SDL_x11gl.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include "SDL_x11video.h"
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#include "../../events/SDL_events_c.h"
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#include "SDL_x11dga_c.h"
#include "SDL_x11gl_c.h"
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#if defined(__IRIX__)
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/* IRIX doesn't have a GL library versioning system */
#define DEFAULT_OPENGL "libGL.so"
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#elif defined(__MACOSX__)
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#define DEFAULT_OPENGL "/usr/X11R6/lib/libGL.1.dylib"
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#elif defined(__QNXNTO__)
#define DEFAULT_OPENGL "libGL.so.3"
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#elif defined(__OpenBSD__)
#define DEFAULT_OPENGL "libGL.so.4.0"
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#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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#ifndef GLX_EXT_visual_rating
#define GLX_EXT_visual_rating
#define GLX_VISUAL_CAVEAT_EXT 0x20
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#define GLX_NONE_EXT 0x8000
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#define GLX_SLOW_VISUAL_EXT 0x8001
#define GLX_NON_CONFORMANT_VISUAL_EXT 0x800D
#endif
#if SDL_VIDEO_OPENGL_GLX
static int glXExtensionSupported(_THIS, const char *extension)
{
const char *extensions;
const char *start;
const char *where, *terminator;
/* Extension names should not have spaces. */
where = SDL_strchr(extension, ' ');
if ( where || *extension == '\0' ) {
return 0;
}
extensions = this->gl_data->glXQueryExtensionsString(GFX_Display,SDL_Screen);
/* 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 = SDL_strstr(start, extension);
if (!where) break;
terminator = where + strlen(extension);
if (where == start || *(where - 1) == ' ')
if (*terminator == ' ' || *terminator == '\0') return 1;
start = terminator;
}
return 0;
}
#endif /* SDL_VIDEO_OPENGL_GLX */
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XVisualInfo *X11_GL_GetVisual(_THIS)
{
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#if SDL_VIDEO_OPENGL_GLX
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/* 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;
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XGetWindowAttributes(SDL_Display, SDL_Window, &a);
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vi_in.screen = SDL_Screen;
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vi_in.visualid = XVisualIDFromVisual(a.visual);
glx_visualinfo = XGetVisualInfo(SDL_Display,
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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;
}
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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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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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if( this->gl_config.accelerated >= 0 &&
glXExtensionSupported(this, "GLX_EXT_visual_rating") ) {
attribs[i++] = GLX_VISUAL_CAVEAT_EXT;
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attribs[i++] = GLX_NONE_EXT;
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}
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#ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */
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if ( !SDL_getenv("SDL_VIDEO_X11_NODIRECTCOLOR") ) {
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attribs[i++] = GLX_X_VISUAL_TYPE;
attribs[i++] = GLX_DIRECT_COLOR;
}
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#endif
attribs[i++] = None;
glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
SDL_Screen, attribs);
#ifdef GLX_DIRECT_COLOR
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if( !glx_visualinfo && !SDL_getenv("SDL_VIDEO_X11_NODIRECTCOLOR") ) { /* No DirectColor visual? Try again.. */
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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;
}
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/*
printf("Found GLX visual 0x%x\n", glx_visualinfo->visualid);
*/
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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;
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#if SDL_VIDEO_OPENGL_GLX
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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;
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SDL_Window = XCreateWindow(SDL_Display, WMwindow,
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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;
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#if SDL_VIDEO_OPENGL_GLX
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/* We do this to create a clean separation between X and GLX errors. */
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XSync( SDL_Display, False );
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glx_context = this->gl_data->glXCreateContext(GFX_Display,
glx_visualinfo, NULL, True);
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XSync( GFX_Display, False );
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if ( glx_context == NULL ) {
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SDL_SetError("Could not create GL context");
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return(-1);
}
if ( X11_GL_MakeCurrent(this) < 0 ) {
return(-1);
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}
gl_active = 1;
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if ( !glXExtensionSupported(this, "GLX_SGI_swap_control") ) {
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this->gl_data->glXSwapIntervalSGI = NULL;
}
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if ( !glXExtensionSupported(this, "GLX_MESA_swap_control") ) {
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this->gl_data->glXSwapIntervalMESA = NULL;
this->gl_data->glXGetSwapIntervalMESA = NULL;
}
if ( this->gl_config.swap_control >= 0 ) {
if ( this->gl_data->glXSwapIntervalMESA ) {
this->gl_data->glXSwapIntervalMESA(this->gl_config.swap_control);
} else if ( this->gl_data->glXSwapIntervalSGI ) {
this->gl_data->glXSwapIntervalSGI(this->gl_config.swap_control);
}
}
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#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)
{
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#if SDL_VIDEO_OPENGL_GLX
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/* 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);
glx_context = NULL;
}
gl_active = 0;
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#endif /* SDL_VIDEO_OPENGL_GLX */
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}
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#if SDL_VIDEO_OPENGL_GLX
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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;
}
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XSync( GFX_Display, False );
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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)
{
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int retval = -1;
int unsupported = 0;
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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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case SDL_GL_ACCELERATED_VISUAL:
if ( glXExtensionSupported(this, "GLX_EXT_visual_rating") ) {
glx_attrib = GLX_VISUAL_CAVEAT_EXT;
retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
if ( *value == GLX_SLOW_VISUAL_EXT ) {
*value = SDL_FALSE;
} else {
*value = SDL_TRUE;
}
return retval;
} else {
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unsupported = 1;
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}
break;
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case SDL_GL_SWAP_CONTROL:
if ( this->gl_data->glXGetSwapIntervalMESA ) {
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} else {
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unsupported = 1;
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}
break;
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default:
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unsupported = 1;
break;
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}
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if (unsupported) {
SDL_SetError("OpenGL attribute is unsupported on this system");
} else {
retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
}
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return retval;
}
void X11_GL_SwapBuffers(_THIS)
{
this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window);
}
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#endif /* SDL_VIDEO_OPENGL_GLX */
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#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
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void X11_GL_UnloadLibrary(_THIS)
{
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#if SDL_VIDEO_OPENGL_GLX
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if ( this->gl_config.driver_loaded ) {
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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;
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this->gl_data->glXSwapIntervalSGI = NULL;
this->gl_data->glXSwapIntervalMESA = NULL;
this->gl_data->glXGetSwapIntervalMESA = NULL;
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this->gl_config.dll_handle = NULL;
this->gl_config.driver_loaded = 0;
}
#endif
}
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#if SDL_VIDEO_OPENGL_GLX
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/* Passing a NULL path means load pointers from the application */
int X11_GL_LoadLibrary(_THIS, const char* path)
{
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void* handle = NULL;
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if ( gl_active ) {
SDL_SetError("OpenGL context already created");
return -1;
}
if ( path == NULL ) {
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path = SDL_getenv("SDL_VIDEO_GL_DRIVER");
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if ( path == NULL ) {
path = DEFAULT_OPENGL;
}
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if ( handle == NULL ) {
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#if defined(OPENGL_REQUIRS_DLOPEN) && defined(SDL_LOADSO_DLOPEN)
SDL_SetError("Failed loading %s", path);
#else
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/* SDL_LoadObject() will call SDL_SetError() for us. */
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}
/* Unload the old driver and reset the pointers */
X11_GL_UnloadLibrary(this);
/* Load new function pointers */
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this->gl_data->glXGetProcAddress =
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this->gl_data->glXChooseVisual =
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(XVisualInfo *(*)(Display *, int, int *)) GL_LoadFunction(handle, "glXChooseVisual");
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this->gl_data->glXCreateContext =
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(GLXContext (*)(Display *, XVisualInfo *, GLXContext, int)) GL_LoadFunction(handle, "glXCreateContext");
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this->gl_data->glXDestroyContext =
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this->gl_data->glXMakeCurrent =
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(int (*)(Display *, GLXDrawable, GLXContext)) GL_LoadFunction(handle, "glXMakeCurrent");
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this->gl_data->glXSwapBuffers =
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this->gl_data->glXGetConfig =
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(int (*)(Display *, XVisualInfo *, int, int *)) GL_LoadFunction(handle, "glXGetConfig");
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this->gl_data->glXQueryExtensionsString =
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(const char *(*)(Display *, int)) GL_LoadFunction(handle, "glXQueryExtensionsString");
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this->gl_data->glXSwapIntervalSGI =
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this->gl_data->glXSwapIntervalMESA =
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this->gl_data->glXGetSwapIntervalMESA =
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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 ) {
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SDL_strlcpy(this->gl_config.driver_path, path,
SDL_arraysize(this->gl_config.driver_path));
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} else {
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*this->gl_config.driver_path = '\0';
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}
return 0;
}
void *X11_GL_GetProcAddress(_THIS, const char* proc)
{
void* handle;
handle = this->gl_config.dll_handle;
if ( this->gl_data->glXGetProcAddress ) {
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return this->gl_data->glXGetProcAddress((const GLubyte *)proc);
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}
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}
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#endif /* SDL_VIDEO_OPENGL_GLX */