axmol/cocos2dx/textures/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
of this software and associated documentation files (the "Software"), to deal
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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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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/

#ifndef __CCPVRTEXTURE_H__
#define __CCPVRTEXTURE_H__

#include "CCStdC.h"
#include "CCGL.h"
#include "cocoa/CCObject.h"
#include "cocoa/CCArray.h"

NS_CC_BEGIN

/**
 * @addtogroup textures
 * @{
 */

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

typedef struct _ccPVRTexturePixelFormatInfo {
	GLenum internalFormat;
	GLenum format;
	GLenum type;
	uint32_t bpp;
	bool compressed;
	bool alpha;
	CCTexture2DPixelFormat ccPixelFormat;
} ccPVRTexturePixelFormatInfo;

/**
 @brief Determine 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* create(const char* path);
    
    // properties 
    
    /** texture id name */
    inline unsigned int getName() { return _name; }
    /** texture width */
    inline unsigned int getWidth() { return _width; }
    /** texture height */
    inline unsigned int getHeight() { return _height; }
    /** whether or not the texture has alpha */
    inline bool hasAlpha() { return _hasAlpha; }
    /** whether or not the texture has premultiplied alpha */
    inline bool hasPremultipliedAlpha() { return _hasPremultipliedAlpha; }
    /** whether or not the texture should use hasPremultipliedAlpha instead of global default */
    inline bool isForcePremultipliedAlpha() { return _forcePremultipliedAlpha; }
    /** how many mipmaps the texture has. 1 means one level (level 0 */
    inline unsigned int getNumberOfMipmaps() { return _numberOfMipmaps; }
    inline CCTexture2DPixelFormat getFormat() { return _format; }
    inline bool isRetainName() { return _retainName; }
    inline void setRetainName(bool retainName) { _retainName = retainName; }

private:
    bool unpackPVRv2Data(unsigned char* data, unsigned int len);
    bool unpackPVRv3Data(unsigned char* dataPointer, unsigned int dataLength);
    bool createGLTexture();
    
protected:
    struct CCPVRMipmap _asMipmaps[CC_PVRMIPMAP_MAX];   // pointer to mipmap images    
    unsigned int _numberOfMipmaps;                    // number of mipmap used
    
    unsigned int _width, _height;
    GLuint _name;
    bool _hasAlpha;
    bool _hasPremultipliedAlpha;
    bool _forcePremultipliedAlpha;
    
    // cocos2d integration
    bool _retainName;
    CCTexture2DPixelFormat _format;
    
   const ccPVRTexturePixelFormatInfo *_pixelFormatInfo;
};

// end of textures group
/// @}

NS_CC_END


#endif //__CCPVRTEXTURE_H__