Shrink the default max binding index to 640 and expose it in Limits. #2957
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Following the corresponding changes happening in WebGPU.
Checklist
cargo clippy
.web-sys
updatedConnections
Description
The max binding index is reduced to 640 to avoid issues with wgpu's vulkan backend, for which binding indices map directly to the indices in vkCreateDescriptorSetLayout.
640 is the new default limit advertised by the spec, but technically non-vukan backends rename all of the bindings so they aren't affected by the same issue and can continue using 65535 (the previous limit) if requested.
This PR also exposes the limit in
Limits
.We don't have to merge this right away since the change has not made it into the WebGPU spec yet.
Testing
None