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Support for mat / scalar #4817

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greggman opened this issue Aug 13, 2024 · 1 comment
Open

Support for mat / scalar #4817

greggman opened this issue Aug 13, 2024 · 1 comment
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wgsl WebGPU Shading Language Issues
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Milestone 3+

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@greggman
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WGSL doesn't currently support mat / scalar though it does support mat * scalar. Apparently this is because MSL and SPIR-V don't support it. GLSL, HLSL do. Is it trivial to transform the expression to mat * (1.0 / scalar)?

I ran into this porting GLSL shaders to WGSL.
@greggman greggman added the wgsl WebGPU Shading Language Issues label Aug 13, 2024
@kdashg
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kdashg commented Aug 27, 2024

WGSL 2024-08-27 Minutes
  • DN: Additionally for this, 1. Our sense is linear algebra has add and mul, but less so division. 2. Which division will it be: teh full precision / or the more approximate reciprocal. If we choose one then the other community will soon call for the other, which ends up being ugly.
  • JB: Kinda surprised you view division here as different enough conceptually. Might as well “scale down” as “scale up”.
  • DN: Fine to drop my point 1. Not worth arguing.
  • JP: Our sense is M3+; same with the clamp and shift issues above.
  • KG: We can pick M3+ here and change this or other around later as needed.

@kdashg kdashg added this to the Milestone 3+ milestone Aug 27, 2024
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@greggman @kdashg