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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#include "../src/meshoptimizer.h"
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#include <vector>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef _WIN32
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#include <fcntl.h>
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#include <io.h>
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#endif
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size_t measure(const char* cmd, const std::vector<unsigned char>& data)
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{
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FILE* file = fopen("/tmp/codectest.in", "wb");
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if (!file)
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return 0;
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fwrite(data.data(), data.size(), 1, file);
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fclose(file);
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char actualcmd[1024];
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snprintf(actualcmd, sizeof(actualcmd), cmd, "/tmp/codectest.in", "/tmp/codectest.out");
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int rc = system(actualcmd);
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if (rc)
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return 0;
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file = fopen("/tmp/codectest.out", "rb");
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if (!file)
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return 0;
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fseek(file, 0, SEEK_END);
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long result = ftell(file);
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fclose(file);
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return result;
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}
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size_t measure_lz4(const std::vector<unsigned char>& data)
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{
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return measure("lz4 -f -q %s %s", data);
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}
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size_t measure_zstd(const std::vector<unsigned char>& data)
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{
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return measure("zstd -f -q %s -o %s", data);
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}
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struct Stats
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{
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bool testz;
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double count;
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double size;
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double ratio;
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double ratio_lz4;
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double ratio_zstd;
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double total;
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double total_lz4;
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double total_zstd;
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};
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void testFile(FILE* file, size_t count, size_t stride, int level, Stats* stats = 0)
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{
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std::vector<unsigned char> input;
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unsigned char buffer[4096];
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size_t bytes_read;
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while ((bytes_read = fread(buffer, 1, sizeof(buffer), file)) > 0)
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input.insert(input.end(), buffer, buffer + bytes_read);
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std::vector<unsigned char> decoded(count * stride);
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int res = meshopt_decodeVertexBuffer(&decoded[0], count, stride, &input[0], input.size());
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if (res != 0 && input.size() == decoded.size())
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{
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// some files are not encoded
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memcpy(decoded.data(), input.data(), decoded.size());
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}
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else if (res != 0)
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{
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printf(" error decoding input: %d", res);
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return;
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}
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std::vector<unsigned char> output(meshopt_encodeVertexBufferBound(count, stride));
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output.resize(meshopt_encodeVertexBufferLevel(output.data(), output.size(), decoded.data(), count, stride, level, -1));
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printf(" raw %zu KB\t", decoded.size() / 1024);
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printf(" vtx %.3f", double(output.size()) / double(decoded.size()));
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if (stats)
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{
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stats->count++;
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stats->size += double(decoded.size());
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stats->total += double(output.size());
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stats->ratio += log(double(output.size()) / double(decoded.size()));
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}
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if (stats && stats->testz)
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{
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size_t decoded_lz4 = measure_lz4(decoded);
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size_t output_lz4 = measure_lz4(output);
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size_t decoded_zstd = measure_zstd(decoded);
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size_t output_zstd = measure_zstd(output);
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stats->total_lz4 += output_lz4;
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stats->total_zstd += output_zstd;
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stats->ratio_lz4 += log(double(output_lz4) / double(decoded.size()));
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stats->ratio_zstd += log(double(output_zstd) / double(decoded.size()));
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printf("\tlz4 %.3f", double(decoded_lz4) / double(decoded.size()));
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printf(" vtx+lz4 %.3f", double(output_lz4) / double(decoded.size()));
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printf("\tzstd %.3f", double(decoded_zstd) / double(decoded.size()));
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printf(" vtx+zstd %.3f", double(output_zstd) / double(decoded.size()));
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}
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}
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void testFile(const char* path, int level, Stats* stats = 0)
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{
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FILE* file = fopen(path, "rb");
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if (!file)
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return;
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const char* name = strrchr(path, '/');
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name = name ? name + 1 : path;
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int vcnt, vsz;
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int sr = sscanf(name, "v%d_s%d_", &vcnt, &vsz);
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assert(sr == 2);
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(void)sr;
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const char* name0 = strchr(strchr(name, '_') + 1, '_') + 1;
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const char* name1 = strstr(name0, "_R");
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size_t namel = name1 ? name1 - name0 : strlen(name0);
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namel = namel > 25 ? 25 : namel;
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#if TRACE
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printf("%.*s: %s\n", int(namel), name0, path);
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#else
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printf("%25.*s:", int(namel), name0);
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#endif
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testFile(file, vcnt, vsz, level, stats);
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printf("\n");
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fclose(file);
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}
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int main(int argc, char** argv)
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{
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#ifdef _WIN32
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_setmode(_fileno(stdin), _O_BINARY);
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_setmode(_fileno(stdout), _O_BINARY);
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#endif
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if (argc > 1 && (strcmp(argv[1], "-test") == 0 || strcmp(argv[1], "-testz") == 0))
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{
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Stats stats = {};
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stats.testz = strcmp(argv[1], "-testz") == 0;
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int level = -1;
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if (argc > 2 && argv[2][0] == '-' && argv[2][1] >= '0' && argv[2][1] <= '9')
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level = atoi(argv[2] + 1);
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for (int i = level < 0 ? 2 : 3; i < argc; ++i)
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testFile(argv[i], level < 0 ? 2 : level, &stats);
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printf("---\n");
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printf("%d files: vtx %.3f", int(stats.count), exp(stats.ratio / stats.count));
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if (stats.testz)
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printf(", vtx+lz4 %.3f, vtx+zstd %.3f\n", exp(stats.ratio_lz4 / stats.count), exp(stats.ratio_zstd / stats.count));
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else
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printf("\n");
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printf("total: %d files, raw %.2f MB, vtx %.2f MB",
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int(stats.count),
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stats.size / 1024 / 1024, stats.total / 1024 / 1024);
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if (stats.testz)
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printf(", vtx+lz4 %.2f MB, vtx+zstd %.2f MB\n", stats.total_lz4 / 1024 / 1024, stats.total_zstd / 1024 / 1024);
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else
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printf("\n");
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return 0;
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}
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if (argc < 2 || argc > 3 || atoi(argv[1]) <= 0)
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{
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fprintf(stderr, "Usage: %s <stride> [<count>]\n", argv[0]);
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return 1;
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}
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size_t stride = atoi(argv[1]);
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std::vector<unsigned char> input;
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unsigned char buffer[4096];
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size_t bytes_read;
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while ((bytes_read = fread(buffer, 1, sizeof(buffer), stdin)) > 0)
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input.insert(input.end(), buffer, buffer + bytes_read);
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if (argc == 3)
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{
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// if count is specified, we assume input is meshopt-encoded and decode it first
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size_t count = atoi(argv[2]);
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std::vector<unsigned char> decoded(count * stride);
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int res = meshopt_decodeVertexBuffer(&decoded[0], count, stride, &input[0], input.size());
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if (res != 0)
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{
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fprintf(stderr, "Error decoding input: %d\n", res);
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return 2;
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}
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fwrite(decoded.data(), 1, decoded.size(), stdout);
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return 0;
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}
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else
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{
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size_t vertex_count = input.size() / stride;
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std::vector<unsigned char> output(meshopt_encodeVertexBufferBound(vertex_count, stride));
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size_t output_size = meshopt_encodeVertexBuffer(output.data(), output.size(), input.data(), vertex_count, stride);
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#if TRACE
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printf("%d => %d\n", int(input.size()), int(output_size));
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#else
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fwrite(output.data(), 1, output_size, stdout);
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#endif
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return 0;
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}
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}
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