void dx7_voice_recalculate_volume(hexter_instance instance)
{
float f;
int i;
this.last_port_volume = instance.volume;
this.last_cc_volume = instance.cc_volume;
/* This 41 OL volume cc mapping matches my TX7 fairly well, to within
* +/-0.8dB for most of the scale. (It even duplicates the "feature"
* of not going completely silent at zero....) */
f = (instance.volume - 20.0f) * 1.328771f + 86.0f;
f += (float)instance.cc_volume * 41.0f / 16256.0f;
i = (int)Math.Round(f - 0.5f);
f -= (float)i;
this.volume_target = (Inline.FP_TO_FLOAT(Data.dx7_voice_eg_ol_to_amp_table[128 + i]) +
f * Inline.FP_TO_FLOAT(Data.dx7_voice_eg_ol_to_amp_table[128 + i + 1] -
Data.dx7_voice_eg_ol_to_amp_table[128 + i])) *
0.110384f / Data.dx7_voice_carrier_count[this.algorithm];
if (this.volume_value < 0.0f)
{ /* initial setup */
this.volume_value = this.volume_target;
this.volume_duration = 0;
}
else
{
this.volume_duration = instance.ramp_duration;
this.volume_increment = (this.volume_target - this.volume_value) /
(float)this.volume_duration;
}
}
