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Support Barycentrics in Shaders #2900

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cwfitzgerald opened this issue Jul 20, 2022 · 1 comment
Open

Support Barycentrics in Shaders #2900

cwfitzgerald opened this issue Jul 20, 2022 · 1 comment
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area: api Issues related to API surface backend: dx12 Issues with DX12 or DXGI backend: metal Issues with Metal backend: vulkan Issues with Vulkan help required We need community help to make this happen. type: enhancement New feature or request

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@cwfitzgerald
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cwfitzgerald commented Jul 20, 2022 •
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Is your feature request related to a problem? Please describe.
Getting triangle barycentric coordiates is useful for various operations, including wireframes and visbuffer schinanigans.

Describe the solution you'd like

A @builtin(barycentric) vec3<f32> that is implemented on top of SV_Barycentrics in HLSL, [[barycentric_coord]] in msl 2.2+, and either VK_NV/KHR_fragment_shader_barycentric or VK_AMD_shader_explicit_vertex_parameter.

Depends on us having DXIL via #2722
@cwfitzgerald cwfitzgerald added type: enhancement New feature or request help required We need community help to make this happen. backend: dx12 Issues with DX12 or DXGI backend: metal Issues with Metal backend: vulkan Issues with Vulkan area: api Issues related to API surface labels Jul 20, 2022
@olivia-fl
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An equivalent to PerVertexKHR from VK_KHR_fragment_shader_barycentric would also be useful. Not sure if that should be a separate feature request.

@olivia-fl olivia-fl mentioned this issue Jan 28, 2025
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area: api Issues related to API surface backend: dx12 Issues with DX12 or DXGI backend: metal Issues with Metal backend: vulkan Issues with Vulkan help required We need community help to make this happen. type: enhancement New feature or request
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@olivia-fl @cwfitzgerald