webgpu: speed up sample_texture_combos (#4690) * webgpu: speed up sample_texture_combos Render all texels in a single draw call using per-vertex point positioning instead of numAcross*2 setViewport+draw calls, and replace the O(N) select-chain sampling with an O(1) switch so each invocation samples only its own combo. Reduces runtime from ~13s to ~1s.
This is the conformance test suite for WebGPU. It tests the behaviors defined by the WebGPU specification.
The contents of this test suite are considered normative; implementations must pass them to be WebGPU-conformant. Mismatches between the specification and tests are bugs.
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