66 lines
2.9 KiB
Markdown
66 lines
2.9 KiB
Markdown
---
|
||
title: PSO Precache机制笔记
|
||
date: 2025-02-08 20:42:16
|
||
excerpt:
|
||
tags:
|
||
rating: ⭐
|
||
---
|
||
# 前言
|
||
- 视频
|
||
- [Unreal Engine 5: Setup Precompiling Shaders (Bundled PSO's)](https://www.youtube.com/watch?v=NVoXDgXKS5k)
|
||
- [Unreal Engine 5: Show Number Of Compiling Shaders](https://www.youtube.com/watch?v=8h1k2ViADgU)
|
||
- 文章
|
||
- [UE5.3] PSO Cache&PreCache 源码阅读:https://zhuanlan.zhihu.com/p/679832250
|
||
- [UE5.3] PSO Cache&PreCache 源码阅读(二):https://zhuanlan.zhihu.com/p/681803986
|
||
- Unreal Engine 5.2 MeshPass拓展:https://zhuanlan.zhihu.com/p/671423486
|
||
- 优化UE5的PSO卡顿：FileCache，PreCache和异步PSO https://zhuanlan.zhihu.com/p/1898646962561094034
|
||
|
||
# BundledPSO
|
||
- 相关启动参数
|
||
- -logPSO
|
||
- -clearPSODriverCache
|
||
- 需要添加的配置
|
||
- RendererSettings
|
||
- r.ShaderPipelineCache.Enable=1
|
||
- DevOptions.Shaders
|
||
- NeedsSHaderStableKeys=true
|
||
- /Script/UnrealEd.ProjectPackagingSettings
|
||
- bShareMaterialShaderCode=True
|
||
- bSharedMaterialNativeLibraries=True
|
||
|
||
## 大致步骤
|
||
1. 可选：使用快捷方式 -clearPSODriverCache，清空PSO。
|
||
2. 添加上述配置。
|
||
3. 执行Launch打包并且启动项目。
|
||
4. 收集打包PSO：完成后可以在Saved/Metadata/PipelineCaches/找到打包的PSO文件，将其复制出来。
|
||
5. 收集RuntimePSO：运行打包后的项目，跑测后在Saved/CollectedPSOs可以找到Runtime PSO文件，将其复制出来。
|
||
6. 将所有收集的PSO放到一个制定的文件夹里，比如项目目录下PSOCollection，进行CommandLet`ShaderPipelineCacheTools`，之后会生成制定名称的spc文件。
|
||
7. 回到打包后的项目在指定平台的目录文件夹（在项目的Build文件夹下的Windows、Android）中新建文件夹PipelineCaches，并将spc文件放入。
|
||
8. 重新使用Launch打包，完成后可以在log中知道spc文件中 pso数量。
|
||
|
||
## 将收集的PSO打包进Pak中
|
||
```bash
|
||
Engine\Binaries\Win64\UnrealEditor-Cmd.exe -run=ShaderPipelineCacheTools expand #Run ShaderPipelineCacheTools with expand optionl
|
||
Project\PSOCollection\*.rec.upipelinecache #Use all .rec.upipelinecache files
|
||
Project\PSOCollection\*.shk #Use all .shk files
|
||
Project\PSOCollection\PSO_SKGZombies_PCD3D_SM6.spc # Output PSO to be bundled
|
||
|
||
cmd /k #保证CMD开启
|
||
```
|
||
|
||
```bash
|
||
"D:\UnrealEngine\UE_5.6\Engine\Binaries\Win64\UnrealEditor-Cmd.exe" -run=ShaderPipelineCacheTools expand "D:\Project\Demo\PSOCollection\*.rec.upipelinecache" "D:\Project\Demo\PSOCollection\*.shk" "D:\Project\Demo\PSOCollection\PSO_Demo_PCD3D_SM6.spc"
|
||
```
|
||
# 执行链
|
||
- FGraphEventArray UPrimitiveComponent::PrecachePSOs()
|
||
- void UMaterialInterface::InitDefaultMaterials()
|
||
- UMaterial::PrecachePSOs
|
||
|
||
UMaterial::PrecachePSOs => **MaterialResource->CollectPSOs()** => PrecacheMaterialPSOs() => PrecachePSOs() => CollectPSOs() => CollectPSOInitializers()
|
||
|
||
# CollectPSOInitializers()
|
||
接口IPSOCollector::CollectPSOInitializers()
|
||
|
||
## 其他MeshProcessor实现
|
||
|