Push constant of mat4x4<f32> fails to compile on DX12 #5683
Labels
api: dx12
Issues with DX12 or DXGI
area: correctness
We're behaving incorrectly
area: naga back-end
Outputs of naga shader conversion
lang: HLSL
D3D Shading Language
naga
Shader Translator
Description
Using a
var<push_constant>
of typemat4x4<f32>
fails to compile on DX12.Repro steps
Wgsl Shader:
Naga Hlsl Output:
Error:
ERROR [wgpu_core::device::global] Device::create_render_pipeline error: Internal error in ShaderStages(VERTEX) shader: FXC D3DCompile error (0x80004005): C:\Dev\undertone\ut-raster-pass::draw(13,16-24): error X3000: syntax error: unexpected token 'row_major' ?
Expected vs observed behavior
I would expect a mat4 to be fine as a push constant? Compiling the shader with just the
mat4x4<f32>
in the uniform buffer works fine. The above shader does compile fine onVULKAN
butDX12
crashes with the error formatted above.Platform
Windows 11, NVIDIA RTX 4060 8GB, DX12 backend
wgpu = { version = "0.19.3", default-features = false, features = ["wgsl", "metal", "dx12"] }
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