Readonlytexture: GPUTexturer32float, dimension '3d', with STORAGE_BINDING, at least the grid's size (createSdfTexture).
Readonlybuffer: GPUBufferSTORAGE, at least 4 * x * y * z bytes past offset: voxel (x, y, z) at float (z * ny + y) * nx + x.
Optional Readonlyoffset?: numberBytes; a multiple of the device's minStorageBufferOffsetAlignment. Default 0.
Where SdfGenerator.encode writes.