axmol/cocos2dx/CCConfiguration.h

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#ifndef __CCCONFIGURATION_H__
#define __CCCONFIGURATION_H__

#include "NSObject.h"
#include <GLES/gl.h>
#include <string>
namespace   cocos2d {

/**
 @brief 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. */
	inline int getMaxTextureSize(void)
	{
		return m_nMaxTextureSize;
	}

	/** OpenGL Max Modelview Stack Depth */
	inline int getMaxModelviewStackDepth(void)
	{
		return m_nMaxModelviewStackDepth;
	}

	/** 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
	 */
	inline bool isSupportsNPOT(void)
	{
		return m_bSupportsNPOT;
	}

	/** Whether or not PVR Texture Compressed is supported */
	inline bool isSupportsPVRTC(void)
	{
		return m_bSupportsPVRTC;
	}

	/** Whether or not BGRA8888 textures are supported.
	 @since v0.99.2
	 */
	inline bool isSupportsBGRA8888(void)
	{
		return m_bSupportsBGRA8888;
	}

	/** Whether or not glDiscardFramebufferEXT is supported
	 @since v0.99.2
	 */
	inline bool isSupportsDiscardFramebuffer(void)
	{
		return m_bSupportsDiscardFramebuffer;
	}

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

	bool init(void);

public:
	/** returns a shared instance of the CCConfiguration */
	static CCConfiguration* sharedConfiguration(void);
};
}//namespace   cocos2d 

#endif // __CCCONFIGURATION_H__