Alpha-envelope shape exponent (>1 holds peak alpha longer).
Stamp blend mode. "add" brightens overlaps; "normal" composites
with premultiplied-alpha over.
Base color blended into particle rgb (hex 0xRRGGBB).
Mix amount between src color (0) and color (1).
Particle count. Hard-capped by the state texture size² (default 1M).
Total burst duration (sec); per-particle life is jittered.
Depth fog 0..1.
Morph rate on the 4th simplex axis (units per second).
Approximate swirl size in uv units (larger → bigger swirls).
Curl-noise + outward-bias drift speed (uv/sec, short-axis-
normalized) at full strength.
Radial outward push from element center, blended with curl.
Particle quad size in element px.
Life-taper curve exponent (>1 holds full speed longer).
Per-frame trail decay (0..1). 0 = stamp shows directly without
smear; higher values leave longer trails.
Global alpha multiplier on each particle (0..1).