// basisu_frontend.cpp // Copyright (C) 2019 Binomial LLC. All Rights Reserved. // // 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. // // TODO: // This code originally supported full ETC1 and ETC1S, so there's some legacy stuff to be cleaned up in here. // Add endpoint tiling support (where we force adjacent blocks to use the same endpoints during quantization), for a ~10% or more increase in bitrate at same SSIM. The backend already supports this. // #include "transcoder/basisu.h" #include "basisu_frontend.h" #include #include #define BASISU_FRONTEND_VERIFY(c) do { if (!(c)) handle_verify_failure(__LINE__); } while(0) namespace basisu { const uint32_t cMaxCodebookCreationThreads = 8; const uint32_t BASISU_MAX_ENDPOINT_REFINEMENT_STEPS = 3; const uint32_t BASISU_MAX_SELECTOR_REFINEMENT_STEPS = 3; const uint32_t BASISU_ENDPOINT_PARENT_CODEBOOK_SIZE = 16; const uint32_t BASISU_SELECTOR_PARENT_CODEBOOK_SIZE = 16; // TODO - How to handle internal verifies in the basisu lib static inline void handle_verify_failure(int line) { fprintf(stderr, "ERROR: basisu_frontend: verify check failed at line %i!\n", line); abort(); } bool basisu_frontend::init(const params &p) { #if 0 // HACK HACK FILE* pFile; fopen_s(&pFile, "tv.bin", "rb"); if (pFile) { debug_printf("Using tv.bin\n"); fseek(pFile, 0, SEEK_END); uint32_t size = ftell(pFile); fseek(pFile, 0, SEEK_SET); uint32_t tv = size / sizeof(vec6F_quantizer::training_vec_with_weight); std::vector v(tv); fread(&v[0], 1, sizeof(v[0]) * tv, pFile); for (uint32_t i = 0; i < tv; i++) m_endpoint_clusterizer.add_training_vec(v[i].first, v[i].second); m_endpoint_clusterizer.generate(16128); std::vector codebook; m_endpoint_clusterizer.retrieve(codebook); printf("Generated %u entries\n", (uint32_t)codebook.size()); fclose(pFile); exit(0); } #endif if (p.m_use_hybrid_selector_codebooks) { if (!p.m_pGlobal_sel_codebook) { assert(0); return false; } } debug_printf("basisu_frontend::init: Multithreaded: %u, NumEndpointClusters: %u, NumSelectorClusters: %u, Perceptual: %u, CompressionLevel: %u\n", p.m_multithreaded, p.m_max_endpoint_clusters, p.m_max_selector_clusters, p.m_perceptual, p.m_compression_level); debug_printf("Global sel codebook pal bits: %u, Global sel codebook mod bits: %u, Use hybrid selector codebook: %u, Hybrid codebook quality thresh: %f\n", p.m_num_global_sel_codebook_pal_bits, p.m_num_global_sel_codebook_mod_bits, p.m_use_hybrid_selector_codebooks, p.m_hybrid_codebook_quality_thresh); if ((p.m_max_endpoint_clusters < 1) || (p.m_max_endpoint_clusters > cMaxEndpointClusters)) return false; if ((p.m_max_selector_clusters < 1) || (p.m_max_selector_clusters > cMaxSelectorClusters)) return false; m_source_blocks.resize(0); append_vector(m_source_blocks, p.m_pSource_blocks, p.m_num_source_blocks); m_params = p; m_encoded_blocks.resize(m_params.m_num_source_blocks); memset(&m_encoded_blocks[0], 0, m_encoded_blocks.size() * sizeof(m_encoded_blocks[0])); m_num_endpoint_codebook_iterations = 1; m_num_selector_codebook_iterations = 1; switch (p.m_compression_level) { case 0: { m_endpoint_refinement = false; m_use_hierarchical_endpoint_codebooks = true; m_use_hierarchical_selector_codebooks = true; break; } case 1: { m_endpoint_refinement = true; m_use_hierarchical_endpoint_codebooks = true; m_use_hierarchical_selector_codebooks = true; break; } case 2: { m_endpoint_refinement = true; m_use_hierarchical_endpoint_codebooks = false; m_use_hierarchical_selector_codebooks = false; break; } case 3: { m_endpoint_refinement = true; m_use_hierarchical_endpoint_codebooks = true; m_use_hierarchical_selector_codebooks = true; m_num_endpoint_codebook_iterations = BASISU_MAX_ENDPOINT_REFINEMENT_STEPS; m_num_selector_codebook_iterations = BASISU_MAX_ENDPOINT_REFINEMENT_STEPS; break; } case 4: { m_endpoint_refinement = true; m_use_hierarchical_endpoint_codebooks = false; m_use_hierarchical_selector_codebooks = false; m_num_endpoint_codebook_iterations = BASISU_MAX_ENDPOINT_REFINEMENT_STEPS; m_num_selector_codebook_iterations = BASISU_MAX_ENDPOINT_REFINEMENT_STEPS; break; } case 5: { m_endpoint_refinement = true; m_use_hierarchical_endpoint_codebooks = false; m_use_hierarchical_selector_codebooks = false; m_num_endpoint_codebook_iterations = BASISU_MAX_ENDPOINT_REFINEMENT_STEPS*2; m_num_selector_codebook_iterations = BASISU_MAX_ENDPOINT_REFINEMENT_STEPS*2; break; } } if (m_params.m_disable_hierarchical_endpoint_codebooks) m_use_hierarchical_endpoint_codebooks = false; debug_printf("Endpoint refinement: %u, Hierarchical endpoint codebooks: %u, Hierarchical selector codebooks: %u, Endpoint codebook iters: %u, Selector codebook iters: %u\n", m_endpoint_refinement, m_use_hierarchical_endpoint_codebooks, m_use_hierarchical_selector_codebooks, m_num_endpoint_codebook_iterations, m_num_selector_codebook_iterations); return true; } bool basisu_frontend::compress() { debug_printf("basisu_frontend::compress\n"); m_total_blocks = m_params.m_num_source_blocks; m_total_pixels = m_total_blocks * cPixelBlockTotalPixels; init_etc1_images(); init_endpoint_training_vectors(); generate_endpoint_clusters(); for (uint32_t refine_endpoint_step = 0; refine_endpoint_step < m_num_endpoint_codebook_iterations; refine_endpoint_step++) { BASISU_FRONTEND_VERIFY(check_etc1s_constraints()); if (refine_endpoint_step) { introduce_new_endpoint_clusters(); } generate_endpoint_codebook(refine_endpoint_step); if ((m_params.m_debug_images) && (m_params.m_dump_endpoint_clusterization)) { char buf[256]; snprintf(buf, sizeof(buf), "endpoint_cluster_vis_pre_%u.png", refine_endpoint_step); dump_endpoint_clusterization_visualization(buf, false); } bool early_out = false; if (m_endpoint_refinement) { //dump_endpoint_clusterization_visualization("endpoint_clusters_before_refinement.png"); if (!refine_endpoint_clusterization()) early_out = true; if ((m_params.m_tex_type == basist::cBASISTexTypeVideoFrames) && (!refine_endpoint_step) && (m_num_endpoint_codebook_iterations == 1)) { eliminate_redundant_or_empty_endpoint_clusters(); generate_endpoint_codebook(refine_endpoint_step); } if ((m_params.m_debug_images) && (m_params.m_dump_endpoint_clusterization)) { char buf[256]; snprintf(buf, sizeof(buf), "endpoint_cluster_vis_post_%u.png", refine_endpoint_step); dump_endpoint_clusterization_visualization(buf, false); snprintf(buf, sizeof(buf), "endpoint_cluster_colors_vis_post_%u.png", refine_endpoint_step); dump_endpoint_clusterization_visualization(buf, true); } } eliminate_redundant_or_empty_endpoint_clusters(); if (m_params.m_debug_stats) debug_printf("Total endpoint clusters: %u\n", (uint32_t)m_endpoint_clusters.size()); if (early_out) break; } BASISU_FRONTEND_VERIFY(check_etc1s_constraints()); generate_block_endpoint_clusters(); create_initial_packed_texture(); generate_selector_clusters(); if (m_use_hierarchical_selector_codebooks) compute_selector_clusters_within_each_parent_cluster(); if (m_params.m_compression_level == 0) { create_optimized_selector_codebook(0); find_optimal_selector_clusters_for_each_block(); introduce_special_selector_clusters(); } else { const uint32_t num_refine_selector_steps = m_params.m_pGlobal_sel_codebook ? 1 : m_num_selector_codebook_iterations; for (uint32_t refine_selector_steps = 0; refine_selector_steps < num_refine_selector_steps; refine_selector_steps++) { create_optimized_selector_codebook(refine_selector_steps); find_optimal_selector_clusters_for_each_block(); introduce_special_selector_clusters(); if ((m_params.m_compression_level >= 3) || (m_params.m_tex_type == basist::cBASISTexTypeVideoFrames)) { if (!refine_block_endpoints_given_selectors()) break; } } } optimize_selector_codebook(); if (m_params.m_debug_stats) debug_printf("Total selector clusters: %u\n", (uint32_t)m_selector_cluster_indices.size()); finalize(); if (m_params.m_validate) { if (!validate_output()) return false; } debug_printf("basisu_frontend::compress: Done\n"); return true; } void basisu_frontend::introduce_special_selector_clusters() { debug_printf("introduce_special_selector_clusters\n"); if (m_params.m_pGlobal_sel_codebook) return; uint32_t total_blocks_relocated = 0; const uint32_t initial_selector_clusters = (uint32_t)m_selector_cluster_indices.size(); bool_vec block_relocated_flags(m_total_blocks); // Make sure the selector codebook always has pure flat blocks for each possible selector, to avoid obvious artifacts. // optimize_selector_codebook() will clean up any redundant clusters we create here. for (uint32_t sel = 0; sel < 4; sel++) { etc_block blk; clear_obj(blk); for (uint32_t j = 0; j < 16; j++) blk.set_selector(j & 3, j >> 2, sel); int k; for (k = 0; k < (int)m_optimized_cluster_selectors.size(); k++) if (m_optimized_cluster_selectors[k].get_raw_selector_bits() == blk.get_raw_selector_bits()) break; if (k < (int)m_optimized_cluster_selectors.size()) continue; debug_printf("Introducing sel %u\n", sel); const uint32_t new_selector_cluster_index = (uint32_t)m_optimized_cluster_selectors.size(); m_optimized_cluster_selectors.push_back(blk); vector_ensure_element_is_valid(m_selector_cluster_indices, new_selector_cluster_index); for (uint32_t block_index = 0; block_index < m_total_blocks; block_index++) { if (m_orig_encoded_blocks[block_index].get_raw_selector_bits() != blk.get_raw_selector_bits()) continue; // See if using flat selectors actually decreases the block's error. const uint32_t old_selector_cluster_index = m_block_selector_cluster_index[block_index]; etc_block cur_blk; const uint32_t endpoint_cluster_index = get_subblock_endpoint_cluster_index(block_index, 0); cur_blk.set_block_color5_etc1s(get_endpoint_cluster_unscaled_color(endpoint_cluster_index, false)); cur_blk.set_inten_tables_etc1s(get_endpoint_cluster_inten_table(endpoint_cluster_index, false)); cur_blk.set_raw_selector_bits(get_selector_cluster_selector_bits(old_selector_cluster_index).get_raw_selector_bits()); cur_blk.set_flip_bit(true); const uint64_t cur_err = cur_blk.evaluate_etc1_error(get_source_pixel_block(block_index).get_ptr(), m_params.m_perceptual); cur_blk.set_raw_selector_bits(blk.get_raw_selector_bits()); const uint64_t new_err = cur_blk.evaluate_etc1_error(get_source_pixel_block(block_index).get_ptr(), m_params.m_perceptual); if (new_err >= cur_err) continue; // Change the block to use the new cluster m_block_selector_cluster_index[block_index] = new_selector_cluster_index; m_selector_cluster_indices[new_selector_cluster_index].push_back(block_index); block_relocated_flags[block_index] = true; #if 0 int j = vector_find(m_selector_cluster_indices[old_selector_cluster_index], block_index); if (j >= 0) m_selector_cluster_indices[old_selector_cluster_index].erase(m_selector_cluster_indices[old_selector_cluster_index].begin() + j); #endif total_blocks_relocated++; m_encoded_blocks[block_index].set_raw_selector_bits(blk.get_raw_selector_bits()); } // block_index } // sel if (total_blocks_relocated) { debug_printf("Fixing selector codebook\n"); for (int selector_cluster_index = 0; selector_cluster_index < (int)initial_selector_clusters; selector_cluster_index++) { uint_vec& block_indices = m_selector_cluster_indices[selector_cluster_index]; uint32_t dst_ofs = 0; for (uint32_t i = 0; i < block_indices.size(); i++) { const uint32_t block_index = block_indices[i]; if (!block_relocated_flags[block_index]) block_indices[dst_ofs++] = block_index; } block_indices.resize(dst_ofs); } } debug_printf("Total blocks relocated to new flat selector clusters: %u\n", total_blocks_relocated); } void basisu_frontend::optimize_selector_codebook() { debug_printf("optimize_selector_codebook\n"); const uint32_t orig_total_selector_clusters = (uint32_t)m_optimized_cluster_selectors.size(); bool_vec selector_cluster_was_used(m_optimized_cluster_selectors.size()); for (uint32_t i = 0; i < m_total_blocks; i++) selector_cluster_was_used[m_block_selector_cluster_index[i]] = true; int_vec old_to_new(m_optimized_cluster_selectors.size()); int_vec new_to_old; uint32_t total_new_entries = 0; std::unordered_map selector_hashmap; for (int i = 0; i < static_cast(m_optimized_cluster_selectors.size()); i++) { if (!selector_cluster_was_used[i]) { old_to_new[i] = -1; continue; } const uint32_t raw_selector_bits = m_optimized_cluster_selectors[i].get_raw_selector_bits(); auto find_res = selector_hashmap.insert(std::make_pair(raw_selector_bits, total_new_entries)); if (!find_res.second) { old_to_new[i] = (find_res.first)->second; continue; } old_to_new[i] = total_new_entries++; new_to_old.push_back(i); } for (uint32_t i = 0; i < m_block_selector_cluster_index.size(); i++) { BASISU_FRONTEND_VERIFY((old_to_new[m_block_selector_cluster_index[i]] >= 0) && (old_to_new[m_block_selector_cluster_index[i]] < (int)total_new_entries)); m_block_selector_cluster_index[i] = old_to_new[m_block_selector_cluster_index[i]]; } std::vector new_optimized_cluster_selectors(m_optimized_cluster_selectors.size() ? total_new_entries : 0); basist::etc1_global_selector_codebook_entry_id_vec new_optimized_cluster_selector_global_cb_ids(m_optimized_cluster_selector_global_cb_ids.size() ? total_new_entries : 0); std::vector new_selector_cluster_indices(m_selector_cluster_indices.size() ? total_new_entries : 0); bool_vec new_selector_cluster_uses_global_cb(m_selector_cluster_uses_global_cb.size() ? total_new_entries : 0); for (uint32_t i = 0; i < total_new_entries; i++) { if (m_optimized_cluster_selectors.size()) new_optimized_cluster_selectors[i] = m_optimized_cluster_selectors[new_to_old[i]]; if (m_optimized_cluster_selector_global_cb_ids.size()) new_optimized_cluster_selector_global_cb_ids[i] = m_optimized_cluster_selector_global_cb_ids[new_to_old[i]]; if (m_selector_cluster_indices.size()) new_selector_cluster_indices[i] = m_selector_cluster_indices[new_to_old[i]]; if (m_selector_cluster_uses_global_cb.size()) new_selector_cluster_uses_global_cb[i] = m_selector_cluster_uses_global_cb[new_to_old[i]]; } m_optimized_cluster_selectors.swap(new_optimized_cluster_selectors); m_optimized_cluster_selector_global_cb_ids.swap(new_optimized_cluster_selector_global_cb_ids); m_selector_cluster_indices.swap(new_selector_cluster_indices); m_selector_cluster_uses_global_cb.swap(new_selector_cluster_uses_global_cb); debug_printf("optimize_selector_codebook: Before: %u After: %u\n", orig_total_selector_clusters, total_new_entries); } void basisu_frontend::init_etc1_images() { debug_printf("basisu_frontend::init_etc1_images\n"); m_etc1_blocks_etc1s.resize(m_total_blocks); const uint32_t N = 4096; for (uint32_t block_index_iter = 0; block_index_iter < m_total_blocks; block_index_iter += N) { const uint32_t first_index = block_index_iter; const uint32_t last_index = minimum(m_total_blocks, first_index + N); m_params.m_pJob_pool->add_job( [this, first_index, last_index] { for (uint32_t block_index = first_index; block_index < last_index; block_index++) { const pixel_block &source_blk = get_source_pixel_block(block_index); etc1_optimizer optimizer; etc1_optimizer::params optimizer_params; etc1_optimizer::results optimizer_results; if (m_params.m_compression_level == 0) optimizer_params.m_quality = cETCQualityFast; else if (m_params.m_compression_level == BASISU_MAX_COMPRESSION_LEVEL) optimizer_params.m_quality = cETCQualityUber; optimizer_params.m_num_src_pixels = 16; optimizer_params.m_pSrc_pixels = source_blk.get_ptr(); optimizer_params.m_perceptual = m_params.m_perceptual; uint8_t selectors[16]; optimizer_results.m_pSelectors = selectors; optimizer_results.m_n = 16; optimizer.init(optimizer_params, optimizer_results); optimizer.compute(); etc_block &blk = m_etc1_blocks_etc1s[block_index]; memset(&blk, 0, sizeof(blk)); blk.set_block_color5_etc1s(optimizer_results.m_block_color_unscaled); blk.set_inten_tables_etc1s(optimizer_results.m_block_inten_table); blk.set_flip_bit(true); for (uint32_t y = 0; y < 4; y++) for (uint32_t x = 0; x < 4; x++) blk.set_selector(x, y, selectors[x + y * 4]); } } ); } m_params.m_pJob_pool->wait_for_all(); } void basisu_frontend::init_endpoint_training_vectors() { debug_printf("init_endpoint_training_vectors\n"); vec6F_quantizer::array_of_weighted_training_vecs &training_vecs = m_endpoint_clusterizer.get_training_vecs(); training_vecs.resize(m_total_blocks * 2); const uint32_t N = 16384; for (uint32_t block_index_iter = 0; block_index_iter < m_total_blocks; block_index_iter += N) { const uint32_t first_index = block_index_iter; const uint32_t last_index = minimum(m_total_blocks, first_index + N); m_params.m_pJob_pool->add_job( [this, first_index, last_index, &training_vecs] { for (uint32_t block_index = first_index; block_index < last_index; block_index++) { const etc_block &blk = m_etc1_blocks_etc1s[block_index]; color_rgba block_colors[2]; blk.get_block_low_high_colors(block_colors, 0); vec6F v; v[0] = block_colors[0].r * (1.0f / 255.0f); v[1] = block_colors[0].g * (1.0f / 255.0f); v[2] = block_colors[0].b * (1.0f / 255.0f); v[3] = block_colors[1].r * (1.0f / 255.0f); v[4] = block_colors[1].g * (1.0f / 255.0f); v[5] = block_colors[1].b * (1.0f / 255.0f); training_vecs[block_index * 2 + 0] = std::make_pair(v, 1); training_vecs[block_index * 2 + 1] = std::make_pair(v, 1); } // block_index; } ); } // block_index_iter m_params.m_pJob_pool->wait_for_all(); } void basisu_frontend::generate_endpoint_clusters() { debug_printf("Begin endpoint quantization\n"); const uint32_t parent_codebook_size = (m_params.m_max_endpoint_clusters >= 256) ? BASISU_ENDPOINT_PARENT_CODEBOOK_SIZE : 0; uint32_t max_threads = 0; max_threads = m_params.m_multithreaded ? minimum(std::thread::hardware_concurrency(), cMaxCodebookCreationThreads) : 0; debug_printf("Using %u threads to create codebook\n", max_threads); bool status = generate_hierarchical_codebook_threaded(m_endpoint_clusterizer, m_params.m_max_endpoint_clusters, m_use_hierarchical_endpoint_codebooks ? parent_codebook_size : 0, m_endpoint_clusters, m_endpoint_parent_clusters, max_threads, m_params.m_pJob_pool); BASISU_FRONTEND_VERIFY(status); if (m_use_hierarchical_endpoint_codebooks) { if (!m_endpoint_parent_clusters.size()) { m_endpoint_parent_clusters.resize(0); m_endpoint_parent_clusters.resize(1); for (uint32_t i = 0; i < m_total_blocks; i++) { m_endpoint_parent_clusters[0].push_back(i*2); m_endpoint_parent_clusters[0].push_back(i*2+1); } } BASISU_ASSUME(BASISU_ENDPOINT_PARENT_CODEBOOK_SIZE <= UINT8_MAX); m_block_parent_endpoint_cluster.resize(0); m_block_parent_endpoint_cluster.resize(m_total_blocks); vector_set_all(m_block_parent_endpoint_cluster, 0xFF); for (uint32_t parent_cluster_index = 0; parent_cluster_index < m_endpoint_parent_clusters.size(); parent_cluster_index++) { const uint_vec &cluster = m_endpoint_parent_clusters[parent_cluster_index]; for (uint32_t j = 0; j < cluster.size(); j++) { const uint32_t block_index = cluster[j] >> 1; m_block_parent_endpoint_cluster[block_index] = static_cast(parent_cluster_index); } } for (uint32_t i = 0; i < m_total_blocks; i++) { BASISU_FRONTEND_VERIFY(m_block_parent_endpoint_cluster[i] != 0xFF); } // Ensure that all the blocks within each cluster are all in the same parent cluster, or something is very wrong. for (uint32_t cluster_index = 0; cluster_index < m_endpoint_clusters.size(); cluster_index++) { const uint_vec &cluster = m_endpoint_clusters[cluster_index]; uint32_t parent_cluster_index = 0; for (uint32_t j = 0; j < cluster.size(); j++) { const uint32_t block_index = cluster[j] >> 1; if (!j) { parent_cluster_index = m_block_parent_endpoint_cluster[block_index]; } else { BASISU_FRONTEND_VERIFY(m_block_parent_endpoint_cluster[block_index] == parent_cluster_index); } } } } if (m_params.m_debug_stats) debug_printf("Total endpoint clusters: %u, parent clusters: %u\n", (uint32_t)m_endpoint_clusters.size(), (uint32_t)m_endpoint_parent_clusters.size()); } void basisu_frontend::generate_block_endpoint_clusters() { m_block_endpoint_clusters_indices.resize(m_total_blocks); for (int cluster_index = 0; cluster_index < static_cast(m_endpoint_clusters.size()); cluster_index++) { const std::vector& cluster_indices = m_endpoint_clusters[cluster_index]; for (uint32_t cluster_indices_iter = 0; cluster_indices_iter < cluster_indices.size(); cluster_indices_iter++) { const uint32_t block_index = cluster_indices[cluster_indices_iter] >> 1; const uint32_t subblock_index = cluster_indices[cluster_indices_iter] & 1; m_block_endpoint_clusters_indices[block_index][subblock_index] = cluster_index; } // cluster_indices_iter } for (uint32_t block_index = 0; block_index < m_total_blocks; block_index++) { uint32_t cluster_0 = m_block_endpoint_clusters_indices[block_index][0]; uint32_t cluster_1 = m_block_endpoint_clusters_indices[block_index][1]; BASISU_FRONTEND_VERIFY(cluster_0 == cluster_1); } } void basisu_frontend::compute_endpoint_clusters_within_each_parent_cluster() { generate_block_endpoint_clusters(); m_endpoint_clusters_within_each_parent_cluster.resize(0); m_endpoint_clusters_within_each_parent_cluster.resize(m_endpoint_parent_clusters.size()); for (uint32_t block_index = 0; block_index < m_total_blocks; block_index++) { const uint32_t cluster_index = m_block_endpoint_clusters_indices[block_index][0]; const uint32_t parent_cluster_index = m_block_parent_endpoint_cluster[block_index]; m_endpoint_clusters_within_each_parent_cluster[parent_cluster_index].push_back(cluster_index); } for (uint32_t i = 0; i < m_endpoint_clusters_within_each_parent_cluster.size(); i++) { uint_vec &cluster_indices = m_endpoint_clusters_within_each_parent_cluster[i]; BASISU_FRONTEND_VERIFY(cluster_indices.size()); vector_sort(cluster_indices); auto last = std::unique(cluster_indices.begin(), cluster_indices.end()); cluster_indices.erase(last, cluster_indices.end()); } } void basisu_frontend::compute_endpoint_subblock_error_vec() { m_subblock_endpoint_quant_err_vec.resize(0); const uint32_t N = 512; for (uint32_t cluster_index_iter = 0; cluster_index_iter < m_endpoint_clusters.size(); cluster_index_iter += N) { const uint32_t first_index = cluster_index_iter; const uint32_t last_index = minimum((uint32_t)m_endpoint_clusters.size(), cluster_index_iter + N); m_params.m_pJob_pool->add_job( [this, first_index, last_index] { for (uint32_t cluster_index = first_index; cluster_index < last_index; cluster_index++) { const std::vector& cluster_indices = m_endpoint_clusters[cluster_index]; assert(cluster_indices.size()); for (uint32_t cluster_indices_iter = 0; cluster_indices_iter < cluster_indices.size(); cluster_indices_iter++) { std::vector cluster_pixels(8); const uint32_t block_index = cluster_indices[cluster_indices_iter] >> 1; const uint32_t subblock_index = cluster_indices[cluster_indices_iter] & 1; const bool flipped = true; const color_rgba *pSource_block_pixels = get_source_pixel_block(block_index).get_ptr(); for (uint32_t pixel_index = 0; pixel_index < 8; pixel_index++) { cluster_pixels[pixel_index] = pSource_block_pixels[g_etc1_pixel_indices[flipped][subblock_index][pixel_index]]; } const endpoint_cluster_etc_params &etc_params = m_endpoint_cluster_etc_params[cluster_index]; assert(etc_params.m_valid); color_rgba block_colors[4]; etc_block::get_block_colors5(block_colors, etc_params.m_color_unscaled[0], etc_params.m_inten_table[0], true); uint64_t total_err = 0; for (uint32_t i = 0; i < 8; i++) { const color_rgba &c = cluster_pixels[i]; uint64_t best_err = UINT64_MAX; //uint32_t best_index = 0; for (uint32_t s = 0; s < 4; s++) { uint64_t err = color_distance(m_params.m_perceptual, c, block_colors[s], false); if (err < best_err) { best_err = err; //best_index = s; } } total_err += best_err; } subblock_endpoint_quant_err quant_err; quant_err.m_total_err = total_err; quant_err.m_cluster_index = cluster_index; quant_err.m_cluster_subblock_index = cluster_indices_iter; quant_err.m_block_index = block_index; quant_err.m_subblock_index = subblock_index; { std::lock_guard lock(m_lock); m_subblock_endpoint_quant_err_vec.push_back(quant_err); } } } // cluster_index } ); } // cluster_index_iter m_params.m_pJob_pool->wait_for_all(); vector_sort(m_subblock_endpoint_quant_err_vec); } void basisu_frontend::introduce_new_endpoint_clusters() { debug_printf("introduce_new_endpoint_clusters\n"); generate_block_endpoint_clusters(); int num_new_endpoint_clusters = m_params.m_max_endpoint_clusters - (uint32_t)m_endpoint_clusters.size(); if (num_new_endpoint_clusters <= 0) return; compute_endpoint_subblock_error_vec(); const uint32_t num_orig_endpoint_clusters = (uint32_t)m_endpoint_clusters.size(); std::unordered_set training_vector_was_relocated; uint_vec cluster_sizes(num_orig_endpoint_clusters); for (uint32_t i = 0; i < num_orig_endpoint_clusters; i++) cluster_sizes[i] = (uint32_t)m_endpoint_clusters[i].size(); std::unordered_set ignore_cluster; while (num_new_endpoint_clusters) { if (m_subblock_endpoint_quant_err_vec.size() == 0) break; subblock_endpoint_quant_err subblock_to_move(m_subblock_endpoint_quant_err_vec.back()); m_subblock_endpoint_quant_err_vec.pop_back(); if (unordered_set_contains(ignore_cluster, subblock_to_move.m_cluster_index)) continue; uint32_t training_vector_index = subblock_to_move.m_block_index * 2 + subblock_to_move.m_subblock_index; if (cluster_sizes[subblock_to_move.m_cluster_index] <= 2) continue; if (unordered_set_contains(training_vector_was_relocated, training_vector_index)) continue; if (unordered_set_contains(training_vector_was_relocated, training_vector_index ^ 1)) continue; #if 0 const uint32_t block_index = subblock_to_move.m_block_index; const etc_block& blk = m_etc1_blocks_etc1s[block_index]; uint32_t ls, hs; blk.get_selector_range(ls, hs); if (ls != hs) continue; #endif const uint32_t new_endpoint_cluster_index = (uint32_t)m_endpoint_clusters.size(); enlarge_vector(m_endpoint_clusters, 1)->push_back(training_vector_index); enlarge_vector(m_endpoint_cluster_etc_params, 1); assert(m_endpoint_clusters.size() == m_endpoint_cluster_etc_params.size()); training_vector_was_relocated.insert(training_vector_index); m_endpoint_clusters.back().push_back(training_vector_index ^ 1); training_vector_was_relocated.insert(training_vector_index ^ 1); BASISU_FRONTEND_VERIFY(cluster_sizes[subblock_to_move.m_cluster_index] >= 2); cluster_sizes[subblock_to_move.m_cluster_index] -= 2; ignore_cluster.insert(subblock_to_move.m_cluster_index); num_new_endpoint_clusters--; } for (uint32_t i = 0; i < num_orig_endpoint_clusters; i++) { uint_vec &cluster_indices = m_endpoint_clusters[i]; uint_vec new_cluster_indices; for (uint32_t j = 0; j < cluster_indices.size(); j++) { uint32_t training_vector_index = cluster_indices[j]; if (!unordered_set_contains(training_vector_was_relocated, training_vector_index)) new_cluster_indices.push_back(training_vector_index); } if (cluster_indices.size() != new_cluster_indices.size()) { BASISU_FRONTEND_VERIFY(new_cluster_indices.size() > 0); cluster_indices.swap(new_cluster_indices); } } generate_block_endpoint_clusters(); } // Given each endpoint cluster, gather all the block pixels which are in that cluster and compute optimized ETC1S endpoints for them. // TODO: Don't optimize endpoint clusters which haven't changed. void basisu_frontend::generate_endpoint_codebook(uint32_t step) { debug_printf("generate_endpoint_codebook\n"); m_endpoint_cluster_etc_params.resize(m_endpoint_clusters.size()); const uint32_t N = 128; for (uint32_t cluster_index_iter = 0; cluster_index_iter < m_endpoint_clusters.size(); cluster_index_iter += N) { const uint32_t first_index = cluster_index_iter; const uint32_t last_index = minimum((uint32_t)m_endpoint_clusters.size(), cluster_index_iter + N); m_params.m_pJob_pool->add_job( [this, first_index, last_index, step ] { for (uint32_t cluster_index = first_index; cluster_index < last_index; cluster_index++) { const std::vector& cluster_indices = m_endpoint_clusters[cluster_index]; BASISU_FRONTEND_VERIFY(cluster_indices.size()); const uint32_t total_pixels = (uint32_t)cluster_indices.size() * 8; std::vector cluster_pixels(total_pixels); for (uint32_t cluster_indices_iter = 0; cluster_indices_iter < cluster_indices.size(); cluster_indices_iter++) { const uint32_t block_index = cluster_indices[cluster_indices_iter] >> 1; const uint32_t subblock_index = cluster_indices[cluster_indices_iter] & 1; const bool flipped = true; const color_rgba *pBlock_pixels = get_source_pixel_block(block_index).get_ptr(); for (uint32_t pixel_index = 0; pixel_index < 8; pixel_index++) { const color_rgba &c = pBlock_pixels[g_etc1_pixel_indices[flipped][subblock_index][pixel_index]]; cluster_pixels[cluster_indices_iter * 8 + pixel_index] = c; } } endpoint_cluster_etc_params new_subblock_params; { etc1_optimizer optimizer; etc1_solution_coordinates solutions[2]; etc1_optimizer::params cluster_optimizer_params; cluster_optimizer_params.m_num_src_pixels = total_pixels; cluster_optimizer_params.m_pSrc_pixels = &cluster_pixels[0]; cluster_optimizer_params.m_use_color4 = false; cluster_optimizer_params.m_perceptual = m_params.m_perceptual; if (m_params.m_compression_level == 0) cluster_optimizer_params.m_quality = cETCQualityMedium; else if (m_params.m_compression_level == BASISU_MAX_COMPRESSION_LEVEL) cluster_optimizer_params.m_quality = cETCQualityUber; etc1_optimizer::results cluster_optimizer_results; std::vector cluster_selectors(total_pixels); cluster_optimizer_results.m_n = total_pixels; cluster_optimizer_results.m_pSelectors = &cluster_selectors[0]; optimizer.init(cluster_optimizer_params, cluster_optimizer_results); optimizer.compute(); new_subblock_params.m_color_unscaled[0] = cluster_optimizer_results.m_block_color_unscaled; new_subblock_params.m_inten_table[0] = cluster_optimizer_results.m_block_inten_table; new_subblock_params.m_color_error[0] = cluster_optimizer_results.m_error; } endpoint_cluster_etc_params &prev_etc_params = m_endpoint_cluster_etc_params[cluster_index]; bool use_new_subblock_params = false; if ((!step) || (!prev_etc_params.m_valid)) use_new_subblock_params = true; else { assert(prev_etc_params.m_valid); uint64_t total_prev_err = 0; { color_rgba block_colors[4]; etc_block::get_block_colors5(block_colors, prev_etc_params.m_color_unscaled[0], prev_etc_params.m_inten_table[0], false); uint64_t total_err = 0; for (uint32_t i = 0; i < total_pixels; i++) { const color_rgba &c = cluster_pixels[i]; uint64_t best_err = UINT64_MAX; //uint32_t best_index = 0; for (uint32_t s = 0; s < 4; s++) { uint64_t err = color_distance(m_params.m_perceptual, c, block_colors[s], false); if (err < best_err) { best_err = err; //best_index = s; } } total_err += best_err; } total_prev_err += total_err; } // See if we should update this cluster's endpoints (if the error has actually fallen) if (total_prev_err > new_subblock_params.m_color_error[0]) { use_new_subblock_params = true; } } if (use_new_subblock_params) { new_subblock_params.m_valid = true; prev_etc_params = new_subblock_params; } } // cluster_index } ); } // cluster_index_iter m_params.m_pJob_pool->wait_for_all(); } bool basisu_frontend::check_etc1s_constraints() const { std::vector block_clusters(m_total_blocks); for (int cluster_index = 0; cluster_index < static_cast(m_endpoint_clusters.size()); cluster_index++) { const std::vector& cluster_indices = m_endpoint_clusters[cluster_index]; for (uint32_t cluster_indices_iter = 0; cluster_indices_iter < cluster_indices.size(); cluster_indices_iter++) { const uint32_t block_index = cluster_indices[cluster_indices_iter] >> 1; const uint32_t subblock_index = cluster_indices[cluster_indices_iter] & 1; block_clusters[block_index][subblock_index] = cluster_index; } // cluster_indices_iter } for (uint32_t i = 0; i < m_total_blocks; i++) { if (block_clusters[i][0] != block_clusters[i][1]) return false; } return true; } uint32_t basisu_frontend::refine_endpoint_clusterization() { debug_printf("refine_endpoint_clusterization\n"); if (m_use_hierarchical_endpoint_codebooks) compute_endpoint_clusters_within_each_parent_cluster(); std::vector block_clusters(m_total_blocks); for (int cluster_index = 0; cluster_index < static_cast(m_endpoint_clusters.size()); cluster_index++) { const std::vector& cluster_indices = m_endpoint_clusters[cluster_index]; for (uint32_t cluster_indices_iter = 0; cluster_indices_iter < cluster_indices.size(); cluster_indices_iter++) { const uint32_t block_index = cluster_indices[cluster_indices_iter] >> 1; const uint32_t subblock_index = cluster_indices[cluster_indices_iter] & 1; block_clusters[block_index][subblock_index] = cluster_index; } // cluster_indices_iter } //---------------------------------------------------------- // Create a new endpoint clusterization uint_vec best_cluster_indices(m_total_blocks); const uint32_t N = 1024; for (uint32_t block_index_iter = 0; block_index_iter < m_total_blocks; block_index_iter += N) { const uint32_t first_index = block_index_iter; const uint32_t last_index = minimum(m_total_blocks, first_index + N); m_params.m_pJob_pool->add_job( [this, first_index, last_index, &best_cluster_indices, &block_clusters] { for (uint32_t block_index = first_index; block_index < last_index; block_index++) { const bool is_flipped = true; const uint32_t cluster_index = block_clusters[block_index][0]; BASISU_FRONTEND_VERIFY(cluster_index == block_clusters[block_index][1]); const color_rgba *subblock_pixels = get_source_pixel_block(block_index).get_ptr(); const uint32_t num_subblock_pixels = 16; uint64_t best_cluster_err = UINT64_MAX; uint32_t best_cluster_index = 0; const uint32_t block_parent_endpoint_cluster_index = m_block_parent_endpoint_cluster.size() ? m_block_parent_endpoint_cluster[block_index] : 0; const uint_vec *pCluster_indices = m_endpoint_clusters_within_each_parent_cluster.size() ? &m_endpoint_clusters_within_each_parent_cluster[block_parent_endpoint_cluster_index] : nullptr; const uint32_t total_clusters = m_use_hierarchical_endpoint_codebooks ? (uint32_t)pCluster_indices->size() : (uint32_t)m_endpoint_clusters.size(); for (uint32_t i = 0; i < total_clusters; i++) { const uint32_t cluster_iter = m_use_hierarchical_endpoint_codebooks ? (*pCluster_indices)[i] : i; color_rgba cluster_etc_base_color(m_endpoint_cluster_etc_params[cluster_iter].m_color_unscaled[0]); uint32_t cluster_etc_inten = m_endpoint_cluster_etc_params[cluster_iter].m_inten_table[0]; uint64_t total_err = 0; const uint32_t low_selector = 0;//subblock_etc_params_vec[j].m_low_selectors[0]; const uint32_t high_selector = 3;//subblock_etc_params_vec[j].m_high_selectors[0]; color_rgba subblock_colors[4]; // Can't assign it here - may result in too much error when selector quant occurs if (cluster_etc_inten > m_endpoint_cluster_etc_params[cluster_index].m_inten_table[0]) { total_err = UINT64_MAX; goto skip_cluster; } etc_block::get_block_colors5(subblock_colors, cluster_etc_base_color, cluster_etc_inten); for (uint32_t p = 0; p < num_subblock_pixels; p++) { uint64_t best_err = UINT64_MAX; for (uint32_t r = low_selector; r <= high_selector; r++) { uint64_t err = color_distance(m_params.m_perceptual, subblock_pixels[p], subblock_colors[r], false); best_err = minimum(best_err, err); if (!best_err) break; } total_err += best_err; if (total_err > best_cluster_err) break; } // p skip_cluster: if ((total_err < best_cluster_err) || ((cluster_iter == cluster_index) && (total_err == best_cluster_err))) { best_cluster_err = total_err; best_cluster_index = cluster_iter; if (!best_cluster_err) break; } } // j best_cluster_indices[block_index] = best_cluster_index; } // block_index } ); } // block_index_iter m_params.m_pJob_pool->wait_for_all(); std::vector > optimized_endpoint_clusters(m_endpoint_clusters.size()); uint32_t total_subblocks_reassigned = 0; for (uint32_t block_index = 0; block_index < m_total_blocks; block_index++) { const uint32_t training_vector_index = block_index * 2 + 0; const uint32_t orig_cluster_index = block_clusters[block_index][0]; const uint32_t best_cluster_index = best_cluster_indices[block_index]; optimized_endpoint_clusters[best_cluster_index].push_back(training_vector_index); optimized_endpoint_clusters[best_cluster_index].push_back(training_vector_index + 1); if (best_cluster_index != orig_cluster_index) { total_subblocks_reassigned++; } } debug_printf("total_subblocks_reassigned: %u\n", total_subblocks_reassigned); m_endpoint_clusters = optimized_endpoint_clusters; return total_subblocks_reassigned; } void basisu_frontend::eliminate_redundant_or_empty_endpoint_clusters() { debug_printf("eliminate_redundant_or_empty_endpoint_clusters\n"); // Step 1: Sort endpoint clusters by the base colors/intens uint_vec sorted_endpoint_cluster_indices(m_endpoint_clusters.size()); for (uint32_t i = 0; i < m_endpoint_clusters.size(); i++) sorted_endpoint_cluster_indices[i] = i; indirect_sort((uint32_t)m_endpoint_clusters.size(), &sorted_endpoint_cluster_indices[0], &m_endpoint_cluster_etc_params[0]); std::vector > new_endpoint_clusters(m_endpoint_clusters.size()); std::vector new_subblock_etc_params(m_endpoint_clusters.size()); for (uint32_t i = 0; i < m_endpoint_clusters.size(); i++) { uint32_t j = sorted_endpoint_cluster_indices[i]; new_endpoint_clusters[i] = m_endpoint_clusters[j]; new_subblock_etc_params[i] = m_endpoint_cluster_etc_params[j]; } new_endpoint_clusters.swap(m_endpoint_clusters); new_subblock_etc_params.swap(m_endpoint_cluster_etc_params); // Step 2: Eliminate redundant endpoint clusters, or empty endpoint clusters new_endpoint_clusters.resize(0); new_subblock_etc_params.resize(0); for (int i = 0; i < (int)m_endpoint_clusters.size(); ) { if (!m_endpoint_clusters[i].size()) { i++; continue; } int j; for (j = i + 1; j < (int)m_endpoint_clusters.size(); j++) { if (!(m_endpoint_cluster_etc_params[i] == m_endpoint_cluster_etc_params[j])) break; } new_endpoint_clusters.push_back(m_endpoint_clusters[i]); new_subblock_etc_params.push_back(m_endpoint_cluster_etc_params[i]); for (int k = i + 1; k < j; k++) { append_vector(new_endpoint_clusters.back(), m_endpoint_clusters[k]); } i = j; } if (m_endpoint_clusters.size() != new_endpoint_clusters.size()) { if (m_params.m_debug_stats) debug_printf("Eliminated %u redundant or empty clusters\n", (uint32_t)(m_endpoint_clusters.size() - new_endpoint_clusters.size())); m_endpoint_clusters.swap(new_endpoint_clusters); m_endpoint_cluster_etc_params.swap(new_subblock_etc_params); } } void basisu_frontend::create_initial_packed_texture() { debug_printf("create_initial_packed_texture\n"); const uint32_t N = 4096; for (uint32_t block_index_iter = 0; block_index_iter < m_total_blocks; block_index_iter += N) { const uint32_t first_index = block_index_iter; const uint32_t last_index = minimum(m_total_blocks, first_index + N); m_params.m_pJob_pool->add_job( [this, first_index, last_index] { for (uint32_t block_index = first_index; block_index < last_index; block_index++) { uint32_t cluster0 = m_block_endpoint_clusters_indices[block_index][0]; uint32_t cluster1 = m_block_endpoint_clusters_indices[block_index][1]; BASISU_FRONTEND_VERIFY(cluster0 == cluster1); const color_rgba *pSource_pixels = get_source_pixel_block(block_index).get_ptr(); etc_block &blk = m_encoded_blocks[block_index]; color_rgba unscaled[2] = { m_endpoint_cluster_etc_params[cluster0].m_color_unscaled[0], m_endpoint_cluster_etc_params[cluster1].m_color_unscaled[0] }; uint32_t inten[2] = { m_endpoint_cluster_etc_params[cluster0].m_inten_table[0], m_endpoint_cluster_etc_params[cluster1].m_inten_table[0] }; blk.set_block_color5(unscaled[0], unscaled[1]); blk.set_flip_bit(true); blk.set_inten_table(0, inten[0]); blk.set_inten_table(1, inten[1]); blk.determine_selectors(pSource_pixels, m_params.m_perceptual); } // block_index } ); } // block_index_iter m_params.m_pJob_pool->wait_for_all(); m_orig_encoded_blocks = m_encoded_blocks; } void basisu_frontend::compute_selector_clusters_within_each_parent_cluster() { uint_vec block_selector_cluster_indices(m_total_blocks); for (int cluster_index = 0; cluster_index < static_cast(m_selector_cluster_indices.size()); cluster_index++) { const std::vector& cluster_indices = m_selector_cluster_indices[cluster_index]; for (uint32_t cluster_indices_iter = 0; cluster_indices_iter < cluster_indices.size(); cluster_indices_iter++) { const uint32_t block_index = cluster_indices[cluster_indices_iter]; block_selector_cluster_indices[block_index] = cluster_index; } // cluster_indices_iter } // cluster_index m_selector_clusters_within_each_parent_cluster.resize(0); m_selector_clusters_within_each_parent_cluster.resize(m_selector_parent_cluster_indices.size()); for (uint32_t block_index = 0; block_index < m_total_blocks; block_index++) { const uint32_t cluster_index = block_selector_cluster_indices[block_index]; const uint32_t parent_cluster_index = m_block_parent_selector_cluster[block_index]; m_selector_clusters_within_each_parent_cluster[parent_cluster_index].push_back(cluster_index); } for (uint32_t i = 0; i < m_selector_clusters_within_each_parent_cluster.size(); i++) { uint_vec &cluster_indices = m_selector_clusters_within_each_parent_cluster[i]; BASISU_FRONTEND_VERIFY(cluster_indices.size()); vector_sort(cluster_indices); auto last = std::unique(cluster_indices.begin(), cluster_indices.end()); cluster_indices.erase(last, cluster_indices.end()); } } void basisu_frontend::generate_selector_clusters() { debug_printf("generate_selector_clusters\n"); typedef vec<16, float> vec16F; typedef tree_vector_quant vec16F_clusterizer; vec16F_clusterizer::array_of_weighted_training_vecs training_vecs(m_total_blocks); const uint32_t N = 4096; for (uint32_t block_index_iter = 0; block_index_iter < m_total_blocks; block_index_iter += N) { const uint32_t first_index = block_index_iter; const uint32_t last_index = minimum(m_total_blocks, first_index + N); m_params.m_pJob_pool->add_job( [this, first_index, last_index, &training_vecs] { for (uint32_t block_index = first_index; block_index < last_index; block_index++) { const etc_block &blk = m_encoded_blocks[block_index]; vec16F v; for (uint32_t y = 0; y < 4; y++) for (uint32_t x = 0; x < 4; x++) v[x + y * 4] = static_cast(blk.get_selector(x, y)); const uint32_t subblock_index = (blk.get_inten_table(0) > blk.get_inten_table(1)) ? 0 : 1; color_rgba block_colors[2]; blk.get_block_low_high_colors(block_colors, subblock_index); const uint32_t dist = color_distance(m_params.m_perceptual, block_colors[0], block_colors[1], false); const uint32_t cColorDistToWeight = 300; const uint32_t cMaxWeight = 4096; uint32_t weight = clamp(dist / cColorDistToWeight, 1, cMaxWeight); training_vecs[block_index].first = v; training_vecs[block_index].second = weight; } // block_index } ); } // block_index_iter m_params.m_pJob_pool->wait_for_all(); vec16F_clusterizer selector_clusterizer; for (uint32_t i = 0; i < m_total_blocks; i++) selector_clusterizer.add_training_vec(training_vecs[i].first, training_vecs[i].second); const uint32_t parent_codebook_size = (m_params.m_max_selector_clusters >= 256) ? BASISU_SELECTOR_PARENT_CODEBOOK_SIZE : 0; uint32_t max_threads = 0; max_threads = m_params.m_multithreaded ? minimum(std::thread::hardware_concurrency(), cMaxCodebookCreationThreads) : 0; bool status = generate_hierarchical_codebook_threaded(selector_clusterizer, m_params.m_max_selector_clusters, m_use_hierarchical_selector_codebooks ? parent_codebook_size : 0, m_selector_cluster_indices, m_selector_parent_cluster_indices, max_threads, m_params.m_pJob_pool); BASISU_FRONTEND_VERIFY(status); if (m_use_hierarchical_selector_codebooks) { if (!m_selector_parent_cluster_indices.size()) { m_selector_parent_cluster_indices.resize(0); m_selector_parent_cluster_indices.resize(1); for (uint32_t i = 0; i < m_total_blocks; i++) m_selector_parent_cluster_indices[0].push_back(i); } BASISU_ASSUME(BASISU_SELECTOR_PARENT_CODEBOOK_SIZE <= UINT8_MAX); m_block_parent_selector_cluster.resize(0); m_block_parent_selector_cluster.resize(m_total_blocks); vector_set_all(m_block_parent_selector_cluster, 0xFF); for (uint32_t parent_cluster_index = 0; parent_cluster_index < m_selector_parent_cluster_indices.size(); parent_cluster_index++) { const uint_vec &cluster = m_selector_parent_cluster_indices[parent_cluster_index]; for (uint32_t j = 0; j < cluster.size(); j++) m_block_parent_selector_cluster[cluster[j]] = static_cast(parent_cluster_index); } for (uint32_t i = 0; i < m_total_blocks; i++) { BASISU_FRONTEND_VERIFY(m_block_parent_selector_cluster[i] != 0xFF); } // Ensure that all the blocks within each cluster are all in the same parent cluster, or something is very wrong. for (uint32_t cluster_index = 0; cluster_index < m_selector_cluster_indices.size(); cluster_index++) { const uint_vec &cluster = m_selector_cluster_indices[cluster_index]; uint32_t parent_cluster_index = 0; for (uint32_t j = 0; j < cluster.size(); j++) { const uint32_t block_index = cluster[j]; if (!j) { parent_cluster_index = m_block_parent_selector_cluster[block_index]; } else { BASISU_FRONTEND_VERIFY(m_block_parent_selector_cluster[block_index] == parent_cluster_index); } } } } debug_printf("Total selector clusters: %u, total parent selector clusters: %u\n", (uint32_t)m_selector_cluster_indices.size(), (uint32_t)m_selector_parent_cluster_indices.size()); } void basisu_frontend::create_optimized_selector_codebook(uint32_t iter) { debug_printf("create_optimized_selector_codebook\n"); const uint32_t total_selector_clusters = (uint32_t)m_selector_cluster_indices.size(); m_optimized_cluster_selectors.resize(total_selector_clusters); if ((m_params.m_pGlobal_sel_codebook) && (!m_params.m_use_hybrid_selector_codebooks)) { uint32_t total_clusters_processed = 0; m_optimized_cluster_selector_global_cb_ids.resize(total_selector_clusters); const uint32_t N = 256; for (uint32_t cluster_index_iter = 0; cluster_index_iter < total_selector_clusters; cluster_index_iter += N) { const uint32_t first_index = cluster_index_iter; const uint32_t last_index = minimum((uint32_t)total_selector_clusters, cluster_index_iter + N); m_params.m_pJob_pool->add_job( [this, first_index, last_index, &total_clusters_processed, &total_selector_clusters] { for (uint32_t cluster_index = first_index; cluster_index < last_index; cluster_index++) { const std::vector &cluster_block_indices = m_selector_cluster_indices[cluster_index]; if (!cluster_block_indices.size()) continue; etc_block_vec etc_blocks; pixel_block_vec pixel_blocks; for (uint32_t cluster_block_index = 0; cluster_block_index < cluster_block_indices.size(); cluster_block_index++) { const uint32_t block_index = cluster_block_indices[cluster_block_index]; etc_blocks.push_back(m_encoded_blocks[block_index]); pixel_blocks.push_back(get_source_pixel_block(block_index)); } uint32_t palette_index; basist::etc1_global_palette_entry_modifier palette_modifier; #if 0 m_params.m_pGlobal_sel_codebook->find_best_entry(etc_blocks.size(), pixel_blocks.get_ptr(), etc_blocks.get_ptr(), palette_index, palette_modifier, m_params.m_perceptual, 1 << m_params.m_num_global_sel_codebook_pal_bits, 1 << m_params.m_num_global_sel_codebook_mod_bits); #else etc1_global_selector_codebook_find_best_entry(*m_params.m_pGlobal_sel_codebook, (uint32_t)etc_blocks.size(), &pixel_blocks[0], &etc_blocks[0], palette_index, palette_modifier, m_params.m_perceptual, 1 << m_params.m_num_global_sel_codebook_pal_bits, 1 << m_params.m_num_global_sel_codebook_mod_bits); #endif m_optimized_cluster_selector_global_cb_ids[cluster_index].set(palette_index, palette_modifier); basist::etc1_selector_palette_entry pal_entry(m_params.m_pGlobal_sel_codebook->get_entry(palette_index, palette_modifier)); for (uint32_t y = 0; y < 4; y++) for (uint32_t x = 0; x < 4; x++) m_optimized_cluster_selectors[cluster_index].set_selector(x, y, pal_entry(x, y)); { std::lock_guard lock(m_lock); total_clusters_processed++; if ((total_clusters_processed % 63) == 0) debug_printf("Global selector palette optimization: %3.1f%% complete\n", total_clusters_processed * 100.0f / total_selector_clusters); } } // cluster_index } ); } // cluster_index_iter m_params.m_pJob_pool->wait_for_all(); } else { const bool uses_hybrid_sel_codebook = ((m_params.m_pGlobal_sel_codebook) && (m_params.m_use_hybrid_selector_codebooks)); if (uses_hybrid_sel_codebook) { m_selector_cluster_uses_global_cb.resize(total_selector_clusters); m_optimized_cluster_selector_global_cb_ids.resize(total_selector_clusters); } uint32_t total_clusters_processed = 0; // For each selector codebook entry, and for each of the 4x4 selectors, determine which selector minimizes the error across all the blocks that use that quantized selector. const uint32_t N = 256; for (uint32_t cluster_index_iter = 0; cluster_index_iter < total_selector_clusters; cluster_index_iter += N) { const uint32_t first_index = cluster_index_iter; const uint32_t last_index = minimum((uint32_t)total_selector_clusters, cluster_index_iter + N); m_params.m_pJob_pool->add_job( [this, first_index, last_index, &uses_hybrid_sel_codebook, &total_clusters_processed, &total_selector_clusters] { for (uint32_t cluster_index = first_index; cluster_index < last_index; cluster_index++) { const std::vector &cluster_block_indices = m_selector_cluster_indices[cluster_index]; if (!cluster_block_indices.size()) continue; uint64_t overall_best_err = 0; for (uint32_t y = 0; y < 4; y++) { for (uint32_t x = 0; x < 4; x++) { uint64_t best_err = UINT64_MAX; uint32_t best_s = 0; for (uint32_t s = 0; s < 4; s++) { uint32_t total_err = 0; for (uint32_t cluster_block_index = 0; cluster_block_index < cluster_block_indices.size(); cluster_block_index++) { const uint32_t block_index = cluster_block_indices[cluster_block_index]; const etc_block &blk = m_encoded_blocks[block_index]; const color_rgba &orig_color = get_source_pixel_block(block_index)(x, y); color_rgba block_color; blk.get_block_color(block_color, blk.get_subblock_index(x, y), s); total_err += color_distance(m_params.m_perceptual, block_color, orig_color, false); if (total_err > best_err) break; } // block_index if (total_err < best_err) { best_err = total_err; best_s = s; if (!best_err) break; } } // s m_optimized_cluster_selectors[cluster_index].set_selector(x, y, best_s); overall_best_err += best_err; } // x } // y if (uses_hybrid_sel_codebook) { etc_block_vec etc_blocks; pixel_block_vec pixel_blocks; for (uint32_t cluster_block_index = 0; cluster_block_index < cluster_block_indices.size(); cluster_block_index++) { const uint32_t block_index = cluster_block_indices[cluster_block_index]; etc_blocks.push_back(m_encoded_blocks[block_index]); pixel_blocks.push_back(get_source_pixel_block(block_index)); } uint32_t palette_index; basist::etc1_global_palette_entry_modifier palette_modifier; #if 0 uint64_t best_global_cb_err = m_params.m_pGlobal_sel_codebook->find_best_entry(etc_blocks.size(), pixel_blocks.get_ptr(), etc_blocks.get_ptr(), palette_index, palette_modifier, m_params.m_perceptual, 1 << m_params.m_num_global_sel_codebook_pal_bits, 1 << m_params.m_num_global_sel_codebook_mod_bits); #else uint64_t best_global_cb_err = etc1_global_selector_codebook_find_best_entry(*m_params.m_pGlobal_sel_codebook, (uint32_t)etc_blocks.size(), &pixel_blocks[0], &etc_blocks[0], palette_index, palette_modifier, m_params.m_perceptual, 1 << m_params.m_num_global_sel_codebook_pal_bits, 1 << m_params.m_num_global_sel_codebook_mod_bits); #endif if (best_global_cb_err <= overall_best_err * m_params.m_hybrid_codebook_quality_thresh) { m_selector_cluster_uses_global_cb[cluster_index] = true; m_optimized_cluster_selector_global_cb_ids[cluster_index].set(palette_index, palette_modifier); basist::etc1_selector_palette_entry pal_entry(m_params.m_pGlobal_sel_codebook->get_entry(palette_index, palette_modifier)); for (uint32_t y = 0; y < 4; y++) for (uint32_t x = 0; x < 4; x++) m_optimized_cluster_selectors[cluster_index].set_selector(x, y, pal_entry(x, y)); } else { m_optimized_cluster_selector_global_cb_ids[cluster_index].set(0, basist::etc1_global_palette_entry_modifier(0)); m_selector_cluster_uses_global_cb[cluster_index] = false; } } if (uses_hybrid_sel_codebook) { std::lock_guard lock(m_lock); total_clusters_processed++; if ((total_clusters_processed % 63) == 0) debug_printf("Global selector palette optimization: %3.1f%% complete\n", total_clusters_processed * 100.0f / total_selector_clusters); } } // cluster_index } ); } // cluster_index_iter m_params.m_pJob_pool->wait_for_all(); } // if (m_params.m_pGlobal_sel_codebook) if (m_params.m_debug_images) { uint32_t max_selector_cluster_size = 0; for (uint32_t i = 0; i < m_selector_cluster_indices.size(); i++) max_selector_cluster_size = maximum(max_selector_cluster_size, (uint32_t)m_selector_cluster_indices[i].size()); if ((max_selector_cluster_size * 5) < 32768) { const uint32_t x_spacer_len = 16; image selector_cluster_vis(x_spacer_len + max_selector_cluster_size * 5, (uint32_t)m_selector_cluster_indices.size() * 5); for (uint32_t selector_cluster_index = 0; selector_cluster_index < m_selector_cluster_indices.size(); selector_cluster_index++) { const std::vector &cluster_block_indices = m_selector_cluster_indices[selector_cluster_index]; for (uint32_t y = 0; y < 4; y++) for (uint32_t x = 0; x < 4; x++) selector_cluster_vis.set_clipped(x_spacer_len + x - 12, selector_cluster_index * 5 + y, color_rgba((m_optimized_cluster_selectors[selector_cluster_index].get_selector(x, y) * 255) / 3)); for (uint32_t i = 0; i < cluster_block_indices.size(); i++) { uint32_t block_index = cluster_block_indices[i]; const etc_block &blk = m_orig_encoded_blocks[block_index]; for (uint32_t y = 0; y < 4; y++) for (uint32_t x = 0; x < 4; x++) selector_cluster_vis.set_clipped(x_spacer_len + x + 5 * i, selector_cluster_index * 5 + y, color_rgba((blk.get_selector(x, y) * 255) / 3)); } } char buf[256]; snprintf(buf, sizeof(buf), "selector_cluster_vis_%u.png", iter); save_png(buf, selector_cluster_vis); } } } void basisu_frontend::find_optimal_selector_clusters_for_each_block() { debug_printf("find_optimal_selector_clusters_for_each_block\n"); m_block_selector_cluster_index.resize(m_total_blocks); if (m_params.m_compression_level == 0) { // Don't do anything, just leave the blocks in their original selector clusters. for (uint32_t i = 0; i < m_selector_cluster_indices.size(); i++) { for (uint32_t j = 0; j < m_selector_cluster_indices[i].size(); j++) m_block_selector_cluster_index[m_selector_cluster_indices[i][j]] = i; } } else { std::vector< std::vector > new_cluster_indices; // For each block: Determine which quantized selectors best encode that block, given its quantized endpoints. const uint32_t N = 1024; for (uint32_t block_index_iter = 0; block_index_iter < m_total_blocks; block_index_iter += N) { const uint32_t first_index = block_index_iter; const uint32_t last_index = minimum(m_total_blocks, first_index + N); m_params.m_pJob_pool->add_job( [this, first_index, last_index, &new_cluster_indices] { for (uint32_t block_index = first_index; block_index < last_index; block_index++) { const color_rgba* pBlock_pixels = get_source_pixel_block(block_index).get_ptr(); etc_block& blk = m_encoded_blocks[block_index]; color_rgba trial_block_colors[4]; blk.get_block_colors(trial_block_colors, 0); uint64_t best_cluster_err = UINT64_MAX; uint32_t best_cluster_index = 0; const uint32_t parent_selector_cluster = m_block_parent_selector_cluster.size() ? m_block_parent_selector_cluster[block_index] : 0; const uint_vec *pCluster_indices = m_selector_clusters_within_each_parent_cluster.size() ? &m_selector_clusters_within_each_parent_cluster[parent_selector_cluster] : nullptr; const uint32_t total_clusters = m_use_hierarchical_selector_codebooks ? (uint32_t)pCluster_indices->size() : (uint32_t)m_selector_cluster_indices.size(); for (uint32_t cluster_iter = 0; cluster_iter < total_clusters; cluster_iter++) { const uint32_t cluster_index = m_use_hierarchical_selector_codebooks ? (*pCluster_indices)[cluster_iter] : cluster_iter; const etc_block& cluster_blk = m_optimized_cluster_selectors[cluster_index]; uint64_t trial_err = 0; for (int y = 0; y < 4; y++) { for (int x = 0; x < 4; x++) { const uint32_t sel = cluster_blk.get_selector(x, y); trial_err += color_distance(m_params.m_perceptual, trial_block_colors[sel], pBlock_pixels[x + y * 4], false); if (trial_err > best_cluster_err) goto early_out; } } if (trial_err < best_cluster_err) { best_cluster_err = trial_err; best_cluster_index = cluster_index; if (!best_cluster_err) break; } early_out: ; } blk.set_raw_selector_bits(m_optimized_cluster_selectors[best_cluster_index].get_raw_selector_bits()); m_block_selector_cluster_index[block_index] = best_cluster_index; { std::lock_guard lock(m_lock); vector_ensure_element_is_valid(new_cluster_indices, best_cluster_index); new_cluster_indices[best_cluster_index].push_back(block_index); } } // block_index } ); } // block_index_iter m_params.m_pJob_pool->wait_for_all(); m_selector_cluster_indices.swap(new_cluster_indices); } for (uint32_t i = 0; i < m_selector_cluster_indices.size(); i++) vector_sort(m_selector_cluster_indices[i]); } // TODO: Remove old ETC1 specific stuff, and thread this. uint32_t basisu_frontend::refine_block_endpoints_given_selectors() { debug_printf("refine_block_endpoints_given_selectors\n"); for (int block_index = 0; block_index < static_cast(m_total_blocks); block_index++) { //uint32_t selector_cluster = m_block_selector_cluster_index(block_x, block_y); vec2U &endpoint_clusters = m_block_endpoint_clusters_indices[block_index]; m_endpoint_cluster_etc_params[endpoint_clusters[0]].m_subblocks.push_back(block_index * 2); m_endpoint_cluster_etc_params[endpoint_clusters[1]].m_subblocks.push_back(block_index * 2 + 1); } uint32_t total_subblocks_refined = 0; uint32_t total_subblocks_examined = 0; for (uint32_t endpoint_cluster_index = 0; endpoint_cluster_index < m_endpoint_cluster_etc_params.size(); endpoint_cluster_index++) { endpoint_cluster_etc_params &subblock_params = m_endpoint_cluster_etc_params[endpoint_cluster_index]; const uint_vec &subblocks = subblock_params.m_subblocks; //uint32_t total_pixels = subblock.m_subblocks.size() * 8; std::vector subblock_colors[2]; // [use_individual_mode] uint8_vec subblock_selectors[2]; uint64_t cur_subblock_err[2] = { 0, 0 }; for (uint32_t subblock_iter = 0; subblock_iter < subblocks.size(); subblock_iter++) { uint32_t training_vector_index = subblocks[subblock_iter]; uint32_t block_index = training_vector_index >> 1; uint32_t subblock_index = training_vector_index & 1; const bool is_flipped = true; const etc_block &blk = m_encoded_blocks[block_index]; const bool use_individual_mode = !blk.get_diff_bit(); const color_rgba *pSource_block_pixels = get_source_pixel_block(block_index).get_ptr(); color_rgba unpacked_block_pixels[16]; unpack_etc1(blk, unpacked_block_pixels); for (uint32_t i = 0; i < 8; i++) { const uint32_t pixel_index = g_etc1_pixel_indices[is_flipped][subblock_index][i]; const etc_coord2 &coords = g_etc1_pixel_coords[is_flipped][subblock_index][i]; subblock_colors[use_individual_mode].push_back(pSource_block_pixels[pixel_index]); cur_subblock_err[use_individual_mode] += color_distance(m_params.m_perceptual, pSource_block_pixels[pixel_index], unpacked_block_pixels[pixel_index], false); subblock_selectors[use_individual_mode].push_back(static_cast(blk.get_selector(coords.m_x, coords.m_y))); } } // subblock_iter etc1_optimizer::results cluster_optimizer_results[2]; bool results_valid[2] = { false, false }; clear_obj(cluster_optimizer_results); std::vector cluster_selectors[2]; for (uint32_t use_individual_mode = 0; use_individual_mode < 2; use_individual_mode++) { const uint32_t total_pixels = (uint32_t)subblock_colors[use_individual_mode].size(); if (!total_pixels) continue; total_subblocks_examined += total_pixels / 8; etc1_optimizer optimizer; etc1_solution_coordinates solutions[2]; etc1_optimizer::params cluster_optimizer_params; cluster_optimizer_params.m_num_src_pixels = total_pixels; cluster_optimizer_params.m_pSrc_pixels = &subblock_colors[use_individual_mode][0]; cluster_optimizer_params.m_use_color4 = use_individual_mode != 0; cluster_optimizer_params.m_perceptual = m_params.m_perceptual; cluster_optimizer_params.m_pForce_selectors = &subblock_selectors[use_individual_mode][0]; cluster_optimizer_params.m_quality = cETCQualityUber; cluster_selectors[use_individual_mode].resize(total_pixels); cluster_optimizer_results[use_individual_mode].m_n = total_pixels; cluster_optimizer_results[use_individual_mode].m_pSelectors = &cluster_selectors[use_individual_mode][0]; optimizer.init(cluster_optimizer_params, cluster_optimizer_results[use_individual_mode]); if (!optimizer.compute()) continue; if (cluster_optimizer_results[use_individual_mode].m_error < cur_subblock_err[use_individual_mode]) results_valid[use_individual_mode] = true; } // use_individual_mode for (uint32_t use_individual_mode = 0; use_individual_mode < 2; use_individual_mode++) { if (!results_valid[use_individual_mode]) continue; uint32_t num_passes = use_individual_mode ? 1 : 2; bool all_passed5 = true; for (uint32_t pass = 0; pass < num_passes; pass++) { for (uint32_t subblock_iter = 0; subblock_iter < subblocks.size(); subblock_iter++) { const uint32_t training_vector_index = subblocks[subblock_iter]; const uint32_t block_index = training_vector_index >> 1; const uint32_t subblock_index = training_vector_index & 1; const bool is_flipped = true; etc_block &blk = m_encoded_blocks[block_index]; if (!blk.get_diff_bit() != static_cast(use_individual_mode != 0)) continue; if (use_individual_mode) { blk.set_base4_color(subblock_index, etc_block::pack_color4(cluster_optimizer_results[1].m_block_color_unscaled, false)); blk.set_inten_table(subblock_index, cluster_optimizer_results[1].m_block_inten_table); subblock_params.m_color_error[1] = cluster_optimizer_results[1].m_error; subblock_params.m_inten_table[1] = cluster_optimizer_results[1].m_block_inten_table; subblock_params.m_color_unscaled[1] = cluster_optimizer_results[1].m_block_color_unscaled; total_subblocks_refined++; } else { const uint16_t base_color5 = blk.get_base5_color(); const uint16_t delta_color3 = blk.get_delta3_color(); uint32_t r[2], g[2], b[2]; etc_block::unpack_color5(r[0], g[0], b[0], base_color5, false); bool success = etc_block::unpack_color5(r[1], g[1], b[1], base_color5, delta_color3, false); assert(success); BASISU_NOTE_UNUSED(success); r[subblock_index] = cluster_optimizer_results[0].m_block_color_unscaled.r; g[subblock_index] = cluster_optimizer_results[0].m_block_color_unscaled.g; b[subblock_index] = cluster_optimizer_results[0].m_block_color_unscaled.b; color_rgba colors[2] = { color_rgba(r[0], g[0], b[0], 255), color_rgba(r[1], g[1], b[1], 255) }; if (!etc_block::try_pack_color5_delta3(colors)) { all_passed5 = false; break; } if ((pass == 1) && (all_passed5)) { blk.set_block_color5(colors[0], colors[1]); blk.set_inten_table(subblock_index, cluster_optimizer_results[0].m_block_inten_table); subblock_params.m_color_error[0] = cluster_optimizer_results[0].m_error; subblock_params.m_inten_table[0] = cluster_optimizer_results[0].m_block_inten_table; subblock_params.m_color_unscaled[0] = cluster_optimizer_results[0].m_block_color_unscaled; total_subblocks_refined++; } } } // subblock_iter } // pass } // use_individual_mode } // endpoint_cluster_index if (m_params.m_debug_stats) debug_printf("Total subblock endpoints refined: %u (%3.1f%%)\n", total_subblocks_refined, total_subblocks_refined * 100.0f / total_subblocks_examined); return total_subblocks_refined; } void basisu_frontend::dump_endpoint_clusterization_visualization(const char *pFilename, bool vis_endpoint_colors) { debug_printf("dump_endpoint_clusterization_visualization\n"); uint32_t max_endpoint_cluster_size = 0; std::vector cluster_sizes(m_endpoint_clusters.size()); std::vector sorted_cluster_indices(m_endpoint_clusters.size()); for (uint32_t i = 0; i < m_endpoint_clusters.size(); i++) { max_endpoint_cluster_size = maximum(max_endpoint_cluster_size, (uint32_t)m_endpoint_clusters[i].size()); cluster_sizes[i] = (uint32_t)m_endpoint_clusters[i].size(); } if (!max_endpoint_cluster_size) return; for (uint32_t i = 0; i < m_endpoint_clusters.size(); i++) sorted_cluster_indices[i] = i; //indexed_heap_sort(endpoint_clusters.size(), cluster_sizes.get_ptr(), sorted_cluster_indices.get_ptr()); image endpoint_cluster_vis(12 + minimum(max_endpoint_cluster_size, 2048) * 5, (uint32_t)m_endpoint_clusters.size() * 3); for (uint32_t unsorted_cluster_iter = 0; unsorted_cluster_iter < m_endpoint_clusters.size(); unsorted_cluster_iter++) { const uint32_t cluster_iter = sorted_cluster_indices[unsorted_cluster_iter]; etc_block blk; blk.clear(); blk.set_flip_bit(false); blk.set_diff_bit(true); blk.set_inten_tables_etc1s(m_endpoint_cluster_etc_params[cluster_iter].m_inten_table[0]); blk.set_base5_color(etc_block::pack_color5(m_endpoint_cluster_etc_params[cluster_iter].m_color_unscaled[0], false)); color_rgba blk_colors[4]; blk.get_block_colors(blk_colors, 0); for (uint32_t i = 0; i < 4; i++) endpoint_cluster_vis.fill_box(i * 2, 3 * unsorted_cluster_iter, 2, 2, blk_colors[i]); for (uint32_t subblock_iter = 0; subblock_iter < m_endpoint_clusters[cluster_iter].size(); subblock_iter++) { uint32_t training_vector_index = m_endpoint_clusters[cluster_iter][subblock_iter]; const uint32_t block_index = training_vector_index >> 1; const uint32_t subblock_index = training_vector_index & 1; const etc_block& blk2 = m_etc1_blocks_etc1s[block_index]; const color_rgba *pBlock_pixels = get_source_pixel_block(block_index).get_ptr(); color_rgba subblock_pixels[8]; if (vis_endpoint_colors) { color_rgba colors[2]; blk2.get_block_low_high_colors(colors, subblock_index); for (uint32_t i = 0; i < 8; i++) subblock_pixels[i] = colors[subblock_index]; } else { for (uint32_t i = 0; i < 8; i++) subblock_pixels[i] = pBlock_pixels[g_etc1_pixel_indices[blk2.get_flip_bit()][subblock_index][i]]; } endpoint_cluster_vis.set_block_clipped(subblock_pixels, 12 + 5 * subblock_iter, 3 * unsorted_cluster_iter, 4, 2); } } save_png(pFilename, endpoint_cluster_vis); debug_printf("Wrote debug visualization file %s\n", pFilename); } void basisu_frontend::finalize() { for (uint32_t block_index = 0; block_index < m_total_blocks; block_index++) { for (uint32_t subblock_index = 0; subblock_index < 2; subblock_index++) { const uint32_t endpoint_cluster_index = get_subblock_endpoint_cluster_index(block_index, subblock_index); m_endpoint_cluster_etc_params[endpoint_cluster_index].m_color_used[0] = true; } } } // The backend has remapped the block endpoints while optimizing the output symbols for better rate distortion performance, so let's go and reoptimize the endpoint codebook. // This is currently the only place where the backend actually goes and changes the quantization and calls the frontend to fix things up. // This is basically a bottom up clusterization stage, where some leaves can be combined. void basisu_frontend::reoptimize_remapped_endpoints(const uint_vec &new_block_endpoints, int_vec &old_to_new_endpoint_cluster_indices, bool optimize_final_codebook, uint_vec *pBlock_selector_indices) { debug_printf("reoptimize_remapped_endpoints\n"); std::vector new_endpoint_cluster_block_indices(m_endpoint_clusters.size()); for (uint32_t i = 0; i < new_block_endpoints.size(); i++) new_endpoint_cluster_block_indices[new_block_endpoints[i]].push_back(i); std::vector cluster_valid(new_endpoint_cluster_block_indices.size()); std::vector cluster_improved(new_endpoint_cluster_block_indices.size()); const uint32_t N = 256; for (uint32_t cluster_index_iter = 0; cluster_index_iter < new_endpoint_cluster_block_indices.size(); cluster_index_iter += N) { const uint32_t first_index = cluster_index_iter; const uint32_t last_index = minimum((uint32_t)new_endpoint_cluster_block_indices.size(), cluster_index_iter + N); m_params.m_pJob_pool->add_job( [this, first_index, last_index, &cluster_improved, &cluster_valid, &new_endpoint_cluster_block_indices, &pBlock_selector_indices ] { for (uint32_t cluster_index = first_index; cluster_index < last_index; cluster_index++) { const std::vector& cluster_block_indices = new_endpoint_cluster_block_indices[cluster_index]; if (!cluster_block_indices.size()) continue; const uint32_t total_pixels = (uint32_t)cluster_block_indices.size() * 16; std::vector cluster_pixels(total_pixels); uint8_vec force_selectors(total_pixels); etc_block blk; blk.set_block_color5_etc1s(get_endpoint_cluster_unscaled_color(cluster_index, false)); blk.set_inten_tables_etc1s(get_endpoint_cluster_inten_table(cluster_index, false)); blk.set_flip_bit(true); uint64_t cur_err = 0; for (uint32_t cluster_block_indices_iter = 0; cluster_block_indices_iter < cluster_block_indices.size(); cluster_block_indices_iter++) { const uint32_t block_index = cluster_block_indices[cluster_block_indices_iter]; const color_rgba *pBlock_pixels = get_source_pixel_block(block_index).get_ptr(); memcpy(&cluster_pixels[cluster_block_indices_iter * 16], pBlock_pixels, 16 * sizeof(color_rgba)); const uint32_t selector_cluster_index = pBlock_selector_indices ? (*pBlock_selector_indices)[block_index] : get_block_selector_cluster_index(block_index); const etc_block &blk_selectors = get_selector_cluster_selector_bits(selector_cluster_index); blk.set_raw_selector_bits(blk_selectors.get_raw_selector_bits()); cur_err += blk.evaluate_etc1_error(pBlock_pixels, m_params.m_perceptual); for (uint32_t y = 0; y < 4; y++) for (uint32_t x = 0; x < 4; x++) force_selectors[cluster_block_indices_iter * 16 + x + y * 4] = static_cast(blk_selectors.get_selector(x, y)); } endpoint_cluster_etc_params new_endpoint_cluster_etc_params; { etc1_optimizer optimizer; etc1_solution_coordinates solutions[2]; etc1_optimizer::params cluster_optimizer_params; cluster_optimizer_params.m_num_src_pixels = total_pixels; cluster_optimizer_params.m_pSrc_pixels = &cluster_pixels[0]; cluster_optimizer_params.m_use_color4 = false; cluster_optimizer_params.m_perceptual = m_params.m_perceptual; cluster_optimizer_params.m_pForce_selectors = &force_selectors[0]; if (m_params.m_compression_level == BASISU_MAX_COMPRESSION_LEVEL) cluster_optimizer_params.m_quality = cETCQualityUber; etc1_optimizer::results cluster_optimizer_results; std::vector cluster_selectors(total_pixels); cluster_optimizer_results.m_n = total_pixels; cluster_optimizer_results.m_pSelectors = &cluster_selectors[0]; optimizer.init(cluster_optimizer_params, cluster_optimizer_results); optimizer.compute(); new_endpoint_cluster_etc_params.m_color_unscaled[0] = cluster_optimizer_results.m_block_color_unscaled; new_endpoint_cluster_etc_params.m_inten_table[0] = cluster_optimizer_results.m_block_inten_table; new_endpoint_cluster_etc_params.m_color_error[0] = cluster_optimizer_results.m_error; new_endpoint_cluster_etc_params.m_color_used[0] = true; new_endpoint_cluster_etc_params.m_valid = true; } if (new_endpoint_cluster_etc_params.m_color_error[0] < cur_err) { m_endpoint_cluster_etc_params[cluster_index] = new_endpoint_cluster_etc_params; cluster_improved[cluster_index] = true; } cluster_valid[cluster_index] = true; } // cluster_index } ); } // cluster_index_iter m_params.m_pJob_pool->wait_for_all(); uint32_t total_unused_clusters = 0; uint32_t total_improved_clusters = 0; old_to_new_endpoint_cluster_indices.resize(m_endpoint_clusters.size()); vector_set_all(old_to_new_endpoint_cluster_indices, -1); int total_new_endpoint_clusters = 0; for (uint32_t old_cluster_index = 0; old_cluster_index < m_endpoint_clusters.size(); old_cluster_index++) { if (!cluster_valid[old_cluster_index]) total_unused_clusters++; else old_to_new_endpoint_cluster_indices[old_cluster_index] = total_new_endpoint_clusters++; if (cluster_improved[old_cluster_index]) total_improved_clusters++; } debug_printf("Total unused clusters: %u\n", total_unused_clusters); debug_printf("Total improved_clusters: %u\n", total_improved_clusters); debug_printf("Total endpoint clusters: %u\n", total_new_endpoint_clusters); if (optimize_final_codebook) { cluster_subblock_etc_params_vec new_endpoint_cluster_etc_params(total_new_endpoint_clusters); for (uint32_t old_cluster_index = 0; old_cluster_index < m_endpoint_clusters.size(); old_cluster_index++) { if (old_to_new_endpoint_cluster_indices[old_cluster_index] >= 0) new_endpoint_cluster_etc_params[old_to_new_endpoint_cluster_indices[old_cluster_index]] = m_endpoint_cluster_etc_params[old_cluster_index]; } debug_printf("basisu_frontend::reoptimize_remapped_endpoints: stage 1\n"); std::vector new_endpoint_clusters(total_new_endpoint_clusters); for (uint32_t block_index = 0; block_index < new_block_endpoints.size(); block_index++) { const uint32_t old_endpoint_cluster_index = new_block_endpoints[block_index]; const int new_endpoint_cluster_index = old_to_new_endpoint_cluster_indices[old_endpoint_cluster_index]; BASISU_FRONTEND_VERIFY(new_endpoint_cluster_index >= 0); BASISU_FRONTEND_VERIFY(new_endpoint_cluster_index < (int)new_endpoint_clusters.size()); new_endpoint_clusters[new_endpoint_cluster_index].push_back(block_index * 2 + 0); new_endpoint_clusters[new_endpoint_cluster_index].push_back(block_index * 2 + 1); BASISU_FRONTEND_VERIFY(new_endpoint_cluster_index < (int)new_endpoint_cluster_etc_params.size()); new_endpoint_cluster_etc_params[new_endpoint_cluster_index].m_subblocks.push_back(block_index * 2 + 0); new_endpoint_cluster_etc_params[new_endpoint_cluster_index].m_subblocks.push_back(block_index * 2 + 1); m_block_endpoint_clusters_indices[block_index][0] = new_endpoint_cluster_index; m_block_endpoint_clusters_indices[block_index][1] = new_endpoint_cluster_index; } debug_printf("basisu_frontend::reoptimize_remapped_endpoints: stage 2\n"); m_endpoint_clusters = new_endpoint_clusters; m_endpoint_cluster_etc_params = new_endpoint_cluster_etc_params; eliminate_redundant_or_empty_endpoint_clusters(); debug_printf("basisu_frontend::reoptimize_remapped_endpoints: stage 3\n"); for (uint32_t new_cluster_index = 0; new_cluster_index < m_endpoint_clusters.size(); new_cluster_index++) { for (uint32_t cluster_block_iter = 0; cluster_block_iter < m_endpoint_clusters[new_cluster_index].size(); cluster_block_iter++) { const uint32_t subblock_index = m_endpoint_clusters[new_cluster_index][cluster_block_iter]; const uint32_t block_index = subblock_index >> 1; m_block_endpoint_clusters_indices[block_index][0] = new_cluster_index; m_block_endpoint_clusters_indices[block_index][1] = new_cluster_index; const uint32_t old_cluster_index = new_block_endpoints[block_index]; old_to_new_endpoint_cluster_indices[old_cluster_index] = new_cluster_index; } } debug_printf("basisu_frontend::reoptimize_remapped_endpoints: stage 4\n"); for (uint32_t block_index = 0; block_index < m_encoded_blocks.size(); block_index++) { const uint32_t endpoint_cluster_index = get_subblock_endpoint_cluster_index(block_index, 0); m_encoded_blocks[block_index].set_block_color5_etc1s(get_endpoint_cluster_unscaled_color(endpoint_cluster_index, false)); m_encoded_blocks[block_index].set_inten_tables_etc1s(get_endpoint_cluster_inten_table(endpoint_cluster_index, false)); } debug_printf("Final (post-RDO) endpoint clusters: %u\n", m_endpoint_clusters.size()); } //debug_printf("validate_output: %u\n", validate_output()); } bool basisu_frontend::validate_output() const { debug_printf("validate_output\n"); if (!check_etc1s_constraints()) return false; for (uint32_t block_index = 0; block_index < m_total_blocks; block_index++) { //#define CHECK(x) do { if (!(x)) { DebugBreak(); return false; } } while(0) #define CHECK(x) BASISU_FRONTEND_VERIFY(x); CHECK(get_output_block(block_index).get_flip_bit() == true); const bool diff_flag = get_diff_flag(block_index); CHECK(diff_flag == true); etc_block blk; memset(&blk, 0, sizeof(blk)); blk.set_flip_bit(true); blk.set_diff_bit(true); const uint32_t endpoint_cluster0_index = get_subblock_endpoint_cluster_index(block_index, 0); const uint32_t endpoint_cluster1_index = get_subblock_endpoint_cluster_index(block_index, 1); // basisu only supports ETC1S, so these must be equal. CHECK(endpoint_cluster0_index == endpoint_cluster1_index); CHECK(blk.set_block_color5_check(get_endpoint_cluster_unscaled_color(endpoint_cluster0_index, false), get_endpoint_cluster_unscaled_color(endpoint_cluster1_index, false))); CHECK(get_endpoint_cluster_color_is_used(endpoint_cluster0_index, false)); blk.set_inten_table(0, get_endpoint_cluster_inten_table(endpoint_cluster0_index, false)); blk.set_inten_table(1, get_endpoint_cluster_inten_table(endpoint_cluster1_index, false)); const uint32_t selector_cluster_index = get_block_selector_cluster_index(block_index); CHECK(selector_cluster_index < get_total_selector_clusters()); CHECK(vector_find(get_selector_cluster_block_indices(selector_cluster_index), block_index) != -1); blk.set_raw_selector_bits(get_selector_cluster_selector_bits(selector_cluster_index).get_raw_selector_bits()); const etc_block &rdo_output_block = get_output_block(block_index); CHECK(rdo_output_block.get_flip_bit() == blk.get_flip_bit()); CHECK(rdo_output_block.get_diff_bit() == blk.get_diff_bit()); CHECK(rdo_output_block.get_inten_table(0) == blk.get_inten_table(0)); CHECK(rdo_output_block.get_inten_table(1) == blk.get_inten_table(1)); CHECK(rdo_output_block.get_base5_color() == blk.get_base5_color()); CHECK(rdo_output_block.get_delta3_color() == blk.get_delta3_color()); CHECK(rdo_output_block.get_raw_selector_bits() == blk.get_raw_selector_bits()); if (m_params.m_pGlobal_sel_codebook) { bool used_global_cb = true; if (m_params.m_use_hybrid_selector_codebooks) used_global_cb = m_selector_cluster_uses_global_cb[selector_cluster_index]; if (used_global_cb) { basist::etc1_global_selector_codebook_entry_id pal_id(get_selector_cluster_global_selector_entry_ids()[selector_cluster_index]); basist::etc1_selector_palette_entry pal_entry(m_params.m_pGlobal_sel_codebook->get_entry(pal_id)); for (uint32_t y = 0; y < 4; y++) { for (uint32_t x = 0; x < 4; x++) { CHECK(pal_entry(x, y) == blk.get_selector(x, y)); } } } } #undef CHECK } return true; } void basisu_frontend::dump_debug_image(const char *pFilename, uint32_t first_block, uint32_t num_blocks_x, uint32_t num_blocks_y, bool output_blocks) { gpu_image g; g.init(texture_format::cETC1, num_blocks_x * 4, num_blocks_y * 4); for (uint32_t y = 0; y < num_blocks_y; y++) { for (uint32_t x = 0; x < num_blocks_x; x++) { const uint32_t block_index = first_block + x + y * num_blocks_x; etc_block &blk = *(etc_block *)g.get_block_ptr(x, y); if (output_blocks) blk = get_output_block(block_index); else { const bool diff_flag = get_diff_flag(block_index); blk.set_diff_bit(diff_flag); blk.set_flip_bit(true); const uint32_t endpoint_cluster0_index = get_subblock_endpoint_cluster_index(block_index, 0); const uint32_t endpoint_cluster1_index = get_subblock_endpoint_cluster_index(block_index, 1); if (diff_flag) blk.set_block_color5(get_endpoint_cluster_unscaled_color(endpoint_cluster0_index, false), get_endpoint_cluster_unscaled_color(endpoint_cluster1_index, false)); else blk.set_block_color4(get_endpoint_cluster_unscaled_color(endpoint_cluster0_index, true), get_endpoint_cluster_unscaled_color(endpoint_cluster1_index, true)); blk.set_inten_table(0, get_endpoint_cluster_inten_table(endpoint_cluster0_index, !diff_flag)); blk.set_inten_table(1, get_endpoint_cluster_inten_table(endpoint_cluster1_index, !diff_flag)); const uint32_t selector_cluster_index = get_block_selector_cluster_index(block_index); blk.set_raw_selector_bits(get_selector_cluster_selector_bits(selector_cluster_index).get_raw_selector_bits()); } } } image img; g.unpack(img); save_png(pFilename, img); } } // namespace basisu