Mojo function
create_hilbert_lut
create_hilbert_lut(ctx: DeviceContext, grid_x: Int, grid_y: Int) -> DeviceBuffer[uint32]
Precompute Hilbert-curve block swizzle lookup-table for a rectangular grid.
The returned device pointer refers to a 1-D UInt32 array of length
grid_x * grid_y.
For linear (row-major) block id id, the packed value at lut[id]
encodes the swizzled coordinates: upper 16-bits = y, lower 16-bits = x.
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