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UE4在DX12 RHI上崩溃两例记录

 3 years ago
source link: https://blog.ch-wind.com/ue4-crash-log-on-direct12-rhi/
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主要是发生在global shader的自定义上，如果你没有使用的话估计原因不太一样~

当前使用UE版本为UE4.25.1。

原本在理解上感觉UE4的RHI封装应当是一致的，但实际情况还是会有些不同。

结论上看，在Direct12的RHI上有一些更加严格的限制，如果不注意的话就会出现问题。

参数顺序

Dx12的RHI要求Vertex Shader和Pixel Shader的参数顺序是一致的，也就是说OutPut的次序就是Input的次序，否则就会出现以下错误

Fatal error: [File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/D3D12RHI/Private/D3D12Util.cpp] [Line: 581] hr failed at D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/D3D12RHI/Private/Windows/WindowsD3D12PipelineState.cpp:697 with error E_INVALIDARG
UE4Editor.exe has triggered a breakpoint.

调整参数次序后不再出现。

SetGraphicsPipelineState

这个错误应当与初始化次序有关，主要是Vertex Shader等的参数必须在SetGraphicsPipelineState之后调用，否则就会出现一下错误

Ensure condition failed: CachedShader == VertexShader [File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/D3D12RHI/Private/D3D12Commands.cpp] [Line: 38] Parameters are being set for a VertexShader which is not currently bound
UE4Editor.exe has triggered a breakpoint.

注意调整下次序就可以了，类似这样的[ 改动 ]就可以了。


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