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src/video/SDL_egl.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 04 Oct 2016 03:38:39 -0700
changeset 10461 520440de7a17
parent 10169 e8062c7fa8b8
child 10693 8ba9886003b1
permissions -rw-r--r--
Fixed compiler warning - this should have been a const char pointer 
     1 /*

     2  *  Simple DirectMedia Layer

     3  *  Copyright (C) 1997-2016 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 #if SDL_VIDEO_OPENGL_EGL

    24 

    25 #if SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT

    26 #include "../core/windows/SDL_windows.h"

    27 #endif

    28 

    29 #include "SDL_sysvideo.h"

    30 #include "SDL_egl_c.h"

    31 #include "SDL_loadso.h"

    32 #include "SDL_hints.h"

    33 

    34 #ifdef EGL_KHR_create_context

    35 /* EGL_OPENGL_ES3_BIT_KHR was added in version 13 of the extension. */

    36 #ifndef EGL_OPENGL_ES3_BIT_KHR

    37 #define EGL_OPENGL_ES3_BIT_KHR 0x00000040

    38 #endif

    39 #endif /* EGL_KHR_create_context */

    40 

    41 #if SDL_VIDEO_DRIVER_RPI

    42 /* Raspbian places the OpenGL ES/EGL binaries in a non standard path */

    43 #define DEFAULT_EGL "/opt/vc/lib/libEGL.so"

    44 #define DEFAULT_OGL_ES2 "/opt/vc/lib/libGLESv2.so"

    45 #define DEFAULT_OGL_ES_PVR "/opt/vc/lib/libGLES_CM.so"

    46 #define DEFAULT_OGL_ES "/opt/vc/lib/libGLESv1_CM.so"

    47 

    48 #elif SDL_VIDEO_DRIVER_ANDROID || SDL_VIDEO_DRIVER_VIVANTE

    49 /* Android */

    50 #define DEFAULT_EGL "libEGL.so"

    51 #define DEFAULT_OGL_ES2 "libGLESv2.so"

    52 #define DEFAULT_OGL_ES_PVR "libGLES_CM.so"

    53 #define DEFAULT_OGL_ES "libGLESv1_CM.so"

    54 

    55 #elif SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT

    56 /* EGL AND OpenGL ES support via ANGLE */

    57 #define DEFAULT_EGL "libEGL.dll"

    58 #define DEFAULT_OGL_ES2 "libGLESv2.dll"

    59 #define DEFAULT_OGL_ES_PVR "libGLES_CM.dll"

    60 #define DEFAULT_OGL_ES "libGLESv1_CM.dll"

    61 

    62 #else

    63 /* Desktop Linux */

    64 #define DEFAULT_OGL "libGL.so.1"

    65 #define DEFAULT_EGL "libEGL.so.1"

    66 #define DEFAULT_OGL_ES2 "libGLESv2.so.2"

    67 #define DEFAULT_OGL_ES_PVR "libGLES_CM.so.1"

    68 #define DEFAULT_OGL_ES "libGLESv1_CM.so.1"

    69 #endif /* SDL_VIDEO_DRIVER_RPI */

    70 

    71 #define LOAD_FUNC(NAME) \

    72 _this->egl_data->NAME = SDL_LoadFunction(_this->egl_data->dll_handle, #NAME); \

    73 if (!_this->egl_data->NAME) \

    74 { \

    75     return SDL_SetError("Could not retrieve EGL function " #NAME); \

    76 }

    77     

    78 /* EGL implementation of SDL OpenGL ES support */

    79 #ifdef EGL_KHR_create_context        

    80 static int SDL_EGL_HasExtension(_THIS, const char *ext)

    81 {

    82     int i;

    83     int len = 0;

    84     size_t ext_len;

    85     const char *exts;

    86     const char *ext_word;

    87 

    88     ext_len = SDL_strlen(ext);

    89     exts = _this->egl_data->eglQueryString(_this->egl_data->egl_display, EGL_EXTENSIONS);

    90 

    91     if (exts) {

    92         ext_word = exts;

    93 

    94         for (i = 0; exts[i] != 0; i++) {

    95             if (exts[i] == ' ') {

    96                 if (ext_len == len && !SDL_strncmp(ext_word, ext, len)) {

    97                     return 1;

    98                 }

    99 

   100                 len = 0;

   101                 ext_word = &exts[i + 1];

   102             } else {

   103                 len++;

   104             }

   105         }

   106     }

   107 

   108     return 0;

   109 }

   110 #endif /* EGL_KHR_create_context */

   111 

   112 void *

   113 SDL_EGL_GetProcAddress(_THIS, const char *proc)

   114 {

   115     static char procname[1024];

   116     void *retval;

   117     

   118     /* eglGetProcAddress is busted on Android http://code.google.com/p/android/issues/detail?id=7681 */

   119 #if !defined(SDL_VIDEO_DRIVER_ANDROID) && !defined(SDL_VIDEO_DRIVER_MIR) 

   120     if (_this->egl_data->eglGetProcAddress) {

   121         retval = _this->egl_data->eglGetProcAddress(proc);

   122         if (retval) {

   123             return retval;

   124         }

   125     }

   126 #endif

   127     

   128     retval = SDL_LoadFunction(_this->egl_data->egl_dll_handle, proc);

   129     if (!retval && SDL_strlen(proc) <= 1022) {

   130         procname[0] = '_';

   131         SDL_strlcpy(procname + 1, proc, 1022);

   132         retval = SDL_LoadFunction(_this->egl_data->egl_dll_handle, procname);

   133     }

   134     return retval;

   135 }

   136 

   137 void

   138 SDL_EGL_UnloadLibrary(_THIS)

   139 {

   140     if (_this->egl_data) {

   141         if (_this->egl_data->egl_display) {

   142             _this->egl_data->eglTerminate(_this->egl_data->egl_display);

   143             _this->egl_data->egl_display = NULL;

   144         }

   145 

   146         if (_this->egl_data->dll_handle) {

   147             SDL_UnloadObject(_this->egl_data->dll_handle);

   148             _this->egl_data->dll_handle = NULL;

   149         }

   150         if (_this->egl_data->egl_dll_handle) {

   151             SDL_UnloadObject(_this->egl_data->egl_dll_handle);

   152             _this->egl_data->egl_dll_handle = NULL;

   153         }

   154         

   155         SDL_free(_this->egl_data);

   156         _this->egl_data = NULL;

   157     }

   158 }

   159 

   160 int

   161 SDL_EGL_LoadLibrary(_THIS, const char *egl_path, NativeDisplayType native_display)

   162 {

   163     void *dll_handle = NULL, *egl_dll_handle = NULL; /* The naming is counter intuitive, but hey, I just work here -- Gabriel */

   164     const char *path = NULL;

   165 #if SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT

   166     const char *d3dcompiler;

   167 #endif

   168 

   169     if (_this->egl_data) {

   170         return SDL_SetError("OpenGL ES context already created");

   171     }

   172 

   173     _this->egl_data = (struct SDL_EGL_VideoData *) SDL_calloc(1, sizeof(SDL_EGL_VideoData));

   174     if (!_this->egl_data) {

   175         return SDL_OutOfMemory();

   176     }

   177 

   178 #if SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT

   179     d3dcompiler = SDL_GetHint(SDL_HINT_VIDEO_WIN_D3DCOMPILER);

   180     if (!d3dcompiler) {

   181         if (WIN_IsWindowsVistaOrGreater()) {

   182             d3dcompiler = "d3dcompiler_46.dll";

   183         } else {

   184             d3dcompiler = "d3dcompiler_43.dll";

   185         }

   186     }

   187     if (SDL_strcasecmp(d3dcompiler, "none") != 0) {

   188         SDL_LoadObject(d3dcompiler);

   189     }

   190 #endif

   191 

   192     /* A funny thing, loading EGL.so first does not work on the Raspberry, so we load libGL* first */

   193     path = SDL_getenv("SDL_VIDEO_GL_DRIVER");

   194     if (path != NULL) {

   195         egl_dll_handle = SDL_LoadObject(path);

   196     }

   197 

   198     if (egl_dll_handle == NULL) {

   199         if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {

   200             if (_this->gl_config.major_version > 1) {

   201                 path = DEFAULT_OGL_ES2;

   202                 egl_dll_handle = SDL_LoadObject(path);

   203             } else {

   204                 path = DEFAULT_OGL_ES;

   205                 egl_dll_handle = SDL_LoadObject(path);

   206                 if (egl_dll_handle == NULL) {

   207                     path = DEFAULT_OGL_ES_PVR;

   208                     egl_dll_handle = SDL_LoadObject(path);

   209                 }

   210             }

   211         }

   212 #ifdef DEFAULT_OGL         

   213         else {

   214             path = DEFAULT_OGL;

   215             egl_dll_handle = SDL_LoadObject(path);

   216         }

   217 #endif        

   218     }

   219     _this->egl_data->egl_dll_handle = egl_dll_handle;

   220 

   221     if (egl_dll_handle == NULL) {

   222         return SDL_SetError("Could not initialize OpenGL / GLES library");

   223     }

   224 

   225     /* Loading libGL* in the previous step took care of loading libEGL.so, but we future proof by double checking */

   226     if (egl_path != NULL) {

   227         dll_handle = SDL_LoadObject(egl_path);

   228     }   

   229     /* Try loading a EGL symbol, if it does not work try the default library paths */

   230     if (dll_handle == NULL || SDL_LoadFunction(dll_handle, "eglChooseConfig") == NULL) {

   231         if (dll_handle != NULL) {

   232             SDL_UnloadObject(dll_handle);

   233         }

   234         path = SDL_getenv("SDL_VIDEO_EGL_DRIVER");

   235         if (path == NULL) {

   236             path = DEFAULT_EGL;

   237         }

   238         dll_handle = SDL_LoadObject(path);

   239         if (dll_handle == NULL || SDL_LoadFunction(dll_handle, "eglChooseConfig") == NULL) {

   240             if (dll_handle != NULL) {

   241                 SDL_UnloadObject(dll_handle);

   242             }

   243             return SDL_SetError("Could not load EGL library");

   244         }

   245         SDL_ClearError();

   246     }

   247 

   248     _this->egl_data->dll_handle = dll_handle;

   249 

   250     /* Load new function pointers */

   251     LOAD_FUNC(eglGetDisplay);

   252     LOAD_FUNC(eglInitialize);

   253     LOAD_FUNC(eglTerminate);

   254     LOAD_FUNC(eglGetProcAddress);

   255     LOAD_FUNC(eglChooseConfig);

   256     LOAD_FUNC(eglGetConfigAttrib);

   257     LOAD_FUNC(eglCreateContext);

   258     LOAD_FUNC(eglDestroyContext);

   259     LOAD_FUNC(eglCreateWindowSurface);

   260     LOAD_FUNC(eglDestroySurface);

   261     LOAD_FUNC(eglMakeCurrent);

   262     LOAD_FUNC(eglSwapBuffers);

   263     LOAD_FUNC(eglSwapInterval);

   264     LOAD_FUNC(eglWaitNative);

   265     LOAD_FUNC(eglWaitGL);

   266     LOAD_FUNC(eglBindAPI);

   267     LOAD_FUNC(eglQueryString);

   268     

   269 #if !defined(__WINRT__)

   270     _this->egl_data->egl_display = _this->egl_data->eglGetDisplay(native_display);

   271     if (!_this->egl_data->egl_display) {

   272         return SDL_SetError("Could not get EGL display");

   273     }

   274     

   275     if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {

   276         return SDL_SetError("Could not initialize EGL");

   277     }

   278 #endif

   279 

   280     _this->gl_config.driver_loaded = 1;

   281 

   282     if (path) {

   283         SDL_strlcpy(_this->gl_config.driver_path, path, sizeof(_this->gl_config.driver_path) - 1);

   284     } else {

   285         *_this->gl_config.driver_path = '\0';

   286     }

   287     

   288     return 0;

   289 }

   290 

   291 int

   292 SDL_EGL_ChooseConfig(_THIS) 

   293 {

   294     /* 64 seems nice. */

   295     EGLint attribs[64];

   296     EGLint found_configs = 0, value;

   297     /* 128 seems even nicer here */

   298     EGLConfig configs[128];

   299     int i, j, best_bitdiff = -1, bitdiff;

   300     

   301     if (!_this->egl_data) {

   302         /* The EGL library wasn't loaded, SDL_GetError() should have info */

   303         return -1;

   304     }

   305   

   306     /* Get a valid EGL configuration */

   307     i = 0;

   308     attribs[i++] = EGL_RED_SIZE;

   309     attribs[i++] = _this->gl_config.red_size;

   310     attribs[i++] = EGL_GREEN_SIZE;

   311     attribs[i++] = _this->gl_config.green_size;

   312     attribs[i++] = EGL_BLUE_SIZE;

   313     attribs[i++] = _this->gl_config.blue_size;

   314     

   315     if (_this->gl_config.alpha_size) {

   316         attribs[i++] = EGL_ALPHA_SIZE;

   317         attribs[i++] = _this->gl_config.alpha_size;

   318     }

   319     

   320     if (_this->gl_config.buffer_size) {

   321         attribs[i++] = EGL_BUFFER_SIZE;

   322         attribs[i++] = _this->gl_config.buffer_size;

   323     }

   324     

   325     attribs[i++] = EGL_DEPTH_SIZE;

   326     attribs[i++] = _this->gl_config.depth_size;

   327     

   328     if (_this->gl_config.stencil_size) {

   329         attribs[i++] = EGL_STENCIL_SIZE;

   330         attribs[i++] = _this->gl_config.stencil_size;

   331     }

   332     

   333     if (_this->gl_config.multisamplebuffers) {

   334         attribs[i++] = EGL_SAMPLE_BUFFERS;

   335         attribs[i++] = _this->gl_config.multisamplebuffers;

   336     }

   337     

   338     if (_this->gl_config.multisamplesamples) {

   339         attribs[i++] = EGL_SAMPLES;

   340         attribs[i++] = _this->gl_config.multisamplesamples;

   341     }

   342 

   343     if (_this->gl_config.framebuffer_srgb_capable) {

   344 #ifdef EGL_KHR_gl_colorspace

   345         if (SDL_EGL_HasExtension(_this, "EGL_KHR_gl_colorspace")) {

   346             attribs[i++] = EGL_GL_COLORSPACE_KHR;

   347             attribs[i++] = EGL_GL_COLORSPACE_SRGB_KHR;

   348         } else

   349 #endif

   350         {

   351             return SDL_SetError("EGL implementation does not support sRGB system framebuffers");

   352         }

   353     }

   354 

   355     attribs[i++] = EGL_RENDERABLE_TYPE;

   356     if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {

   357 #ifdef EGL_KHR_create_context

   358         if (_this->gl_config.major_version >= 3 &&

   359             SDL_EGL_HasExtension(_this, "EGL_KHR_create_context")) {

   360             attribs[i++] = EGL_OPENGL_ES3_BIT_KHR;

   361         } else

   362 #endif

   363         if (_this->gl_config.major_version >= 2) {

   364             attribs[i++] = EGL_OPENGL_ES2_BIT;

   365         } else {

   366             attribs[i++] = EGL_OPENGL_ES_BIT;

   367         }

   368         _this->egl_data->eglBindAPI(EGL_OPENGL_ES_API);

   369     } else {

   370         attribs[i++] = EGL_OPENGL_BIT;

   371         _this->egl_data->eglBindAPI(EGL_OPENGL_API);

   372     }

   373 

   374     attribs[i++] = EGL_NONE;

   375 

   376     if (_this->egl_data->eglChooseConfig(_this->egl_data->egl_display,

   377         attribs,

   378         configs, SDL_arraysize(configs),

   379         &found_configs) == EGL_FALSE ||

   380         found_configs == 0) {

   381         return SDL_SetError("Couldn't find matching EGL config");

   382     }

   383 

   384     /* eglChooseConfig returns a number of configurations that match or exceed the requested attribs. */

   385     /* From those, we select the one that matches our requirements more closely via a makeshift algorithm */

   386 

   387     for (i = 0; i < found_configs; i++ ) {

   388         bitdiff = 0;

   389         for (j = 0; j < SDL_arraysize(attribs) - 1; j += 2) {

   390             if (attribs[j] == EGL_NONE) {

   391                break;

   392             }

   393             

   394             if ( attribs[j+1] != EGL_DONT_CARE && (

   395                 attribs[j] == EGL_RED_SIZE ||

   396                 attribs[j] == EGL_GREEN_SIZE ||

   397                 attribs[j] == EGL_BLUE_SIZE ||

   398                 attribs[j] == EGL_ALPHA_SIZE ||

   399                 attribs[j] == EGL_DEPTH_SIZE ||

   400                 attribs[j] == EGL_STENCIL_SIZE)) {

   401                 _this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display, configs[i], attribs[j], &value);

   402                 bitdiff += value - attribs[j + 1]; /* value is always >= attrib */

   403             }

   404         }

   405 

   406         if (bitdiff < best_bitdiff || best_bitdiff == -1) {

   407             _this->egl_data->egl_config = configs[i];

   408             

   409             best_bitdiff = bitdiff;

   410         }

   411 

   412         if (bitdiff == 0) {

   413             break; /* we found an exact match! */

   414         }

   415     }

   416     

   417     return 0;

   418 }

   419 

   420 SDL_GLContext

   421 SDL_EGL_CreateContext(_THIS, EGLSurface egl_surface)

   422 {

   423     /* max 14 values plus terminator. */

   424     EGLint attribs[15];

   425     int attr = 0;

   426 

   427     EGLContext egl_context, share_context = EGL_NO_CONTEXT;

   428     EGLint profile_mask = _this->gl_config.profile_mask;

   429     EGLint major_version = _this->gl_config.major_version;

   430     EGLint minor_version = _this->gl_config.minor_version;

   431     SDL_bool profile_es = (profile_mask == SDL_GL_CONTEXT_PROFILE_ES);

   432 

   433     if (!_this->egl_data) {

   434         /* The EGL library wasn't loaded, SDL_GetError() should have info */

   435         return NULL;

   436     }

   437 

   438     if (_this->gl_config.share_with_current_context) {

   439         share_context = (EGLContext)SDL_GL_GetCurrentContext();

   440     }

   441 

   442     /* Set the context version and other attributes. */

   443     if ((major_version < 3 || (minor_version == 0 && profile_es)) &&

   444         _this->gl_config.flags == 0 &&

   445         (profile_mask == 0 || profile_es)) {

   446         /* Create a context without using EGL_KHR_create_context attribs.

   447          * When creating a GLES context without EGL_KHR_create_context we can

   448          * only specify the major version. When creating a desktop GL context

   449          * we can't specify any version, so we only try in that case when the

   450          * version is less than 3.0 (matches SDL's GLX/WGL behavior.)

   451          */

   452         if (profile_es) {

   453             attribs[attr++] = EGL_CONTEXT_CLIENT_VERSION;

   454             attribs[attr++] = SDL_max(major_version, 1);

   455         }

   456     } else {

   457 #ifdef EGL_KHR_create_context

   458         /* The Major/minor version, context profiles, and context flags can

   459          * only be specified when this extension is available.

   460          */

   461         if (SDL_EGL_HasExtension(_this, "EGL_KHR_create_context")) {

   462             attribs[attr++] = EGL_CONTEXT_MAJOR_VERSION_KHR;

   463             attribs[attr++] = major_version;

   464             attribs[attr++] = EGL_CONTEXT_MINOR_VERSION_KHR;

   465             attribs[attr++] = minor_version;

   466 

   467             /* SDL profile bits match EGL profile bits. */

   468             if (profile_mask != 0 && profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {

   469                 attribs[attr++] = EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR;

   470                 attribs[attr++] = profile_mask;

   471             }

   472 

   473             /* SDL flags match EGL flags. */

   474             if (_this->gl_config.flags != 0) {

   475                 attribs[attr++] = EGL_CONTEXT_FLAGS_KHR;

   476                 attribs[attr++] = _this->gl_config.flags;

   477             }

   478         } else

   479 #endif /* EGL_KHR_create_context */

   480         {

   481             SDL_SetError("Could not create EGL context (context attributes are not supported)");

   482             return NULL;

   483         }

   484     }

   485 

   486     attribs[attr++] = EGL_NONE;

   487 

   488     /* Bind the API */

   489     if (profile_es) {

   490         _this->egl_data->eglBindAPI(EGL_OPENGL_ES_API);

   491     } else {

   492         _this->egl_data->eglBindAPI(EGL_OPENGL_API);

   493     }

   494 

   495     egl_context = _this->egl_data->eglCreateContext(_this->egl_data->egl_display,

   496                                       _this->egl_data->egl_config,

   497                                       share_context, attribs);

   498 

   499     if (egl_context == EGL_NO_CONTEXT) {

   500         SDL_SetError("Could not create EGL context");

   501         return NULL;

   502     }

   503 

   504     _this->egl_data->egl_swapinterval = 0;

   505 

   506     if (SDL_EGL_MakeCurrent(_this, egl_surface, egl_context) < 0) {

   507         SDL_EGL_DeleteContext(_this, egl_context);

   508         SDL_SetError("Could not make EGL context current");

   509         return NULL;

   510     }

   511 

   512     return (SDL_GLContext) egl_context;

   513 }

   514 

   515 int

   516 SDL_EGL_MakeCurrent(_THIS, EGLSurface egl_surface, SDL_GLContext context)

   517 {

   518     EGLContext egl_context = (EGLContext) context;

   519 

   520     if (!_this->egl_data) {

   521         return SDL_SetError("OpenGL not initialized");

   522     }

   523     

   524     /* The android emulator crashes badly if you try to eglMakeCurrent 

   525      * with a valid context and invalid surface, so we have to check for both here.

   526      */

   527     if (!egl_context || !egl_surface) {

   528          _this->egl_data->eglMakeCurrent(_this->egl_data->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);

   529     } else {

   530         if (!_this->egl_data->eglMakeCurrent(_this->egl_data->egl_display,

   531             egl_surface, egl_surface, egl_context)) {

   532             return SDL_SetError("Unable to make EGL context current");

   533         }

   534     }

   535       

   536     return 0;

   537 }

   538 

   539 int

   540 SDL_EGL_SetSwapInterval(_THIS, int interval)

   541 {

   542     EGLBoolean status;

   543     

   544     if (!_this->egl_data) {

   545         return SDL_SetError("EGL not initialized");

   546     }

   547     

   548     status = _this->egl_data->eglSwapInterval(_this->egl_data->egl_display, interval);

   549     if (status == EGL_TRUE) {

   550         _this->egl_data->egl_swapinterval = interval;

   551         return 0;

   552     }

   553     

   554     return SDL_SetError("Unable to set the EGL swap interval");

   555 }

   556 

   557 int

   558 SDL_EGL_GetSwapInterval(_THIS)

   559 {

   560     if (!_this->egl_data) {

   561         SDL_SetError("EGL not initialized");

   562         return 0;

   563     }

   564     

   565     return _this->egl_data->egl_swapinterval;

   566 }

   567 

   568 void

   569 SDL_EGL_SwapBuffers(_THIS, EGLSurface egl_surface)

   570 {

   571     _this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, egl_surface);

   572 }

   573 

   574 void

   575 SDL_EGL_DeleteContext(_THIS, SDL_GLContext context)

   576 {

   577     EGLContext egl_context = (EGLContext) context;

   578 

   579     /* Clean up GLES and EGL */

   580     if (!_this->egl_data) {

   581         return;

   582     }

   583     

   584     if (egl_context != NULL && egl_context != EGL_NO_CONTEXT) {

   585         SDL_EGL_MakeCurrent(_this, NULL, NULL);

   586         _this->egl_data->eglDestroyContext(_this->egl_data->egl_display, egl_context);

   587     }

   588         

   589 }

   590 

   591 EGLSurface *

   592 SDL_EGL_CreateSurface(_THIS, NativeWindowType nw) 

   593 {

   594     if (SDL_EGL_ChooseConfig(_this) != 0) {

   595         return EGL_NO_SURFACE;

   596     }

   597     

   598 #if __ANDROID__

   599     {

   600         /* Android docs recommend doing this!

   601          * Ref: http://developer.android.com/reference/android/app/NativeActivity.html 

   602          */

   603         EGLint format;

   604         _this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display,

   605                                             _this->egl_data->egl_config, 

   606                                             EGL_NATIVE_VISUAL_ID, &format);

   607 

   608         ANativeWindow_setBuffersGeometry(nw, 0, 0, format);

   609     }

   610 #endif    

   611     

   612     return _this->egl_data->eglCreateWindowSurface(

   613             _this->egl_data->egl_display,

   614             _this->egl_data->egl_config,

   615             nw, NULL);

   616 }

   617 

   618 void

   619 SDL_EGL_DestroySurface(_THIS, EGLSurface egl_surface) 

   620 {

   621     if (!_this->egl_data) {

   622         return;

   623     }

   624     

   625     if (egl_surface != EGL_NO_SURFACE) {

   626         _this->egl_data->eglDestroySurface(_this->egl_data->egl_display, egl_surface);

   627     }

   628 }

   629 

   630 #endif /* SDL_VIDEO_OPENGL_EGL */

   631 

   632 /* vi: set ts=4 sw=4 expandtab: */

   633
SDL