src/video/SDL_video.c
author Ryan C. Gordon <icculus@icculus.org>
Thu, 09 Apr 2015 22:28:37 -0400
changeset 9541 cf8fab52e33b
parent 9537 ff30c198864e
child 9546 d997877cdad7
permissions -rw-r--r--
Merged Alex Szpakowski's iOS-improvement branch to default.

Fixes Bugzilla #2798.
Fixes Bugzilla #2212.
Fixes Bugzilla #2826.
Fixes Bugzilla #2661.
Fixes Bugzilla #1885.
Fixes Bugzilla #1578.
Fixes Bugzilla #2751.

(whew!)

Notable changes, from Alex's notes:

- The SDL_WINDOW_ALLOW_HIGHDPI flag is now needed (along with SDL_GL_GetDrawableSize or SDL_GetRendererOutputSize) to use Retina / high DPI resolutions, bringing SDL’s Retina-related behavior on iOS in line with Mac OS X. Window dimensions and display modes are now in the “points” (non-high DPI) coordinate system rather than pixels, whereas SDL_GL_GetDrawableSize is in pixels.

- Reworked the custom extended launch screen code:
- It now hides after the first SDL_PumpEvents call rather than SDL_CreateWindow, and it fades out in a similar manner to the system launch screen behavior.
- It now mirrors the system launch screen behavior when deciding which image to display: it falls back to using the Launch Images dictionary in Info.plist if the iOS 8+ launch screen nib isn’t available, and if the Launch Images dictionary doesn’t exist it uses the old standard launch image names.
- The extended launch screen can now be disabled via the SDL_IPHONE_LAUNCHSCREEN define in SDL_config_iphoneos.h.

- Added support for SDL_HINT_ACCELEROMETER_AS_JOYSTICK.

- Added access to a window view's renderbuffer and framebuffer to syswm.

- Added OpenGL ES debug labels for the Renderbuffer and Framebuffer Objects created with SDL_GL_CreateContext.

- Added support for sRGB OpenGL ES contexts on iOS 7+.

- Updated OpenGL ES contexts to support native-resolution rendering (when SDL_WINDOW_ALLOW_HIGHDPI is enabled) on the iPhone 6 Plus, i.e. 1080x1920 rather than 1242x2208.

- Updated SDL_GL_CreateContext, SDL_GL_SwapWindow, SDL_GL_MakeCurrent, and SDL_GL_DeleteContext to be more robust.

- Updated SDL windows to display a UIView at all times, even when an OpenGL context is not active. This allows rotation, touch events, and other windowing-related events to work properly without an active OpenGL context. It also makes it easier to use SDL_GetWindowWMInfo after creating a SDL window.

- Updated the iOS-specific Objective-C code to use cleaner and more modern language features and APIs, including ARC instead of manual reference counting.

- Updated SDL_HINT_ORIENTATIONS to allow disabling custom orientations if the hint is set with no valid orientation names.

- Fixed several rotation and orientation bugs with windows and display modes, especially in iOS 8+.

- Fixed SDL_SetWindowFullscreen failing to update the status bar visibility on iOS 7+.

- Fixed the orientation of the offset applied to the window’s view when the onscreen keyboard is shown in iOS 8+.

- Fixed SDL_IsScreenKeyboardShown (patch by Phil Hassey.)

- Fixed several major memory leaks caused by missing autorelease pool blocks in the iOS-specific Objective-C code.

- Removed several dead code paths.

- The iOS 7 SDK (Xcode 5) or newer is now required to build SDL for iOS.
     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     }
  2059 
  2060     if (red) {
  2061         SDL_memcpy(&window->gamma[0*256], red, 256*sizeof(Uint16));
  2062     }
  2063     if (green) {
  2064         SDL_memcpy(&window->gamma[1*256], green, 256*sizeof(Uint16));
  2065     }
  2066     if (blue) {
  2067         SDL_memcpy(&window->gamma[2*256], blue, 256*sizeof(Uint16));
  2068     }
  2069     if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
  2070         return _this->SetWindowGammaRamp(_this, window, window->gamma);
  2071     } else {
  2072         return 0;
  2073     }
  2074 }
  2075 
  2076 int
  2077 SDL_GetWindowGammaRamp(SDL_Window * window, Uint16 * red,
  2078                                             Uint16 * green,
  2079                                             Uint16 * blue)
  2080 {
  2081     CHECK_WINDOW_MAGIC(window, -1);
  2082 
  2083     if (!window->gamma) {
  2084         int i;
  2085 
  2086         window->gamma = (Uint16 *)SDL_malloc(256*6*sizeof(Uint16));
  2087         if (!window->gamma) {
  2088             return SDL_OutOfMemory();
  2089         }
  2090         window->saved_gamma = window->gamma + 3*256;
  2091 
  2092         if (_this->GetWindowGammaRamp) {
  2093             if (_this->GetWindowGammaRamp(_this, window, window->gamma) < 0) {
  2094                 return -1;
  2095             }
  2096         } else {
  2097             /* Create an identity gamma ramp */
  2098             for (i = 0; i < 256; ++i) {
  2099                 Uint16 value = (Uint16)((i << 8) | i);
  2100 
  2101                 window->gamma[0*256+i] = value;
  2102                 window->gamma[1*256+i] = value;
  2103                 window->gamma[2*256+i] = value;
  2104             }
  2105         }
  2106         SDL_memcpy(window->saved_gamma, window->gamma, 3*256*sizeof(Uint16));
  2107     }
  2108 
  2109     if (red) {
  2110         SDL_memcpy(red, &window->gamma[0*256], 256*sizeof(Uint16));
  2111     }
  2112     if (green) {
  2113         SDL_memcpy(green, &window->gamma[1*256], 256*sizeof(Uint16));
  2114     }
  2115     if (blue) {
  2116         SDL_memcpy(blue, &window->gamma[2*256], 256*sizeof(Uint16));
  2117     }
  2118     return 0;
  2119 }
  2120 
  2121 void
  2122 SDL_UpdateWindowGrab(SDL_Window * window)
  2123 {
  2124     if (_this->SetWindowGrab) {
  2125         SDL_Window *grabbed_window;
  2126         SDL_bool grabbed;
  2127         if ((SDL_GetMouse()->relative_mode || (window->flags & SDL_WINDOW_INPUT_GRABBED)) &&
  2128              (window->flags & SDL_WINDOW_INPUT_FOCUS)) {
  2129             grabbed = SDL_TRUE;
  2130         } else {
  2131             grabbed = SDL_FALSE;
  2132         }
  2133 
  2134         grabbed_window = _this->grabbed_window;
  2135         if (grabbed) {
  2136             if (grabbed_window && (grabbed_window != window)) {
  2137                 /* stealing a grab from another window! */
  2138                 grabbed_window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
  2139                 _this->SetWindowGrab(_this, grabbed_window, SDL_FALSE);
  2140             }
  2141             _this->grabbed_window = window;
  2142         } else if (grabbed_window == window) {
  2143             _this->grabbed_window = NULL;  /* ungrabbing. */
  2144         }
  2145 
  2146         _this->SetWindowGrab(_this, window, grabbed);
  2147     }
  2148 }
  2149 
  2150 void
  2151 SDL_SetWindowGrab(SDL_Window * window, SDL_bool grabbed)
  2152 {
  2153     CHECK_WINDOW_MAGIC(window,);
  2154 
  2155     if (!!grabbed == !!(window->flags & SDL_WINDOW_INPUT_GRABBED)) {
  2156         return;
  2157     }
  2158     if (grabbed) {
  2159         window->flags |= SDL_WINDOW_INPUT_GRABBED;
  2160     } else {
  2161         window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
  2162     }
  2163     SDL_UpdateWindowGrab(window);
  2164 }
  2165 
  2166 SDL_bool
  2167 SDL_GetWindowGrab(SDL_Window * window)
  2168 {
  2169     CHECK_WINDOW_MAGIC(window, SDL_FALSE);
  2170     SDL_assert(!_this->grabbed_window || ((_this->grabbed_window->flags & SDL_WINDOW_INPUT_GRABBED) != 0));
  2171     return window == _this->grabbed_window;
  2172 }
  2173 
  2174 SDL_Window *
  2175 SDL_GetGrabbedWindow(void)
  2176 {
  2177     SDL_assert(!_this->grabbed_window || ((_this->grabbed_window->flags & SDL_WINDOW_INPUT_GRABBED) != 0));
  2178     return _this->grabbed_window;
  2179 }
  2180 
  2181 void
  2182 SDL_OnWindowShown(SDL_Window * window)
  2183 {
  2184     SDL_OnWindowRestored(window);
  2185 }
  2186 
  2187 void
  2188 SDL_OnWindowHidden(SDL_Window * window)
  2189 {
  2190     SDL_UpdateFullscreenMode(window, SDL_FALSE);
  2191 }
  2192 
  2193 void
  2194 SDL_OnWindowResized(SDL_Window * window)
  2195 {
  2196     window->surface_valid = SDL_FALSE;
  2197     SDL_SendWindowEvent(window, SDL_WINDOWEVENT_SIZE_CHANGED, window->w, window->h);
  2198 }
  2199 
  2200 void
  2201 SDL_OnWindowMinimized(SDL_Window * window)
  2202 {
  2203     SDL_UpdateFullscreenMode(window, SDL_FALSE);
  2204 }
  2205 
  2206 void
  2207 SDL_OnWindowRestored(SDL_Window * window)
  2208 {
  2209     /*
  2210      * FIXME: Is this fine to just remove this, or should it be preserved just
  2211      * for the fullscreen case? In principle it seems like just hiding/showing
  2212      * windows shouldn't affect the stacking order; maybe the right fix is to
  2213      * re-decouple OnWindowShown and OnWindowRestored.
  2214      */
  2215     /*SDL_RaiseWindow(window);*/
  2216 
  2217     if (FULLSCREEN_VISIBLE(window)) {
  2218         SDL_UpdateFullscreenMode(window, SDL_TRUE);
  2219     }
  2220 }
  2221 
  2222 void
  2223 SDL_OnWindowEnter(SDL_Window * window)
  2224 {
  2225     if (_this->OnWindowEnter) {
  2226         _this->OnWindowEnter(_this, window);
  2227     }
  2228 }
  2229 
  2230 void
  2231 SDL_OnWindowLeave(SDL_Window * window)
  2232 {
  2233 }
  2234 
  2235 void
  2236 SDL_OnWindowFocusGained(SDL_Window * window)
  2237 {
  2238     SDL_Mouse *mouse = SDL_GetMouse();
  2239 
  2240     if (window->gamma && _this->SetWindowGammaRamp) {
  2241         _this->SetWindowGammaRamp(_this, window, window->gamma);
  2242     }
  2243 
  2244     if (mouse && mouse->relative_mode) {
  2245         SDL_SetMouseFocus(window);
  2246         SDL_WarpMouseInWindow(window, window->w/2, window->h/2);
  2247     }
  2248 
  2249     SDL_UpdateWindowGrab(window);
  2250 }
  2251 
  2252 static SDL_bool
  2253 ShouldMinimizeOnFocusLoss(SDL_Window * window)
  2254 {
  2255     const char *hint;
  2256 
  2257     if (!(window->flags & SDL_WINDOW_FULLSCREEN) || window->is_destroying) {
  2258         return SDL_FALSE;
  2259     }
  2260 
  2261 #ifdef __MACOSX__
  2262     if (Cocoa_IsWindowInFullscreenSpace(window)) {
  2263         return SDL_FALSE;
  2264     }
  2265 #endif
  2266 
  2267     hint = SDL_GetHint(SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS);
  2268     if (hint) {
  2269         if (*hint == '0') {
  2270             return SDL_FALSE;
  2271         } else {
  2272             return SDL_TRUE;
  2273         }
  2274     }
  2275 
  2276     return SDL_TRUE;
  2277 }
  2278 
  2279 void
  2280 SDL_OnWindowFocusLost(SDL_Window * window)
  2281 {
  2282     if (window->gamma && _this->SetWindowGammaRamp) {
  2283         _this->SetWindowGammaRamp(_this, window, window->saved_gamma);
  2284     }
  2285 
  2286     SDL_UpdateWindowGrab(window);
  2287 
  2288     if (ShouldMinimizeOnFocusLoss(window)) {
  2289         SDL_MinimizeWindow(window);
  2290     }
  2291 }
  2292 
  2293 /* !!! FIXME: is this different than SDL_GetKeyboardFocus()?
  2294    !!! FIXME:  Also, SDL_GetKeyboardFocus() is O(1), this isn't. */
  2295 SDL_Window *
  2296 SDL_GetFocusWindow(void)
  2297 {
  2298     SDL_Window *window;
  2299 
  2300     if (!_this) {
  2301         return NULL;
  2302     }
  2303     for (window = _this->windows; window; window = window->next) {
  2304         if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
  2305             return window;
  2306         }
  2307     }
  2308     return NULL;
  2309 }
  2310 
  2311 void
  2312 SDL_DestroyWindow(SDL_Window * window)
  2313 {
  2314     SDL_VideoDisplay *display;
  2315 
  2316     CHECK_WINDOW_MAGIC(window,);
  2317 
  2318     window->is_destroying = SDL_TRUE;
  2319 
  2320     /* Restore video mode, etc. */
  2321     SDL_HideWindow(window);
  2322 
  2323     /* Make sure this window no longer has focus */
  2324     if (SDL_GetKeyboardFocus() == window) {
  2325         SDL_SetKeyboardFocus(NULL);
  2326     }
  2327     if (SDL_GetMouseFocus() == window) {
  2328         SDL_SetMouseFocus(NULL);
  2329     }
  2330 
  2331     /* make no context current if this is the current context window. */
  2332     if (window->flags & SDL_WINDOW_OPENGL) {
  2333         if (_this->current_glwin == window) {
  2334             SDL_GL_MakeCurrent(window, NULL);
  2335         }
  2336     }
  2337 
  2338     if (window->surface) {
  2339         window->surface->flags &= ~SDL_DONTFREE;
  2340         SDL_FreeSurface(window->surface);
  2341     }
  2342     if (_this->DestroyWindowFramebuffer) {
  2343         _this->DestroyWindowFramebuffer(_this, window);
  2344     }
  2345     if (_this->DestroyWindow) {
  2346         _this->DestroyWindow(_this, window);
  2347     }
  2348     if (window->flags & SDL_WINDOW_OPENGL) {
  2349         SDL_GL_UnloadLibrary();
  2350     }
  2351 
  2352     display = SDL_GetDisplayForWindow(window);
  2353     if (display->fullscreen_window == window) {
  2354         display->fullscreen_window = NULL;
  2355     }
  2356 
  2357     /* Now invalidate magic */
  2358     window->magic = NULL;
  2359 
  2360     /* Free memory associated with the window */
  2361     SDL_free(window->title);
  2362     SDL_FreeSurface(window->icon);
  2363     SDL_free(window->gamma);
  2364     while (window->data) {
  2365         SDL_WindowUserData *data = window->data;
  2366 
  2367         window->data = data->next;
  2368         SDL_free(data->name);
  2369         SDL_free(data);
  2370     }
  2371 
  2372     /* Unlink the window from the list */
  2373     if (window->next) {
  2374         window->next->prev = window->prev;
  2375     }
  2376     if (window->prev) {
  2377         window->prev->next = window->next;
  2378     } else {
  2379         _this->windows = window->next;
  2380     }
  2381 
  2382     SDL_free(window);
  2383 }
  2384 
  2385 SDL_bool
  2386 SDL_IsScreenSaverEnabled()
  2387 {
  2388     if (!_this) {
  2389         return SDL_TRUE;
  2390     }
  2391     return _this->suspend_screensaver ? SDL_FALSE : SDL_TRUE;
  2392 }
  2393 
  2394 void
  2395 SDL_EnableScreenSaver()
  2396 {
  2397     if (!_this) {
  2398         return;
  2399     }
  2400     if (!_this->suspend_screensaver) {
  2401         return;
  2402     }
  2403     _this->suspend_screensaver = SDL_FALSE;
  2404     if (_this->SuspendScreenSaver) {
  2405         _this->SuspendScreenSaver(_this);
  2406     }
  2407 }
  2408 
  2409 void
  2410 SDL_DisableScreenSaver()
  2411 {
  2412     if (!_this) {
  2413         return;
  2414     }
  2415     if (_this->suspend_screensaver) {
  2416         return;
  2417     }
  2418     _this->suspend_screensaver = SDL_TRUE;
  2419     if (_this->SuspendScreenSaver) {
  2420         _this->SuspendScreenSaver(_this);
  2421     }
  2422 }
  2423 
  2424 void
  2425 SDL_VideoQuit(void)
  2426 {
  2427     int i, j;
  2428 
  2429     if (!_this) {
  2430         return;
  2431     }
  2432 
  2433     /* Halt event processing before doing anything else */
  2434     SDL_TouchQuit();
  2435     SDL_MouseQuit();
  2436     SDL_KeyboardQuit();
  2437     SDL_QuitSubSystem(SDL_INIT_EVENTS);
  2438 
  2439     SDL_EnableScreenSaver();
  2440 
  2441     /* Clean up the system video */
  2442     while (_this->windows) {
  2443         SDL_DestroyWindow(_this->windows);
  2444     }
  2445     _this->VideoQuit(_this);
  2446 
  2447     for (i = 0; i < _this->num_displays; ++i) {
  2448         SDL_VideoDisplay *display = &_this->displays[i];
  2449         for (j = display->num_display_modes; j--;) {
  2450             SDL_free(display->display_modes[j].driverdata);
  2451             display->display_modes[j].driverdata = NULL;
  2452         }
  2453         SDL_free(display->display_modes);
  2454         display->display_modes = NULL;
  2455         SDL_free(display->desktop_mode.driverdata);
  2456         display->desktop_mode.driverdata = NULL;
  2457         SDL_free(display->driverdata);
  2458         display->driverdata = NULL;
  2459     }
  2460     if (_this->displays) {
  2461         for (i = 0; i < _this->num_displays; ++i) {
  2462             SDL_free(_this->displays[i].name);
  2463         }
  2464         SDL_free(_this->displays);
  2465         _this->displays = NULL;
  2466         _this->num_displays = 0;
  2467     }
  2468     SDL_free(_this->clipboard_text);
  2469     _this->clipboard_text = NULL;
  2470     _this->free(_this);
  2471     _this = NULL;
  2472 }
  2473 
  2474 int
  2475 SDL_GL_LoadLibrary(const char *path)
  2476 {
  2477     int retval;
  2478 
  2479     if (!_this) {
  2480         return SDL_UninitializedVideo();
  2481     }
  2482     if (_this->gl_config.driver_loaded) {
  2483         if (path && SDL_strcmp(path, _this->gl_config.driver_path) != 0) {
  2484             return SDL_SetError("OpenGL library already loaded");
  2485         }
  2486         retval = 0;
  2487     } else {
  2488         if (!_this->GL_LoadLibrary) {
  2489             return SDL_SetError("No dynamic GL support in video driver");
  2490         }
  2491         retval = _this->GL_LoadLibrary(_this, path);
  2492     }
  2493     if (retval == 0) {
  2494         ++_this->gl_config.driver_loaded;
  2495     } else {
  2496         if (_this->GL_UnloadLibrary) {
  2497             _this->GL_UnloadLibrary(_this);
  2498         }
  2499     }
  2500     return (retval);
  2501 }
  2502 
  2503 void *
  2504 SDL_GL_GetProcAddress(const char *proc)
  2505 {
  2506     void *func;
  2507 
  2508     if (!_this) {
  2509         SDL_UninitializedVideo();
  2510         return NULL;
  2511     }
  2512     func = NULL;
  2513     if (_this->GL_GetProcAddress) {
  2514         if (_this->gl_config.driver_loaded) {
  2515             func = _this->GL_GetProcAddress(_this, proc);
  2516         } else {
  2517             SDL_SetError("No GL driver has been loaded");
  2518         }
  2519     } else {
  2520         SDL_SetError("No dynamic GL support in video driver");
  2521     }
  2522     return func;
  2523 }
  2524 
  2525 void
  2526 SDL_GL_UnloadLibrary(void)
  2527 {
  2528     if (!_this) {
  2529         SDL_UninitializedVideo();
  2530         return;
  2531     }
  2532     if (_this->gl_config.driver_loaded > 0) {
  2533         if (--_this->gl_config.driver_loaded > 0) {
  2534             return;
  2535         }
  2536         if (_this->GL_UnloadLibrary) {
  2537             _this->GL_UnloadLibrary(_this);
  2538         }
  2539     }
  2540 }
  2541 
  2542 static SDL_INLINE SDL_bool
  2543 isAtLeastGL3(const char *verstr)
  2544 {
  2545     return (verstr && (SDL_atoi(verstr) >= 3));
  2546 }
  2547 
  2548 SDL_bool
  2549 SDL_GL_ExtensionSupported(const char *extension)
  2550 {
  2551 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
  2552     const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
  2553     const char *extensions;
  2554     const char *start;
  2555     const char *where, *terminator;
  2556 
  2557     /* Extension names should not have spaces. */
  2558     where = SDL_strchr(extension, ' ');
  2559     if (where || *extension == '\0') {
  2560         return SDL_FALSE;
  2561     }
  2562     /* See if there's an environment variable override */
  2563     start = SDL_getenv(extension);
  2564     if (start && *start == '0') {
  2565         return SDL_FALSE;
  2566     }
  2567 
  2568     /* Lookup the available extensions */
  2569 
  2570     glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
  2571     if (!glGetStringFunc) {
  2572         return SDL_FALSE;
  2573     }
  2574 
  2575     if (isAtLeastGL3((const char *) glGetStringFunc(GL_VERSION))) {
  2576         const GLubyte *(APIENTRY * glGetStringiFunc) (GLenum, GLuint);
  2577         void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2578         GLint num_exts = 0;
  2579         GLint i;
  2580 
  2581         glGetStringiFunc = SDL_GL_GetProcAddress("glGetStringi");
  2582         glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2583         if ((!glGetStringiFunc) || (!glGetIntegervFunc)) {
  2584             return SDL_FALSE;
  2585         }
  2586 
  2587         #ifndef GL_NUM_EXTENSIONS
  2588         #define GL_NUM_EXTENSIONS 0x821D
  2589         #endif
  2590         glGetIntegervFunc(GL_NUM_EXTENSIONS, &num_exts);
  2591         for (i = 0; i < num_exts; i++) {
  2592             const char *thisext = (const char *) glGetStringiFunc(GL_EXTENSIONS, i);
  2593             if (SDL_strcmp(thisext, extension) == 0) {
  2594                 return SDL_TRUE;
  2595             }
  2596         }
  2597 
  2598         return SDL_FALSE;
  2599     }
  2600 
  2601     /* Try the old way with glGetString(GL_EXTENSIONS) ... */
  2602 
  2603     extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
  2604     if (!extensions) {
  2605         return SDL_FALSE;
  2606     }
  2607     /*
  2608      * It takes a bit of care to be fool-proof about parsing the OpenGL
  2609      * extensions string. Don't be fooled by sub-strings, etc.
  2610      */
  2611 
  2612     start = extensions;
  2613 
  2614     for (;;) {
  2615         where = SDL_strstr(start, extension);
  2616         if (!where)
  2617             break;
  2618 
  2619         terminator = where + SDL_strlen(extension);
  2620         if (where == start || *(where - 1) == ' ')
  2621             if (*terminator == ' ' || *terminator == '\0')
  2622                 return SDL_TRUE;
  2623 
  2624         start = terminator;
  2625     }
  2626     return SDL_FALSE;
  2627 #else
  2628     return SDL_FALSE;
  2629 #endif
  2630 }
  2631 
  2632 void
  2633 SDL_GL_ResetAttributes()
  2634 {
  2635     if (!_this) {
  2636         return;
  2637     }
  2638 
  2639     _this->gl_config.red_size = 3;
  2640     _this->gl_config.green_size = 3;
  2641     _this->gl_config.blue_size = 2;
  2642     _this->gl_config.alpha_size = 0;
  2643     _this->gl_config.buffer_size = 0;
  2644     _this->gl_config.depth_size = 16;
  2645     _this->gl_config.stencil_size = 0;
  2646     _this->gl_config.double_buffer = 1;
  2647     _this->gl_config.accum_red_size = 0;
  2648     _this->gl_config.accum_green_size = 0;
  2649     _this->gl_config.accum_blue_size = 0;
  2650     _this->gl_config.accum_alpha_size = 0;
  2651     _this->gl_config.stereo = 0;
  2652     _this->gl_config.multisamplebuffers = 0;
  2653     _this->gl_config.multisamplesamples = 0;
  2654     _this->gl_config.retained_backing = 1;
  2655     _this->gl_config.accelerated = -1;  /* accelerated or not, both are fine */
  2656     _this->gl_config.profile_mask = 0;
  2657 #if SDL_VIDEO_OPENGL
  2658     _this->gl_config.major_version = 2;
  2659     _this->gl_config.minor_version = 1;
  2660 #elif SDL_VIDEO_OPENGL_ES2
  2661     _this->gl_config.major_version = 2;
  2662     _this->gl_config.minor_version = 0;
  2663     _this->gl_config.profile_mask = SDL_GL_CONTEXT_PROFILE_ES;
  2664 #elif SDL_VIDEO_OPENGL_ES
  2665     _this->gl_config.major_version = 1;
  2666     _this->gl_config.minor_version = 1;
  2667     _this->gl_config.profile_mask = SDL_GL_CONTEXT_PROFILE_ES;
  2668 #endif
  2669     _this->gl_config.flags = 0;
  2670     _this->gl_config.framebuffer_srgb_capable = 0;
  2671     _this->gl_config.release_behavior = SDL_GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH;
  2672 
  2673     _this->gl_config.share_with_current_context = 0;
  2674 }
  2675 
  2676 int
  2677 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
  2678 {
  2679 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
  2680     int retval;
  2681 
  2682     if (!_this) {
  2683         return SDL_UninitializedVideo();
  2684     }
  2685     retval = 0;
  2686     switch (attr) {
  2687     case SDL_GL_RED_SIZE:
  2688         _this->gl_config.red_size = value;
  2689         break;
  2690     case SDL_GL_GREEN_SIZE:
  2691         _this->gl_config.green_size = value;
  2692         break;
  2693     case SDL_GL_BLUE_SIZE:
  2694         _this->gl_config.blue_size = value;
  2695         break;
  2696     case SDL_GL_ALPHA_SIZE:
  2697         _this->gl_config.alpha_size = value;
  2698         break;
  2699     case SDL_GL_DOUBLEBUFFER:
  2700         _this->gl_config.double_buffer = value;
  2701         break;
  2702     case SDL_GL_BUFFER_SIZE:
  2703         _this->gl_config.buffer_size = value;
  2704         break;
  2705     case SDL_GL_DEPTH_SIZE:
  2706         _this->gl_config.depth_size = value;
  2707         break;
  2708     case SDL_GL_STENCIL_SIZE:
  2709         _this->gl_config.stencil_size = value;
  2710         break;
  2711     case SDL_GL_ACCUM_RED_SIZE:
  2712         _this->gl_config.accum_red_size = value;
  2713         break;
  2714     case SDL_GL_ACCUM_GREEN_SIZE:
  2715         _this->gl_config.accum_green_size = value;
  2716         break;
  2717     case SDL_GL_ACCUM_BLUE_SIZE:
  2718         _this->gl_config.accum_blue_size = value;
  2719         break;
  2720     case SDL_GL_ACCUM_ALPHA_SIZE:
  2721         _this->gl_config.accum_alpha_size = value;
  2722         break;
  2723     case SDL_GL_STEREO:
  2724         _this->gl_config.stereo = value;
  2725         break;
  2726     case SDL_GL_MULTISAMPLEBUFFERS:
  2727         _this->gl_config.multisamplebuffers = value;
  2728         break;
  2729     case SDL_GL_MULTISAMPLESAMPLES:
  2730         _this->gl_config.multisamplesamples = value;
  2731         break;
  2732     case SDL_GL_ACCELERATED_VISUAL:
  2733         _this->gl_config.accelerated = value;
  2734         break;
  2735     case SDL_GL_RETAINED_BACKING:
  2736         _this->gl_config.retained_backing = value;
  2737         break;
  2738     case SDL_GL_CONTEXT_MAJOR_VERSION:
  2739         _this->gl_config.major_version = value;
  2740         break;
  2741     case SDL_GL_CONTEXT_MINOR_VERSION:
  2742         _this->gl_config.minor_version = value;
  2743         break;
  2744     case SDL_GL_CONTEXT_EGL:
  2745         /* FIXME: SDL_GL_CONTEXT_EGL to be deprecated in SDL 2.1 */
  2746         if (value != 0) {
  2747             SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
  2748         } else {
  2749             SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, 0);
  2750         };
  2751         break;
  2752     case SDL_GL_CONTEXT_FLAGS:
  2753         if (value & ~(SDL_GL_CONTEXT_DEBUG_FLAG |
  2754                       SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG |
  2755                       SDL_GL_CONTEXT_ROBUST_ACCESS_FLAG |
  2756                       SDL_GL_CONTEXT_RESET_ISOLATION_FLAG)) {
  2757             retval = SDL_SetError("Unknown OpenGL context flag %d", value);
  2758             break;
  2759         }
  2760         _this->gl_config.flags = value;
  2761         break;
  2762     case SDL_GL_CONTEXT_PROFILE_MASK:
  2763         if (value != 0 &&
  2764             value != SDL_GL_CONTEXT_PROFILE_CORE &&
  2765             value != SDL_GL_CONTEXT_PROFILE_COMPATIBILITY &&
  2766             value != SDL_GL_CONTEXT_PROFILE_ES) {
  2767             retval = SDL_SetError("Unknown OpenGL context profile %d", value);
  2768             break;
  2769         }
  2770         _this->gl_config.profile_mask = value;
  2771         break;
  2772     case SDL_GL_SHARE_WITH_CURRENT_CONTEXT:
  2773         _this->gl_config.share_with_current_context = value;
  2774         break;
  2775     case SDL_GL_FRAMEBUFFER_SRGB_CAPABLE:
  2776         _this->gl_config.framebuffer_srgb_capable = value;
  2777         break;
  2778     case SDL_GL_CONTEXT_RELEASE_BEHAVIOR:
  2779         _this->gl_config.release_behavior = value;
  2780         break;
  2781     default:
  2782         retval = SDL_SetError("Unknown OpenGL attribute");
  2783         break;
  2784     }
  2785     return retval;
  2786 #else
  2787     return SDL_Unsupported();
  2788 #endif /* SDL_VIDEO_OPENGL */
  2789 }
  2790 
  2791 int
  2792 SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
  2793 {
  2794 #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
  2795     void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
  2796     GLenum(APIENTRY * glGetErrorFunc) (void);
  2797     GLenum attrib = 0;
  2798     GLenum error = 0;
  2799 
  2800     glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
  2801     if (!glGetIntegervFunc) {
  2802         return -1;
  2803     }
  2804 
  2805     glGetErrorFunc = SDL_GL_GetProcAddress("glGetError");
  2806     if (!glGetErrorFunc) {
  2807         return -1;
  2808     }
  2809 
  2810     /* Clear value in any case */
  2811     *value = 0;
  2812 
  2813     switch (attr) {
  2814     case SDL_GL_RED_SIZE:
  2815         attrib = GL_RED_BITS;
  2816         break;
  2817     case SDL_GL_BLUE_SIZE:
  2818         attrib = GL_BLUE_BITS;
  2819         break;
  2820     case SDL_GL_GREEN_SIZE:
  2821         attrib = GL_GREEN_BITS;
  2822         break;
  2823     case SDL_GL_ALPHA_SIZE:
  2824         attrib = GL_ALPHA_BITS;
  2825         break;
  2826     case SDL_GL_DOUBLEBUFFER:
  2827 #if SDL_VIDEO_OPENGL
  2828         attrib = GL_DOUBLEBUFFER;
  2829         break;
  2830 #else
  2831         /* OpenGL ES 1.0 and above specifications have EGL_SINGLE_BUFFER      */
  2832         /* parameter which switches double buffer to single buffer. OpenGL ES */
  2833         /* SDL driver must set proper value after initialization              */
  2834         *value = _this->gl_config.double_buffer;
  2835         return 0;
  2836 #endif
  2837     case SDL_GL_DEPTH_SIZE:
  2838         attrib = GL_DEPTH_BITS;
  2839         break;
  2840     case SDL_GL_STENCIL_SIZE:
  2841         attrib = GL_STENCIL_BITS;
  2842         break;
  2843 #if SDL_VIDEO_OPENGL
  2844     case SDL_GL_ACCUM_RED_SIZE:
  2845         attrib = GL_ACCUM_RED_BITS;
  2846         break;
  2847     case SDL_GL_ACCUM_GREEN_SIZE:
  2848         attrib = GL_ACCUM_GREEN_BITS;
  2849         break;
  2850     case SDL_GL_ACCUM_BLUE_SIZE:
  2851         attrib = GL_ACCUM_BLUE_BITS;
  2852         break;
  2853     case SDL_GL_ACCUM_ALPHA_SIZE:
  2854         attrib = GL_ACCUM_ALPHA_BITS;
  2855         break;
  2856     case SDL_GL_STEREO:
  2857         attrib = GL_STEREO;
  2858         break;
  2859 #else
  2860     case SDL_GL_ACCUM_RED_SIZE:
  2861     case SDL_GL_ACCUM_GREEN_SIZE:
  2862     case SDL_GL_ACCUM_BLUE_SIZE:
  2863     case SDL_GL_ACCUM_ALPHA_SIZE:
  2864     case SDL_GL_STEREO:
  2865         /* none of these are supported in OpenGL ES */
  2866         *value = 0;
  2867         return 0;
  2868 #endif
  2869     case SDL_GL_MULTISAMPLEBUFFERS:
  2870 #if SDL_VIDEO_OPENGL
  2871         attrib = GL_SAMPLE_BUFFERS_ARB;
  2872 #else
  2873         attrib = GL_SAMPLE_BUFFERS;
  2874 #endif
  2875         break;
  2876     case SDL_GL_MULTISAMPLESAMPLES:
  2877 #if SDL_VIDEO_OPENGL
  2878         attrib = GL_SAMPLES_ARB;
  2879 #else
  2880         attrib = GL_SAMPLES;
  2881 #endif
  2882         break;
  2883     case SDL_GL_CONTEXT_RELEASE_BEHAVIOR:
  2884 #if SDL_VIDEO_OPENGL
  2885         attrib = GL_CONTEXT_RELEASE_BEHAVIOR;
  2886 #else
  2887         attrib = GL_CONTEXT_RELEASE_BEHAVIOR_KHR;
  2888 #endif
  2889         break;
  2890     case SDL_GL_BUFFER_SIZE:
  2891         {
  2892             GLint bits = 0;
  2893             GLint component;
  2894 
  2895             /*
  2896              * there doesn't seem to be a single flag in OpenGL
  2897              * for this!
  2898              */
  2899             glGetIntegervFunc(GL_RED_BITS, &component);
  2900             bits += component;
  2901             glGetIntegervFunc(GL_GREEN_BITS, &component);
  2902             bits += component;
  2903             glGetIntegervFunc(GL_BLUE_BITS, &component);
  2904             bits += component;
  2905             glGetIntegervFunc(GL_ALPHA_BITS, &component);
  2906             bits += component;
  2907 
  2908             *value = bits;
  2909             return 0;
  2910         }
  2911     case SDL_GL_ACCELERATED_VISUAL:
  2912         {
  2913             /* FIXME: How do we get this information? */
  2914             *value = (_this->gl_config.accelerated != 0);
  2915             return 0;
  2916         }
  2917     case SDL_GL_RETAINED_BACKING:
  2918         {
  2919             *value = _this->gl_config.retained_backing;
  2920             return 0;
  2921         }
  2922     case SDL_GL_CONTEXT_MAJOR_VERSION:
  2923         {
  2924             *value = _this->gl_config.major_version;
  2925             return 0;
  2926         }
  2927     case SDL_GL_CONTEXT_MINOR_VERSION:
  2928         {
  2929             *value = _this->gl_config.minor_version;
  2930             return 0;
  2931         }
  2932     case SDL_GL_CONTEXT_EGL:
  2933         /* FIXME: SDL_GL_CONTEXT_EGL to be deprecated in SDL 2.1 */
  2934         {
  2935             if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {
  2936                 *value = 1;
  2937             }
  2938             else {
  2939                 *value = 0;
  2940             }
  2941             return 0;
  2942         }
  2943     case SDL_GL_CONTEXT_FLAGS:
  2944         {
  2945             *value = _this->gl_config.flags;
  2946             return 0;
  2947         }
  2948     case SDL_GL_CONTEXT_PROFILE_MASK:
  2949         {
  2950             *value = _this->gl_config.profile_mask;
  2951             return 0;
  2952         }
  2953     case SDL_GL_SHARE_WITH_CURRENT_CONTEXT:
  2954         {
  2955             *value = _this->gl_config.share_with_current_context;
  2956             return 0;
  2957         }
  2958     case SDL_GL_FRAMEBUFFER_SRGB_CAPABLE:
  2959         {
  2960             *value = _this->gl_config.framebuffer_srgb_capable;
  2961             return 0;
  2962         }
  2963     default:
  2964         return SDL_SetError("Unknown OpenGL attribute");
  2965     }
  2966 
  2967     glGetIntegervFunc(attrib, (GLint *) value);
  2968     error = glGetErrorFunc();
  2969     if (error != GL_NO_ERROR) {
  2970         if (error == GL_INVALID_ENUM) {
  2971             return SDL_SetError("OpenGL error: GL_INVALID_ENUM");
  2972         } else if (error == GL_INVALID_VALUE) {
  2973             return SDL_SetError("OpenGL error: GL_INVALID_VALUE");
  2974         }
  2975         return SDL_SetError("OpenGL error: %08X", error);
  2976     }
  2977     return 0;
  2978 #else
  2979     return SDL_Unsupported();
  2980 #endif /* SDL_VIDEO_OPENGL */
  2981 }
  2982 
  2983 SDL_GLContext
  2984 SDL_GL_CreateContext(SDL_Window * window)
  2985 {
  2986     SDL_GLContext ctx = NULL;
  2987     CHECK_WINDOW_MAGIC(window, NULL);
  2988 
  2989     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  2990         SDL_SetError("The specified window isn't an OpenGL window");
  2991         return NULL;
  2992     }
  2993 
  2994     ctx = _this->GL_CreateContext(_this, window);
  2995 
  2996     /* Creating a context is assumed to make it current in the SDL driver. */
  2997     if (ctx) {
  2998         _this->current_glwin = window;
  2999         _this->current_glctx = ctx;
  3000         SDL_TLSSet(_this->current_glwin_tls, window, NULL);
  3001         SDL_TLSSet(_this->current_glctx_tls, ctx, NULL);
  3002     }
  3003     return ctx;
  3004 }
  3005 
  3006 int
  3007 SDL_GL_MakeCurrent(SDL_Window * window, SDL_GLContext ctx)
  3008 {
  3009     int retval;
  3010 
  3011     if (window == SDL_GL_GetCurrentWindow() &&
  3012         ctx == SDL_GL_GetCurrentContext()) {
  3013         /* We're already current. */
  3014         return 0;
  3015     }
  3016 
  3017     if (!ctx) {
  3018         window = NULL;
  3019     } else {
  3020         CHECK_WINDOW_MAGIC(window, -1);
  3021 
  3022         if (!(window->flags & SDL_WINDOW_OPENGL)) {
  3023             return SDL_SetError("The specified window isn't an OpenGL window");
  3024         }
  3025     }
  3026 
  3027     retval = _this->GL_MakeCurrent(_this, window, ctx);
  3028     if (retval == 0) {
  3029         _this->current_glwin = window;
  3030         _this->current_glctx = ctx;
  3031         SDL_TLSSet(_this->current_glwin_tls, window, NULL);
  3032         SDL_TLSSet(_this->current_glctx_tls, ctx, NULL);
  3033     }
  3034     return retval;
  3035 }
  3036 
  3037 SDL_Window *
  3038 SDL_GL_GetCurrentWindow(void)
  3039 {
  3040     if (!_this) {
  3041         SDL_UninitializedVideo();
  3042         return NULL;
  3043     }
  3044     return (SDL_Window *)SDL_TLSGet(_this->current_glwin_tls);
  3045 }
  3046 
  3047 SDL_GLContext
  3048 SDL_GL_GetCurrentContext(void)
  3049 {
  3050     if (!_this) {
  3051         SDL_UninitializedVideo();
  3052         return NULL;
  3053     }
  3054     return (SDL_GLContext)SDL_TLSGet(_this->current_glctx_tls);
  3055 }
  3056 
  3057 void SDL_GL_GetDrawableSize(SDL_Window * window, int *w, int *h)
  3058 {
  3059     CHECK_WINDOW_MAGIC(window,);
  3060 
  3061     if (_this->GL_GetDrawableSize) {
  3062         _this->GL_GetDrawableSize(_this, window, w, h);
  3063     } else {
  3064         SDL_GetWindowSize(window, w, h);
  3065     }
  3066 }
  3067 
  3068 int
  3069 SDL_GL_SetSwapInterval(int interval)
  3070 {
  3071     if (!_this) {
  3072         return SDL_UninitializedVideo();
  3073     } else if (SDL_GL_GetCurrentContext() == NULL) {
  3074         return SDL_SetError("No OpenGL context has been made current");
  3075     } else if (_this->GL_SetSwapInterval) {
  3076         return _this->GL_SetSwapInterval(_this, interval);
  3077     } else {
  3078         return SDL_SetError("Setting the swap interval is not supported");
  3079     }
  3080 }
  3081 
  3082 int
  3083 SDL_GL_GetSwapInterval(void)
  3084 {
  3085     if (!_this) {
  3086         return 0;
  3087     } else if (SDL_GL_GetCurrentContext() == NULL) {
  3088         return 0;
  3089     } else if (_this->GL_GetSwapInterval) {
  3090         return _this->GL_GetSwapInterval(_this);
  3091     } else {
  3092         return 0;
  3093     }
  3094 }
  3095 
  3096 void
  3097 SDL_GL_SwapWindow(SDL_Window * window)
  3098 {
  3099     CHECK_WINDOW_MAGIC(window,);
  3100 
  3101     if (!(window->flags & SDL_WINDOW_OPENGL)) {
  3102         SDL_SetError("The specified window isn't an OpenGL window");
  3103         return;
  3104     }
  3105 
  3106     if (SDL_GL_GetCurrentWindow() != window) {
  3107         SDL_SetError("The specified window has not been made current");
  3108         return;
  3109     }
  3110 
  3111     _this->GL_SwapWindow(_this, window);
  3112 }
  3113 
  3114 void
  3115 SDL_GL_DeleteContext(SDL_GLContext context)
  3116 {
  3117     if (!_this || !context) {
  3118         return;
  3119     }
  3120 
  3121     if (SDL_GL_GetCurrentContext() == context) {
  3122         SDL_GL_MakeCurrent(NULL, NULL);
  3123     }
  3124 
  3125     _this->GL_DeleteContext(_this, context);
  3126 }
  3127 
  3128 #if 0                           /* FIXME */
  3129 /*
  3130  * Utility function used by SDL_WM_SetIcon(); flags & 1 for color key, flags
  3131  * & 2 for alpha channel.
  3132  */
  3133 static void
  3134 CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
  3135 {
  3136     int x, y;
  3137     Uint32 colorkey;
  3138 #define SET_MASKBIT(icon, x, y, mask) \
  3139     mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  3140 
  3141     colorkey = icon->format->colorkey;
  3142     switch (icon->format->BytesPerPixel) {
  3143     case 1:
  3144         {
  3145             Uint8 *pixels;
  3146             for (y = 0; y < icon->h; ++y) {
  3147                 pixels = (Uint8 *) icon->pixels + y * icon->pitch;
  3148                 for (x = 0; x < icon->w; ++x) {
  3149                     if (*pixels++ == colorkey) {
  3150                         SET_MASKBIT(icon, x, y, mask);
  3151                     }
  3152                 }
  3153             }
  3154         }
  3155         break;
  3156 
  3157     case 2:
  3158         {
  3159             Uint16 *pixels;
  3160             for (y = 0; y < icon->h; ++y) {
  3161                 pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
  3162                 for (x = 0; x < icon->w; ++x) {
  3163                     if ((flags & 1) && *pixels == colorkey) {
  3164                         SET_MASKBIT(icon, x, y, mask);
  3165                     } else if ((flags & 2)
  3166                                && (*pixels & icon->format->Amask) == 0) {
  3167                         SET_MASKBIT(icon, x, y, mask);
  3168                     }
  3169                     pixels++;
  3170                 }
  3171             }
  3172         }
  3173         break;
  3174 
  3175     case 4:
  3176         {
  3177             Uint32 *pixels;
  3178             for (y = 0; y < icon->h; ++y) {
  3179                 pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
  3180                 for (x = 0; x < icon->w; ++x) {
  3181                     if ((flags & 1) && *pixels == colorkey) {
  3182                         SET_MASKBIT(icon, x, y, mask);
  3183                     } else if ((flags & 2)
  3184                                && (*pixels & icon->format->Amask) == 0) {
  3185                         SET_MASKBIT(icon, x, y, mask);
  3186                     }
  3187                     pixels++;
  3188                 }
  3189             }
  3190         }
  3191         break;
  3192     }
  3193 }
  3194 
  3195 /*
  3196  * Sets the window manager icon for the display window.
  3197  */
  3198 void
  3199 SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
  3200 {
  3201     if (icon && _this->SetIcon) {
  3202         /* Generate a mask if necessary, and create the icon! */
  3203         if (mask == NULL) {
  3204             int mask_len = icon->h * (icon->w + 7) / 8;
  3205             int flags = 0;
  3206             mask = (Uint8 *) SDL_malloc(mask_len);
  3207             if (mask == NULL) {
  3208                 return;
  3209             }
  3210             SDL_memset(mask, ~0, mask_len);
  3211             if (icon->flags & SDL_SRCCOLORKEY)
  3212                 flags |= 1;
  3213             if (icon->flags & SDL_SRCALPHA)
  3214                 flags |= 2;
  3215             if (flags) {
  3216                 CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  3217             }
  3218             _this->SetIcon(_this, icon, mask);
  3219             SDL_free(mask);
  3220         } else {
  3221             _this->SetIcon(_this, icon, mask);
  3222         }
  3223     }
  3224 }
  3225 #endif
  3226 
  3227 SDL_bool
  3228 SDL_GetWindowWMInfo(SDL_Window * window, struct SDL_SysWMinfo *info)
  3229 {
  3230     CHECK_WINDOW_MAGIC(window, SDL_FALSE);
  3231 
  3232     if (!info) {
  3233         SDL_InvalidParamError("info");
  3234         return SDL_FALSE;
  3235     }
  3236     info->subsystem = SDL_SYSWM_UNKNOWN;
  3237 
  3238     if (!_this->GetWindowWMInfo) {
  3239         SDL_Unsupported();
  3240         return SDL_FALSE;
  3241     }
  3242     return (_this->GetWindowWMInfo(_this, window, info));
  3243 }
  3244 
  3245 void
  3246 SDL_StartTextInput(void)
  3247 {
  3248     SDL_Window *window;
  3249 
  3250     /* First, enable text events */
  3251     SDL_EventState(SDL_TEXTINPUT, SDL_ENABLE);
  3252     SDL_EventState(SDL_TEXTEDITING, SDL_ENABLE);
  3253 
  3254     /* Then show the on-screen keyboard, if any */
  3255     window = SDL_GetFocusWindow();
  3256     if (window && _this && _this->ShowScreenKeyboard) {
  3257         _this->ShowScreenKeyboard(_this, window);
  3258     }
  3259 
  3260     /* Finally start the text input system */
  3261     if (_this && _this->StartTextInput) {
  3262         _this->StartTextInput(_this);
  3263     }
  3264 }
  3265 
  3266 SDL_bool
  3267 SDL_IsTextInputActive(void)
  3268 {
  3269     return (SDL_GetEventState(SDL_TEXTINPUT) == SDL_ENABLE);
  3270 }
  3271 
  3272 void
  3273 SDL_StopTextInput(void)
  3274 {
  3275     SDL_Window *window;
  3276 
  3277     /* Stop the text input system */
  3278     if (_this && _this->StopTextInput) {
  3279         _this->StopTextInput(_this);
  3280     }
  3281 
  3282     /* Hide the on-screen keyboard, if any */
  3283     window = SDL_GetFocusWindow();
  3284     if (window && _this && _this->HideScreenKeyboard) {
  3285         _this->HideScreenKeyboard(_this, window);
  3286     }
  3287 
  3288     /* Finally disable text events */
  3289     SDL_EventState(SDL_TEXTINPUT, SDL_DISABLE);
  3290     SDL_EventState(SDL_TEXTEDITING, SDL_DISABLE);
  3291 }
  3292 
  3293 void
  3294 SDL_SetTextInputRect(SDL_Rect *rect)
  3295 {
  3296     if (_this && _this->SetTextInputRect) {
  3297         _this->SetTextInputRect(_this, rect);
  3298     }
  3299 }
  3300 
  3301 SDL_bool
  3302 SDL_HasScreenKeyboardSupport(void)
  3303 {
  3304     if (_this && _this->HasScreenKeyboardSupport) {
  3305         return _this->HasScreenKeyboardSupport(_this);
  3306     }
  3307     return SDL_FALSE;
  3308 }
  3309 
  3310 SDL_bool
  3311 SDL_IsScreenKeyboardShown(SDL_Window *window)
  3312 {
  3313     if (window && _this && _this->IsScreenKeyboardShown) {
  3314         return _this->IsScreenKeyboardShown(_this, window);
  3315     }
  3316     return SDL_FALSE;
  3317 }
  3318 
  3319 #if SDL_VIDEO_DRIVER_ANDROID
  3320 #include "android/SDL_androidmessagebox.h"
  3321 #endif
  3322 #if SDL_VIDEO_DRIVER_WINDOWS
  3323 #include "windows/SDL_windowsmessagebox.h"
  3324 #endif
  3325 #if SDL_VIDEO_DRIVER_WINRT
  3326 #include "winrt/SDL_winrtmessagebox.h"
  3327 #endif
  3328 #if SDL_VIDEO_DRIVER_COCOA
  3329 #include "cocoa/SDL_cocoamessagebox.h"
  3330 #endif
  3331 #if SDL_VIDEO_DRIVER_UIKIT
  3332 #include "uikit/SDL_uikitmessagebox.h"
  3333 #endif
  3334 #if SDL_VIDEO_DRIVER_X11
  3335 #include "x11/SDL_x11messagebox.h"
  3336 #endif
  3337 
  3338 // This function will be unused if none of the above video drivers are present.
  3339 SDL_UNUSED static SDL_bool SDL_MessageboxValidForDriver(const SDL_MessageBoxData *messageboxdata, SDL_SYSWM_TYPE drivertype)
  3340 {
  3341     SDL_SysWMinfo info;
  3342     SDL_Window *window = messageboxdata->window;
  3343 
  3344     if (!window) {
  3345         return SDL_TRUE;
  3346     }
  3347 
  3348     SDL_VERSION(&info.version);
  3349     if (!SDL_GetWindowWMInfo(window, &info)) {
  3350         return SDL_TRUE;
  3351     } else {
  3352         return (info.subsystem == drivertype);
  3353     }
  3354 }
  3355 
  3356 int
  3357 SDL_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
  3358 {
  3359     int dummybutton;
  3360     int retval = -1;
  3361     SDL_bool relative_mode;
  3362     int show_cursor_prev;
  3363     SDL_bool mouse_captured;
  3364     SDL_Window *current_window;
  3365 
  3366     if (!messageboxdata) {
  3367         return SDL_InvalidParamError("messageboxdata");
  3368     }
  3369 
  3370     current_window = SDL_GetKeyboardFocus();
  3371     mouse_captured = current_window && ((SDL_GetWindowFlags(current_window) & SDL_WINDOW_MOUSE_CAPTURE) != 0);
  3372     relative_mode = SDL_GetRelativeMouseMode();
  3373     SDL_CaptureMouse(SDL_FALSE);
  3374     SDL_SetRelativeMouseMode(SDL_FALSE);
  3375     show_cursor_prev = SDL_ShowCursor(1);
  3376 
  3377     if (!buttonid) {
  3378         buttonid = &dummybutton;
  3379     }
  3380 
  3381     if (_this && _this->ShowMessageBox) {
  3382         retval = _this->ShowMessageBox(_this, messageboxdata, buttonid);
  3383     }
  3384 
  3385     /* It's completely fine to call this function before video is initialized */
  3386 #if SDL_VIDEO_DRIVER_ANDROID
  3387     if (retval == -1 &&
  3388         Android_ShowMessageBox(messageboxdata, buttonid) == 0) {
  3389         retval = 0;
  3390     }
  3391 #endif
  3392 #if SDL_VIDEO_DRIVER_WINDOWS
  3393     if (retval == -1 &&
  3394         SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_WINDOWS) &&
  3395         WIN_ShowMessageBox(messageboxdata, buttonid) == 0) {
  3396         retval = 0;
  3397     }
  3398 #endif
  3399 #if SDL_VIDEO_DRIVER_WINRT
  3400     if (retval == -1 &&
  3401         SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_WINRT) &&
  3402         WINRT_ShowMessageBox(messageboxdata, buttonid) == 0) {
  3403         retval = 0;
  3404     }
  3405 #endif
  3406 #if SDL_VIDEO_DRIVER_COCOA
  3407     if (retval == -1 &&
  3408         SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_COCOA) &&
  3409         Cocoa_ShowMessageBox(messageboxdata, buttonid) == 0) {
  3410         retval = 0;
  3411     }
  3412 #endif
  3413 #if SDL_VIDEO_DRIVER_UIKIT
  3414     if (retval == -1 &&
  3415         SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_UIKIT) &&
  3416         UIKit_ShowMessageBox(messageboxdata, buttonid) == 0) {
  3417         retval = 0;
  3418     }
  3419 #endif
  3420 #if SDL_VIDEO_DRIVER_X11
  3421     if (retval == -1 &&
  3422         SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_X11) &&
  3423         X11_ShowMessageBox(messageboxdata, buttonid) == 0) {
  3424         retval = 0;
  3425     }
  3426 #endif
  3427     if (retval == -1) {
  3428         SDL_SetError("No message system available");
  3429     }
  3430 
  3431     if (current_window) {
  3432         SDL_RaiseWindow(current_window);
  3433         if (mouse_captured) {
  3434             SDL_CaptureMouse(SDL_TRUE);
  3435         }
  3436     }
  3437 
  3438     SDL_ShowCursor(show_cursor_prev);
  3439     SDL_SetRelativeMouseMode(relative_mode);
  3440 
  3441     return retval;
  3442 }
  3443 
  3444 int
  3445 SDL_ShowSimpleMessageBox(Uint32 flags, const char *title, const char *message, SDL_Window *window)
  3446 {
  3447     SDL_MessageBoxData data;
  3448     SDL_MessageBoxButtonData button;
  3449 
  3450     SDL_zero(data);
  3451     data.flags = flags;
  3452     data.title = title;
  3453     data.message = message;
  3454     data.numbuttons = 1;
  3455     data.buttons = &button;
  3456     data.window = window;
  3457 
  3458     SDL_zero(button);
  3459     button.flags |= SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT;
  3460     button.flags |= SDL_MESSAGEBOX_BUTTON_ESCAPEKEY_DEFAULT;
  3461     button.text = "OK";
  3462 
  3463     return SDL_ShowMessageBox(&data, NULL);
  3464 }
  3465 
  3466 SDL_bool
  3467 SDL_ShouldAllowTopmost(void)
  3468 {
  3469     const char *hint = SDL_GetHint(SDL_HINT_ALLOW_TOPMOST);
  3470     if (hint) {
  3471         if (*hint == '0') {
  3472             return SDL_FALSE;
  3473         } else {
  3474             return SDL_TRUE;
  3475         }
  3476     }
  3477     return SDL_TRUE;
  3478 }
  3479 
  3480 int
  3481 SDL_SetWindowHitTest(SDL_Window * window, SDL_HitTest callback, void *userdata)
  3482 {
  3483     CHECK_WINDOW_MAGIC(window, -1);
  3484 
  3485     if (!_this->SetWindowHitTest) {
  3486         return SDL_Unsupported();
  3487     } else if (_this->SetWindowHitTest(window, callback != NULL) == -1) {
  3488         return -1;
  3489     }
  3490 
  3491     window->hit_test = callback;
  3492     window->hit_test_data = userdata;
  3493 
  3494     return 0;
  3495 }
  3496 
  3497 /* vi: set ts=4 sw=4 expandtab: */