mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-12-11 21:31:30 +00:00
146 lines
3.3 KiB
C
146 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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*/
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static const char rcsid[] =
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"$Id$";
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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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#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/cvar.h"
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#include "QF/qtypes.h"
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#include "QF/sys.h"
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#include "QF/GL/extensions.h"
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#include "QF/GL/funcs.h"
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#include "r_cvar.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 = qfglGetString (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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void *handle;
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static qboolean glProcAddress_present = true;
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static QF_glXGetProcAddressARB glGetProcAddress = NULL;
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#if defined(HAVE_DLOPEN)
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if (!(handle = dlopen (gl_driver->string, RTLD_NOW))) {
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Sys_Error ("Couldn't load OpenGL library %s: %s\n", gl_driver->string,
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dlerror ());
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return 0;
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}
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#elif defined(_WIN32)
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if (!(handle = LoadLibrary (gl_driver->string))) {
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Sys_Error ("Couldn't load OpenGL library %s!\n", gl_driver->string);
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return 0;
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}
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#else
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# error "Cannot load libraries: %s was not configured with DSO support"
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#endif
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if (glProcAddress_present && !glGetProcAddress) {
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#if defined (_WIN32)
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glGetProcAddress = QFGL_ProcAddress (handle, "wglGetProcAddress", false);
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#else
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glGetProcAddress = QFGL_ProcAddress (handle, "glXGetProcAddressARB", false);
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#endif
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if (!glGetProcAddress)
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glProcAddress_present = false;
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}
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if (name && glProcAddress_present)
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return glGetProcAddress (name);
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return NULL;
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}
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