Expand description
Backend-agnostic helpers for the transparent (translucent) pass. The pass itself is encoded per backend; this module owns only the CPU-side ordering policy so it can be unit-tested without a GPU and reused as the Vulkan / DirectX transparent ports land.
Transparent fragments use SRC_ALPHA / ONE_MINUS_SRC_ALPHA blending, which is
order-dependent: a draw must be composited after everything behind it.
back_to_front_order returns the draw indices sorted farthest-first by
camera distance so the blend resolves correctly. This is a single fixed
sorted draw list, not order-independent transparency.
Functionsยง
- back_
to_ front_ order - Return the indices
0..distances.len()ordered farthest camera distance first (back-to-front). The sort is stable, so draws at equal distance keep their original (declaration) order. Non-finite distances (NaN) are treated as nearest so a degenerate value never pushes a draw behind valid geometry.