feat: LOD 网格分级——meshopt 解析期简化 + 按距离/级联选级
vendored meshoptimizer 1.2（submodule 环境故障改直接 vendor）。Mesh 多 LOD：各级索引连续拼进同一 index buffer（共享顶点，LodRange 区间 选择），解析期 meshopt_simplify 生成链（LOD0=原始，每级目标减半， 相对误差 1e-2，小网格复用上级）；都在 worker 线程，加载零额外卡顿。 SceneRenderer 按 (mesh, LOD) 聚合 batch（lookup key = 指针<<8|lod）： 主视图按屏占比近似 radius/dist 选级（阈值 10/20 倍半径）；阴影级联 按级联序降级（越远越简）。Draw 按 batch.lod 选索引区间。 A/B 对比（100 背包 10×10，RTX 5060 Laptop，vsync off）： - 纯背包：LOD 开 93-95 fps / 关 90-107 fps —— 无显著差异 - 加 SunTemple：LOD 开 52-56 / 关 51-55 —— 无显著差异 结论：当前场景瓶颈不在顶点数（5060 顶点吞吐富余），LOD 基础设施 保留（几何复杂资产/低端 GPU/更大场景生效），帧率问题转向 Tracy GPU 时间线定位真实瓶颈。 坑：LodRange 记录"LOD 不足复用最后一级"时 first 不得继续累加 （buffer 无重复数据，累加必越界——VUID-08798 抓的）。
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// This file is part of gltfpack; see gltfpack.h for version/license details
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#ifdef WITH_BASISU
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#include "gltfpack.h"
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#define BASISU_NO_ITERATOR_DEBUG_LEVEL
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#ifdef __clang__
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#pragma GCC diagnostic ignored "-Wunknown-warning-option"
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#pragma GCC diagnostic ignored "-Warray-bounds"
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#pragma GCC diagnostic ignored "-Wc++17-extensions"
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#pragma GCC diagnostic ignored "-Wdeprecated-builtins"
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#endif
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#ifdef __GNUC__
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#pragma GCC diagnostic ignored "-Wclass-memaccess"
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#pragma GCC diagnostic ignored "-Wshadow"
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#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
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#pragma GCC diagnostic ignored "-Wunused-value"
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#endif
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#if defined(__GNUC__) && __GNUC__ >= 12
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#pragma GCC diagnostic ignored "-Wc++17-extensions"
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#endif
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#include "encoder/basisu_comp.h"
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struct BasisSettings
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{
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int etc1s_l;
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int etc1s_q;
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int uastc_l;
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float uastc_q;
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};
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static const BasisSettings kBasisSettings[10] = {
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{1, 1, 0, 4.f},
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{1, 32, 0, 3.f},
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{1, 64, 1, 2.f},
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{1, 96, 1, 1.5f},
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{1, 128, 1, 1.f}, // quality arguments aligned with basisu defaults
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{1, 150, 1, 0.8f},
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{1, 170, 1, 0.6f},
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{1, 192, 1, 0.4f}, // gltfpack defaults
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{1, 224, 2, 0.2f},
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{1, 255, 2, 0.f},
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};
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static void fillParams(basisu::basis_compressor_params& params, const char* input, const char* output, bool uastc, int width, int height, const BasisSettings& bs, const ImageInfo& info, const Settings& settings)
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{
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if (uastc)
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{
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static const uint32_t s_level_flags[basisu::TOTAL_PACK_UASTC_LEVELS] = {basisu::cPackUASTCLevelFastest, basisu::cPackUASTCLevelFaster, basisu::cPackUASTCLevelDefault, basisu::cPackUASTCLevelSlower, basisu::cPackUASTCLevelVerySlow};
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params.m_uastc = true;
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#if BASISU_LIB_VERSION >= 160
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params.m_pack_uastc_ldr_4x4_flags &= ~basisu::cPackUASTCLevelMask;
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params.m_pack_uastc_ldr_4x4_flags |= s_level_flags[bs.uastc_l];
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params.m_rdo_uastc_ldr_4x4 = bs.uastc_q > 0;
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params.m_rdo_uastc_ldr_4x4_quality_scalar = bs.uastc_q;
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params.m_rdo_uastc_ldr_4x4_dict_size = 1024;
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#else
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params.m_pack_uastc_flags &= ~basisu::cPackUASTCLevelMask;
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params.m_pack_uastc_flags |= s_level_flags[bs.uastc_l];
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params.m_rdo_uastc = bs.uastc_q > 0;
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params.m_rdo_uastc_quality_scalar = bs.uastc_q;
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params.m_rdo_uastc_dict_size = 1024;
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#endif
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}
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else
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{
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#if BASISU_LIB_VERSION >= 200
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params.m_etc1s_compression_level = bs.etc1s_l;
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params.m_quality_level = bs.etc1s_q;
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params.m_etc1s_max_endpoint_clusters = 0;
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params.m_etc1s_max_selector_clusters = 0;
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#elif BASISU_LIB_VERSION >= 160
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params.m_compression_level = bs.etc1s_l;
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params.m_etc1s_quality_level = bs.etc1s_q;
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params.m_etc1s_max_endpoint_clusters = 0;
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params.m_etc1s_max_selector_clusters = 0;
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#else
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params.m_compression_level = bs.etc1s_l;
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params.m_quality_level = bs.etc1s_q;
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params.m_max_endpoint_clusters = 0;
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params.m_max_selector_clusters = 0;
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#endif
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params.m_no_selector_rdo = info.normal_map;
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params.m_no_endpoint_rdo = info.normal_map;
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}
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params.m_perceptual = info.srgb;
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params.m_mip_gen = true;
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params.m_mip_srgb = info.srgb;
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params.m_resample_width = width;
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params.m_resample_height = height;
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params.m_y_flip = settings.texture_flipy;
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params.m_create_ktx2_file = true;
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#if BASISU_LIB_VERSION >= 200
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params.m_ktx2_and_basis_srgb_transfer_function = info.srgb;
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#else
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params.m_ktx2_srgb_transfer_func = info.srgb;
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#endif
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if (uastc)
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{
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params.m_ktx2_uastc_supercompression = basist::KTX2_SS_ZSTANDARD;
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params.m_ktx2_zstd_supercompression_level = 9;
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}
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params.m_read_source_images = true;
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#if BASISU_LIB_VERSION >= 150
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params.m_write_output_basis_or_ktx2_files = true;
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#else
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params.m_write_output_basis_files = true;
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#endif
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params.m_source_filenames.resize(1);
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params.m_source_filenames[0] = input;
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params.m_out_filename = output;
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params.m_status_output = false;
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}
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static const char* prepareEncode(basisu::basis_compressor_params& params, const cgltf_image& image, const char* input_path, const ImageInfo& info, const Settings& settings, const std::string& temp_prefix, std::string& temp_input, std::string& temp_output)
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{
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std::string img_data;
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std::string mime_type;
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if (!readImage(image, input_path, img_data, mime_type))
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return "error reading source file";
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if (mime_type != "image/png" && mime_type != "image/jpeg")
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return NULL;
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int width = 0, height = 0;
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if (!getDimensions(img_data, mime_type.c_str(), width, height))
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return "error parsing image header";
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adjustDimensions(width, height, settings.texture_scale[info.kind], settings.texture_limit[info.kind], settings.texture_pow2);
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temp_input = temp_prefix + mimeExtension(mime_type.c_str());
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temp_output = temp_prefix + ".ktx2";
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if (!writeFile(temp_input.c_str(), img_data))
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return "error writing temporary file";
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int quality = settings.texture_quality[info.kind];
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bool uastc = settings.texture_mode[info.kind] == TextureMode_UASTC;
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const BasisSettings& bs = kBasisSettings[quality - 1];
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fillParams(params, temp_input.c_str(), temp_output.c_str(), uastc, width, height, bs, info, settings);
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return NULL;
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}
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void encodeImagesBasis(std::string* encoded, const cgltf_data* data, const std::vector<ImageInfo>& images, const char* input_path, const Settings& settings)
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{
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basisu::basisu_encoder_init();
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basisu::vector<basisu::basis_compressor_params> params(data->images_count);
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basisu::vector<basisu::parallel_results> results(data->images_count);
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std::string temp_prefix = getTempPrefix();
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std::vector<std::string> temp_inputs(data->images_count);
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std::vector<std::string> temp_outputs(data->images_count);
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for (size_t i = 0; i < data->images_count; ++i)
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{
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const cgltf_image& image = data->images[i];
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ImageInfo info = images[i];
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if (settings.texture_mode[info.kind] == TextureMode_ETC1S || settings.texture_mode[info.kind] == TextureMode_UASTC)
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if (const char* error = prepareEncode(params[i], image, input_path, info, settings, temp_prefix + "-" + std::to_string(i), temp_inputs[i], temp_outputs[i]))
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encoded[i] = error;
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}
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uint32_t num_threads = settings.texture_jobs == 0 ? std::thread::hardware_concurrency() : settings.texture_jobs;
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basisu::basis_parallel_compress(num_threads, params, results);
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for (size_t i = 0; i < data->images_count; ++i)
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{
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if (params[i].m_source_filenames.empty())
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; // encoding was skipped or preparation resulted in an error
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else if (results[i].m_error_code == basisu::basis_compressor::cECFailedReadingSourceImages)
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encoded[i] = "error decoding source image";
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else if (results[i].m_error_code != basisu::basis_compressor::cECSuccess)
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encoded[i] = "error encoding image";
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else if (!readFile(temp_outputs[i].c_str(), encoded[i]))
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encoded[i] = "error reading temporary file";
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}
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for (size_t i = 0; i < data->images_count; ++i)
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{
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if (!temp_inputs[i].empty())
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removeFile(temp_inputs[i].c_str());
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if (!temp_outputs[i].empty())
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removeFile(temp_outputs[i].c_str());
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}
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}
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#endif
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