src/video/x11/SDL_x11opengles.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 31 Oct 2011 05:56:58 -0400
changeset 6044 35448a5ea044
parent 5535 96594ac5fd1a
child 6138 4c64952a58fb
permissions -rw-r--r--
Lots of fixes importing SDL source wholesale into a new iOS project
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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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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  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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  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_DRIVER_X11 && SDL_VIDEO_OPENGL_ES
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#include "SDL_x11video.h"
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#include "SDL_x11opengles.h"
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#define DEFAULT_OPENGL	"/usr/lib/libGLES_CM.so"
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#define LOAD_FUNC(NAME) \
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	*((void**)&_this->gles_data->NAME) = dlsym(handle, #NAME); \
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	if (!_this->gles_data->NAME) \
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	{ \
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		SDL_SetError("Could not retrieve EGL function " #NAME); \
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		return -1; \
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	}
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/* GLES implementation of SDL OpenGL support */
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void *
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X11_GLES_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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    handle = _this->gl_config.dll_handle;
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    if (_this->gles_data->eglGetProcAddress) {
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        retval = _this->gles_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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#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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X11_GLES_UnloadLibrary(_THIS)
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{
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    if (_this->gl_config.driver_loaded) {
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        _this->gles_data->eglTerminate(_this->gles_data->egl_display);
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        dlclose(_this->gl_config.dll_handle);
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        _this->gles_data->eglGetProcAddress = NULL;
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        _this->gles_data->eglChooseConfig = NULL;
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        _this->gles_data->eglCreateContext = NULL;
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        _this->gles_data->eglCreateWindowSurface = NULL;
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        _this->gles_data->eglDestroyContext = NULL;
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        _this->gles_data->eglDestroySurface = NULL;
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        _this->gles_data->eglMakeCurrent = NULL;
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        _this->gles_data->eglSwapBuffers = NULL;
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        _this->gles_data->eglGetDisplay = NULL;
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        _this->gles_data->eglTerminate = NULL;
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        _this->gl_config.dll_handle = NULL;
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        _this->gl_config.driver_loaded = 0;
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    }
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}
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int
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X11_GLES_LoadLibrary(_THIS, const char *path)
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{
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    void *handle;
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    int dlopen_flags;
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    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
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    if (_this->gles_data->egl_active) {
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        SDL_SetError("OpenGL ES context already created");
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        return -1;
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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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    handle = dlopen(path, dlopen_flags);
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    /* Catch the case where the application isn't linked with EGL */
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    if ((dlsym(handle, "eglChooseConfig") == NULL) && (path == NULL)) {
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        dlclose(handle);
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        path = getenv("SDL_VIDEO_GL_DRIVER");
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        if (path == NULL) {
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            path = DEFAULT_OPENGL;
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        }
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        handle = dlopen(path, dlopen_flags);
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    }
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    if (handle == NULL) {
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        SDL_SetError("Could not load OpenGL ES/EGL library");
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        return -1;
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    }
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    /* Unload the old driver and reset the pointers */
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    X11_GLES_UnloadLibrary(_this);
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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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    _this->gles_data->egl_display =
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        _this->gles_data->eglGetDisplay((NativeDisplayType) data->display);
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    if (!_this->gles_data->egl_display) {
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        SDL_SetError("Could not get EGL display");
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        return -1;
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    }
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    if (_this->gles_data->
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        eglInitialize(_this->gles_data->egl_display, NULL,
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                      NULL) != EGL_TRUE) {
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        SDL_SetError("Could not initialize EGL");
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        return -1;
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    }
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    _this->gl_config.dll_handle = 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,
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                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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    return 0;
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}
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XVisualInfo *
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X11_GLES_GetVisual(_THIS, Display * display, int screen)
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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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    VisualID visual_id;
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    int i;
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    /* load the gl driver from a default path */
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    if (!_this->gl_config.driver_loaded) {
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        /* no driver has been loaded, use default (ourselves) */
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        if (X11_GLES_LoadLibrary(_this, NULL) < 0) {
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            return NULL;
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        }
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    }
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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_NONE;
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    if (_this->gles_data->eglChooseConfig(_this->gles_data->egl_display,
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                                          attribs,
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                                          &_this->gles_data->egl_config, 1,
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                                          &found_configs) == EGL_FALSE ||
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        found_configs == 0) {
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        SDL_SetError("Couldn't find matching EGL config");
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        return NULL;
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    }
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    if (_this->gles_data->eglGetConfigAttrib(_this->gles_data->egl_display,
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                                             _this->gles_data->egl_config,
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                                             EGL_NATIVE_VISUAL_ID,
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                                             (EGLint *) & visual_id) ==
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        EGL_FALSE || !visual_id) {
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        /* Use the default visual when all else fails */
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        XVisualInfo vi_in;
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        int out_count;
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        vi_in.screen = screen;
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        _this->gles_data->egl_visualinfo = XGetVisualInfo(display,
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                                                          VisualScreenMask,
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                                                          &vi_in, &out_count);
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    } else {
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        XVisualInfo vi_in;
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        int out_count;
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        vi_in.screen = screen;
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        vi_in.visualid = visual_id;
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        _this->gles_data->egl_visualinfo = XGetVisualInfo(display,
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                                                          VisualScreenMask |
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                                                          VisualIDMask,
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                                                          &vi_in, &out_count);
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    }
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    return _this->gles_data->egl_visualinfo;
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}
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SDL_GLContext
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X11_GLES_CreateContext(_THIS, SDL_Window * window)
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{
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    int retval;
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    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
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    Display *display = data->videodata->display;
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    XSync(display, False);
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    _this->gles_data->egl_context =
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        _this->gles_data->eglCreateContext(_this->gles_data->egl_display,
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                                           _this->gles_data->egl_config,
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                                           EGL_NO_CONTEXT, NULL);
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    XSync(display, False);
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    if (_this->gles_data->egl_context == EGL_NO_CONTEXT) {
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        SDL_SetError("Could not create EGL context");
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        return NULL;
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    }
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    _this->gles_data->egl_active = 1;
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    if (_this->gles_data->egl_active)
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        retval = 1;
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    else
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        retval = 0;
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    return (retval);
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}
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int
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X11_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
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{
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    int retval;
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//    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
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//    Display *display = data->videodata->display;
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    retval = 1;
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    if (!_this->gles_data->eglMakeCurrent(_this->gles_data->egl_display,
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                                          _this->gles_data->egl_surface,
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                                          _this->gles_data->egl_surface,
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                                          _this->gles_data->egl_context)) {
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        SDL_SetError("Unable to make EGL context current");
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        retval = -1;
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    }
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//    XSync(display, False);
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    return (retval);
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}
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static int swapinterval = -1;
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int
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X11_GLES_SetSwapInterval(_THIS, int interval)
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{
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    return 0;
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}
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int
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X11_GLES_GetSwapInterval(_THIS)
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{
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    return 0;
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}
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void
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X11_GLES_SwapWindow(_THIS, SDL_Window * window)
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{
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    _this->gles_data->eglSwapBuffers(_this->gles_data->egl_display,
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                                     _this->gles_data->egl_surface);
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}
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void
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X11_GLES_DeleteContext(_THIS, SDL_GLContext context)
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{
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    /* Clean up GLES and EGL */
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    if (_this->gles_data->egl_context != EGL_NO_CONTEXT ||
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        _this->gles_data->egl_surface != EGL_NO_SURFACE) {
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        _this->gles_data->eglMakeCurrent(_this->gles_data->egl_display,
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                                         EGL_NO_SURFACE, EGL_NO_SURFACE,
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                                         EGL_NO_CONTEXT);
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        if (_this->gles_data->egl_context != EGL_NO_CONTEXT) {
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            _this->gles_data->eglDestroyContext(_this->gles_data->egl_display,
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                                                _this->gles_data->
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                                                egl_context);
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            _this->gles_data->egl_context = EGL_NO_CONTEXT;
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        }
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        if (_this->gles_data->egl_surface != EGL_NO_SURFACE) {
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            _this->gles_data->eglDestroySurface(_this->gles_data->egl_display,
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                                                _this->gles_data->
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                                                egl_surface);
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            _this->gles_data->egl_surface = EGL_NO_SURFACE;
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   354
        }
slouken@3190
   355
    }
slouken@3190
   356
    _this->gles_data->egl_active = 0;
slouken@3218
   357
slouken@3218
   358
/* crappy fix */
slouken@3218
   359
    X11_GLES_UnloadLibrary(_this);
slouken@3218
   360
slouken@3190
   361
}
slouken@3190
   362
slouken@6044
   363
#endif /* SDL_VIDEO_DRIVER_X11 && SDL_VIDEO_OPENGL_ES */
slouken@3190
   364
slouken@3190
   365
/* vi: set ts=4 sw=4 expandtab: */