BlueRoseNote/03-UnrealEngine/Rendering/RenderingPipeline/PSO Precache机制笔记.md

---
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

# 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