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

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title	date	excerpt	tags	rating
PSO Precache机制笔记	2025-02-08 20:42:16			⭐

前言

• 视频
  • Unreal Engine 5: Setup Precompiling Shaders (Bundled PSO's)
  • Unreal Engine 5: Show Number Of Compiling Shaders
• 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。

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