Module shape 

Shape discriminant carried in the instance so one quad pipeline draws every SDF kind. Kept as a u32 (not a Rust enum) so it is GPU-uploadable verbatim and matches the SHAPE_* constants in sdf.wgsl.

Constants

CIRCLE

A filled, anti-aliased disc.

DIAMOND

A filled diamond (square rotated 45°).

RING

An annulus (filled ring with a hole) — inner is the hole radius.

SQUARE

A filled axis-aligned rounded square marker (inner = corner radius).

TRIANGLE

A filled upward equilateral-ish triangle marker.