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SDL_x11gl.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
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slouken@libsdl.org
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*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
#include <stdlib.h> /* For getenv() prototype */
#include <string.h>
#include "SDL_events_c.h"
#include "SDL_error.h"
#include "SDL_x11video.h"
#include "SDL_x11dga_c.h"
#include "SDL_x11gl_c.h"
#define DEFAULT_OPENGL "libGL.so.1"
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#ifndef GLX_ARB_multisample
#define GLX_ARB_multisample
#define GLX_SAMPLE_BUFFERS_ARB 100000
#define GLX_SAMPLES_ARB 100001
#endif
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/* return the preferred visual to use for openGL graphics */
XVisualInfo *X11_GL_GetVisual(_THIS)
{
#ifdef HAVE_OPENGL
/* 64 seems nice. */
int attribs[64];
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_GL_LoadLibrary(this, NULL) < 0 ) {
return NULL;
}
}
/* See if we already have a window which we must use */
if ( SDL_windowid ) {
XWindowAttributes a;
XVisualInfo vi_in;
int out_count;
XGetWindowAttributes(SDL_Display, SDL_Window, &a);
vi_in.screen = SDL_Screen;
vi_in.visualid = XVisualIDFromVisual(a.visual);
glx_visualinfo = XGetVisualInfo(SDL_Display,
VisualScreenMask|VisualIDMask, &vi_in, &out_count);
return glx_visualinfo;
}
/* Setup our GLX attributes according to the gl_config. */
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i = 0;
attribs[i++] = GLX_RGBA;
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attribs[i++] = GLX_RED_SIZE;
attribs[i++] = this->gl_config.red_size;
attribs[i++] = GLX_GREEN_SIZE;
attribs[i++] = this->gl_config.green_size;
attribs[i++] = GLX_BLUE_SIZE;
attribs[i++] = this->gl_config.blue_size;
if( this->gl_config.alpha_size ) {
attribs[i++] = GLX_ALPHA_SIZE;
attribs[i++] = this->gl_config.alpha_size;
}
if( this->gl_config.buffer_size ) {
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attribs[i++] = GLX_BUFFER_SIZE;
attribs[i++] = this->gl_config.buffer_size;
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}
if( this->gl_config.double_buffer ) {
attribs[i++] = GLX_DOUBLEBUFFER;
}
attribs[i++] = GLX_DEPTH_SIZE;
attribs[i++] = this->gl_config.depth_size;
if( this->gl_config.stencil_size ) {
attribs[i++] = GLX_STENCIL_SIZE;
attribs[i++] = this->gl_config.stencil_size;
}
if( this->gl_config.accum_red_size ) {
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attribs[i++] = GLX_ACCUM_RED_SIZE;
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attribs[i++] = this->gl_config.accum_red_size;
}
if( this->gl_config.accum_green_size ) {
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attribs[i++] = GLX_ACCUM_GREEN_SIZE;
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attribs[i++] = this->gl_config.accum_green_size;
}
if( this->gl_config.accum_blue_size ) {
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attribs[i++] = GLX_ACCUM_BLUE_SIZE;
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attribs[i++] = this->gl_config.accum_blue_size;
}
if( this->gl_config.accum_alpha_size ) {
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attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
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attribs[i++] = this->gl_config.accum_alpha_size;
}
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if( this->gl_config.stereo ) {
attribs[i++] = GLX_STEREO;
attribs[i++] = this->gl_config.stereo;
}
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if( this->gl_config.multisamplebuffers ) {
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attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
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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++] = GLX_SAMPLES_ARB;
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attribs[i++] = this->gl_config.multisamplesamples;
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}
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#ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */
attribs[i++] = GLX_X_VISUAL_TYPE;
attribs[i++] = GLX_DIRECT_COLOR;
#endif
attribs[i++] = None;
glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
SDL_Screen, attribs);
#ifdef GLX_DIRECT_COLOR
if( !glx_visualinfo ) { /* No DirectColor visual? Try again.. */
attribs[i-3] = None;
glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
SDL_Screen, attribs);
}
#endif
if( !glx_visualinfo ) {
SDL_SetError( "Couldn't find matching GLX visual");
return NULL;
}
return glx_visualinfo;
#else
SDL_SetError("X11 driver not configured with OpenGL");
return NULL;
#endif
}
int X11_GL_CreateWindow(_THIS, int w, int h)
{
int retval;
#ifdef HAVE_OPENGL
XSetWindowAttributes attributes;
unsigned long mask;
unsigned long black;
black = (glx_visualinfo->visual == DefaultVisual(SDL_Display,
SDL_Screen))
? BlackPixel(SDL_Display, SDL_Screen) : 0;
attributes.background_pixel = black;
attributes.border_pixel = black;
attributes.colormap = SDL_XColorMap;
mask = CWBackPixel | CWBorderPixel | CWColormap;
SDL_Window = XCreateWindow(SDL_Display, WMwindow,
0, 0, w, h, 0, glx_visualinfo->depth,
InputOutput, glx_visualinfo->visual,
mask, &attributes);
if ( !SDL_Window ) {
SDL_SetError("Could not create window");
return -1;
}
retval = 0;
#else
SDL_SetError("X11 driver not configured with OpenGL");
retval = -1;
#endif
return(retval);
}
int X11_GL_CreateContext(_THIS)
{
int retval;
#ifdef HAVE_OPENGL
/* We do this to create a clean separation between X and GLX errors. */
XSync( SDL_Display, False );
glx_context = this->gl_data->glXCreateContext(GFX_Display,
glx_visualinfo, NULL, True);
XSync( GFX_Display, False );
if (glx_context == NULL) {
SDL_SetError("Could not create GL context");
return -1;
}
gl_active = 1;
#else
SDL_SetError("X11 driver not configured with OpenGL");
#endif
if ( gl_active ) {
retval = 0;
} else {
retval = -1;
}
return(retval);
}
void X11_GL_Shutdown(_THIS)
{
#ifdef HAVE_OPENGL
/* Clean up OpenGL */
if( glx_context ) {
this->gl_data->glXMakeCurrent(GFX_Display, None, NULL);
if (glx_context != NULL)
this->gl_data->glXDestroyContext(GFX_Display, glx_context);
if( this->gl_data->glXReleaseBuffersMESA ) {
this->gl_data->glXReleaseBuffersMESA(GFX_Display,SDL_Window);
}
glx_context = NULL;
}
gl_active = 0;
#endif /* HAVE_OPENGL */
}
#ifdef HAVE_OPENGL
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static int ExtensionSupported(const char *extension)
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{
const GLubyte *extensions = NULL;
const GLubyte *start;
GLubyte *where, *terminator;
/* Extension names should not have spaces. */
where = (GLubyte *) strchr(extension, ' ');
if (where || *extension == '\0')
return 0;
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extensions = current_video->glGetString(GL_EXTENSIONS);
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/* It takes a bit of care to be fool-proof about parsing the
* OpenGL extensions string. Don't be fooled by sub-strings,
* etc. */
start = extensions;
for (;;)
{
where = (GLubyte *) strstr((const char *) start, extension);
if (!where) break;
terminator = where + strlen(extension);
if (where == start || *(where - 1) == ' ')
if (*terminator == ' ' || *terminator == '\0') return 1;
start = terminator;
}
return 0;
}
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/* Make the current context active */
int X11_GL_MakeCurrent(_THIS)
{
int retval;
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retval = 0;
if ( ! this->gl_data->glXMakeCurrent(GFX_Display,
SDL_Window, glx_context) ) {
SDL_SetError("Unable to make GL context current");
retval = -1;
}
XSync( GFX_Display, False );
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/*
* The context is now current, check for glXReleaseBuffersMESA()
* extension. If extension is _not_ supported, destroy the pointer
* (to make sure it will not be called in X11_GL_Shutdown() ).
*
* DRI/Mesa drivers include glXReleaseBuffersMESA() in the libGL.so,
* but there's no need to call it (is is only needed for some old
* non-DRI drivers).
*
* When using for example glew (http://glew.sf.net), dlsym() for
* glXReleaseBuffersMESA() returns the pointer from the glew library
* (namespace conflict).
*
* The glXReleaseBuffersMESA() pointer in the glew is NULL, if the
* driver doesn't support this extension. So blindly calling it will
* cause segfault with DRI/Mesa drivers!
*
*/
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if ( ! ExtensionSupported("glXReleaseBuffersMESA") ) {
this->gl_data->glXReleaseBuffersMESA = NULL;
}
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/* More Voodoo X server workarounds... Grr... */
SDL_Lock_EventThread();
X11_CheckDGAMouse(this);
SDL_Unlock_EventThread();
return(retval);
}
/* Get attribute data from glX. */
int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
{
int retval;
int glx_attrib = None;
switch( attrib ) {
case SDL_GL_RED_SIZE:
glx_attrib = GLX_RED_SIZE;
break;
case SDL_GL_GREEN_SIZE:
glx_attrib = GLX_GREEN_SIZE;
break;
case SDL_GL_BLUE_SIZE:
glx_attrib = GLX_BLUE_SIZE;
break;
case SDL_GL_ALPHA_SIZE:
glx_attrib = GLX_ALPHA_SIZE;
break;
case SDL_GL_DOUBLEBUFFER:
glx_attrib = GLX_DOUBLEBUFFER;
break;
case SDL_GL_BUFFER_SIZE:
glx_attrib = GLX_BUFFER_SIZE;
break;
case SDL_GL_DEPTH_SIZE:
glx_attrib = GLX_DEPTH_SIZE;
break;
case SDL_GL_STENCIL_SIZE:
glx_attrib = GLX_STENCIL_SIZE;
break;
case SDL_GL_ACCUM_RED_SIZE:
glx_attrib = GLX_ACCUM_RED_SIZE;
break;
case SDL_GL_ACCUM_GREEN_SIZE:
glx_attrib = GLX_ACCUM_GREEN_SIZE;
break;
case SDL_GL_ACCUM_BLUE_SIZE:
glx_attrib = GLX_ACCUM_BLUE_SIZE;
break;
case SDL_GL_ACCUM_ALPHA_SIZE:
glx_attrib = GLX_ACCUM_ALPHA_SIZE;
break;
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case SDL_GL_STEREO:
glx_attrib = GLX_STEREO;
break;
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case SDL_GL_MULTISAMPLEBUFFERS:
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glx_attrib = GLX_SAMPLE_BUFFERS_ARB;
break;
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case SDL_GL_MULTISAMPLESAMPLES:
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glx_attrib = GLX_SAMPLES_ARB;
break;
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default:
return(-1);
}
retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
return retval;
}
void X11_GL_SwapBuffers(_THIS)
{
this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window);
}
#endif /* HAVE_OPENGL */
void X11_GL_UnloadLibrary(_THIS)
{
#ifdef HAVE_OPENGL
if ( this->gl_config.driver_loaded ) {
dlclose(this->gl_config.dll_handle);
this->gl_data->glXGetProcAddress = NULL;
this->gl_data->glXChooseVisual = NULL;
this->gl_data->glXCreateContext = NULL;
this->gl_data->glXDestroyContext = NULL;
this->gl_data->glXMakeCurrent = NULL;
this->gl_data->glXSwapBuffers = NULL;
this->gl_config.dll_handle = NULL;
this->gl_config.driver_loaded = 0;
}
#endif
}
#ifdef HAVE_OPENGL
/* Passing a NULL path means load pointers from the application */
int X11_GL_LoadLibrary(_THIS, const char* path)
{
void* handle;
int dlopen_flags;
if ( gl_active ) {
SDL_SetError("OpenGL 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 GL */
if ( (dlsym(handle, "glXChooseVisual") == 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 library");
return -1;
}
/* Unload the old driver and reset the pointers */
X11_GL_UnloadLibrary(this);
/* Load new function pointers */
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this->gl_data->glXGetProcAddress =
(void *(*)(const GLubyte *)) dlsym(handle, "glXGetProcAddressARB");
this->gl_data->glXChooseVisual =
(XVisualInfo *(*)(Display *, int, int *)) dlsym(handle, "glXChooseVisual");
this->gl_data->glXCreateContext =
(GLXContext (*)(Display *, XVisualInfo *, GLXContext, int)) dlsym(handle, "glXCreateContext");
this->gl_data->glXDestroyContext =
(void (*)(Display *, GLXContext)) dlsym(handle, "glXDestroyContext");
this->gl_data->glXMakeCurrent =
(int (*)(Display *, GLXDrawable, GLXContext)) dlsym(handle, "glXMakeCurrent");
this->gl_data->glXSwapBuffers =
(void (*)(Display *, GLXDrawable)) dlsym(handle, "glXSwapBuffers");
this->gl_data->glXGetConfig =
(int (*)(Display *, XVisualInfo *, int, int *)) dlsym(handle, "glXGetConfig");
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this->gl_data->glXQueryExtensionsString =
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(const char *(*)(Display *, int)) dlsym(handle, "glXQueryExtensionsString");
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/* We don't compare below for this in case we're not using Mesa. */
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this->gl_data->glXReleaseBuffersMESA =
(void (*)(Display *, GLXDrawable)) dlsym( handle, "glXReleaseBuffersMESA" );
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if ( (this->gl_data->glXChooseVisual == NULL) ||
(this->gl_data->glXCreateContext == NULL) ||
(this->gl_data->glXDestroyContext == NULL) ||
(this->gl_data->glXMakeCurrent == NULL) ||
(this->gl_data->glXSwapBuffers == NULL) ||
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(this->gl_data->glXGetConfig == NULL) ||
(this->gl_data->glXQueryExtensionsString == NULL)) {
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SDL_SetError("Could not retrieve OpenGL functions");
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;
}
void *X11_GL_GetProcAddress(_THIS, const char* proc)
{
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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;
if ( this->gl_data->glXGetProcAddress ) {
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return this->gl_data->glXGetProcAddress(proc);
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}
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#if defined(__OpenBSD__) && !defined(__ELF__)
#undef dlsym(x,y);
#endif
retval = dlsym(handle, proc);
if (!retval && strlen(proc) <= 1022) {
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procname[0] = '_';
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strcpy(procname + 1, proc);
retval = dlsym(handle, procname);
}
return retval;
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}
#endif /* HAVE_OPENGL */