spawnGrains()

void mood_ring::FlowLayer::spawnGrains ( const RoomSense & s, float dtSec, int ringSize )

private

Definition at line 82 of file layers.cpp.

                                                                         {
    // Spawn rate is per second and scales with ring length, so the density
    // of sparkle is the same on a 60-LED ring and a 244-LED one.
    const float rate = kGrainsPerSecAtFull *
                       (static_cast<float>(ringSize) / 100.0f) * s.shimmer *
                       (0.5f + 0.5f * s.high);
    mSpawnBudget += rate * dtSec;
    while (mSpawnBudget >= 1.0f) {
        mSpawnBudget -= 1.0f;
        for (int g = 0; g < kMaxGrains; ++g) {
            if (mGrains[g].active)
                continue;
            mGrains[g].active = true;
            mGrains[g].ageSec = 0.0f;
            mGrains[g].index =
                static_cast<int>(mRng.unit() * static_cast<float>(ringSize));
            break;
        }
    }
    if (mSpawnBudget > 4.0f)
        mSpawnBudget = 4.0f; // no burst after a stall
}

References mood_ring::RoomSense::high, kMaxGrains, mGrains, mRng, mSpawnBudget, and mood_ring::RoomSense::shimmer.

Referenced by render().

Here is the caller graph for this function: