/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2010 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

*/

#include "SDL_config.h"

#include "SDL_DirectFB_video.h"

#if SDL_DIRECTFB_OPENGL

struct SDL_GLDriverData

};

#define OPENGL_REQUIRS_DLOPEN

#if defined(OPENGL_REQUIRS_DLOPEN) && defined(SDL_LOADSO_DLOPEN)

#include <dlfcn.h>

#define GL_LoadObject(X) dlopen(X, (RTLD_NOW|RTLD_GLOBAL))

#define GL_LoadFunction dlsym

#define GL_UnloadObject dlclose

#else

#define GL_LoadObject SDL_LoadObject

#define GL_LoadFunction SDL_LoadFunction

#define GL_UnloadObject SDL_UnloadObject

#endif

static void DirectFB_GL_UnloadLibrary(_THIS);

int

DirectFB_GL_Initialize(_THIS)

{

if (_this->gl_data) {

return 0;

}

_this->gl_data =

(struct SDL_GLDriverData *) SDL_calloc(1,

sizeof(struct

SDL_GLDriverData));

if (!_this->gl_data) {

SDL_OutOfMemory();

return -1;

}

_this->gl_data->initialized = 0;

++_this->gl_data->initialized;

_this->gl_data->firstgl = NULL;

if (DirectFB_GL_LoadLibrary(_this, NULL) < 0) {

return -1;

}

/* Initialize extensions */

/* FIXME needed?

* X11_GL_InitExtensions(_this);

*/

return 0;

}

void

DirectFB_GL_Shutdown(_THIS)

{

if (!_this->gl_data || (--_this->gl_data->initialized > 0)) {

return;

}

DirectFB_GL_UnloadLibrary(_this);

SDL_free(_this->gl_data);

_this->gl_data = NULL;

}

int

DirectFB_GL_LoadLibrary(_THIS, const char *path)

{

SDL_DFB_DEVICEDATA(_this);

void *handle = NULL;

SDL_DFB_DEBUG("Loadlibrary : %s\n", path);

if (_this->gl_data->gl_active) {

SDL_SetError("OpenGL context already created");

return -1;

}

if (path == NULL) {

path = SDL_getenv("SDL_VIDEO_GL_DRIVER");

if (path == NULL) {

path = "libGL.so";

}

}

handle = GL_LoadObject(path);

if (handle == NULL) {

SDL_DFB_ERR("Library not found: %s\n", path);

/* SDL_LoadObject() will call SDL_SetError() for us. */

return -1;

}

SDL_DFB_DEBUG("Loaded library: %s\n", path);

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

DirectFB_GL_UnloadLibrary(_this);

_this->gl_config.dll_handle = handle;

_this->gl_config.driver_loaded = 1;

if (path) {

SDL_strlcpy(_this->gl_config.driver_path, path,

SDL_arraysize(_this->gl_config.driver_path));

} else {

*_this->gl_config.driver_path = '\0';

}

devdata->glFinish = DirectFB_GL_GetProcAddress(_this, "glFinish");

devdata->glFlush = DirectFB_GL_GetProcAddress(_this, "glFlush");

return 0;

}

static void

DirectFB_GL_UnloadLibrary(_THIS)

{

int ret;

if (_this->gl_config.driver_loaded) {

ret = GL_UnloadObject(_this->gl_config.dll_handle);

if (ret)

SDL_DFB_ERR("Error #%d trying to unload library.\n", ret);

_this->gl_config.dll_handle = NULL;

_this->gl_config.driver_loaded = 0;

}

}

void *

DirectFB_GL_GetProcAddress(_THIS, const char *proc)

{

void *handle;

handle = _this->gl_config.dll_handle;

return GL_LoadFunction(handle, proc);

}

SDL_GLContext

DirectFB_GL_CreateContext(_THIS, SDL_Window * window)

{

SDL_DFB_WINDOWDATA(window);

DirectFB_GLContext *context;

int ret;

SDL_DFB_CALLOC(context, 1, sizeof(*context));

SDL_DFB_CHECKERR(windata->surface->GetGL(windata->surface,

&context->context));

if (!context->context)

return NULL;

SDL_DFB_CHECKERR(context->context->Unlock(context->context));

context->next = _this->gl_data->firstgl;

_this->gl_data->firstgl = context;

if (DirectFB_GL_MakeCurrent(_this, window, context) < 0) {

DirectFB_GL_DeleteContext(_this, context);

return NULL;

}

return context;

error:

return NULL;

}

int

DirectFB_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)

{

SDL_DFB_WINDOWDATA(window);

DirectFB_GLContext *ctx = (DirectFB_GLContext *) context;

DirectFB_GLContext *p;

int ret;

for (p = _this->gl_data->firstgl; p; p = p->next)

p->context->Unlock(p->context);

if (windata) {

windata->gl_context = NULL;

/* Everything is unlocked, check for a resize */

DirectFB_AdjustWindowSurface(window);

}

if (ctx != NULL) {

SDL_DFB_CHECKERR(ctx->context->Lock(ctx->context));

}

if (windata)

windata->gl_context = ctx;

return 0;

error:

return -1;

}

int

DirectFB_GL_SetSwapInterval(_THIS, int interval)

{

SDL_Unsupported();

return -1;

}

int

DirectFB_GL_GetSwapInterval(_THIS)

{

SDL_Unsupported();

return -1;

}

void

DirectFB_GL_SwapWindow(_THIS, SDL_Window * window)

{

SDL_DFB_DEVICEDATA(_this);

SDL_DFB_WINDOWDATA(window);

int ret;

DFBRegion region;

region.x1 = 0;

region.y1 = 0;

region.x2 = window->w;

region.y2 = window->h;

if (devdata->glFinish)

devdata->glFinish();

else if (devdata->glFlush)

devdata->glFlush();

if (1 || windata->gl_context) {

/* SDL_DFB_CHECKERR(windata->gl_context->context->Unlock(windata->gl_context->context)); */

SDL_DFB_CHECKERR(windata->surface->Flip(windata->surface, &region,

DSFLIP_ONSYNC));

/* SDL_DFB_CHECKERR(windata->gl_context->context->Lock(windata->gl_context->context)); */

}

return;

error:

return;

}

void

DirectFB_GL_DeleteContext(_THIS, SDL_GLContext context)

{

DirectFB_GLContext *ctx = (DirectFB_GLContext *) context;

DirectFB_GLContext *p;

ctx->context->Unlock(ctx->context);

ctx->context->Release(ctx->context);

p = _this->gl_data->firstgl;

while (p && p->next != ctx)

p = p->next;

if (p)

p->next = ctx->next;

else

_this->gl_data->firstgl = ctx->next;

SDL_DFB_FREE(ctx);

}

#endif

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