Unreal Engine Issues and Bug Tracker (UE-55127)

Description

Behavior reproduced in 4.17.2 CL 3658906, 4.18.3 CL 3832480 and 4.19.P4 CL 3873914

To run the engine with DX12 I made a shortcut of the UE4Editor.exe found at D:\Epic Games\UE_4.18\Engine\Binaries\Win64 and added -DX12 to the target

Steps to Reproduce

Run engine with DX12
Create new Blank Project with No Starter Content
Create a new Material
In the Details panel of the material, navigate to the Tessellation section. In the D3D11 Tessellation Mode drop-down, select Flat Tessellation

Result: Editor Crash

Expected: Flat tessellation will be applied to material

Callstack

Fatal error: [File:D:\Build\++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Util.cpp] [Line: 242] (Device->*TPSOFunctionMap<TDesc>::GetCreatePipelineState())(Desc, IID_PPV_ARGS(&PSO)) failed at D:\Build\++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\D3D12RHI\Private\Windows\WindowsD3D12PipelineState.cpp:582 with error E_INVALIDARG

UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:414]
UE4Editor_D3D12RHI!D3D12RHI::VerifyD3D12Result() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\d3d12rhi\private\d3d12util.cpp:242]
UE4Editor_D3D12RHI!CreatePipelineState<D3D12_GRAPHICS_PIPELINE_STATE_DESC>() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\d3d12rhi\private\windows\windowsd3d12pipelinestate.cpp:582]
UE4Editor_D3D12RHI!FD3D12PipelineState::Create() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\d3d12rhi\private\windows\windowsd3d12pipelinestate.cpp:629]
UE4Editor_D3D12RHI!FD3D12PipelineStateCache::Add() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\d3d12rhi\private\windows\windowsd3d12pipelinestate.cpp:288]
UE4Editor_D3D12RHI!FD3D12PipelineStateCache::FindGraphicsLowLevel() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\d3d12rhi\private\windows\windowsd3d12pipelinestate.cpp:241]
UE4Editor_D3D12RHI!FD3D12PipelineStateCache::FindGraphics() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\d3d12rhi\private\windows\windowsd3d12pipelinestate.cpp:194]
UE4Editor_D3D12RHI!FD3D12DynamicRHI::RHICreateGraphicsPipelineState() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\d3d12rhi\private\d3d12state.cpp:336]
UE4Editor_RHI!RHICreateGraphicsPipelineState() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\rhi\public\dynamicrhi.h:929]
UE4Editor_RHI!GetAndOrCreateGraphicsPipelineState() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\rhi\private\pipelinestatecache.cpp:1044]
UE4Editor_RHI!SetGraphicsPipelineState() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\rhi\private\pipelinestatecache.cpp:177]
UE4Editor_Renderer!CommitGraphicsPipelineState<FDepthDrawingPolicy>() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\renderer\public\drawingpolicy.h:271]
UE4Editor_Renderer!FDepthDrawingPolicyFactory::DrawMesh() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\renderer\private\depthrendering.cpp:742]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderPrePassViewDynamic() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\renderer\private\depthrendering.cpp:849]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderPrePassView() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\renderer\private\depthrendering.cpp:986]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderPrePass() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\renderer\private\depthrendering.cpp:1300]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::Render() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:775]
UE4Editor_Renderer!RenderViewFamily_RenderThread() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\renderer\private\scenerendering.cpp:2081]
UE4Editor_Renderer!TGraphTask<`FRendererModule::BeginRenderingViewFamily'::`26'::EURCMacro_FDrawSceneCommand>::ExecuteTask() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\public\async\taskgraphinterfaces.h:784]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:651]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:560]
UE4Editor_RenderCore!RenderingThreadMain() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\rendercore\private\renderingthread.cpp:327]
UE4Editor_RenderCore!FRenderingThread::Run() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\rendercore\private\renderingthread.cpp:461]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:76]

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-55127 in the post.

1	Login to Vote

Fixed

Component	UE - Graphics Features
Affects Versions	4.17.2, 4.18.3, 4.19
Target Fix	4.21

Fix Commit	3892339
Main Commit	4042226
Release Commit	4399518

Created	Feb 13, 2018
Resolved	Feb 15, 2018
Updated	Oct 2, 2018

View Jira Issue

UE-55127

Flat Tessellation broken on DX12 renderer

Flat Tessellation broken on DX12 renderer

Have Comments or More Details?