/*
Copyright (C) 1997-2001 Id Software, Inc.

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 the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
/*
** QGL_WIN.C
**
** This file implements the operating system binding of GL to QGL function
** pointers.  When doing a port of Qfusion you must implement the following
** two functions:
**
** QGL_Init() - loads libraries, assigns function pointers, etc.
** QGL_Shutdown() - unloads libraries, NULLs function pointers
*/

#define GL_GLEXT_LEGACY

#include <windows.h>
#include <GL/gl.h>
#include "../qcommon/qcommon.h"
#include "win_glw.h"

#define QGL_EXTERN

#define QGL_FUNC(type,name,params) type (APIENTRY * q##name) params;
#define QGL_EXT(type,name,params) type (APIENTRY * q##name) params;
#ifdef MYSTICARB
	#define QGL_ARB(type,name,params) type (APIENTRY * q##name) params;
#endif //MYSTICARB
#define QGL_WGL(type,name,params) type (APIENTRY * q##name) params;
#define QGL_WGL_EXT(type,name,params) type (APIENTRY * q##name) params;
#define QGL_GLX(type,name,params)
#define QGL_GLX_EXT(type,name,params)

#include "../ref_gl/qgl.h"

#undef QGL_GLX_EXT
#undef QGL_GLX
#undef QGL_WGL_EXT
#undef QGL_WGL
#undef QGL_EXT
#ifdef MYSTICARB
	#undef QGL_ARB
#endif //MYSTICARB
#undef QGL_FUNC

/*
** QGL_Shutdown
**
** Unloads the specified DLL then nulls out all the proc pointers.
*/
void QGL_Shutdown( void )
{
	if( glw_state.hinstOpenGL )
		FreeLibrary( glw_state.hinstOpenGL );
	glw_state.hinstOpenGL = NULL;

#define QGL_FUNC(type,name,params) (q##name) = NULL;
#define QGL_EXT(type,name,params) (q##name) = NULL;
#ifdef MYSTICARB
	#define QGL_ARB(type,name,params) (q##name) = NULL;
#endif //MYSTICARB
#define QGL_WGL(type,name,params) (q##name) = NULL;
#define QGL_WGL_EXT(type,name,params) (q##name) = NULL;
#define QGL_GLX(type,name,params)
#define QGL_GLX_EXT(type,name,params)

#include "../ref_gl/qgl.h"

#undef QGL_GLX_EXT
#undef QGL_GLX
#undef QGL_WGL_EXT
#undef QGL_WGL
#undef QGL_EXT
#ifdef MYSTICARB
	#undef QGL_ARB
#endif //MYSTICARB
#undef QGL_FUNC
}

#pragma warning (disable : 4113 4133 4047 )

/*
** QGL_Init
**
** This is responsible for binding our qgl function pointers to 
** the appropriate GL stuff. In Windows this means doing a 
** LoadLibrary and a bunch of calls to GetProcAddress. On other
** operating systems we need to do the right thing, whatever that
** might be.
** 
*/
qboolean QGL_Init( const char *dllname )
{
	if( ( glw_state.hinstOpenGL = LoadLibrary( dllname ) ) == 0 ) {
		char *buf;
		
		buf = NULL;
		FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &buf, 0, NULL );
		Com_Printf( "%s\n", buf );
		MessageBox(NULL, buf, "Error", 0 /* MB_OK */ );
		return qfalse;
	}

#define QGL_FUNC(type,name,params) (q##name) = ( void * )GetProcAddress( glw_state.hinstOpenGL, #name ); \
	if( !(q##name) ) { Com_Printf( "QGL_Init: Failed to get address for %s\n", #name ); return qfalse; }
#define QGL_EXT(type,name,params) (q##name) = NULL;
#ifdef MYSTICARB
	#define QGL_ARB(type,name,params) (q##name) = NULL;
#endif //MYSTICARB
#define QGL_WGL(type,name,params) (q##name) = ( void * )GetProcAddress( glw_state.hinstOpenGL, #name ); \
	if( !(q##name) ) { Com_Printf( "QGL_Init: Failed to get address for %s\n", #name ); return qfalse; }
#define QGL_WGL_EXT(type,name,params) (q##name) = NULL;
#define QGL_GLX(type,name,params)
#define QGL_GLX_EXT(type,name,params)

#include "../ref_gl/qgl.h"

#undef QGL_GLX_EXT
#undef QGL_GLX
#undef QGL_WGL_EXT
#undef QGL_WGL
#undef QGL_EXT
#ifdef MYSTICARB
	#undef QGL_ARB
#endif //MYSTICARB
#undef QGL_FUNC

	return qtrue;
}

/*
** qglGetProcAddress
*/
void *qglGetProcAddress( const GLubyte *procName ) {
	return (void *)qwglGetProcAddress( (LPCSTR)procName );
}
