Voice2 GetPlayVoice(byte param)
{
byte channelNum = (byte)(_lastMidiCommand & 0x0F);
var curVoice = _midiChannel[channelNum];
if (curVoice != null)
{
Voice2 prevVoice = null;
while (true)
{
if (curVoice.playingNote == param)
{
break;
}
prevVoice = curVoice;
curVoice = curVoice.nextVoice;
if (curVoice == null)
{
return(null);
}
}
if (prevVoice != null)
{
prevVoice.nextVoice = curVoice.nextVoice;
}
else
{
_midiChannel[channelNum] = curVoice.nextVoice;
}
}
return(curVoice);
}
static Voice2[] CreateVoices()
{
var voices = new Voice2[8];
for (int i = 0; i < voices.Length; i++)
{
voices[i] = new Voice2();
}
return(voices);
}
void ProcessRelease(Voice2 channel)
{
int newVolume = channel.curVolume - channel.releaseRate;
if (newVolume < 0)
{
newVolume = 0;
}
channel.curVolume = (byte)newVolume;
ProcessVibrato(channel);
}
void ProcessAttack(Voice2 channel)
{
int newVolume = channel.curVolume + channel.attackRate;
if (newVolume > channel.maxAmpl)
{
channel.curVolume = channel.maxAmpl;
channel.nextProcessState = EnvelopeState.Decay;
}
else
{
channel.curVolume = (byte)newVolume;
}
ProcessVibrato(channel);
}
void ProcessDecay(Voice2 channel)
{
int newVolume = channel.curVolume - channel.decayRate;
if (newVolume <= channel.sustainRate)
{
channel.curVolume = channel.sustainRate;
channel.nextProcessState = EnvelopeState.Sustain;
}
else
{
channel.curVolume = (byte)newVolume;
}
ProcessVibrato(channel);
}
void ProcessSustain(Voice2 channel)
{
if (channel.unkVibratoRate != 0)
{
short volume = (short)(channel.curVolume + channel.unkRate);
if ((volume & 0xFF00) != 0)
{
volume = (sbyte)(volume >> 8);
volume = (short)-volume;
}
channel.curVolume = (byte)volume;
--channel.unkCount;
if (channel.unkCount == 0)
{
channel.unkRate = (sbyte)-channel.unkRate;
channel.unkCount = (sbyte)((channel.unkVibratoDepth & 0x0F) << 1);
}
}
ProcessVibrato(channel);
}
void PlayVoice()
{
if (_outputTableReady != 0)
{
PlayMusicChips();
_outputTableReady = 0;
}
_octaveMask = 0xF0;
Voice2 voice = null;
for (int i = 0; i < 8; ++i)
{
voice = _cmsVoices[i];
_octaveMask = (byte)~_octaveMask;
if (voice.chanNumber != 0xFF)
{
ProcessChannel(voice);
}
else
{
if (voice.curVolume == 0)
{
voice.amplitudeOutput(0);
}
int volume = voice.curVolume - voice.releaseRate;
if (volume < 0)
{
volume = 0;
}
voice.curVolume = (byte)volume;
voice.amplitudeOutput((byte)(((volume >> 4) | (volume & 0xF0)) & voice.channel));
++_outputTableReady;
}
}
}
void ProcessChannel(Voice2 channel)
{
++_outputTableReady;
switch (channel.nextProcessState)
{
case EnvelopeState.Attack:
ProcessAttack(channel);
break;
case EnvelopeState.Decay:
ProcessDecay(channel);
break;
case EnvelopeState.Sustain:
ProcessSustain(channel);
break;
case EnvelopeState.Release:
ProcessRelease(channel);
break;
}
}
Voice2 GetFreeVoice()
{
Voice2 curVoice = null;
Voice2 selected = null;
byte volume = 0xFF;
for (int i = 0; i < 8; ++i)
{
curVoice = _cmsVoices[i];
if (curVoice.chanNumber == 0xFF)
{
if (curVoice.curVolume == 0)
{
selected = curVoice;
break;
}
if (curVoice.curVolume < volume)
{
selected = curVoice;
volume = selected.curVolume;
}
}
}
if (selected != null)
{
selected.chanNumber = (byte)(_lastMidiCommand & 0x0F);
byte channel = selected.chanNumber;
var oldChannel = _midiChannel[channel];
_midiChannel[channel] = selected;
selected.nextVoice = oldChannel;
}
return(selected);
}
void ProcessVibrato(Voice2 channel)
{
if (channel.vibratoRate != 0)
{
short temp = (short)(channel.curFreq + channel.curVibratoRate);
channel.curOctave += (byte)((temp & 0xFF00) >> 8);
channel.curFreq = (byte)(temp & 0xFF);
--channel.curVibratoUnk;
if (channel.curVibratoUnk == 0)
{
channel.curVibratoRate = (sbyte)(-channel.curVibratoRate);
channel.curVibratoUnk = (sbyte)((channel.vibratoDepth & 0x0F) << 1);
}
}
var output = channel.amplitudeOutput;
output((byte)(((channel.curVolume >> 4) | (channel.curVolume & 0xF0)) & channel.channel));
output = channel.freqOutput;
output(channel.curFreq);
output = channel.octaveOutput;
output((byte)((((channel.curOctave << 4) | (channel.curOctave & 0x0F)) & _octaveMask) | ((~_octaveMask) & channel.octaveInput())));
}
void ProcessChannel(Voice2 channel)
{
++_outputTableReady;
switch (channel.nextProcessState)
{
case EnvelopeState.Attack:
ProcessAttack(channel);
break;
case EnvelopeState.Decay:
ProcessDecay(channel);
break;
case EnvelopeState.Sustain:
ProcessSustain(channel);
break;
case EnvelopeState.Release:
ProcessRelease(channel);
break;
}
}
void ProcessAttack(Voice2 channel)
{
int newVolume = channel.curVolume + channel.attackRate;
if (newVolume > channel.maxAmpl)
{
channel.curVolume = channel.maxAmpl;
channel.nextProcessState = EnvelopeState.Decay;
}
else
{
channel.curVolume = (byte)newVolume;
}
ProcessVibrato(channel);
}
void ProcessDecay(Voice2 channel)
{
int newVolume = channel.curVolume - channel.decayRate;
if (newVolume <= channel.sustainRate)
{
channel.curVolume = channel.sustainRate;
channel.nextProcessState = EnvelopeState.Sustain;
}
else
{
channel.curVolume = (byte)newVolume;
}
ProcessVibrato(channel);
}
void ProcessSustain(Voice2 channel)
{
if (channel.unkVibratoRate != 0)
{
short volume = (short)(channel.curVolume + channel.unkRate);
if ((volume & 0xFF00) != 0)
{
volume = (sbyte)(volume >> 8);
volume = (short)-volume;
}
channel.curVolume = (byte)volume;
--channel.unkCount;
if (channel.unkCount == 0)
{
channel.unkRate = (sbyte)-channel.unkRate;
channel.unkCount = (sbyte)((channel.unkVibratoDepth & 0x0F) << 1);
}
}
ProcessVibrato(channel);
}
void ProcessVibrato(Voice2 channel)
{
if (channel.vibratoRate != 0)
{
short temp = (short)(channel.curFreq + channel.curVibratoRate);
channel.curOctave += (byte)((temp & 0xFF00) >> 8);
channel.curFreq = (byte)(temp & 0xFF);
--channel.curVibratoUnk;
if (channel.curVibratoUnk == 0)
{
channel.curVibratoRate = (sbyte)(-channel.curVibratoRate);
channel.curVibratoUnk = (sbyte)((channel.vibratoDepth & 0x0F) << 1);
}
}
var output = channel.amplitudeOutput;
output((byte)(((channel.curVolume >> 4) | (channel.curVolume & 0xF0)) & channel.channel));
output = channel.freqOutput;
output(channel.curFreq);
output = channel.octaveOutput;
output((byte)((((channel.curOctave << 4) | (channel.curOctave & 0x0F)) & _octaveMask) | ((~_octaveMask) & channel.octaveInput())));
}
static Voice2[] CreateVoices()
{
var voices = new Voice2[8];
for (int i = 0; i < voices.Length; i++)
{
voices[i] = new Voice2();
}
return voices;
}
void ProcessRelease(Voice2 channel)
{
int newVolume = channel.curVolume - channel.releaseRate;
if (newVolume < 0)
newVolume = 0;
channel.curVolume = (byte)newVolume;
ProcessVibrato(channel);
}
