newtree/source/qfgl_ext.c
Jeff Teunissen d6241c11aa Remove special handling for the WGL extension list. It was broken, and
nobody on win32 fixed it. This made _all_ Windows GL binaries not work.
2001-01-23 04:06:35 +00:00

161 lines
3.3 KiB
C

/*
qfgl_ext.c
QuakeForge OpenGL extension interface definitions
Copyright (C) 2000 Jeff Teunissen <deek@dusknet.dhs.org>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_DLFCN_H
# include <dlfcn.h>
#endif
#ifndef RTLD_LAZY
# ifdef DL_LAZY
# define RTLD_LAZY DL_LAZY
# else
# define RTLD_LAZY 0
# endif
#endif
#ifdef _WIN32
// must be BEFORE include gl/gl.h
# include "winquake.h"
#endif
#include <GL/gl.h>
#ifdef HAVE_GL_GLX_H
# include <GL/glx.h>
#endif
#ifdef HAVE_GL_GLEXT_H
# include <GL/glext.h>
#endif
#ifdef HAVE_WINDOWS_H
# include <windows.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#include "qfgl_ext.h"
#include "qtypes.h"
/*
ParseExtensionList
It takes a bit of care to be fool-proof about parsing an OpenGL extensions
string. Don't be fooled by sub-strings, etc.
*/
qboolean
QFGL_ParseExtensionList (const GLubyte * list, const char *name)
{
const char *start;
char *where, *terminator;
// Extension names must not have spaces.
where = (GLubyte *) strchr (name, ' ');
if (where || *name == '\0')
return 0;
start = list;
for (;;) {
where = strstr (start, name);
if (!where)
break;
terminator = where + strlen (name);
if (where == start || *(where - 1) == ' ')
if (*terminator == ' ' || *terminator == '\0')
return 1;
start = terminator;
}
return 0;
}
qboolean
QFGL_ExtensionPresent (const char *name)
{
static const GLubyte *gl_extensions = NULL;
if (!gl_extensions) { // get and save GL extension list
gl_extensions = glGetString (GL_EXTENSIONS);
}
return QFGL_ParseExtensionList (gl_extensions, name);
}
void *
QFGL_ExtensionAddress (const char *name)
{
#if defined(HAVE_GLX) && defined(HAVE_DLOPEN)
void *dlhand = NULL;
static qboolean glProcAddress_present = true;
static QF_glXGetProcAddressARB qfglXGetProcAddress = NULL;
if (glProcAddress_present && !qfglXGetProcAddress) {
if (QFGL_ExtensionPresent ("GLX_ARB_get_proc_address")) {
if ((dlhand = dlopen (NULL, RTLD_LAZY))) {
qfglXGetProcAddress = dlsym (dlhand, "glXGetProcAddressARB");
dlclose (dlhand);
} else {
glProcAddress_present = false;
}
} else {
glProcAddress_present = false;
}
}
#endif
if (name) {
#if defined(HAVE_GLX) && defined(HAVE_DLOPEN)
if (glProcAddress_present) {
return qfglXGetProcAddress ((const GLubyte *) name);
} else {
if ((dlhand = dlopen (NULL, RTLD_LAZY))) {
void *handle;
handle = dlsym (dlhand, name);
dlclose (dlhand);
return handle;
}
return NULL;
}
#else
# ifdef _WIN32
return wglGetProcAddress (name);
# else
return NULL;
# endif
#endif
}
return NULL;
}