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）。
117 lines
2.0 KiB
C++
117 lines
2.0 KiB
C++
#ifndef __wasi__
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#error This file contains libc stubs for WASI SDK and should only be used in non-Emscripten WebAssembly builds
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#endif
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#include <assert.h>
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#include <stddef.h>
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#include <stdint.h>
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extern unsigned char __heap_base;
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static intptr_t sbrkp = intptr_t(&__heap_base);
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static const int WASM_PAGE_SIZE = 64 * 1024;
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extern "C" void* sbrk(intptr_t increment)
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{
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intptr_t sbrko = sbrkp;
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increment = (increment + 3) & ~3;
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sbrkp += increment;
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size_t heap_size = __builtin_wasm_memory_size(0) * WASM_PAGE_SIZE;
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if (size_t(sbrkp) > heap_size)
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{
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size_t diff = (sbrkp - heap_size + WASM_PAGE_SIZE - 1) / WASM_PAGE_SIZE;
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if (__builtin_wasm_memory_grow(0, diff) == size_t(-1))
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return (void*)-1;
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}
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return (void*)sbrko;
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}
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extern "C" void* memcpy(void* destination, const void* source, size_t num)
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{
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char* d = (char*)destination;
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const char* s = (const char*)source;
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if (((uintptr_t(d) | uintptr_t(s)) & 3) == 0)
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{
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while (num > 15)
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{
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((uint32_t*)d)[0] = ((uint32_t*)s)[0];
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((uint32_t*)d)[1] = ((uint32_t*)s)[1];
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((uint32_t*)d)[2] = ((uint32_t*)s)[2];
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((uint32_t*)d)[3] = ((uint32_t*)s)[3];
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d += 16;
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s += 16;
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num -= 16;
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}
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while (num > 3)
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{
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((uint32_t*)d)[0] = ((uint32_t*)s)[0];
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d += 4;
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s += 4;
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num -= 4;
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}
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}
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while (num > 0)
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{
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*d++ = *s++;
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num--;
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}
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return destination;
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}
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extern "C" void* memset(void* ptr, int value, size_t num)
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{
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uint32_t v32 = ~0u / 255 * uint8_t(value);
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char* d = (char*)ptr;
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if ((uintptr_t(d) & 3) == 0)
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{
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while (num > 15)
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{
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((uint32_t*)d)[0] = v32;
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((uint32_t*)d)[1] = v32;
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((uint32_t*)d)[2] = v32;
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((uint32_t*)d)[3] = v32;
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d += 16;
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num -= 16;
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}
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while (num > 3)
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{
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((uint32_t*)d)[0] = v32;
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d += 4;
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num -= 4;
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}
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}
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while (num > 0)
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{
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*d++ = char(value);
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num--;
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}
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return ptr;
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}
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void* operator new(size_t size)
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{
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return sbrk((size + 7) & ~7);
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}
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void operator delete(void* ptr) throw()
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{
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void* brk = reinterpret_cast<void*>(sbrkp);
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assert(ptr <= brk);
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sbrk((char*)ptr - (char*)brk);
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}
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