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SDL_x11opengles.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2010 Sam Lantinga
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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
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License along with this library; if not, write to the Free Software
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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;
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// SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
// Display *display = data->videodata->display;
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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;
}
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// XSync(display, False);
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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;
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/* crappy fix */
X11_GLES_UnloadLibrary(_this);
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}
#endif /* SDL_VIDEO_OPENGL_ES */
/* vi: set ts=4 sw=4 expandtab: */