src/video/SDL_video.c
author Ryan C. Gordon <icculus@icculus.org>
Fri, 10 Apr 2015 21:40:50 -0400
changeset 9546 d997877cdad7
parent 9537 ff30c198864e
child 9589 a583c42c51d7
permissions -rw-r--r--
Placate static analysis with an assertion.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "../SDL_internal.h"
    22 
    23 /* The high-level video driver subsystem */
    24 
    25 #include "SDL.h"
    26 #include "SDL_video.h"
    27 #include "SDL_sysvideo.h"
    28 #include "SDL_blit.h"
    29 #include "SDL_pixels_c.h"
    30 #include "SDL_rect_c.h"
    31 #include "../events/SDL_events_c.h"
    32 #include "../timer/SDL_timer_c.h"
    33 
    34 #include "SDL_syswm.h"
    35 
    36 #if SDL_VIDEO_OPENGL
    37 #include "SDL_opengl.h"
    38 #endif /* SDL_VIDEO_OPENGL */
    39 
    40 #if SDL_VIDEO_OPENGL_ES
    41 #include "SDL_opengles.h"
    42 #endif /* SDL_VIDEO_OPENGL_ES */
    43 
    44 /* GL and GLES2 headers conflict on Linux 32 bits */
    45 #if SDL_VIDEO_OPENGL_ES2 && !SDL_VIDEO_OPENGL
    46 #include "SDL_opengles2.h"
    47 #endif /* SDL_VIDEO_OPENGL_ES2 && !SDL_VIDEO_OPENGL */
    48 
    49 #ifndef GL_CONTEXT_RELEASE_BEHAVIOR_KHR
    50 #define GL_CONTEXT_RELEASE_BEHAVIOR_KHR 0x82FB
    51 #endif
    52 
    53 /* On Windows, windows.h defines CreateWindow */
    54 #ifdef CreateWindow
    55 #undef CreateWindow
    56 #endif
    57 
    58 /* Available video drivers */
    59 static VideoBootStrap *bootstrap[] = {
    60 #if SDL_VIDEO_DRIVER_COCOA
    61     &COCOA_bootstrap,
    62 #endif
    63 #if SDL_VIDEO_DRIVER_X11
    64     &X11_bootstrap,
    65 #endif
    66 #if SDL_VIDEO_DRIVER_MIR
    67     &MIR_bootstrap,
    68 #endif
    69 #if SDL_VIDEO_DRIVER_WAYLAND
    70     &Wayland_bootstrap,
    71 #endif
    72 #if SDL_VIDEO_DRIVER_VIVANTE
    73     &VIVANTE_bootstrap,
    74 #endif
    75 #if SDL_VIDEO_DRIVER_DIRECTFB
    76     &DirectFB_bootstrap,
    77 #endif
    78 #if SDL_VIDEO_DRIVER_WINDOWS
    79     &WINDOWS_bootstrap,
    80 #endif
    81 #if SDL_VIDEO_DRIVER_WINRT
    82     &WINRT_bootstrap,
    83 #endif
    84 #if SDL_VIDEO_DRIVER_HAIKU
    85     &HAIKU_bootstrap,
    86 #endif
    87 #if SDL_VIDEO_DRIVER_PANDORA
    88     &PND_bootstrap,
    89 #endif
    90 #if SDL_VIDEO_DRIVER_UIKIT
    91     &UIKIT_bootstrap,
    92 #endif
    93 #if SDL_VIDEO_DRIVER_ANDROID
    94     &Android_bootstrap,
    95 #endif
    96 #if SDL_VIDEO_DRIVER_PSP
    97     &PSP_bootstrap,
    98 #endif
    99 #if SDL_VIDEO_DRIVER_RPI
   100     &RPI_bootstrap,
   101 #endif 
   102 #if SDL_VIDEO_DRIVER_NACL
   103     &NACL_bootstrap,
   104 #endif
   105 #if SDL_VIDEO_DRIVER_EMSCRIPTEN
   106     &Emscripten_bootstrap,
   107 #endif
   108 #if SDL_VIDEO_DRIVER_DUMMY
   109     &DUMMY_bootstrap,
   110 #endif
   111     NULL
   112 };
   113 
   114 static SDL_VideoDevice *_this = NULL;
   115 
   116 #define CHECK_WINDOW_MAGIC(window, retval) \
   117     if (!_this) { \
   118         SDL_UninitializedVideo(); \
   119         return retval; \
   120     } \
   121     if (!window || window->magic != &_this->window_magic) { \
   122         SDL_SetError("Invalid window"); \
   123         return retval; \
   124     }
   125 
   126 #define CHECK_DISPLAY_INDEX(displayIndex, retval) \
   127     if (!_this) { \
   128         SDL_UninitializedVideo(); \
   129         return retval; \
   130     } \
   131     SDL_assert(_this->displays != NULL); \
   132     if (displayIndex < 0 || displayIndex >= _this->num_displays) { \
   133         SDL_SetError("displayIndex must be in the range 0 - %d", \
   134                      _this->num_displays - 1); \
   135         return retval; \
   136     }
   137 
   138 #define FULLSCREEN_MASK (SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN)
   139 
   140 #ifdef __MACOSX__
   141 /* Support for Mac OS X fullscreen spaces */
   142 extern SDL_bool Cocoa_IsWindowInFullscreenSpace(SDL_Window * window);
   143 extern SDL_bool Cocoa_SetWindowFullscreenSpace(SDL_Window * window, SDL_bool state);
   144 #endif
   145 
   146 
   147 /* Support for framebuffer emulation using an accelerated renderer */
   148 
   149 #define SDL_WINDOWTEXTUREDATA   "_SDL_WindowTextureData"
   150 
   151 typedef struct {
   152     SDL_Renderer *renderer;
   153     SDL_Texture *texture;
   154     void *pixels;
   155     int pitch;
   156     int bytes_per_pixel;
   157 } SDL_WindowTextureData;
   158 
   159 static SDL_bool
   160 ShouldUseTextureFramebuffer()
   161 {
   162     const char *hint;
   163 
   164     /* If there's no native framebuffer support then there's no option */
   165     if (!_this->CreateWindowFramebuffer) {
   166         return SDL_TRUE;
   167     }
   168 
   169     /* If the user has specified a software renderer we can't use a
   170        texture framebuffer, or renderer creation will go recursive.
   171      */
   172     hint = SDL_GetHint(SDL_HINT_RENDER_DRIVER);
   173     if (hint && SDL_strcasecmp(hint, "software") == 0) {
   174         return SDL_FALSE;
   175     }
   176 
   177     /* See if the user or application wants a specific behavior */
   178     hint = SDL_GetHint(SDL_HINT_FRAMEBUFFER_ACCELERATION);
   179     if (hint) {
   180         if (*hint == '0') {
   181             return SDL_FALSE;
   182         } else {
   183             return SDL_TRUE;
   184         }
   185     }
   186 
   187     /* Each platform has different performance characteristics */
   188 #if defined(__WIN32__)
   189     /* GDI BitBlt() is way faster than Direct3D dynamic textures right now.
   190      */
   191     return SDL_FALSE;
   192 
   193 #elif defined(__MACOSX__)
   194     /* Mac OS X uses OpenGL as the native fast path */
   195     return SDL_TRUE;
   196 
   197 #elif defined(__LINUX__)
   198     /* Properly configured OpenGL drivers are faster than MIT-SHM */
   199 #if SDL_VIDEO_OPENGL
   200     /* Ugh, find a way to cache this value! */
   201     {
   202         SDL_Window *window;
   203         SDL_GLContext context;
   204         SDL_bool hasAcceleratedOpenGL = SDL_FALSE;
   205 
   206         window = SDL_CreateWindow("OpenGL test", -32, -32, 32, 32, SDL_WINDOW_OPENGL|SDL_WINDOW_HIDDEN);
   207         if (window) {
   208             context = SDL_GL_CreateContext(window);
   209             if (context) {
   210                 const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
   211                 const char *vendor = NULL;
   212 
   213                 glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
   214                 if (glGetStringFunc) {
   215                     vendor = (const char *) glGetStringFunc(GL_VENDOR);
   216                 }
   217                 /* Add more vendors here at will... */
   218                 if (vendor &&
   219                     (SDL_strstr(vendor, "ATI Technologies") ||
   220                      SDL_strstr(vendor, "NVIDIA"))) {
   221                     hasAcceleratedOpenGL = SDL_TRUE;
   222                 }
   223                 SDL_GL_DeleteContext(context);
   224             }
   225             SDL_DestroyWindow(window);
   226         }
   227         return hasAcceleratedOpenGL;
   228     }
   229 #elif SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
   230     /* Let's be optimistic about this! */
   231     return SDL_TRUE;
   232 #else
   233     return SDL_FALSE;
   234 #endif
   235 
   236 #else
   237     /* Play it safe, assume that if there is a framebuffer driver that it's
   238        optimized for the current platform.
   239     */
   240     return SDL_FALSE;
   241 #endif
   242 }
   243 
   244 static int
   245 SDL_CreateWindowTexture(SDL_VideoDevice *unused, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
   246 {
   247     SDL_WindowTextureData *data;
   248 
   249     data = SDL_GetWindowData(window, SDL_WINDOWTEXTUREDATA);
   250     if (!data) {
   251         SDL_Renderer *renderer = NULL;
   252         int i;
   253         const char *hint = SDL_GetHint(SDL_HINT_FRAMEBUFFER_ACCELERATION);
   254 
   255         /* Check to see if there's a specific driver requested */
   256         if (hint && *hint != '0' && *hint != '1' &&
   257             SDL_strcasecmp(hint, "software") != 0) {
   258             for (i = 0; i < SDL_GetNumRenderDrivers(); ++i) {
   259                 SDL_RendererInfo info;
   260                 SDL_GetRenderDriverInfo(i, &info);
   261                 if (SDL_strcasecmp(info.name, hint) == 0) {
   262                     renderer = SDL_CreateRenderer(window, i, 0);
   263                     break;
   264                 }
   265             }
   266         }
   267         
   268         if (!renderer) {
   269             for (i = 0; i < SDL_GetNumRenderDrivers(); ++i) {
   270                 SDL_RendererInfo info;
   271                 SDL_GetRenderDriverInfo(i, &info);
   272                 if (SDL_strcmp(info.name, "software") != 0) {
   273                     renderer = SDL_CreateRenderer(window, i, 0);
   274                     if (renderer) {
   275                         break;
   276                     }
   277                 }
   278             }
   279         }
   280         if (!renderer) {
   281             return SDL_SetError("No hardware accelerated renderers available");
   282         }
   283 
   284         /* Create the data after we successfully create the renderer (bug #1116) */
   285         data = (SDL_WindowTextureData *)SDL_calloc(1, sizeof(*data));
   286         if (!data) {
   287             SDL_DestroyRenderer(renderer);
   288             return SDL_OutOfMemory();
   289         }
   290         SDL_SetWindowData(window, SDL_WINDOWTEXTUREDATA, data);
   291 
   292         data->renderer = renderer;
   293     }
   294 
   295     /* Free any old texture and pixel data */
   296     if (data->texture) {
   297         SDL_DestroyTexture(data->texture);
   298         data->texture = NULL;
   299     }
   300     SDL_free(data->pixels);
   301     data->pixels = NULL;
   302 
   303     {
   304         SDL_RendererInfo info;
   305         Uint32 i;
   306 
   307         if (SDL_GetRendererInfo(data->renderer, &info) < 0) {
   308             return -1;
   309         }
   310 
   311         /* Find the first format without an alpha channel */
   312         *format = info.texture_formats[0];
   313 
   314         for (i = 0; i < info.num_texture_formats; ++i) {
   315             if (!SDL_ISPIXELFORMAT_FOURCC(info.texture_formats[i]) &&
   316                     !SDL_ISPIXELFORMAT_ALPHA(info.texture_formats[i])) {
   317                 *format = info.texture_formats[i];
   318                 break;
   319             }
   320         }
   321     }
   322 
   323     data->texture = SDL_CreateTexture(data->renderer, *format,
   324                                       SDL_TEXTUREACCESS_STREAMING,
   325                                       window->w, window->h);
   326     if (!data->texture) {
   327         return -1;
   328     }
   329 
   330     /* Create framebuffer data */
   331     data->bytes_per_pixel = SDL_BYTESPERPIXEL(*format);
   332     data->pitch = (((window->w * data->bytes_per_pixel) + 3) & ~3);
   333     data->pixels = SDL_malloc(window->h * data->pitch);
   334     if (!data->pixels) {
   335         return SDL_OutOfMemory();
   336     }
   337 
   338     *pixels = data->pixels;
   339     *pitch = data->pitch;
   340 
   341     /* Make sure we're not double-scaling the viewport */
   342     SDL_RenderSetViewport(data->renderer, NULL);
   343 
   344     return 0;
   345 }
   346 
   347 static int
   348 SDL_UpdateWindowTexture(SDL_VideoDevice *unused, SDL_Window * window, const SDL_Rect * rects, int numrects)
   349 {
   350     SDL_WindowTextureData *data;
   351     SDL_Rect rect;
   352     void *src;
   353 
   354     data = SDL_GetWindowData(window, SDL_WINDOWTEXTUREDATA);
   355     if (!data || !data->texture) {
   356         return SDL_SetError("No window texture data");
   357     }
   358 
   359     /* Update a single rect that contains subrects for best DMA performance */
   360     if (SDL_GetSpanEnclosingRect(window->w, window->h, numrects, rects, &rect)) {
   361         src = (void *)((Uint8 *)data->pixels +
   362                         rect.y * data->pitch +
   363                         rect.x * data->bytes_per_pixel);
   364         if (SDL_UpdateTexture(data->texture, &rect, src, data->pitch) < 0) {
   365             return -1;
   366         }
   367 
   368         if (SDL_RenderCopy(data->renderer, data->texture, NULL, NULL) < 0) {
   369             return -1;
   370         }
   371 
   372         SDL_RenderPresent(data->renderer);
   373     }
   374     return 0;
   375 }
   376 
   377 static void
   378 SDL_DestroyWindowTexture(SDL_VideoDevice *unused, SDL_Window * window)
   379 {
   380     SDL_WindowTextureData *data;
   381 
   382     data = SDL_SetWindowData(window, SDL_WINDOWTEXTUREDATA, NULL);
   383     if (!data) {
   384         return;
   385     }
   386     if (data->texture) {
   387         SDL_DestroyTexture(data->texture);
   388     }
   389     if (data->renderer) {
   390         SDL_DestroyRenderer(data->renderer);
   391     }
   392     SDL_free(data->pixels);
   393     SDL_free(data);
   394 }
   395 
   396 
   397 static int
   398 cmpmodes(const void *A, const void *B)
   399 {
   400     const SDL_DisplayMode *a = (const SDL_DisplayMode *) A;
   401     const SDL_DisplayMode *b = (const SDL_DisplayMode *) B;
   402     if (a == b) {
   403         return 0;
   404     } else if (a->w != b->w) {
   405         return b->w - a->w;
   406     } else if (a->h != b->h) {
   407         return b->h - a->h;
   408     } else if (SDL_BITSPERPIXEL(a->format) != SDL_BITSPERPIXEL(b->format)) {
   409         return SDL_BITSPERPIXEL(b->format) - SDL_BITSPERPIXEL(a->format);
   410     } else if (SDL_PIXELLAYOUT(a->format) != SDL_PIXELLAYOUT(b->format)) {
   411         return SDL_PIXELLAYOUT(b->format) - SDL_PIXELLAYOUT(a->format);
   412     } else if (a->refresh_rate != b->refresh_rate) {
   413         return b->refresh_rate - a->refresh_rate;
   414     }
   415     return 0;
   416 }
   417 
   418 static int
   419 SDL_UninitializedVideo()
   420 {
   421     return SDL_SetError("Video subsystem has not been initialized");
   422 }
   423 
   424 int
   425 SDL_GetNumVideoDrivers(void)
   426 {
   427     return SDL_arraysize(bootstrap) - 1;
   428 }
   429 
   430 const char *
   431 SDL_GetVideoDriver(int index)
   432 {
   433     if (index >= 0 && index < SDL_GetNumVideoDrivers()) {
   434         return bootstrap[index]->name;
   435     }
   436     return NULL;
   437 }
   438 
   439 /*
   440  * Initialize the video and event subsystems -- determine native pixel format
   441  */
   442 int
   443 SDL_VideoInit(const char *driver_name)
   444 {
   445     SDL_VideoDevice *video;
   446     const char *hint;
   447     int index;
   448     int i;
   449     SDL_bool allow_screensaver;
   450 
   451     /* Check to make sure we don't overwrite '_this' */
   452     if (_this != NULL) {
   453         SDL_VideoQuit();
   454     }
   455 
   456 #if !SDL_TIMERS_DISABLED
   457     SDL_TicksInit();
   458 #endif
   459 
   460     /* Start the event loop */
   461     if (SDL_InitSubSystem(SDL_INIT_EVENTS) < 0 ||
   462         SDL_KeyboardInit() < 0 ||
   463         SDL_MouseInit() < 0 ||
   464         SDL_TouchInit() < 0) {
   465         return -1;
   466     }
   467 
   468     /* Select the proper video driver */
   469     index = 0;
   470     video = NULL;
   471     if (driver_name == NULL) {
   472         driver_name = SDL_getenv("SDL_VIDEODRIVER");
   473     }
   474     if (driver_name != NULL) {
   475         for (i = 0; bootstrap[i]; ++i) {
   476             if (SDL_strncasecmp(bootstrap[i]->name, driver_name, SDL_strlen(driver_name)) == 0) {
   477                 if (bootstrap[i]->available()) {
   478                     video = bootstrap[i]->create(index);
   479                     break;
   480                 }
   481             }
   482         }
   483     } else {
   484         for (i = 0; bootstrap[i]; ++i) {
   485             if (bootstrap[i]->available()) {
   486                 video = bootstrap[i]->create(index);
   487                 if (video != NULL) {
   488                     break;
   489                 }
   490             }
   491         }
   492     }
   493     if (video == NULL) {
   494         if (driver_name) {
   495             return SDL_SetError("%s not available", driver_name);
   496         }
   497         return SDL_SetError("No available video device");
   498     }
   499     _this = video;
   500     _this->name = bootstrap[i]->name;
   501     _this->next_object_id = 1;
   502 
   503 
   504     /* Set some very sane GL defaults */
   505     _this->gl_config.driver_loaded = 0;
   506     _this->gl_config.dll_handle = NULL;
   507     SDL_GL_ResetAttributes();
   508 
   509     _this->current_glwin_tls = SDL_TLSCreate();
   510     _this->current_glctx_tls = SDL_TLSCreate();
   511 
   512     /* Initialize the video subsystem */
   513     if (_this->VideoInit(_this) < 0) {
   514         SDL_VideoQuit();
   515         return -1;
   516     }
   517 
   518     /* Make sure some displays were added */
   519     if (_this->num_displays == 0) {
   520         SDL_VideoQuit();
   521         return SDL_SetError("The video driver did not add any displays");
   522     }
   523 
   524     /* Add the renderer framebuffer emulation if desired */
   525     if (ShouldUseTextureFramebuffer()) {
   526         _this->CreateWindowFramebuffer = SDL_CreateWindowTexture;
   527         _this->UpdateWindowFramebuffer = SDL_UpdateWindowTexture;
   528         _this->DestroyWindowFramebuffer = SDL_DestroyWindowTexture;
   529     }
   530 
   531     /* Disable the screen saver by default. This is a change from <= 2.0.1,
   532        but most things using SDL are games or media players; you wouldn't
   533        want a screensaver to trigger if you're playing exclusively with a
   534        joystick, or passively watching a movie. Things that use SDL but
   535        function more like a normal desktop app should explicitly reenable the
   536        screensaver. */
   537     hint = SDL_GetHint(SDL_HINT_VIDEO_ALLOW_SCREENSAVER);
   538     if (hint) {
   539         allow_screensaver = SDL_atoi(hint) ? SDL_TRUE : SDL_FALSE;
   540     } else {
   541         allow_screensaver = SDL_FALSE;
   542     }
   543     if (!allow_screensaver) {
   544         SDL_DisableScreenSaver();
   545     }
   546 
   547     /* If we don't use a screen keyboard, turn on text input by default,
   548        otherwise programs that expect to get text events without enabling
   549        UNICODE input won't get any events.
   550 
   551        Actually, come to think of it, you needed to call SDL_EnableUNICODE(1)
   552        in SDL 1.2 before you got text input events.  Hmm...
   553      */
   554     if (!SDL_HasScreenKeyboardSupport()) {
   555         SDL_StartTextInput();
   556     }
   557 
   558     /* We're ready to go! */
   559     return 0;
   560 }
   561 
   562 const char *
   563 SDL_GetCurrentVideoDriver()
   564 {
   565     if (!_this) {
   566         SDL_UninitializedVideo();
   567         return NULL;
   568     }
   569     return _this->name;
   570 }
   571 
   572 SDL_VideoDevice *
   573 SDL_GetVideoDevice(void)
   574 {
   575     return _this;
   576 }
   577 
   578 int
   579 SDL_AddBasicVideoDisplay(const SDL_DisplayMode * desktop_mode)
   580 {
   581     SDL_VideoDisplay display;
   582 
   583     SDL_zero(display);
   584     if (desktop_mode) {
   585         display.desktop_mode = *desktop_mode;
   586     }
   587     display.current_mode = display.desktop_mode;
   588 
   589     return SDL_AddVideoDisplay(&display);
   590 }
   591 
   592 int
   593 SDL_AddVideoDisplay(const SDL_VideoDisplay * display)
   594 {
   595     SDL_VideoDisplay *displays;
   596     int index = -1;
   597 
   598     displays =
   599         SDL_realloc(_this->displays,
   600                     (_this->num_displays + 1) * sizeof(*displays));
   601     if (displays) {
   602         index = _this->num_displays++;
   603         displays[index] = *display;
   604         displays[index].device = _this;
   605         _this->displays = displays;
   606 
   607         if (display->name) {
   608             displays[index].name = SDL_strdup(display->name);
   609         } else {
   610             char name[32];
   611 
   612             SDL_itoa(index, name, 10);
   613             displays[index].name = SDL_strdup(name);
   614         }
   615     } else {
   616         SDL_OutOfMemory();
   617     }
   618     return index;
   619 }
   620 
   621 int
   622 SDL_GetNumVideoDisplays(void)
   623 {
   624     if (!_this) {
   625         SDL_UninitializedVideo();
   626         return 0;
   627     }
   628     return _this->num_displays;
   629 }
   630 
   631 static int
   632 SDL_GetIndexOfDisplay(SDL_VideoDisplay *display)
   633 {
   634     int displayIndex;
   635 
   636     for (displayIndex = 0; displayIndex < _this->num_displays; ++displayIndex) {
   637         if (display == &_this->displays[displayIndex]) {
   638             return displayIndex;
   639         }
   640     }
   641 
   642     /* Couldn't find the display, just use index 0 */
   643     return 0;
   644 }
   645 
   646 void *
   647 SDL_GetDisplayDriverData(int displayIndex)
   648 {
   649     CHECK_DISPLAY_INDEX(displayIndex, NULL);
   650 
   651     return _this->displays[displayIndex].driverdata;
   652 }
   653 
   654 const char *
   655 SDL_GetDisplayName(int displayIndex)
   656 {
   657     CHECK_DISPLAY_INDEX(displayIndex, NULL);
   658 
   659     return _this->displays[displayIndex].name;
   660 }
   661 
   662 int
   663 SDL_GetDisplayBounds(int displayIndex, SDL_Rect * rect)
   664 {
   665     CHECK_DISPLAY_INDEX(displayIndex, -1);
   666 
   667     if (rect) {
   668         SDL_VideoDisplay *display = &_this->displays[displayIndex];
   669 
   670         if (_this->GetDisplayBounds) {
   671             if (_this->GetDisplayBounds(_this, display, rect) == 0) {
   672                 return 0;
   673             }
   674         }
   675 
   676         /* Assume that the displays are left to right */
   677         if (displayIndex == 0) {
   678             rect->x = 0;
   679             rect->y = 0;
   680         } else {
   681             SDL_GetDisplayBounds(displayIndex-1, rect);
   682             rect->x += rect->w;
   683         }
   684         rect->w = display->current_mode.w;
   685         rect->h = display->current_mode.h;
   686     }
   687     return 0;
   688 }
   689 
   690 SDL_bool
   691 SDL_AddDisplayMode(SDL_VideoDisplay * display,  const SDL_DisplayMode * mode)
   692 {
   693     SDL_DisplayMode *modes;
   694     int i, nmodes;
   695 
   696     /* Make sure we don't already have the mode in the list */
   697     modes = display->display_modes;
   698     nmodes = display->num_display_modes;
   699     for (i = 0; i < nmodes; ++i) {
   700         if (cmpmodes(mode, &modes[i]) == 0) {
   701             return SDL_FALSE;
   702         }
   703     }
   704 
   705     /* Go ahead and add the new mode */
   706     if (nmodes == display->max_display_modes) {
   707         modes =
   708             SDL_realloc(modes,
   709                         (display->max_display_modes + 32) * sizeof(*modes));
   710         if (!modes) {
   711             return SDL_FALSE;
   712         }
   713         display->display_modes = modes;
   714         display->max_display_modes += 32;
   715     }
   716     modes[nmodes] = *mode;
   717     display->num_display_modes++;
   718 
   719     /* Re-sort video modes */
   720     SDL_qsort(display->display_modes, display->num_display_modes,
   721               sizeof(SDL_DisplayMode), cmpmodes);
   722 
   723     return SDL_TRUE;
   724 }
   725 
   726 static int
   727 SDL_GetNumDisplayModesForDisplay(SDL_VideoDisplay * display)
   728 {
   729     if (!display->num_display_modes && _this->GetDisplayModes) {
   730         _this->GetDisplayModes(_this, display);
   731         SDL_qsort(display->display_modes, display->num_display_modes,
   732                   sizeof(SDL_DisplayMode), cmpmodes);
   733     }
   734     return display->num_display_modes;
   735 }
   736 
   737 int
   738 SDL_GetNumDisplayModes(int displayIndex)
   739 {
   740     CHECK_DISPLAY_INDEX(displayIndex, -1);
   741 
   742     return SDL_GetNumDisplayModesForDisplay(&_this->displays[displayIndex]);
   743 }
   744 
   745 int
   746 SDL_GetDisplayMode(int displayIndex, int index, SDL_DisplayMode * mode)
   747 {
   748     SDL_VideoDisplay *display;
   749 
   750     CHECK_DISPLAY_INDEX(displayIndex, -1);
   751 
   752     display = &_this->displays[displayIndex];
   753     if (index < 0 || index >= SDL_GetNumDisplayModesForDisplay(display)) {
   754         return SDL_SetError("index must be in the range of 0 - %d",
   755                             SDL_GetNumDisplayModesForDisplay(display) - 1);
   756     }
   757     if (mode) {
   758         *mode = display->display_modes[index];
   759     }
   760     return 0;
   761 }
   762 
   763 int
   764 SDL_GetDesktopDisplayMode(int displayIndex, SDL_DisplayMode * mode)
   765 {
   766     SDL_VideoDisplay *display;
   767 
   768     CHECK_DISPLAY_INDEX(displayIndex, -1);
   769 
   770     display = &_this->displays[displayIndex];
   771     if (mode) {
   772         *mode = display->desktop_mode;
   773     }
   774     return 0;
   775 }
   776 
   777 int
   778 SDL_GetCurrentDisplayMode(int displayIndex, SDL_DisplayMode * mode)
   779 {
   780     SDL_VideoDisplay *display;
   781 
   782     CHECK_DISPLAY_INDEX(displayIndex, -1);
   783 
   784     display = &_this->displays[displayIndex];
   785     if (mode) {
   786         *mode = display->current_mode;
   787     }
   788     return 0;
   789 }
   790 
   791 static SDL_DisplayMode *
   792 SDL_GetClosestDisplayModeForDisplay(SDL_VideoDisplay * display,
   793                                     const SDL_DisplayMode * mode,
   794                                     SDL_DisplayMode * closest)
   795 {
   796     Uint32 target_format;
   797     int target_refresh_rate;
   798     int i;
   799     SDL_DisplayMode *current, *match;
   800 
   801     if (!mode || !closest) {
   802         SDL_SetError("Missing desired mode or closest mode parameter");
   803         return NULL;
   804     }
   805 
   806     /* Default to the desktop format */
   807     if (mode->format) {
   808         target_format = mode->format;
   809     } else {
   810         target_format = display->desktop_mode.format;
   811     }
   812 
   813     /* Default to the desktop refresh rate */
   814     if (mode->refresh_rate) {
   815         target_refresh_rate = mode->refresh_rate;
   816     } else {
   817         target_refresh_rate = display->desktop_mode.refresh_rate;
   818     }
   819 
   820     match = NULL;
   821     for (i = 0; i < SDL_GetNumDisplayModesForDisplay(display); ++i) {
   822         current = &display->display_modes[i];
   823 
   824         if (current->w && (current->w < mode->w)) {
   825             /* Out of sorted modes large enough here */
   826             break;
   827         }
   828         if (current->h && (current->h < mode->h)) {
   829             if (current->w && (current->w == mode->w)) {
   830                 /* Out of sorted modes large enough here */
   831                 break;
   832             }
   833             /* Wider, but not tall enough, due to a different
   834                aspect ratio. This mode must be skipped, but closer
   835                modes may still follow. */
   836             continue;
   837         }
   838         if (!match || current->w < match->w || current->h < match->h) {
   839             match = current;
   840             continue;
   841         }
   842         if (current->format != match->format) {
   843             /* Sorted highest depth to lowest */
   844             if (current->format == target_format ||
   845                 (SDL_BITSPERPIXEL(current->format) >=
   846                  SDL_BITSPERPIXEL(target_format)
   847                  && SDL_PIXELTYPE(current->format) ==
   848                  SDL_PIXELTYPE(target_format))) {
   849                 match = current;
   850             }
   851             continue;
   852         }
   853         if (current->refresh_rate != match->refresh_rate) {
   854             /* Sorted highest refresh to lowest */
   855             if (current->refresh_rate >= target_refresh_rate) {
   856                 match = current;
   857             }
   858         }
   859     }
   860     if (match) {
   861         if (match->format) {
   862             closest->format = match->format;
   863         } else {
   864             closest->format = mode->format;
   865         }
   866         if (match->w && match->h) {
   867             closest->w = match->w;
   868             closest->h = match->h;
   869         } else {
   870             closest->w = mode->w;
   871             closest->h = mode->h;
   872         }
   873         if (match->refresh_rate) {
   874             closest->refresh_rate = match->refresh_rate;
   875         } else {
   876             closest->refresh_rate = mode->refresh_rate;
   877         }
   878         closest->driverdata = match->driverdata;
   879 
   880         /*
   881          * Pick some reasonable defaults if the app and driver don't
   882          * care
   883          */
   884         if (!closest->format) {
   885             closest->format = SDL_PIXELFORMAT_RGB888;
   886         }
   887         if (!closest->w) {
   888             closest->w = 640;
   889         }
   890         if (!closest->h) {
   891             closest->h = 480;
   892         }
   893         return closest;
   894     }
   895     return NULL;
   896 }
   897 
   898 SDL_DisplayMode *
   899 SDL_GetClosestDisplayMode(int displayIndex,
   900                           const SDL_DisplayMode * mode,
   901                           SDL_DisplayMode * closest)
   902 {
   903     SDL_VideoDisplay *display;
   904 
   905     CHECK_DISPLAY_INDEX(displayIndex, NULL);
   906 
   907     display = &_this->displays[displayIndex];
   908     return SDL_GetClosestDisplayModeForDisplay(display, mode, closest);
   909 }
   910 
   911 static int
   912 SDL_SetDisplayModeForDisplay(SDL_VideoDisplay * display, const SDL_DisplayMode * mode)
   913 {
   914     SDL_DisplayMode display_mode;
   915     SDL_DisplayMode current_mode;
   916 
   917     if (mode) {
   918         display_mode = *mode;
   919 
   920         /* Default to the current mode */
   921         if (!display_mode.format) {
   922             display_mode.format = display->current_mode.format;
   923         }
   924         if (!display_mode.w) {
   925             display_mode.w = display->current_mode.w;
   926         }
   927         if (!display_mode.h) {
   928             display_mode.h = display->current_mode.h;
   929         }
   930         if (!display_mode.refresh_rate) {
   931             display_mode.refresh_rate = display->current_mode.refresh_rate;
   932         }
   933 
   934         /* Get a good video mode, the closest one possible */
   935         if (!SDL_GetClosestDisplayModeForDisplay(display, &display_mode, &display_mode)) {
   936             return SDL_SetError("No video mode large enough for %dx%d",
   937                                 display_mode.w, display_mode.h);
   938         }
   939     } else {
   940         display_mode = display->desktop_mode;
   941     }
   942 
   943     /* See if there's anything left to do */
   944     current_mode = display->current_mode;
   945     if (SDL_memcmp(&display_mode, &current_mode, sizeof(display_mode)) == 0) {
   946         return 0;
   947     }
   948 
   949     /* Actually change the display mode */
   950     if (!_this->SetDisplayMode) {
   951         return SDL_SetError("Video driver doesn't support changing display mode");
   952     }
   953     if (_this->SetDisplayMode(_this, display, &display_mode) < 0) {
   954         return -1;
   955     }
   956     display->current_mode = display_mode;
   957     return 0;
   958 }
   959 
   960 int
   961 SDL_GetWindowDisplayIndex(SDL_Window * window)
   962 {
   963     int displayIndex;
   964     int i, dist;
   965     int closest = -1;
   966     int closest_dist = 0x7FFFFFFF;
   967     SDL_Point center;
   968     SDL_Point delta;
   969     SDL_Rect rect;
   970 
   971     CHECK_WINDOW_MAGIC(window, -1);
   972 
   973     if (SDL_WINDOWPOS_ISUNDEFINED(window->x) ||
   974         SDL_WINDOWPOS_ISCENTERED(window->x)) {
   975         displayIndex = (window->x & 0xFFFF);
   976         if (displayIndex >= _this->num_displays) {
   977             displayIndex = 0;
   978         }
   979         return displayIndex;
   980     }
   981     if (SDL_WINDOWPOS_ISUNDEFINED(window->y) ||
   982         SDL_WINDOWPOS_ISCENTERED(window->y)) {
   983         displayIndex = (window->y & 0xFFFF);
   984         if (displayIndex >= _this->num_displays) {
   985             displayIndex = 0;
   986         }
   987         return displayIndex;
   988     }
   989 
   990     /* Find the display containing the window */
   991     for (i = 0; i < _this->num_displays; ++i) {
   992         SDL_VideoDisplay *display = &_this->displays[i];
   993 
   994         if (display->fullscreen_window == window) {
   995             return i;
   996         }
   997     }
   998     center.x = window->x + window->w / 2;
   999     center.y = window->y + window->h / 2;
  1000     for (i = 0; i < _this->num_displays; ++i) {
  1001         SDL_GetDisplayBounds(i, &rect);
  1002         if (SDL_EnclosePoints(&center, 1, &rect, NULL)) {
  1003             return i;
  1004         }
  1005 
  1006         delta.x = center.x - (rect.x + rect.w / 2);
  1007         delta.y = center.y - (rect.y + rect.h / 2);
  1008         dist = (delta.x*delta.x + delta.y*delta.y);
  1009         if (dist < closest_dist) {
  1010             closest = i;
  1011             closest_dist = dist;
  1012         }
  1013     }
  1014     if (closest < 0) {
  1015         SDL_SetError("Couldn't find any displays");
  1016     }
  1017     return closest;
  1018 }
  1019 
  1020 SDL_VideoDisplay *
  1021 SDL_GetDisplayForWindow(SDL_Window *window)
  1022 {
  1023     int displayIndex = SDL_GetWindowDisplayIndex(window);
  1024     if (displayIndex >= 0) {
  1025         return &_this->displays[displayIndex];
  1026     } else {
  1027         return NULL;
  1028     }
  1029 }
  1030 
  1031 int
  1032 SDL_SetWindowDisplayMode(SDL_Window * window, const SDL_DisplayMode * mode)
  1033 {
  1034     CHECK_WINDOW_MAGIC(window, -1);
  1035 
  1036     if (mode) {
  1037         window->fullscreen_mode = *mode;
  1038     } else {
  1039         SDL_zero(window->fullscreen_mode);
  1040     }
  1041 
  1042     if (FULLSCREEN_VISIBLE(window) && (window->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) != SDL_WINDOW_FULLSCREEN_DESKTOP) {
  1043         SDL_DisplayMode fullscreen_mode;
  1044         if (SDL_GetWindowDisplayMode(window, &fullscreen_mode) == 0) {
  1045             SDL_SetDisplayModeForDisplay(SDL_GetDisplayForWindow(window), &fullscreen_mode);
  1046         }
  1047     }
  1048     return 0;
  1049 }
  1050 
  1051 int
  1052 SDL_GetWindowDisplayMode(SDL_Window * window, SDL_DisplayMode * mode)
  1053 {
  1054     SDL_DisplayMode fullscreen_mode;
  1055     SDL_VideoDisplay *display;
  1056 
  1057     CHECK_WINDOW_MAGIC(window, -1);
  1058 
  1059     if (!mode) {
  1060         return SDL_InvalidParamError("mode");
  1061     }
  1062 
  1063     fullscreen_mode = window->fullscreen_mode;
  1064     if (!fullscreen_mode.w) {
  1065         fullscreen_mode.w = window->windowed.w;
  1066     }
  1067     if (!fullscreen_mode.h) {
  1068         fullscreen_mode.h = window->windowed.h;
  1069     }
  1070 
  1071     display = SDL_GetDisplayForWindow(window);
  1072 
  1073     /* if in desktop size mode, just return the size of the desktop */
  1074     if ((window->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP) {
  1075         fullscreen_mode = display->desktop_mode;
  1076     } else if (!SDL_GetClosestDisplayModeForDisplay(SDL_GetDisplayForWindow(window),
  1077                                              &fullscreen_mode,
  1078                                              &fullscreen_mode)) {
  1079         return SDL_SetError("Couldn't find display mode match");
  1080     }
  1081 
  1082     if (mode) {
  1083         *mode = fullscreen_mode;
  1084     }
  1085     return 0;
  1086 }
  1087 
  1088 Uint32
  1089 SDL_GetWindowPixelFormat(SDL_Window * window)
  1090 {
  1091     SDL_VideoDisplay *display;
  1092 
  1093     CHECK_WINDOW_MAGIC(window, SDL_PIXELFORMAT_UNKNOWN);
  1094 
  1095     display = SDL_GetDisplayForWindow(window);
  1096     return display->current_mode.format;
  1097 }
  1098 
  1099 static void
  1100 SDL_RestoreMousePosition(SDL_Window *window)
  1101 {
  1102     int x, y;
  1103 
  1104     if (window == SDL_GetMouseFocus()) {
  1105         SDL_GetMouseState(&x, &y);
  1106         SDL_WarpMouseInWindow(window, x, y);
  1107     }
  1108 }
  1109 
  1110 static int
  1111 SDL_UpdateFullscreenMode(SDL_Window * window, SDL_bool fullscreen)
  1112 {
  1113     SDL_VideoDisplay *display;
  1114     SDL_Window *other;
  1115 
  1116     CHECK_WINDOW_MAGIC(window,-1);
  1117 
  1118     /* if we are in the process of hiding don't go back to fullscreen */
  1119     if ( window->is_hiding && fullscreen )
  1120         return 0;
  1121     
  1122 #ifdef __MACOSX__
  1123     if (Cocoa_SetWindowFullscreenSpace(window, fullscreen)) {
  1124         window->last_fullscreen_flags = window->flags;
  1125         return 0;
  1126     }
  1127 #endif
  1128 
  1129     display = SDL_GetDisplayForWindow(window);
  1130 
  1131     if (fullscreen) {
  1132         /* Hide any other fullscreen windows */
  1133         if (display->fullscreen_window &&
  1134             display->fullscreen_window != window) {
  1135             SDL_MinimizeWindow(display->fullscreen_window);
  1136         }
  1137     }
  1138 
  1139     /* See if anything needs to be done now */
  1140     if ((display->fullscreen_window == window) == fullscreen) {
  1141         if ((window->last_fullscreen_flags & FULLSCREEN_MASK) == (window->flags & FULLSCREEN_MASK)) {
  1142             return 0;
  1143         }
  1144     }
  1145 
  1146     /* See if there are any fullscreen windows */
  1147     for (other = _this->windows; other; other = other->next) {
  1148         SDL_bool setDisplayMode = SDL_FALSE;
  1149 
  1150         if (other == window) {
  1151             setDisplayMode = fullscreen;
  1152         } else if (FULLSCREEN_VISIBLE(other) &&
  1153                    SDL_GetDisplayForWindow(other) == display) {
  1154             setDisplayMode = SDL_TRUE;
  1155         }
  1156 
  1157         if (setDisplayMode) {
  1158             SDL_DisplayMode fullscreen_mode;
  1159 
  1160             SDL_zero(fullscreen_mode);
  1161 
  1162             if (SDL_GetWindowDisplayMode(other, &fullscreen_mode) == 0) {
  1163                 SDL_bool resized = SDL_TRUE;
  1164 
  1165                 if (other->w == fullscreen_mode.w && other->h == fullscreen_mode.h) {
  1166                     resized = SDL_FALSE;
  1167                 }
  1168 
  1169                 /* only do the mode change if we want exclusive fullscreen */
  1170                 if ((window->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) != SDL_WINDOW_FULLSCREEN_DESKTOP) {
  1171                     if (SDL_SetDisplayModeForDisplay(display, &fullscreen_mode) < 0) {
  1172                         return -1;
  1173                     }
  1174                 } else {
  1175                     if (SDL_SetDisplayModeForDisplay(display, NULL) < 0) {
  1176                         return -1;
  1177                     }
  1178                 }
  1179 
  1180                 if (_this->SetWindowFullscreen) {
  1181                     _this->SetWindowFullscreen(_this, other, display, SDL_TRUE);
  1182                 }
  1183                 display->fullscreen_window = other;
  1184 
  1185                 /* Generate a mode change event here */
  1186                 if (resized) {
  1187                     SDL_SendWindowEvent(other, SDL_WINDOWEVENT_RESIZED,
  1188                                         fullscreen_mode.w, fullscreen_mode.h);
  1189                 } else {
  1190                     SDL_OnWindowResized(other);
  1191                 }
  1192 
  1193                 SDL_RestoreMousePosition(other);
  1194 
  1195                 window->last_fullscreen_flags = window->flags;
  1196                 return 0;
  1197             }
  1198         }
  1199     }
  1200 
  1201     /* Nope, restore the desktop mode */
  1202     SDL_SetDisplayModeForDisplay(display, NULL);
  1203 
  1204     if (_this->SetWindowFullscreen) {
  1205         _this->SetWindowFullscreen(_this, window, display, SDL_FALSE);
  1206     }
  1207     display->fullscreen_window = NULL;
  1208 
  1209     /* Generate a mode change event here */
  1210     SDL_OnWindowResized(window);
  1211 
  1212     /* Restore the cursor position */
  1213     SDL_RestoreMousePosition(window);
  1214 
  1215     window->last_fullscreen_flags = window->flags;
  1216     return 0;
  1217 }
  1218 
  1219 #define CREATE_FLAGS \
  1220     (SDL_WINDOW_OPENGL | SDL_WINDOW_BORDERLESS | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI)
  1221 
  1222 static void
  1223 SDL_FinishWindowCreation(SDL_Window *window, Uint32 flags)
  1224 {
  1225     window->windowed.x = window->x;
  1226     window->windowed.y = window->y;
  1227     window->windowed.w = window->w;
  1228     window->windowed.h = window->h;
  1229 
  1230     if (flags & SDL_WINDOW_MAXIMIZED) {
  1231         SDL_MaximizeWindow(window);
  1232     }
  1233     if (flags & SDL_WINDOW_MINIMIZED) {
  1234         SDL_MinimizeWindow(window);
  1235     }
  1236     if (flags & SDL_WINDOW_FULLSCREEN) {
  1237         SDL_SetWindowFullscreen(window, flags);
  1238     }
  1239     if (flags & SDL_WINDOW_INPUT_GRABBED) {
  1240         SDL_SetWindowGrab(window, SDL_TRUE);
  1241     }
  1242     if (!(flags & SDL_WINDOW_HIDDEN)) {
  1243         SDL_ShowWindow(window);
  1244     }
  1245 }
  1246 
  1247 SDL_Window *
  1248 SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
  1249 {
  1250     SDL_Window *window;
  1251     const char *hint;
  1252 
  1253     if (!_this) {
  1254         /* Initialize the video system if needed */
  1255         if (SDL_VideoInit(NULL) < 0) {
  1256             return NULL;
  1257         }
  1258     }
  1259 
  1260     /* Some platforms can't create zero-sized windows */
  1261     if (w < 1) {
  1262         w = 1;
  1263     }
  1264     if (h < 1) {
  1265         h = 1;
  1266     }
  1267 
  1268     /* Some platforms blow up if the windows are too large. Raise it later? */
  1269     if ((w > 16384) || (h > 16384)) {
  1270         SDL_SetError("Window is too large.");
  1271         return NULL;
  1272     }
  1273 
  1274     /* Some platforms have OpenGL enabled by default */
  1275 #if (SDL_VIDEO_OPENGL && __MACOSX__) || __IPHONEOS__ || __ANDROID__ || __NACL__
  1276     flags |= SDL_WINDOW_OPENGL;
  1277 #endif
  1278     if (flags & SDL_WINDOW_OPENGL) {
  1279         if (!_this->GL_CreateContext) {
  1280             SDL_SetError("No OpenGL support in video driver");
  1281             return NULL;
  1282         }
  1283         if (SDL_GL_LoadLibrary(NULL) < 0) {
  1284             return NULL;
  1285         }
  1286     }
  1287 
  1288     /* Unless the user has specified the high-DPI disabling hint, respect the
  1289      * SDL_WINDOW_ALLOW_HIGHDPI flag.
  1290      */
  1291     if (flags & SDL_WINDOW_ALLOW_HIGHDPI) {
  1292         hint = SDL_GetHint(SDL_HINT_VIDEO_HIGHDPI_DISABLED);
  1293         if (hint && SDL_atoi(hint) > 0) {
  1294             flags &= ~SDL_WINDOW_ALLOW_HIGHDPI;
  1295         }
  1296     }
  1297 
  1298     window = (SDL_Window *)SDL_calloc(1, sizeof(*window));
  1299     if (!window) {
  1300         SDL_OutOfMemory();
  1301         return NULL;
  1302     }
  1303     window->magic = &_this->window_magic;
  1304     window->id = _this->next_object_id++;
  1305     window->x = x;
  1306     window->y = y;
  1307     window->w = w;
  1308     window->h = h;
  1309     if (SDL_WINDOWPOS_ISUNDEFINED(x) || SDL_WINDOWPOS_ISUNDEFINED(y) ||
  1310         SDL_WINDOWPOS_ISCENTERED(x) || SDL_WINDOWPOS_ISCENTERED(y)) {
  1311         SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
  1312         int displayIndex;
  1313         SDL_Rect bounds;
  1314 
  1315         displayIndex = SDL_GetIndexOfDisplay(display);
  1316         SDL_GetDisplayBounds(displayIndex, &bounds);
  1317         if (SDL_WINDOWPOS_ISUNDEFINED(x) || SDL_WINDOWPOS_ISCENTERED(x)) {
  1318             window->x = bounds.x + (bounds.w - w) / 2;
  1319         }
  1320         if (SDL_WINDOWPOS_ISUNDEFINED(y) || SDL_WINDOWPOS_ISCENTERED(y)) {
  1321             window->y = bounds.y + (bounds.h - h) / 2;
  1322         }
  1323     }
  1324     window->flags = ((flags & CREATE_FLAGS) | SDL_WINDOW_HIDDEN);
  1325     window->last_fullscreen_flags = window->flags;
  1326     window->brightness = 1.0f;
  1327     window->next = _this->windows;
  1328     window->is_destroying = SDL_FALSE;
  1329 
  1330     if (_this->windows) {
  1331         _this->windows->prev = window;
  1332     }
  1333     _this->windows = window;
  1334 
  1335     if (_this->CreateWindow && _this->CreateWindow(_this, window) < 0) {
  1336         SDL_DestroyWindow(window);
  1337         return NULL;
  1338     }
  1339 
  1340     if (title) {
  1341         SDL_SetWindowTitle(window, title);
  1342     }
  1343     SDL_FinishWindowCreation(window, flags);
  1344 
  1345     /* If the window was created fullscreen, make sure the mode code matches */
  1346     SDL_UpdateFullscreenMode(window, FULLSCREEN_VISIBLE(window));
  1347 
  1348     return window;
  1349 }
  1350 
  1351 SDL_Window *
  1352 SDL_CreateWindowFrom(const void *data)
  1353 {
  1354     SDL_Window *window;
  1355 
  1356     if (!_this) {
  1357         SDL_UninitializedVideo();
  1358         return NULL;
  1359     }
  1360     if (!_this->CreateWindowFrom) {
  1361         SDL_Unsupported();
  1362         return NULL;
  1363     }
  1364     window = (SDL_Window *)SDL_calloc(1, sizeof(*window));
  1365     if (!window) {
  1366         SDL_OutOfMemory();
  1367         return NULL;
  1368     }
  1369     window->magic = &_this->window_magic;
  1370     window->id = _this->next_object_id++;
  1371     window->flags = SDL_WINDOW_FOREIGN;
  1372     window->last_fullscreen_flags = window->flags;
  1373     window->is_destroying = SDL_FALSE;
  1374     window->brightness = 1.0f;
  1375     window->next = _this->windows;
  1376     if (_this->windows) {
  1377         _this->windows->prev = window;
  1378     }
  1379     _this->windows = window;
  1380 
  1381     if (_this->CreateWindowFrom(_this, window, data) < 0) {
  1382         SDL_DestroyWindow(window);
  1383         return NULL;
  1384     }
  1385     return window;
  1386 }
  1387 
  1388 int
  1389 SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
  1390 {
  1391     char *title = window->title;
  1392     SDL_Surface *icon = window->icon;
  1393     SDL_bool loaded_opengl = SDL_FALSE;
  1394 
  1395     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
  1396         return SDL_SetError("No OpenGL support in video driver");
  1397     }
  1398 
  1399     if (window->flags & SDL_WINDOW_FOREIGN) {
  1400         /* Can't destroy and re-create foreign windows, hrm */
  1401         flags |= SDL_WINDOW_FOREIGN;
  1402     } else {
  1403         flags &= ~SDL_WINDOW_FOREIGN;
  1404     }
  1405 
  1406     /* Restore video mode, etc. */
  1407     SDL_HideWindow(window);
  1408 
  1409     /* Tear down the old native window */
  1410     if (window->surface) {
  1411         window->surface->flags &= ~SDL_DONTFREE;
  1412         SDL_FreeSurface(window->surface);
  1413     }
  1414     if (_this->DestroyWindowFramebuffer) {
  1415         _this->DestroyWindowFramebuffer(_this, window);
  1416     }
  1417     if (_this->DestroyWindow && !(flags & SDL_WINDOW_FOREIGN)) {
  1418         _this->DestroyWindow(_this, window);
  1419     }
  1420 
  1421     if ((window->flags & SDL_WINDOW_OPENGL) != (flags & SDL_WINDOW_OPENGL)) {
  1422         if (flags & SDL_WINDOW_OPENGL) {
  1423             if (SDL_GL_LoadLibrary(NULL) < 0) {
  1424                 return -1;
  1425             }
  1426             loaded_opengl = SDL_TRUE;
  1427         } else {
  1428             SDL_GL_UnloadLibrary();
  1429         }
  1430     }
  1431 
  1432     window->title = NULL;
  1433     window->icon = NULL;
  1434     window->flags = ((flags & CREATE_FLAGS) | SDL_WINDOW_HIDDEN);
  1435     window->last_fullscreen_flags = window->flags;
  1436     window->is_destroying = SDL_FALSE;
  1437 
  1438     if (_this->CreateWindow && !(flags & SDL_WINDOW_FOREIGN)) {
  1439         if (_this->CreateWindow(_this, window) < 0) {
  1440             if (loaded_opengl) {
  1441                 SDL_GL_UnloadLibrary();
  1442                 window->flags &= ~SDL_WINDOW_OPENGL;
  1443             }
  1444             return -1;
  1445         }
  1446     }
  1447     if (flags & SDL_WINDOW_FOREIGN) {
  1448         window->flags |= SDL_WINDOW_FOREIGN;
  1449     }
  1450 
  1451     if (title) {
  1452         SDL_SetWindowTitle(window, title);
  1453         SDL_free(title);
  1454     }
  1455     if (icon) {
  1456         SDL_SetWindowIcon(window, icon);
  1457         SDL_FreeSurface(icon);
  1458     }
  1459 
  1460     if (window->hit_test) {
  1461         _this->SetWindowHitTest(window, SDL_TRUE);
  1462     }
  1463 
  1464     SDL_FinishWindowCreation(window, flags);
  1465 
  1466     return 0;
  1467 }
  1468 
  1469 Uint32
  1470 SDL_GetWindowID(SDL_Window * window)
  1471 {
  1472     CHECK_WINDOW_MAGIC(window, 0);
  1473 
  1474     return window->id;
  1475 }
  1476 
  1477 SDL_Window *
  1478 SDL_GetWindowFromID(Uint32 id)
  1479 {
  1480     SDL_Window *window;
  1481 
  1482     if (!_this) {
  1483         return NULL;
  1484     }
  1485     for (window = _this->windows; window; window = window->next) {
  1486         if (window->id == id) {
  1487             return window;
  1488         }
  1489     }
  1490     return NULL;
  1491 }
  1492 
  1493 Uint32
  1494 SDL_GetWindowFlags(SDL_Window * window)
  1495 {
  1496     CHECK_WINDOW_MAGIC(window, 0);
  1497 
  1498     return window->flags;
  1499 }
  1500 
  1501 void
  1502 SDL_SetWindowTitle(SDL_Window * window, const char *title)
  1503 {
  1504     CHECK_WINDOW_MAGIC(window,);
  1505 
  1506     if (title == window->title) {
  1507         return;
  1508     }
  1509     SDL_free(window->title);
  1510 
  1511     window->title = SDL_strdup(title ? title : "");
  1512 
  1513     if (_this->SetWindowTitle) {
  1514         _this->SetWindowTitle(_this, window);
  1515     }
  1516 }
  1517 
  1518 const char *
  1519 SDL_GetWindowTitle(SDL_Window * window)
  1520 {
  1521     CHECK_WINDOW_MAGIC(window, "");
  1522 
  1523     return window->title ? window->title : "";
  1524 }
  1525 
  1526 void
  1527 SDL_SetWindowIcon(SDL_Window * window, SDL_Surface * icon)
  1528 {
  1529     CHECK_WINDOW_MAGIC(window,);
  1530 
  1531     if (!icon) {
  1532         return;
  1533     }
  1534 
  1535     SDL_FreeSurface(window->icon);
  1536 
  1537     /* Convert the icon into ARGB8888 */
  1538     window->icon = SDL_ConvertSurfaceFormat(icon, SDL_PIXELFORMAT_ARGB8888, 0);
  1539     if (!window->icon) {
  1540         return;
  1541     }
  1542 
  1543     if (_this->SetWindowIcon) {
  1544         _this->SetWindowIcon(_this, window, window->icon);
  1545     }
  1546 }
  1547 
  1548 void*
  1549 SDL_SetWindowData(SDL_Window * window, const char *name, void *userdata)
  1550 {
  1551     SDL_WindowUserData *prev, *data;
  1552 
  1553     CHECK_WINDOW_MAGIC(window, NULL);
  1554 
  1555     /* Input validation */
  1556     if (name == NULL || name[0] == '\0') {
  1557       SDL_InvalidParamError("name");
  1558       return NULL;
  1559     }
  1560 
  1561     /* See if the named data already exists */
  1562     prev = NULL;
  1563     for (data = window->data; data; prev = data, data = data->next) {
  1564         if (data->name && SDL_strcmp(data->name, name) == 0) {
  1565             void *last_value = data->data;
  1566 
  1567             if (userdata) {
  1568                 /* Set the new value */
  1569                 data->data = userdata;
  1570             } else {
  1571                 /* Delete this value */
  1572                 if (prev) {
  1573                     prev->next = data->next;
  1574                 } else {
  1575                     window->data = data->next;
  1576                 }
  1577                 SDL_free(data->name);
  1578                 SDL_free(data);
  1579             }
  1580             return last_value;
  1581         }
  1582     }
  1583 
  1584     /* Add new data to the window */
  1585     if (userdata) {
  1586         data = (SDL_WindowUserData *)SDL_malloc(sizeof(*data));
  1587         data->name = SDL_strdup(name);
  1588         data->data = userdata;
  1589         data->next = window->data;
  1590         window->data = data;
  1591     }
  1592     return NULL;
  1593 }
  1594 
  1595 void *
  1596 SDL_GetWindowData(SDL_Window * window, const char *name)
  1597 {
  1598     SDL_WindowUserData *data;
  1599 
  1600     CHECK_WINDOW_MAGIC(window, NULL);
  1601 
  1602     /* Input validation */
  1603     if (name == NULL || name[0] == '\0') {
  1604       SDL_InvalidParamError("name");
  1605       return NULL;
  1606     }
  1607 
  1608     for (data = window->data; data; data = data->next) {
  1609         if (data->name && SDL_strcmp(data->name, name) == 0) {
  1610             return data->data;
  1611         }
  1612     }
  1613     return NULL;
  1614 }
  1615 
  1616 void
  1617 SDL_SetWindowPosition(SDL_Window * window, int x, int y)
  1618 {
  1619     CHECK_WINDOW_MAGIC(window,);
  1620 
  1621     if (SDL_WINDOWPOS_ISCENTERED(x) || SDL_WINDOWPOS_ISCENTERED(y)) {
  1622         int displayIndex = (x & 0xFFFF);
  1623         SDL_Rect bounds;
  1624         if (displayIndex > _this->num_displays) {
  1625             displayIndex = 0;
  1626         }
  1627 
  1628         SDL_zero(bounds);
  1629 
  1630         SDL_GetDisplayBounds(displayIndex, &bounds);
  1631         if (SDL_WINDOWPOS_ISCENTERED(x)) {
  1632             x = bounds.x + (bounds.w - window->w) / 2;
  1633         }
  1634         if (SDL_WINDOWPOS_ISCENTERED(y)) {
  1635             y = bounds.y + (bounds.h - window->h) / 2;
  1636         }
  1637     }
  1638 
  1639     if ((window->flags & SDL_WINDOW_FULLSCREEN)) {
  1640         if (!SDL_WINDOWPOS_ISUNDEFINED(x)) {
  1641             window->windowed.x = x;
  1642         }
  1643         if (!SDL_WINDOWPOS_ISUNDEFINED(y)) {
  1644             window->windowed.y = y;
  1645         }
  1646     } else {
  1647         if (!SDL_WINDOWPOS_ISUNDEFINED(x)) {
  1648             window->x = x;
  1649         }
  1650         if (!SDL_WINDOWPOS_ISUNDEFINED(y)) {
  1651             window->y = y;
  1652         }
  1653 
  1654         if (_this->SetWindowPosition) {
  1655             _this->SetWindowPosition(_this, window);
  1656         }
  1657         SDL_SendWindowEvent(window, SDL_WINDOWEVENT_MOVED, x, y);
  1658     }
  1659 }
  1660 
  1661 void
  1662 SDL_GetWindowPosition(SDL_Window * window, int *x, int *y)
  1663 {
  1664     CHECK_WINDOW_MAGIC(window,);
  1665 
  1666     /* Fullscreen windows are always at their display's origin */
  1667     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1668         if (x) {
  1669             *x = 0;
  1670         }
  1671         if (y) {
  1672             *y = 0;
  1673         }
  1674     } else {
  1675         if (x) {
  1676             *x = window->x;
  1677         }
  1678         if (y) {
  1679             *y = window->y;
  1680         }
  1681     }
  1682 }
  1683 
  1684 void
  1685 SDL_SetWindowBordered(SDL_Window * window, SDL_bool bordered)
  1686 {
  1687     CHECK_WINDOW_MAGIC(window,);
  1688     if (!(window->flags & SDL_WINDOW_FULLSCREEN)) {
  1689         const int want = (bordered != SDL_FALSE);  /* normalize the flag. */
  1690         const int have = ((window->flags & SDL_WINDOW_BORDERLESS) == 0);
  1691         if ((want != have) && (_this->SetWindowBordered)) {
  1692             if (want) {
  1693                 window->flags &= ~SDL_WINDOW_BORDERLESS;
  1694             } else {
  1695                 window->flags |= SDL_WINDOW_BORDERLESS;
  1696             }
  1697             _this->SetWindowBordered(_this, window, (SDL_bool) want);
  1698         }
  1699     }
  1700 }
  1701 
  1702 void
  1703 SDL_SetWindowSize(SDL_Window * window, int w, int h)
  1704 {
  1705     CHECK_WINDOW_MAGIC(window,);
  1706     if (w <= 0) {
  1707         SDL_InvalidParamError("w");
  1708         return;
  1709     }
  1710     if (h <= 0) {
  1711         SDL_InvalidParamError("h");
  1712         return;
  1713     }
  1714 
  1715     /* Make sure we don't exceed any window size limits */
  1716     if (window->min_w && w < window->min_w)
  1717     {
  1718         w = window->min_w;
  1719     }
  1720     if (window->max_w && w > window->max_w)
  1721     {
  1722         w = window->max_w;
  1723     }
  1724     if (window->min_h && h < window->min_h)
  1725     {
  1726         h = window->min_h;
  1727     }
  1728     if (window->max_h && h > window->max_h)
  1729     {
  1730         h = window->max_h;
  1731     }
  1732 
  1733     window->windowed.w = w;
  1734     window->windowed.h = h;
  1735 
  1736     if (window->flags & SDL_WINDOW_FULLSCREEN) {
  1737         if (FULLSCREEN_VISIBLE(window) && (window->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) != SDL_WINDOW_FULLSCREEN_DESKTOP) {
  1738             window->last_fullscreen_flags = 0;
  1739             SDL_UpdateFullscreenMode(window, SDL_TRUE);
  1740         }
  1741     } else {
  1742         window->w = w;
  1743         window->h = h;
  1744         if (_this->SetWindowSize) {
  1745             _this->SetWindowSize(_this, window);
  1746         }
  1747         if (window->w == w && window->h == h) {
  1748             /* We didn't get a SDL_WINDOWEVENT_RESIZED event (by design) */
  1749             SDL_OnWindowResized(window);
  1750         }
  1751     }
  1752 }
  1753 
  1754 void
  1755 SDL_GetWindowSize(SDL_Window * window, int *w, int *h)
  1756 {
  1757     CHECK_WINDOW_MAGIC(window,);
  1758     if (w) {
  1759         *w = window->w;
  1760     }
  1761     if (h) {
  1762         *h = window->h;
  1763     }
  1764 }
  1765 
  1766 void
  1767 SDL_SetWindowMinimumSize(SDL_Window * window, int min_w, int min_h)
  1768 {
  1769     CHECK_WINDOW_MAGIC(window,);
  1770     if (min_w <= 0) {
  1771         SDL_InvalidParamError("min_w");
  1772         return;
  1773     }
  1774     if (min_h <= 0) {
  1775         SDL_InvalidParamError("min_h");
  1776         return;
  1777     }
  1778 
  1779     if (!(window->flags & SDL_WINDOW_FULLSCREEN)) {
  1780         window->min_w = min_w;
  1781         window->min_h = min_h;
  1782         if (_this->SetWindowMinimumSize) {
  1783             _this->SetWindowMinimumSize(_this, window);
  1784         }
  1785         /* Ensure that window is not smaller than minimal size */
  1786         SDL_SetWindowSize(window, SDL_max(window->w, window->min_w), SDL_max(window->h, window->min_h));
  1787     }
  1788 }
  1789 
  1790 void
  1791 SDL_GetWindowMinimumSize(SDL_Window * window, int *min_w, int *min_h)
  1792 {
  1793     CHECK_WINDOW_MAGIC(window,);
  1794     if (min_w) {
  1795         *min_w = window->min_w;
  1796     }
  1797     if (min_h) {
  1798         *min_h = window->min_h;
  1799     }
  1800 }
  1801 
  1802 void
  1803 SDL_SetWindowMaximumSize(SDL_Window * window, int max_w, int max_h)
  1804 {
  1805     CHECK_WINDOW_MAGIC(window,);
  1806     if (max_w <= 0) {
  1807         SDL_InvalidParamError("max_w");
  1808         return;
  1809     }
  1810     if (max_h <= 0) {
  1811         SDL_InvalidParamError("max_h");
  1812         return;
  1813     }
  1814 
  1815     if (!(window->flags & SDL_WINDOW_FULLSCREEN)) {
  1816         window->max_w = max_w;
  1817         window->max_h = max_h;
  1818         if (_this->SetWindowMaximumSize) {
  1819             _this->SetWindowMaximumSize(_this, window);
  1820         }
  1821         /* Ensure that window is not larger than maximal size */
  1822         SDL_SetWindowSize(window, SDL_min(window->w, window->max_w), SDL_min(window->h, window->max_h));
  1823     }
  1824 }
  1825 
  1826 void
  1827 SDL_GetWindowMaximumSize(SDL_Window * window, int *max_w, int *max_h)
  1828 {
  1829     CHECK_WINDOW_MAGIC(window,);
  1830     if (max_w) {
  1831         *max_w = window->max_w;
  1832     }
  1833     if (max_h) {
  1834         *max_h = window->max_h;
  1835     }
  1836 }
  1837 
  1838 void
  1839 SDL_ShowWindow(SDL_Window * window)
  1840 {
  1841     CHECK_WINDOW_MAGIC(window,);
  1842 
  1843     if (window->flags & SDL_WINDOW_SHOWN) {
  1844         return;
  1845     }
  1846 
  1847     if (_this->ShowWindow) {
  1848         _this->ShowWindow(_this, window);
  1849     }
  1850     SDL_SendWindowEvent(window, SDL_WINDOWEVENT_SHOWN, 0, 0);
  1851 }
  1852 
  1853 void
  1854 SDL_HideWindow(SDL_Window * window)
  1855 {
  1856     CHECK_WINDOW_MAGIC(window,);
  1857 
  1858     if (!(window->flags & SDL_WINDOW_SHOWN)) {
  1859         return;
  1860     }
  1861 
  1862 	window->is_hiding = SDL_TRUE;
  1863     SDL_UpdateFullscreenMode(window, SDL_FALSE);
  1864 
  1865     if (_this->HideWindow) {
  1866         _this->HideWindow(_this, window);
  1867     }
  1868 	window->is_hiding = SDL_FALSE;
  1869     SDL_SendWindowEvent(window, SDL_WINDOWEVENT_HIDDEN, 0, 0);
  1870 }
  1871 
  1872 void
  1873 SDL_RaiseWindow(SDL_Window * window)
  1874 {
  1875     CHECK_WINDOW_MAGIC(window,);
  1876 
  1877     if (!(window->flags & SDL_WINDOW_SHOWN)) {
  1878         return;
  1879     }
  1880     if (_this->RaiseWindow) {
  1881         _this->RaiseWindow(_this, window);
  1882     }
  1883 }
  1884 
  1885 void
  1886 SDL_MaximizeWindow(SDL_Window * window)
  1887 {
  1888     CHECK_WINDOW_MAGIC(window,);
  1889 
  1890     if (window->flags & SDL_WINDOW_MAXIMIZED) {
  1891         return;
  1892     }
  1893 
  1894     /* !!! FIXME: should this check if the window is resizable? */
  1895 
  1896     if (_this->MaximizeWindow) {
  1897         _this->MaximizeWindow(_this, window);
  1898     }
  1899 }
  1900 
  1901 void
  1902 SDL_MinimizeWindow(SDL_Window * window)
  1903 {
  1904     CHECK_WINDOW_MAGIC(window,);
  1905 
  1906     if (window->flags & SDL_WINDOW_MINIMIZED) {
  1907         return;
  1908     }
  1909 
  1910     SDL_UpdateFullscreenMode(window, SDL_FALSE);
  1911 
  1912     if (_this->MinimizeWindow) {
  1913         _this->MinimizeWindow(_this, window);
  1914     }
  1915 }
  1916 
  1917 void
  1918 SDL_RestoreWindow(SDL_Window * window)
  1919 {
  1920     CHECK_WINDOW_MAGIC(window,);
  1921 
  1922     if (!(window->flags & (SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED))) {
  1923         return;
  1924     }
  1925 
  1926     if (_this->RestoreWindow) {
  1927         _this->RestoreWindow(_this, window);
  1928     }
  1929 }
  1930 
  1931 int
  1932 SDL_SetWindowFullscreen(SDL_Window * window, Uint32 flags)
  1933 {
  1934     CHECK_WINDOW_MAGIC(window, -1);
  1935 
  1936     flags &= FULLSCREEN_MASK;
  1937 
  1938     if (flags == (window->flags & FULLSCREEN_MASK)) {
  1939         return 0;
  1940     }
  1941 
  1942     /* clear the previous flags and OR in the new ones */
  1943     window->flags &= ~FULLSCREEN_MASK;
  1944     window->flags |= flags;
  1945 
  1946     return SDL_UpdateFullscreenMode(window, FULLSCREEN_VISIBLE(window));
  1947 }
  1948 
  1949 static SDL_Surface *
  1950 SDL_CreateWindowFramebuffer(SDL_Window * window)
  1951 {
  1952     Uint32 format;
  1953     void *pixels;
  1954     int pitch;
  1955     int bpp;
  1956     Uint32 Rmask, Gmask, Bmask, Amask;
  1957 
  1958     if (!_this->CreateWindowFramebuffer || !_this->UpdateWindowFramebuffer) {
  1959         return NULL;
  1960     }
  1961 
  1962     if (_this->CreateWindowFramebuffer(_this, window, &format, &pixels, &pitch) < 0) {
  1963         return NULL;
  1964     }
  1965 
  1966     if (!SDL_PixelFormatEnumToMasks(format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
  1967         return NULL;
  1968     }
  1969 
  1970     return SDL_CreateRGBSurfaceFrom(pixels, window->w, window->h, bpp, pitch, Rmask, Gmask, Bmask, Amask);
  1971 }
  1972 
  1973 SDL_Surface *
  1974 SDL_GetWindowSurface(SDL_Window * window)
  1975 {
  1976     CHECK_WINDOW_MAGIC(window, NULL);
  1977 
  1978     if (!window->surface_valid) {
  1979         if (window->surface) {
  1980             window->surface->flags &= ~SDL_DONTFREE;
  1981             SDL_FreeSurface(window->surface);
  1982         }
  1983         window->surface = SDL_CreateWindowFramebuffer(window);
  1984         if (window->surface) {
  1985             window->surface_valid = SDL_TRUE;
  1986             window->surface->flags |= SDL_DONTFREE;
  1987         }
  1988     }
  1989     return window->surface;
  1990 }
  1991 
  1992 int
  1993 SDL_UpdateWindowSurface(SDL_Window * window)
  1994 {
  1995     SDL_Rect full_rect;
  1996 
  1997     CHECK_WINDOW_MAGIC(window, -1);
  1998 
  1999     full_rect.x = 0;
  2000     full_rect.y = 0;
  2001     full_rect.w = window->w;
  2002     full_rect.h = window->h;
  2003     return SDL_UpdateWindowSurfaceRects(window, &full_rect, 1);
  2004 }
  2005 
  2006 int
  2007 SDL_UpdateWindowSurfaceRects(SDL_Window * window, const SDL_Rect * rects,
  2008                              int numrects)
  2009 {
  2010     CHECK_WINDOW_MAGIC(window, -1);
  2011 
  2012     if (!window->surface_valid) {
  2013         return SDL_SetError("Window surface is invalid, please call SDL_GetWindowSurface() to get a new surface");
  2014     }
  2015 
  2016     return _this->UpdateWindowFramebuffer(_this, window, rects, numrects);
  2017 }
  2018 
  2019 int
  2020 SDL_SetWindowBrightness(SDL_Window * window, float brightness)
  2021 {
  2022     Uint16 ramp[256];
  2023     int status;
  2024 
  2025     CHECK_WINDOW_MAGIC(window, -1);
  2026 
  2027     SDL_CalculateGammaRamp(brightness, ramp);
  2028     status = SDL_SetWindowGammaRamp(window, ramp, ramp, ramp);
  2029     if (status == 0) {
  2030         window->brightness = brightness;
  2031     }
  2032     return status;
  2033 }
  2034 
  2035 float
  2036 SDL_GetWindowBrightness(SDL_Window * window)
  2037 {
  2038     CHECK_WINDOW_MAGIC(window, 1.0f);
  2039 
  2040     return window->brightness;
  2041 }
  2042 
  2043 int
  2044 SDL_SetWindowGammaRamp(SDL_Window * window, const Uint16 * red,
  2045                                             const Uint16 * green,
  2046                                             const Uint16 * blue)
  2047 {
  2048     CHECK_WINDOW_MAGIC(window, -1);
  2049 
  2050     if (!_this->SetWindowGammaRamp) {
  2051         return SDL_Unsupported();
  2052     }
  2053 
  2054     if (!window->gamma) {
  2055         if (SDL_GetWindowGammaRamp(window, NULL, NULL, NULL) < 0) {
  2056             return -1;
  2057         }
  2058         SDL_assert(window->gamma != NULL);
  2059     }
  2060 
  2061     if (red) {
  2062         SDL_memcpy(&window->gamma[0*256], red, 256*sizeof(Uint16));
  2063     }
  2064     if (green) {
  2065         SDL_memcpy(&window->gamma[1*256], green, 256*sizeof(Uint16));
  2066     }
  2067     if (blue) {
  2068         SDL_memcpy(&window->gamma[2*256], blue, 256*sizeof(Uint16));
  2069     }
  2070     if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
  2071         return _this->SetWindowGammaRamp(_this, window, window->gamma);
  2072     } else {
  2073         return 0;
  2074     }
  2075 }
  2076 
  2077 int
  2078 SDL_GetWindowGammaRamp(SDL_Window * window, Uint16 * red,
  2079                                             Uint16 * green,
  2080                                             Uint16 * blue)
  2081 {
  2082     CHECK_WINDOW_MAGIC(window, -1);
  2083 
  2084     if (!window->gamma) {
  2085         int i;
  2086 
  2087         window->gamma = (Uint16 *)SDL_malloc(256*6*sizeof(Uint16));
  2088         if (!window->gamma) {
  2089             return SDL_OutOfMemory();
  2090         }
  2091         window->saved_gamma = window->gamma + 3*256;
  2092 
  2093         if (_this->GetWindowGammaRamp) {
  2094             if (_this->GetWindowGammaRamp(_this, window, window->gamma) < 0) {
  2095                 return -1;
  2096             }
  2097         } else {
  2098             /* Create an identity gamma ramp */
  2099             for (i = 0; i < 256; ++i) {
  2100                 Uint16 value = (Uint16)((i << 8) | i);
  2101 
  2102                 window->gamma[0*256+i] = value;
  2103                 window->gamma[1*256+i] = value;
  2104                 window->gamma[2*256+i] = value;
  2105             }
  2106         }
  2107         SDL_memcpy(window->saved_gamma, window->gamma, 3*256*sizeof(Uint16));
  2108     }
  2109 
  2110     if (red) {
  2111         SDL_memcpy(red, &window->gamma[0*256], 256*sizeof(Uint16));
  2112     }
  2113     if (green) {
  2114         SDL_memcpy(green, &window->gamma[1*256], 256*sizeof(Uint16));
  2115     }
  2116     if (blue) {
  2117         SDL_memcpy(blue, &window->gamma[2*256], 256*sizeof(Uint16));
  2118     }
  2119     return 0;
  2120 }
  2121 
  2122 void
  2123 SDL_UpdateWindowGrab(SDL_Window * window)
  2124 {
  2125     if (_this->SetWindowGrab) {
  2126         SDL_Window *grabbed_window;
  2127         SDL_bool grabbed;
  2128         if ((SDL_GetMouse()->relative_mode || (window->flags & SDL_WINDOW_INPUT_GRABBED)) &&
  2129              (window->flags & SDL_WINDOW_INPUT_FOCUS)) {
  2130             grabbed = SDL_TRUE;
  2131         } else {
  2132             grabbed = SDL_FALSE;
  2133         }
  2134 
  2135         grabbed_window = _this->grabbed_window;
  2136         if (grabbed) {
  2137             if (grabbed_window && (grabbed_window != window)) {
  2138                 /* stealing a grab from another window! */
  2139                 grabbed_window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
  2140                 _this->SetWindowGrab(_this, grabbed_window, SDL_FALSE);
  2141             }
  2142             _this->grabbed_window = window;
  2143         } else if (grabbed_window == window) {
  2144             _this->grabbed_window = NULL;  /* ungrabbing. */
  2145         }
  2146 
  2147         _this->SetWindowGrab(_this, window, grabbed);
  2148     }
  2149 }
  2150 
  2151 void
  2152 SDL_SetWindowGrab(SDL_Window * window, SDL_bool grabbed)
  2153 {
  2154     CHECK_WINDOW_MAGIC(window,);
  2155 
  2156     if (!!grabbed == !!(window->flags & SDL_WINDOW_INPUT_GRABBED)) {
  2157         return;
  2158     }
  2159     if (grabbed) {
  2160         window->flags |= SDL_WINDOW_INPUT_GRABBED;
  2161     } else {
  2162         window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
  2163     }
  2164     SDL_UpdateWindowGrab(window);
  2165 }
  2166 
  2167 SDL_bool
  2168 SDL_GetWindowGrab(SDL_Window * window)
  2169 {
  2170     CHECK_WINDOW_MAGIC(window, SDL_FALSE);
  2171     SDL_assert(!_this->grabbed_window || ((_this->grabbed_window->flags & SDL_WINDOW_INPUT_GRABBED) != 0));
  2172     return window == _this->grabbed_window;
  2173 }
  2174 
  2175 SDL_Window *
  2176 SDL_GetGrabbedWindow(void)
  2177 {
  2178     SDL_assert(!_this->grabbed_window || ((_this->grabbed_window->flags & SDL_WINDOW_INPUT_GRABBED) != 0));
  2179     return _this->grabbed_window;
  2180 }
  2181 
  2182 void
  2183 SDL_OnWindowShown(SDL_Window * window)
  2184 {
  2185     SDL_OnWindowRestored(window);
  2186 }
  2187 
  2188 void
  2189 SDL_OnWindowHidden(SDL_Window * window)
  2190 {
  2191     SDL_UpdateFullscreenMode(window, SDL_FALSE);
  2192 }
  2193 
  2194 void
  2195 SDL_OnWindowResized(SDL_Window * window)
  2196 {
  2197     window->surface_valid = SDL_FALSE;
  2198     SDL_SendWindowEvent(window, SDL_WINDOWEVENT_SIZE_CHANGED, window->w, window->h);
  2199 }
  2200 
  2201 void
  2202 SDL_OnWindowMinimized(SDL_Window * window)
  2203 {
  2204     SDL_UpdateFullscreenMode(window, SDL_FALSE);
  2205 }
  2206 
  2207 void
  2208 SDL_OnWindowRestored(SDL_Window * window)
  2209 {
  2210     /*
  2211      * FIXME: Is this fine to just remove this, or should it be preserved just
  2212      * for the fullscreen case? In principle it seems like just hiding/showing
  2213      * windows shouldn't affect the stacking order; maybe the right fix is to
  2214      * re-decouple OnWindowShown and OnWindowRestored.
  2215      */
  2216     /*SDL_RaiseWindow(window);*/
  2217 
  2218     if (FULLSCREEN_VISIBLE(window)) {
  2219         SDL_UpdateFullscreenMode(window, SDL_TRUE);
  2220     }
  2221 }
  2222 
  2223 void
  2224 SDL_OnWindowEnter(SDL_Window * window)
  2225 {
  2226     if (_this->OnWindowEnter) {
  2227         _this->OnWindowEnter(_this, window);
  2228     }
  2229 }
  2230 
  2231 void
  2232 SDL_OnWindowLeave(SDL_Window * window)
  2233 {
  2234 }
  2235 
  2236 void
  2237 SDL_OnWindowFocusGained(SDL_Window * window)
  2238 {
  2239     SDL_Mouse *mouse = SDL_GetMouse();
  2240 
  2241     if (window->gamma && _this->SetWindowGammaRamp) {
  2242         _this->SetWindowGammaRamp(_this, window, window->gamma);
  2243     }
  2244 
  2245     if (mouse && mouse->relative_mode) {
  2246         SDL_SetMouseFocus(window);
  2247         SDL_WarpMouseInWindow(window, window->w/2, window->h/2);
  2248     }
  2249 
  2250     SDL_UpdateWindowGrab(window);
  2251 }
  2252 
  2253 static SDL_bool
  2254 ShouldMinimizeOnFocusLoss(SDL_Window * window)
  2255 {
  2256     const char *hint;
  2257 
  2258     if (!(window->flags & SDL_WINDOW_FULLSCREEN) || window->is_destroying) {
  2259         return SDL_FALSE;
  2260     }
  2261 
  2262 #ifdef __MACOSX__
  2263     if (Cocoa_IsWindowInFullscreenSpace(window)) {
  2264         return SDL_FALSE;
  2265     }
  2266 #endif
  2267 
  2268     hint = SDL_GetHint(SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS);
  2269     if (hint) {
  2270         if (*hint == '0') {
  2271             return SDL_FALSE;
  2272         } else {
  2273             return SDL_TRUE;
  2274         }
  2275     }
  2276 
  2277     return SDL_TRUE;
  2278 }
  2279 
  2280 void
  2281 SDL_OnWindowFocusLost(SDL_Window * window)
  2282 {
  2283     if (window->gamma && _this->SetWindowGammaRamp) {
  2284         _this->SetWindowGammaRamp(_this, window, window->saved_gamma);
  2285     }
  2286 
  2287     SDL_UpdateWindowGrab(window);
  2288 
  2289     if (ShouldMinimizeOnFocusLoss(window)) {
  2290         SDL_MinimizeWindow(window);
  2291     }
  2292 }
  2293 
  2294 /* !!! FIXME: is this different than SDL_GetKeyboardFocus()?
  2295    !!! FIXME:  Also, SDL_GetKeyboardFocus() is O(1), this isn't. */
  2296 SDL_Window *
  2297 SDL_GetFocusWindow(void)
  2298 {
  2299     SDL_Window *window;
  2300 
  2301     if (!_this) {
  2302         return NULL;
  2303     }
  2304     for (window = _this->windows; window; window = window->next) {
  2305         if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
  2306             return window;
  2307         }
  2308     }
  2309     return NULL;
  2310 }
  2311 
  2312 void
  2313 SDL_DestroyWindow(SDL_Window * window)
  2314 {
  2315     SDL_VideoDisplay *display;
  2316 
  2317     CHECK_WINDOW_MAGIC(window,);
  2318 
  2319     window->is_destroying = SDL_TRUE;
  2320 
  2321     /* Restore video mode, etc. */
  2322     SDL_HideWindow(window);
  2323 
  2324     /* Make sure this window no longer has focus */
  2325     if (SDL_GetKeyboardFocus() == window) {
  2326         SDL_SetKeyboardFocus(NULL);
  2327     }
  2328     if (SDL_GetMouseFocus() == window) {
  2329         SDL_SetMouseFocus(NULL);
  2330     }
  2331 
  2332     /* make no context current if this is the current context window. */
  2333     if (window->flags & SDL_WINDOW_OPENGL) {
  2334         if (_this->current_glwin == window) {
  2335             SDL_GL_MakeCurrent(window, NULL);
  2336         }
  2337     }
  2338 
  2339     if (window->surface) {
  2340         window->surface->flags &= ~SDL_DONTFREE;
  2341         SDL_FreeSurface(window->surface);
  2342     }
  2343     if (_this->DestroyWindowFramebuffer) {
  2344         _this->DestroyWindowFramebuffer(_this, window);
  2345     }
  2346     if (_this->DestroyWindow) {
  2347         _this->DestroyWindow(_this, window);
  2348     }
  2349     if (window->flags & SDL_WINDOW_OPENGL) {
  2350         SDL_GL_UnloadLibrary();
  2351     }
  2352 
  2353     display = SDL_GetDisplayForWindow(window);
  2354     if (display->fullscreen_window == window) {
  2355         display->fullscreen_window = NULL;
  2356     }
  2357 
  2358     /* Now invalidate magic */
  2359     window->magic = NULL;
  2360 
  2361     /* Free memory associated with the window */
  2362     SDL_free(window->title);
  2363     SDL_FreeSurface(window->icon);
  2364     SDL_free(window->gamma);
  2365     while (window->data) {
  2366         SDL_WindowUserData *data = window->data;
  2367 
  2368         window->data = data->next;
  2369         SDL_free(data->name);
  2370         SDL_free(data);
  2371     }
  2372 
  2373     /* Unlink the window from the list */
  2374     if (window->next) {
  2375         window->next->prev = window->prev;
  2376     }
  2377     if (window->prev) {
  2378         window->prev->next = window->next;
  2379     } else {
  2380         _this->windows = window->next;
  2381     }
  2382 
  2383     SDL_free(window);
  2384 }
  2385 
  2386 SDL_bool
  2387 SDL_IsScreenSaverEnabled()
  2388 {
  2389     if (!_this) {
  2390         return SDL_TRUE;
  2391     }
  2392     return _this->suspend_screensaver ? SDL_FALSE : SDL_TRUE;
  2393 }
  2394 
  2395 void
  2396 SDL_EnableScreenSaver()
  2397 {
  2398     if (!_this) {
  2399         return;
  2400     }
  2401     if (!_this->suspend_screensaver) {
  2402         return;
  2403     }
  2404     _this->suspend_screensaver = SDL_FALSE;
  2405     if (_this->SuspendScreenSaver) {
  2406         _this->SuspendScreenSaver(_this);
  2407     }
  2408 }
  2409 
  2410 void
  2411 SDL_DisableScreenSaver()
  2412 {
  2413     if (!_this) {
  2414         return;
  2415     }
  2416     if (_this->suspend_screensaver) {
  2417         return;
  2418     }
  2419     _this->suspend_screensaver = SDL_TRUE;
  2420     if (_this->SuspendScreenSaver) {
  2421         _this->SuspendScreenSaver(_this);
  2422     }
  2423 }
  2424 
  2425 void
  2426 SDL_VideoQuit(void)
  2427 {
  2428     int i, j;
  2429 
  2430     if (!_this) {
  2431         return;
  2432     }
  2433 
  2434     /* Halt event processing before doing anything else */
  2435     SDL_TouchQuit();
  2436     SDL_MouseQuit();
  2437     SDL_KeyboardQuit();
  2438     SDL_QuitSubSystem(SDL_INIT_EVENTS);
  2439 
  2440     SDL_EnableScreenSaver();
  2441 
  2442     /* Clean up the system video */
  2443     while (_this->windows) {
  2444         SDL_DestroyWindow(_this->windows);
  2445     }
  2446     _this->VideoQuit(_this);
  2447 
  2448     for (i = 0; i < _this->num_displays; ++i) {
  2449         SDL_VideoDisplay *display = &_this->displays[i];
  2450         for (j = display->num_display_modes; j--;) {
  2451             SDL_free(display->display_modes[j].driverdata);
  2452             display->display_modes[j].driverdata = NULL;
  2453         }
  2454         SDL_free(display->display_modes);
  2455         display->display_modes = NULL;
  2456         SDL_free(display->desktop_mode.driverdata);
  2457         display->desktop_mode.driverdata = NULL;
  2458         SDL_free(display->driverdata);
  2459         display->driverdata = NULL;
  2460     }
  2461     if (_this->displays) {
  2462         for (i = 0; i < _this->num_displays; ++i) {
  2463             SDL_free(_this->displays[i].name);
  2464         }
  2465         SDL_free(_this->displays);
  2466         _this->displays = NULL;
  2467         _this->num_displays = 0;
  2468     }
  2469     SDL_free(_this->clipboard_text);
  2470     _this->clipboard_text = NULL;
  2471     _this->free(_this);
  2472     _this = NULL;
  2473 }
  2474 
  2475 int
  2476 SDL_GL_LoadLibrary(const char *path)
  2477 {
  2478     int retval;
  2479 
  2480     if (!_this) {
  2481         return SDL_UninitializedVideo();
  2482     }
  2483     if (_this->gl_config.driver_loaded) {
  2484         if (path && SDL_strcmp(path, _this->gl_config.driver_path) != 0) {
  2485             return SDL_SetError("OpenGL library already loaded");
  2486         }
  2487         retval = 0;
  2488     } else {
  2489         if (!_this->GL_LoadLibrary) {
  2490             return SDL_SetError("No dynamic GL support in video driver");
  2491         }
  2492         retval = _this->GL_LoadLibrary(_this, path);
  2493     }
  2494     if (retval == 0) {
  2495         ++_this->gl_config.driver_loaded;
  2496     } else {
  2497         if (_this->GL_UnloadLibrary) {
  2498             _this->GL_UnloadLibrary(_this);
  2499         }
  2500     }
  2501     return (retval);
  2502 }
  2503 
  2504 void *
  2505 SDL_GL_GetProcAddress(const char *proc)
  2506 {
  2507     void *func;
  2508 
  2509     if (!_this) {
  2510         SDL_UninitializedVideo();
  2511         return NULL;
  2512     }
  2513     func = NULL;
  2514     if (_this->GL_GetProcAddress) {
  2515         if (_this->gl_config.driver_loaded) {
  2516             func = _this->GL_GetProcAddress(_this, proc);
  2517         } else {
  2518             SDL_SetError("No GL driver has been loaded");
  2519         }
  2520     } else {
  2521         SDL_SetError("No dynamic GL support in video driver");
  2522     }
  2523     return func;
  2524 }
  2525 
  2526 void
  2527 SDL_GL_UnloadLibrary(void)
  2528 {
  2529     if (!_this) {
  2530         SDL_UninitializedVideo();
  2531         return;
  2532     }
  2533     if (_this->gl_config.driver_loaded > 0) {
  2534         if (--_this->gl_config.driver_loaded > 0) {
  2535             return;
  2536         }
  2537         if (_this->GL_UnloadLibrary) {
  2538             _this->GL_UnloadLibrary(_this);
  2539         }
  2540     }
  2541 }
  2542 
  2543 static SDL_INLINE SDL_bool
  2544 isAtLeastGL3(const char *verstr)
  2545 {
  2546     return (verstr && (SDL_atoi(verstr) >= 3));
  2547 }
  2548 
  2549 SDL_bool
  2550 SDL_GL_ExtensionSupported(const char *extension)
  2551 {
  2552 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
  2553     const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
  2554     const char *extensions;
  2555     const char *start;
  2556     const char *where, *terminator;
  2557 
  2558     /* Extension names should not have spaces. */
  2559     where = SDL_strchr(extension, ' ');
  2560     if (where || *extension == '\0') {
  2561         return SDL_FALSE;
  2562     }
  2563     /* See if there's an environment variable override */
  2564     start = SDL_getenv(extension);
  2565     if (start && *start == '0') {
  2566         return SDL_FALSE;
  2567     }
  2568 
  2569     /* Lookup the available extensions */
  2570 
  2571     glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
  2572     if (!glGetStringFunc) {
  2573         return SDL_FALSE;
  2574     }
  2575 
  2576     if (isAtLeastGL3((const char *) glGetStringFunc(GL_VERSION))) {
  2577         const GLubyte *(APIENTRY * glGetStringiFunc) (GLenum, GLuint);
  2578         void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2579         GLint num_exts = 0;
  2580         GLint i;
  2581 
  2582         glGetStringiFunc = SDL_GL_GetProcAddress("glGetStringi");
  2583         glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2584         if ((!glGetStringiFunc) || (!glGetIntegervFunc)) {
  2585             return SDL_FALSE;
  2586         }
  2587 
  2588         #ifndef GL_NUM_EXTENSIONS
  2589         #define GL_NUM_EXTENSIONS 0x821D
  2590         #endif
  2591         glGetIntegervFunc(GL_NUM_EXTENSIONS, &num_exts);
  2592         for (i = 0; i < num_exts; i++) {
  2593             const char *thisext = (const char *) glGetStringiFunc(GL_EXTENSIONS, i);
  2594             if (SDL_strcmp(thisext, extension) == 0) {
  2595                 return SDL_TRUE;
  2596             }
  2597         }
  2598 
  2599         return SDL_FALSE;
  2600     }
  2601 
  2602     /* Try the old way with glGetString(GL_EXTENSIONS) ... */
  2603 
  2604     extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
  2605     if (!extensions) {
  2606         return SDL_FALSE;
  2607     }
  2608     /*
  2609      * It takes a bit of care to be fool-proof about parsing the OpenGL
  2610      * extensions string. Don't be fooled by sub-strings, etc.
  2611      */
  2612 
  2613     start = extensions;
  2614 
  2615     for (;;) {
  2616         where = SDL_strstr(start, extension);
  2617         if (!where)
  2618             break;
  2619 
  2620         terminator = where + SDL_strlen(extension);
  2621         if (where == start || *(where - 1) == ' ')
  2622             if (*terminator == ' ' || *terminator == '\0')
  2623                 return SDL_TRUE;
  2624 
  2625         start = terminator;
  2626     }
  2627     return SDL_FALSE;
  2628 #else
  2629     return SDL_FALSE;
  2630 #endif
  2631 }
  2632 
  2633 void
  2634 SDL_GL_ResetAttributes()
  2635 {
  2636     if (!_this) {
  2637         return;
  2638     }
  2639 
  2640     _this->gl_config.red_size = 3;
  2641     _this->gl_config.green_size = 3;
  2642     _this->gl_config.blue_size = 2;
  2643     _this->gl_config.alpha_size = 0;
  2644     _this->gl_config.buffer_size = 0;
  2645     _this->gl_config.depth_size = 16;
  2646     _this->gl_config.stencil_size = 0;
  2647     _this->gl_config.double_buffer = 1;
  2648     _this->gl_config.accum_red_size = 0;
  2649     _this->gl_config.accum_green_size = 0;
  2650     _this->gl_config.accum_blue_size = 0;
  2651     _this->gl_config.accum_alpha_size = 0;
  2652     _this->gl_config.stereo = 0;
  2653     _this->gl_config.multisamplebuffers = 0;
  2654     _this->gl_config.multisamplesamples = 0;
  2655     _this->gl_config.retained_backing = 1;
  2656     _this->gl_config.accelerated = -1;  /* accelerated or not, both are fine */
  2657     _this->gl_config.profile_mask = 0;
  2658 #if SDL_VIDEO_OPENGL
  2659     _this->gl_config.major_version = 2;
  2660     _this->gl_config.minor_version = 1;
  2661 #elif SDL_VIDEO_OPENGL_ES2
  2662     _this->gl_config.major_version = 2;
  2663     _this->gl_config.minor_version = 0;
  2664     _this->gl_config.profile_mask = SDL_GL_CONTEXT_PROFILE_ES;
  2665 #elif SDL_VIDEO_OPENGL_ES
  2666     _this->gl_config.major_version = 1;
  2667     _this->gl_config.minor_version = 1;
  2668     _this->gl_config.profile_mask = SDL_GL_CONTEXT_PROFILE_ES;
  2669 #endif
  2670     _this->gl_config.flags = 0;
  2671     _this->gl_config.framebuffer_srgb_capable = 0;
  2672     _this->gl_config.release_behavior = SDL_GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH;
  2673 
  2674     _this->gl_config.share_with_current_context = 0;
  2675 }
  2676 
  2677 int
  2678 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
  2679 {
  2680 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
  2681     int retval;
  2682 
  2683     if (!_this) {
  2684         return SDL_UninitializedVideo();
  2685     }
  2686     retval = 0;
  2687     switch (attr) {
  2688     case SDL_GL_RED_SIZE:
  2689         _this->gl_config.red_size = value;
  2690         break;
  2691     case SDL_GL_GREEN_SIZE:
  2692         _this->gl_config.green_size = value;
  2693         break;
  2694     case SDL_GL_BLUE_SIZE:
  2695         _this->gl_config.blue_size = value;
  2696         break;
  2697     case SDL_GL_ALPHA_SIZE:
  2698         _this->gl_config.alpha_size = value;
  2699         break;
  2700     case SDL_GL_DOUBLEBUFFER:
  2701         _this->gl_config.double_buffer = value;
  2702         break;
  2703     case SDL_GL_BUFFER_SIZE:
  2704         _this->gl_config.buffer_size = value;
  2705         break;
  2706     case SDL_GL_DEPTH_SIZE:
  2707         _this->gl_config.depth_size = value;
  2708         break;
  2709     case SDL_GL_STENCIL_SIZE:
  2710         _this->gl_config.stencil_size = value;
  2711         break;
  2712     case SDL_GL_ACCUM_RED_SIZE:
  2713         _this->gl_config.accum_red_size = value;
  2714         break;
  2715     case SDL_GL_ACCUM_GREEN_SIZE:
  2716         _this->gl_config.accum_green_size = value;
  2717         break;
  2718     case SDL_GL_ACCUM_BLUE_SIZE:
  2719         _this->gl_config.accum_blue_size = value;
  2720         break;
  2721     case SDL_GL_ACCUM_ALPHA_SIZE:
  2722         _this->gl_config.accum_alpha_size = value;
  2723         break;
  2724     case SDL_GL_STEREO:
  2725         _this->gl_config.stereo = value;
  2726         break;
  2727     case SDL_GL_MULTISAMPLEBUFFERS:
  2728         _this->gl_config.multisamplebuffers = value;
  2729         break;
  2730     case SDL_GL_MULTISAMPLESAMPLES:
  2731         _this->gl_config.multisamplesamples = value;
  2732         break;
  2733     case SDL_GL_ACCELERATED_VISUAL:
  2734         _this->gl_config.accelerated = value;
  2735         break;
  2736     case SDL_GL_RETAINED_BACKING:
  2737         _this->gl_config.retained_backing = value;
  2738         break;
  2739     case SDL_GL_CONTEXT_MAJOR_VERSION:
  2740         _this->gl_config.major_version = value;
  2741         break;
  2742     case SDL_GL_CONTEXT_MINOR_VERSION:
  2743         _this->gl_config.minor_version = value;
  2744         break;
  2745     case SDL_GL_CONTEXT_EGL:
  2746         /* FIXME: SDL_GL_CONTEXT_EGL to be deprecated in SDL 2.1 */
  2747         if (value != 0) {
  2748             SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
  2749         } else {
  2750             SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, 0);
  2751         };
  2752         break;
  2753     case SDL_GL_CONTEXT_FLAGS:
  2754         if (value & ~(SDL_GL_CONTEXT_DEBUG_FLAG |
  2755                       SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG |
  2756                       SDL_GL_CONTEXT_ROBUST_ACCESS_FLAG |
  2757                       SDL_GL_CONTEXT_RESET_ISOLATION_FLAG)) {
  2758             retval = SDL_SetError("Unknown OpenGL context flag %d", value);
  2759             break;
  2760         }
  2761         _this->gl_config.flags = value;
  2762         break;
  2763     case SDL_GL_CONTEXT_PROFILE_MASK:
  2764         if (value != 0 &&
  2765             value != SDL_GL_CONTEXT_PROFILE_CORE &&
  2766             value != SDL_GL_CONTEXT_PROFILE_COMPATIBILITY &&
  2767             value != SDL_GL_CONTEXT_PROFILE_ES) {
  2768             retval = SDL_SetError("Unknown OpenGL context profile %d", value);
  2769             break;
  2770         }
  2771         _this->gl_config.profile_mask = value;
  2772         break;
  2773     case SDL_GL_SHARE_WITH_CURRENT_CONTEXT:
  2774         _this->gl_config.share_with_current_context = value;
  2775         break;
  2776     case SDL_GL_FRAMEBUFFER_SRGB_CAPABLE:
  2777         _this->gl_config.framebuffer_srgb_capable = value;
  2778         break;
  2779     case SDL_GL_CONTEXT_RELEASE_BEHAVIOR:
  2780         _this->gl_config.release_behavior = value;
  2781         break;
  2782     default:
  2783         retval = SDL_SetError("Unknown OpenGL attribute");
  2784         break;
  2785     }
  2786     return retval;
  2787 #else
  2788     return SDL_Unsupported();
  2789 #endif /* SDL_VIDEO_OPENGL */
  2790 }
  2791 
  2792 int
  2793 SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
  2794 {
  2795 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
  2796     void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2797     GLenum(APIENTRY * glGetErrorFunc) (void);
  2798     GLenum attrib = 0;
  2799     GLenum error = 0;
  2800 
  2801     glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2802     if (!glGetIntegervFunc) {
  2803         return -1;
  2804     }
  2805 
  2806     glGetErrorFunc = SDL_GL_GetProcAddress("glGetError");
  2807     if (!glGetErrorFunc) {
  2808         return -1;
  2809     }
  2810 
  2811     /* Clear value in any case */
  2812     *value = 0;
  2813 
  2814     switch (attr) {
  2815     case SDL_GL_RED_SIZE:
  2816         attrib = GL_RED_BITS;
  2817         break;
  2818     case SDL_GL_BLUE_SIZE:
  2819         attrib = GL_BLUE_BITS;
  2820         break;
  2821     case SDL_GL_GREEN_SIZE:
  2822         attrib = GL_GREEN_BITS;
  2823         break;
  2824     case SDL_GL_ALPHA_SIZE:
  2825         attrib = GL_ALPHA_BITS;
  2826         break;
  2827     case SDL_GL_DOUBLEBUFFER:
  2828 #if SDL_VIDEO_OPENGL
  2829         attrib = GL_DOUBLEBUFFER;
  2830         break;
  2831 #else
  2832         /* OpenGL ES 1.0 and above specifications have EGL_SINGLE_BUFFER      */
  2833         /* parameter which switches double buffer to single buffer. OpenGL ES */
  2834         /* SDL driver must set proper value after initialization              */
  2835         *value = _this->gl_config.double_buffer;
  2836         return 0;
  2837 #endif
  2838     case SDL_GL_DEPTH_SIZE:
  2839         attrib = GL_DEPTH_BITS;
  2840         break;
  2841     case SDL_GL_STENCIL_SIZE:
  2842         attrib = GL_STENCIL_BITS;
  2843         break;
  2844 #if SDL_VIDEO_OPENGL
  2845     case SDL_GL_ACCUM_RED_SIZE:
  2846         attrib = GL_ACCUM_RED_BITS;
  2847         break;
  2848     case SDL_GL_ACCUM_GREEN_SIZE:
  2849         attrib = GL_ACCUM_GREEN_BITS;
  2850         break;
  2851     case SDL_GL_ACCUM_BLUE_SIZE:
  2852         attrib = GL_ACCUM_BLUE_BITS;
  2853         break;
  2854     case SDL_GL_ACCUM_ALPHA_SIZE:
  2855         attrib = GL_ACCUM_ALPHA_BITS;
  2856         break;
  2857     case SDL_GL_STEREO:
  2858         attrib = GL_STEREO;
  2859         break;
  2860 #else
  2861     case SDL_GL_ACCUM_RED_SIZE:
  2862     case SDL_GL_ACCUM_GREEN_SIZE:
  2863     case SDL_GL_ACCUM_BLUE_SIZE:
  2864     case SDL_GL_ACCUM_ALPHA_SIZE:
  2865     case SDL_GL_STEREO:
  2866         /* none of these are supported in OpenGL ES */
  2867         *value = 0;
  2868         return 0;
  2869 #endif
  2870     case SDL_GL_MULTISAMPLEBUFFERS:
  2871 #if SDL_VIDEO_OPENGL
  2872         attrib = GL_SAMPLE_BUFFERS_ARB;
  2873 #else
  2874         attrib = GL_SAMPLE_BUFFERS;
  2875 #endif
  2876         break;
  2877     case SDL_GL_MULTISAMPLESAMPLES:
  2878 #if SDL_VIDEO_OPENGL
  2879         attrib = GL_SAMPLES_ARB;
  2880 #else
  2881         attrib = GL_SAMPLES;
  2882 #endif
  2883         break;
  2884     case SDL_GL_CONTEXT_RELEASE_BEHAVIOR:
  2885 #if SDL_VIDEO_OPENGL
  2886         attrib = GL_CONTEXT_RELEASE_BEHAVIOR;
  2887 #else
  2888         attrib = GL_CONTEXT_RELEASE_BEHAVIOR_KHR;
  2889 #endif
  2890         break;
  2891     case SDL_GL_BUFFER_SIZE:
  2892         {
  2893             GLint bits = 0;
  2894             GLint component;
  2895 
  2896             /*
  2897              * there doesn't seem to be a single flag in OpenGL
  2898              * for this!
  2899              */
  2900             glGetIntegervFunc(GL_RED_BITS, &component);
  2901             bits += component;
  2902             glGetIntegervFunc(GL_GREEN_BITS, &component);
  2903             bits += component;
  2904             glGetIntegervFunc(GL_BLUE_BITS, &component);
  2905             bits += component;
  2906             glGetIntegervFunc(GL_ALPHA_BITS, &component);
  2907             bits += component;
  2908 
  2909             *value = bits;
  2910             return 0;
  2911         }
  2912     case SDL_GL_ACCELERATED_VISUAL:
  2913         {
  2914             /* FIXME: How do we get this information? */
  2915             *value = (_this->gl_config.accelerated != 0);
  2916             return 0;
  2917         }
  2918     case SDL_GL_RETAINED_BACKING:
  2919         {
  2920             *value = _this->gl_config.retained_backing;
  2921             return 0;
  2922         }
  2923     case SDL_GL_CONTEXT_MAJOR_VERSION:
  2924         {
  2925             *value = _this->gl_config.major_version;
  2926             return 0;
  2927         }
  2928     case SDL_GL_CONTEXT_MINOR_VERSION:
  2929         {
  2930             *value = _this->gl_config.minor_version;
  2931             return 0;
  2932         }
  2933     case SDL_GL_CONTEXT_EGL:
  2934         /* FIXME: SDL_GL_CONTEXT_EGL to be deprecated in SDL 2.1 */
  2935         {
  2936             if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {
  2937                 *value = 1;
  2938             }
  2939             else {
  2940                 *value = 0;
  2941             }
  2942             return 0;
  2943         }
  2944     case SDL_GL_CONTEXT_FLAGS:
  2945         {
  2946             *value = _this->gl_config.flags;
  2947             return 0;
  2948         }
  2949     case SDL_GL_CONTEXT_PROFILE_MASK:
  2950         {
  2951             *value = _this->gl_config.profile_mask;
  2952             return 0;
  2953         }
  2954     case SDL_GL_SHARE_WITH_CURRENT_CONTEXT:
  2955         {
  2956             *value = _this->gl_config.share_with_current_context;
  2957             return 0;
  2958         }
  2959     case SDL_GL_FRAMEBUFFER_SRGB_CAPABLE:
  2960         {
  2961             *value = _this->gl_config.framebuffer_srgb_capable;
  2962             return 0;
  2963         }
  2964     default:
  2965         return SDL_SetError("Unknown OpenGL attribute");
  2966     }
  2967 
  2968     glGetIntegervFunc(attrib, (GLint *) value);
  2969     error = glGetErrorFunc();
  2970     if (error != GL_NO_ERROR) {
  2971         if (error == GL_INVALID_ENUM) {
  2972             return SDL_SetError("OpenGL error: GL_INVALID_ENUM");
  2973         } else if (error == GL_INVALID_VALUE) {
  2974             return SDL_SetError("OpenGL error: GL_INVALID_VALUE");
  2975         }
  2976         return SDL_SetError("OpenGL error: %08X", error);
  2977     }
  2978     return 0;
  2979 #else
  2980     return SDL_Unsupported();
  2981 #endif /* SDL_VIDEO_OPENGL */
  2982 }
  2983 
  2984 SDL_GLContext
  2985 SDL_GL_CreateContext(SDL_Window * window)
  2986 {
  2987     SDL_GLContext ctx = NULL;
  2988     CHECK_WINDOW_MAGIC(window, NULL);
  2989 
  2990     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2991         SDL_SetError("The specified window isn't an OpenGL window");
  2992         return NULL;
  2993     }
  2994 
  2995     ctx = _this->GL_CreateContext(_this, window);
  2996 
  2997     /* Creating a context is assumed to make it current in the SDL driver. */
  2998     if (ctx) {
  2999         _this->current_glwin = window;
  3000         _this->current_glctx = ctx;
  3001         SDL_TLSSet(_this->current_glwin_tls, window, NULL);
  3002         SDL_TLSSet(_this->current_glctx_tls, ctx, NULL);
  3003     }
  3004     return ctx;
  3005 }
  3006 
  3007 int
  3008 SDL_GL_MakeCurrent(SDL_Window * window, SDL_GLContext ctx)
  3009 {
  3010     int retval;
  3011 
  3012     if (window == SDL_GL_GetCurrentWindow() &&
  3013         ctx == SDL_GL_GetCurrentContext()) {
  3014         /* We're already current. */
  3015         return 0;
  3016     }
  3017 
  3018     if (!ctx) {
  3019         window = NULL;
  3020     } else {
  3021         CHECK_WINDOW_MAGIC(window, -1);
  3022 
  3023         if (!(window->flags & SDL_WINDOW_OPENGL)) {
  3024             return SDL_SetError("The specified window isn't an OpenGL window");
  3025         }
  3026     }
  3027 
  3028     retval = _this->GL_MakeCurrent(_this, window, ctx);
  3029     if (retval == 0) {
  3030         _this->current_glwin = window;
  3031         _this->current_glctx = ctx;
  3032         SDL_TLSSet(_this->current_glwin_tls, window, NULL);
  3033         SDL_TLSSet(_this->current_glctx_tls, ctx, NULL);
  3034     }
  3035     return retval;
  3036 }
  3037 
  3038 SDL_Window *
  3039 SDL_GL_GetCurrentWindow(void)
  3040 {
  3041     if (!_this) {
  3042         SDL_UninitializedVideo();
  3043         return NULL;
  3044     }
  3045     return (SDL_Window *)SDL_TLSGet(_this->current_glwin_tls);
  3046 }
  3047 
  3048 SDL_GLContext
  3049 SDL_GL_GetCurrentContext(void)
  3050 {
  3051     if (!_this) {
  3052         SDL_UninitializedVideo();
  3053         return NULL;
  3054     }
  3055     return (SDL_GLContext)SDL_TLSGet(_this->current_glctx_tls);
  3056 }
  3057 
  3058 void SDL_GL_GetDrawableSize(SDL_Window * window, int *w, int *h)
  3059 {
  3060     CHECK_WINDOW_MAGIC(window,);
  3061 
  3062     if (_this->GL_GetDrawableSize) {
  3063         _this->GL_GetDrawableSize(_this, window, w, h);
  3064     } else {
  3065         SDL_GetWindowSize(window, w, h);
  3066     }
  3067 }
  3068 
  3069 int
  3070 SDL_GL_SetSwapInterval(int interval)
  3071 {
  3072     if (!_this) {
  3073         return SDL_UninitializedVideo();
  3074     } else if (SDL_GL_GetCurrentContext() == NULL) {
  3075         return SDL_SetError("No OpenGL context has been made current");
  3076     } else if (_this->GL_SetSwapInterval) {
  3077         return _this->GL_SetSwapInterval(_this, interval);
  3078     } else {
  3079         return SDL_SetError("Setting the swap interval is not supported");
  3080     }
  3081 }
  3082 
  3083 int
  3084 SDL_GL_GetSwapInterval(void)
  3085 {
  3086     if (!_this) {
  3087         return 0;
  3088     } else if (SDL_GL_GetCurrentContext() == NULL) {
  3089         return 0;
  3090     } else if (_this->GL_GetSwapInterval) {
  3091         return _this->GL_GetSwapInterval(_this);
  3092     } else {
  3093         return 0;
  3094     }
  3095 }
  3096 
  3097 void
  3098 SDL_GL_SwapWindow(SDL_Window * window)
  3099 {
  3100     CHECK_WINDOW_MAGIC(window,);
  3101 
  3102     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  3103         SDL_SetError("The specified window isn't an OpenGL window");
  3104         return;
  3105     }
  3106 
  3107     if (SDL_GL_GetCurrentWindow() != window) {
  3108         SDL_SetError("The specified window has not been made current");
  3109         return;
  3110     }
  3111 
  3112     _this->GL_SwapWindow(_this, window);
  3113 }
  3114 
  3115 void
  3116 SDL_GL_DeleteContext(SDL_GLContext context)
  3117 {
  3118     if (!_this || !context) {
  3119         return;
  3120     }
  3121 
  3122     if (SDL_GL_GetCurrentContext() == context) {
  3123         SDL_GL_MakeCurrent(NULL, NULL);
  3124     }
  3125 
  3126     _this->GL_DeleteContext(_this, context);
  3127 }
  3128 
  3129 #if 0                           /* FIXME */
  3130 /*
  3131  * Utility function used by SDL_WM_SetIcon(); flags & 1 for color key, flags
  3132  * & 2 for alpha channel.
  3133  */
  3134 static void
  3135 CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
  3136 {
  3137     int x, y;
  3138     Uint32 colorkey;
  3139 #define SET_MASKBIT(icon, x, y, mask) \
  3140     mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  3141 
  3142     colorkey = icon->format->colorkey;
  3143     switch (icon->format->BytesPerPixel) {
  3144     case 1:
  3145         {
  3146             Uint8 *pixels;
  3147             for (y = 0; y < icon->h; ++y) {
  3148                 pixels = (Uint8 *) icon->pixels + y * icon->pitch;
  3149                 for (x = 0; x < icon->w; ++x) {
  3150                     if (*pixels++ == colorkey) {
  3151                         SET_MASKBIT(icon, x, y, mask);
  3152                     }
  3153                 }
  3154             }
  3155         }
  3156         break;
  3157 
  3158     case 2:
  3159         {
  3160             Uint16 *pixels;
  3161             for (y = 0; y < icon->h; ++y) {
  3162                 pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
  3163                 for (x = 0; x < icon->w; ++x) {
  3164                     if ((flags & 1) && *pixels == colorkey) {
  3165                         SET_MASKBIT(icon, x, y, mask);
  3166                     } else if ((flags & 2)
  3167                                && (*pixels & icon->format->Amask) == 0) {
  3168                         SET_MASKBIT(icon, x, y, mask);
  3169                     }
  3170                     pixels++;
  3171                 }
  3172             }
  3173         }
  3174         break;
  3175 
  3176     case 4:
  3177         {
  3178             Uint32 *pixels;
  3179             for (y = 0; y < icon->h; ++y) {
  3180                 pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
  3181                 for (x = 0; x < icon->w; ++x) {
  3182                     if ((flags & 1) && *pixels == colorkey) {
  3183                         SET_MASKBIT(icon, x, y, mask);
  3184                     } else if ((flags & 2)
  3185                                && (*pixels & icon->format->Amask) == 0) {
  3186                         SET_MASKBIT(icon, x, y, mask);
  3187                     }
  3188                     pixels++;
  3189                 }
  3190             }
  3191         }
  3192         break;
  3193     }
  3194 }
  3195 
  3196 /*
  3197  * Sets the window manager icon for the display window.
  3198  */
  3199 void
  3200 SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
  3201 {
  3202     if (icon && _this->SetIcon) {
  3203         /* Generate a mask if necessary, and create the icon! */
  3204         if (mask == NULL) {
  3205             int mask_len = icon->h * (icon->w + 7) / 8;
  3206             int flags = 0;
  3207             mask = (Uint8 *) SDL_malloc(mask_len);
  3208             if (mask == NULL) {
  3209                 return;
  3210             }
  3211             SDL_memset(mask, ~0, mask_len);
  3212             if (icon->flags & SDL_SRCCOLORKEY)
  3213                 flags |= 1;
  3214             if (icon->flags & SDL_SRCALPHA)
  3215                 flags |= 2;
  3216             if (flags) {
  3217                 CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  3218             }
  3219             _this->SetIcon(_this, icon, mask);
  3220             SDL_free(mask);
  3221         } else {
  3222             _this->SetIcon(_this, icon, mask);
  3223         }
  3224     }
  3225 }
  3226 #endif
  3227 
  3228 SDL_bool
  3229 SDL_GetWindowWMInfo(SDL_Window * window, struct SDL_SysWMinfo *info)
  3230 {
  3231     CHECK_WINDOW_MAGIC(window, SDL_FALSE);
  3232 
  3233     if (!info) {
  3234         SDL_InvalidParamError("info");
  3235         return SDL_FALSE;
  3236     }
  3237     info->subsystem = SDL_SYSWM_UNKNOWN;
  3238 
  3239     if (!_this->GetWindowWMInfo) {
  3240         SDL_Unsupported();
  3241         return SDL_FALSE;
  3242     }
  3243     return (_this->GetWindowWMInfo(_this, window, info));
  3244 }
  3245 
  3246 void
  3247 SDL_StartTextInput(void)
  3248 {
  3249     SDL_Window *window;
  3250 
  3251     /* First, enable text events */
  3252     SDL_EventState(SDL_TEXTINPUT, SDL_ENABLE);
  3253     SDL_EventState(SDL_TEXTEDITING, SDL_ENABLE);
  3254 
  3255     /* Then show the on-screen keyboard, if any */
  3256     window = SDL_GetFocusWindow();
  3257     if (window && _this && _this->ShowScreenKeyboard) {
  3258         _this->ShowScreenKeyboard(_this, window);
  3259     }
  3260 
  3261     /* Finally start the text input system */
  3262     if (_this && _this->StartTextInput) {
  3263         _this->StartTextInput(_this);
  3264     }
  3265 }
  3266 
  3267 SDL_bool
  3268 SDL_IsTextInputActive(void)
  3269 {
  3270     return (SDL_GetEventState(SDL_TEXTINPUT) == SDL_ENABLE);
  3271 }
  3272 
  3273 void
  3274 SDL_StopTextInput(void)
  3275 {
  3276     SDL_Window *window;
  3277 
  3278     /* Stop the text input system */
  3279     if (_this && _this->StopTextInput) {
  3280         _this->StopTextInput(_this);
  3281     }
  3282 
  3283     /* Hide the on-screen keyboard, if any */
  3284     window = SDL_GetFocusWindow();
  3285     if (window && _this && _this->HideScreenKeyboard) {
  3286         _this->HideScreenKeyboard(_this, window);
  3287     }
  3288 
  3289     /* Finally disable text events */
  3290     SDL_EventState(SDL_TEXTINPUT, SDL_DISABLE);
  3291     SDL_EventState(SDL_TEXTEDITING, SDL_DISABLE);
  3292 }
  3293 
  3294 void
  3295 SDL_SetTextInputRect(SDL_Rect *rect)
  3296 {
  3297     if (_this && _this->SetTextInputRect) {
  3298         _this->SetTextInputRect(_this, rect);
  3299     }
  3300 }
  3301 
  3302 SDL_bool
  3303 SDL_HasScreenKeyboardSupport(void)
  3304 {
  3305     if (_this && _this->HasScreenKeyboardSupport) {
  3306         return _this->HasScreenKeyboardSupport(_this);
  3307     }
  3308     return SDL_FALSE;
  3309 }
  3310 
  3311 SDL_bool
  3312 SDL_IsScreenKeyboardShown(SDL_Window *window)
  3313 {
  3314     if (window && _this && _this->IsScreenKeyboardShown) {
  3315         return _this->IsScreenKeyboardShown(_this, window);
  3316     }
  3317     return SDL_FALSE;
  3318 }
  3319 
  3320 #if SDL_VIDEO_DRIVER_ANDROID
  3321 #include "android/SDL_androidmessagebox.h"
  3322 #endif
  3323 #if SDL_VIDEO_DRIVER_WINDOWS
  3324 #include "windows/SDL_windowsmessagebox.h"
  3325 #endif
  3326 #if SDL_VIDEO_DRIVER_WINRT
  3327 #include "winrt/SDL_winrtmessagebox.h"
  3328 #endif
  3329 #if SDL_VIDEO_DRIVER_COCOA
  3330 #include "cocoa/SDL_cocoamessagebox.h"
  3331 #endif
  3332 #if SDL_VIDEO_DRIVER_UIKIT
  3333 #include "uikit/SDL_uikitmessagebox.h"
  3334 #endif
  3335 #if SDL_VIDEO_DRIVER_X11
  3336 #include "x11/SDL_x11messagebox.h"
  3337 #endif
  3338 
  3339 // This function will be unused if none of the above video drivers are present.
  3340 SDL_UNUSED static SDL_bool SDL_MessageboxValidForDriver(const SDL_MessageBoxData *messageboxdata, SDL_SYSWM_TYPE drivertype)
  3341 {
  3342     SDL_SysWMinfo info;
  3343     SDL_Window *window = messageboxdata->window;
  3344 
  3345     if (!window) {
  3346         return SDL_TRUE;
  3347     }
  3348 
  3349     SDL_VERSION(&info.version);
  3350     if (!SDL_GetWindowWMInfo(window, &info)) {
  3351         return SDL_TRUE;
  3352     } else {
  3353         return (info.subsystem == drivertype);
  3354     }
  3355 }
  3356 
  3357 int
  3358 SDL_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
  3359 {
  3360     int dummybutton;
  3361     int retval = -1;
  3362     SDL_bool relative_mode;
  3363     int show_cursor_prev;
  3364     SDL_bool mouse_captured;
  3365     SDL_Window *current_window;
  3366 
  3367     if (!messageboxdata) {
  3368         return SDL_InvalidParamError("messageboxdata");
  3369     }
  3370 
  3371     current_window = SDL_GetKeyboardFocus();
  3372     mouse_captured = current_window && ((SDL_GetWindowFlags(current_window) & SDL_WINDOW_MOUSE_CAPTURE) != 0);
  3373     relative_mode = SDL_GetRelativeMouseMode();
  3374     SDL_CaptureMouse(SDL_FALSE);
  3375     SDL_SetRelativeMouseMode(SDL_FALSE);
  3376     show_cursor_prev = SDL_ShowCursor(1);
  3377 
  3378     if (!buttonid) {
  3379         buttonid = &dummybutton;
  3380     }
  3381 
  3382     if (_this && _this->ShowMessageBox) {
  3383         retval = _this->ShowMessageBox(_this, messageboxdata, buttonid);
  3384     }
  3385 
  3386     /* It's completely fine to call this function before video is initialized */
  3387 #if SDL_VIDEO_DRIVER_ANDROID
  3388     if (retval == -1 &&
  3389         Android_ShowMessageBox(messageboxdata, buttonid) == 0) {
  3390         retval = 0;
  3391     }
  3392 #endif
  3393 #if SDL_VIDEO_DRIVER_WINDOWS
  3394     if (retval == -1 &&
  3395         SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_WINDOWS) &&
  3396         WIN_ShowMessageBox(messageboxdata, buttonid) == 0) {
  3397         retval = 0;
  3398     }
  3399 #endif
  3400 #if SDL_VIDEO_DRIVER_WINRT
  3401     if (retval == -1 &&
  3402         SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_WINRT) &&
  3403         WINRT_ShowMessageBox(messageboxdata, buttonid) == 0) {
  3404         retval = 0;
  3405     }
  3406 #endif
  3407 #if SDL_VIDEO_DRIVER_COCOA
  3408     if (retval == -1 &&
  3409         SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_COCOA) &&
  3410         Cocoa_ShowMessageBox(messageboxdata, buttonid) == 0) {
  3411         retval = 0;
  3412     }
  3413 #endif
  3414 #if SDL_VIDEO_DRIVER_UIKIT
  3415     if (retval == -1 &&
  3416         SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_UIKIT) &&
  3417         UIKit_ShowMessageBox(messageboxdata, buttonid) == 0) {
  3418         retval = 0;
  3419     }
  3420 #endif
  3421 #if SDL_VIDEO_DRIVER_X11
  3422     if (retval == -1 &&
  3423         SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_X11) &&
  3424         X11_ShowMessageBox(messageboxdata, buttonid) == 0) {
  3425         retval = 0;
  3426     }
  3427 #endif
  3428     if (retval == -1) {
  3429         SDL_SetError("No message system available");
  3430     }
  3431 
  3432     if (current_window) {
  3433         SDL_RaiseWindow(current_window);
  3434         if (mouse_captured) {
  3435             SDL_CaptureMouse(SDL_TRUE);
  3436         }
  3437     }
  3438 
  3439     SDL_ShowCursor(show_cursor_prev);
  3440     SDL_SetRelativeMouseMode(relative_mode);
  3441 
  3442     return retval;
  3443 }
  3444 
  3445 int
  3446 SDL_ShowSimpleMessageBox(Uint32 flags, const char *title, const char *message, SDL_Window *window)
  3447 {
  3448     SDL_MessageBoxData data;
  3449     SDL_MessageBoxButtonData button;
  3450 
  3451     SDL_zero(data);
  3452     data.flags = flags;
  3453     data.title = title;
  3454     data.message = message;
  3455     data.numbuttons = 1;
  3456     data.buttons = &button;
  3457     data.window = window;
  3458 
  3459     SDL_zero(button);
  3460     button.flags |= SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT;
  3461     button.flags |= SDL_MESSAGEBOX_BUTTON_ESCAPEKEY_DEFAULT;
  3462     button.text = "OK";
  3463 
  3464     return SDL_ShowMessageBox(&data, NULL);
  3465 }
  3466 
  3467 SDL_bool
  3468 SDL_ShouldAllowTopmost(void)
  3469 {
  3470     const char *hint = SDL_GetHint(SDL_HINT_ALLOW_TOPMOST);
  3471     if (hint) {
  3472         if (*hint == '0') {
  3473             return SDL_FALSE;
  3474         } else {
  3475             return SDL_TRUE;
  3476         }
  3477     }
  3478     return SDL_TRUE;
  3479 }
  3480 
  3481 int
  3482 SDL_SetWindowHitTest(SDL_Window * window, SDL_HitTest callback, void *userdata)
  3483 {
  3484     CHECK_WINDOW_MAGIC(window, -1);
  3485 
  3486     if (!_this->SetWindowHitTest) {
  3487         return SDL_Unsupported();
  3488     } else if (_this->SetWindowHitTest(window, callback != NULL) == -1) {
  3489         return -1;
  3490     }
  3491 
  3492     window->hit_test = callback;
  3493     window->hit_test_data = userdata;
  3494 
  3495     return 0;
  3496 }
  3497 
  3498 /* vi: set ts=4 sw=4 expandtab: */