/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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****************************************************************************/

#ifndef __CCCONFIGURATION_H__
#define __CCCONFIGURATION_H__

#include "platform/platform.h"
#include "cocoa/NSObject.h"
#include <GLES/gl.h>
#include <string>

/**
 CCConfiguration contains some openGL variables
 @since v0.99.0
 */
class CCConfiguration : public NSObject
{
protected:
	GLint	m_nMaxTextureSize;
	GLint	m_nMaxModelviewStackDepth;
	bool	m_bSupportsPVRTC;
	bool	m_bSupportsNPOT;
	bool	m_bSupportsBGRA8888;
	bool	m_bSupportsDiscardFramebuffer;

public:
	CCConfiguration(void);
	
	// OpenGL Max texture size.
	INT32 getMaxTextureSize(void);

	// OpenGL Max Modelview Stack Depth
	INT32 getMaxModelviewStackDepth(void);

	/** Whether or not the GPU supports NPOT (Non Power Of Two) textures.
	 NPOT textures have the following limitations:
	 - They can't have mipmaps
	 - They only accept GL_CLAMP_TO_EDGE in GL_TEXTURE_WRAP_{S,T}
	 
	 @since v0.99.2
	 */
	bool isSupportsNPOT(void);

	// Whether or not PVR Texture Compressed is supported
	bool isSupportsPVRTC(void);

	/** Whether or not BGRA8888 textures are supported.
	 @since v0.99.2
	 */
	bool isSupportsBGRA8888(void);

	/** Whether or not glDiscardFramebufferEXT is supported
	 @since v0.99.2
	 */
	bool isSupportsDiscardFramebuffer(void);

	// returns whether or not an OpenGL is supported
	bool checkForGLExtension(const std::string &searchName);

	CCConfiguration* init(void);

public:
	// returns a shared instance of the CCConfiguration
	static CCConfiguration* sharedConfiguration(void);
};

#endif // __CCCONFIGURATION_H__