genesis-3d_engine/Engine/addons/resource/DXTextureDecompress.h

/****************************************************************************
Copyright (c) 2006 Simon Brown                          si@sjbrown.co.uk
Copyright (c) 2011-2013,WebJet Business Division,CYOU

http://www.genesis-3d.com.cn

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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
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****************************************************************************/
#ifndef __DXTextureDecompress_H__
#define __DXTextureDecompress_H__
#include "foundation/core/types.h"

namespace Resources
{

	class DXTextureDecompress
	{
	public:
		DXTextureDecompress(void);
		virtual ~DXTextureDecompress(void);

		static void DecompressImage (uint32* destData,const int imageW, const int imageH,  const uint32* srcData, int flags);

	


	};

}

//! All squish API functions live in this namespace.
namespace squish {

// -----------------------------------------------------------------------------

//! Typedef a quantity that is a single unsigned byte.
typedef unsigned char u8;

// -----------------------------------------------------------------------------

enum
{
	//! Use DXT1 compression.
	kDxt1 = ( 1 << 0 ), 
	
	//! Use DXT3 compression.
	kDxt3 = ( 1 << 1 ), 
	
	//! Use DXT5 compression.
	kDxt5 = ( 1 << 2 ), 
	
	//! Use a very slow but very high quality colour compressor.
	kColourIterativeClusterFit = ( 1 << 8 ),	
	
	//! Use a slow but high quality colour compressor (the default).
	kColourClusterFit = ( 1 << 3 ),	
	
	//! Use a fast but low quality colour compressor.
	kColourRangeFit	= ( 1 << 4 ),
	
	//! Use a perceptual metric for colour error (the default).
	kColourMetricPerceptual = ( 1 << 5 ),

	//! Use a uniform metric for colour error.
	kColourMetricUniform = ( 1 << 6 ),
	
	//! Weight the colour by alpha during cluster fit (disabled by default).
	kWeightColourByAlpha = ( 1 << 7 )
};



// -----------------------------------------------------------------------------

/*! @brief Decompresses a 4x4 block of pixels.

	@param rgba		Storage for the 16 decompressed pixels.
	@param block	The compressed DXT block.
	@param flags	Compression flags.

	The decompressed pixels will be written as a contiguous array of 16 rgba
	values, with each component as 1 byte each. In memory this is:
	
		{ r1, g1, b1, a1, .... , r16, g16, b16, a16 }
	
	The flags parameter should specify either kDxt1, kDxt3 or kDxt5 compression, 
	however, DXT1 will be used by default if none is specified. All other flags 
	are ignored.
*/
void Decompress( u8* rgba, void const* block, int flags );



// -----------------------------------------------------------------------------

/*! @brief Decompresses an image in memory.

	@param rgba		Storage for the decompressed pixels.
	@param width	The width of the source image.
	@param height	The height of the source image.
	@param blocks	The compressed DXT blocks.
	@param flags	Compression flags.
	
	The decompressed pixels will be written as a contiguous array of width*height
	16 rgba values, with each component as 1 byte each. In memory this is:
	
		{ r1, g1, b1, a1, .... , rn, gn, bn, an } for n = width*height
		
	The flags parameter should specify either kDxt1, kDxt3 or kDxt5 compression, 
	however, DXT1 will be used by default if none is specified. All other flags 
	are ignored.

	Internally this function calls squish::Decompress for each block.
*/
void DecompressImage( u8* rgba, int width, int height, void const* blocks, int flags );

// -----------------------------------------------------------------------------

void DecompressColour( u8* rgba, void const* block, bool isDxt1 );
void DecompressAlphaDxt3( u8* rgba, void const* block );
void DecompressAlphaDxt5( u8* rgba, void const* block );

} // namespace squish



#endif