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249 lines
7.2 KiB
C++
249 lines
7.2 KiB
C++
// 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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#pragma once
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#ifndef NV_IMAGE_BLOCKDXT_H
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#define NV_IMAGE_BLOCKDXT_H
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#include "nvimage.h"
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#include "nvmath/Color.h"
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namespace nv
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{
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struct ColorBlock;
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struct ColorSet;
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struct AlphaBlock4x4;
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class Stream;
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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], bool d3d9) const;
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uint evaluatePaletteNV5x(Color32 color_array[4]) const;
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void evaluatePalette3(Color32 color_array[4], bool d3d9) const;
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void evaluatePalette4(Color32 color_array[4], bool d3d9) const;
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void decodeBlock(ColorBlock * block, bool d3d9 = false) 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, bool d3d9 = false) 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, bool d3d9 = false) 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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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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void evaluatePalette(uint8 alpha[8], bool d3d9) const;
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void evaluatePalette8(uint8 alpha[8], bool d3d9) const;
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void evaluatePalette6(uint8 alpha[8], bool d3d9) 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, bool d3d9 = false) const;
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void decodeBlock(AlphaBlock4x4 * block, bool d3d9 = false) 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, bool d3d9 = false) 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, bool d3d9 = false) 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, bool d3d9 = false) 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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/// BC6 block.
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struct BlockBC6
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{
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uint8 data[16]; // Not even going to try to write a union for this thing.
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void decodeBlock(ColorSet * set) const;
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};
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/// BC7 block.
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struct BlockBC7
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{
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uint8 data[16]; // Not even going to try to write a union for this thing.
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void decodeBlock(ColorBlock * block) const;
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};
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// Serialization functions.
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NVIMAGE_API Stream & operator<<(Stream & stream, BlockDXT1 & block);
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NVIMAGE_API Stream & operator<<(Stream & stream, AlphaBlockDXT3 & block);
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NVIMAGE_API Stream & operator<<(Stream & stream, BlockDXT3 & block);
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NVIMAGE_API Stream & operator<<(Stream & stream, AlphaBlockDXT5 & block);
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NVIMAGE_API Stream & operator<<(Stream & stream, BlockDXT5 & block);
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NVIMAGE_API Stream & operator<<(Stream & stream, BlockATI1 & block);
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NVIMAGE_API Stream & operator<<(Stream & stream, BlockATI2 & block);
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NVIMAGE_API Stream & operator<<(Stream & stream, BlockCTX1 & block);
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NVIMAGE_API Stream & operator<<(Stream & stream, BlockBC6 & block);
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NVIMAGE_API Stream & operator<<(Stream & stream, BlockBC7 & block);
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} // nv namespace
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#endif // NV_IMAGE_BLOCKDXT_H
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