// shared sizing constants for histogram and per-splat-mask GPU passes.
// keeping them in one place stops calc-histogram, select-by-range, intersect,
// and the histogram shaders from drifting independently.

// histogram tile reduction grid: tile shader writes a GRID_DIM x GRID_DIM
// texture, the reduce shader collapses it to 1x1. the histogram shaders
// hardcode MAX_GRID_DIM=64 as the unrolled loop bound; if GRID_DIM ever
// exceeds 64 the shader bound must be raised alongside it.
const GRID_DIM = 64;

// default bin count for histogram results when the caller does not override.
const NUM_BINS = 256;

// per-splat mask packing: each u32 of the output carries 4 splat bytes, so the
// mask is sized from the splat count alone and carries no dependency on the
// source texture's shape. all callers (Intersect, SelectByRange, ColorMatch)
// agree on layout by using this helper.
const maskByteSize = (count: number): number => {
    return Math.max(4, Math.ceil(count / 4) * 4);
};

export { GRID_DIM, NUM_BINS, maskByteSize };