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Example usage in a shader: PLATFORM_ASSERT4(GroupThread > 4321, 0xDF7DC903, GroupThread, GroupIndex, GroupBase, asuint(123.456f)); Example GPU crash report output: LogD3D12RHI: Error: [GPUBreadCrumb] Last tracked GPU operations: LogD3D12RHI: Error: [GPUBreadCrumb] 3D Queue 0 - Begin: Frame 348 - Scene - ReflectionIndirect - RayTracingReflections - RayTracingDeferredReflectionsShade 957x466 LogD3D12RHI: Error: [GPUBreadCrumb] Shader assertion failed! ID: 0xDF7DC903 LogD3D12RHI: Error: [GPUBreadCrumb] Payload [int32]: 416 42 172032 1123477881 LogD3D12RHI: Error: [GPUBreadCrumb] Payload [uint32]: 416 42 172032 1123477881 LogD3D12RHI: Error: [GPUBreadCrumb] Payload [hex]: 0x000001A0 0x0000002A 0x0002A000 0x42F6E979 LogD3D12RHI: Error: [GPUBreadCrumb] Payload [float]: 0.000000 0.000000 0.000000 123.456001 This works through automatic diagnostic buffer binding in D3D12 RHI, which becomes available in *any* shader as a UAV. Opens the door for arbitrary human-readable message output from any shader in the future. PLATFORM_ASSERT macro is always enabled and available on supported platforms. It is intended to be a low-level mechanism for a higher-level check() that would be controlled via CVars. #rb Christopher.Waters [CL 16167404 by Yuriy ODonnell in ue5-main branch]