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/*
* $Id$
*
* ***** BEGIN GPL 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.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Contributors: Amorilia (amorilia@users.sourceforge.net)
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/imbuf/intern/dds/BlockDXT.h
* \ingroup imbdds
*/
/*
* 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 <Common.h>
#include <Color.h>
#include <ColorBlock.h>
#include <Stream.h>
/// DXT1 block.
struct BlockDXT1
{
Color16 col0;
Color16 col1;
union {
uint8 row[4];
uint indices;
};
bool isFourColorMode() const;
uint evaluatePalette(Color32 color_array[4]) const;
uint 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;
}
/// DXT3 alpha block with explicit alpha.
struct AlphaBlockDXT3
{
union {
struct {
uint alpha0 : 4;
uint alpha1 : 4;
uint alpha2 : 4;
uint alpha3 : 4;
uint alpha4 : 4;
uint alpha5 : 4;
uint alpha6 : 4;
uint alpha7 : 4;
uint alpha8 : 4;
uint alpha9 : 4;
uint alphaA : 4;
uint alphaB : 4;
uint alphaC : 4;
uint alphaD : 4;
uint alphaE : 4;
uint alphaF : 4;
};
uint16 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
{
// uint64 unions do not compile on all platforms
/*
union {
struct {
uint64 alpha0 : 8; // 8
uint64 alpha1 : 8; // 16
uint64 bits0 : 3; // 3 - 19
uint64 bits1 : 3; // 6 - 22
uint64 bits2 : 3; // 9 - 25
uint64 bits3 : 3; // 12 - 28
uint64 bits4 : 3; // 15 - 31
uint64 bits5 : 3; // 18 - 34
uint64 bits6 : 3; // 21 - 37
uint64 bits7 : 3; // 24 - 40
uint64 bits8 : 3; // 27 - 43
uint64 bits9 : 3; // 30 - 46
uint64 bitsA : 3; // 33 - 49
uint64 bitsB : 3; // 36 - 52
uint64 bitsC : 3; // 39 - 55
uint64 bitsD : 3; // 42 - 58
uint64 bitsE : 3; // 45 - 61
uint64 bitsF : 3; // 48 - 64
};
uint64 u;
};
*/
uint64 u;
uint8 alpha0() const { return u & 0xffLL; };
uint8 alpha1() const { return (u >> 8) & 0xffLL; };
uint8 bits0() const { return (u >> 16) & 0x7LL; };
uint8 bits1() const { return (u >> 19) & 0x7LL; };
uint8 bits2() const { return (u >> 22) & 0x7LL; };
uint8 bits3() const { return (u >> 25) & 0x7LL; };
uint8 bits4() const { return (u >> 28) & 0x7LL; };
uint8 bits5() const { return (u >> 31) & 0x7LL; };
uint8 bits6() const { return (u >> 34) & 0x7LL; };
uint8 bits7() const { return (u >> 37) & 0x7LL; };
uint8 bits8() const { return (u >> 40) & 0x7LL; };
uint8 bits9() const { return (u >> 43) & 0x7LL; };
uint8 bitsA() const { return (u >> 46) & 0x7LL; };
uint8 bitsB() const { return (u >> 49) & 0x7LL; };
uint8 bitsC() const { return (u >> 52) & 0x7LL; };
uint8 bitsD() const { return (u >> 55) & 0x7LL; };
uint8 bitsE() const { return (u >> 58) & 0x7LL; };
uint8 bitsF() const { return (u >> 61) & 0x7LL; };
void evaluatePalette(uint8 alpha[8]) const;
void evaluatePalette8(uint8 alpha[8]) const;
void evaluatePalette6(uint8 alpha[8]) const;
void indices(uint8 index_array[16]) const;
uint index(uint index) const;
void setIndex(uint index, uint 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();
};
/// CTX1 block.
struct BlockCTX1
{
uint8 col0[2];
uint8 col1[2];
union {
uint8 row[4];
uint indices;
};
void evaluatePalette(Color32 color_array[4]) const;
void setIndices(int * idx);
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);
void mem_read(Stream & mem, BlockCTX1 & block);
#endif // _DDS_BLOCKDXT_H
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