atdunbg
5bdfb53566
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）。
116 lines
2.3 KiB
C++
116 lines
2.3 KiB
C++
// This file is part of gltfpack; see gltfpack.h for version/license details
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#include "gltfpack.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 <process.h>
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#else
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#include <unistd.h>
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#endif
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std::string getTempPrefix()
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{
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#if defined(_WIN32)
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const char* temp_dir = getenv("TEMP");
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std::string path = temp_dir ? temp_dir : ".";
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path += "\\gltfpack-temp";
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path += std::to_string(_getpid());
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return path;
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#elif defined(__wasi__)
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return "gltfpack-temp";
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#else
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std::string path = "/tmp/gltfpack-temp";
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path += std::to_string(getpid());
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return path;
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#endif
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}
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std::string getFullPath(const char* path, const char* base_path)
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{
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std::string result = base_path;
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std::string::size_type slash = result.find_last_of("/\\");
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result.erase(slash == std::string::npos ? 0 : slash + 1);
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result += path;
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return result;
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}
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std::string getFileName(const char* path)
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{
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std::string result = path;
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std::string::size_type slash = result.find_last_of("/\\");
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if (slash != std::string::npos)
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result.erase(0, slash + 1);
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std::string::size_type dot = result.find_last_of('.');
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if (dot != std::string::npos)
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result.erase(dot);
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return result;
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}
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std::string getExtension(const char* path)
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{
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std::string result = path;
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std::string::size_type slash = result.find_last_of("/\\");
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std::string::size_type dot = result.find_last_of('.');
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if (slash != std::string::npos && dot != std::string::npos && dot < slash)
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dot = std::string::npos;
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result.erase(0, dot);
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for (size_t i = 0; i < result.length(); ++i)
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if (unsigned(result[i] - 'A') < 26)
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result[i] = (result[i] - 'A') + 'a';
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return result;
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}
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bool readFile(const char* path, std::string& data)
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{
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FILE* file = fopen(path, "rb");
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if (!file)
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return false;
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fseek(file, 0, SEEK_END);
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long length = ftell(file);
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fseek(file, 0, SEEK_SET);
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if (length <= 0)
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{
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fclose(file);
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return false;
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}
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data.resize(length);
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size_t result = fread(&data[0], 1, data.size(), file);
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int rc = fclose(file);
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return rc == 0 && result == data.size();
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}
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bool writeFile(const char* path, const std::string& data)
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{
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FILE* file = fopen(path, "wb");
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if (!file)
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return false;
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size_t result = fwrite(&data[0], 1, data.size(), file);
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int rc = fclose(file);
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return rc == 0 && result == data.size();
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}
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void removeFile(const char* path)
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{
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remove(path);
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}
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