src/video/SDL_egl.c
author David Ludwig <dludwig@pobox.com>
Mon, 04 Nov 2013 19:54:29 -0500
changeset 8541 0041edb891f3
parent 7865 f2a42ca4ddf0
child 8543 b9dd3cf38585
permissions -rw-r--r--
WinRT: added experimental OpenGL ES 2.0 support

A port of the ANGLE library (OpenGL ES 2.0 for Direct3D) to WinRT, via https://github.com/stammen/angleproject, is used as a base.

To enable, clone 'angleproject' into the directory one above where SDL/WinRT is, open the file SDL/include/SDL_config_winrt.h, and uncomment the #defines that begin with 'SDL_VIDEO_OPENGL'. From there, apps can create an OpenGL capable SDL_Window via the flag, SDL_WINDOW_OPENGL, and an OpenGL ES 2 context via SDL_GL_CreateContext. The Direct3D 11.1 renderer cannot be used alongside SDL_WINDOW_OPENGL. Only Windows 8/8.1 is supported for now. Shaders may need to be precompiled, in some (all?) cases.
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/*
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 *  Simple DirectMedia Layer
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 *  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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 * 
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 *  This software is provided 'as-is', without any express or implied
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 *  warranty.  In no event will the authors be held liable for any damages
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 *  arising from the use of this software.
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 * 
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 *  Permission is granted to anyone to use this software for any purpose,
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 *  including commercial applications, and to alter it and redistribute it
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 *  freely, subject to the following restrictions:
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 * 
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 *  1. The origin of this software must not be misrepresented; you must not
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 *     claim that you wrote the original software. If you use this software
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 *     in a product, an acknowledgment in the product documentation would be
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 *     appreciated but is not required.
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 *  2. Altered source versions must be plainly marked as such, and must not be
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 *     misrepresented as being the original software.
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 *  3. This notice may not be removed or altered from any source distribution.
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 */
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#include "SDL_config.h"
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#if SDL_VIDEO_OPENGL_EGL
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#include "SDL_sysvideo.h"
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#include "SDL_egl.h"
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#if SDL_VIDEO_DRIVER_RPI
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/* Raspbian places the OpenGL ES/EGL binaries in a non standard path */
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#define DEFAULT_EGL "/opt/vc/lib/libEGL.so"
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#define DEFAULT_OGL_ES2 "/opt/vc/lib/libGLESv2.so"
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#define DEFAULT_OGL_ES_PVR "/opt/vc/lib/libGLES_CM.so"
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#define DEFAULT_OGL_ES "/opt/vc/lib/libGLESv1_CM.so"
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#elif SDL_VIDEO_DRIVER_ANDROID
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/* Android */
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#define DEFAULT_EGL "libEGL.so"
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#define DEFAULT_OGL_ES2 "libGLESv2.so"
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#define DEFAULT_OGL_ES_PVR "libGLES_CM.so"
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#define DEFAULT_OGL_ES "libGLESv1_CM.so"
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#elif SDL_VIDEO_DRIVER_WINRT
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/* WinRT (via a modified version of Google's ANGLE library) */
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#define DEFAULT_EGL "libEGL.dll"
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#define DEFAULT_OGL_ES2 "libGLESv2.dll"
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#define DEFAULT_OGL_ES_PVR NULL
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#define DEFAULT_OGL_ES NULL
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#else
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/* Desktop Linux */
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#define DEFAULT_EGL "libEGL.so.1"
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#define DEFAULT_OGL_ES2 "libGLESv2.so.2"
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#define DEFAULT_OGL_ES_PVR "libGLES_CM.so.1"
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#define DEFAULT_OGL_ES "libGLESv1_CM.so.1"
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#endif /* SDL_VIDEO_DRIVER_RPI */
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#define LOAD_FUNC(NAME) \
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*((void**)&_this->egl_data->NAME) = dlsym(dll_handle, #NAME); \
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if (!_this->egl_data->NAME) \
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{ \
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    return SDL_SetError("Could not retrieve EGL function " #NAME); \
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}
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/* EGL implementation of SDL OpenGL ES support */
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void *
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SDL_EGL_GetProcAddress(_THIS, const char *proc)
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{
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    static char procname[1024];
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    void *handle;
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    void *retval;
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    /* eglGetProcAddress is busted on Android http://code.google.com/p/android/issues/detail?id=7681 */
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#if !defined(SDL_VIDEO_DRIVER_ANDROID)
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    handle = _this->egl_data->egl_dll_handle;
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    if (_this->egl_data->eglGetProcAddress) {
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        retval = _this->egl_data->eglGetProcAddress(proc);
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        if (retval) {
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            return retval;
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        }
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    }
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#endif
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    handle = _this->gl_config.dll_handle;
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    #if defined(__OpenBSD__) && !defined(__ELF__)
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    #undef dlsym(x,y);
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    #endif
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    retval = dlsym(handle, proc);
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    if (!retval && strlen(proc) <= 1022) {
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        procname[0] = '_';
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        strcpy(procname + 1, proc);
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        retval = dlsym(handle, procname);
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    }
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    return retval;
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}
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void
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SDL_EGL_UnloadLibrary(_THIS)
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{
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    if (_this->egl_data) {
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        if (_this->egl_data->egl_display) {
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            _this->egl_data->eglTerminate(_this->egl_data->egl_display);
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            _this->egl_data->egl_display = NULL;
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        }
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        if (_this->gl_config.dll_handle) {
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            dlclose(_this->gl_config.dll_handle);
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            _this->gl_config.dll_handle = NULL;
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        }
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        if (_this->egl_data->egl_dll_handle) {
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            dlclose(_this->egl_data->egl_dll_handle);
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            _this->egl_data->egl_dll_handle = NULL;
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        }
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        SDL_free(_this->egl_data);
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        _this->egl_data = NULL;
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    }
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}
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int
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SDL_EGL_LoadLibrary(_THIS, const char *egl_path, NativeDisplayType native_display)
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{
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    void *dll_handle, *egl_dll_handle; /* The naming is counter intuitive, but hey, I just work here -- Gabriel */
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    char *path;
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    int dlopen_flags;
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    if (_this->egl_data) {
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        return SDL_SetError("OpenGL ES context already created");
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    }
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    _this->egl_data = (struct SDL_EGL_VideoData *) SDL_calloc(1, sizeof(SDL_EGL_VideoData));
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    if (!_this->egl_data) {
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        return SDL_OutOfMemory();
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    }
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#ifdef RTLD_GLOBAL
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    dlopen_flags = RTLD_LAZY | RTLD_GLOBAL;
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#else
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    dlopen_flags = RTLD_LAZY;
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#endif
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    /* A funny thing, loading EGL.so first does not work on the Raspberry, so we load libGL* first */
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#ifdef __WINRT__
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    path = NULL;
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    egl_dll_handle = NULL;
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#else
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    path = getenv("SDL_VIDEO_GL_DRIVER");
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    egl_dll_handle = dlopen(path, dlopen_flags);
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#endif
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    if ((path == NULL) | (egl_dll_handle == NULL)) {
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        if (_this->gl_config.major_version > 1) {
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            path = DEFAULT_OGL_ES2;
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            egl_dll_handle = dlopen(path, dlopen_flags);
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        } else {
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            path = DEFAULT_OGL_ES;
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            egl_dll_handle = dlopen(path, dlopen_flags);
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            if (egl_dll_handle == NULL) {
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                path = DEFAULT_OGL_ES_PVR;
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                egl_dll_handle = dlopen(path, dlopen_flags);
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            }
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        }
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    }
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    _this->egl_data->egl_dll_handle = egl_dll_handle;
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    if (egl_dll_handle == NULL) {
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        return SDL_SetError("Could not initialize OpenGL ES library: %s", dlerror());
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    }
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    /* Loading libGL* in the previous step took care of loading libEGL.so, but we future proof by double checking */
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    dll_handle = dlopen(egl_path, dlopen_flags);
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    /* Catch the case where the application isn't linked with EGL */
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    if ((dlsym(dll_handle, "eglChooseConfig") == NULL) && (egl_path == NULL)) {
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        dlclose(dll_handle);
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#ifdef __WINRT__
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        path = NULL;
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#else
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        path = getenv("SDL_VIDEO_EGL_DRIVER");
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#endif
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        if (path == NULL) {
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            path = DEFAULT_EGL;
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        }
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        dll_handle = dlopen(path, dlopen_flags);
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    }
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    _this->gl_config.dll_handle = dll_handle;
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    if (dll_handle == NULL) {
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        return SDL_SetError("Could not load EGL library: %s", dlerror());
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    }
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    /* Load new function pointers */
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    LOAD_FUNC(eglGetDisplay);
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    LOAD_FUNC(eglInitialize);
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    LOAD_FUNC(eglTerminate);
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    LOAD_FUNC(eglGetProcAddress);
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    LOAD_FUNC(eglChooseConfig);
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    LOAD_FUNC(eglGetConfigAttrib);
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    LOAD_FUNC(eglCreateContext);
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    LOAD_FUNC(eglDestroyContext);
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    LOAD_FUNC(eglCreateWindowSurface);
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    LOAD_FUNC(eglDestroySurface);
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    LOAD_FUNC(eglMakeCurrent);
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    LOAD_FUNC(eglSwapBuffers);
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    LOAD_FUNC(eglSwapInterval);
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    LOAD_FUNC(eglWaitNative);
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    LOAD_FUNC(eglWaitGL);
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    _this->egl_data->egl_display = _this->egl_data->eglGetDisplay(native_display);
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    if (!_this->egl_data->egl_display) {
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        return SDL_SetError("Could not get EGL display");
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    }
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    if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
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        return SDL_SetError("Could not initialize EGL");
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    }
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    _this->gl_config.dll_handle = dll_handle;
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    _this->egl_data->egl_dll_handle = egl_dll_handle;
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    _this->gl_config.driver_loaded = 1;
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    if (path) {
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        strncpy(_this->gl_config.driver_path, path, sizeof(_this->gl_config.driver_path) - 1);
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    } else {
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        strcpy(_this->gl_config.driver_path, "");
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    }
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    /* We need to select a config here to satisfy some video backends such as X11 */
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    SDL_EGL_ChooseConfig(_this);
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    return 0;
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}
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int
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SDL_EGL_ChooseConfig(_THIS) 
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{
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    /* 64 seems nice. */
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    EGLint attribs[64];
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    EGLint found_configs = 0;
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    int i;
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    if (!_this->egl_data) {
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        /* The EGL library wasn't loaded, SDL_GetError() should have info */
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        return -1;
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    }
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    /* Get a valid EGL configuration */
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    i = 0;
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    attribs[i++] = EGL_RED_SIZE;
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    attribs[i++] = _this->gl_config.red_size;
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    attribs[i++] = EGL_GREEN_SIZE;
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    attribs[i++] = _this->gl_config.green_size;
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    attribs[i++] = EGL_BLUE_SIZE;
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    attribs[i++] = _this->gl_config.blue_size;
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    if (_this->gl_config.alpha_size) {
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        attribs[i++] = EGL_ALPHA_SIZE;
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        attribs[i++] = _this->gl_config.alpha_size;
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    }
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    if (_this->gl_config.buffer_size) {
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        attribs[i++] = EGL_BUFFER_SIZE;
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        attribs[i++] = _this->gl_config.buffer_size;
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    }
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    attribs[i++] = EGL_DEPTH_SIZE;
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    attribs[i++] = _this->gl_config.depth_size;
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    if (_this->gl_config.stencil_size) {
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        attribs[i++] = EGL_STENCIL_SIZE;
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        attribs[i++] = _this->gl_config.stencil_size;
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    }
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    if (_this->gl_config.multisamplebuffers) {
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        attribs[i++] = EGL_SAMPLE_BUFFERS;
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        attribs[i++] = _this->gl_config.multisamplebuffers;
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    }
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    if (_this->gl_config.multisamplesamples) {
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        attribs[i++] = EGL_SAMPLES;
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        attribs[i++] = _this->gl_config.multisamplesamples;
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    }
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    attribs[i++] = EGL_RENDERABLE_TYPE;
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    if (_this->gl_config.major_version == 2) {
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        attribs[i++] = EGL_OPENGL_ES2_BIT;
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    } else {
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        attribs[i++] = EGL_OPENGL_ES_BIT;
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    }
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    attribs[i++] = EGL_NONE;
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    if (_this->egl_data->eglChooseConfig(_this->egl_data->egl_display,
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        attribs,
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        &_this->egl_data->egl_config, 1,
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        &found_configs) == EGL_FALSE ||
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        found_configs == 0) {
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        return SDL_SetError("Couldn't find matching EGL config");
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   298
    }
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    return 0;
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   301
}
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   303
SDL_GLContext
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SDL_EGL_CreateContext(_THIS, EGLSurface egl_surface)
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{
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    EGLint context_attrib_list[] = {
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        EGL_CONTEXT_CLIENT_VERSION,
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        1,
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        EGL_NONE
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    };
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    EGLContext egl_context;
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   313
    
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    if (!_this->egl_data) {
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        /* The EGL library wasn't loaded, SDL_GetError() should have info */
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        return NULL;
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    }
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    if (_this->gl_config.major_version) {
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        context_attrib_list[1] = _this->gl_config.major_version;
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   321
    }
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   322
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   323
    egl_context =
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   324
    _this->egl_data->eglCreateContext(_this->egl_data->egl_display,
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   325
                                      _this->egl_data->egl_config,
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   326
                                      EGL_NO_CONTEXT, context_attrib_list);
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   327
    
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   328
    if (egl_context == EGL_NO_CONTEXT) {
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   329
        SDL_SetError("Could not create EGL context");
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   330
        return NULL;
gabomdq@7659
   331
    }
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   332
    
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   333
    _this->egl_data->egl_swapinterval = 0;
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   334
    
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   335
    if (SDL_EGL_MakeCurrent(_this, egl_surface, egl_context) < 0) {
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   336
        SDL_EGL_DeleteContext(_this, egl_context);
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   337
        SDL_SetError("Could not make EGL context current");
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   338
        return NULL;
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   339
    }
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   340
  
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   341
    return (SDL_GLContext) egl_context;
gabomdq@7659
   342
}
gabomdq@7659
   343
gabomdq@7659
   344
int
gabomdq@7659
   345
SDL_EGL_MakeCurrent(_THIS, EGLSurface egl_surface, SDL_GLContext context)
gabomdq@7659
   346
{
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   347
    EGLContext egl_context = (EGLContext) context;
gabomdq@7679
   348
gabomdq@7659
   349
    if (!_this->egl_data) {
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   350
        return SDL_SetError("OpenGL not initialized");
gabomdq@7659
   351
    }
gabomdq@7659
   352
    
gabomdq@7659
   353
    /* The android emulator crashes badly if you try to eglMakeCurrent 
gabomdq@7659
   354
     * with a valid context and invalid surface, so we have to check for both here.
gabomdq@7659
   355
     */
gabomdq@7659
   356
    if (!egl_context || !egl_surface) {
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   357
         _this->egl_data->eglMakeCurrent(_this->egl_data->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
gabomdq@7659
   358
    }
gabomdq@7659
   359
    else {
gabomdq@7659
   360
        if (!_this->egl_data->eglMakeCurrent(_this->egl_data->egl_display,
gabomdq@7659
   361
            egl_surface, egl_surface, egl_context)) {
gabomdq@7659
   362
            return SDL_SetError("Unable to make EGL context current");
gabomdq@7659
   363
        }
gabomdq@7659
   364
    }
gabomdq@7659
   365
      
gabomdq@7659
   366
    return 0;
gabomdq@7659
   367
}
gabomdq@7659
   368
gabomdq@7659
   369
int
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   370
SDL_EGL_SetSwapInterval(_THIS, int interval)
gabomdq@7659
   371
{
gabomdq@7679
   372
    EGLBoolean status;
gabomdq@7679
   373
    
gabomdq@7702
   374
    if (!_this->egl_data) {
gabomdq@7702
   375
        return SDL_SetError("EGL not initialized");
gabomdq@7659
   376
    }
gabomdq@7659
   377
    
gabomdq@7659
   378
    status = _this->egl_data->eglSwapInterval(_this->egl_data->egl_display, interval);
gabomdq@7659
   379
    if (status == EGL_TRUE) {
gabomdq@7659
   380
        _this->egl_data->egl_swapinterval = interval;
gabomdq@7659
   381
        return 0;
gabomdq@7659
   382
    }
gabomdq@7659
   383
    
gabomdq@7659
   384
    return SDL_SetError("Unable to set the EGL swap interval");
gabomdq@7659
   385
}
gabomdq@7659
   386
gabomdq@7659
   387
int
gabomdq@7659
   388
SDL_EGL_GetSwapInterval(_THIS)
gabomdq@7659
   389
{
gabomdq@7702
   390
    if (!_this->egl_data) {
gabomdq@7702
   391
        return SDL_SetError("EGL not initialized");
gabomdq@7659
   392
    }
gabomdq@7659
   393
    
gabomdq@7659
   394
    return _this->egl_data->egl_swapinterval;
gabomdq@7659
   395
}
gabomdq@7659
   396
gabomdq@7659
   397
void
gabomdq@7659
   398
SDL_EGL_SwapBuffers(_THIS, EGLSurface egl_surface)
gabomdq@7659
   399
{
gabomdq@7659
   400
    _this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, egl_surface);
gabomdq@7659
   401
}
gabomdq@7659
   402
gabomdq@7659
   403
void
gabomdq@7659
   404
SDL_EGL_DeleteContext(_THIS, SDL_GLContext context)
gabomdq@7659
   405
{
gabomdq@7679
   406
    EGLContext egl_context = (EGLContext) context;
gabomdq@7679
   407
gabomdq@7659
   408
    /* Clean up GLES and EGL */
gabomdq@7659
   409
    if (!_this->egl_data) {
gabomdq@7659
   410
        return;
gabomdq@7659
   411
    }
gabomdq@7659
   412
    
gabomdq@7659
   413
    if (!egl_context && egl_context != EGL_NO_CONTEXT) {
gabomdq@7659
   414
        SDL_EGL_MakeCurrent(_this, NULL, NULL);
gabomdq@7659
   415
        _this->egl_data->eglDestroyContext(_this->egl_data->egl_display, egl_context);
gabomdq@7659
   416
    }
gabomdq@7659
   417
        
gabomdq@7659
   418
    /* FIXME: This "crappy fix" comes from the X11 code, 
gabomdq@7659
   419
     * it's required so you can create a GLX context, destroy it and create a EGL one */
gabomdq@7659
   420
    SDL_EGL_UnloadLibrary(_this);
gabomdq@7659
   421
}
gabomdq@7659
   422
gabomdq@7659
   423
EGLSurface *
gabomdq@7659
   424
SDL_EGL_CreateSurface(_THIS, NativeWindowType nw) 
gabomdq@7659
   425
{
gabomdq@7659
   426
    return _this->egl_data->eglCreateWindowSurface(
gabomdq@7659
   427
            _this->egl_data->egl_display,
gabomdq@7659
   428
            _this->egl_data->egl_config,
gabomdq@7659
   429
            nw, NULL);
gabomdq@7659
   430
}
gabomdq@7659
   431
gabomdq@7659
   432
void
gabomdq@7659
   433
SDL_EGL_DestroySurface(_THIS, EGLSurface egl_surface) 
gabomdq@7659
   434
{
gabomdq@7659
   435
    if (!_this->egl_data) {
gabomdq@7659
   436
        return;
gabomdq@7659
   437
    }
gabomdq@7659
   438
    
gabomdq@7659
   439
    if (egl_surface != EGL_NO_SURFACE) {
gabomdq@7659
   440
        _this->egl_data->eglDestroySurface(_this->egl_data->egl_display, egl_surface);
gabomdq@7659
   441
    }
gabomdq@7659
   442
}
gabomdq@7659
   443
gabomdq@7659
   444
#endif /* SDL_VIDEO_OPENGL_EGL */
gabomdq@7659
   445
gabomdq@7659
   446
/* vi: set ts=4 sw=4 expandtab: */
slouken@7865
   447