Added missing files for OpenGL ES support

libsdl-org · Jun 10, 2009 · 2902232 · 2902232
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diff --git a/src/video/x11/SDL_x11opengles.c b/src/video/x11/SDL_x11opengles.c
@@ -0,0 +1,366 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with _this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+
+    Open Pandora SDL driver
+    Copyright (C) 2009 David Carré
+    (cpasjuste@gmail.com)
+*/
+#include "SDL_config.h"
+
+#if SDL_VIDEO_OPENGL_ES
+
+#include "SDL_x11video.h"
+#include "SDL_x11opengles.h"
+
+#define DEFAULT_OPENGL	"/usr/lib/libGLES_CM.so"
+
+#define LOAD_FUNC(NAME) \
+	*((void**)&_this->gles_data->NAME) = dlsym(handle, #NAME); \
+	if (!_this->gles_data->NAME) \
+	{ \
+		SDL_SetError("Could not retrieve EGL function " #NAME); \
+		return -1; \
+	}
+
+/* GLES implementation of SDL OpenGL support */
+
+void *
+X11_GLES_GetProcAddress(_THIS, const char *proc)
+{
+    static char procname[1024];
+    void *handle;
+    void *retval;
+
+    handle = _this->gl_config.dll_handle;
+    if (_this->gles_data->eglGetProcAddress) {
+        retval = _this->gles_data->eglGetProcAddress(proc);
+        if (retval) {
+            return retval;
+        }
+    }
+#if defined(__OpenBSD__) && !defined(__ELF__)
+#undef dlsym(x,y);
+#endif
+    retval = dlsym(handle, proc);
+    if (!retval && strlen(proc) <= 1022) {
+        procname[0] = '_';
+        strcpy(procname + 1, proc);
+        retval = dlsym(handle, procname);
+    }
+    return retval;
+}
+
+void
+X11_GLES_UnloadLibrary(_THIS)
+{
+    if (_this->gl_config.driver_loaded) {
+        _this->gles_data->eglTerminate(_this->gles_data->egl_display);
+
+        dlclose(_this->gl_config.dll_handle);
+
+        _this->gles_data->eglGetProcAddress = NULL;
+        _this->gles_data->eglChooseConfig = NULL;
+        _this->gles_data->eglCreateContext = NULL;
+        _this->gles_data->eglCreateWindowSurface = NULL;
+        _this->gles_data->eglDestroyContext = NULL;
+        _this->gles_data->eglDestroySurface = NULL;
+        _this->gles_data->eglMakeCurrent = NULL;
+        _this->gles_data->eglSwapBuffers = NULL;
+        _this->gles_data->eglGetDisplay = NULL;
+        _this->gles_data->eglTerminate = NULL;
+
+        _this->gl_config.dll_handle = NULL;
+        _this->gl_config.driver_loaded = 0;
+    }
+}
+
+int
+X11_GLES_LoadLibrary(_THIS, const char *path)
+{
+    void *handle;
+    int dlopen_flags;
+
+    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
+
+    if (_this->gles_data->egl_active) {
+        SDL_SetError("OpenGL ES context already created");
+        return -1;
+    }
+#ifdef RTLD_GLOBAL
+    dlopen_flags = RTLD_LAZY | RTLD_GLOBAL;
+#else
+    dlopen_flags = RTLD_LAZY;
+#endif
+    handle = dlopen(path, dlopen_flags);
+    /* Catch the case where the application isn't linked with EGL */
+    if ((dlsym(handle, "eglChooseConfig") == NULL) && (path == NULL)) {
+
+        dlclose(handle);
+        path = getenv("SDL_VIDEO_GL_DRIVER");
+        if (path == NULL) {
+            path = DEFAULT_OPENGL;
+        }
+        handle = dlopen(path, dlopen_flags);
+    }
+
+    if (handle == NULL) {
+        SDL_SetError("Could not load OpenGL ES/EGL library");
+        return -1;
+    }
+
+    /* Unload the old driver and reset the pointers */
+    X11_GLES_UnloadLibrary(_this);
+
+    /* Load new function pointers */
+    LOAD_FUNC(eglGetDisplay);
+    LOAD_FUNC(eglInitialize);
+    LOAD_FUNC(eglTerminate);
+    LOAD_FUNC(eglGetProcAddress);
+    LOAD_FUNC(eglChooseConfig);
+    LOAD_FUNC(eglGetConfigAttrib);
+    LOAD_FUNC(eglCreateContext);
+    LOAD_FUNC(eglDestroyContext);
+    LOAD_FUNC(eglCreateWindowSurface);
+    LOAD_FUNC(eglDestroySurface);
+    LOAD_FUNC(eglMakeCurrent);
+    LOAD_FUNC(eglSwapBuffers);
+
+    _this->gles_data->egl_display =
+        _this->gles_data->eglGetDisplay((NativeDisplayType) data->display);
+
+    if (!_this->gles_data->egl_display) {
+        SDL_SetError("Could not get EGL display");
+        return -1;
+    }
+
+    if (_this->gles_data->
+        eglInitialize(_this->gles_data->egl_display, NULL,
+                      NULL) != EGL_TRUE) {
+        SDL_SetError("Could not initialize EGL");
+        return -1;
+    }
+
+    _this->gl_config.dll_handle = handle;
+    _this->gl_config.driver_loaded = 1;
+
+    if (path) {
+        strncpy(_this->gl_config.driver_path, path,
+                sizeof(_this->gl_config.driver_path) - 1);
+    } else {
+        strcpy(_this->gl_config.driver_path, "");
+    }
+    return 0;
+}
+
+XVisualInfo *
+X11_GLES_GetVisual(_THIS, Display * display, int screen)
+{
+    /* 64 seems nice. */
+    EGLint attribs[64];
+    EGLint found_configs = 0;
+    VisualID visual_id;
+    int i;
+
+    /* load the gl driver from a default path */
+    if (!_this->gl_config.driver_loaded) {
+        /* no driver has been loaded, use default (ourselves) */
+        if (X11_GLES_LoadLibrary(_this, NULL) < 0) {
+            return NULL;
+        }
+    }
+
+    i = 0;
+    attribs[i++] = EGL_RED_SIZE;
+    attribs[i++] = _this->gl_config.red_size;
+    attribs[i++] = EGL_GREEN_SIZE;
+    attribs[i++] = _this->gl_config.green_size;
+    attribs[i++] = EGL_BLUE_SIZE;
+    attribs[i++] = _this->gl_config.blue_size;
+
+    if (_this->gl_config.alpha_size) {
+        attribs[i++] = EGL_ALPHA_SIZE;
+        attribs[i++] = _this->gl_config.alpha_size;
+    }
+
+    if (_this->gl_config.buffer_size) {
+        attribs[i++] = EGL_BUFFER_SIZE;
+        attribs[i++] = _this->gl_config.buffer_size;
+    }
+
+    attribs[i++] = EGL_DEPTH_SIZE;
+    attribs[i++] = _this->gl_config.depth_size;
+
+    if (_this->gl_config.stencil_size) {
+        attribs[i++] = EGL_STENCIL_SIZE;
+        attribs[i++] = _this->gl_config.stencil_size;
+    }
+
+    if (_this->gl_config.multisamplebuffers) {
+        attribs[i++] = EGL_SAMPLE_BUFFERS;
+        attribs[i++] = _this->gl_config.multisamplebuffers;
+    }
+
+    if (_this->gl_config.multisamplesamples) {
+        attribs[i++] = EGL_SAMPLES;
+        attribs[i++] = _this->gl_config.multisamplesamples;
+    }
+
+    attribs[i++] = EGL_NONE;
+
+    if (_this->gles_data->eglChooseConfig(_this->gles_data->egl_display,
+                                          attribs,
+                                          &_this->gles_data->egl_config, 1,
+                                          &found_configs) == EGL_FALSE ||
+        found_configs == 0) {
+        SDL_SetError("Couldn't find matching EGL config");
+        return NULL;
+    }
+
+    if (_this->gles_data->eglGetConfigAttrib(_this->gles_data->egl_display,
+                                             _this->gles_data->egl_config,
+                                             EGL_NATIVE_VISUAL_ID,
+                                             (EGLint *) & visual_id) ==
+        EGL_FALSE || !visual_id) {
+        /* Use the default visual when all else fails */
+        XVisualInfo vi_in;
+        int out_count;
+        vi_in.screen = screen;
+
+        _this->gles_data->egl_visualinfo = XGetVisualInfo(display,
+                                                          VisualScreenMask,
+                                                          &vi_in, &out_count);
+    } else {
+        XVisualInfo vi_in;
+        int out_count;
+
+        vi_in.screen = screen;
+        vi_in.visualid = visual_id;
+        _this->gles_data->egl_visualinfo = XGetVisualInfo(display,
+                                                          VisualScreenMask |
+                                                          VisualIDMask,
+                                                          &vi_in, &out_count);
+    }
+
+    return _this->gles_data->egl_visualinfo;
+}
+
+SDL_GLContext
+X11_GLES_CreateContext(_THIS, SDL_Window * window)
+{
+    int retval;
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+    Display *display = data->videodata->display;
+
+    XSync(display, False);
+
+
+    _this->gles_data->egl_context =
+        _this->gles_data->eglCreateContext(_this->gles_data->egl_display,
+                                           _this->gles_data->egl_config,
+                                           EGL_NO_CONTEXT, NULL);
+    XSync(display, False);
+
+    if (_this->gles_data->egl_context == EGL_NO_CONTEXT) {
+        SDL_SetError("Could not create EGL context");
+        return NULL;
+    }
+
+    _this->gles_data->egl_active = 1;
+
+    if (_this->gles_data->egl_active)
+        retval = 1;
+    else
+        retval = 0;
+
+    return (retval);
+}
+
+int
+X11_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
+{
+    int retval;
+
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+    Display *display = data->videodata->display;
+
+    retval = 1;
+    if (!_this->gles_data->eglMakeCurrent(_this->gles_data->egl_display,
+                                          _this->gles_data->egl_surface,
+                                          _this->gles_data->egl_surface,
+                                          _this->gles_data->egl_context)) {
+        SDL_SetError("Unable to make EGL context current");
+        retval = -1;
+    }
+    XSync(display, False);
+
+    return (retval);
+}
+
+static int swapinterval = -1;
+int
+X11_GLES_SetSwapInterval(_THIS, int interval)
+{
+    return 0;
+}
+
+int
+X11_GLES_GetSwapInterval(_THIS)
+{
+    return 0;
+}
+
+void
+X11_GLES_SwapWindow(_THIS, SDL_Window * window)
+{
+    _this->gles_data->eglSwapBuffers(_this->gles_data->egl_display,
+                                     _this->gles_data->egl_surface);
+}
+
+void
+X11_GLES_DeleteContext(_THIS, SDL_GLContext context)
+{
+    /* Clean up GLES and EGL */
+    if (_this->gles_data->egl_context != EGL_NO_CONTEXT ||
+        _this->gles_data->egl_surface != EGL_NO_SURFACE) {
+        _this->gles_data->eglMakeCurrent(_this->gles_data->egl_display,
+                                         EGL_NO_SURFACE, EGL_NO_SURFACE,
+                                         EGL_NO_CONTEXT);
+
+        if (_this->gles_data->egl_context != EGL_NO_CONTEXT) {
+            _this->gles_data->eglDestroyContext(_this->gles_data->egl_display,
+                                                _this->gles_data->
+                                                egl_context);
+            _this->gles_data->egl_context = EGL_NO_CONTEXT;
+        }
+
+        if (_this->gles_data->egl_surface != EGL_NO_SURFACE) {
+            _this->gles_data->eglDestroySurface(_this->gles_data->egl_display,
+                                                _this->gles_data->
+                                                egl_surface);
+            _this->gles_data->egl_surface = EGL_NO_SURFACE;
+        }
+    }
+    _this->gles_data->egl_active = 0;
+}
+
+#endif /* SDL_VIDEO_OPENGL_ES */
+
+/* vi: set ts=4 sw=4 expandtab: */