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add variable rasterization rate proposal#6271

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cabanier:VariableRasterizationRate
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add variable rasterization rate proposal#6271
cabanier wants to merge 1 commit into
gpuweb:mainfrom
cabanier:VariableRasterizationRate

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@cabanier
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Proposal for #450

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Previews, as seen when this build job started (90c2694):
WebGPU webgpu.idl | Explainer | Correspondence Reference
WGSL grammar.js | wgsl.lalr.txt

should treat it as an optional performance feature. User agents may clamp requested rates upward or
disable the feature in contexts where exposing it is not appropriate.

## Open Questions
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I'll add the proposal for discussion in the group. That said, right now it looks like VRS is fairly non-portable and potentially difficult to secure. We'll likely need a lot more work before it can make it in the spec.

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Do you have a suggestion on how we could add this? I'd like to avoid adding another WebXR-only API like we did for WebGL...

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@mwyrzykowski doesn't Apple jump through some hoops to get this feature to work? If we can't have a WebGPU extension, would you be ok with a WebXR only solution?

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