private Int32 amplitude_lfo_step(_lfo_t lfo)
{
Int32 p;
lfo.phase += (UInt16)lfo.phase_step;
p = lfo.table[(lfo.phase >> LFO_SHIFT) & 0xff];
p = lfo.scale[p];
return(p << (TL_SHIFT - LFO_SHIFT));
}
private void lfo_compute_step(_MultiPCM ptChip, _lfo_t lfo, UInt32 lfo_frequency, UInt32 lfo_scale, Int32 amplitude_lfo)
{
float step = (float)(LFO_FREQ[lfo_frequency] * 256.0f / (float)ptChip.rate);
lfo.phase_step = (UInt32)((float)(1 << LFO_SHIFT) * step);
if (amplitude_lfo != 0)
{
lfo.table = amplitude_table;
lfo.scale = amplitude_scale_tables[lfo_scale];
}
else
{
lfo.table = pitch_table;
lfo.scale = pitch_scale_tables[lfo_scale];
}
}
