| // Lookup tables for the ASTC decoder |
| |
| // Number of trits, quints and bits that are used to encode the weights. |
| // Refer to "Table C.2.7 - Weight Range Encodings" |
| const uvec3 kWeightEncodings[] = { |
| {0, 0, 0}, {0, 0, 0}, {0, 0, 1}, {1, 0, 0}, {0, 0, 2}, {0, 1, 0}, {1, 0, 1}, {0, 0, 3}, |
| {0, 0, 0}, {0, 0, 0}, {0, 1, 1}, {1, 0, 2}, {0, 0, 4}, {0, 1, 2}, {1, 0, 3}, {0, 0, 5}, |
| }; |
| |
| // Number of trits, quints, and bits that we are used to encode the color endpoints, sorted from |
| // largest to smallest. This is the data from "Table C.2.16", but with the addition of encodings |
| // that use only bits. |
| const uvec3 kColorEncodings[] = { |
| {0, 0, 8}, // 255 |
| {1, 0, 6}, // 191 |
| {0, 1, 5}, // 159 |
| {0, 0, 7}, // 127 |
| {1, 0, 5}, // 95 |
| {0, 1, 4}, // 79 |
| {0, 0, 6}, // 63 |
| {1, 0, 4}, // 47 |
| {0, 1, 3}, // 39 |
| {0, 0, 5}, // 31 |
| {1, 0, 3}, // 23 |
| {0, 1, 2}, // 19 |
| {0, 0, 4}, // 15 |
| {1, 0, 2}, // 11 |
| {0, 1, 1}, // 9 |
| {0, 0, 3}, // 7 |
| {1, 0, 1}, // 5 |
| {0, 0, 2}, // 3 |
| {0, 0, 1}, // 1 |
| }; |
| |
| // Lookup table to decode a pack of 5 trits (encoded with 8 bits) |
| // index: the 8 bits that make the pack of 5 trits |
| // output: the values for the 5 trits, packed together using 2 bits each |
| // Refer to "C.2.12 Integer Sequence Encoding" |
| const uint kTritEncodings[256] = { |
| 0, 1, 2, 32, 4, 5, 6, 33, 8, 9, 10, 34, 40, 41, 42, 34, 16, 17, 18, |
| 36, 20, 21, 22, 37, 24, 25, 26, 38, 640, 641, 642, 672, 64, 65, 66, 96, 68, 69, |
| 70, 97, 72, 73, 74, 98, 104, 105, 106, 98, 80, 81, 82, 100, 84, 85, 86, 101, 88, |
| 89, 90, 102, 644, 645, 646, 673, 128, 129, 130, 160, 132, 133, 134, 161, 136, 137, 138, 162, |
| 168, 169, 170, 162, 144, 145, 146, 164, 148, 149, 150, 165, 152, 153, 154, 166, 648, 649, 650, |
| 674, 512, 513, 514, 544, 516, 517, 518, 545, 520, 521, 522, 546, 552, 553, 554, 546, 528, 529, |
| 530, 548, 532, 533, 534, 549, 536, 537, 538, 550, 680, 681, 682, 674, 256, 257, 258, 288, 260, |
| 261, 262, 289, 264, 265, 266, 290, 296, 297, 298, 290, 272, 273, 274, 292, 276, 277, 278, 293, |
| 280, 281, 282, 294, 656, 657, 658, 676, 320, 321, 322, 352, 324, 325, 326, 353, 328, 329, 330, |
| 354, 360, 361, 362, 354, 336, 337, 338, 356, 340, 341, 342, 357, 344, 345, 346, 358, 660, 661, |
| 662, 677, 384, 385, 386, 416, 388, 389, 390, 417, 392, 393, 394, 418, 424, 425, 426, 418, 400, |
| 401, 402, 420, 404, 405, 406, 421, 408, 409, 410, 422, 664, 665, 666, 678, 576, 577, 578, 608, |
| 580, 581, 582, 609, 584, 585, 586, 610, 616, 617, 618, 610, 592, 593, 594, 612, 596, 597, 598, |
| 613, 600, 601, 602, 614, 680, 681, 682, 678}; |
| |
| // Lookup table to decode a pack of 3 quints (encoded with 7 bits) |
| // index: the 7 bits that make the pack of 3 quints |
| // output: the values for the 3 quints, packed together using 3 bits each |
| // Refer to "C.2.12 Integer Sequence Encoding" |
| const uint kQuintEncodings[128] = { |
| 0, 1, 2, 3, 4, 32, 36, 292, 8, 9, 10, 11, 12, 33, 100, 292, 16, 17, 18, |
| 19, 20, 34, 164, 292, 24, 25, 26, 27, 28, 35, 228, 292, 64, 65, 66, 67, 68, 96, |
| 260, 288, 72, 73, 74, 75, 76, 97, 268, 289, 80, 81, 82, 83, 84, 98, 276, 290, 88, |
| 89, 90, 91, 92, 99, 284, 291, 128, 129, 130, 131, 132, 160, 258, 259, 136, 137, 138, 139, |
| 140, 161, 266, 267, 144, 145, 146, 147, 148, 162, 274, 275, 152, 153, 154, 155, 156, 163, 282, |
| 283, 192, 193, 194, 195, 196, 224, 256, 257, 200, 201, 202, 203, 204, 225, 264, 265, 208, 209, |
| 210, 211, 212, 226, 272, 273, 216, 217, 218, 219, 220, 227, 280, 281}; |
| |
| // Array to unquantize weights encoded with the trit + bits encoding. |
| // Use `3 * (2^bits - 1) + trit` to find the index in this table. |
| const uint kUnquantTritWeightMap[45] = { |
| 0, 32, 64, 0, 64, 12, 52, 25, 39, 0, 64, 17, 47, 5, 59, 23, 41, 11, 53, 28, 36, 0, 64, |
| 8, 56, 16, 48, 24, 40, 2, 62, 11, 53, 19, 45, 27, 37, 5, 59, 13, 51, 22, 42, 30, 34, |
| }; |
| |
| // Array to unquantize weights encoded with the quint + bits encoding. |
| // Use `5 * (2^bits - 1) + quint` to find the index in this table. |
| const uint kUnquantQuintWeightMap[35] = { |
| 0, 16, 32, 48, 64, 0, 64, 7, 57, 14, 50, 21, 43, 28, 36, 0, 64, 16, |
| 48, 3, 61, 19, 45, 6, 58, 23, 41, 9, 55, 26, 38, 13, 51, 29, 35, |
| }; |
| |
| // Array to unquantize color endpoint data encoded with the trit + bits encoding. |
| // Use `3 * (2^bits - 1) + quint` to find the index in this table. |
| const uint kUnquantTritColorMap[381] = { |
| 0, 0, 0, 0, 255, 51, 204, 102, 153, 0, 255, 69, 186, 23, 232, 92, 163, 46, 209, |
| 116, 139, 0, 255, 33, 222, 66, 189, 99, 156, 11, 244, 44, 211, 77, 178, 110, 145, 22, |
| 233, 55, 200, 88, 167, 121, 134, 0, 255, 16, 239, 32, 223, 48, 207, 65, 190, 81, 174, |
| 97, 158, 113, 142, 5, 250, 21, 234, 38, 217, 54, 201, 70, 185, 86, 169, 103, 152, 119, |
| 136, 11, 244, 27, 228, 43, 212, 59, 196, 76, 179, 92, 163, 108, 147, 124, 131, 0, 255, |
| 8, 247, 16, 239, 24, 231, 32, 223, 40, 215, 48, 207, 56, 199, 64, 191, 72, 183, 80, |
| 175, 88, 167, 96, 159, 104, 151, 112, 143, 120, 135, 2, 253, 10, 245, 18, 237, 26, 229, |
| 35, 220, 43, 212, 51, 204, 59, 196, 67, 188, 75, 180, 83, 172, 91, 164, 99, 156, 107, |
| 148, 115, 140, 123, 132, 5, 250, 13, 242, 21, 234, 29, 226, 37, 218, 45, 210, 53, 202, |
| 61, 194, 70, 185, 78, 177, 86, 169, 94, 161, 102, 153, 110, 145, 118, 137, 126, 129, 0, |
| 255, 4, 251, 8, 247, 12, 243, 16, 239, 20, 235, 24, 231, 28, 227, 32, 223, 36, 219, |
| 40, 215, 44, 211, 48, 207, 52, 203, 56, 199, 60, 195, 64, 191, 68, 187, 72, 183, 76, |
| 179, 80, 175, 84, 171, 88, 167, 92, 163, 96, 159, 100, 155, 104, 151, 108, 147, 112, 143, |
| 116, 139, 120, 135, 124, 131, 1, 254, 5, 250, 9, 246, 13, 242, 17, 238, 21, 234, 25, |
| 230, 29, 226, 33, 222, 37, 218, 41, 214, 45, 210, 49, 206, 53, 202, 57, 198, 61, 194, |
| 65, 190, 69, 186, 73, 182, 77, 178, 81, 174, 85, 170, 89, 166, 93, 162, 97, 158, 101, |
| 154, 105, 150, 109, 146, 113, 142, 117, 138, 121, 134, 125, 130, 2, 253, 6, 249, 10, 245, |
| 14, 241, 18, 237, 22, 233, 26, 229, 30, 225, 34, 221, 38, 217, 42, 213, 46, 209, 50, |
| 205, 54, 201, 58, 197, 62, 193, 66, 189, 70, 185, 74, 181, 78, 177, 82, 173, 86, 169, |
| 90, 165, 94, 161, 98, 157, 102, 153, 106, 149, 110, 145, 114, 141, 118, 137, 122, 133, 126, |
| 129, |
| }; |
| |
| // Array to unquantize color endpoint data encoded with the quint + bits encoding. |
| // Use `5 * (2^bits - 1) + quint` to find the index in this table. |
| const uint kUnquantQuintColorMap[315] = { |
| 0, 0, 0, 0, 0, 0, 255, 28, 227, 56, 199, 84, 171, 113, 142, 0, 255, 67, 188, |
| 13, 242, 80, 175, 27, 228, 94, 161, 40, 215, 107, 148, 54, 201, 121, 134, 0, 255, 32, |
| 223, 65, 190, 97, 158, 6, 249, 39, 216, 71, 184, 104, 151, 13, 242, 45, 210, 78, 177, |
| 110, 145, 19, 236, 52, 203, 84, 171, 117, 138, 26, 229, 58, 197, 91, 164, 123, 132, 0, |
| 255, 16, 239, 32, 223, 48, 207, 64, 191, 80, 175, 96, 159, 112, 143, 3, 252, 19, 236, |
| 35, 220, 51, 204, 67, 188, 83, 172, 100, 155, 116, 139, 6, 249, 22, 233, 38, 217, 54, |
| 201, 71, 184, 87, 168, 103, 152, 119, 136, 9, 246, 25, 230, 42, 213, 58, 197, 74, 181, |
| 90, 165, 106, 149, 122, 133, 13, 242, 29, 226, 45, 210, 61, 194, 77, 178, 93, 162, 109, |
| 146, 125, 130, 0, 255, 8, 247, 16, 239, 24, 231, 32, 223, 40, 215, 48, 207, 56, 199, |
| 64, 191, 72, 183, 80, 175, 88, 167, 96, 159, 104, 151, 112, 143, 120, 135, 1, 254, 9, |
| 246, 17, 238, 25, 230, 33, 222, 41, 214, 49, 206, 57, 198, 65, 190, 73, 182, 81, 174, |
| 89, 166, 97, 158, 105, 150, 113, 142, 121, 134, 3, 252, 11, 244, 19, 236, 27, 228, 35, |
| 220, 43, 212, 51, 204, 59, 196, 67, 188, 75, 180, 83, 172, 91, 164, 99, 156, 107, 148, |
| 115, 140, 123, 132, 4, 251, 12, 243, 20, 235, 28, 227, 36, 219, 44, 211, 52, 203, 60, |
| 195, 68, 187, 76, 179, 84, 171, 92, 163, 100, 155, 108, 147, 116, 139, 124, 131, 6, 249, |
| 14, 241, 22, 233, 30, 225, 38, 217, 46, 209, 54, 201, 62, 193, 70, 185, 78, 177, 86, |
| 169, 94, 161, 102, 153, 110, 145, 118, 137, 126, 129, |
| }; |
