int TransposeNote(int direction, int data)
{
if (data < 0)
{
return(data);
}
int note = (int)VirtualKeyboard.GetNote(data) - 1;
if (note + 1 == ( int )VirtualKeyboard.Note.NoteOff)
{
return(data);
}
int octave = VirtualKeyboard.GetOctave(data);
int offset = note + direction;
if (offset > 11)
{
octave++;
}
if (offset < 0)
{
octave--;
offset = offset + 12;
}
offset = System.Math.Abs(offset) % 12 + 1;
return(VirtualKeyboard.EncodeNoteInfo(offset, octave));
}
private void ParsePSGData(byte data)
{
bool first = (data & 128) != 0;
if (first)
{
m_CurrReg = (data >> 5) & 3;
m_CurrType = (data >> 4) & 1;
}
if (m_CurrType != 0)
{
m_LastVol[m_CurrReg] = 0x0f - (data & 0x0f);
this.data.SetData(m_CurrReg, m_CurrRow, 2, m_LastVol[m_CurrReg]);
}
else if (first && m_CurrReg == 3)
{
//set noise
int noise = (data & 7);
int nf = noise & 3;
m_NoiseCH2 = nf == 3;
m_NoiseMode = (m_NoiseCH2 ? 1 : 0);
m_NoiseMode |= ((noise >> 2) & 1) << 4;
if (!m_NoiseCH2)
{
this.data.SetData(3, m_CurrRow, 3, 0x20);
this.data.SetData(3, m_CurrRow, 4, m_NoiseMode);
this.data.SetData(3, m_CurrRow, 0, (int)VirtualKeyboard.EncodeNoteInfo(1 + nf, 3));
this.data.SetData(3, m_CurrRow, 1, 1);
this.data.SetData(m_CurrReg, m_CurrRow, 2, m_LastVol[3]);
}
}
else if (first)
{
m_CurrFreq = (data & 0x0f);
}
else
{
m_CurrFreq = (m_CurrFreq & 0x0f) | ((data & 0x3f) << 4);
byte noteData = GetEncodedNoteData(m_CurrFreq);
if (m_CurrReg != 2 || !m_NoiseCH2)
{
this.data.SetData(m_CurrReg, m_CurrRow, 0, noteData);
this.data.SetData(m_CurrReg, m_CurrRow, 1, 0);
this.data.SetData(m_CurrReg, m_CurrRow, 2, m_LastVol[m_CurrReg]);
}
else
{
this.data.SetData(3, m_CurrRow, 3, 0x20);
this.data.SetData(3, m_CurrRow, 4, m_NoiseMode);
this.data.SetData(3, m_CurrRow, 0, noteData);
this.data.SetData(3, m_CurrRow, 1, 1);
this.data.SetData(3, m_CurrRow, 2, m_LastVol[3]);
}
}
}
private byte GetEncodedNoteData(int div)
{
if (div == 0)
{
return(VirtualKeyboard.EncodeNoteInfo(1, 12));
}
int invRelativenote;
int freq = (int)SN76489.Clock.PAL / (2 * div * 16);
int relNote = Mathf.RoundToInt(Mathf.Log(freq * 440) / Mathf.Log(Mathf.Pow(2, 1f / 12f))) + 12 * 3 + 2;
int note = (relNote % 12) + 1;
int octave = relNote / 12;
return(VirtualKeyboard.EncodeNoteInfo(note, octave));
}