//! \file Bc7Decoder.cs //! \date 2022 May 03 //! \brief BC7 texture compression decoder. // // Based on the [bc7enc](https://github.com/richgel999/bc7enc) // // Copyright(c) 2020 Richard Geldreich, Jr. // // C# port copyright (C) 2022 by morkt // // 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. using System; using GameRes.Utility; namespace GameRes.Formats.Unity { public class Bc7Decoder { byte[] m_input; int m_width; int m_height; int m_output_stride; byte[] m_output; byte[] m_block = new byte[64]; public Bc7Decoder (byte[] input, ImageMetaData info) { m_input = input; m_width = info.iWidth; m_output_stride = m_width * 4; m_height = info.iHeight; m_output = new byte[m_output_stride*m_height]; } public byte[] Unpack () { int block_step_y = m_output_stride * 4; int block_step_x = 16; int src = 0; for (int y = 0; y < m_output.Length; y += block_step_y) for (int x = 0; x < m_output_stride; x += block_step_x) { DecompressBc7Block (src); int dst = y + x; int block_src = 0; for (int i = 0; i < 4; ++i) { int row_dst = dst; for (int j = 0; j < 4; ++j) { m_output[row_dst++] = m_block[block_src+2]; m_output[row_dst++] = m_block[block_src+1]; m_output[row_dst++] = m_block[block_src ]; m_output[row_dst++] = m_block[block_src+3]; block_src += 4; } dst += m_output_stride; } src += 16; } return m_output; } private bool DecompressBc7Block (int src) { byte first_byte = m_input[src]; for (int mode = 0; mode < 8; ++mode) { if ((first_byte & (1u << mode)) != 0) { switch (mode) { case 0: case 2: return UnpackBc7Mode0_2 (mode, src); case 1: case 3: case 7: return UnpackBc7Mode1_3_7 (mode, src); case 4: case 5: return UnpackBc7Mode4_5 (mode, src); case 6: return UnpackBc7Mode6 (src); } } } return false; } int m_bit_offset; uint ReadBits32 (int src, int codesize) { uint bits = 0; int total_bits = 0; while (total_bits < codesize) { int byte_bit_offset = m_bit_offset & 7; int bits_to_read = Math.Min (codesize - total_bits, 8 - byte_bit_offset); uint byte_bits = (uint)m_input[src + (m_bit_offset >> 3)] >> byte_bit_offset; byte_bits &= ((1u << bits_to_read) - 1u); bits |= (byte_bits << total_bits); total_bits += bits_to_read; m_bit_offset += bits_to_read; } return bits; } byte[] endpoints = new byte[8 * 4]; uint[] pbits = new uint[6]; uint[] weights = new uint[16]; uint[] a_weights = new uint[16]; int[] weight_bits = new int[2]; byte[,] block_colors= new byte[3,32]; bool UnpackBc7Mode0_2 (int mode, int src) { const uint ENDPOINTS = 6; const uint COMPS = 3; int WEIGHT_BITS = (mode == 0) ? 3 : 2; int ENDPOINT_BITS = (mode == 0) ? 4 : 5; int PBITS = (mode == 0) ? 6 : 0; uint WEIGHT_VALS = 1u << WEIGHT_BITS; m_bit_offset = 0; if (ReadBits32 (src, mode + 1) != (1u << mode)) return false; uint part = ReadBits32 (src, (mode == 0) ? 4 : 6); for (uint c = 0; c < COMPS; c++) for (uint e = 0; e < ENDPOINTS * 4; e += 4) endpoints[e+c] = (byte)ReadBits32(src, ENDPOINT_BITS); for (uint p = 0; p < PBITS; p++) pbits[p] = ReadBits32 (src, 1); for (uint i = 0; i < 16; i++) weights[i] = ReadBits32 (src, ((i == 0) || (i == s_bc7_table_anchor_index_third_subset_1[part]) || (i == s_bc7_table_anchor_index_third_subset_2[part])) ? (WEIGHT_BITS - 1) : WEIGHT_BITS); for (uint e = 0; e < ENDPOINTS * 4; e += 4) for (uint c = 0; c < 4; c++) endpoints[e+c] = (byte)((c == 3) ? 0xFF : (PBITS != 0 ? bc7_dequant(endpoints[e+c], pbits[e/4], ENDPOINT_BITS) : bc7_dequant(endpoints[e+c], ENDPOINT_BITS))); for (uint s = 0; s < 3; s++) for (uint i = 0; i < WEIGHT_VALS*4; i += 4) { for (uint c = 0; c < 3; c++) block_colors[s,i+c] = (byte)bc7_interp(endpoints[s * 8 + c], endpoints[s * 8 + 4 + c], i/4, WEIGHT_BITS); block_colors[s,i+3] = 0xFF; } for (uint i = 0; i < 16*4; i += 4) { int b = s_bc7_partition3[part * 16 + i/4]; uint c = weights[i/4] * 4; m_block[i ] = block_colors[b,c]; m_block[i+1] = block_colors[b,c+1]; m_block[i+2] = block_colors[b,c+2]; m_block[i+3] = block_colors[b,c+3]; } return true; } bool UnpackBc7Mode1_3_7 (int mode, int src) { const uint ENDPOINTS = 4; int COMPS = (mode == 7) ? 4 : 3; int WEIGHT_BITS = (mode == 1) ? 3 : 2; int ENDPOINT_BITS = (mode == 7) ? 5 : ((mode == 1) ? 6 : 7); int PBITS = (mode == 1) ? 2 : 4; bool SHARED_PBITS = mode == 1; uint WEIGHT_VALS = 1u << WEIGHT_BITS; m_bit_offset = 0; if (ReadBits32 (src, mode + 1) != (1u << mode)) return false; uint part = ReadBits32 (src, 6); for (uint c = 0; c < COMPS; c++) for (uint e = 0; e < ENDPOINTS * 4; e += 4) endpoints[e+c] = (byte)ReadBits32(src, ENDPOINT_BITS); for (uint p = 0; p < PBITS; p++) pbits[p] = ReadBits32 (src, 1); for (uint i = 0; i < 16; i++) weights[i] = ReadBits32(src, ((i == 0) || (i == s_bc7_table_anchor_index_second_subset[part])) ? (WEIGHT_BITS - 1) : WEIGHT_BITS); for (uint e = 0; e < ENDPOINTS*4; e += 4) for (uint c = 0; c < 4; c++) endpoints[e+c] = (byte)((c == ((mode == 7u) ? 4u : 3u)) ? 0xFF : bc7_dequant(endpoints[e+c], pbits[SHARED_PBITS ? ((e/4) >> 1) : (e/4)], ENDPOINT_BITS)); for (uint s = 0; s < 2; s++) for (uint i = 0; i < WEIGHT_VALS*4; i += 4) { for (uint c = 0; c < COMPS; c++) block_colors[s,i+c] = (byte)bc7_interp(endpoints[(s * 2)*4+c], endpoints[(s * 2 + 1)*4+c], i/4, WEIGHT_BITS); block_colors[s,i+3] = (COMPS == 3) ? (byte)0xFF : block_colors[s,i+3]; } for (uint i = 0; i < 16*4; i += 4) { int b = s_bc7_partition2[part * 16 + i/4]; uint c = weights[i/4] * 4; m_block[i ] = block_colors[b,c]; m_block[i+1] = block_colors[b,c+1]; m_block[i+2] = block_colors[b,c+2]; m_block[i+3] = block_colors[b,c+3]; } return true; } bool UnpackBc7Mode4_5 (int mode, int src) { const uint ENDPOINTS = 2; const uint COMPS = 4; const int WEIGHT_BITS = 2; int A_WEIGHT_BITS = (mode == 4) ? 3 : 2; int ENDPOINT_BITS = (mode == 4) ? 5 : 7; int A_ENDPOINT_BITS = (mode == 4) ? 6 : 8; m_bit_offset = 0; if (ReadBits32(src, mode + 1) != (1u << mode)) return false; uint comp_rot = ReadBits32 (src, 2); uint index_mode = (mode == 4) ? ReadBits32 (src, 1) : 0; for (uint c = 0; c < COMPS; c++) for (uint e = 0; e < ENDPOINTS*4; e += 4) endpoints[e+c] = (byte)ReadBits32(src, (c == 3) ? A_ENDPOINT_BITS : ENDPOINT_BITS); weight_bits[0] = index_mode != 0 ? A_WEIGHT_BITS : WEIGHT_BITS; weight_bits[1] = index_mode != 0 ? WEIGHT_BITS : A_WEIGHT_BITS; uint[] w_array = index_mode != 0 ? a_weights : weights; for (uint i = 0; i < 16; i++) w_array[i] = ReadBits32 (src, weight_bits[index_mode] - ((i == 0) ? 1 : 0)); w_array = index_mode != 0 ? weights : a_weights; for (uint i = 0; i < 16; i++) w_array[i] = ReadBits32 (src, weight_bits[1 - index_mode] - ((i == 0) ? 1 : 0)); for (uint e = 0; e < ENDPOINTS*4; e += 4) for (uint c = 0; c < 4; c++) endpoints[e+c] = (byte)bc7_dequant(endpoints[e+c], (c == 3) ? A_ENDPOINT_BITS : ENDPOINT_BITS); for (uint i = 0; i < (1U << weight_bits[0]) * 4; i += 4) for (uint c = 0; c < 3; c++) block_colors[0,i+c] = (byte)bc7_interp(endpoints[c], endpoints[4+c], i/4, weight_bits[0]); for (uint i = 0; i < (1U << weight_bits[1]) * 4; i += 4) block_colors[0,i+3] = (byte)bc7_interp(endpoints[3], endpoints[4+3], i/4, weight_bits[1]); for (uint i = 0; i < 16*4; i += 4) { uint w = weights[i / 4] * 4; m_block[i ] = block_colors[0,w]; m_block[i+1] = block_colors[0,w+1]; m_block[i+2] = block_colors[0,w+2]; m_block[i+3] = block_colors[0,a_weights[i/4]*4+3]; if (comp_rot >= 1) { byte a = m_block[i+3]; m_block[i+3] = m_block[i+comp_rot-1]; m_block[i+comp_rot-1] = a; } } return true; } internal class Bc7Mode_6 { public struct Lo { public byte mode ; //: 7; public byte r0 ; //: 7; public byte r1 ; //: 7; public byte g0 ; //: 7; public byte g1 ; //: 7; public byte b0 ; //: 7; public byte b1 ; //: 7; public byte a0 ; //: 7; public byte a1 ; //: 7; public byte p0 ; //: 1; } public struct Hi { public byte p1 ; //: 1; public byte s00 ; //: 3; public byte s10 ; //: 4; public byte s20 ; //: 4; public byte s30 ; //: 4; public byte s01 ; //: 4; public byte s11 ; //: 4; public byte s21 ; //: 4; public byte s31 ; //: 4; public byte s02 ; //: 4; public byte s12 ; //: 4; public byte s22 ; //: 4; public byte s32 ; //: 4; public byte s03 ; //: 4; public byte s13 ; //: 4; public byte s23 ; //: 4; public byte s33 ; //: 4; } public Lo m_lo; public Hi m_hi; public void Unpack (byte[] input, int src) { ulong lo_bits = input.ToUInt64 (src); ulong hi_bits = input.ToUInt64 (src+8); m_lo.mode = (byte)( lo_bits & 0x7F); m_lo.r0 = (byte)((lo_bits >> 7) & 0x7F); m_lo.r1 = (byte)((lo_bits >> 14) & 0x7F); m_lo.g0 = (byte)((lo_bits >> 21) & 0x7F); m_lo.g1 = (byte)((lo_bits >> 28) & 0x7F); m_lo.b0 = (byte)((lo_bits >> 35) & 0x7F); m_lo.b1 = (byte)((lo_bits >> 42) & 0x7F); m_lo.a0 = (byte)((lo_bits >> 49) & 0x7F); m_lo.a1 = (byte)((lo_bits >> 56) & 0x7F); m_lo.p0 = (byte)((lo_bits >> 63)); m_hi.p1 = (byte)((hi_bits & 1)); m_hi.s00 = (byte)((hi_bits >> 1) & 0x7); m_hi.s10 = (byte)((hi_bits >> 4) & 0xF); m_hi.s20 = (byte)((hi_bits >> 8) & 0xF); m_hi.s30 = (byte)((hi_bits >> 12) & 0xF); m_hi.s01 = (byte)((hi_bits >> 16) & 0xF); m_hi.s11 = (byte)((hi_bits >> 20) & 0xF); m_hi.s21 = (byte)((hi_bits >> 24) & 0xF); m_hi.s31 = (byte)((hi_bits >> 28) & 0xF); m_hi.s02 = (byte)((hi_bits >> 32) & 0xF); m_hi.s12 = (byte)((hi_bits >> 36) & 0xF); m_hi.s22 = (byte)((hi_bits >> 40) & 0xF); m_hi.s32 = (byte)((hi_bits >> 44) & 0xF); m_hi.s03 = (byte)((hi_bits >> 48) & 0xF); m_hi.s13 = (byte)((hi_bits >> 52) & 0xF); m_hi.s23 = (byte)((hi_bits >> 56) & 0xF); m_hi.s33 = (byte)((hi_bits >> 60)); } } Bc7Mode_6 mode_6_block = new Bc7Mode_6(); uint[] vals = new uint[16]; bool UnpackBc7Mode6(int src) { mode_6_block.Unpack (m_input, src); var block = mode_6_block; if (block.m_lo.mode != (1 << 6)) return false; uint r0 = (uint)((block.m_lo.r0 << 1) | block.m_lo.p0); uint g0 = (uint)((block.m_lo.g0 << 1) | block.m_lo.p0); uint b0 = (uint)((block.m_lo.b0 << 1) | block.m_lo.p0); uint a0 = (uint)((block.m_lo.a0 << 1) | block.m_lo.p0); uint r1 = (uint)((block.m_lo.r1 << 1) | block.m_hi.p1); uint g1 = (uint)((block.m_lo.g1 << 1) | block.m_hi.p1); uint b1 = (uint)((block.m_lo.b1 << 1) | block.m_hi.p1); uint a1 = (uint)((block.m_lo.a1 << 1) | block.m_hi.p1); for (int i = 0; i < 16; i++) { uint w = s_bc7_weights4[i]; uint iw = 64 - w; SetNoclampRgba(vals, i, (r0 * iw + r1 * w + 32u) >> 6, (g0 * iw + g1 * w + 32u) >> 6, (b0 * iw + b1 * w + 32u) >> 6, (a0 * iw + a1 * w + 32u) >> 6); } LittleEndian.Pack (vals[block.m_hi.s00], m_block, 0); LittleEndian.Pack (vals[block.m_hi.s10], m_block, 4); LittleEndian.Pack (vals[block.m_hi.s20], m_block, 8); LittleEndian.Pack (vals[block.m_hi.s30], m_block, 12); LittleEndian.Pack (vals[block.m_hi.s01], m_block, 16); LittleEndian.Pack (vals[block.m_hi.s11], m_block, 20); LittleEndian.Pack (vals[block.m_hi.s21], m_block, 24); LittleEndian.Pack (vals[block.m_hi.s31], m_block, 28); LittleEndian.Pack (vals[block.m_hi.s02], m_block, 32); LittleEndian.Pack (vals[block.m_hi.s12], m_block, 36); LittleEndian.Pack (vals[block.m_hi.s22], m_block, 40); LittleEndian.Pack (vals[block.m_hi.s32], m_block, 44); LittleEndian.Pack (vals[block.m_hi.s03], m_block, 48); LittleEndian.Pack (vals[block.m_hi.s13], m_block, 52); LittleEndian.Pack (vals[block.m_hi.s23], m_block, 56); LittleEndian.Pack (vals[block.m_hi.s33], m_block, 60); return true; } static void SetNoclampRgba (uint[] vals, int dst, uint sr, uint sg, uint sb, uint sa) { vals[dst] = (sr & 0xFF) | ((sg & 0xFF) << 8) | ((sb & 0xFF) << 16) | ((sa & 0xFF) << 24); } static uint bc7_dequant (uint val, uint pbit, int val_bits) { int total_bits = val_bits + 1; val = (val << 1) | pbit; val <<= (8 - total_bits); val |= (val >> total_bits); return val; } static uint bc7_dequant (uint val, int val_bits) { val <<= (8 - val_bits); val |= (val >> val_bits); return val; } static uint bc7_interp2 (uint l, uint h, uint w) { return (l * (64 - s_bc7_weights2[w]) + h * s_bc7_weights2[w] + 32) >> 6; } static uint bc7_interp3 (uint l, uint h, uint w) { return (l * (64 - s_bc7_weights3[w]) + h * s_bc7_weights3[w] + 32) >> 6; } static uint bc7_interp4 (uint l, uint h, uint w) { return (l * (64 - s_bc7_weights4[w]) + h * s_bc7_weights4[w] + 32) >> 6; } static uint bc7_interp (uint l, uint h, uint w, int bits) { switch (bits) { case 2: return bc7_interp2 (l, h, w); case 3: return bc7_interp3 (l, h, w); case 4: return bc7_interp4 (l, h, w); default: return 0; } } static readonly uint[] s_bc7_weights2 = { 0, 21, 43, 64 }; static readonly uint[] s_bc7_weights3 = { 0, 9, 18, 27, 37, 46, 55, 64 }; static readonly uint[] s_bc7_weights4 = { 0, 4, 9, 13, 17, 21, 26, 30, 34, 38, 43, 47, 51, 55, 60, 64 }; static readonly byte[] s_bc7_partition2 = { 0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1, 0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1, 0,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1, 0,0,0,1,0,0,1,1,0,0,1,1,0,1,1,1, 0,0,0,0,0,0,0,1,0,0,0,1,0,0,1,1, 0,0,1,1,0,1,1,1,0,1,1,1,1,1,1,1, 0,0,0,1,0,0,1,1,0,1,1,1,1,1,1,1, 0,0,0,0,0,0,0,1,0,0,1,1,0,1,1,1, 0,0,0,0,0,0,0,0,0,0,0,1,0,0,1,1, 0,0,1,1,0,1,1,1,1,1,1,1,1,1,1,1, 0,0,0,0,0,0,0,1,0,1,1,1,1,1,1,1, 0,0,0,0,0,0,0,0,0,0,0,1,0,1,1,1, 0,0,0,1,0,1,1,1,1,1,1,1,1,1,1,1, 0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1, 0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1, 0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1, 0,0,0,0,1,0,0,0,1,1,1,0,1,1,1,1, 0,1,1,1,0,0,0,1,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,1,0,0,0,1,1,1,0, 0,1,1,1,0,0,1,1,0,0,0,1,0,0,0,0, 0,0,1,1,0,0,0,1,0,0,0,0,0,0,0,0, 0,0,0,0,1,0,0,0,1,1,0,0,1,1,1,0, 0,0,0,0,0,0,0,0,1,0,0,0,1,1,0,0, 0,1,1,1,0,0,1,1,0,0,1,1,0,0,0,1, 0,0,1,1,0,0,0,1,0,0,0,1,0,0,0,0, 0,0,0,0,1,0,0,0,1,0,0,0,1,1,0,0, 0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0, 0,0,1,1,0,1,1,0,0,1,1,0,1,1,0,0, 0,0,0,1,0,1,1,1,1,1,1,0,1,0,0,0, 0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0, 0,1,1,1,0,0,0,1,1,0,0,0,1,1,1,0, 0,0,1,1,1,0,0,1,1,0,0,1,1,1,0,0, 0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1, 0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1, 0,1,0,1,1,0,1,0,0,1,0,1,1,0,1,0, 0,0,1,1,0,0,1,1,1,1,0,0,1,1,0,0, 0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0, 0,1,0,1,0,1,0,1,1,0,1,0,1,0,1,0, 0,1,1,0,1,0,0,1,0,1,1,0,1,0,0,1, 0,1,0,1,1,0,1,0,1,0,1,0,0,1,0,1, 0,1,1,1,0,0,1,1,1,1,0,0,1,1,1,0, 0,0,0,1,0,0,1,1,1,1,0,0,1,0,0,0, 0,0,1,1,0,0,1,0,0,1,0,0,1,1,0,0, 0,0,1,1,1,0,1,1,1,1,0,1,1,1,0,0, 0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0, 0,0,1,1,1,1,0,0,1,1,0,0,0,0,1,1, 0,1,1,0,0,1,1,0,1,0,0,1,1,0,0,1, 0,0,0,0,0,1,1,0,0,1,1,0,0,0,0,0, 0,1,0,0,1,1,1,0,0,1,0,0,0,0,0,0, 0,0,1,0,0,1,1,1,0,0,1,0,0,0,0,0, 0,0,0,0,0,0,1,0,0,1,1,1,0,0,1,0, 0,0,0,0,0,1,0,0,1,1,1,0,0,1,0,0, 0,1,1,0,1,1,0,0,1,0,0,1,0,0,1,1, 0,0,1,1,0,1,1,0,1,1,0,0,1,0,0,1, 0,1,1,0,0,0,1,1,1,0,0,1,1,1,0,0, 0,0,1,1,1,0,0,1,1,1,0,0,0,1,1,0, 0,1,1,0,1,1,0,0,1,1,0,0,1,0,0,1, 0,1,1,0,0,0,1,1,0,0,1,1,1,0,0,1, 0,1,1,1,1,1,1,0,1,0,0,0,0,0,0,1, 0,0,0,1,1,0,0,0,1,1,1,0,0,1,1,1, 0,0,0,0,1,1,1,1,0,0,1,1,0,0,1,1, 0,0,1,1,0,0,1,1,1,1,1,1,0,0,0,0, 0,0,1,0,0,0,1,0,1,1,1,0,1,1,1,0, 0,1,0,0,0,1,0,0,0,1,1,1,0,1,1,1 }; static readonly byte[] s_bc7_partition3 = { 0,0,1,1,0,0,1,1,0,2,2,1,2,2,2,2, 0,0,0,1,0,0,1,1,2,2,1,1,2,2,2,1, 0,0,0,0,2,0,0,1,2,2,1,1,2,2,1,1, 0,2,2,2,0,0,2,2,0,0,1,1,0,1,1,1, 0,0,0,0,0,0,0,0,1,1,2,2,1,1,2,2, 0,0,1,1,0,0,1,1,0,0,2,2,0,0,2,2, 0,0,2,2,0,0,2,2,1,1,1,1,1,1,1,1, 0,0,1,1,0,0,1,1,2,2,1,1,2,2,1,1, 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2, 0,0,0,0,1,1,1,1,1,1,1,1,2,2,2,2, 0,0,0,0,1,1,1,1,2,2,2,2,2,2,2,2, 0,0,1,2,0,0,1,2,0,0,1,2,0,0,1,2, 0,1,1,2,0,1,1,2,0,1,1,2,0,1,1,2, 0,1,2,2,0,1,2,2,0,1,2,2,0,1,2,2, 0,0,1,1,0,1,1,2,1,1,2,2,1,2,2,2, 0,0,1,1,2,0,0,1,2,2,0,0,2,2,2,0, 0,0,0,1,0,0,1,1,0,1,1,2,1,1,2,2, 0,1,1,1,0,0,1,1,2,0,0,1,2,2,0,0, 0,0,0,0,1,1,2,2,1,1,2,2,1,1,2,2, 0,0,2,2,0,0,2,2,0,0,2,2,1,1,1,1, 0,1,1,1,0,1,1,1,0,2,2,2,0,2,2,2, 0,0,0,1,0,0,0,1,2,2,2,1,2,2,2,1, 0,0,0,0,0,0,1,1,0,1,2,2,0,1,2,2, 0,0,0,0,1,1,0,0,2,2,1,0,2,2,1,0, 0,1,2,2,0,1,2,2,0,0,1,1,0,0,0,0, 0,0,1,2,0,0,1,2,1,1,2,2,2,2,2,2, 0,1,1,0,1,2,2,1,1,2,2,1,0,1,1,0, 0,0,0,0,0,1,1,0,1,2,2,1,1,2,2,1, 0,0,2,2,1,1,0,2,1,1,0,2,0,0,2,2, 0,1,1,0,0,1,1,0,2,0,0,2,2,2,2,2, 0,0,1,1,0,1,2,2,0,1,2,2,0,0,1,1, 0,0,0,0,2,0,0,0,2,2,1,1,2,2,2,1, 0,0,0,0,0,0,0,2,1,1,2,2,1,2,2,2, 0,2,2,2,0,0,2,2,0,0,1,2,0,0,1,1, 0,0,1,1,0,0,1,2,0,0,2,2,0,2,2,2, 0,1,2,0,0,1,2,0,0,1,2,0,0,1,2,0, 0,0,0,0,1,1,1,1,2,2,2,2,0,0,0,0, 0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,0, 0,1,2,0,2,0,1,2,1,2,0,1,0,1,2,0, 0,0,1,1,2,2,0,0,1,1,2,2,0,0,1,1, 0,0,1,1,1,1,2,2,2,2,0,0,0,0,1,1, 0,1,0,1,0,1,0,1,2,2,2,2,2,2,2,2, 0,0,0,0,0,0,0,0,2,1,2,1,2,1,2,1, 0,0,2,2,1,1,2,2,0,0,2,2,1,1,2,2, 0,0,2,2,0,0,1,1,0,0,2,2,0,0,1,1, 0,2,2,0,1,2,2,1,0,2,2,0,1,2,2,1, 0,1,0,1,2,2,2,2,2,2,2,2,0,1,0,1, 0,0,0,0,2,1,2,1,2,1,2,1,2,1,2,1, 0,1,0,1,0,1,0,1,0,1,0,1,2,2,2,2, 0,2,2,2,0,1,1,1,0,2,2,2,0,1,1,1, 0,0,0,2,1,1,1,2,0,0,0,2,1,1,1,2, 0,0,0,0,2,1,1,2,2,1,1,2,2,1,1,2, 0,2,2,2,0,1,1,1,0,1,1,1,0,2,2,2, 0,0,0,2,1,1,1,2,1,1,1,2,0,0,0,2, 0,1,1,0,0,1,1,0,0,1,1,0,2,2,2,2, 0,0,0,0,0,0,0,0,2,1,1,2,2,1,1,2, 0,1,1,0,0,1,1,0,2,2,2,2,2,2,2,2, 0,0,2,2,0,0,1,1,0,0,1,1,0,0,2,2, 0,0,2,2,1,1,2,2,1,1,2,2,0,0,2,2, 0,0,0,0,0,0,0,0,0,0,0,0,2,1,1,2, 0,0,0,2,0,0,0,1,0,0,0,2,0,0,0,1, 0,2,2,2,1,2,2,2,0,2,2,2,1,2,2,2, 0,1,0,1,2,2,2,2,2,2,2,2,2,2,2,2, 0,1,1,1,2,0,1,1,2,2,0,1,2,2,2,0, }; static readonly byte[] s_bc7_table_anchor_index_second_subset = { 15,15,15,15,15,15,15,15, 15,15,15,15,15,15,15,15, 15, 2, 8, 2, 2, 8, 8,15, 2, 8, 2, 2, 8, 8, 2, 2, 15,15, 6, 8, 2, 8,15,15, 2, 8, 2, 2, 2,15,15, 6, 6, 2, 6, 8,15,15, 2, 2, 15,15,15,15,15, 2, 2,15 }; static readonly byte[] s_bc7_table_anchor_index_third_subset_1 = { 3, 3,15,15, 8, 3,15,15, 8, 8, 6, 6, 6, 5, 3, 3, 3, 3, 8,15, 3, 3, 6,10, 5, 8, 8, 6, 8, 5,15,15, 8,15, 3, 5, 6,10, 8,15, 15, 3,15, 5,15,15,15,15, 3,15, 5, 5, 5, 8, 5,10, 5,10, 8,13,15,12, 3, 3 }; static readonly byte[] s_bc7_table_anchor_index_third_subset_2 = { 15, 8, 8, 3,15,15, 3, 8, 15,15,15,15,15,15,15, 8, 15, 8,15, 3,15, 8,15, 8, 3,15, 6,10,15,15,10, 8, 15, 3,15,10,10, 8, 9,10, 6,15, 8,15, 3, 6, 6, 8, 15, 3,15,15,15,15,15,15, 15,15,15,15, 3,15,15, 8 }; } }