/*

* Simple DirectMedia Layer

* Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>

*

* This software is provided 'as-is', without any express or implied

* warranty. In no event will the authors be held liable for any damages

* arising from the use of this software.

*

* Permission is granted to anyone to use this software for any purpose,

* including commercial applications, and to alter it and redistribute it

* freely, subject to the following restrictions:

*

* 1. The origin of this software must not be misrepresented; you must not

* claim that you wrote the original software. If you use this software

* in a product, an acknowledgment in the product documentation would be

* appreciated but is not required.

* 2. Altered source versions must be plainly marked as such, and must not be

* misrepresented as being the original software.

* 3. This notice may not be removed or altered from any source distribution.

*/

#include "SDL_config.h"

#if SDL_VIDEO_OPENGL_EGL

#include "SDL_sysvideo.h"

#include "SDL_egl.h"

#define DEFAULT_EGL "libEGL.so"

#define DEFAULT_OGL_ES2 "libGLESv2.so"

#define DEFAULT_OGL_ES_PVR "libGLES_CM.so"

#define DEFAULT_OGL_ES "libGLESv1_CM.so"

#define LOAD_FUNC(NAME) \

*((void**)&_this->egl_data->NAME) = dlsym(handle, #NAME); \

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

{ \

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

}

/* EGL implementation of SDL OpenGL ES support */

void *

SDL_EGL_GetProcAddress(_THIS, const char *proc)

{

static char procname[1024];

void *handle;

void *retval;

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

#if !defined(SDL_VIDEO_DRIVER_ANDROID)

handle = _this->egl_data->egl_dll_handle;

if (_this->egl_data->eglGetProcAddress) {

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

if (retval) {

return retval;

}

}

#endif

handle = _this->gl_config.dll_handle;

#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

SDL_EGL_UnloadLibrary(_THIS)

{

if ((_this->egl_data) && (_this->gl_config.driver_loaded)) {

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

dlclose(_this->gl_config.dll_handle);

dlclose(_this->egl_data->egl_dll_handle);

SDL_free(_this->egl_data);

_this->egl_data = NULL;

_this->gl_config.dll_handle = NULL;

_this->gl_config.driver_loaded = 0;

}

}

int

SDL_EGL_LoadLibrary(_THIS, const char *path, NativeDisplayType native_display)

{

void *handle;

int dlopen_flags;

if (_this->egl_data) {

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

}

/* Unload the old driver and reset the pointers */

SDL_EGL_UnloadLibrary(_this);

#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_EGL_DRIVER");

if (path == NULL) {

path = DEFAULT_EGL;

}

handle = dlopen(path, dlopen_flags);

}

if (handle == NULL) {

return SDL_SetError("Could not load OpenGL ES/EGL library");

}

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

if (!_this->egl_data) {

return SDL_OutOfMemory();

}

/* 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);

LOAD_FUNC(eglSwapInterval);

LOAD_FUNC(eglWaitNative);

LOAD_FUNC(eglWaitGL);

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

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

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

}

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

return SDL_SetError("Could not initialize EGL");

}

_this->egl_data->egl_dll_handle = handle;

path = getenv("SDL_VIDEO_GL_DRIVER");

handle = dlopen(path, dlopen_flags);

if ((path == NULL) | (handle == NULL)) {

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

path = DEFAULT_OGL_ES2;

handle = dlopen(path, dlopen_flags);

} else {

path = DEFAULT_OGL_ES;

handle = dlopen(path, dlopen_flags);

if (handle == NULL) {

path = DEFAULT_OGL_ES_PVR;

handle = dlopen(path, dlopen_flags);

}

}

}

if (handle == NULL) {

return SDL_SetError("Could not initialize OpenGL ES library");

}

_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, "");

}

/* We need to select a config here to satisfy some video backends such as X11 */

SDL_EGL_ChooseConfig(_this);

return 0;

}

int

SDL_EGL_ChooseConfig(_THIS)

{

/* 64 seems nice. */

EGLint attribs[64];

EGLint found_configs = 0;

int i;

if (!_this->egl_data) {

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

return -1;

}

/* Get a valid EGL configuration */

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_RENDERABLE_TYPE;

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

attribs[i++] = EGL_OPENGL_ES2_BIT;

} else {

attribs[i++] = EGL_OPENGL_ES_BIT;

}

attribs[i++] = EGL_NONE;

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

attribs,

&_this->egl_data->egl_config, 1,

&found_configs) == EGL_FALSE ||

found_configs == 0) {

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

}

return 0;

}

SDL_GLContext

SDL_EGL_CreateContext(_THIS, EGLSurface egl_surface)

{

EGLint context_attrib_list[] = {

EGL_CONTEXT_CLIENT_VERSION,

1,

EGL_NONE

};

EGLContext egl_context;

if (!_this->egl_data) {

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

return NULL;

}

if (_this->gl_config.major_version) {

context_attrib_list[1] = _this->gl_config.major_version;

}

egl_context =

_this->egl_data->eglCreateContext(_this->egl_data->egl_display,

_this->egl_data->egl_config,

EGL_NO_CONTEXT, context_attrib_list);

if (egl_context == EGL_NO_CONTEXT) {

SDL_SetError("Could not create EGL context");

return NULL;

}

_this->egl_data->egl_swapinterval = 0;

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

SDL_EGL_DeleteContext(_this, egl_context);

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

return NULL;

}

return (SDL_GLContext) egl_context;

}

int

SDL_EGL_MakeCurrent(_THIS, EGLSurface egl_surface, SDL_GLContext context)

{

EGLContext egl_context = (EGLContext) context;

if (!_this->egl_data) {

return SDL_SetError("OpenGL not initialized");

}

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

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

*/

if (!egl_context || !egl_surface) {

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

}

else {

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

egl_surface, egl_surface, egl_context)) {

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

}

}

return 0;

}

int

SDL_EGL_SetSwapInterval(_THIS, int interval)

{

EGLBoolean status;

if (!_this->egl_data) {

return SDL_SetError("EGL not initialized");

}

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

if (status == EGL_TRUE) {

_this->egl_data->egl_swapinterval = interval;

return 0;

}

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

}

int

SDL_EGL_GetSwapInterval(_THIS)

{

if (!_this->egl_data) {

return SDL_SetError("EGL not initialized");

}

return _this->egl_data->egl_swapinterval;

}

void

SDL_EGL_SwapBuffers(_THIS, EGLSurface egl_surface)

{

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

}

void

SDL_EGL_DeleteContext(_THIS, SDL_GLContext context)

{

EGLContext egl_context = (EGLContext) context;

/* Clean up GLES and EGL */

if (!_this->egl_data) {

return;

}

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

SDL_EGL_MakeCurrent(_this, NULL, NULL);

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

}

/* FIXME: This "crappy fix" comes from the X11 code,

* it's required so you can create a GLX context, destroy it and create a EGL one */

SDL_EGL_UnloadLibrary(_this);

}

EGLSurface *

SDL_EGL_CreateSurface(_THIS, NativeWindowType nw)

{

return _this->egl_data->eglCreateWindowSurface(

_this->egl_data->egl_display,

_this->egl_data->egl_config,

nw, NULL);

}

void

SDL_EGL_DestroySurface(_THIS, EGLSurface egl_surface)

{

if (!_this->egl_data) {

return;

}

if (egl_surface != EGL_NO_SURFACE) {

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

}

}

#endif /* SDL_VIDEO_OPENGL_EGL */

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