texture-compression-astc-sliced-3d

This extends ASTC texture compression to textures created with dimension: "3d". Each depth slice uses the existing two-dimensional ASTC block formats, so an application can sample a compressed volume directly through a 3D texture view.

It is useful for volumetric effects, baked lighting, and other volume assets where uncompressed storage is expensive. The block-size tradeoff applies within each slice: larger ASTC blocks reduce storage but lose detail. This feature does not expose ASTC’s separate volumetric block encodings or add HDR texture formats.

Request the sliced-3D feature only when the adapter exposes it. Its dependency is texture-compression-astc, which current WebGPU enables implicitly; explicitly requesting both supported tokens is also valid. Base ASTC support alone is insufficient for a 3D texture. Keep an uncompressed volume fallback, or use a 2D array and implement interpolation between slices in the shader.