mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-06 13:11:20 +00:00
155 lines
3.3 KiB
C
155 lines
3.3 KiB
C
/*
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gl_funcs.c
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GL functions.
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Copyright (C) 1996-1997 Id Software, Inc.
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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_WINDOWS_H
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# include <windows.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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#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 <stdio.h>
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#include <QF/cvar.h>
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#include <QF/console.h>
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#include <QF/sys.h>
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#include <QF/GL/funcs.h>
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#include "r_cvar.h"
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// First we need to get all the function pointers declared.
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#define QFGL_NEED(ret, name, args) \
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ret (GLAPIENTRY * qf##name) args;
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#include "QF/GL/qf_funcs_list.h"
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#undef QFGL_NEED
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void *libgl_handle;
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#if defined(HAVE_DLOPEN)
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static QF_glXGetProcAddressARB glGetProcAddress = NULL;
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static void * (*getProcAddress) (void *handle, const char *symbol);
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void *
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QFGL_LoadLibrary (void)
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{
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void *handle;
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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", gl_driver->string,
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dlerror ());
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}
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getProcAddress = dlsym;
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glGetProcAddress = dlsym (handle, "glXGetProcAddressARB");
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return handle;
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}
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#elif defined(_WIN32)
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static void * (APIENTRY *glGetProcAddress) (const char *) = NULL;
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static FARPROC (WINAPI *getProcAddress) (HINSTANCE,LPCSTR);
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void *
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QFGL_LoadLibrary (void)
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{
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void *handle;
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if (!(handle = LoadLibrary (gl_driver->string))) {
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Sys_Error ("Couldn't load OpenGL library %s!", gl_driver->string);
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}
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getProcAddress = GetProcAddress;
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(FARPROC)glGetProcAddress = GetProcAddress (handle, "wglGetProcAddress");
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return handle;
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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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// the following is to avoid other compiler errors
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static QF_glXGetProcAddressARB glGetProcAddress = NULL;
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static void * (*getProcAddress) (void *handle, const char *symbol);
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void *
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QFGL_LoadLibrary (void)
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{
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return 0;
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}
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#endif
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// Then we need to open the libGL and set all the symbols.
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qboolean
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GLF_Init (void)
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{
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libgl_handle = QFGL_LoadLibrary ();
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#define QFGL_NEED(ret, name, args) \
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qf##name = QFGL_ProcAddress (libgl_handle, #name, true);
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#include "QF/GL/qf_funcs_list.h"
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#undef QFGL_NEED
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return true;
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}
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void *
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QFGL_ProcAddress (void *handle, const char *name, qboolean crit)
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{
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void *glfunc = NULL;
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Con_DPrintf ("DEBUG: Finding symbol %s ... ", name);
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if (glGetProcAddress)
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glfunc = glGetProcAddress (name);
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if (!glfunc)
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glfunc = getProcAddress (handle, name);
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if (glfunc) {
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Con_DPrintf ("found [%p]\n", glfunc);
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return glfunc;
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}
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Con_DPrintf ("not found\n");
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if (crit)
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Sys_Error ("Couldn't load critical OpenGL function %s, exiting...",
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name);
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return NULL;
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}
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