/*
   Copyright (C) 1999-2006 Id Software, Inc. and contributors.
   For a list of contributors, see the accompanying CONTRIBUTORS file.

   This file is part of GtkRadiant.

   GtkRadiant 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.

   GtkRadiant 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 GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */


#include "qgl.h"
#include "globaldefs.h"

#include "debugging/debugging.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#if GDEF_OS_WINDOWS
#define WINGDIAPI __declspec( dllimport )
#define APIENTRY __stdcall
#endif

#if GDEF_OS_MACOS && !defined( XWINDOWS )
#include <OpenGL/gl.h>
#else
#include <GL/gl.h>
#endif

#if GDEF_OS_WINDOWS
#undef WINGDIAPI
#undef APIENTRY
#endif

#include "igl.h"




#if GDEF_OS_WINDOWS

#include <wtypes.h>

PROC ( WINAPI * qwglGetProcAddress )( LPCSTR );

#elif defined ( XWINDOWS )

#include <GL/glx.h>
#include <dlfcn.h>

Bool ( *qglXQueryExtension )( Display *dpy, int *errorb, int *event );
void*        ( *qglXGetProcAddressARB )( const GLubyte * procName );
typedef void* ( *glXGetProcAddressARBProc )( const GLubyte *procName );

#elif GDEF_OS_MACOS
#include <mach-o/dyld.h>
#include <stdlib.h>
#include <string.h>
#else
#error "unsupported platform"
#endif


void QGL_Shutdown( OpenGLBinding& table ){
	globalOutputStream() << "Shutting down OpenGL module...";

#if GDEF_OS_WINDOWS
	qwglGetProcAddress           = 0;
#elif defined( XWINDOWS )
	qglXQueryExtension           = glXQueryExtension;
	qglXGetProcAddressARB        = 0;
#elif GDEF_OS_MACOS
#else
#error "unsupported platform"
#endif

	globalOutputStream() << "Done.\n";
}


typedef struct glu_error_struct
{
	GLenum errnum;
	const char *errstr;
} GLU_ERROR_STRUCT;

GLU_ERROR_STRUCT glu_errlist[] = {
	{GL_NO_ERROR, "GL_NO_ERROR - no error"},
	{GL_INVALID_ENUM, "GL_INVALID_ENUM - An unacceptable value is specified for an enumerated argument."},
	{GL_INVALID_VALUE, "GL_INVALID_VALUE - A numeric argument is out of range."},
	{GL_INVALID_OPERATION, "GL_INVALID_OPERATION - The specified operation is not allowed in the current state."},
	{GL_STACK_OVERFLOW, "GL_STACK_OVERFLOW - Function would cause a stack overflow."},
	{GL_STACK_UNDERFLOW, "GL_STACK_UNDERFLOW - Function would cause a stack underflow."},
	{GL_OUT_OF_MEMORY, "GL_OUT_OF_MEMORY - There is not enough memory left to execute the function."},
	{0, 0}
};

const GLubyte* qgluErrorString( GLenum errCode ){
	int search = 0;
	for ( search = 0; glu_errlist[search].errstr; search++ )
	{
		if ( errCode == glu_errlist[search].errnum ) {
			return (const GLubyte *)glu_errlist[search].errstr;
		}
	} //end for
	return (const GLubyte *)"Unknown error";
}


void glInvalidFunction(){
	ERROR_MESSAGE( "calling an invalid OpenGL function" );
}

#define EXTENSIONS_ENABLED 1

bool QGL_ExtensionSupported( const char* extension ){
#if EXTENSIONS_ENABLED
	const GLubyte *extensions = 0;
	const GLubyte *start;
	GLubyte *where, *terminator;

	// Extension names should not have spaces.
	where = (GLubyte *) strchr( extension, ' ' );
	if ( where || *extension == '\0' ) {
		return false;
	}

	extensions = GlobalOpenGL().m_glGetString( GL_EXTENSIONS );
#if !GDEF_OS_MACOS
	if ( !extensions ) {
		return false;
	}
#endif

	// It takes a bit of care to be fool-proof about parsing the
	// OpenGL extensions string. Don't be fooled by sub-strings, etc.
	for ( start = extensions; ; )
	{
		where = (GLubyte *) strstr( (const char *) start, extension );
		if ( !where ) {
			break;
		}

		terminator = where + strlen( extension );
		if ( where == start || *( where - 1 ) == ' ' ) {
			if ( *terminator == ' ' || *terminator == '\0' ) {
				return true;
			}
		}

		start = terminator;
	}
#endif

	return false;
}

typedef int ( QGL_DLLEXPORT * QGLFunctionPointer )();

QGLFunctionPointer QGL_getExtensionFunc( const char* symbol ){
#if defined( XWINDOWS )
	//ASSERT_NOTNULL(qglXGetProcAddressARB);
	if ( qglXGetProcAddressARB == 0 ) {
		return reinterpret_cast<QGLFunctionPointer>( glInvalidFunction );
	}
	else
	{
		return (QGLFunctionPointer) qglXGetProcAddressARB( reinterpret_cast<const GLubyte*>( symbol ) );
	}
#elif GDEF_OS_MACOS
	// Prepend a '_' for the Unix C symbol mangling convention
	char *symbolName = (char *) malloc(strlen(symbol) + 2);
	strcpy(symbolName + 1, symbol);
	symbolName[0] = '_';
	NSSymbol nssymbol = NULL;
	if (NSIsSymbolNameDefined(symbolName)) nssymbol = NSLookupAndBindSymbol(symbolName);
	free(symbolName);
    return nssymbol ? reinterpret_cast<QGLFunctionPointer>(NSAddressOfSymbol(nssymbol)) : reinterpret_cast<QGLFunctionPointer>(glInvalidFunction);
#elif GDEF_OS_WINDOWS
	ASSERT_NOTNULL( qwglGetProcAddress );
	return (QGLFunctionPointer) qwglGetProcAddress( symbol );
#else
#error "unsupported platform"
#endif
}


template<typename Func>
bool QGL_constructExtensionFunc( Func& func, const char* symbol ){
	func = reinterpret_cast<Func>( QGL_getExtensionFunc( symbol ) );
	return func != 0;
}

template<typename Func>
void QGL_invalidateExtensionFunc( Func& func ){
	func = reinterpret_cast<Func>( glInvalidFunction );
}

void QGL_clear( OpenGLBinding& table ){
	QGL_invalidateExtensionFunc( table.m_glAccum );
	QGL_invalidateExtensionFunc( table.m_glAlphaFunc );
	QGL_invalidateExtensionFunc( table.m_glAreTexturesResident );
	QGL_invalidateExtensionFunc( table.m_glArrayElement );
	QGL_invalidateExtensionFunc( table.m_glBegin );
	QGL_invalidateExtensionFunc( table.m_glBindTexture );
	QGL_invalidateExtensionFunc( table.m_glBitmap );
	QGL_invalidateExtensionFunc( table.m_glBlendFunc );
	QGL_invalidateExtensionFunc( table.m_glCallList );
	QGL_invalidateExtensionFunc( table.m_glCallLists );
	QGL_invalidateExtensionFunc( table.m_glClear );
	QGL_invalidateExtensionFunc( table.m_glClearAccum );
	QGL_invalidateExtensionFunc( table.m_glClearColor );
	QGL_invalidateExtensionFunc( table.m_glClearDepth );
	QGL_invalidateExtensionFunc( table.m_glClearIndex );
	QGL_invalidateExtensionFunc( table.m_glClearStencil );
	QGL_invalidateExtensionFunc( table.m_glClipPlane );
	QGL_invalidateExtensionFunc( table.m_glColor3b );
	QGL_invalidateExtensionFunc( table.m_glColor3bv );
	QGL_invalidateExtensionFunc( table.m_glColor3d );
	QGL_invalidateExtensionFunc( table.m_glColor3dv );
	QGL_invalidateExtensionFunc( table.m_glColor3f );
	QGL_invalidateExtensionFunc( table.m_glColor3fv );
	QGL_invalidateExtensionFunc( table.m_glColor3i );
	QGL_invalidateExtensionFunc( table.m_glColor3iv );
	QGL_invalidateExtensionFunc( table.m_glColor3s );
	QGL_invalidateExtensionFunc( table.m_glColor3sv );
	QGL_invalidateExtensionFunc( table.m_glColor3ub );
	QGL_invalidateExtensionFunc( table.m_glColor3ubv );
	QGL_invalidateExtensionFunc( table.m_glColor3ui );
	QGL_invalidateExtensionFunc( table.m_glColor3uiv );
	QGL_invalidateExtensionFunc( table.m_glColor3us );
	QGL_invalidateExtensionFunc( table.m_glColor3usv );
	QGL_invalidateExtensionFunc( table.m_glColor4b );
	QGL_invalidateExtensionFunc( table.m_glColor4bv );
	QGL_invalidateExtensionFunc( table.m_glColor4d );
	QGL_invalidateExtensionFunc( table.m_glColor4dv );
	QGL_invalidateExtensionFunc( table.m_glColor4f );
	QGL_invalidateExtensionFunc( table.m_glColor4fv );
	QGL_invalidateExtensionFunc( table.m_glColor4i );
	QGL_invalidateExtensionFunc( table.m_glColor4iv );
	QGL_invalidateExtensionFunc( table.m_glColor4s );
	QGL_invalidateExtensionFunc( table.m_glColor4sv );
	QGL_invalidateExtensionFunc( table.m_glColor4ub );
	QGL_invalidateExtensionFunc( table.m_glColor4ubv );
	QGL_invalidateExtensionFunc( table.m_glColor4ui );
	QGL_invalidateExtensionFunc( table.m_glColor4uiv );
	QGL_invalidateExtensionFunc( table.m_glColor4us );
	QGL_invalidateExtensionFunc( table.m_glColor4usv );
	QGL_invalidateExtensionFunc( table.m_glColorMask );
	QGL_invalidateExtensionFunc( table.m_glColorMaterial );
	QGL_invalidateExtensionFunc( table.m_glColorPointer );
	QGL_invalidateExtensionFunc( table.m_glCopyPixels );
	QGL_invalidateExtensionFunc( table.m_glCopyTexImage1D );
	QGL_invalidateExtensionFunc( table.m_glCopyTexImage2D );
	QGL_invalidateExtensionFunc( table.m_glCopyTexSubImage1D );
	QGL_invalidateExtensionFunc( table.m_glCopyTexSubImage2D );
	QGL_invalidateExtensionFunc( table.m_glCullFace );
	QGL_invalidateExtensionFunc( table.m_glDeleteLists );
	QGL_invalidateExtensionFunc( table.m_glDeleteTextures );
	QGL_invalidateExtensionFunc( table.m_glDepthFunc );
	QGL_invalidateExtensionFunc( table.m_glDepthMask );
	QGL_invalidateExtensionFunc( table.m_glDepthRange );
	QGL_invalidateExtensionFunc( table.m_glDisable );
	QGL_invalidateExtensionFunc( table.m_glDisableClientState );
	QGL_invalidateExtensionFunc( table.m_glDrawArrays );
	QGL_invalidateExtensionFunc( table.m_glDrawBuffer );
	QGL_invalidateExtensionFunc( table.m_glDrawElements );
	QGL_invalidateExtensionFunc( table.m_glDrawPixels );
	QGL_invalidateExtensionFunc( table.m_glEdgeFlag );
	QGL_invalidateExtensionFunc( table.m_glEdgeFlagPointer );
	QGL_invalidateExtensionFunc( table.m_glEdgeFlagv );
	QGL_invalidateExtensionFunc( table.m_glEnable );
	QGL_invalidateExtensionFunc( table.m_glEnableClientState );
	QGL_invalidateExtensionFunc( table.m_glEnd );
	QGL_invalidateExtensionFunc( table.m_glEndList );
	QGL_invalidateExtensionFunc( table.m_glEvalCoord1d );
	QGL_invalidateExtensionFunc( table.m_glEvalCoord1dv );
	QGL_invalidateExtensionFunc( table.m_glEvalCoord1f );
	QGL_invalidateExtensionFunc( table.m_glEvalCoord1fv );
	QGL_invalidateExtensionFunc( table.m_glEvalCoord2d );
	QGL_invalidateExtensionFunc( table.m_glEvalCoord2dv );
	QGL_invalidateExtensionFunc( table.m_glEvalCoord2f );
	QGL_invalidateExtensionFunc( table.m_glEvalCoord2fv );
	QGL_invalidateExtensionFunc( table.m_glEvalMesh1 );
	QGL_invalidateExtensionFunc( table.m_glEvalMesh2 );
	QGL_invalidateExtensionFunc( table.m_glEvalPoint1 );
	QGL_invalidateExtensionFunc( table.m_glEvalPoint2 );
	QGL_invalidateExtensionFunc( table.m_glFeedbackBuffer );
	QGL_invalidateExtensionFunc( table.m_glFinish );
	QGL_invalidateExtensionFunc( table.m_glFlush );
	QGL_invalidateExtensionFunc( table.m_glFogf );
	QGL_invalidateExtensionFunc( table.m_glFogfv );
	QGL_invalidateExtensionFunc( table.m_glFogi );
	QGL_invalidateExtensionFunc( table.m_glFogiv );
	QGL_invalidateExtensionFunc( table.m_glFrontFace );
	QGL_invalidateExtensionFunc( table.m_glFrustum );
	QGL_invalidateExtensionFunc( table.m_glGenLists );
	QGL_invalidateExtensionFunc( table.m_glGenTextures );
	QGL_invalidateExtensionFunc( table.m_glGetBooleanv );
	QGL_invalidateExtensionFunc( table.m_glGetClipPlane );
	QGL_invalidateExtensionFunc( table.m_glGetDoublev );
	QGL_invalidateExtensionFunc( table.m_glGetError );
	QGL_invalidateExtensionFunc( table.m_glGetFloatv );
	QGL_invalidateExtensionFunc( table.m_glGetIntegerv );
	QGL_invalidateExtensionFunc( table.m_glGetLightfv );
	QGL_invalidateExtensionFunc( table.m_glGetLightiv );
	QGL_invalidateExtensionFunc( table.m_glGetMapdv );
	QGL_invalidateExtensionFunc( table.m_glGetMapfv );
	QGL_invalidateExtensionFunc( table.m_glGetMapiv );
	QGL_invalidateExtensionFunc( table.m_glGetMaterialfv );
	QGL_invalidateExtensionFunc( table.m_glGetMaterialiv );
	QGL_invalidateExtensionFunc( table.m_glGetPixelMapfv );
	QGL_invalidateExtensionFunc( table.m_glGetPixelMapuiv );
	QGL_invalidateExtensionFunc( table.m_glGetPixelMapusv );
	QGL_invalidateExtensionFunc( table.m_glGetPointerv );
	QGL_invalidateExtensionFunc( table.m_glGetPolygonStipple );
	table.m_glGetString = glGetString;
	QGL_invalidateExtensionFunc( table.m_glGetTexEnvfv );
	QGL_invalidateExtensionFunc( table.m_glGetTexEnviv );
	QGL_invalidateExtensionFunc( table.m_glGetTexGendv );
	QGL_invalidateExtensionFunc( table.m_glGetTexGenfv );
	QGL_invalidateExtensionFunc( table.m_glGetTexGeniv );
	QGL_invalidateExtensionFunc( table.m_glGetTexImage );
	QGL_invalidateExtensionFunc( table.m_glGetTexLevelParameterfv );
	QGL_invalidateExtensionFunc( table.m_glGetTexLevelParameteriv );
	QGL_invalidateExtensionFunc( table.m_glGetTexParameterfv );
	QGL_invalidateExtensionFunc( table.m_glGetTexParameteriv );
	QGL_invalidateExtensionFunc( table.m_glHint );
	QGL_invalidateExtensionFunc( table.m_glIndexMask );
	QGL_invalidateExtensionFunc( table.m_glIndexPointer );
	QGL_invalidateExtensionFunc( table.m_glIndexd );
	QGL_invalidateExtensionFunc( table.m_glIndexdv );
	QGL_invalidateExtensionFunc( table.m_glIndexf );
	QGL_invalidateExtensionFunc( table.m_glIndexfv );
	QGL_invalidateExtensionFunc( table.m_glIndexi );
	QGL_invalidateExtensionFunc( table.m_glIndexiv );
	QGL_invalidateExtensionFunc( table.m_glIndexs );
	QGL_invalidateExtensionFunc( table.m_glIndexsv );
	QGL_invalidateExtensionFunc( table.m_glIndexub );
	QGL_invalidateExtensionFunc( table.m_glIndexubv );
	QGL_invalidateExtensionFunc( table.m_glInitNames );
	QGL_invalidateExtensionFunc( table.m_glInterleavedArrays );
	QGL_invalidateExtensionFunc( table.m_glIsEnabled );
	QGL_invalidateExtensionFunc( table.m_glIsList );
	QGL_invalidateExtensionFunc( table.m_glIsTexture );
	QGL_invalidateExtensionFunc( table.m_glLightModelf );
	QGL_invalidateExtensionFunc( table.m_glLightModelfv );
	QGL_invalidateExtensionFunc( table.m_glLightModeli );
	QGL_invalidateExtensionFunc( table.m_glLightModeliv );
	QGL_invalidateExtensionFunc( table.m_glLightf );
	QGL_invalidateExtensionFunc( table.m_glLightfv );
	QGL_invalidateExtensionFunc( table.m_glLighti );
	QGL_invalidateExtensionFunc( table.m_glLightiv );
	QGL_invalidateExtensionFunc( table.m_glLineStipple );
	QGL_invalidateExtensionFunc( table.m_glLineWidth );
	QGL_invalidateExtensionFunc( table.m_glListBase );
	QGL_invalidateExtensionFunc( table.m_glLoadIdentity );
	QGL_invalidateExtensionFunc( table.m_glLoadMatrixd );
	QGL_invalidateExtensionFunc( table.m_glLoadMatrixf );
	QGL_invalidateExtensionFunc( table.m_glLoadName );
	QGL_invalidateExtensionFunc( table.m_glLogicOp );
	QGL_invalidateExtensionFunc( table.m_glMap1d );
	QGL_invalidateExtensionFunc( table.m_glMap1f );
	QGL_invalidateExtensionFunc( table.m_glMap2d );
	QGL_invalidateExtensionFunc( table.m_glMap2f );
	QGL_invalidateExtensionFunc( table.m_glMapGrid1d );
	QGL_invalidateExtensionFunc( table.m_glMapGrid1f );
	QGL_invalidateExtensionFunc( table.m_glMapGrid2d );
	QGL_invalidateExtensionFunc( table.m_glMapGrid2f );
	QGL_invalidateExtensionFunc( table.m_glMaterialf );
	QGL_invalidateExtensionFunc( table.m_glMaterialfv );
	QGL_invalidateExtensionFunc( table.m_glMateriali );
	QGL_invalidateExtensionFunc( table.m_glMaterialiv );
	QGL_invalidateExtensionFunc( table.m_glMatrixMode );
	QGL_invalidateExtensionFunc( table.m_glMultMatrixd );
	QGL_invalidateExtensionFunc( table.m_glMultMatrixf );
	QGL_invalidateExtensionFunc( table.m_glNewList );
	QGL_invalidateExtensionFunc( table.m_glNormal3b );
	QGL_invalidateExtensionFunc( table.m_glNormal3bv );
	QGL_invalidateExtensionFunc( table.m_glNormal3d );
	QGL_invalidateExtensionFunc( table.m_glNormal3dv );
	QGL_invalidateExtensionFunc( table.m_glNormal3f );
	QGL_invalidateExtensionFunc( table.m_glNormal3fv );
	QGL_invalidateExtensionFunc( table.m_glNormal3i );
	QGL_invalidateExtensionFunc( table.m_glNormal3iv );
	QGL_invalidateExtensionFunc( table.m_glNormal3s );
	QGL_invalidateExtensionFunc( table.m_glNormal3sv );
	QGL_invalidateExtensionFunc( table.m_glNormalPointer );
	QGL_invalidateExtensionFunc( table.m_glOrtho );
	QGL_invalidateExtensionFunc( table.m_glPassThrough );
	QGL_invalidateExtensionFunc( table.m_glPixelMapfv );
	QGL_invalidateExtensionFunc( table.m_glPixelMapuiv );
	QGL_invalidateExtensionFunc( table.m_glPixelMapusv );
	QGL_invalidateExtensionFunc( table.m_glPixelStoref );
	QGL_invalidateExtensionFunc( table.m_glPixelStorei );
	QGL_invalidateExtensionFunc( table.m_glPixelTransferf );
	QGL_invalidateExtensionFunc( table.m_glPixelTransferi );
	QGL_invalidateExtensionFunc( table.m_glPixelZoom );
	QGL_invalidateExtensionFunc( table.m_glPointSize );
	QGL_invalidateExtensionFunc( table.m_glPolygonMode );
	QGL_invalidateExtensionFunc( table.m_glPolygonOffset );
	QGL_invalidateExtensionFunc( table.m_glPolygonStipple );
	QGL_invalidateExtensionFunc( table.m_glPopAttrib );
	QGL_invalidateExtensionFunc( table.m_glPopClientAttrib );
	QGL_invalidateExtensionFunc( table.m_glPopMatrix );
	QGL_invalidateExtensionFunc( table.m_glPopName );
	QGL_invalidateExtensionFunc( table.m_glPrioritizeTextures );
	QGL_invalidateExtensionFunc( table.m_glPushAttrib );
	QGL_invalidateExtensionFunc( table.m_glPushClientAttrib );
	QGL_invalidateExtensionFunc( table.m_glPushMatrix );
	QGL_invalidateExtensionFunc( table.m_glPushName );
	QGL_invalidateExtensionFunc( table.m_glRasterPos2d );
	QGL_invalidateExtensionFunc( table.m_glRasterPos2dv );
	QGL_invalidateExtensionFunc( table.m_glRasterPos2f );
	QGL_invalidateExtensionFunc( table.m_glRasterPos2fv );
	QGL_invalidateExtensionFunc( table.m_glRasterPos2i );
	QGL_invalidateExtensionFunc( table.m_glRasterPos2iv );
	QGL_invalidateExtensionFunc( table.m_glRasterPos2s );
	QGL_invalidateExtensionFunc( table.m_glRasterPos2sv );
	QGL_invalidateExtensionFunc( table.m_glRasterPos3d );
	QGL_invalidateExtensionFunc( table.m_glRasterPos3dv );
	QGL_invalidateExtensionFunc( table.m_glRasterPos3f );
	QGL_invalidateExtensionFunc( table.m_glRasterPos3fv );
	QGL_invalidateExtensionFunc( table.m_glRasterPos3i );
	QGL_invalidateExtensionFunc( table.m_glRasterPos3iv );
	QGL_invalidateExtensionFunc( table.m_glRasterPos3s );
	QGL_invalidateExtensionFunc( table.m_glRasterPos3sv );
	QGL_invalidateExtensionFunc( table.m_glRasterPos4d );
	QGL_invalidateExtensionFunc( table.m_glRasterPos4dv );
	QGL_invalidateExtensionFunc( table.m_glRasterPos4f );
	QGL_invalidateExtensionFunc( table.m_glRasterPos4fv );
	QGL_invalidateExtensionFunc( table.m_glRasterPos4i );
	QGL_invalidateExtensionFunc( table.m_glRasterPos4iv );
	QGL_invalidateExtensionFunc( table.m_glRasterPos4s );
	QGL_invalidateExtensionFunc( table.m_glRasterPos4sv );
	QGL_invalidateExtensionFunc( table.m_glReadBuffer );
	QGL_invalidateExtensionFunc( table.m_glReadPixels );
	QGL_invalidateExtensionFunc( table.m_glRectd );
	QGL_invalidateExtensionFunc( table.m_glRectdv );
	QGL_invalidateExtensionFunc( table.m_glRectf );
	QGL_invalidateExtensionFunc( table.m_glRectfv );
	QGL_invalidateExtensionFunc( table.m_glRecti );
	QGL_invalidateExtensionFunc( table.m_glRectiv );
	QGL_invalidateExtensionFunc( table.m_glRects );
	QGL_invalidateExtensionFunc( table.m_glRectsv );
	QGL_invalidateExtensionFunc( table.m_glRenderMode );
	QGL_invalidateExtensionFunc( table.m_glRotated );
	QGL_invalidateExtensionFunc( table.m_glRotatef );
	QGL_invalidateExtensionFunc( table.m_glScaled );
	QGL_invalidateExtensionFunc( table.m_glScalef );
	QGL_invalidateExtensionFunc( table.m_glScissor );
	QGL_invalidateExtensionFunc( table.m_glSelectBuffer );
	QGL_invalidateExtensionFunc( table.m_glShadeModel );
	QGL_invalidateExtensionFunc( table.m_glStencilFunc );
	QGL_invalidateExtensionFunc( table.m_glStencilMask );
	QGL_invalidateExtensionFunc( table.m_glStencilOp );
	QGL_invalidateExtensionFunc( table.m_glTexCoord1d );
	QGL_invalidateExtensionFunc( table.m_glTexCoord1dv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord1f );
	QGL_invalidateExtensionFunc( table.m_glTexCoord1fv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord1i );
	QGL_invalidateExtensionFunc( table.m_glTexCoord1iv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord1s );
	QGL_invalidateExtensionFunc( table.m_glTexCoord1sv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord2d );
	QGL_invalidateExtensionFunc( table.m_glTexCoord2dv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord2f );
	QGL_invalidateExtensionFunc( table.m_glTexCoord2fv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord2i );
	QGL_invalidateExtensionFunc( table.m_glTexCoord2iv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord2s );
	QGL_invalidateExtensionFunc( table.m_glTexCoord2sv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord3d );
	QGL_invalidateExtensionFunc( table.m_glTexCoord3dv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord3f );
	QGL_invalidateExtensionFunc( table.m_glTexCoord3fv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord3i );
	QGL_invalidateExtensionFunc( table.m_glTexCoord3iv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord3s );
	QGL_invalidateExtensionFunc( table.m_glTexCoord3sv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord4d );
	QGL_invalidateExtensionFunc( table.m_glTexCoord4dv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord4f );
	QGL_invalidateExtensionFunc( table.m_glTexCoord4fv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord4i );
	QGL_invalidateExtensionFunc( table.m_glTexCoord4iv );
	QGL_invalidateExtensionFunc( table.m_glTexCoord4s );
	QGL_invalidateExtensionFunc( table.m_glTexCoord4sv );
	QGL_invalidateExtensionFunc( table.m_glTexCoordPointer );
	QGL_invalidateExtensionFunc( table.m_glTexEnvf );
	QGL_invalidateExtensionFunc( table.m_glTexEnvfv );
	QGL_invalidateExtensionFunc( table.m_glTexEnvi );
	QGL_invalidateExtensionFunc( table.m_glTexEnviv );
	QGL_invalidateExtensionFunc( table.m_glTexGend );
	QGL_invalidateExtensionFunc( table.m_glTexGendv );
	QGL_invalidateExtensionFunc( table.m_glTexGenf );
	QGL_invalidateExtensionFunc( table.m_glTexGenfv );
	QGL_invalidateExtensionFunc( table.m_glTexGeni );
	QGL_invalidateExtensionFunc( table.m_glTexGeniv );
	QGL_invalidateExtensionFunc( table.m_glTexImage1D );
	QGL_invalidateExtensionFunc( table.m_glTexImage2D );
	QGL_invalidateExtensionFunc( table.m_glTexParameterf );
	QGL_invalidateExtensionFunc( table.m_glTexParameterfv );
	QGL_invalidateExtensionFunc( table.m_glTexParameteri );
	QGL_invalidateExtensionFunc( table.m_glTexParameteriv );
	QGL_invalidateExtensionFunc( table.m_glTexSubImage1D );
	QGL_invalidateExtensionFunc( table.m_glTexSubImage2D );
	QGL_invalidateExtensionFunc( table.m_glTranslated );
	QGL_invalidateExtensionFunc( table.m_glTranslatef );
	QGL_invalidateExtensionFunc( table.m_glVertex2d );
	QGL_invalidateExtensionFunc( table.m_glVertex2dv );
	QGL_invalidateExtensionFunc( table.m_glVertex2f );
	QGL_invalidateExtensionFunc( table.m_glVertex2fv );
	QGL_invalidateExtensionFunc( table.m_glVertex2i );
	QGL_invalidateExtensionFunc( table.m_glVertex2iv );
	QGL_invalidateExtensionFunc( table.m_glVertex2s );
	QGL_invalidateExtensionFunc( table.m_glVertex2sv );
	QGL_invalidateExtensionFunc( table.m_glVertex3d );
	QGL_invalidateExtensionFunc( table.m_glVertex3dv );
	QGL_invalidateExtensionFunc( table.m_glVertex3f );
	QGL_invalidateExtensionFunc( table.m_glVertex3fv );
	QGL_invalidateExtensionFunc( table.m_glVertex3i );
	QGL_invalidateExtensionFunc( table.m_glVertex3iv );
	QGL_invalidateExtensionFunc( table.m_glVertex3s );
	QGL_invalidateExtensionFunc( table.m_glVertex3sv );
	QGL_invalidateExtensionFunc( table.m_glVertex4d );
	QGL_invalidateExtensionFunc( table.m_glVertex4dv );
	QGL_invalidateExtensionFunc( table.m_glVertex4f );
	QGL_invalidateExtensionFunc( table.m_glVertex4fv );
	QGL_invalidateExtensionFunc( table.m_glVertex4i );
	QGL_invalidateExtensionFunc( table.m_glVertex4iv );
	QGL_invalidateExtensionFunc( table.m_glVertex4s );
	QGL_invalidateExtensionFunc( table.m_glVertex4sv );
	QGL_invalidateExtensionFunc( table.m_glVertexPointer );
	QGL_invalidateExtensionFunc( table.m_glViewport );
}

int QGL_Init( OpenGLBinding& table ){
	QGL_clear( table );

#if GDEF_OS_WINDOWS
	qwglGetProcAddress           = wglGetProcAddress;
#elif defined( XWINDOWS )
	qglXGetProcAddressARB = (glXGetProcAddressARBProc)dlsym( RTLD_DEFAULT, "glXGetProcAddressARB" );
	if ( ( qglXQueryExtension == 0 ) || ( qglXQueryExtension(XOpenDisplay(nullptr), 0, 0) != True ) ) {
		return 0;
	}
#elif GDEF_OS_MACOS
#else
#error "unsupported platform"
#endif

	return 1;
}

int g_qglMajorVersion = 0;
int g_qglMinorVersion = 0;

// requires a valid gl context
void QGL_InitVersion(){
#if EXTENSIONS_ENABLED
	const std::size_t versionSize = 256;
	char version[versionSize];
	strncpy( version, reinterpret_cast<const char*>( GlobalOpenGL().m_glGetString( GL_VERSION ) ), versionSize - 1 );
	version[versionSize - 1] = '\0';
	char* firstDot = strchr( version, '.' );
	ASSERT_NOTNULL( firstDot );
	*firstDot = '\0';
	g_qglMajorVersion = atoi( version );
	char* secondDot = strchr( firstDot + 1, '.' );
	if ( secondDot != 0 ) {
		*secondDot = '\0';
	}
	g_qglMinorVersion = atoi( firstDot + 1 );
#else
	g_qglMajorVersion = 1;
	g_qglMinorVersion = 1;
#endif
}


inline void extension_not_implemented( const char* extension ){
	globalErrorStream() << "WARNING: OpenGL driver reports support for " << extension << " but does not implement it\n";
}

float g_maxTextureAnisotropy;

float QGL_maxTextureAnisotropy(){
	return g_maxTextureAnisotropy;
}

void QGL_sharedContextCreated( OpenGLBinding& table ){
	QGL_InitVersion();

	table.major_version = g_qglMajorVersion;
	table.minor_version = g_qglMinorVersion;

	table.m_glAccum                     = glAccum;
	table.m_glAlphaFunc                 = glAlphaFunc;
	table.m_glAreTexturesResident       = glAreTexturesResident;
	table.m_glArrayElement              = glArrayElement;
	table.m_glBegin                     = glBegin;
	table.m_glBindTexture               = glBindTexture;
	table.m_glBitmap                    = glBitmap;
	table.m_glBlendFunc                 = glBlendFunc;
	table.m_glCallList                  = glCallList;
	table.m_glCallLists                 = glCallLists;
	table.m_glClear                     = glClear;
	table.m_glClearAccum                = glClearAccum;
	table.m_glClearColor                = glClearColor;
	table.m_glClearDepth                = glClearDepth;
	table.m_glClearIndex                = glClearIndex;
	table.m_glClearStencil              = glClearStencil;
	table.m_glClipPlane                 = glClipPlane;
	table.m_glColor3b                   = glColor3b;
	table.m_glColor3bv                  = glColor3bv;
	table.m_glColor3d                   = glColor3d;
	table.m_glColor3dv                  = glColor3dv;
	table.m_glColor3f                   = glColor3f;
	table.m_glColor3fv                  = glColor3fv;
	table.m_glColor3i                   = glColor3i;
	table.m_glColor3iv                  = glColor3iv;
	table.m_glColor3s                   = glColor3s;
	table.m_glColor3sv                  = glColor3sv;
	table.m_glColor3ub                  = glColor3ub;
	table.m_glColor3ubv                 = glColor3ubv;
	table.m_glColor3ui                  = glColor3ui;
	table.m_glColor3uiv                 = glColor3uiv;
	table.m_glColor3us                  = glColor3us;
	table.m_glColor3usv                 = glColor3usv;
	table.m_glColor4b                   = glColor4b;
	table.m_glColor4bv                  = glColor4bv;
	table.m_glColor4d                   = glColor4d;
	table.m_glColor4dv                  = glColor4dv;
	table.m_glColor4f                   = glColor4f;
	table.m_glColor4fv                  = glColor4fv;
	table.m_glColor4i                   = glColor4i;
	table.m_glColor4iv                  = glColor4iv;
	table.m_glColor4s                   = glColor4s;
	table.m_glColor4sv                  = glColor4sv;
	table.m_glColor4ub                  = glColor4ub;
	table.m_glColor4ubv                 = glColor4ubv;
	table.m_glColor4ui                  = glColor4ui;
	table.m_glColor4uiv                 = glColor4uiv;
	table.m_glColor4us                  = glColor4us;
	table.m_glColor4usv                 = glColor4usv;
	table.m_glColorMask                 = glColorMask;
	table.m_glColorMaterial             = glColorMaterial;
	table.m_glColorPointer              = glColorPointer;
	table.m_glCopyPixels                = glCopyPixels;
	table.m_glCopyTexImage1D            = glCopyTexImage1D;
	table.m_glCopyTexImage2D            = glCopyTexImage2D;
	table.m_glCopyTexSubImage1D         = glCopyTexSubImage1D;
	table.m_glCopyTexSubImage2D         = glCopyTexSubImage2D;
	table.m_glCullFace                  = glCullFace;
	table.m_glDeleteLists               = glDeleteLists;
	table.m_glDeleteTextures            = glDeleteTextures;
	table.m_glDepthFunc                 = glDepthFunc;
	table.m_glDepthMask                 = glDepthMask;
	table.m_glDepthRange                = glDepthRange;
	table.m_glDisable                   = glDisable;
	table.m_glDisableClientState        = glDisableClientState;
	table.m_glDrawArrays                = glDrawArrays;
	table.m_glDrawBuffer                = glDrawBuffer;
	table.m_glDrawElements              = glDrawElements;
	table.m_glDrawPixels                = glDrawPixels;
	table.m_glEdgeFlag                  = glEdgeFlag;
	table.m_glEdgeFlagPointer           = glEdgeFlagPointer;
	table.m_glEdgeFlagv                 = glEdgeFlagv;
	table.m_glEnable                    = glEnable;
	table.m_glEnableClientState         = glEnableClientState;
	table.m_glEnd                       = glEnd;
	table.m_glEndList                   = glEndList;
	table.m_glEvalCoord1d               = glEvalCoord1d;
	table.m_glEvalCoord1dv              = glEvalCoord1dv;
	table.m_glEvalCoord1f               = glEvalCoord1f;
	table.m_glEvalCoord1fv              = glEvalCoord1fv;
	table.m_glEvalCoord2d               = glEvalCoord2d;
	table.m_glEvalCoord2dv              = glEvalCoord2dv;
	table.m_glEvalCoord2f               = glEvalCoord2f;
	table.m_glEvalCoord2fv              = glEvalCoord2fv;
	table.m_glEvalMesh1                 = glEvalMesh1;
	table.m_glEvalMesh2                 = glEvalMesh2;
	table.m_glEvalPoint1                = glEvalPoint1;
	table.m_glEvalPoint2                = glEvalPoint2;
	table.m_glFeedbackBuffer            = glFeedbackBuffer;
	table.m_glFinish                    = glFinish;
	table.m_glFlush                     = glFlush;
	table.m_glFogf                      = glFogf;
	table.m_glFogfv                     = glFogfv;
	table.m_glFogi                      = glFogi;
	table.m_glFogiv                     = glFogiv;
	table.m_glFrontFace                 = glFrontFace;
	table.m_glFrustum                   = glFrustum;
	table.m_glGenLists                  = glGenLists;
	table.m_glGenTextures               = glGenTextures;
	table.m_glGetBooleanv               = glGetBooleanv;
	table.m_glGetClipPlane              = glGetClipPlane;
	table.m_glGetDoublev                = glGetDoublev;
	table.m_glGetError                  = glGetError;
	table.m_glGetFloatv                 = glGetFloatv;
	table.m_glGetIntegerv               = glGetIntegerv;
	table.m_glGetLightfv                = glGetLightfv;
	table.m_glGetLightiv                = glGetLightiv;
	table.m_glGetMapdv                  = glGetMapdv;
	table.m_glGetMapfv                  = glGetMapfv;
	table.m_glGetMapiv                  = glGetMapiv;
	table.m_glGetMaterialfv             = glGetMaterialfv;
	table.m_glGetMaterialiv             = glGetMaterialiv;
	table.m_glGetPixelMapfv             = glGetPixelMapfv;
	table.m_glGetPixelMapuiv            = glGetPixelMapuiv;
	table.m_glGetPixelMapusv            = glGetPixelMapusv;
	table.m_glGetPointerv               = glGetPointerv;
	table.m_glGetPolygonStipple         = glGetPolygonStipple;
	table.m_glGetString                 = glGetString;
	table.m_glGetTexEnvfv               = glGetTexEnvfv;
	table.m_glGetTexEnviv               = glGetTexEnviv;
	table.m_glGetTexGendv               = glGetTexGendv;
	table.m_glGetTexGenfv               = glGetTexGenfv;
	table.m_glGetTexGeniv               = glGetTexGeniv;
	table.m_glGetTexImage               = glGetTexImage;
	table.m_glGetTexLevelParameterfv    = glGetTexLevelParameterfv;
	table.m_glGetTexLevelParameteriv    = glGetTexLevelParameteriv;
	table.m_glGetTexParameterfv         = glGetTexParameterfv;
	table.m_glGetTexParameteriv         = glGetTexParameteriv;
	table.m_glHint                      = glHint;
	table.m_glIndexMask                 = glIndexMask;
	table.m_glIndexPointer              = glIndexPointer;
	table.m_glIndexd                    = glIndexd;
	table.m_glIndexdv                   = glIndexdv;
	table.m_glIndexf                    = glIndexf;
	table.m_glIndexfv                   = glIndexfv;
	table.m_glIndexi                    = glIndexi;
	table.m_glIndexiv                   = glIndexiv;
	table.m_glIndexs                    = glIndexs;
	table.m_glIndexsv                   = glIndexsv;
	table.m_glIndexub                   = glIndexub;
	table.m_glIndexubv                  = glIndexubv;
	table.m_glInitNames                 = glInitNames;
	table.m_glInterleavedArrays         = glInterleavedArrays;
	table.m_glIsEnabled                 = glIsEnabled;
	table.m_glIsList                    = glIsList;
	table.m_glIsTexture                 = glIsTexture;
	table.m_glLightModelf               = glLightModelf;
	table.m_glLightModelfv              = glLightModelfv;
	table.m_glLightModeli               = glLightModeli;
	table.m_glLightModeliv              = glLightModeliv;
	table.m_glLightf                    = glLightf;
	table.m_glLightfv                   = glLightfv;
	table.m_glLighti                    = glLighti;
	table.m_glLightiv                   = glLightiv;
	table.m_glLineStipple               = glLineStipple;
	table.m_glLineWidth                 = glLineWidth;
	table.m_glListBase                  = glListBase;
	table.m_glLoadIdentity              = glLoadIdentity;
	table.m_glLoadMatrixd               = glLoadMatrixd;
	table.m_glLoadMatrixf               = glLoadMatrixf;
	table.m_glLoadName                  = glLoadName;
	table.m_glLogicOp                   = glLogicOp;
	table.m_glMap1d                     = glMap1d;
	table.m_glMap1f                     = glMap1f;
	table.m_glMap2d                     = glMap2d;
	table.m_glMap2f                     = glMap2f;
	table.m_glMapGrid1d                 = glMapGrid1d;
	table.m_glMapGrid1f                 = glMapGrid1f;
	table.m_glMapGrid2d                 = glMapGrid2d;
	table.m_glMapGrid2f                 = glMapGrid2f;
	table.m_glMaterialf                 = glMaterialf;
	table.m_glMaterialfv                = glMaterialfv;
	table.m_glMateriali                 = glMateriali;
	table.m_glMaterialiv                = glMaterialiv;
	table.m_glMatrixMode                = glMatrixMode;
	table.m_glMultMatrixd               = glMultMatrixd;
	table.m_glMultMatrixf               = glMultMatrixf;
	table.m_glNewList                   = glNewList;
	table.m_glNormal3b                  = glNormal3b;
	table.m_glNormal3bv                 = glNormal3bv;
	table.m_glNormal3d                  = glNormal3d;
	table.m_glNormal3dv                 = glNormal3dv;
	table.m_glNormal3f                  = glNormal3f;
	table.m_glNormal3fv                 = glNormal3fv;
	table.m_glNormal3i                  = glNormal3i;
	table.m_glNormal3iv                 = glNormal3iv;
	table.m_glNormal3s                  = glNormal3s;
	table.m_glNormal3sv                 = glNormal3sv;
	table.m_glNormalPointer             = glNormalPointer;
	table.m_glOrtho                     = glOrtho;
	table.m_glPassThrough               = glPassThrough;
	table.m_glPixelMapfv                = glPixelMapfv;
	table.m_glPixelMapuiv               = glPixelMapuiv;
	table.m_glPixelMapusv               = glPixelMapusv;
	table.m_glPixelStoref               = glPixelStoref;
	table.m_glPixelStorei               = glPixelStorei;
	table.m_glPixelTransferf            = glPixelTransferf;
	table.m_glPixelTransferi            = glPixelTransferi;
	table.m_glPixelZoom                 = glPixelZoom;
	table.m_glPointSize                 = glPointSize;
	table.m_glPolygonMode               = glPolygonMode;
	table.m_glPolygonOffset             = glPolygonOffset;
	table.m_glPolygonStipple            = glPolygonStipple;
	table.m_glPopAttrib                 = glPopAttrib;
	table.m_glPopClientAttrib           = glPopClientAttrib;
	table.m_glPopMatrix                 = glPopMatrix;
	table.m_glPopName                   = glPopName;
	table.m_glPrioritizeTextures        = glPrioritizeTextures;
	table.m_glPushAttrib                = glPushAttrib;
	table.m_glPushClientAttrib          = glPushClientAttrib;
	table.m_glPushMatrix                = glPushMatrix;
	table.m_glPushName                  = glPushName;
	table.m_glRasterPos2d               = glRasterPos2d;
	table.m_glRasterPos2dv              = glRasterPos2dv;
	table.m_glRasterPos2f               = glRasterPos2f;
	table.m_glRasterPos2fv              = glRasterPos2fv;
	table.m_glRasterPos2i               = glRasterPos2i;
	table.m_glRasterPos2iv              = glRasterPos2iv;
	table.m_glRasterPos2s               = glRasterPos2s;
	table.m_glRasterPos2sv              = glRasterPos2sv;
	table.m_glRasterPos3d               = glRasterPos3d;
	table.m_glRasterPos3dv              = glRasterPos3dv;
	table.m_glRasterPos3f               = glRasterPos3f;
	table.m_glRasterPos3fv              = glRasterPos3fv;
	table.m_glRasterPos3i               = glRasterPos3i;
	table.m_glRasterPos3iv              = glRasterPos3iv;
	table.m_glRasterPos3s               = glRasterPos3s;
	table.m_glRasterPos3sv              = glRasterPos3sv;
	table.m_glRasterPos4d               = glRasterPos4d;
	table.m_glRasterPos4dv              = glRasterPos4dv;
	table.m_glRasterPos4f               = glRasterPos4f;
	table.m_glRasterPos4fv              = glRasterPos4fv;
	table.m_glRasterPos4i               = glRasterPos4i;
	table.m_glRasterPos4iv              = glRasterPos4iv;
	table.m_glRasterPos4s               = glRasterPos4s;
	table.m_glRasterPos4sv              = glRasterPos4sv;
	table.m_glReadBuffer                = glReadBuffer;
	table.m_glReadPixels                = glReadPixels;
	table.m_glRectd                     = glRectd;
	table.m_glRectdv                    = glRectdv;
	table.m_glRectf                     = glRectf;
	table.m_glRectfv                    = glRectfv;
	table.m_glRecti                     = glRecti;
	table.m_glRectiv                    = glRectiv;
	table.m_glRects                     = glRects;
	table.m_glRectsv                    = glRectsv;
	table.m_glRenderMode                = glRenderMode;
	table.m_glRotated                   = glRotated;
	table.m_glRotatef                   = glRotatef;
	table.m_glScaled                    = glScaled;
	table.m_glScalef                    = glScalef;
	table.m_glScissor                   = glScissor;
	table.m_glSelectBuffer              = glSelectBuffer;
	table.m_glShadeModel                = glShadeModel;
	table.m_glStencilFunc               = glStencilFunc;
	table.m_glStencilMask               = glStencilMask;
	table.m_glStencilOp                 = glStencilOp;
	table.m_glTexCoord1d                = glTexCoord1d;
	table.m_glTexCoord1dv               = glTexCoord1dv;
	table.m_glTexCoord1f                = glTexCoord1f;
	table.m_glTexCoord1fv               = glTexCoord1fv;
	table.m_glTexCoord1i                = glTexCoord1i;
	table.m_glTexCoord1iv               = glTexCoord1iv;
	table.m_glTexCoord1s                = glTexCoord1s;
	table.m_glTexCoord1sv               = glTexCoord1sv;
	table.m_glTexCoord2d                = glTexCoord2d;
	table.m_glTexCoord2dv               = glTexCoord2dv;
	table.m_glTexCoord2f                = glTexCoord2f;
	table.m_glTexCoord2fv               = glTexCoord2fv;
	table.m_glTexCoord2i                = glTexCoord2i;
	table.m_glTexCoord2iv               = glTexCoord2iv;
	table.m_glTexCoord2s                = glTexCoord2s;
	table.m_glTexCoord2sv               = glTexCoord2sv;
	table.m_glTexCoord3d                = glTexCoord3d;
	table.m_glTexCoord3dv               = glTexCoord3dv;
	table.m_glTexCoord3f                = glTexCoord3f;
	table.m_glTexCoord3fv               = glTexCoord3fv;
	table.m_glTexCoord3i                = glTexCoord3i;
	table.m_glTexCoord3iv               = glTexCoord3iv;
	table.m_glTexCoord3s                = glTexCoord3s;
	table.m_glTexCoord3sv               = glTexCoord3sv;
	table.m_glTexCoord4d                = glTexCoord4d;
	table.m_glTexCoord4dv               = glTexCoord4dv;
	table.m_glTexCoord4f                = glTexCoord4f;
	table.m_glTexCoord4fv               = glTexCoord4fv;
	table.m_glTexCoord4i                = glTexCoord4i;
	table.m_glTexCoord4iv               = glTexCoord4iv;
	table.m_glTexCoord4s                = glTexCoord4s;
	table.m_glTexCoord4sv               = glTexCoord4sv;
	table.m_glTexCoordPointer           = glTexCoordPointer;
	table.m_glTexEnvf                   = glTexEnvf;
	table.m_glTexEnvfv                  = glTexEnvfv;
	table.m_glTexEnvi                   = glTexEnvi;
	table.m_glTexEnviv                  = glTexEnviv;
	table.m_glTexGend                   = glTexGend;
	table.m_glTexGendv                  = glTexGendv;
	table.m_glTexGenf                   = glTexGenf;
	table.m_glTexGenfv                  = glTexGenfv;
	table.m_glTexGeni                   = glTexGeni;
	table.m_glTexGeniv                  = glTexGeniv;
	table.m_glTexImage1D                = glTexImage1D;
	table.m_glTexImage2D                = glTexImage2D;
	table.m_glTexParameterf             = glTexParameterf;
	table.m_glTexParameterfv            = glTexParameterfv;
	table.m_glTexParameteri             = glTexParameteri;
	table.m_glTexParameteriv            = glTexParameteriv;
	table.m_glTexSubImage1D             = glTexSubImage1D;
	table.m_glTexSubImage2D             = glTexSubImage2D;
	table.m_glTranslated                = glTranslated;
	table.m_glTranslatef                = glTranslatef;
	table.m_glVertex2d                  = glVertex2d;
	table.m_glVertex2dv                 = glVertex2dv;
	table.m_glVertex2f                  = glVertex2f;
	table.m_glVertex2fv                 = glVertex2fv;
	table.m_glVertex2i                  = glVertex2i;
	table.m_glVertex2iv                 = glVertex2iv;
	table.m_glVertex2s                  = glVertex2s;
	table.m_glVertex2sv                 = glVertex2sv;
	table.m_glVertex3d                  = glVertex3d;
	table.m_glVertex3dv                 = glVertex3dv;
	table.m_glVertex3f                  = glVertex3f;
	table.m_glVertex3fv                 = glVertex3fv;
	table.m_glVertex3i                  = glVertex3i;
	table.m_glVertex3iv                 = glVertex3iv;
	table.m_glVertex3s                  = glVertex3s;
	table.m_glVertex3sv                 = glVertex3sv;
	table.m_glVertex4d                  = glVertex4d;
	table.m_glVertex4dv                 = glVertex4dv;
	table.m_glVertex4f                  = glVertex4f;
	table.m_glVertex4fv                 = glVertex4fv;
	table.m_glVertex4i                  = glVertex4i;
	table.m_glVertex4iv                 = glVertex4iv;
	table.m_glVertex4s                  = glVertex4s;
	table.m_glVertex4sv                 = glVertex4sv;
	table.m_glVertexPointer             = glVertexPointer;
	table.m_glViewport                  = glViewport;

	if ( QGL_ExtensionSupported( "GL_ARB_multitexture" ) ) {
		table.support_ARB_multitexture =
			QGL_constructExtensionFunc( table.m_glActiveTextureARB, "glActiveTextureARB" )
			&& QGL_constructExtensionFunc( table.m_glClientActiveTextureARB, "glClientActiveTextureARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1dARB, "glMultiTexCoord1dARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1dvARB, "glMultiTexCoord1dvARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1fARB, "glMultiTexCoord1fARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1fvARB, "glMultiTexCoord1fvARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1iARB, "glMultiTexCoord1iARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1ivARB, "glMultiTexCoord1ivARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1sARB, "glMultiTexCoord1sARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1svARB, "glMultiTexCoord1svARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2dARB, "glMultiTexCoord2dARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2dvARB, "glMultiTexCoord2dvARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2fARB, "glMultiTexCoord2fARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2fvARB, "glMultiTexCoord2fvARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2iARB, "glMultiTexCoord2iARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2ivARB, "glMultiTexCoord2ivARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2sARB, "glMultiTexCoord2sARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2svARB, "glMultiTexCoord2svARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3dARB, "glMultiTexCoord3dARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3dvARB, "glMultiTexCoord3dvARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3fARB, "glMultiTexCoord3fARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3fvARB, "glMultiTexCoord3fvARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3iARB, "glMultiTexCoord3iARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3ivARB, "glMultiTexCoord3ivARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3sARB, "glMultiTexCoord3sARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3svARB, "glMultiTexCoord3svARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4dARB, "glMultiTexCoord4dARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4dvARB, "glMultiTexCoord4dvARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4fARB, "glMultiTexCoord4fARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4fvARB, "glMultiTexCoord4fvARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4iARB, "glMultiTexCoord4iARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4ivARB, "glMultiTexCoord4ivARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4sARB, "glMultiTexCoord4sARB" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4svARB, "glMultiTexCoord4svARB" );

		if ( !table.support_ARB_multitexture ) {
			extension_not_implemented( "GL_ARB_multitexture" );
		}
	}
	else
	{
		table.support_ARB_multitexture = false;
	}

	if ( QGL_ExtensionSupported( "GL_ARB_texture_compression" ) ) {
		table.support_ARB_texture_compression =
			QGL_constructExtensionFunc( table.m_glCompressedTexImage3DARB, "glCompressedTexImage3DARB" )
			&& QGL_constructExtensionFunc( table.m_glCompressedTexImage2DARB, "glCompressedTexImage2DARB" )
			&& QGL_constructExtensionFunc( table.m_glCompressedTexImage1DARB, "glCompressedTexImage1DARB" )
			&& QGL_constructExtensionFunc( table.m_glCompressedTexSubImage3DARB, "glCompressedTexSubImage3DARB" )
			&& QGL_constructExtensionFunc( table.m_glCompressedTexSubImage2DARB, "glCompressedTexSubImage2DARB" )
			&& QGL_constructExtensionFunc( table.m_glCompressedTexSubImage1DARB, "glCompressedTexSubImage1DARB" )
			&& QGL_constructExtensionFunc( table.m_glGetCompressedTexImageARB, "glGetCompressedTexImageARB" );

		if ( !table.support_ARB_texture_compression ) {
			extension_not_implemented( "GL_ARB_texture_compression" );
		}
	}
	else
	{
		table.support_ARB_texture_compression = false;
	}

	table.support_EXT_texture_compression_s3tc = QGL_ExtensionSupported( "GL_EXT_texture_compression_s3tc" );

	// GL 1.2
	if ( table.major_version > 1 || table.minor_version >= 2 ) {
		table.support_GL_1_2 =
			QGL_constructExtensionFunc( table.m_glCopyTexSubImage3D, "glCopyTexSubImage3D" )
			&& QGL_constructExtensionFunc( table.m_glDrawRangeElements, "glDrawRangeElements" )
			&& QGL_constructExtensionFunc( table.m_glTexImage3D, "glTexImage3D" )
			&& QGL_constructExtensionFunc( table.m_glTexSubImage3D, "glTexSubImage3D" );

		if ( !table.support_GL_1_2 ) {
			extension_not_implemented( "GL_VERSION_1_2" );
		}
	}
	else
	{
		table.support_GL_1_2 = false;
	}

	// GL 1.3
	if ( table.major_version > 1 || table.minor_version >= 3 ) {
		table.support_GL_1_3 =
			QGL_constructExtensionFunc( table.m_glActiveTexture, "glActiveTexture" )
			&& QGL_constructExtensionFunc( table.m_glClientActiveTexture, "glClientActiveTexture" )
			&& QGL_constructExtensionFunc( table.m_glCompressedTexImage1D, "glCompressedTexImage1D" )
			&& QGL_constructExtensionFunc( table.m_glCompressedTexImage2D, "glCompressedTexImage2D" )
			&& QGL_constructExtensionFunc( table.m_glCompressedTexImage3D, "glCompressedTexImage3D" )
			&& QGL_constructExtensionFunc( table.m_glCompressedTexSubImage1D, "glCompressedTexSubImage1D" )
			&& QGL_constructExtensionFunc( table.m_glCompressedTexSubImage2D, "glCompressedTexSubImage2D" )
			&& QGL_constructExtensionFunc( table.m_glCompressedTexSubImage3D, "glCompressedTexSubImage3D" )
			&& QGL_constructExtensionFunc( table.m_glGetCompressedTexImage, "glGetCompressedTexImage" )
			&& QGL_constructExtensionFunc( table.m_glLoadTransposeMatrixd, "glLoadTransposeMatrixd" )
			&& QGL_constructExtensionFunc( table.m_glLoadTransposeMatrixf, "glLoadTransposeMatrixf" )
			&& QGL_constructExtensionFunc( table.m_glMultTransposeMatrixd, "glMultTransposeMatrixd" )
			&& QGL_constructExtensionFunc( table.m_glMultTransposeMatrixf, "glMultTransposeMatrixf" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1d, "glMultiTexCoord1d" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1dv, "glMultiTexCoord1dv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1f, "glMultiTexCoord1f" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1fv, "glMultiTexCoord1fv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1i, "glMultiTexCoord1i" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1iv, "glMultiTexCoord1iv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1s, "glMultiTexCoord1s" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord1sv, "glMultiTexCoord1sv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2d, "glMultiTexCoord2d" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2dv, "glMultiTexCoord2dv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2f, "glMultiTexCoord2f" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2fv, "glMultiTexCoord2fv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2i, "glMultiTexCoord2i" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2iv, "glMultiTexCoord2iv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2s, "glMultiTexCoord2s" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord2sv, "glMultiTexCoord2sv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3d, "glMultiTexCoord3d" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3dv, "glMultiTexCoord3dv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3f, "glMultiTexCoord3f" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3fv, "glMultiTexCoord3fv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3i, "glMultiTexCoord3i" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3iv, "glMultiTexCoord3iv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3s, "glMultiTexCoord3s" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord3sv, "glMultiTexCoord3sv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4d, "glMultiTexCoord4d" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4dv, "glMultiTexCoord4dv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4f, "glMultiTexCoord4f" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4fv, "glMultiTexCoord4fv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4i, "glMultiTexCoord4i" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4iv, "glMultiTexCoord4iv" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4s, "glMultiTexCoord4s" )
			&& QGL_constructExtensionFunc( table.m_glMultiTexCoord4sv, "glMultiTexCoord4sv" )
			&& QGL_constructExtensionFunc( table.m_glSampleCoverage, "glSampleCoverage" );

		if ( !table.support_GL_1_3 ) {
			extension_not_implemented( "GL_VERSION_1_3" );
		}
	}
	else
	{
		table.support_GL_1_3 = false;
	}

	// GL 1.4
	if ( table.major_version > 1 || table.minor_version >= 4 ) {
		table.support_GL_1_4 =
			QGL_constructExtensionFunc( table.m_glBlendColor, "glBlendColor" )
			&& QGL_constructExtensionFunc( table.m_glBlendEquation, "glBlendEquation" )
			&& QGL_constructExtensionFunc( table.m_glBlendFuncSeparate, "glBlendFuncSeparate" )
			&& QGL_constructExtensionFunc( table.m_glFogCoordPointer, "glFogCoordPointer" )
			&& QGL_constructExtensionFunc( table.m_glFogCoordd, "glFogCoordd" )
			&& QGL_constructExtensionFunc( table.m_glFogCoorddv, "glFogCoorddv" )
			&& QGL_constructExtensionFunc( table.m_glFogCoordf, "glFogCoordf" )
			&& QGL_constructExtensionFunc( table.m_glFogCoordfv, "glFogCoordfv" )
			&& QGL_constructExtensionFunc( table.m_glMultiDrawArrays, "glMultiDrawArrays" )
			&& QGL_constructExtensionFunc( table.m_glMultiDrawElements, "glMultiDrawElements" )
			&& QGL_constructExtensionFunc( table.m_glPointParameterf, "glPointParameterf" )
			&& QGL_constructExtensionFunc( table.m_glPointParameterfv, "glPointParameterfv" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3b, "glSecondaryColor3b" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3bv, "glSecondaryColor3bv" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3d, "glSecondaryColor3d" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3dv, "glSecondaryColor3dv" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3f, "glSecondaryColor3f" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3fv, "glSecondaryColor3fv" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3i, "glSecondaryColor3i" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3iv, "glSecondaryColor3iv" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3s, "glSecondaryColor3s" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3sv, "glSecondaryColor3sv" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3ub, "glSecondaryColor3ub" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3ubv, "glSecondaryColor3ubv" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3ui, "glSecondaryColor3ui" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3uiv, "glSecondaryColor3uiv" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3us, "glSecondaryColor3us" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColor3usv, "glSecondaryColor3usv" )
			&& QGL_constructExtensionFunc( table.m_glSecondaryColorPointer, "glSecondaryColorPointer" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos2d, "glWindowPos2d" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos2dv, "glWindowPos2dv" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos2f, "glWindowPos2f" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos2fv, "glWindowPos2fv" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos2i, "glWindowPos2i" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos2iv, "glWindowPos2iv" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos2s, "glWindowPos2s" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos2sv, "glWindowPos2sv" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos3d, "glWindowPos3d" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos3dv, "glWindowPos3dv" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos3f, "glWindowPos3f" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos3fv, "glWindowPos3fv" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos3i, "glWindowPos3i" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos3iv, "glWindowPos3iv" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos3s, "glWindowPos3s" )
			&& QGL_constructExtensionFunc( table.m_glWindowPos3sv, "glWindowPos3sv" );

		if ( !table.support_GL_1_4 ) {
			extension_not_implemented( "GL_VERSION_1_4" );
		}
	}
	else
	{
		table.support_GL_1_4 = false;
	}

	// GL 1.5
	if ( table.major_version > 1 || table.minor_version >= 5 ) {
		table.support_GL_1_5 =
			QGL_constructExtensionFunc( table.m_glBeginQuery, "glBeginQuery" )
			&& QGL_constructExtensionFunc( table.m_glBindBuffer, "glBindBuffer" )
			&& QGL_constructExtensionFunc( table.m_glBufferData, "glBufferData" )
			&& QGL_constructExtensionFunc( table.m_glBufferSubData, "glBufferSubData" )
			&& QGL_constructExtensionFunc( table.m_glDeleteBuffers, "glDeleteBuffers" )
			&& QGL_constructExtensionFunc( table.m_glDeleteQueries, "glDeleteQueries" )
			&& QGL_constructExtensionFunc( table.m_glEndQuery, "glEndQuery" )
			&& QGL_constructExtensionFunc( table.m_glGenBuffers, "glGenBuffers" )
			&& QGL_constructExtensionFunc( table.m_glGenQueries, "glGenQueries" )
			&& QGL_constructExtensionFunc( table.m_glGetBufferParameteriv, "glGetBufferParameteriv" )
			&& QGL_constructExtensionFunc( table.m_glGetBufferPointerv, "glGetBufferPointerv" )
			&& QGL_constructExtensionFunc( table.m_glGetBufferSubData, "glGetBufferSubData" )
			&& QGL_constructExtensionFunc( table.m_glGetQueryObjectiv, "glGetQueryObjectiv" )
			&& QGL_constructExtensionFunc( table.m_glGetQueryObjectuiv, "glGetQueryObjectuiv" )
			&& QGL_constructExtensionFunc( table.m_glGetQueryiv, "glGetQueryiv" )
			&& QGL_constructExtensionFunc( table.m_glIsBuffer, "glIsBuffer" )
			&& QGL_constructExtensionFunc( table.m_glIsQuery, "glIsQuery" )
			&& QGL_constructExtensionFunc( table.m_glMapBuffer, "glMapBuffer" )
			&& QGL_constructExtensionFunc( table.m_glUnmapBuffer, "glUnmapBuffer" );

		if ( !table.support_GL_1_5 ) {
			extension_not_implemented( "GL_VERSION_1_5" );
		}
	}
	else
	{
		table.support_GL_1_5 = false;
	}


	if ( QGL_ExtensionSupported( "GL_ARB_vertex_program" ) ) {
		table.support_ARB_vertex_program =
			QGL_constructExtensionFunc( table.m_glVertexAttrib1sARB, "glVertexAttrib1sARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib1fARB, "glVertexAttrib1fARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib1dARB, "glVertexAttrib1dARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2sARB, "glVertexAttrib2sARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2fARB, "glVertexAttrib2fARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2dARB, "glVertexAttrib2dARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3sARB, "glVertexAttrib3sARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3fARB, "glVertexAttrib3fARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3dARB, "glVertexAttrib3dARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4sARB, "glVertexAttrib4sARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4fARB, "glVertexAttrib4fARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4dARB, "glVertexAttrib4dARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NubARB, "glVertexAttrib4NubARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib1svARB, "glVertexAttrib1svARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib1fvARB, "glVertexAttrib1fvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib1dvARB, "glVertexAttrib1dvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2svARB, "glVertexAttrib2svARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2fvARB, "glVertexAttrib2fvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2dvARB, "glVertexAttrib2dvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3svARB, "glVertexAttrib3svARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3fvARB, "glVertexAttrib3fvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3dvARB, "glVertexAttrib3dvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4bvARB, "glVertexAttrib4bvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4svARB, "glVertexAttrib4svARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4ivARB, "glVertexAttrib4ivARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4ubvARB, "glVertexAttrib4ubvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4usvARB, "glVertexAttrib4usvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4uivARB, "glVertexAttrib4uivARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4fvARB, "glVertexAttrib4fvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4dvARB, "glVertexAttrib4dvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NbvARB, "glVertexAttrib4NbvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NsvARB, "glVertexAttrib4NsvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NivARB, "glVertexAttrib4NivARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NubvARB, "glVertexAttrib4NubvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NusvARB, "glVertexAttrib4NusvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NuivARB, "glVertexAttrib4NuivARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttribPointerARB, "glVertexAttribPointerARB" )
			&& QGL_constructExtensionFunc( table.m_glEnableVertexAttribArrayARB, "glEnableVertexAttribArrayARB" )
			&& QGL_constructExtensionFunc( table.m_glDisableVertexAttribArrayARB, "glDisableVertexAttribArrayARB" )
			&& QGL_constructExtensionFunc( table.m_glProgramStringARB, "glProgramStringARB" )
			&& QGL_constructExtensionFunc( table.m_glBindProgramARB, "glBindProgramARB" )
			&& QGL_constructExtensionFunc( table.m_glDeleteProgramsARB, "glDeleteProgramsARB" )
			&& QGL_constructExtensionFunc( table.m_glGenProgramsARB, "glGenProgramsARB" )
			&& QGL_constructExtensionFunc( table.m_glProgramEnvParameter4dARB, "glProgramEnvParameter4dARB" )
			&& QGL_constructExtensionFunc( table.m_glProgramEnvParameter4dvARB, "glProgramEnvParameter4dvARB" )
			&& QGL_constructExtensionFunc( table.m_glProgramEnvParameter4fARB, "glProgramEnvParameter4fARB" )
			&& QGL_constructExtensionFunc( table.m_glProgramEnvParameter4fvARB, "glProgramEnvParameter4fvARB" )
			&& QGL_constructExtensionFunc( table.m_glProgramLocalParameter4dARB, "glProgramLocalParameter4dARB" )
			&& QGL_constructExtensionFunc( table.m_glProgramLocalParameter4dvARB, "glProgramLocalParameter4dvARB" )
			&& QGL_constructExtensionFunc( table.m_glProgramLocalParameter4fARB, "glProgramLocalParameter4fARB" )
			&& QGL_constructExtensionFunc( table.m_glProgramLocalParameter4fvARB, "glProgramLocalParameter4fvARB" )
			&& QGL_constructExtensionFunc( table.m_glGetProgramEnvParameterdvARB, "glGetProgramEnvParameterdvARB" )
			&& QGL_constructExtensionFunc( table.m_glGetProgramEnvParameterfvARB, "glGetProgramEnvParameterfvARB" )
			&& QGL_constructExtensionFunc( table.m_glGetProgramLocalParameterdvARB, "glGetProgramLocalParameterdvARB" )
			&& QGL_constructExtensionFunc( table.m_glGetProgramLocalParameterfvARB, "glGetProgramLocalParameterfvARB" )
			&& QGL_constructExtensionFunc( table.m_glGetProgramivARB, "glGetProgramivARB" )
			&& QGL_constructExtensionFunc( table.m_glGetProgramStringARB, "glGetProgramStringARB" )
			&& QGL_constructExtensionFunc( table.m_glGetVertexAttribdvARB, "glGetVertexAttribdvARB" )
			&& QGL_constructExtensionFunc( table.m_glGetVertexAttribfvARB, "glGetVertexAttribfvARB" )
			&& QGL_constructExtensionFunc( table.m_glGetVertexAttribivARB, "glGetVertexAttribivARB" )
			&& QGL_constructExtensionFunc( table.m_glGetVertexAttribPointervARB, "glGetVertexAttribPointervARB" )
			&& QGL_constructExtensionFunc( table.m_glIsProgramARB, "glIsProgramARB" );

		if ( !table.support_ARB_vertex_program ) {
			extension_not_implemented( "GL_ARB_vertex_program" );
		}
	}
	else
	{
		table.support_ARB_vertex_program = false;
	}


	table.support_ARB_fragment_program = QGL_ExtensionSupported( "GL_ARB_fragment_program" );

	if ( QGL_ExtensionSupported( "GL_ARB_shader_objects" ) ) {
		table.support_ARB_shader_objects =
			QGL_constructExtensionFunc( table.m_glDeleteObjectARB, "glDeleteObjectARB" )
			&& QGL_constructExtensionFunc( table.m_glGetHandleARB, "glGetHandleARB" )
			&& QGL_constructExtensionFunc( table.m_glDetachObjectARB, "glDetachObjectARB" )
			&& QGL_constructExtensionFunc( table.m_glCreateShaderObjectARB, "glCreateShaderObjectARB" )
			&& QGL_constructExtensionFunc( table.m_glShaderSourceARB, "glShaderSourceARB" )
			&& QGL_constructExtensionFunc( table.m_glCompileShaderARB, "glCompileShaderARB" )
			&& QGL_constructExtensionFunc( table.m_glCreateProgramObjectARB, "glCreateProgramObjectARB" )
			&& QGL_constructExtensionFunc( table.m_glAttachObjectARB, "glAttachObjectARB" )
			&& QGL_constructExtensionFunc( table.m_glLinkProgramARB, "glLinkProgramARB" )
			&& QGL_constructExtensionFunc( table.m_glUseProgramObjectARB, "glUseProgramObjectARB" )
			&& QGL_constructExtensionFunc( table.m_glValidateProgramARB, "glValidateProgramARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform1fARB, "glUniform1fARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform2fARB, "glUniform2fARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform3fARB, "glUniform3fARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform4fARB, "glUniform4fARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform1iARB, "glUniform1iARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform2iARB, "glUniform2iARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform3iARB, "glUniform3iARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform4iARB, "glUniform4iARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform1fvARB, "glUniform1fvARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform2fvARB, "glUniform2fvARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform3fvARB, "glUniform3fvARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform4fvARB, "glUniform4fvARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform1ivARB, "glUniform1ivARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform2ivARB, "glUniform2ivARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform3ivARB, "glUniform3ivARB" )
			&& QGL_constructExtensionFunc( table.m_glUniform4ivARB, "glUniform4ivARB" )
			&& QGL_constructExtensionFunc( table.m_glUniformMatrix2fvARB, "glUniformMatrix2fvARB" )
			&& QGL_constructExtensionFunc( table.m_glUniformMatrix3fvARB, "glUniformMatrix3fvARB" )
			&& QGL_constructExtensionFunc( table.m_glUniformMatrix4fvARB, "glUniformMatrix4fvARB" )
			&& QGL_constructExtensionFunc( table.m_glGetObjectParameterfvARB, "glGetObjectParameterfvARB" )
			&& QGL_constructExtensionFunc( table.m_glGetObjectParameterivARB, "glGetObjectParameterivARB" )
			&& QGL_constructExtensionFunc( table.m_glGetInfoLogARB, "glGetInfoLogARB" )
			&& QGL_constructExtensionFunc( table.m_glGetAttachedObjectsARB, "glGetAttachedObjectsARB" )
			&& QGL_constructExtensionFunc( table.m_glGetUniformLocationARB, "glGetUniformLocationARB" )
			&& QGL_constructExtensionFunc( table.m_glGetActiveUniformARB, "glGetActiveUniformARB" )
			&& QGL_constructExtensionFunc( table.m_glGetUniformfvARB, "glGetUniformfvARB" )
			&& QGL_constructExtensionFunc( table.m_glGetUniformivARB, "glGetUniformivARB" )
			&& QGL_constructExtensionFunc( table.m_glGetShaderSourceARB, "glGetShaderSourceARB" );

		if ( !table.support_ARB_shader_objects ) {
			extension_not_implemented( "GL_ARB_shader_objects" );
		}
	}
	else
	{
		table.support_ARB_shader_objects = false;
	}

	if ( QGL_ExtensionSupported( "GL_ARB_vertex_shader" ) ) {
		table.support_ARB_vertex_shader =
			QGL_constructExtensionFunc( table.m_glVertexAttrib1fARB, "glVertexAttrib1fARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib1sARB, "glVertexAttrib1sARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib1dARB, "glVertexAttrib1dARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2fARB, "glVertexAttrib2fARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2sARB, "glVertexAttrib2sARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2dARB, "glVertexAttrib2dARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3fARB, "glVertexAttrib3fARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3sARB, "glVertexAttrib3sARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3dARB, "glVertexAttrib3dARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4fARB, "glVertexAttrib4fARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4sARB, "glVertexAttrib4sARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4dARB, "glVertexAttrib4dARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NubARB, "glVertexAttrib4NubARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib1fvARB, "glVertexAttrib1fvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib1svARB, "glVertexAttrib1svARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib1dvARB, "glVertexAttrib1dvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2fvARB, "glVertexAttrib2fvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2svARB, "glVertexAttrib2svARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2dvARB, "glVertexAttrib2dvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3fvARB, "glVertexAttrib3fvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3svARB, "glVertexAttrib3svARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3dvARB, "glVertexAttrib3dvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4fvARB, "glVertexAttrib4fvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4svARB, "glVertexAttrib4svARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4dvARB, "glVertexAttrib4dvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4ivARB, "glVertexAttrib4ivARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4bvARB, "glVertexAttrib4bvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4ubvARB, "glVertexAttrib4ubvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4usvARB, "glVertexAttrib4usvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4uivARB, "glVertexAttrib4uivARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NbvARB, "glVertexAttrib4NbvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NsvARB, "glVertexAttrib4NsvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NivARB, "glVertexAttrib4NivARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NubvARB, "glVertexAttrib4NubvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NusvARB, "glVertexAttrib4NusvARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4NuivARB, "glVertexAttrib4NuivARB" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttribPointerARB, "glVertexAttribPointerARB" )
			&& QGL_constructExtensionFunc( table.m_glEnableVertexAttribArrayARB, "glEnableVertexAttribArrayARB" )
			&& QGL_constructExtensionFunc( table.m_glDisableVertexAttribArrayARB, "glDisableVertexAttribArrayARB" )
			&& QGL_constructExtensionFunc( table.m_glGetVertexAttribdvARB, "glGetVertexAttribdvARB" )
			&& QGL_constructExtensionFunc( table.m_glGetVertexAttribfvARB, "glGetVertexAttribfvARB" )
			&& QGL_constructExtensionFunc( table.m_glGetVertexAttribivARB, "glGetVertexAttribivARB" )
			&& QGL_constructExtensionFunc( table.m_glGetVertexAttribPointervARB, "glGetVertexAttribPointervARB" )
			&& QGL_constructExtensionFunc( table.m_glBindAttribLocationARB, "glBindAttribLocationARB" )
			&& QGL_constructExtensionFunc( table.m_glGetActiveAttribARB, "glGetActiveAttribARB" )
			&& QGL_constructExtensionFunc( table.m_glGetAttribLocationARB, "glGetAttribLocationARB" );

		if ( !table.support_ARB_vertex_shader ) {
			extension_not_implemented( "GL_ARB_vertex_shader" );
		}
	}
	else
	{
		table.support_ARB_vertex_shader = false;
	}

	if ( QGL_ExtensionSupported( "GL_NV_vertex_program2" ) ) {
		table.support_NV_vertex_program2 =
			QGL_constructExtensionFunc( table.m_glAreProgramsResidentNV, "glAreProgramsResidentNV" )
			&& QGL_constructExtensionFunc( table.m_glBindProgramNV, "glBindProgramNV" )
			&& QGL_constructExtensionFunc( table.m_glDeleteProgramsNV, "glDeleteProgramsNV" )
			&& QGL_constructExtensionFunc( table.m_glExecuteProgramNV, "glExecuteProgramNV" )
			&& QGL_constructExtensionFunc( table.m_glGenProgramsNV, "glGenProgramsNV" )
			&& QGL_constructExtensionFunc( table.m_glGetProgramParameterdvNV, "glGetProgramParameterdvNV" )
			&& QGL_constructExtensionFunc( table.m_glGetProgramParameterfvNV, "glGetProgramParameterfvNV" )
			&& QGL_constructExtensionFunc( table.m_glGetProgramivNV, "glGetProgramivNV" )
			&& QGL_constructExtensionFunc( table.m_glGetProgramStringNV, "glGetProgramStringNV" )
			&& QGL_constructExtensionFunc( table.m_glGetTrackMatrixivNV, "glGetTrackMatrixivNV" )
			&& QGL_constructExtensionFunc( table.m_glGetVertexAttribdvNV, "glGetVertexAttribdvNV" )
			&& QGL_constructExtensionFunc( table.m_glGetVertexAttribfvNV, "glGetVertexAttribfvNV" )
			&& QGL_constructExtensionFunc( table.m_glGetVertexAttribivNV, "glGetVertexAttribivNV" )
			&& QGL_constructExtensionFunc( table.m_glGetVertexAttribPointervNV, "glGetVertexAttribPointervNV" )
			&& QGL_constructExtensionFunc( table.m_glIsProgramNV, "glIsProgramNV" )
			&& QGL_constructExtensionFunc( table.m_glLoadProgramNV, "glLoadProgramNV" )
			&& QGL_constructExtensionFunc( table.m_glProgramParameter4fNV, "glProgramParameter4fNV" )
			&& QGL_constructExtensionFunc( table.m_glProgramParameter4fvNV, "glProgramParameter4fvNV" )
			&& QGL_constructExtensionFunc( table.m_glProgramParameters4fvNV, "glProgramParameters4fvNV" )
			&& QGL_constructExtensionFunc( table.m_glRequestResidentProgramsNV, "glRequestResidentProgramsNV" )
			&& QGL_constructExtensionFunc( table.m_glTrackMatrixNV, "glTrackMatrixNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttribPointerNV, "glVertexAttribPointerNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib1fNV, "glVertexAttrib1fNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib1fvNV, "glVertexAttrib1fvNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2fNV, "glVertexAttrib2fNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib2fvNV, "glVertexAttrib2fvNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3fNV, "glVertexAttrib3fNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib3fvNV, "glVertexAttrib3fvNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4fNV, "glVertexAttrib4fNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttrib4fvNV, "glVertexAttrib4fvNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttribs1fvNV, "glVertexAttribs1fvNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttribs2fvNV, "glVertexAttribs2fvNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttribs3fvNV, "glVertexAttribs3fvNV" )
			&& QGL_constructExtensionFunc( table.m_glVertexAttribs4fvNV, "glVertexAttribs4fvNV" );

		if ( !table.support_NV_vertex_program2 ) {
			extension_not_implemented( "GL_NV_vertex_program2" );
		}
	}
	else
	{
		table.support_NV_vertex_program2 = false;
		QGL_invalidateExtensionFunc( table.m_glAreProgramsResidentNV );
		QGL_invalidateExtensionFunc( table.m_glBindProgramNV );
		QGL_invalidateExtensionFunc( table.m_glDeleteProgramsNV );
		QGL_invalidateExtensionFunc( table.m_glExecuteProgramNV );
		QGL_invalidateExtensionFunc( table.m_glGenProgramsNV );
		QGL_invalidateExtensionFunc( table.m_glGetProgramParameterdvNV );
		QGL_invalidateExtensionFunc( table.m_glGetProgramParameterfvNV );
		QGL_invalidateExtensionFunc( table.m_glGetProgramivNV );
		QGL_invalidateExtensionFunc( table.m_glGetProgramStringNV );
		QGL_invalidateExtensionFunc( table.m_glGetTrackMatrixivNV );
		QGL_invalidateExtensionFunc( table.m_glGetVertexAttribdvNV );
		QGL_invalidateExtensionFunc( table.m_glGetVertexAttribfvNV );
		QGL_invalidateExtensionFunc( table.m_glGetVertexAttribivNV );
		QGL_invalidateExtensionFunc( table.m_glGetVertexAttribPointervNV );
		QGL_invalidateExtensionFunc( table.m_glIsProgramNV );
		QGL_invalidateExtensionFunc( table.m_glLoadProgramNV );
		QGL_invalidateExtensionFunc( table.m_glProgramParameter4fNV );
		QGL_invalidateExtensionFunc( table.m_glProgramParameter4fvNV );
		QGL_invalidateExtensionFunc( table.m_glProgramParameters4fvNV );
		QGL_invalidateExtensionFunc( table.m_glRequestResidentProgramsNV );
		QGL_invalidateExtensionFunc( table.m_glTrackMatrixNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttribPointerNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttrib1fNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttrib1fvNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttrib2fNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttrib2fvNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttrib3fNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttrib3fvNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttrib4fNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttrib4fvNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttribs1fvNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttribs2fvNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttribs3fvNV );
		QGL_invalidateExtensionFunc( table.m_glVertexAttribs4fvNV );
	}

	if ( QGL_ExtensionSupported( "GL_NV_fragment_program" ) ) {
		table.support_NV_fragment_program =
			QGL_constructExtensionFunc( table.m_glProgramNamedParameter4fNV, "glProgramNamedParameter4fNV" )
			&& QGL_constructExtensionFunc( table.m_glProgramNamedParameter4fvNV, "glProgramNamedParameter4fvNV" )
			&& QGL_constructExtensionFunc( table.m_glGetProgramNamedParameterfvNV, "glGetProgramNamedParameterfvNV" );

		if ( !table.support_NV_fragment_program ) {
			extension_not_implemented( "GL_NV_fragment_program" );
		}
	}
	else
	{
		table.support_NV_fragment_program = false;
	}

	table.support_ARB_fragment_shader = QGL_ExtensionSupported( "GL_ARB_fragment_shader" );
	table.support_ARB_shading_language_100 = QGL_ExtensionSupported( "GL_ARB_shading_language_100" );

	if ( QGL_ExtensionSupported( "GL_EXT_texture_filter_anisotropic" ) ) {
		glGetFloatv( GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &g_maxTextureAnisotropy );
		globalOutputStream() << "Anisotropic filtering possible (max " << g_maxTextureAnisotropy << "x)\n";
	}
	else
	{
		globalOutputStream() << "No Anisotropic filtering available\n";
		g_maxTextureAnisotropy = 0;
	}
}

void QGL_sharedContextDestroyed( OpenGLBinding& table ){
	QGL_clear( table );
}


void QGL_assertNoErrors( const char *file, int line ){
	GLenum error = GlobalOpenGL().m_glGetError();
	while ( error != GL_NO_ERROR )
	{
		const char* errorString = reinterpret_cast<const char*>( qgluErrorString( error ) );
		if ( error == GL_OUT_OF_MEMORY ) {
			ERROR_MESSAGE( "OpenGL out of memory error at " << file << ":" << line << ": " << errorString );
		}
		else
		{
			ERROR_MESSAGE( "OpenGL error at " << file << ":" << line << ": " << errorString );
		}
		error = GlobalOpenGL().m_glGetError();
	}
}


class QglAPI
{
OpenGLBinding m_qgl;
public:
typedef OpenGLBinding Type;
STRING_CONSTANT( Name, "*" );

QglAPI(){
	QGL_Init( m_qgl );

	m_qgl.assertNoErrors = &QGL_assertNoErrors;
}
~QglAPI(){
	QGL_Shutdown( m_qgl );
}
OpenGLBinding* getTable(){
	return &m_qgl;
}
};

#include "modulesystem/singletonmodule.h"
#include "modulesystem/moduleregistry.h"

typedef SingletonModule<QglAPI> QglModule;
typedef Static<QglModule> StaticQglModule;
StaticRegisterModule staticRegisterQgl( StaticQglModule::instance() );
