diff options
Diffstat (limited to 'thirdparty/astcenc/astcenc_block_sizes.cpp')
| -rw-r--r-- | thirdparty/astcenc/astcenc_block_sizes.cpp | 1184 |
1 files changed, 1184 insertions, 0 deletions
diff --git a/thirdparty/astcenc/astcenc_block_sizes.cpp b/thirdparty/astcenc/astcenc_block_sizes.cpp new file mode 100644 index 0000000000..1c22d06a5c --- /dev/null +++ b/thirdparty/astcenc/astcenc_block_sizes.cpp @@ -0,0 +1,1184 @@ +// SPDX-License-Identifier: Apache-2.0 +// ---------------------------------------------------------------------------- +// Copyright 2011-2023 Arm Limited +// +// Licensed under the Apache License, Version 2.0 (the "License"); you may not +// use this file except in compliance with the License. You may obtain a copy +// of the License at: +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT +// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the +// License for the specific language governing permissions and limitations +// under the License. +// ---------------------------------------------------------------------------- + +/** + * @brief Functions to generate block size descriptor and decimation tables. + */ + +#include "astcenc_internal.h" + +/** + * @brief Decode the properties of an encoded 2D block mode. + * + * @param block_mode The encoded block mode. + * @param[out] x_weights The number of weights in the X dimension. + * @param[out] y_weights The number of weights in the Y dimension. + * @param[out] is_dual_plane True if this block mode has two weight planes. + * @param[out] quant_mode The quantization level for the weights. + * @param[out] weight_bits The storage bit count for the weights. + * + * @return Returns true if a valid mode, false otherwise. + */ +static bool decode_block_mode_2d( + unsigned int block_mode, + unsigned int& x_weights, + unsigned int& y_weights, + bool& is_dual_plane, + unsigned int& quant_mode, + unsigned int& weight_bits +) { + unsigned int base_quant_mode = (block_mode >> 4) & 1; + unsigned int H = (block_mode >> 9) & 1; + unsigned int D = (block_mode >> 10) & 1; + unsigned int A = (block_mode >> 5) & 0x3; + + x_weights = 0; + y_weights = 0; + + if ((block_mode & 3) != 0) + { + base_quant_mode |= (block_mode & 3) << 1; + unsigned int B = (block_mode >> 7) & 3; + switch ((block_mode >> 2) & 3) + { + case 0: + x_weights = B + 4; + y_weights = A + 2; + break; + case 1: + x_weights = B + 8; + y_weights = A + 2; + break; + case 2: + x_weights = A + 2; + y_weights = B + 8; + break; + case 3: + B &= 1; + if (block_mode & 0x100) + { + x_weights = B + 2; + y_weights = A + 2; + } + else + { + x_weights = A + 2; + y_weights = B + 6; + } + break; + } + } + else + { + base_quant_mode |= ((block_mode >> 2) & 3) << 1; + if (((block_mode >> 2) & 3) == 0) + { + return false; + } + + unsigned int B = (block_mode >> 9) & 3; + switch ((block_mode >> 7) & 3) + { + case 0: + x_weights = 12; + y_weights = A + 2; + break; + case 1: + x_weights = A + 2; + y_weights = 12; + break; + case 2: + x_weights = A + 6; + y_weights = B + 6; + D = 0; + H = 0; + break; + case 3: + switch ((block_mode >> 5) & 3) + { + case 0: + x_weights = 6; + y_weights = 10; + break; + case 1: + x_weights = 10; + y_weights = 6; + break; + case 2: + case 3: + return false; + } + break; + } + } + + unsigned int weight_count = x_weights * y_weights * (D + 1); + quant_mode = (base_quant_mode - 2) + 6 * H; + is_dual_plane = D != 0; + + weight_bits = get_ise_sequence_bitcount(weight_count, static_cast<quant_method>(quant_mode)); + return (weight_count <= BLOCK_MAX_WEIGHTS && + weight_bits >= BLOCK_MIN_WEIGHT_BITS && + weight_bits <= BLOCK_MAX_WEIGHT_BITS); +} + +/** + * @brief Decode the properties of an encoded 3D block mode. + * + * @param block_mode The encoded block mode. + * @param[out] x_weights The number of weights in the X dimension. + * @param[out] y_weights The number of weights in the Y dimension. + * @param[out] z_weights The number of weights in the Z dimension. + * @param[out] is_dual_plane True if this block mode has two weight planes. + * @param[out] quant_mode The quantization level for the weights. + * @param[out] weight_bits The storage bit count for the weights. + * + * @return Returns true if a valid mode, false otherwise. + */ +static bool decode_block_mode_3d( + unsigned int block_mode, + unsigned int& x_weights, + unsigned int& y_weights, + unsigned int& z_weights, + bool& is_dual_plane, + unsigned int& quant_mode, + unsigned int& weight_bits +) { + unsigned int base_quant_mode = (block_mode >> 4) & 1; + unsigned int H = (block_mode >> 9) & 1; + unsigned int D = (block_mode >> 10) & 1; + unsigned int A = (block_mode >> 5) & 0x3; + + x_weights = 0; + y_weights = 0; + z_weights = 0; + + if ((block_mode & 3) != 0) + { + base_quant_mode |= (block_mode & 3) << 1; + unsigned int B = (block_mode >> 7) & 3; + unsigned int C = (block_mode >> 2) & 0x3; + x_weights = A + 2; + y_weights = B + 2; + z_weights = C + 2; + } + else + { + base_quant_mode |= ((block_mode >> 2) & 3) << 1; + if (((block_mode >> 2) & 3) == 0) + { + return false; + } + + int B = (block_mode >> 9) & 3; + if (((block_mode >> 7) & 3) != 3) + { + D = 0; + H = 0; + } + switch ((block_mode >> 7) & 3) + { + case 0: + x_weights = 6; + y_weights = B + 2; + z_weights = A + 2; + break; + case 1: + x_weights = A + 2; + y_weights = 6; + z_weights = B + 2; + break; + case 2: + x_weights = A + 2; + y_weights = B + 2; + z_weights = 6; + break; + case 3: + x_weights = 2; + y_weights = 2; + z_weights = 2; + switch ((block_mode >> 5) & 3) + { + case 0: + x_weights = 6; + break; + case 1: + y_weights = 6; + break; + case 2: + z_weights = 6; + break; + case 3: + return false; + } + break; + } + } + + unsigned int weight_count = x_weights * y_weights * z_weights * (D + 1); + quant_mode = (base_quant_mode - 2) + 6 * H; + is_dual_plane = D != 0; + + weight_bits = get_ise_sequence_bitcount(weight_count, static_cast<quant_method>(quant_mode)); + return (weight_count <= BLOCK_MAX_WEIGHTS && + weight_bits >= BLOCK_MIN_WEIGHT_BITS && + weight_bits <= BLOCK_MAX_WEIGHT_BITS); +} + +/** + * @brief Create a 2D decimation entry for a block-size and weight-decimation pair. + * + * @param x_texels The number of texels in the X dimension. + * @param y_texels The number of texels in the Y dimension. + * @param x_weights The number of weights in the X dimension. + * @param y_weights The number of weights in the Y dimension. + * @param[out] di The decimation info structure to populate. + * @param[out] wb The decimation table init scratch working buffers. + */ +static void init_decimation_info_2d( + unsigned int x_texels, + unsigned int y_texels, + unsigned int x_weights, + unsigned int y_weights, + decimation_info& di, + dt_init_working_buffers& wb +) { + unsigned int texels_per_block = x_texels * y_texels; + unsigned int weights_per_block = x_weights * y_weights; + + uint8_t max_texel_count_of_weight = 0; + + promise(weights_per_block > 0); + promise(texels_per_block > 0); + promise(x_texels > 0); + promise(y_texels > 0); + + for (unsigned int i = 0; i < weights_per_block; i++) + { + wb.texel_count_of_weight[i] = 0; + } + + for (unsigned int i = 0; i < texels_per_block; i++) + { + wb.weight_count_of_texel[i] = 0; + } + + for (unsigned int y = 0; y < y_texels; y++) + { + for (unsigned int x = 0; x < x_texels; x++) + { + unsigned int texel = y * x_texels + x; + + unsigned int x_weight = (((1024 + x_texels / 2) / (x_texels - 1)) * x * (x_weights - 1) + 32) >> 6; + unsigned int y_weight = (((1024 + y_texels / 2) / (y_texels - 1)) * y * (y_weights - 1) + 32) >> 6; + + unsigned int x_weight_frac = x_weight & 0xF; + unsigned int y_weight_frac = y_weight & 0xF; + unsigned int x_weight_int = x_weight >> 4; + unsigned int y_weight_int = y_weight >> 4; + + unsigned int qweight[4]; + qweight[0] = x_weight_int + y_weight_int * x_weights; + qweight[1] = qweight[0] + 1; + qweight[2] = qweight[0] + x_weights; + qweight[3] = qweight[2] + 1; + + // Truncated-precision bilinear interpolation + unsigned int prod = x_weight_frac * y_weight_frac; + + unsigned int weight[4]; + weight[3] = (prod + 8) >> 4; + weight[1] = x_weight_frac - weight[3]; + weight[2] = y_weight_frac - weight[3]; + weight[0] = 16 - x_weight_frac - y_weight_frac + weight[3]; + + for (unsigned int i = 0; i < 4; i++) + { + if (weight[i] != 0) + { + wb.grid_weights_of_texel[texel][wb.weight_count_of_texel[texel]] = static_cast<uint8_t>(qweight[i]); + wb.weights_of_texel[texel][wb.weight_count_of_texel[texel]] = static_cast<uint8_t>(weight[i]); + wb.weight_count_of_texel[texel]++; + wb.texels_of_weight[qweight[i]][wb.texel_count_of_weight[qweight[i]]] = static_cast<uint8_t>(texel); + wb.texel_weights_of_weight[qweight[i]][wb.texel_count_of_weight[qweight[i]]] = static_cast<uint8_t>(weight[i]); + wb.texel_count_of_weight[qweight[i]]++; + max_texel_count_of_weight = astc::max(max_texel_count_of_weight, wb.texel_count_of_weight[qweight[i]]); + } + } + } + } + + uint8_t max_texel_weight_count = 0; + for (unsigned int i = 0; i < texels_per_block; i++) + { + di.texel_weight_count[i] = wb.weight_count_of_texel[i]; + max_texel_weight_count = astc::max(max_texel_weight_count, di.texel_weight_count[i]); + + for (unsigned int j = 0; j < wb.weight_count_of_texel[i]; j++) + { + di.texel_weight_contribs_int_tr[j][i] = wb.weights_of_texel[i][j]; + di.texel_weight_contribs_float_tr[j][i] = static_cast<float>(wb.weights_of_texel[i][j]) * (1.0f / WEIGHTS_TEXEL_SUM); + di.texel_weights_tr[j][i] = wb.grid_weights_of_texel[i][j]; + } + + // Init all 4 entries so we can rely on zeros for vectorization + for (unsigned int j = wb.weight_count_of_texel[i]; j < 4; j++) + { + di.texel_weight_contribs_int_tr[j][i] = 0; + di.texel_weight_contribs_float_tr[j][i] = 0.0f; + di.texel_weights_tr[j][i] = 0; + } + } + + di.max_texel_weight_count = max_texel_weight_count; + + for (unsigned int i = 0; i < weights_per_block; i++) + { + unsigned int texel_count_wt = wb.texel_count_of_weight[i]; + di.weight_texel_count[i] = static_cast<uint8_t>(texel_count_wt); + + for (unsigned int j = 0; j < texel_count_wt; j++) + { + uint8_t texel = wb.texels_of_weight[i][j]; + + // Create transposed versions of these for better vectorization + di.weight_texels_tr[j][i] = texel; + di.weights_texel_contribs_tr[j][i] = static_cast<float>(wb.texel_weights_of_weight[i][j]); + + // Store the per-texel contribution of this weight for each texel it contributes to + di.texel_contrib_for_weight[j][i] = 0.0f; + for (unsigned int k = 0; k < 4; k++) + { + uint8_t dttw = di.texel_weights_tr[k][texel]; + float dttwf = di.texel_weight_contribs_float_tr[k][texel]; + if (dttw == i && dttwf != 0.0f) + { + di.texel_contrib_for_weight[j][i] = di.texel_weight_contribs_float_tr[k][texel]; + break; + } + } + } + + // Initialize array tail so we can over-fetch with SIMD later to avoid loop tails + // Match last texel in active lane in SIMD group, for better gathers + uint8_t last_texel = di.weight_texels_tr[texel_count_wt - 1][i]; + for (unsigned int j = texel_count_wt; j < max_texel_count_of_weight; j++) + { + di.weight_texels_tr[j][i] = last_texel; + di.weights_texel_contribs_tr[j][i] = 0.0f; + } + } + + // Initialize array tail so we can over-fetch with SIMD later to avoid loop tails + unsigned int texels_per_block_simd = round_up_to_simd_multiple_vla(texels_per_block); + for (unsigned int i = texels_per_block; i < texels_per_block_simd; i++) + { + di.texel_weight_count[i] = 0; + + for (unsigned int j = 0; j < 4; j++) + { + di.texel_weight_contribs_float_tr[j][i] = 0; + di.texel_weights_tr[j][i] = 0; + di.texel_weight_contribs_int_tr[j][i] = 0; + } + } + + // Initialize array tail so we can over-fetch with SIMD later to avoid loop tails + // Match last texel in active lane in SIMD group, for better gathers + unsigned int last_texel_count_wt = wb.texel_count_of_weight[weights_per_block - 1]; + uint8_t last_texel = di.weight_texels_tr[last_texel_count_wt - 1][weights_per_block - 1]; + + unsigned int weights_per_block_simd = round_up_to_simd_multiple_vla(weights_per_block); + for (unsigned int i = weights_per_block; i < weights_per_block_simd; i++) + { + di.weight_texel_count[i] = 0; + + for (unsigned int j = 0; j < max_texel_count_of_weight; j++) + { + di.weight_texels_tr[j][i] = last_texel; + di.weights_texel_contribs_tr[j][i] = 0.0f; + } + } + + di.texel_count = static_cast<uint8_t>(texels_per_block); + di.weight_count = static_cast<uint8_t>(weights_per_block); + di.weight_x = static_cast<uint8_t>(x_weights); + di.weight_y = static_cast<uint8_t>(y_weights); + di.weight_z = 1; +} + +/** + * @brief Create a 3D decimation entry for a block-size and weight-decimation pair. + * + * @param x_texels The number of texels in the X dimension. + * @param y_texels The number of texels in the Y dimension. + * @param z_texels The number of texels in the Z dimension. + * @param x_weights The number of weights in the X dimension. + * @param y_weights The number of weights in the Y dimension. + * @param z_weights The number of weights in the Z dimension. + * @param[out] di The decimation info structure to populate. + @param[out] wb The decimation table init scratch working buffers. + */ +static void init_decimation_info_3d( + unsigned int x_texels, + unsigned int y_texels, + unsigned int z_texels, + unsigned int x_weights, + unsigned int y_weights, + unsigned int z_weights, + decimation_info& di, + dt_init_working_buffers& wb +) { + unsigned int texels_per_block = x_texels * y_texels * z_texels; + unsigned int weights_per_block = x_weights * y_weights * z_weights; + + uint8_t max_texel_count_of_weight = 0; + + promise(weights_per_block > 0); + promise(texels_per_block > 0); + + for (unsigned int i = 0; i < weights_per_block; i++) + { + wb.texel_count_of_weight[i] = 0; + } + + for (unsigned int i = 0; i < texels_per_block; i++) + { + wb.weight_count_of_texel[i] = 0; + } + + for (unsigned int z = 0; z < z_texels; z++) + { + for (unsigned int y = 0; y < y_texels; y++) + { + for (unsigned int x = 0; x < x_texels; x++) + { + int texel = (z * y_texels + y) * x_texels + x; + + int x_weight = (((1024 + x_texels / 2) / (x_texels - 1)) * x * (x_weights - 1) + 32) >> 6; + int y_weight = (((1024 + y_texels / 2) / (y_texels - 1)) * y * (y_weights - 1) + 32) >> 6; + int z_weight = (((1024 + z_texels / 2) / (z_texels - 1)) * z * (z_weights - 1) + 32) >> 6; + + int x_weight_frac = x_weight & 0xF; + int y_weight_frac = y_weight & 0xF; + int z_weight_frac = z_weight & 0xF; + int x_weight_int = x_weight >> 4; + int y_weight_int = y_weight >> 4; + int z_weight_int = z_weight >> 4; + int qweight[4]; + int weight[4]; + qweight[0] = (z_weight_int * y_weights + y_weight_int) * x_weights + x_weight_int; + qweight[3] = ((z_weight_int + 1) * y_weights + (y_weight_int + 1)) * x_weights + (x_weight_int + 1); + + // simplex interpolation + int fs = x_weight_frac; + int ft = y_weight_frac; + int fp = z_weight_frac; + + int cas = ((fs > ft) << 2) + ((ft > fp) << 1) + ((fs > fp)); + int N = x_weights; + int NM = x_weights * y_weights; + + int s1, s2, w0, w1, w2, w3; + switch (cas) + { + case 7: + s1 = 1; + s2 = N; + w0 = 16 - fs; + w1 = fs - ft; + w2 = ft - fp; + w3 = fp; + break; + case 3: + s1 = N; + s2 = 1; + w0 = 16 - ft; + w1 = ft - fs; + w2 = fs - fp; + w3 = fp; + break; + case 5: + s1 = 1; + s2 = NM; + w0 = 16 - fs; + w1 = fs - fp; + w2 = fp - ft; + w3 = ft; + break; + case 4: + s1 = NM; + s2 = 1; + w0 = 16 - fp; + w1 = fp - fs; + w2 = fs - ft; + w3 = ft; + break; + case 2: + s1 = N; + s2 = NM; + w0 = 16 - ft; + w1 = ft - fp; + w2 = fp - fs; + w3 = fs; + break; + case 0: + s1 = NM; + s2 = N; + w0 = 16 - fp; + w1 = fp - ft; + w2 = ft - fs; + w3 = fs; + break; + default: + s1 = NM; + s2 = N; + w0 = 16 - fp; + w1 = fp - ft; + w2 = ft - fs; + w3 = fs; + break; + } + + qweight[1] = qweight[0] + s1; + qweight[2] = qweight[1] + s2; + weight[0] = w0; + weight[1] = w1; + weight[2] = w2; + weight[3] = w3; + + for (unsigned int i = 0; i < 4; i++) + { + if (weight[i] != 0) + { + wb.grid_weights_of_texel[texel][wb.weight_count_of_texel[texel]] = static_cast<uint8_t>(qweight[i]); + wb.weights_of_texel[texel][wb.weight_count_of_texel[texel]] = static_cast<uint8_t>(weight[i]); + wb.weight_count_of_texel[texel]++; + wb.texels_of_weight[qweight[i]][wb.texel_count_of_weight[qweight[i]]] = static_cast<uint8_t>(texel); + wb.texel_weights_of_weight[qweight[i]][wb.texel_count_of_weight[qweight[i]]] = static_cast<uint8_t>(weight[i]); + wb.texel_count_of_weight[qweight[i]]++; + max_texel_count_of_weight = astc::max(max_texel_count_of_weight, wb.texel_count_of_weight[qweight[i]]); + } + } + } + } + } + + uint8_t max_texel_weight_count = 0; + for (unsigned int i = 0; i < texels_per_block; i++) + { + di.texel_weight_count[i] = wb.weight_count_of_texel[i]; + max_texel_weight_count = astc::max(max_texel_weight_count, di.texel_weight_count[i]); + + // Init all 4 entries so we can rely on zeros for vectorization + for (unsigned int j = 0; j < 4; j++) + { + di.texel_weight_contribs_int_tr[j][i] = 0; + di.texel_weight_contribs_float_tr[j][i] = 0.0f; + di.texel_weights_tr[j][i] = 0; + } + + for (unsigned int j = 0; j < wb.weight_count_of_texel[i]; j++) + { + di.texel_weight_contribs_int_tr[j][i] = wb.weights_of_texel[i][j]; + di.texel_weight_contribs_float_tr[j][i] = static_cast<float>(wb.weights_of_texel[i][j]) * (1.0f / WEIGHTS_TEXEL_SUM); + di.texel_weights_tr[j][i] = wb.grid_weights_of_texel[i][j]; + } + } + + di.max_texel_weight_count = max_texel_weight_count; + + for (unsigned int i = 0; i < weights_per_block; i++) + { + unsigned int texel_count_wt = wb.texel_count_of_weight[i]; + di.weight_texel_count[i] = static_cast<uint8_t>(texel_count_wt); + + for (unsigned int j = 0; j < texel_count_wt; j++) + { + unsigned int texel = wb.texels_of_weight[i][j]; + + // Create transposed versions of these for better vectorization + di.weight_texels_tr[j][i] = static_cast<uint8_t>(texel); + di.weights_texel_contribs_tr[j][i] = static_cast<float>(wb.texel_weights_of_weight[i][j]); + + // Store the per-texel contribution of this weight for each texel it contributes to + di.texel_contrib_for_weight[j][i] = 0.0f; + for (unsigned int k = 0; k < 4; k++) + { + uint8_t dttw = di.texel_weights_tr[k][texel]; + float dttwf = di.texel_weight_contribs_float_tr[k][texel]; + if (dttw == i && dttwf != 0.0f) + { + di.texel_contrib_for_weight[j][i] = di.texel_weight_contribs_float_tr[k][texel]; + break; + } + } + } + + // Initialize array tail so we can over-fetch with SIMD later to avoid loop tails + // Match last texel in active lane in SIMD group, for better gathers + uint8_t last_texel = di.weight_texels_tr[texel_count_wt - 1][i]; + for (unsigned int j = texel_count_wt; j < max_texel_count_of_weight; j++) + { + di.weight_texels_tr[j][i] = last_texel; + di.weights_texel_contribs_tr[j][i] = 0.0f; + } + } + + // Initialize array tail so we can over-fetch with SIMD later to avoid loop tails + unsigned int texels_per_block_simd = round_up_to_simd_multiple_vla(texels_per_block); + for (unsigned int i = texels_per_block; i < texels_per_block_simd; i++) + { + di.texel_weight_count[i] = 0; + + for (unsigned int j = 0; j < 4; j++) + { + di.texel_weight_contribs_float_tr[j][i] = 0; + di.texel_weights_tr[j][i] = 0; + di.texel_weight_contribs_int_tr[j][i] = 0; + } + } + + // Initialize array tail so we can over-fetch with SIMD later to avoid loop tails + // Match last texel in active lane in SIMD group, for better gathers + int last_texel_count_wt = wb.texel_count_of_weight[weights_per_block - 1]; + uint8_t last_texel = di.weight_texels_tr[last_texel_count_wt - 1][weights_per_block - 1]; + + unsigned int weights_per_block_simd = round_up_to_simd_multiple_vla(weights_per_block); + for (unsigned int i = weights_per_block; i < weights_per_block_simd; i++) + { + di.weight_texel_count[i] = 0; + + for (int j = 0; j < max_texel_count_of_weight; j++) + { + di.weight_texels_tr[j][i] = last_texel; + di.weights_texel_contribs_tr[j][i] = 0.0f; + } + } + + di.texel_count = static_cast<uint8_t>(texels_per_block); + di.weight_count = static_cast<uint8_t>(weights_per_block); + di.weight_x = static_cast<uint8_t>(x_weights); + di.weight_y = static_cast<uint8_t>(y_weights); + di.weight_z = static_cast<uint8_t>(z_weights); +} + +/** + * @brief Assign the texels to use for kmeans clustering. + * + * The max limit is @c BLOCK_MAX_KMEANS_TEXELS; above this a random selection is used. + * The @c bsd.texel_count is an input and must be populated beforehand. + * + * @param[in,out] bsd The block size descriptor to populate. + */ +static void assign_kmeans_texels( + block_size_descriptor& bsd +) { + // Use all texels for kmeans on a small block + if (bsd.texel_count <= BLOCK_MAX_KMEANS_TEXELS) + { + for (uint8_t i = 0; i < bsd.texel_count; i++) + { + bsd.kmeans_texels[i] = i; + } + + return; + } + + // Select a random subset of BLOCK_MAX_KMEANS_TEXELS for kmeans on a large block + uint64_t rng_state[2]; + astc::rand_init(rng_state); + + // Initialize array used for tracking used indices + bool seen[BLOCK_MAX_TEXELS]; + for (uint8_t i = 0; i < bsd.texel_count; i++) + { + seen[i] = false; + } + + // Assign 64 random indices, retrying if we see repeats + unsigned int arr_elements_set = 0; + while (arr_elements_set < BLOCK_MAX_KMEANS_TEXELS) + { + uint8_t texel = static_cast<uint8_t>(astc::rand(rng_state)); + texel = texel % bsd.texel_count; + if (!seen[texel]) + { + bsd.kmeans_texels[arr_elements_set++] = texel; + seen[texel] = true; + } + } +} + +/** + * @brief Allocate a single 2D decimation table entry. + * + * @param x_texels The number of texels in the X dimension. + * @param y_texels The number of texels in the Y dimension. + * @param x_weights The number of weights in the X dimension. + * @param y_weights The number of weights in the Y dimension. + * @param bsd The block size descriptor we are populating. + * @param wb The decimation table init scratch working buffers. + * @param index The packed array index to populate. + */ +static void construct_dt_entry_2d( + unsigned int x_texels, + unsigned int y_texels, + unsigned int x_weights, + unsigned int y_weights, + block_size_descriptor& bsd, + dt_init_working_buffers& wb, + unsigned int index +) { + unsigned int weight_count = x_weights * y_weights; + assert(weight_count <= BLOCK_MAX_WEIGHTS); + + bool try_2planes = (2 * weight_count) <= BLOCK_MAX_WEIGHTS; + + decimation_info& di = bsd.decimation_tables[index]; + init_decimation_info_2d(x_texels, y_texels, x_weights, y_weights, di, wb); + + int maxprec_1plane = -1; + int maxprec_2planes = -1; + for (int i = 0; i < 12; i++) + { + unsigned int bits_1plane = get_ise_sequence_bitcount(weight_count, static_cast<quant_method>(i)); + if (bits_1plane >= BLOCK_MIN_WEIGHT_BITS && bits_1plane <= BLOCK_MAX_WEIGHT_BITS) + { + maxprec_1plane = i; + } + + if (try_2planes) + { + unsigned int bits_2planes = get_ise_sequence_bitcount(2 * weight_count, static_cast<quant_method>(i)); + if (bits_2planes >= BLOCK_MIN_WEIGHT_BITS && bits_2planes <= BLOCK_MAX_WEIGHT_BITS) + { + maxprec_2planes = i; + } + } + } + + // At least one of the two should be valid ... + assert(maxprec_1plane >= 0 || maxprec_2planes >= 0); + bsd.decimation_modes[index].maxprec_1plane = static_cast<int8_t>(maxprec_1plane); + bsd.decimation_modes[index].maxprec_2planes = static_cast<int8_t>(maxprec_2planes); + bsd.decimation_modes[index].refprec_1_plane = 0; + bsd.decimation_modes[index].refprec_2_planes = 0; +} + +/** + * @brief Allocate block modes and decimation tables for a single 2D block size. + * + * @param x_texels The number of texels in the X dimension. + * @param y_texels The number of texels in the Y dimension. + * @param can_omit_modes Can we discard modes that astcenc won't use, even if legal? + * @param mode_cutoff Percentile cutoff in range [0,1]. Low values more likely to be used. + * @param[out] bsd The block size descriptor to populate. + */ +static void construct_block_size_descriptor_2d( + unsigned int x_texels, + unsigned int y_texels, + bool can_omit_modes, + float mode_cutoff, + block_size_descriptor& bsd +) { + // Store a remap table for storing packed decimation modes. + // Indexing uses [Y * 16 + X] and max size for each axis is 12. + static const unsigned int MAX_DMI = 12 * 16 + 12; + int decimation_mode_index[MAX_DMI]; + + dt_init_working_buffers* wb = new dt_init_working_buffers; + + bsd.xdim = static_cast<uint8_t>(x_texels); + bsd.ydim = static_cast<uint8_t>(y_texels); + bsd.zdim = 1; + bsd.texel_count = static_cast<uint8_t>(x_texels * y_texels); + + for (unsigned int i = 0; i < MAX_DMI; i++) + { + decimation_mode_index[i] = -1; + } + + // Gather all the decimation grids that can be used with the current block +#if !defined(ASTCENC_DECOMPRESS_ONLY) + const float *percentiles = get_2d_percentile_table(x_texels, y_texels); + float always_cutoff = 0.0f; +#else + // Unused in decompress-only builds + (void)can_omit_modes; + (void)mode_cutoff; +#endif + + // Construct the list of block formats referencing the decimation tables + unsigned int packed_bm_idx = 0; + unsigned int packed_dm_idx = 0; + + // Trackers + unsigned int bm_counts[4] { 0 }; + unsigned int dm_counts[4] { 0 }; + + // Clear the list to a known-bad value + for (unsigned int i = 0; i < WEIGHTS_MAX_BLOCK_MODES; i++) + { + bsd.block_mode_packed_index[i] = BLOCK_BAD_BLOCK_MODE; + } + + // Iterate four times to build a usefully ordered list: + // - Pass 0 - keep selected single plane "always" block modes + // - Pass 1 - keep selected single plane "non-always" block modes + // - Pass 2 - keep select dual plane block modes + // - Pass 3 - keep everything else that's legal + unsigned int limit = can_omit_modes ? 3 : 4; + for (unsigned int j = 0; j < limit; j ++) + { + for (unsigned int i = 0; i < WEIGHTS_MAX_BLOCK_MODES; i++) + { + // Skip modes we've already included in a previous pass + if (bsd.block_mode_packed_index[i] != BLOCK_BAD_BLOCK_MODE) + { + continue; + } + + // Decode parameters + unsigned int x_weights; + unsigned int y_weights; + bool is_dual_plane; + unsigned int quant_mode; + unsigned int weight_bits; + bool valid = decode_block_mode_2d(i, x_weights, y_weights, is_dual_plane, quant_mode, weight_bits); + + // Always skip invalid encodings for the current block size + if (!valid || (x_weights > x_texels) || (y_weights > y_texels)) + { + continue; + } + + // Selectively skip dual plane encodings + if (((j <= 1) && is_dual_plane) || (j == 2 && !is_dual_plane)) + { + continue; + } + + // Always skip encodings we can't physically encode based on + // generic encoding bit availability + if (is_dual_plane) + { + // This is the only check we need as only support 1 partition + if ((109 - weight_bits) <= 0) + { + continue; + } + } + else + { + // This is conservative - fewer bits may be available for > 1 partition + if ((111 - weight_bits) <= 0) + { + continue; + } + } + + // Selectively skip encodings based on percentile + bool percentile_hit = false; + #if !defined(ASTCENC_DECOMPRESS_ONLY) + if (j == 0) + { + percentile_hit = percentiles[i] <= always_cutoff; + } + else + { + percentile_hit = percentiles[i] <= mode_cutoff; + } + #endif + + if (j != 3 && !percentile_hit) + { + continue; + } + + // Allocate and initialize the decimation table entry if we've not used it yet + int decimation_mode = decimation_mode_index[y_weights * 16 + x_weights]; + if (decimation_mode < 0) + { + construct_dt_entry_2d(x_texels, y_texels, x_weights, y_weights, bsd, *wb, packed_dm_idx); + decimation_mode_index[y_weights * 16 + x_weights] = packed_dm_idx; + decimation_mode = packed_dm_idx; + + dm_counts[j]++; + packed_dm_idx++; + } + + auto& bm = bsd.block_modes[packed_bm_idx]; + + bm.decimation_mode = static_cast<uint8_t>(decimation_mode); + bm.quant_mode = static_cast<uint8_t>(quant_mode); + bm.is_dual_plane = static_cast<uint8_t>(is_dual_plane); + bm.weight_bits = static_cast<uint8_t>(weight_bits); + bm.mode_index = static_cast<uint16_t>(i); + + auto& dm = bsd.decimation_modes[decimation_mode]; + + if (is_dual_plane) + { + dm.set_ref_2_plane(bm.get_weight_quant_mode()); + } + else + { + dm.set_ref_1_plane(bm.get_weight_quant_mode()); + } + + bsd.block_mode_packed_index[i] = static_cast<uint16_t>(packed_bm_idx); + + packed_bm_idx++; + bm_counts[j]++; + } + } + + bsd.block_mode_count_1plane_always = bm_counts[0]; + bsd.block_mode_count_1plane_selected = bm_counts[0] + bm_counts[1]; + bsd.block_mode_count_1plane_2plane_selected = bm_counts[0] + bm_counts[1] + bm_counts[2]; + bsd.block_mode_count_all = bm_counts[0] + bm_counts[1] + bm_counts[2] + bm_counts[3]; + + bsd.decimation_mode_count_always = dm_counts[0]; + bsd.decimation_mode_count_selected = dm_counts[0] + dm_counts[1] + dm_counts[2]; + bsd.decimation_mode_count_all = dm_counts[0] + dm_counts[1] + dm_counts[2] + dm_counts[3]; + +#if !defined(ASTCENC_DECOMPRESS_ONLY) + assert(bsd.block_mode_count_1plane_always > 0); + assert(bsd.decimation_mode_count_always > 0); + + delete[] percentiles; +#endif + + // Ensure the end of the array contains valid data (should never get read) + for (unsigned int i = bsd.decimation_mode_count_all; i < WEIGHTS_MAX_DECIMATION_MODES; i++) + { + bsd.decimation_modes[i].maxprec_1plane = -1; + bsd.decimation_modes[i].maxprec_2planes = -1; + bsd.decimation_modes[i].refprec_1_plane = 0; + bsd.decimation_modes[i].refprec_2_planes = 0; + } + + // Determine the texels to use for kmeans clustering. + assign_kmeans_texels(bsd); + + delete wb; +} + +/** + * @brief Allocate block modes and decimation tables for a single 3D block size. + * + * TODO: This function doesn't include all of the heuristics that we use for 2D block sizes such as + * the percentile mode cutoffs. If 3D becomes more widely used we should look at this. + * + * @param x_texels The number of texels in the X dimension. + * @param y_texels The number of texels in the Y dimension. + * @param z_texels The number of texels in the Z dimension. + * @param[out] bsd The block size descriptor to populate. + */ +static void construct_block_size_descriptor_3d( + unsigned int x_texels, + unsigned int y_texels, + unsigned int z_texels, + block_size_descriptor& bsd +) { + // Store a remap table for storing packed decimation modes. + // Indexing uses [Z * 64 + Y * 8 + X] and max size for each axis is 6. + static constexpr unsigned int MAX_DMI = 6 * 64 + 6 * 8 + 6; + int decimation_mode_index[MAX_DMI]; + unsigned int decimation_mode_count = 0; + + dt_init_working_buffers* wb = new dt_init_working_buffers; + + bsd.xdim = static_cast<uint8_t>(x_texels); + bsd.ydim = static_cast<uint8_t>(y_texels); + bsd.zdim = static_cast<uint8_t>(z_texels); + bsd.texel_count = static_cast<uint8_t>(x_texels * y_texels * z_texels); + + for (unsigned int i = 0; i < MAX_DMI; i++) + { + decimation_mode_index[i] = -1; + } + + // gather all the infill-modes that can be used with the current block size + for (unsigned int x_weights = 2; x_weights <= x_texels; x_weights++) + { + for (unsigned int y_weights = 2; y_weights <= y_texels; y_weights++) + { + for (unsigned int z_weights = 2; z_weights <= z_texels; z_weights++) + { + unsigned int weight_count = x_weights * y_weights * z_weights; + if (weight_count > BLOCK_MAX_WEIGHTS) + { + continue; + } + + decimation_info& di = bsd.decimation_tables[decimation_mode_count]; + decimation_mode_index[z_weights * 64 + y_weights * 8 + x_weights] = decimation_mode_count; + init_decimation_info_3d(x_texels, y_texels, z_texels, x_weights, y_weights, z_weights, di, *wb); + + int maxprec_1plane = -1; + int maxprec_2planes = -1; + for (unsigned int i = 0; i < 12; i++) + { + unsigned int bits_1plane = get_ise_sequence_bitcount(weight_count, static_cast<quant_method>(i)); + if (bits_1plane >= BLOCK_MIN_WEIGHT_BITS && bits_1plane <= BLOCK_MAX_WEIGHT_BITS) + { + maxprec_1plane = i; + } + + unsigned int bits_2planes = get_ise_sequence_bitcount(2 * weight_count, static_cast<quant_method>(i)); + if (bits_2planes >= BLOCK_MIN_WEIGHT_BITS && bits_2planes <= BLOCK_MAX_WEIGHT_BITS) + { + maxprec_2planes = i; + } + } + + if ((2 * weight_count) > BLOCK_MAX_WEIGHTS) + { + maxprec_2planes = -1; + } + + bsd.decimation_modes[decimation_mode_count].maxprec_1plane = static_cast<int8_t>(maxprec_1plane); + bsd.decimation_modes[decimation_mode_count].maxprec_2planes = static_cast<int8_t>(maxprec_2planes); + bsd.decimation_modes[decimation_mode_count].refprec_1_plane = maxprec_1plane == -1 ? 0 : 0xFFFF; + bsd.decimation_modes[decimation_mode_count].refprec_2_planes = maxprec_2planes == -1 ? 0 : 0xFFFF; + decimation_mode_count++; + } + } + } + + // Ensure the end of the array contains valid data (should never get read) + for (unsigned int i = decimation_mode_count; i < WEIGHTS_MAX_DECIMATION_MODES; i++) + { + bsd.decimation_modes[i].maxprec_1plane = -1; + bsd.decimation_modes[i].maxprec_2planes = -1; + bsd.decimation_modes[i].refprec_1_plane = 0; + bsd.decimation_modes[i].refprec_2_planes = 0; + } + + bsd.decimation_mode_count_always = 0; // Skipped for 3D modes + bsd.decimation_mode_count_selected = decimation_mode_count; + bsd.decimation_mode_count_all = decimation_mode_count; + + // Construct the list of block formats referencing the decimation tables + + // Clear the list to a known-bad value + for (unsigned int i = 0; i < WEIGHTS_MAX_BLOCK_MODES; i++) + { + bsd.block_mode_packed_index[i] = BLOCK_BAD_BLOCK_MODE; + } + + unsigned int packed_idx = 0; + unsigned int bm_counts[2] { 0 }; + + // Iterate two times to build a usefully ordered list: + // - Pass 0 - keep valid single plane block modes + // - Pass 1 - keep valid dual plane block modes + for (unsigned int j = 0; j < 2; j++) + { + for (unsigned int i = 0; i < WEIGHTS_MAX_BLOCK_MODES; i++) + { + // Skip modes we've already included in a previous pass + if (bsd.block_mode_packed_index[i] != BLOCK_BAD_BLOCK_MODE) + { + continue; + } + + unsigned int x_weights; + unsigned int y_weights; + unsigned int z_weights; + bool is_dual_plane; + unsigned int quant_mode; + unsigned int weight_bits; + + bool valid = decode_block_mode_3d(i, x_weights, y_weights, z_weights, is_dual_plane, quant_mode, weight_bits); + // Skip invalid encodings + if (!valid || x_weights > x_texels || y_weights > y_texels || z_weights > z_texels) + { + continue; + } + + // Skip encodings in the wrong iteration + if ((j == 0 && is_dual_plane) || (j == 1 && !is_dual_plane)) + { + continue; + } + + // Always skip encodings we can't physically encode based on bit availability + if (is_dual_plane) + { + // This is the only check we need as only support 1 partition + if ((109 - weight_bits) <= 0) + { + continue; + } + } + else + { + // This is conservative - fewer bits may be available for > 1 partition + if ((111 - weight_bits) <= 0) + { + continue; + } + } + + int decimation_mode = decimation_mode_index[z_weights * 64 + y_weights * 8 + x_weights]; + bsd.block_modes[packed_idx].decimation_mode = static_cast<uint8_t>(decimation_mode); + bsd.block_modes[packed_idx].quant_mode = static_cast<uint8_t>(quant_mode); + bsd.block_modes[packed_idx].weight_bits = static_cast<uint8_t>(weight_bits); + bsd.block_modes[packed_idx].is_dual_plane = static_cast<uint8_t>(is_dual_plane); + bsd.block_modes[packed_idx].mode_index = static_cast<uint16_t>(i); + + bsd.block_mode_packed_index[i] = static_cast<uint16_t>(packed_idx); + bm_counts[j]++; + packed_idx++; + } + } + + bsd.block_mode_count_1plane_always = 0; // Skipped for 3D modes + bsd.block_mode_count_1plane_selected = bm_counts[0]; + bsd.block_mode_count_1plane_2plane_selected = bm_counts[0] + bm_counts[1]; + bsd.block_mode_count_all = bm_counts[0] + bm_counts[1]; + + // Determine the texels to use for kmeans clustering. + assign_kmeans_texels(bsd); + + delete wb; +} + +/* See header for documentation. */ +void init_block_size_descriptor( + unsigned int x_texels, + unsigned int y_texels, + unsigned int z_texels, + bool can_omit_modes, + unsigned int partition_count_cutoff, + float mode_cutoff, + block_size_descriptor& bsd +) { + if (z_texels > 1) + { + construct_block_size_descriptor_3d(x_texels, y_texels, z_texels, bsd); + } + else + { + construct_block_size_descriptor_2d(x_texels, y_texels, can_omit_modes, mode_cutoff, bsd); + } + + init_partition_tables(bsd, can_omit_modes, partition_count_cutoff); +} |