer;
  2245     if (!renderer->UnlockTexture) {
  2246         return;
  2247     }
  2248     renderer->UnlockTexture(renderer, texture);
  2249 }
  2250 
  2251 void
  2252 SDL_DirtyTexture(SDL_TextureID textureID, int numrects,
  2253                  const SDL_Rect * rects)
  2254 {
  2255     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2256     SDL_Renderer *renderer;
  2257 
  2258     if (!texture) {
  2259         return;
  2260     }
  2261     if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
  2262         return;
  2263     }
  2264     renderer = texture->renderer;
  2265     if (!renderer->DirtyTexture) {
  2266         return;
  2267     }
  2268     renderer->DirtyTexture(renderer, texture, numrects, rects);
  2269 }
  2270 
  2271 int
  2272 SDL_SetRenderDrawColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a)
  2273 {
  2274     SDL_Renderer *renderer;
  2275 
  2276     renderer = SDL_GetCurrentRenderer();
  2277     if (!renderer) {
  2278         return -1;
  2279     }
  2280     renderer->r = r;
  2281     renderer->g = g;
  2282     renderer->b = b;
  2283     renderer->a = a;
  2284     if (renderer->SetDrawColor) {
  2285         return renderer->SetDrawColor(renderer);
  2286     } else {
  2287         return 0;
  2288     }
  2289 }
  2290 
  2291 int
  2292 SDL_GetRenderDrawColor(Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a)
  2293 {
  2294     SDL_Renderer *renderer;
  2295 
  2296     renderer = SDL_GetCurrentRenderer();
  2297     if (!renderer) {
  2298         return -1;
  2299     }
  2300     if (r) {
  2301         *r = renderer->r;
  2302     }
  2303     if (g) {
  2304         *g = renderer->g;
  2305     }
  2306     if (b) {
  2307         *b = renderer->b;
  2308     }
  2309     if (a) {
  2310         *a = renderer->a;
  2311     }
  2312     return 0;
  2313 }
  2314 
  2315 int
  2316 SDL_SetRenderDrawBlendMode(int blendMode)
  2317 {
  2318     SDL_Renderer *renderer;
  2319 
  2320     renderer = SDL_GetCurrentRenderer();
  2321     if (!renderer) {
  2322         return -1;
  2323     }
  2324     renderer->blendMode = blendMode;
  2325     if (renderer->SetDrawBlendMode) {
  2326         return renderer->SetDrawBlendMode(renderer);
  2327     } else {
  2328         return 0;
  2329     }
  2330 }
  2331 
  2332 int
  2333 SDL_GetRenderDrawBlendMode(int *blendMode)
  2334 {
  2335     SDL_Renderer *renderer;
  2336 
  2337     renderer = SDL_GetCurrentRenderer();
  2338     if (!renderer) {
  2339         return -1;
  2340     }
  2341     *blendMode = renderer->blendMode;
  2342     return 0;
  2343 }
  2344 
  2345 int
  2346 SDL_RenderPoint(int x, int y)
  2347 {
  2348     SDL_Renderer *renderer;
  2349     SDL_Window *window;
  2350 
  2351     renderer = SDL_GetCurrentRenderer();
  2352     if (!renderer) {
  2353         return -1;
  2354     }
  2355     if (!renderer->RenderPoint) {
  2356         SDL_Unsupported();
  2357         return -1;
  2358     }
  2359     window = SDL_GetWindowFromID(renderer->window);
  2360     if (x < 0 || y < 0 || x >= window->w || y >= window->h) {
  2361         return 0;
  2362     }
  2363     return renderer->RenderPoint(renderer, x, y);
  2364 }
  2365 
  2366 int
  2367 SDL_RenderLine(int x1, int y1, int x2, int y2)
  2368 {
  2369     SDL_Renderer *renderer;
  2370     SDL_Window *window;
  2371     SDL_Rect real_rect;
  2372 
  2373     if (x1 == x2 && y1 == y2) {
  2374         return SDL_RenderPoint(x1, y1);
  2375     }
  2376 
  2377     renderer = SDL_GetCurrentRenderer();
  2378     if (!renderer) {
  2379         return -1;
  2380     }
  2381     if (!renderer->RenderLine) {
  2382         SDL_Unsupported();
  2383         return -1;
  2384     }
  2385     window = SDL_GetWindowFromID(renderer->window);
  2386 
  2387     real_rect.x = 0;
  2388     real_rect.y = 0;
  2389     real_rect.w = window->w;
  2390     real_rect.h = window->h;
  2391     if (!SDL_IntersectRectAndLine(&real_rect, &x1, &y1, &x2, &y2)) {
  2392         return (0);
  2393     }
  2394     return renderer->RenderLine(renderer, x1, y1, x2, y2);
  2395 }
  2396 
  2397 int
  2398 SDL_RenderFill(const SDL_Rect * rect)
  2399 {
  2400     SDL_Renderer *renderer;
  2401     SDL_Window *window;
  2402     SDL_Rect real_rect;
  2403 
  2404     renderer = SDL_GetCurrentRenderer();
  2405     if (!renderer) {
  2406         return -1;
  2407     }
  2408     if (!renderer->RenderFill) {
  2409         SDL_Unsupported();
  2410         return -1;
  2411     }
  2412     window = SDL_GetWindowFromID(renderer->window);
  2413 
  2414     real_rect.x = 0;
  2415     real_rect.y = 0;
  2416     real_rect.w = window->w;
  2417     real_rect.h = window->h;
  2418     if (rect) {
  2419         if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
  2420             return 0;
  2421         }
  2422     }
  2423     return renderer->RenderFill(renderer, &real_rect);
  2424 }
  2425 
  2426 int
  2427 SDL_RenderCopy(SDL_TextureID textureID, const SDL_Rect * srcrect,
  2428                const SDL_Rect * dstrect)
  2429 {
  2430     SDL_Texture *texture = SDL_GetTextureFromID(textureID);
  2431     SDL_Renderer *renderer;
  2432     SDL_Window *window;
  2433     SDL_Rect real_srcrect;
  2434     SDL_Rect real_dstrect;
  2435 
  2436     renderer = SDL_GetCurrentRenderer();
  2437     if (!renderer) {
  2438         return -1;
  2439     }
  2440     if (!texture) {
  2441         SDL_SetError("Texture not found");
  2442         return -1;
  2443     }
  2444     if (texture->renderer != renderer) {
  2445         SDL_SetError("Texture was not created with this renderer");
  2446         return -1;
  2447     }
  2448     if (!renderer->RenderCopy) {
  2449         SDL_Unsupported();
  2450         return -1;
  2451     }
  2452     window = SDL_GetWindowFromID(renderer->window);
  2453 
  2454     real_srcrect.x = 0;
  2455     real_srcrect.y = 0;
  2456     real_srcrect.w = texture->w;
  2457     real_srcrect.h = texture->h;
  2458     if (srcrect) {
  2459         if (!SDL_IntersectRect(srcrect, &real_srcrect, &real_srcrect)) {
  2460             return 0;
  2461         }
  2462     }
  2463 
  2464     real_dstrect.x = 0;
  2465     real_dstrect.y = 0;
  2466     real_dstrect.w = window->w;
  2467     real_dstrect.h = window->h;
  2468     if (dstrect) {
  2469         if (!SDL_IntersectRect(dstrect, &real_dstrect, &real_dstrect)) {
  2470             return 0;
  2471         }
  2472         /* Clip srcrect by the same amount as dstrect was clipped */
  2473         if (dstrect->w != real_dstrect.w) {
  2474             int deltax = (real_dstrect.x - dstrect->x);
  2475             int deltaw = (real_dstrect.w - dstrect->w);
  2476             real_srcrect.x += (deltax * real_srcrect.w) / dstrect->w;
  2477             real_srcrect.w += (deltaw * real_srcrect.w) / dstrect->w;
  2478         }
  2479         if (dstrect->h != real_dstrect.h) {
  2480             int deltay = (real_dstrect.y - dstrect->y);
  2481             int deltah = (real_dstrect.h - dstrect->h);
  2482             real_srcrect.y += (deltay * real_srcrect.h) / dstrect->h;
  2483             real_srcrect.h += (deltah * real_srcrect.h) / dstrect->h;
  2484         }
  2485     }
  2486 
  2487     return renderer->RenderCopy(renderer, texture, &real_srcrect,
  2488                                 &real_dstrect);
  2489 }
  2490 
  2491 void
  2492 SDL_RenderPresent(void)
  2493 {
  2494     SDL_Renderer *renderer;
  2495 
  2496     renderer = SDL_GetCurrentRenderer();
  2497     if (!renderer || !renderer->RenderPresent) {
  2498         return;
  2499     }
  2500     renderer->RenderPresent(renderer);
  2501 }
  2502 
  2503 void
  2504 SDL_DestroyTexture(SDL_TextureID textureID)
  2505 {
  2506     int hash;
  2507     SDL_Texture *prev, *texture;
  2508     SDL_Renderer *renderer;
  2509 
  2510     if (!_this) {
  2511         SDL_UninitializedVideo();
  2512         return;
  2513     }
  2514     /* Look up the texture in the hash table */
  2515     hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
  2516     prev = NULL;
  2517     for (texture = SDL_CurrentDisplay.textures[hash]; texture;
  2518          prev = texture, texture = texture->next) {
  2519         if (texture->id == textureID) {
  2520             break;
  2521         }
  2522     }
  2523     if (!texture) {
  2524         return;
  2525     }
  2526     /* Unlink the texture from the list */
  2527     if (prev) {
  2528         prev->next = texture->next;
  2529     } else {
  2530         SDL_CurrentDisplay.textures[hash] = texture->next;
  2531     }
  2532 
  2533     /* Free the texture */
  2534     renderer = texture->renderer;
  2535     renderer->DestroyTexture(renderer, texture);
  2536     SDL_free(texture);
  2537 }
  2538 
  2539 void
  2540 SDL_DestroyRenderer(SDL_WindowID windowID)
  2541 {
  2542     SDL_Window *window = SDL_GetWindowFromID(windowID);
  2543     SDL_Renderer *renderer;
  2544     int i;
  2545 
  2546     if (!window) {
  2547         return;
  2548     }
  2549     renderer = window->renderer;
  2550     if (!renderer) {
  2551         return;
  2552     }
  2553     /* Free existing textures for this renderer */
  2554     for (i = 0; i < SDL_arraysize(SDL_CurrentDisplay.textures); ++i) {
  2555         SDL_Texture *texture;
  2556         SDL_Texture *prev = NULL;
  2557         SDL_Texture *next;
  2558         for (texture = SDL_CurrentDisplay.textures[i]; texture;
  2559              texture = next) {
  2560             next = texture->next;
  2561             if (texture->renderer == renderer) {
  2562                 if (prev) {
  2563                     prev->next = next;
  2564                 } else {
  2565                     SDL_CurrentDisplay.textures[i] = next;
  2566                 }
  2567                 renderer->DestroyTexture(renderer, texture);
  2568                 SDL_free(texture);
  2569             } else {
  2570                 prev = texture;
  2571             }
  2572         }
  2573     }
  2574 
  2575     /* Free the renderer instance */
  2576     renderer->DestroyRenderer(renderer);
  2577 
  2578     /* Clear references */
  2579     window->renderer = NULL;
  2580     if (SDL_CurrentDisplay.current_renderer == renderer) {
  2581         SDL_CurrentDisplay.current_renderer = NULL;
  2582     }
  2583 }
  2584 
  2585 SDL_bool
  2586 SDL_IsScreenSaverEnabled()
  2587 {
  2588     if (!_this) {
  2589         return SDL_TRUE;
  2590     }
  2591     return _this->suspend_screensaver ? SDL_FALSE : SDL_TRUE;
  2592 }
  2593 
  2594 void
  2595 SDL_EnableScreenSaver()
  2596 {
  2597     if (!_this) {
  2598         return;
  2599     }
  2600     if (!_this->suspend_screensaver) {
  2601         return;
  2602     }
  2603     _this->suspend_screensaver = SDL_FALSE;
  2604     if (_this->SuspendScreenSaver) {
  2605         _this->SuspendScreenSaver(_this);
  2606     }
  2607 }
  2608 
  2609 void
  2610 SDL_DisableScreenSaver()
  2611 {
  2612     if (!_this) {
  2613         return;
  2614     }
  2615     if (_this->suspend_screensaver) {
  2616         return;
  2617     }
  2618     _this->suspend_screensaver = SDL_TRUE;
  2619     if (_this->SuspendScreenSaver) {
  2620         _this->SuspendScreenSaver(_this);
  2621     }
  2622 }
  2623 
  2624 void
  2625 SDL_VideoQuit(void)
  2626 {
  2627     int i, j;
  2628 
  2629     if (!_this) {
  2630         return;
  2631     }
  2632     /* Halt event processing before doing anything else */
  2633     SDL_StopEventLoop();
  2634     SDL_EnableScreenSaver();
  2635 
  2636     /* Clean up the system video */
  2637     for (i = _this->num_displays; i--;) {
  2638         SDL_VideoDisplay *display = &_this->displays[i];
  2639         for (j = display->num_windows; j--;) {
  2640             SDL_DestroyWindow(display->windows[i].id);
  2641         }
  2642         if (display->windows) {
  2643             SDL_free(display->windows);
  2644             display->windows = NULL;
  2645         }
  2646         display->num_windows = 0;
  2647         if (display->render_drivers) {
  2648             SDL_free(display->render_drivers);
  2649             display->render_drivers = NULL;
  2650         }
  2651         display->num_render_drivers = 0;
  2652     }
  2653     _this->VideoQuit(_this);
  2654 
  2655     for (i = _this->num_displays; i--;) {
  2656         SDL_VideoDisplay *display = &_this->displays[i];
  2657         for (j = display->num_display_modes; j--;) {
  2658             if (display->display_modes[j].driverdata) {
  2659                 SDL_free(display->display_modes[j].driverdata);
  2660                 display->display_modes[j].driverdata = NULL;
  2661             }
  2662         }
  2663         if (display->display_modes) {
  2664             SDL_free(display->display_modes);
  2665             display->display_modes = NULL;
  2666         }
  2667         if (display->desktop_mode.driverdata) {
  2668             SDL_free(display->desktop_mode.driverdata);
  2669             display->desktop_mode.driverdata = NULL;
  2670         }
  2671         if (display->palette) {
  2672             SDL_FreePalette(display->palette);
  2673             display->palette = NULL;
  2674         }
  2675         if (display->gamma) {
  2676             SDL_free(display->gamma);
  2677             display->gamma = NULL;
  2678         }
  2679         if (display->driverdata) {
  2680             SDL_free(display->driverdata);
  2681             display->driverdata = NULL;
  2682         }
  2683     }
  2684     if (_this->displays) {
  2685         SDL_free(_this->displays);
  2686         _this->displays = NULL;
  2687     }
  2688     _this->free(_this);
  2689     _this = NULL;
  2690 }
  2691 
  2692 int
  2693 SDL_GL_LoadLibrary(const char *path)
  2694 {
  2695     int retval;
  2696 
  2697     if (!_this) {
  2698         SDL_UninitializedVideo();
  2699         return -1;
  2700     }
  2701     if (_this->gl_config.driver_loaded) {
  2702         if (path && SDL_strcmp(path, _this->gl_config.driver_path) != 0) {
  2703             SDL_SetError("OpenGL library already loaded");
  2704             return -1;
  2705         }
  2706         retval = 0;
  2707     } else {
  2708         if (!_this->GL_LoadLibrary) {
  2709             SDL_SetError("No dynamic GL support in video driver");
  2710             return -1;
  2711         }
  2712         retval = _this->GL_LoadLibrary(_this, path);
  2713     }
  2714     if (retval == 0) {
  2715         ++_this->gl_config.driver_loaded;
  2716     }
  2717     return (retval);
  2718 }
  2719 
  2720 void *
  2721 SDL_GL_GetProcAddress(const char *proc)
  2722 {
  2723     void *func;
  2724 
  2725     if (!_this) {
  2726         SDL_UninitializedVideo();
  2727         return NULL;
  2728     }
  2729     func = NULL;
  2730     if (_this->GL_GetProcAddress) {
  2731         if (_this->gl_config.driver_loaded) {
  2732             func = _this->GL_GetProcAddress(_this, proc);
  2733         } else {
  2734             SDL_SetError("No GL driver has been loaded");
  2735         }
  2736     } else {
  2737         SDL_SetError("No dynamic GL support in video driver");
  2738     }
  2739     return func;
  2740 }
  2741 
  2742 void
  2743 SDL_GL_UnloadLibrary(void)
  2744 {
  2745     if (!_this) {
  2746         SDL_UninitializedVideo();
  2747         return;
  2748     }
  2749     if (_this->gl_config.driver_loaded > 0) {
  2750         if (--_this->gl_config.driver_loaded > 0) {
  2751             return;
  2752         }
  2753         if (_this->GL_UnloadLibrary) {
  2754             _this->GL_UnloadLibrary(_this);
  2755         }
  2756     }
  2757 }
  2758 
  2759 SDL_bool
  2760 SDL_GL_ExtensionSupported(const char *extension)
  2761 {
  2762 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2763     const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
  2764     const char *extensions;
  2765     const char *start;
  2766     const char *where, *terminator;
  2767 
  2768     /* Extension names should not have spaces. */
  2769     where = SDL_strchr(extension, ' ');
  2770     if (where || *extension == '\0') {
  2771         return SDL_FALSE;
  2772     }
  2773     /* See if there's an environment variable override */
  2774     start = SDL_getenv(extension);
  2775     if (start && *start == '0') {
  2776         return SDL_FALSE;
  2777     }
  2778     /* Lookup the available extensions */
  2779     glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
  2780     if (glGetStringFunc) {
  2781         extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
  2782     } else {
  2783         extensions = NULL;
  2784     }
  2785     if (!extensions) {
  2786         return SDL_FALSE;
  2787     }
  2788     /*
  2789      * It takes a bit of care to be fool-proof about parsing the OpenGL
  2790      * extensions string. Don't be fooled by sub-strings, etc.
  2791      */
  2792 
  2793     start = extensions;
  2794 
  2795     for (;;) {
  2796         where = SDL_strstr(start, extension);
  2797         if (!where)
  2798             break;
  2799 
  2800         terminator = where + SDL_strlen(extension);
  2801         if (where == start || *(where - 1) == ' ')
  2802             if (*terminator == ' ' || *terminator == '\0')
  2803                 return SDL_TRUE;
  2804 
  2805         start = terminator;
  2806     }
  2807     return SDL_FALSE;
  2808 #else
  2809     return SDL_FALSE;
  2810 #endif
  2811 }
  2812 
  2813 int
  2814 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
  2815 {
  2816 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2817     int retval;
  2818 
  2819     if (!_this) {
  2820         SDL_UninitializedVideo();
  2821         return -1;
  2822     }
  2823     retval = 0;
  2824     switch (attr) {
  2825     case SDL_GL_RED_SIZE:
  2826         _this->gl_config.red_size = value;
  2827         break;
  2828     case SDL_GL_GREEN_SIZE:
  2829         _this->gl_config.green_size = value;
  2830         break;
  2831     case SDL_GL_BLUE_SIZE:
  2832         _this->gl_config.blue_size = value;
  2833         break;
  2834     case SDL_GL_ALPHA_SIZE:
  2835         _this->gl_config.alpha_size = value;
  2836         break;
  2837     case SDL_GL_DOUBLEBUFFER:
  2838         _this->gl_config.double_buffer = value;
  2839         break;
  2840     case SDL_GL_BUFFER_SIZE:
  2841         _this->gl_config.buffer_size = value;
  2842         break;
  2843     case SDL_GL_DEPTH_SIZE:
  2844         _this->gl_config.depth_size = value;
  2845         break;
  2846     case SDL_GL_STENCIL_SIZE:
  2847         _this->gl_config.stencil_size = value;
  2848         break;
  2849     case SDL_GL_ACCUM_RED_SIZE:
  2850         _this->gl_config.accum_red_size = value;
  2851         break;
  2852     case SDL_GL_ACCUM_GREEN_SIZE:
  2853         _this->gl_config.accum_green_size = value;
  2854         break;
  2855     case SDL_GL_ACCUM_BLUE_SIZE:
  2856         _this->gl_config.accum_blue_size = value;
  2857         break;
  2858     case SDL_GL_ACCUM_ALPHA_SIZE:
  2859         _this->gl_config.accum_alpha_size = value;
  2860         break;
  2861     case SDL_GL_STEREO:
  2862         _this->gl_config.stereo = value;
  2863         break;
  2864     case SDL_GL_MULTISAMPLEBUFFERS:
  2865         _this->gl_config.multisamplebuffers = value;
  2866         break;
  2867     case SDL_GL_MULTISAMPLESAMPLES:
  2868         _this->gl_config.multisamplesamples = value;
  2869         break;
  2870     case SDL_GL_ACCELERATED_VISUAL:
  2871         _this->gl_config.accelerated = value;
  2872         break;
  2873     case SDL_GL_RETAINED_BACKING:
  2874         _this->gl_config.retained_backing = value;
  2875         break;
  2876     case SDL_GL_CONTEXT_MAJOR_VERSION:
  2877         _this->gl_config.major_version = value;
  2878         break;
  2879     case SDL_GL_CONTEXT_MINOR_VERSION:
  2880         _this->gl_config.minor_version = value;
  2881         break;
  2882     default:
  2883         SDL_SetError("Unknown OpenGL attribute");
  2884         retval = -1;
  2885         break;
  2886     }
  2887     return retval;
  2888 #else
  2889     SDL_Unsupported();
  2890     return -1;
  2891 #endif /* SDL_VIDEO_OPENGL */
  2892 }
  2893 
  2894 int
  2895 SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
  2896 {
  2897 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
  2898     void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2899     GLenum(APIENTRY * glGetErrorFunc) (void);
  2900     GLenum attrib = 0;
  2901     GLenum error = 0;
  2902 
  2903     glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2904     if (!glGetIntegervFunc) {
  2905         return -1;
  2906     }
  2907 
  2908     glGetErrorFunc = SDL_GL_GetProcAddress("glGetError");
  2909     if (!glGetErrorFunc) {
  2910         return -1;
  2911     }
  2912 
  2913     /* Clear value in any case */
  2914     *value = 0;
  2915 
  2916     switch (attr) {
  2917     case SDL_GL_RETAINED_BACKING:
  2918         *value = _this->gl_config.retained_backing;
  2919         return 0;
  2920     case SDL_GL_RED_SIZE:
  2921         attrib = GL_RED_BITS;
  2922         break;
  2923     case SDL_GL_BLUE_SIZE:
  2924         attrib = GL_BLUE_BITS;
  2925         break;
  2926     case SDL_GL_GREEN_SIZE:
  2927         attrib = GL_GREEN_BITS;
  2928         break;
  2929     case SDL_GL_ALPHA_SIZE:
  2930         attrib = GL_ALPHA_BITS;
  2931         break;
  2932     case SDL_GL_DOUBLEBUFFER:
  2933 #ifndef SDL_VIDEO_OPENGL_ES
  2934         attrib = GL_DOUBLEBUFFER;
  2935         break;
  2936 #else
  2937         /* OpenGL ES 1.0 and above specifications have EGL_SINGLE_BUFFER      */
  2938         /* parameter which switches double buffer to single buffer. OpenGL ES */
  2939         /* SDL driver must set proper value after initialization              */
  2940         *value = _this->gl_config.double_buffer;
  2941         return 0;
  2942 #endif
  2943     case SDL_GL_DEPTH_SIZE:
  2944         attrib = GL_DEPTH_BITS;
  2945         break;
  2946     case SDL_GL_STENCIL_SIZE:
  2947         attrib = GL_STENCIL_BITS;
  2948         break;
  2949 #ifndef SDL_VIDEO_OPENGL_ES
  2950     case SDL_GL_ACCUM_RED_SIZE:
  2951         attrib = GL_ACCUM_RED_BITS;
  2952         break;
  2953     case SDL_GL_ACCUM_GREEN_SIZE:
  2954         attrib = GL_ACCUM_GREEN_BITS;
  2955         break;
  2956     case SDL_GL_ACCUM_BLUE_SIZE:
  2957         attrib = GL_ACCUM_BLUE_BITS;
  2958         break;
  2959     case SDL_GL_ACCUM_ALPHA_SIZE:
  2960         attrib = GL_ACCUM_ALPHA_BITS;
  2961         break;
  2962     case SDL_GL_STEREO:
  2963         attrib = GL_STEREO;
  2964         break;
  2965 #else
  2966     case SDL_GL_ACCUM_RED_SIZE:
  2967     case SDL_GL_ACCUM_GREEN_SIZE:
  2968     case SDL_GL_ACCUM_BLUE_SIZE:
  2969     case SDL_GL_ACCUM_ALPHA_SIZE:
  2970     case SDL_GL_STEREO:
  2971         /* none of these are supported in OpenGL ES */
  2972         *value = 0;
  2973         return 0;
  2974 #endif
  2975     case SDL_GL_MULTISAMPLEBUFFERS:
  2976 #ifndef SDL_VIDEO_OPENGL_ES
  2977         attrib = GL_SAMPLE_BUFFERS_ARB;
  2978 #else
  2979         attrib = GL_SAMPLE_BUFFERS;
  2980 #endif
  2981         break;
  2982     case SDL_GL_MULTISAMPLESAMPLES:
  2983 #ifndef SDL_VIDEO_OPENGL_ES
  2984         attrib = GL_SAMPLES_ARB;
  2985 #else
  2986         attrib = GL_SAMPLES;
  2987 #endif
  2988         break;
  2989     case SDL_GL_BUFFER_SIZE:
  2990         {
  2991             GLint bits = 0;
  2992             GLint component;
  2993 
  2994             /*
  2995              * there doesn't seem to be a single flag in OpenGL
  2996              * for this!
  2997              */
  2998             glGetIntegervFunc(GL_RED_BITS, &component);
  2999             bits += component;
  3000             glGetIntegervFunc(GL_GREEN_BITS, &component);
  3001             bits += component;
  3002             glGetIntegervFunc(GL_BLUE_BITS, &component);
  3003             bits += component;
  3004             glGetIntegervFunc(GL_ALPHA_BITS, &component);
  3005             bits += component;
  3006 
  3007             *value = bits;
  3008             return 0;
  3009         }
  3010     case SDL_GL_ACCELERATED_VISUAL:
  3011         {
  3012             /* FIXME: How do we get this information? */
  3013             *value = (_this->gl_config.accelerated != 0);
  3014             return 0;
  3015         }
  3016     default:
  3017         SDL_SetError("Unknown OpenGL attribute");
  3018         return -1;
  3019     }
  3020 
  3021     glGetIntegervFunc(attrib, (GLint *) value);
  3022     error = glGetErrorFunc();
  3023     if (error != GL_NO_ERROR) {
  3024         switch (error) {
  3025         case GL_INVALID_ENUM:
  3026             {
  3027                 SDL_SetError("OpenGL error: GL_INVALID_ENUM");
  3028             }
  3029             break;
  3030         case GL_INVALID_VALUE:
  3031             {
  3032                 SDL_SetError("OpenGL error: GL_INVALID_VALUE");
  3033             }
  3034             break;
  3035         default:
  3036             {
  3037                 SDL_SetError("OpenGL error: %08X", error);
  3038             }
  3039             break;
  3040         }
  3041         return -1;
  3042     }
  3043     return 0;
  3044 #else
  3045     SDL_Unsupported();
  3046     return -1;
  3047 #endif /* SDL_VIDEO_OPENGL */
  3048 }
  3049 
  3050 SDL_GLContext
  3051 SDL_GL_CreateContext(SDL_WindowID windowID)
  3052 {
  3053     SDL_Window *window = SDL_GetWindowFromID(windowID);
  3054 
  3055     if (!window) {
  3056         return NULL;
  3057     }
  3058     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  3059         SDL_SetError("The specified window isn't an OpenGL window");
  3060         return NULL;
  3061     }
  3062     return _this->GL_CreateContext(_this, window);
  3063 }
  3064 
  3065 int
  3066 SDL_GL_MakeCurrent(SDL_WindowID windowID, SDL_GLContext context)
  3067 {
  3068     SDL_Window *window = SDL_GetWindowFromID(windowID);
  3069 
  3070     if (window && !(window->flags & SDL_WINDOW_OPENGL)) {
  3071         SDL_SetError("The specified window isn't an OpenGL window");
  3072         return -1;
  3073     }
  3074     if (!context) {
  3075         window = NULL;
  3076     }
  3077     return _this->GL_MakeCurrent(_this, window, context);
  3078 }
  3079 
  3080 int
  3081 SDL_GL_SetSwapInterval(int interval)
  3082 {
  3083     if (!_this) {
  3084         SDL_UninitializedVideo();
  3085         return -1;
  3086     }
  3087     if (_this->GL_SetSwapInterval) {
  3088         return _this->GL_SetSwapInterval(_this, interval);
  3089     } else {
  3090         SDL_SetError("Setting the swap interval is not supported");
  3091         return -1;
  3092     }
  3093 }
  3094 
  3095 int
  3096 SDL_GL_GetSwapInterval(void)
  3097 {
  3098     if (!_this) {
  3099         SDL_UninitializedVideo();
  3100         return -1;
  3101     }
  3102     if (_this->GL_GetSwapInterval) {
  3103         return _this->GL_GetSwapInterval(_this);
  3104     } else {
  3105         SDL_SetError("Getting the swap interval is not supported");
  3106         return -1;
  3107     }
  3108 }
  3109 
  3110 void
  3111 SDL_GL_SwapWindow(SDL_WindowID windowID)
  3112 {
  3113     SDL_Window *window = SDL_GetWindowFromID(windowID);
  3114 
  3115     if (!window) {
  3116         return;
  3117     }
  3118     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  3119         SDL_SetError("The specified window isn't an OpenGL window");
  3120         return;
  3121     }
  3122     _this->GL_SwapWindow(_this, window);
  3123 }
  3124 
  3125 void
  3126 SDL_GL_DeleteContext(SDL_GLContext context)
  3127 {
  3128     if (!_this || !context) {
  3129         return;
  3130     }
  3131     _this->GL_MakeCurrent(_this, NULL, NULL);
  3132     _this->GL_DeleteContext(_this, context);
  3133 }
  3134 
  3135 #if 0                           // FIXME
  3136 /*
  3137  * Utility function used by SDL_WM_SetIcon(); flags & 1 for color key, flags
  3138  * & 2 for alpha channel.
  3139  */
  3140 static void
  3141 CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
  3142 {
  3143     int x, y;
  3144     Uint32 colorkey;
  3145 #define SET_MASKBIT(icon, x, y, mask) \
  3146 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  3147 
  3148     colorkey = icon->format->colorkey;
  3149     switch (icon->format->BytesPerPixel) {
  3150     case 1:
  3151         {
  3152             Uint8 *pixels;
  3153             for (y = 0; y < icon->h; ++y) {
  3154                 pixels = (Uint8 *) icon->pixels + y * icon->pitch;
  3155                 for (x = 0; x < icon->w; ++x) {
  3156                     if (*pixels++ == colorkey) {
  3157                         SET_MASKBIT(icon, x, y, mask);
  3158                     }
  3159                 }
  3160             }
  3161         }
  3162         break;
  3163 
  3164     case 2:
  3165         {
  3166             Uint16 *pixels;
  3167             for (y = 0; y < icon->h; ++y) {
  3168                 pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
  3169                 for (x = 0; x < icon->w; ++x) {
  3170                     if ((flags & 1) && *pixels == colorkey) {
  3171                         SET_MASKBIT(icon, x, y, mask);
  3172                     } else if ((flags & 2)
  3173                                && (*pixels & icon->format->Amask) == 0) {
  3174                         SET_MASKBIT(icon, x, y, mask);
  3175                     }
  3176                     pixels++;
  3177                 }
  3178             }
  3179         }
  3180         break;
  3181 
  3182     case 4:
  3183         {
  3184             Uint32 *pixels;
  3185             for (y = 0; y < icon->h; ++y) {
  3186                 pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
  3187                 for (x = 0; x < icon->w; ++x) {
  3188                     if ((flags & 1) && *pixels == colorkey) {
  3189                         SET_MASKBIT(icon, x, y, mask);
  3190                     } else if ((flags & 2)
  3191                                && (*pixels & icon->format->Amask) == 0) {
  3192                         SET_MASKBIT(icon, x, y, mask);
  3193                     }
  3194                     pixels++;
  3195                 }
  3196             }
  3197         }
  3198         break;
  3199     }
  3200 }
  3201 
  3202 /*
  3203  * Sets the window manager icon for the display window.
  3204  */
  3205 void
  3206 SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
  3207 {
  3208     if (icon && _this->SetIcon) {
  3209         /* Generate a mask if necessary, and create the icon! */
  3210         if (mask == NULL) {
  3211             int mask_len = icon->h * (icon->w + 7) / 8;
  3212             int flags = 0;
  3213             mask = (Uint8 *) SDL_malloc(mask_len);
  3214             if (mask == NULL) {
  3215                 return;
  3216             }
  3217             SDL_memset(mask, ~0, mask_len);
  3218             if (icon->flags & SDL_SRCCOLORKEY)
  3219                 flags |= 1;
  3220             if (icon->flags & SDL_SRCALPHA)
  3221                 flags |= 2;
  3222             if (flags) {
  3223                 CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  3224             }
  3225             _this->SetIcon(_this, icon, mask);
  3226             SDL_free(mask);
  3227         } else {
  3228             _this->SetIcon(_this, icon, mask);
  3229         }
  3230     }
  3231 }
  3232 #endif
  3233 
  3234 SDL_bool
  3235 SDL_GetWindowWMInfo(SDL_WindowID windowID, struct SDL_SysWMinfo *info)
  3236 {
  3237     SDL_Window *window = SDL_GetWindowFromID(windowID);
  3238 
  3239     if (!window || !_this->GetWindowWMInfo) {
  3240         return SDL_FALSE;
  3241     }
  3242     return (_this->GetWindowWMInfo(_this, window, info));
  3243 }
  3244 
  3245 void
  3246 SDL_StartTextInput(void)
  3247 {
  3248     if (_this->StartTextInput) {
  3249         _this->StartTextInput(_this);
  3250     }
  3251     SDL_EventState(SDL_TEXTINPUT, SDL_ENABLE);
  3252     SDL_EventState(SDL_TEXTEDITING, SDL_ENABLE);
  3253 }
  3254 
  3255 void
  3256 SDL_StopTextInput(void)
  3257 {
  3258     if (_this->StopTextInput) {
  3259         _this->StopTextInput(_this);
  3260     }
  3261     SDL_EventState(SDL_TEXTINPUT, SDL_DISABLE);
  3262     SDL_EventState(SDL_TEXTEDITING, SDL_DISABLE);
  3263 }
  3264 
  3265 void
  3266 SDL_SetTextInputRect(SDL_Rect *rect)
  3267 {
  3268     if (_this->SetTextInputRect) {
  3269         _this->SetTextInputRect(_this, rect);
  3270     }
  3271 }
  3272 
  3273 /* vi: set ts=4 sw=4 expandtab: */