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/**
* $Id$
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Contributors: Amorilia (amorilia@gamebox.net)
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
*/
/*
* This file is based on a similar file from the NVIDIA texture tools
* (http://nvidia-texture-tools.googlecode.com/)
*
* Original license from NVIDIA follows.
*/
// Copyright NVIDIA Corporation 2007 -- Ignacio Castano <icastano@nvidia.com>
//
// 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 _DDS_BLOCKDXT_H
#define _DDS_BLOCKDXT_H
#include <Color.h>
#include <ColorBlock.h>
#include <Stream.h>
/// DXT1 block.
struct BlockDXT1
{
Color16 col0;
Color16 col1;
union {
unsigned char row[4];
unsigned int indices;
};
bool isFourColorMode() const;
unsigned int evaluatePalette(Color32 color_array[4]) const;
unsigned int evaluatePaletteFast(Color32 color_array[4]) const;
void evaluatePalette3(Color32 color_array[4]) const;
void evaluatePalette4(Color32 color_array[4]) const;
void decodeBlock(ColorBlock * block) const;
void setIndices(int * idx);
void flip4();
void flip2();
};
/// Return true if the block uses four color mode, false otherwise.
inline bool BlockDXT1::isFourColorMode() const
{
return col0.u >= col1.u; // @@ > or >= ?
}
/// DXT3 alpha block with explicit alpha.
struct AlphaBlockDXT3
{
union {
struct {
unsigned int alpha0 : 4;
unsigned int alpha1 : 4;
unsigned int alpha2 : 4;
unsigned int alpha3 : 4;
unsigned int alpha4 : 4;
unsigned int alpha5 : 4;
unsigned int alpha6 : 4;
unsigned int alpha7 : 4;
unsigned int alpha8 : 4;
unsigned int alpha9 : 4;
unsigned int alphaA : 4;
unsigned int alphaB : 4;
unsigned int alphaC : 4;
unsigned int alphaD : 4;
unsigned int alphaE : 4;
unsigned int alphaF : 4;
};
unsigned short row[4];
};
void decodeBlock(ColorBlock * block) const;
void flip4();
void flip2();
};
/// DXT3 block.
struct BlockDXT3
{
AlphaBlockDXT3 alpha;
BlockDXT1 color;
void decodeBlock(ColorBlock * block) const;
void flip4();
void flip2();
};
/// DXT5 alpha block.
struct AlphaBlockDXT5
{
union {
struct {
unsigned int alpha0 : 8; // 8
unsigned int alpha1 : 8; // 16
unsigned int bits0 : 3; // 3 - 19
unsigned int bits1 : 3; // 6 - 22
unsigned int bits2 : 3; // 9 - 25
unsigned int bits3 : 3; // 12 - 28
unsigned int bits4 : 3; // 15 - 31
unsigned int bits5 : 3; // 18 - 34
unsigned int bits6 : 3; // 21 - 37
unsigned int bits7 : 3; // 24 - 40
unsigned int bits8 : 3; // 27 - 43
unsigned int bits9 : 3; // 30 - 46
unsigned int bitsA : 3; // 33 - 49
unsigned int bitsB : 3; // 36 - 52
unsigned int bitsC : 3; // 39 - 55
unsigned int bitsD : 3; // 42 - 58
unsigned int bitsE : 3; // 45 - 61
unsigned int bitsF : 3; // 48 - 64
};
unsigned long long u;
};
void evaluatePalette(unsigned char alpha[8]) const;
void evaluatePalette8(unsigned char alpha[8]) const;
void evaluatePalette6(unsigned char alpha[8]) const;
void indices(unsigned char index_array[16]) const;
unsigned int index(unsigned int index) const;
void setIndex(unsigned int index, unsigned int value);
void decodeBlock(ColorBlock * block) const;
void flip4();
void flip2();
};
/// DXT5 block.
struct BlockDXT5
{
AlphaBlockDXT5 alpha;
BlockDXT1 color;
void decodeBlock(ColorBlock * block) const;
void flip4();
void flip2();
};
/// ATI1 block.
struct BlockATI1
{
AlphaBlockDXT5 alpha;
void decodeBlock(ColorBlock * block) const;
void flip4();
void flip2();
};
/// ATI2 block.
struct BlockATI2
{
AlphaBlockDXT5 x;
AlphaBlockDXT5 y;
void decodeBlock(ColorBlock * block) const;
void flip4();
void flip2();
};
void mem_read(Stream & mem, BlockDXT1 & block);
void mem_read(Stream & mem, AlphaBlockDXT3 & block);
void mem_read(Stream & mem, BlockDXT3 & block);
void mem_read(Stream & mem, AlphaBlockDXT5 & block);
void mem_read(Stream & mem, BlockDXT5 & block);
void mem_read(Stream & mem, BlockATI1 & block);
void mem_read(Stream & mem, BlockATI2 & block);
#endif // _DDS_BLOCKDXT_H
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