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68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
/******************************************************************************
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* Fast DXT - a realtime DXT compression tool
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*
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* Author : Luc Renambot
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*
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* Copyright (C) 2007 Electronic Visualization Laboratory,
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* University of Illinois at Chicago
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either Version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser Public License along
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* with this library; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*****************************************************************************/
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// From:
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// Real-Time DXT Compression
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// May 20th 2006 J.M.P. van Waveren
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// (c) 2006, Id Software, Inc.
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <math.h>
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typedef unsigned char byte;
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typedef unsigned short word;
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typedef unsigned int dword;
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#define C565_5_MASK 0xF8 // 0xFF minus last three bits
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#define C565_6_MASK 0xFC // 0xFF minus last two bits
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#define INSET_SHIFT 4 // inset the bounding box with ( range >> shift )
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#if !defined(MAX_INT)
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#define MAX_INT 2147483647 /* max value for an int 32 */
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#define MIN_INT (-2147483647-1) /* min value for an int 32 */
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#endif
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#if defined(__GNUC__)
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#define ALIGN16(_x) _x __attribute((aligned(16)))
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#else
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#define ALIGN16( x ) __declspec(align(16)) x
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#endif
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// Compress to DXT1 format
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void CompressImageDXT1( const byte *inBuf, byte *outBuf, int width, int height, int &outputBytes );
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// Compress to DXT5 format
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void CompressImageDXT5( const byte *inBuf, byte *outBuf, int width, int height, int &outputBytes );
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// Compress to DXT5 format, first convert to YCoCg color space
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void CompressImageDXT5YCoCg( const byte *inBuf, byte *outBuf, int width, int height, int &outputBytes );
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// Compute error between two images
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double ComputeError( const byte *original, const byte *dxt, int width, int height);
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