mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-23 21:02:50 +00:00
160 lines
3.3 KiB
C
160 lines
3.3 KiB
C
/*
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qfgl_ext.c
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QuakeForge OpenGL extension interface definitions
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Copyright (C) 2000 Jeff Teunissen <deek@dusknet.dhs.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id$
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_DLFCN_H
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# include <dlfcn.h>
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#endif
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#ifndef RTLD_LAZY
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# ifdef DL_LAZY
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# define RTLD_LAZY DL_LAZY
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# else
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# define RTLD_LAZY 0
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# endif
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#endif
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#ifdef _WIN32
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// must be BEFORE include gl/gl.h
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# include "winquake.h"
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#endif
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#include <GL/gl.h>
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#ifdef HAVE_GL_GLX_H
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# include <GL/glx.h>
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#endif
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#ifdef HAVE_GL_GLEXT_H
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# include <GL/glext.h>
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#endif
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#ifdef HAVE_WINDOWS_H
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# include <windows.h>
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include "QF/qfgl_ext.h"
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#include "QF/qtypes.h"
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/*
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ParseExtensionList
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It takes a bit of care to be fool-proof about parsing an OpenGL extensions
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string. Don't be fooled by sub-strings, etc.
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*/
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qboolean
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QFGL_ParseExtensionList (const GLubyte * list, const char *name)
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{
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const char *start;
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char *where, *terminator;
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// Extension names must not have spaces.
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where = (GLubyte *) strchr (name, ' ');
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if (where || *name == '\0')
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return 0;
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start = list;
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for (;;) {
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where = strstr (start, name);
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if (!where)
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break;
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terminator = where + strlen (name);
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if (where == start || *(where - 1) == ' ')
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if (*terminator == ' ' || *terminator == '\0')
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return 1;
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start = terminator;
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}
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return 0;
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}
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qboolean
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QFGL_ExtensionPresent (const char *name)
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{
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static const GLubyte *gl_extensions = NULL;
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if (!gl_extensions) { // get and save GL extension list
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gl_extensions = glGetString (GL_EXTENSIONS);
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}
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return QFGL_ParseExtensionList (gl_extensions, name);
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}
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void *
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QFGL_ExtensionAddress (const char *name)
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{
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#if defined(HAVE_GLX) && defined(HAVE_DLOPEN)
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void *dlhand = NULL;
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static qboolean glProcAddress_present = true;
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static QF_glXGetProcAddressARB qfglXGetProcAddress = NULL;
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if (glProcAddress_present && !qfglXGetProcAddress) {
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if (QFGL_ExtensionPresent ("GLX_ARB_get_proc_address")) {
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if ((dlhand = dlopen (NULL, RTLD_LAZY))) {
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qfglXGetProcAddress = dlsym (dlhand, "glXGetProcAddressARB");
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dlclose (dlhand);
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} else {
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glProcAddress_present = false;
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}
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} else {
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glProcAddress_present = false;
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}
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}
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#endif
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if (name) {
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#if defined(HAVE_GLX) && defined(HAVE_DLOPEN)
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if (glProcAddress_present) {
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return qfglXGetProcAddress ((const GLubyte *) name);
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} else {
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if ((dlhand = dlopen (NULL, RTLD_LAZY))) {
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void *handle;
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handle = dlsym (dlhand, name);
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dlclose (dlhand);
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return handle;
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}
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return NULL;
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}
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#else
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# ifdef _WIN32
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return wglGetProcAddress (name);
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# else
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return NULL;
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# endif
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#endif
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}
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return NULL;
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}
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