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604 lines
28 KiB
C++
604 lines
28 KiB
C++
/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 BFG Edition Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#ifndef __DXTCODEC_H__
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#define __DXTCODEC_H__
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/*
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================================================================================================
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Contains the DxtEncoder and DxtDecoder declarations.
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================================================================================================
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*/
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/*
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================================================
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idDxtEncoder encodes Images in a number of DXT formats. Raw input Images are assumed to be in
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4-byte RGBA format. Raw input NormalMaps are assumed to be in 4-byte tangent-space NxNyNz format.
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The supported formats are:
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* DXT1 = colors in 4x4 block approximated by equidistant points on a line through 3D space
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* DXT2 = DXT3 + colors are pre-multiplied by alpha
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* DXT3 = DXT1 + explicit 4-bit alpha
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* DXT4 = DXT5 + colors are pre-multiplied by alpha
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* DXT5 = DXT1 + alpha values in 4x4 block approximated by equidistant points on line through alpha space
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* CTX1 = colors in a 4x4 block approximated by equidistant points on a line through 2D space
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* DXN1 = one DXT5 alpha block (aka DXT5A, or ATI1N)
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* DXN2 = two DXT5 alpha blocks (aka 3Dc, or ATI2N)
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================================================
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*/
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class idDxtEncoder {
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public:
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idDxtEncoder() { srcPadding = dstPadding = 0; }
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~idDxtEncoder() {}
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void SetSrcPadding( int pad ) { srcPadding = pad; }
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void SetDstPadding( int pad ) { dstPadding = pad; }
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// high quality DXT1 compression (no alpha), uses exhaustive search to find a line through color space and is very slow
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void CompressImageDXT1HQ( const byte *inBuf, byte *outBuf, int width, int height );
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// fast DXT1 compression (no alpha), for real-time use at the cost of a little quality
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void CompressImageDXT1Fast( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressImageDXT1Fast_Generic( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressImageDXT1Fast_SSE2( const byte *inBuf, byte *outBuf, int width, int height );
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// high quality DXT1 compression (with alpha), uses exhaustive search to find a line through color space and is very slow
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void CompressImageDXT1AlphaHQ( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
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// fast DXT1 compression (with alpha), for real-time use at the cost of a little quality
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void CompressImageDXT1AlphaFast( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressImageDXT1AlphaFast_Generic( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressImageDXT1AlphaFast_SSE2( const byte *inBuf, byte *outBuf, int width, int height );
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// high quality DXT5 compression, uses exhaustive search to find a line through color space and is generally
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// too slow to actually use for anything
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void CompressImageDXT5HQ( const byte *inBuf, byte *outBuf, int width, int height );
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// fast DXT5 compression for real-time use at the cost of a little quality
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void CompressImageDXT5Fast( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressImageDXT5Fast_Generic( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressImageDXT5Fast_SSE2( const byte *inBuf, byte *outBuf, int width, int height );
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// high quality CTX1 compression, uses exhaustive search to find a line through 2D space and is very slow
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void CompressImageCTX1HQ( const byte *inBuf, byte *outBuf, int width, int height );
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// fast CTX1 compression for real-time use
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void CompressImageCTX1Fast( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
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void CompressImageCTX1Fast_Generic( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
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void CompressImageCTX1Fast_SSE2( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
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// high quality DXN1 (aka DXT5A or ATI1N) compression, uses exhaustive search to find a line through color space and is very slow
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void CompressImageDXN1HQ( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
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// fast single channel compression into, DXN1 (aka DXT5A or ATI1N) format, for real-time use
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void CompressImageDXN1Fast( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressImageDXN1Fast_Generic( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressImageDXN1Fast_SSE2( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
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// high quality YCoCg DXT5 compression, uses exhaustive search to find a line through color space and is very slow
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void CompressYCoCgDXT5HQ( const byte *inBuf, byte *outBuf, int width, int height );
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// fast YCoCg DXT5 compression for real-time use (the input is expected to be in CoCg_Y format)
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void CompressYCoCgDXT5Fast( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressYCoCgDXT5Fast_Generic( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressYCoCgDXT5Fast_SSE2( const byte *inBuf, byte *outBuf, int width, int height );
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// fast YCoCg-Alpha DXT5 compression for real-time use (the input is expected to be in CoCgAY format)
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void CompressYCoCgAlphaDXT5Fast( const byte *inBuf, byte *outBuf, int width, int height );
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// high quality YCoCg CTX1 + DXT5A compression, uses exhaustive search to find a line through 2D space and is very slow
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void CompressYCoCgCTX1DXT5AHQ( const byte *inBuf, byte *outBuf, int width, int height );
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// fast YCoCg CTX1 + DXT5A compression for real-time use (the input is expected to be in CoCg_Y format)
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void CompressYCoCgCTX1DXT5AFast( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressYCoCgCTX1DXT5AFast_Generic( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressYCoCgCTX1DXT5AFast_SSE2( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
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// high quality tangent space NxNyNz normal map compression into DXT1 format (Nz is not used)
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void CompressNormalMapDXT1HQ( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressNormalMapDXT1RenormalizeHQ( const byte *inBuf, byte *outBuf, int width, int height );
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// fast tangent space NxNyNz normal map compression into DXT1 format (Nz is not used), for real-time use
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void CompressNormalMapDXT1Fast( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
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void CompressNormalMapDXT1Fast_Generic( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
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void CompressNormalMapDXT1Fast_SSE2( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
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// high quality tangent space _Ny_Nx normal map compression into DXT5 format
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void CompressNormalMapDXT5HQ( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressNormalMapDXT5RenormalizeHQ( const byte *inBuf, byte *outBuf, int width, int height );
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// fast tangent space _Ny_Nx normal map compression into DXT5 format, for real-time use
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void CompressNormalMapDXT5Fast( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressNormalMapDXT5Fast_Generic( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressNormalMapDXT5Fast_SSE2( const byte *inBuf, byte *outBuf, int width, int height );
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// high quality tangent space NxNy_ normal map compression into DXN2 (3Dc, ATI2N) format
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void CompressNormalMapDXN2HQ( const byte *inBuf, byte *outBuf, int width, int height );
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// fast tangent space NxNy_ normal map compression into DXN2 (3Dc, ATI2N) format, for real-time use
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void CompressNormalMapDXN2Fast( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressNormalMapDXN2Fast_Generic( const byte *inBuf, byte *outBuf, int width, int height );
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void CompressNormalMapDXN2Fast_SSE2( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
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// fast single channel conversion from DXN1 (aka DXT5A or ATI1N) to DXT1, reasonably fast (also works in-place)
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void ConvertImageDXN1_DXT1( const byte *inBuf, byte *outBuf, int width, int height );
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// fast single channel conversion from DXT1 to DXN1 (aka DXT5A or ATI1N), reasonably fast (also works in-place)
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void ConvertImageDXT1_DXN1( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
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// fast tangent space NxNyNz normal map conversion from DXN (3Dc, ATI2N) to DXT5, reasonably fast (also works in-place)
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void ConvertNormalMapDXN2_DXT5( const byte *inBuf, byte *outBuf, int width, int height );
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// fast tangent space NxNyNz normal map conversion DXT5 to DXN (3Dc, ATI2N), reasonably fast (also works in-place)
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void ConvertNormalMapDXT5_DXN2( const byte *inBuf, byte *outBuf, int width, int height );
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private:
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int width;
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int height;
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byte * outData;
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int srcPadding;
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int dstPadding;
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void EmitByte( byte b );
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void EmitUShort( unsigned short s );
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void EmitUInt( unsigned int i );
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unsigned int AlphaDistance( const byte a1, const byte a2 ) const;
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unsigned int ColorDistance( const byte *c1, const byte *c2 ) const;
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unsigned int ColorDistanceWeighted( const byte *c1, const byte *c2 ) const;
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unsigned int CTX1Distance( const byte *c1, const byte *c2 ) const;
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unsigned short ColorTo565( const byte *color ) const;
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unsigned short ColorTo565( byte r, byte g, byte b ) const;
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void ColorFrom565( unsigned short c565, byte *color ) const;
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byte GreenFrom565( unsigned short c565 ) const;
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void NV4XHardwareBugFix( byte *minColor, byte *maxColor ) const;
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bool HasConstantValuePer4x4Block( const byte *inBuf, int width, int height, int channel ) const;
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void WriteTinyColorDXT1( const byte *inBuf, int width, int height );
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void WriteTinyColorDXT5( const byte *inBuf, int width, int height );
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void WriteTinyColorCTX1DXT5A( const byte *inBuf, int width, int height );
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void WriteTinyNormalMapDXT5( const byte *NxNy, int width, int height );
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void WriteTinyNormalMapDXN( const byte *NxNy, int width, int height );
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void WriteTinyDXT5A( const byte *NxNy, int width, int height );
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void GetMinMaxColorsMaxDist( const byte *colorBlock, byte *minColor, byte *maxColor ) const;
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void GetMinMaxColorsLuminance( const byte *colorBlock, byte *minColor, byte *maxColor ) const;
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int GetSquareAlphaError( const byte *colorBlock, const int alphaOffset, const byte minAlpha, const byte maxAlpha, int lastError ) const;
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int GetMinMaxAlphaHQ( const byte *colorBlock, const int alphaOffset, byte *minColor, byte *maxColor ) const;
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int GetSquareColorsError( const byte *colorBlock, const unsigned short color0, const unsigned short color1, int lastError ) const;
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int GetMinMaxColorsHQ( const byte *colorBlock, byte *minColor, byte *maxColor, bool noBlack ) const;
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int GetSquareCTX1Error( const byte *colorBlock, const byte *color0, const byte *color1, int lastError ) const;
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int GetMinMaxCTX1HQ( const byte *colorBlock, byte *minColor, byte *maxColor ) const;
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int GetSquareNormalYError( const byte *colorBlock, const unsigned short color0, const unsigned short color1, int lastError, int scale ) const;
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int GetMinMaxNormalYHQ( const byte *colorBlock, byte *minColor, byte *maxColor, bool noBlack, int scale ) const;
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int GetSquareNormalsDXT1Error( const int *colorBlock, const unsigned short color0, const unsigned short color1, int lastError, unsigned int &colorIndices ) const;
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int GetMinMaxNormalsDXT1HQ( const byte *colorBlock, byte *minColor, byte *maxColor, unsigned int &colorIndices, bool noBlack ) const;
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int GetSquareNormalsDXT5Error( const int *normalBlock, const byte *minNormal, const byte *maxNormal, int lastError, unsigned int &colorIndices, byte *alphaIndices ) const;
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int GetMinMaxNormalsDXT5HQ( const byte *normalBlock, byte *minColor, byte *maxColor, unsigned int &colorIndices, byte *alphaIndices ) const;
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int GetMinMaxNormalsDXT5HQFast( const byte *normalBlock, byte *minColor, byte *maxColor, unsigned int &colorIndices, byte *alphaIndices ) const;
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void ScaleYCoCg( byte *colorBlock ) const;
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void BiasScaleNormalY( byte *colorBlock ) const;
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void RotateNormalsDXT1( byte *block ) const;
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void RotateNormalsDXT5( byte *block ) const;
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int FindColorIndices( const byte *colorBlock, const unsigned short color0, const unsigned short color1, unsigned int &result ) const;
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int FindAlphaIndices( const byte *colorBlock, const int alphaOffset, const byte alpha0, const byte alpha1, byte *indexes ) const;
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int FindCTX1Indices( const byte *colorBlock, const byte *color0, const byte *color1, unsigned int &result ) const;
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void ExtractBlock( const byte *inPtr, int width, byte *colorBlock ) const;
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void GetMinMaxBBox( const byte *colorBlock, byte *minColor, byte *maxColor ) const;
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void InsetColorsBBox( byte *minColor, byte *maxColor ) const;
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void SelectColorsDiagonal( const byte *colorBlock, byte *minColor, byte *maxColor ) const;
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void ScaleYCoCg( byte *colorBlock, byte *minColor, byte *maxColor ) const;
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void InsetYCoCgAlpaBBox( byte *minColor, byte *maxColor ) const;
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void InsetYCoCgBBox( byte *minColor, byte *maxColor ) const;
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void SelectYCoCgDiagonal( const byte *colorBlock, byte *minColor, byte *maxColor ) const;
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void InsetNormalsBBoxDXT5( byte *minNormal, byte *maxNormal ) const;
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void InsetNormalsBBox3Dc( byte *minNormal, byte *maxNormal ) const;
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void EmitColorIndices( const byte *colorBlock, const byte *minColor, const byte *maxColor );
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void EmitColorAlphaIndices( const byte *colorBlock, const byte *minColor, const byte *maxColor );
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void EmitCTX1Indices( const byte *colorBlock, const byte *minColor, const byte *maxColor );
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void EmitAlphaIndices( const byte *colorBlock, const int channel, const byte minAlpha, const byte maxAlpha );
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void EmitGreenIndices( const byte *block, const int channel, const byte minGreen, const byte maxGreen );
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// Keeping the ASM versions to keep the performance of 32-bit debug builds reasonable.
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// The implementation using intrinsics is very slow in debug builds because registers are continuously spilled to memory.
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void ExtractBlock_SSE2( const byte *inPtr, int width, byte *colorBlock ) const;
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void GetMinMaxBBox_SSE2( const byte *colorBlock, byte *minColor, byte *maxColor ) const;
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void InsetColorsBBox_SSE2( byte *minColor, byte *maxColor ) const;
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void InsetNormalsBBoxDXT5_SSE2( byte *minNormal, byte *maxNormal ) const;
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void EmitColorIndices_SSE2( const byte *colorBlock, const byte *minColor, const byte *maxColor );
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void EmitColorAlphaIndices_SSE2( const byte *colorBlock, const byte *minColor, const byte *maxColor );
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void EmitCoCgIndices_SSE2( const byte *colorBlock, const byte *minColor, const byte *maxColor );
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void EmitAlphaIndices_SSE2( const byte *colorBlock, const int minAlpha, const int maxAlpha );
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void EmitAlphaIndices_SSE2( const byte *colorBlock, const int channelBitOffset, const int minAlpha, const int maxAlpha );
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void EmitGreenIndices_SSE2( const byte *block, const int channelBitOffset, const int minGreen, const int maxGreen );
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void ScaleYCoCg_SSE2( byte *colorBlock, byte *minColor, byte *maxColor ) const;
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void InsetYCoCgBBox_SSE2( byte *minColor, byte *maxColor ) const;
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void SelectYCoCgDiagonal_SSE2( const byte *colorBlock, byte *minColor, byte *maxColor ) const;
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void EmitNormalYIndices( const byte *normalBlock, const int offset, const byte minNormalY, const byte maxNormalY );
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void EmitNormalYIndices_SSE2( const byte *normalBlock, const int offset, const byte minNormalY, const byte maxNormalY );
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void DecodeDXNAlphaValues( const byte *inBuf, byte *values );
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void EncodeDXNAlphaValues( byte *outBuf, const byte min, const byte max, const byte *values );
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void DecodeNormalYValues( const byte *inBuf, byte &min, byte &max, byte *values );
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void EncodeNormalRGBIndices( byte *outBuf, const byte min, const byte max, const byte *values );
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};
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/*
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========================
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idDxtEncoder::CompressImageDXT1Fast
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========================
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*/
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ID_INLINE void idDxtEncoder::CompressImageDXT1Fast( const byte *inBuf, byte *outBuf, int width, int height ) {
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CompressImageDXT1Fast_SSE2( inBuf, outBuf, width, height );
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}
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/*
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========================
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idDxtEncoder::CompressImageDXT1AlphaFast
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========================
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*/
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ID_INLINE void idDxtEncoder::CompressImageDXT1AlphaFast( const byte *inBuf, byte *outBuf, int width, int height ) {
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CompressImageDXT1AlphaFast_SSE2( inBuf, outBuf, width, height );
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}
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/*
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========================
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idDxtEncoder::CompressImageDXT5Fast
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========================
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*/
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ID_INLINE void idDxtEncoder::CompressImageDXT5Fast( const byte *inBuf, byte *outBuf, int width, int height ) {
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CompressImageDXT5Fast_SSE2( inBuf, outBuf, width, height );
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}
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/*
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========================
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idDxtEncoder::CompressImageDXN1Fast
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========================
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*/
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ID_INLINE void idDxtEncoder::CompressImageDXN1Fast( const byte *inBuf, byte *outBuf, int width, int height ) {
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CompressImageDXN1Fast_Generic( inBuf, outBuf, width, height );
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}
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/*
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========================
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idDxtEncoder::CompressYCoCgDXT5Fast
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========================
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*/
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ID_INLINE void idDxtEncoder::CompressYCoCgDXT5Fast( const byte *inBuf, byte *outBuf, int width, int height ) {
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CompressYCoCgDXT5Fast_SSE2( inBuf, outBuf, width, height );
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}
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/*
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========================
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idDxtEncoder::CompressYCoCgCTX1DXT5AFast
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========================
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*/
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ID_INLINE void idDxtEncoder::CompressYCoCgCTX1DXT5AFast( const byte *inBuf, byte *outBuf, int width, int height ) {
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CompressYCoCgCTX1DXT5AFast_Generic( inBuf, outBuf, width, height );
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}
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/*
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========================
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idDxtEncoder::CompressNormalMapDXT5Fast
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========================
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*/
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ID_INLINE void idDxtEncoder::CompressNormalMapDXT5Fast( const byte *inBuf, byte *outBuf, int width, int height ) {
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CompressNormalMapDXT5Fast_SSE2( inBuf, outBuf, width, height );
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}
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/*
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========================
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idDxtEncoder::CompressNormalMapDXN2Fast
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========================
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*/
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ID_INLINE void idDxtEncoder::CompressNormalMapDXN2Fast( const byte *inBuf, byte *outBuf, int width, int height ) {
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CompressNormalMapDXN2Fast_Generic( inBuf, outBuf, width, height );
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}
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/*
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========================
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idDxtEncoder::EmitByte
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========================
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*/
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ID_INLINE void idDxtEncoder::EmitByte( byte b ) {
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*outData = b;
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outData += 1;
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}
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/*
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========================
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idDxtEncoder::EmitUShort
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========================
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*/
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ID_INLINE void idDxtEncoder::EmitUShort( unsigned short s ) {
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*((unsigned short *)outData) = s;
|
|
outData += 2;
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtEncoder::EmitUInt
|
|
========================
|
|
*/
|
|
ID_INLINE void idDxtEncoder::EmitUInt( unsigned int i ) {
|
|
*((unsigned int *)outData) = i;
|
|
outData += 4;
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtEncoder::AlphaDistance
|
|
========================
|
|
*/
|
|
ID_INLINE unsigned int idDxtEncoder::AlphaDistance( const byte a1, const byte a2 ) const {
|
|
return ( a1 - a2 ) * ( a1 - a2 );
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtEncoder::ColorDistance
|
|
========================
|
|
*/
|
|
ID_INLINE unsigned int idDxtEncoder::ColorDistance( const byte *c1, const byte *c2 ) const {
|
|
return ( ( c1[ 0 ] - c2[ 0 ] ) * ( c1[ 0 ] - c2[ 0 ] ) ) + ( ( c1[ 1 ] - c2[ 1 ] ) * ( c1[ 1 ] - c2[ 1 ] ) ) + ( ( c1[ 2 ] - c2[ 2 ] ) * ( c1[ 2 ] - c2[ 2 ] ) );
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtEncoder::ColorDistanceWeighted
|
|
========================
|
|
*/
|
|
ID_INLINE unsigned int idDxtEncoder::ColorDistanceWeighted( const byte *c1, const byte *c2 ) const {
|
|
int r, g, b;
|
|
int rmean;
|
|
|
|
// http://www.compuphase.com/cmetric.htm
|
|
rmean = ( (int)c1[0] + (int)c2[0] ) / 2;
|
|
r = (int)c1[0] - (int)c2[0];
|
|
g = (int)c1[1] - (int)c2[1];
|
|
b = (int)c1[2] - (int)c2[2];
|
|
return ( ( ( 512 + rmean ) * r * r ) >> 8 ) + 4 * g * g + ( ( ( 767 - rmean ) * b * b ) >> 8 );
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtEncoder::CTX1Distance
|
|
========================
|
|
*/
|
|
ID_INLINE unsigned int idDxtEncoder::CTX1Distance( const byte *c1, const byte *c2 ) const {
|
|
return ( ( c1[ 0 ] - c2[ 0 ] ) * ( c1[ 0 ] - c2[ 0 ] ) ) + ( ( c1[ 1 ] - c2[ 1 ] ) * ( c1[ 1 ] - c2[ 1 ] ) );
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtEncoder::ColorTo565
|
|
========================
|
|
*/
|
|
ID_INLINE unsigned short idDxtEncoder::ColorTo565( const byte *color ) const {
|
|
return ( ( color[ 0 ] >> 3 ) << 11 ) | ( ( color[ 1 ] >> 2 ) << 5 ) | ( color[ 2 ] >> 3 );
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtEncoder::ColorFrom565
|
|
========================
|
|
*/
|
|
ID_INLINE void idDxtEncoder::ColorFrom565( unsigned short c565, byte *color ) const {
|
|
color[0] = byte( ( ( c565 >> 8 ) & ( ( ( 1 << ( 8 - 3 ) ) - 1 ) << 3 ) ) | ( ( c565 >> 13 ) & ((1<<3)-1) ) );
|
|
color[1] = byte( ( ( c565 >> 3 ) & ( ( ( 1 << ( 8 - 2 ) ) - 1 ) << 2 ) ) | ( ( c565 >> 9 ) & ((1<<2)-1) ) );
|
|
color[2] = byte( ( ( c565 << 3 ) & ( ( ( 1 << ( 8 - 3 ) ) - 1 ) << 3 ) ) | ( ( c565 >> 2 ) & ((1<<3)-1) ) );
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtEncoder::ColorTo565
|
|
========================
|
|
*/
|
|
ID_INLINE unsigned short idDxtEncoder::ColorTo565( byte r, byte g, byte b ) const {
|
|
return ( ( r >> 3 ) << 11 ) | ( ( g >> 2 ) << 5 ) | ( b >> 3 );
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtEncoder::GreenFrom565
|
|
========================
|
|
*/
|
|
ID_INLINE byte idDxtEncoder::GreenFrom565( unsigned short c565 ) const {
|
|
byte c = byte( ( c565 & ( ( ( 1 << 6 ) - 1 ) << 5 ) ) >> 3 );
|
|
return ( c | ( c >> 6 ) );
|
|
}
|
|
|
|
/*
|
|
================================================
|
|
idDxtDecoder decodes DXT-compressed Images. Raw output Images are in
|
|
4-byte RGBA format. Raw output NormalMaps are in 4-byte tangent-space NxNyNz format.
|
|
================================================
|
|
*/
|
|
class idDxtDecoder {
|
|
public:
|
|
|
|
// DXT1 decompression (no alpha)
|
|
void DecompressImageDXT1( const byte *inBuf, byte *outBuf, int width, int height );
|
|
|
|
// DXT5 decompression
|
|
void DecompressImageDXT5( const byte *inBuf, byte *outBuf, int width, int height );
|
|
|
|
// DXT5 decompression with nVidia 7x hardware bug
|
|
void DecompressImageDXT5_nVidia7x( const byte *inBuf, byte *outBuf, int width, int height );
|
|
|
|
// CTX1
|
|
void DecompressImageCTX1( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
|
|
|
|
// DXN1
|
|
void DecompressImageDXN1( const byte *inBuf, byte *outBuf, int width, int height ) { /* not implemented */ assert( 0 ); }
|
|
|
|
// YCoCg DXT5 (the output is in CoCg_Y format)
|
|
void DecompressYCoCgDXT5( const byte *inBuf, byte *outBuf, int width, int height );
|
|
|
|
// YCoCg CTX1 + DXT5A (the output is in CoCg_Y format)
|
|
void DecompressYCoCgCTX1DXT5A( const byte *inBuf, byte *outBuf, int width, int height );
|
|
|
|
// tangent space normal map decompression from DXT1 format
|
|
void DecompressNormalMapDXT1( const byte *inBuf, byte *outBuf, int width, int height );
|
|
void DecompressNormalMapDXT1Renormalize( const byte *inBuf, byte *outBuf, int width, int height );
|
|
|
|
// tangent space normal map decompression from DXT5 format
|
|
void DecompressNormalMapDXT5( const byte *inBuf, byte *outBuf, int width, int height );
|
|
void DecompressNormalMapDXT5Renormalize( const byte *inBuf, byte *outBuf, int width, int height );
|
|
|
|
// tangent space normal map decompression from DXN2 format
|
|
void DecompressNormalMapDXN2( const byte *inBuf, byte *outBuf, int width, int height );
|
|
|
|
// decompose a DXT image into indices and two images with colors
|
|
void DecomposeImageDXT1( const byte *inBuf, byte *colorIndices, byte *pic1, byte *pic2, int width, int height );
|
|
void DecomposeImageDXT5( const byte *inBuf, byte *colorIndices, byte *alphaIndices, byte *pic1, byte *pic2, int width, int height );
|
|
|
|
private:
|
|
int width;
|
|
int height;
|
|
const byte * inData;
|
|
|
|
byte ReadByte();
|
|
unsigned short ReadUShort();
|
|
unsigned int ReadUInt();
|
|
unsigned short ColorTo565( const byte *color ) const;
|
|
void ColorFrom565( unsigned short c565, byte *color ) const;
|
|
unsigned short NormalYTo565( byte y ) const;
|
|
byte NormalYFrom565( unsigned short c565 ) const;
|
|
byte NormalScaleFrom565( unsigned short c565 ) const;
|
|
byte NormalBiasFrom565( unsigned short c565 ) const;
|
|
|
|
void EmitBlock( byte *outPtr, int x, int y, const byte *colorBlock );
|
|
void DecodeAlphaValues( byte *colorBlock, const int offset );
|
|
void DecodeColorValues( byte *colorBlock, bool noBlack, bool writeAlpha );
|
|
void DecodeCTX1Values( byte *colorBlock );
|
|
|
|
void DecomposeColorBlock( byte colors[2][4], byte colorIndices[16], bool noBlack );
|
|
void DecomposeAlphaBlock( byte colors[2][4], byte alphaIndices[16] );
|
|
|
|
void DecodeNormalYValues( byte *normalBlock, const int offsetY, byte &bias, byte &scale );
|
|
void DeriveNormalZValues( byte *normalBlock );
|
|
};
|
|
|
|
/*
|
|
========================
|
|
idDxtDecoder::ReadByte
|
|
========================
|
|
*/
|
|
ID_INLINE byte idDxtDecoder::ReadByte() {
|
|
byte b = *inData;
|
|
inData += 1;
|
|
return b;
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtDecoder::ReadUShort
|
|
========================
|
|
*/
|
|
ID_INLINE unsigned short idDxtDecoder::ReadUShort() {
|
|
unsigned short s = *((unsigned short *)inData);
|
|
inData += 2;
|
|
return s;
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtDecoder::ReadUInt
|
|
========================
|
|
*/
|
|
ID_INLINE unsigned int idDxtDecoder::ReadUInt() {
|
|
unsigned int i = *((unsigned int *)inData);
|
|
inData += 4;
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtDecoder::ColorTo565
|
|
========================
|
|
*/
|
|
ID_INLINE unsigned short idDxtDecoder::ColorTo565( const byte *color ) const {
|
|
return ( ( color[ 0 ] >> 3 ) << 11 ) | ( ( color[ 1 ] >> 2 ) << 5 ) | ( color[ 2 ] >> 3 );
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtDecoder::ColorFrom565
|
|
========================
|
|
*/
|
|
ID_INLINE void idDxtDecoder::ColorFrom565( unsigned short c565, byte *color ) const {
|
|
color[0] = byte( ( ( c565 >> 8 ) & ( ( ( 1 << ( 8 - 3 ) ) - 1 ) << 3 ) ) | ( ( c565 >> 13 ) & ((1<<3)-1) ) );
|
|
color[1] = byte( ( ( c565 >> 3 ) & ( ( ( 1 << ( 8 - 2 ) ) - 1 ) << 2 ) ) | ( ( c565 >> 9 ) & ((1<<2)-1) ) );
|
|
color[2] = byte( ( ( c565 << 3 ) & ( ( ( 1 << ( 8 - 3 ) ) - 1 ) << 3 ) ) | ( ( c565 >> 2 ) & ((1<<3)-1) ) );
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtDecoder::NormalYTo565
|
|
========================
|
|
*/
|
|
ID_INLINE unsigned short idDxtDecoder::NormalYTo565( byte y ) const {
|
|
return ( ( y >> 2 ) << 5 );
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtDecoder::NormalYFrom565
|
|
========================
|
|
*/
|
|
ID_INLINE byte idDxtDecoder::NormalYFrom565( unsigned short c565 ) const {
|
|
byte c = byte( ( c565 & ( ( ( 1 << 6 ) - 1 ) << 5 ) ) >> 3 );
|
|
return ( c | ( c >> 6 ) );
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtDecoder::NormalBiasFrom565
|
|
========================
|
|
*/
|
|
ID_INLINE byte idDxtDecoder::NormalBiasFrom565( unsigned short c565 ) const {
|
|
byte c = byte( ( c565 & ( ( ( 1 << 5 ) - 1 ) << 11 ) ) >> 8 );
|
|
return ( c | ( c >> 5 ) );
|
|
}
|
|
|
|
/*
|
|
========================
|
|
idDxtDecoder::NormalScaleFrom565
|
|
========================
|
|
*/
|
|
ID_INLINE byte idDxtDecoder::NormalScaleFrom565( unsigned short c565 ) const {
|
|
byte c = byte( ( c565 & ( ( ( 1 << 5 ) - 1 ) << 0 ) ) << 3 );
|
|
return ( c | ( c >> 5 ) );
|
|
}
|
|
|
|
#endif // !__DXTCODEC_H__
|