axmol/cocos2dx/include/CCTexturePVR.h

/****************************************************************************
Copyright (c) 2011 Jirka Fajfr for cocos2d-x
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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****************************************************************************/

#ifndef __CCPVRTEXTURE_H__
#define __CCPVRTEXTURE_H__

#include <string>
#include <stdint.h>

#include "CCGL.h"
#include "CCObject.h"
#include "CCMutableArray.h"

namespace   cocos2d {

//Forward definition for CCData
class CCData;

/**
 @brief Structure which can tell where mimap begins and how long is it
*/
struct CCPVRMipmap {
	unsigned char *address;
	unsigned int len;
};

/**
 @brief Detemine how many mipmaps can we have. 
 Its same as define but it respects namespaces
*/
enum {
	CC_PVRMIPMAP_MAX = 16,
};


/** CCTexturePVR
     
 Object that loads PVR images.

 Supported PVR formats:
    - RGBA8888
    - BGRA8888
    - RGBA4444
    - RGBA5551
    - RGB565
    - A8
    - I8
    - AI88
    - PVRTC 4BPP
    - PVRTC 2BPP
     
 Limitations:
    Pre-generated mipmaps, such as PVR textures with mipmap levels embedded in file,
    are only supported if all individual sprites are of _square_ size. 
    To use mipmaps with non-square textures, instead call CCTexture2D#generateMipmap on the sheet texture itself
    (and to save space, save the PVR sprite sheet without mip maps included).
*/
class CCTexturePVR : public CCObject
{
public:

	CCTexturePVR();
	virtual ~CCTexturePVR();

	/** initializes a CCTexturePVR with a path */
	bool initWithContentsOfFile(const char* path);

	/** creates and initializes a CCTexturePVR with a path */
	static CCTexturePVR * pvrTextureWithContentsOfFile(const char* path);

	CC_PROPERTY_READONLY(GLuint, m_uName, Name)
	CC_PROPERTY_READONLY(unsigned int, m_uWidth, Width)
	CC_PROPERTY_READONLY(unsigned int, m_uHeight, Height)
	CC_PROPERTY_READONLY(CCTexture2DPixelFormat, m_eFormat, Format)
	CC_PROPERTY_READONLY(bool, m_bHasAlpha, HasAlpha)

	// cocos2d integration
	CC_PROPERTY(bool, m_bRetainName, RetainName);

protected:

	/*
		Unpacks data (data of pvr texture file) and determine 
		how many mipmaps it uses (m_uNumberOfMipmaps). Adresses
		of mimaps (m_asMipmaps). And basic data like size, format
		and alpha presence
	*/
    bool unpackPVRData(unsigned char* data, unsigned int len);

	/*
		Binds all mipmaps to the GL state machine as separate
		textures
	*/
	bool createGLTexture();

	/*
		Index to the tableFormats array. Which tells us what exact 
		format is file which initializes this object. 
	*/
	unsigned int m_uTableFormatIndex;

	/*
		How many mipmaps do we have. It must be at least one
		when proper initialization finishes
	*/
	unsigned int m_uNumberOfMipmaps;

	/*
		Makrs for mipmaps. Each entry contains position in file
		and lenght of data which represents one mipmap.
	*/
	struct CCPVRMipmap m_asMipmaps[CC_PVRMIPMAP_MAX];
};
}//namespace   cocos2d 


#endif //__CCPVRTEXTURE_H__