[PaulHax]

Context

VolumeMapperLightAndShadow uses a linearly filtered texture for the head volume. On devices with texture-formats-tier1, vtk.js selects r16snorm for those scalars. WebGPU only permits an unfilterable float binding for that format. Example · Original format selection · WebGPU format table

The console error in the example without this fix in WebGPU mode

WebGPU uncaptured error: None of the supported sample types (UnfilterableFloat) of [Texture (unlabeled 64x64x93 px, TextureFormat::R16Snorm)] match the expected sample types (Float).
 - While validating entries[6] against { binding: 6, visibility: ShaderStage::(Vertex|Fragment), texture: {sampleType: TextureSampleType::Float, viewDimension: TextureViewDimension::e3D, multisampled: 0} }.
 - While validating [BindGroupDescriptor ""mapperBG""] against [BindGroupLayout (unlabeled)]
 - While calling [Device].CreateBindGroup([BindGroupDescriptor ""mapperBG""]).

Results

Signed and unsigned 16-bit image scalars can be sampled with a linear sampler. For values outside the exact integer range of half-float, the accuracy path can use four bytes per component when float32 filtering is available. Compact storage takes two bytes and can round values.

Changes

Use the existing float16/float32 selection for 16-bit image scalars on tier1 devices, including when updating an existing texture.

PR Checklist

• GitHub Actions CI passed: semantic-release commit messages, lint, and tests
• Test coverage added
• Documentation and TypeScript definitions are current for this internal change

[daker]

It would good if you can attach a before/after or a screenshot of the issue

[PaulHax]

It would good if you can attach a before/after or a screenshot of the issue

Before the vtk.js viewprot is just white in Chrome with WebGPU rendering. After, it shows the volume.

[daker]

LGTM

[github-actions]

🎉 This PR is included in version 38.0.8 🎉

The release is available on:

• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• GitHub release

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