private void resetSample(byte chipID)
{
chipID &= 1;
GigatronState g = gig[chipID];
g.soundTable = new byte[256];
int r = (int)DateTime.Now.Ticks;
for (int i = 0; i < 64; i++)
{
//noise
r += r * 56465321 + 456156321;
g.soundTable[i * 4 + 0] = (byte)(r & 63);
//Triangle
g.soundTable[i * 4 + 1] = (byte)(i < 32 ? 2 * i : (127 - 2 * i));
//Pulse
g.soundTable[i * 4 + 2] = (byte)(i < 32 ? 0 : 63);
//Sawtooth
g.soundTable[i * 4 + 3] = (byte)i;
}
}
public override int Write(byte chipID, int port, int adr, int data)
{
chipID &= 1;
GigatronState g = gig[chipID];
ushort ad = (ushort)adr;
byte dat = (byte)data;
if (ad == 0x21)
{
g.channelMask = (byte)(dat & 0x7);
return(0);
}
int hi = ad & 0xff00;
int lo = ad & 0xff;
if (hi == 0x0700)
{
g.soundTable[lo] = dat;
return(0);
}
if (lo < 250)
{
return(0);
}
if (hi < 0x100)
{
return(0);
}
if (hi > 0x400)
{
return(0);
}
Channel c = g.ch[(hi >> 8) - 1];
switch (lo)
{
case 250:
c.wavA = dat;
break;
case 251:
c.wavX = dat;
break;
case 252:
c.key = (short)((c.key & 0xff80) | (dat & 0x7f));
break;
case 253:
c.key = (short)((c.key & 0x007f) | (dat << 7));
break;
case 254:
c.osc = (short)((c.osc & 0xff80) | (dat & 0x7f));
break;
case 255:
c.osc = (short)((c.osc & 0x007f) | (dat << 7));
break;
}
return(0);
}
