private void UpdateSquareWave_(Channel channel, int total_frames)
{
if (channel.status)
{
var square = channel.square_wave;
while (total_frames > 0)
{
int frames = (int)(square.ticks / APU_TICKS);
byte sample = Apu.CHANNELX_SAMPLE(channel, square.sample);
if (frames <= total_frames)
{
square.ticks = square.period;
square.position = (byte)((square.position + 1) % DUTY_CYCLE_COUNT);
square.sample = Apu.GetDuty(square.duty, square.position);
}
else
{
frames = total_frames;
square.ticks -= (uint)frames * APU_TICKS;
}
channel.accumulator += sample * (uint)frames;
total_frames -= frames;
}
}
}
