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// Description:
// GL extension helpers.
//
// Copyright (C) 2001 Frank Becker
//
// 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
//
#ifndef _GLExtension_hpp_
#define _GLExtension_hpp_
extern "C" { typedef void (*__GL_EXT_FuncPtr)(); }
#define GLEXTCAST (__GL_EXT_FuncPtr)
#ifdef WIN32
# ifndef WINAPI
# define WINAPI
# endif
#endif
#include <gl++.hpp>
#include "SDL.h"
#include <stdio.h>
#include <string.h>
#include <Trace.hpp>
class GLExtension
{
public:
GLExtension( const char *extensionName)
{
//get all extensions, pad with space
if( !_paddedExtensions)
{
const char *extensions = (const char *)glGetString(GL_EXTENSIONS);
_paddedExtensions = new char[ strlen(extensions) +2];
strcat( strcpy( _paddedExtensions, extensions), " ");
// LOG_INFO << "[" << _paddedExtensions << "]" << endl;
}
_extensionName = new char[ strlen(extensionName)+1];
strcpy(_extensionName, extensionName);
//check if extension is supported
_isSupported = false;
if( strstr( _paddedExtensions, _extensionName))
{
LOG_INFO << "Supported: [" << _extensionName << "]" << endl;
_isSupported =true;
}
}
virtual ~GLExtension()
{
delete[] _extensionName;
}
virtual const char *getName( void) = 0;
static void close( void)
{
delete[] _paddedExtensions;
_paddedExtensions=0;
}
bool isSupported( void)
{
return _isSupported;
}
protected:
__GL_EXT_FuncPtr GetExtensionProc( char *fName)
{
__GL_EXT_FuncPtr fn = (__GL_EXT_FuncPtr) SDL_GL_GetProcAddress(fName);
if(!fn)
{
LOG_ERROR << getName() << ": Unable to get function pointer for "
<< fName << endl;
}
return fn;
}
private:
GLExtension( void);
GLExtension( const GLExtension&);
GLExtension &operator=(const GLExtension&);
bool _isSupported;
char *_extensionName;
static char *_paddedExtensions;
};
#endif
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