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
in the Software without restriction, including without limitation the rights
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.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#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;
	Texture2DPixelFormat ccPixelFormat;
} ccPVRTexturePixelFormatInfo;

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


/** TexturePVR
     
 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 Texture2D#generateMipmap on the sheet texture itself
    (and to save space, save the PVR sprite sheet without mip maps included).
*/
class TexturePVR : public Object
{
public:
    /** creates and initializes a TexturePVR with a path */
    static TexturePVR* create(const char* path);

    TexturePVR();
    virtual ~TexturePVR();

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

    // properties
    
    /** texture id name */
    inline unsigned int getName() const { return _name; }
    /** texture width */
    inline unsigned int getWidth() const { return _width; }
    /** texture height */
    inline unsigned int getHeight() const { return _height; }
    /** whether or not the texture has alpha */
    inline bool hasAlpha() const { return _hasAlpha; }
    /** whether or not the texture has premultiplied alpha */
    inline bool hasPremultipliedAlpha() const { return _hasPremultipliedAlpha; }
    /** whether or not the texture should use hasPremultipliedAlpha instead of global default */
    inline bool isForcePremultipliedAlpha() const { return _forcePremultipliedAlpha; }
    /** how many mipmaps the texture has. 1 means one level (level 0 */
    inline unsigned int getNumberOfMipmaps() const { return _numberOfMipmaps; }
    inline Texture2DPixelFormat getFormat() const { return _format; }
    inline bool isRetainName() const { 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;
    Texture2DPixelFormat _format;
    
   const ccPVRTexturePixelFormatInfo *_pixelFormatInfo;
};

// end of textures group
/// @}

NS_CC_END


#endif //__CCPVRTEXTURE_H__