selectActiveTargets static method

List<({int index, double weight})> selectActiveTargets(Float32List weights, { int cap = kMaxGpuMorphTargets, })

Picks the morph targets to evaluate on the GPU: the nonzero entries of weights with the largest magnitudes, at most cap of them, ordered by descending magnitude (ties keep the lower index first).

Implementation

static List<({int index, double weight})> selectActiveTargets(
  Float32List weights, {
  int cap = kMaxGpuMorphTargets,
}) {
  final active = <({int index, double weight})>[
    for (var i = 0; i < weights.length; i++)
      if (weights[i] != 0.0) (index: i, weight: weights[i]),
  ];
  active.sort((a, b) {
    final byMagnitude = b.weight.abs().compareTo(a.weight.abs());
    if (byMagnitude != 0) return byMagnitude;
    return a.index.compareTo(b.index);
  });
  return active.length > cap ? active.sublist(0, cap) : active;
}