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）。
93 lines
1.6 KiB
C++
93 lines
1.6 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 <float.h>
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#include <math.h>
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#include <stdio.h>
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void comma(std::string& s)
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{
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char ch = s.empty() ? 0 : s[s.size() - 1];
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if (ch != 0 && ch != '[' && ch != '{')
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s += ",";
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}
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void append(std::string& s, size_t v)
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{
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char buf[32];
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snprintf(buf, sizeof(buf), "%zu", v);
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s += buf;
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}
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void append(std::string& s, float v)
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{
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// sanitize +-inf to +-FLT_MAX and NaN to FLT_MAX
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// it would be more consistent to use null for NaN but that makes JSON invalid, and 0 makes it hard to distinguish from valid values
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float sv = fabsf(v) < FLT_MAX ? v : (v < 0 ? -FLT_MAX : FLT_MAX);
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char buf[64];
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snprintf(buf, sizeof(buf), "%.9g", sv);
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s += buf;
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}
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void append(std::string& s, const char* v)
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{
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s += v;
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}
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void append(std::string& s, const std::string& v)
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{
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s += v;
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}
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void append(std::string& s, const float* data, size_t count)
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{
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s += '[';
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for (size_t i = 0; i < count; ++i)
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{
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if (i != 0)
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s += ',';
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append(s, data[i]);
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}
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s += ']';
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}
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void appendJson(std::string& s, const char* data)
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{
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enum State
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{
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None,
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Escape,
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Quoted
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} state = None;
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for (const char* it = data; *it; ++it)
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{
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char ch = *it;
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// whitespace outside of quoted strings can be ignored
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if (state != None || !isspace(ch))
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s += ch;
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// the finite automata tracks whether we're inside a quoted string
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switch (state)
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{
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case None:
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state = (ch == '"') ? Quoted : None;
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break;
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case Quoted:
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state = (ch == '"') ? None : (ch == '\\' ? Escape : Quoted);
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break;
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case Escape:
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state = Quoted;
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break;
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default:
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assert(!"Unexpected parsing state");
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}
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}
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}
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