275 lines
6.9 KiB
C++
275 lines
6.9 KiB
C++
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Contributors: Amorilia (amorilia@users.sourceforge.net)
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file blender/imbuf/intern/dds/BlockDXT.h
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* \ingroup imbdds
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*/
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/*
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* This file is based on a similar file from the NVIDIA texture tools
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* (http://nvidia-texture-tools.googlecode.com/)
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*
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* Original license from NVIDIA follows.
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*/
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// Copyright NVIDIA Corporation 2007 -- Ignacio Castano <icastano@nvidia.com>
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#ifndef _DDS_BLOCKDXT_H
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#define _DDS_BLOCKDXT_H
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#include <Common.h>
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#include <Color.h>
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#include <ColorBlock.h>
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#include <Stream.h>
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/// DXT1 block.
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struct BlockDXT1
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{
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Color16 col0;
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Color16 col1;
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union {
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uint8 row[4];
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uint indices;
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};
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bool isFourColorMode() const;
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uint evaluatePalette(Color32 color_array[4]) const;
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uint evaluatePaletteNV5x(Color32 color_array[4]) const;
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void evaluatePalette3(Color32 color_array[4]) const;
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void evaluatePalette4(Color32 color_array[4]) const;
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void decodeBlock(ColorBlock * block) const;
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void decodeBlockNV5x(ColorBlock * block) const;
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void setIndices(int * idx);
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void flip4();
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void flip2();
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};
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/// Return true if the block uses four color mode, false otherwise.
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inline bool BlockDXT1::isFourColorMode() const
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{
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return col0.u > col1.u;
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}
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/// DXT3 alpha block with explicit alpha.
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struct AlphaBlockDXT3
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{
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union {
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struct {
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uint alpha0 : 4;
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uint alpha1 : 4;
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uint alpha2 : 4;
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uint alpha3 : 4;
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uint alpha4 : 4;
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uint alpha5 : 4;
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uint alpha6 : 4;
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uint alpha7 : 4;
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uint alpha8 : 4;
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uint alpha9 : 4;
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uint alphaA : 4;
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uint alphaB : 4;
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uint alphaC : 4;
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uint alphaD : 4;
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uint alphaE : 4;
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uint alphaF : 4;
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};
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uint16 row[4];
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};
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void decodeBlock(ColorBlock * block) const;
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void flip4();
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void flip2();
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};
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/// DXT3 block.
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struct BlockDXT3
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{
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AlphaBlockDXT3 alpha;
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BlockDXT1 color;
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void decodeBlock(ColorBlock * block) const;
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void decodeBlockNV5x(ColorBlock * block) const;
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void flip4();
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void flip2();
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};
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/// DXT5 alpha block.
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struct AlphaBlockDXT5
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{
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// uint64 unions do not compile on all platforms
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/*
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union {
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struct {
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uint64 alpha0 : 8; // 8
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uint64 alpha1 : 8; // 16
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uint64 bits0 : 3; // 3 - 19
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uint64 bits1 : 3; // 6 - 22
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uint64 bits2 : 3; // 9 - 25
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uint64 bits3 : 3; // 12 - 28
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uint64 bits4 : 3; // 15 - 31
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uint64 bits5 : 3; // 18 - 34
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uint64 bits6 : 3; // 21 - 37
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uint64 bits7 : 3; // 24 - 40
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uint64 bits8 : 3; // 27 - 43
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uint64 bits9 : 3; // 30 - 46
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uint64 bitsA : 3; // 33 - 49
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uint64 bitsB : 3; // 36 - 52
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uint64 bitsC : 3; // 39 - 55
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uint64 bitsD : 3; // 42 - 58
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uint64 bitsE : 3; // 45 - 61
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uint64 bitsF : 3; // 48 - 64
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};
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uint64 u;
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};
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*/
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uint64 u;
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uint8 alpha0() const { return u & 0xffLL; };
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uint8 alpha1() const { return (u >> 8) & 0xffLL; };
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uint8 bits0() const { return (u >> 16) & 0x7LL; };
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uint8 bits1() const { return (u >> 19) & 0x7LL; };
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uint8 bits2() const { return (u >> 22) & 0x7LL; };
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uint8 bits3() const { return (u >> 25) & 0x7LL; };
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uint8 bits4() const { return (u >> 28) & 0x7LL; };
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uint8 bits5() const { return (u >> 31) & 0x7LL; };
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uint8 bits6() const { return (u >> 34) & 0x7LL; };
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uint8 bits7() const { return (u >> 37) & 0x7LL; };
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uint8 bits8() const { return (u >> 40) & 0x7LL; };
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uint8 bits9() const { return (u >> 43) & 0x7LL; };
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uint8 bitsA() const { return (u >> 46) & 0x7LL; };
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uint8 bitsB() const { return (u >> 49) & 0x7LL; };
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uint8 bitsC() const { return (u >> 52) & 0x7LL; };
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uint8 bitsD() const { return (u >> 55) & 0x7LL; };
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uint8 bitsE() const { return (u >> 58) & 0x7LL; };
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uint8 bitsF() const { return (u >> 61) & 0x7LL; };
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void evaluatePalette(uint8 alpha[8]) const;
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void evaluatePalette8(uint8 alpha[8]) const;
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void evaluatePalette6(uint8 alpha[8]) const;
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void indices(uint8 index_array[16]) const;
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uint index(uint index) const;
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void setIndex(uint index, uint value);
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void decodeBlock(ColorBlock * block) const;
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void flip4();
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void flip2();
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};
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/// DXT5 block.
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struct BlockDXT5
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{
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AlphaBlockDXT5 alpha;
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BlockDXT1 color;
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void decodeBlock(ColorBlock * block) const;
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void decodeBlockNV5x(ColorBlock * block) const;
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void flip4();
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void flip2();
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};
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/// ATI1 block.
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struct BlockATI1
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{
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AlphaBlockDXT5 alpha;
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void decodeBlock(ColorBlock * block) const;
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void flip4();
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void flip2();
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};
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/// ATI2 block.
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struct BlockATI2
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{
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AlphaBlockDXT5 x;
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AlphaBlockDXT5 y;
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void decodeBlock(ColorBlock * block) const;
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void flip4();
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void flip2();
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};
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/// CTX1 block.
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struct BlockCTX1
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{
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uint8 col0[2];
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uint8 col1[2];
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union {
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uint8 row[4];
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uint indices;
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};
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void evaluatePalette(Color32 color_array[4]) const;
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void setIndices(int * idx);
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void decodeBlock(ColorBlock * block) const;
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void flip4();
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void flip2();
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};
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void mem_read(Stream & mem, BlockDXT1 & block);
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void mem_read(Stream & mem, AlphaBlockDXT3 & block);
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void mem_read(Stream & mem, BlockDXT3 & block);
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void mem_read(Stream & mem, AlphaBlockDXT5 & block);
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void mem_read(Stream & mem, BlockDXT5 & block);
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void mem_read(Stream & mem, BlockATI1 & block);
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void mem_read(Stream & mem, BlockATI2 & block);
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void mem_read(Stream & mem, BlockCTX1 & block);
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#endif // _DDS_BLOCKDXT_H
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