private void Update_(int cyclesThisIteration)
{
while (cyclesThisIteration > 0)
{
var next_seq_ticks =
Apu.NextModulo_(this.syncTicks_, FRAME_SEQUENCER_TICKS);
if (next_seq_ticks == FRAME_SEQUENCER_TICKS)
{
this.frame_ = (byte)((this.frame_ + 1) % FRAME_SEQUENCER_COUNT);
var updateSweep = this.frame_ == 2 || this.frame_ == 6;
var updateLengths =
updateSweep || this.frame_ == 0 || this.frame_ == 4;
var updateEnvelopes = updateLengths || this.frame_ == 7;
if (updateSweep)
{
this.UpdateSweep_();
}
if (updateLengths)
{
this.UpdateLengths_();
}
if (updateEnvelopes)
{
this.UpdateEnvelopes_();
}
}
var ticks = Math.Min(next_seq_ticks, cyclesThisIteration);
this.UpdateChannels_(ticks / APU_TICKS);
cyclesThisIteration -= ticks;
}
}