private void PsgDevice_OnIrbHandler(IPsgDevice sender, PsgPortState state)
{
if (!state.DirOut)
{
state.InState = 0xFE; /*always ready??? Alone Coder us0.36.6*/
}
}
private void PsgDevice_OnUpdateIra(IPsgDevice sender, PsgPortState state)
{
//
// Emulation AY-Mouse (V.M.G. schema)
//
int x = 0;
int y = 0;
int b = 0;
if (MouseState != null)
{
x = MouseState.X;
y = MouseState.Y;
b = MouseState.Buttons;
}
int pcDelta;
if ((state.OutState & 0x40) != 0) // selected V counter
{
pcDelta = _lastAyMouseY - y / 4;
}
else // selected H counter
{
pcDelta = x / 4 - _lastAyMouseX;
}
// make signed 4 bit integer...
pcDelta = pcDelta + 8;
// prevent overflow (this feature not present in original schema)...
if (pcDelta < 0)
{
pcDelta = 0;
}
if (pcDelta > 15)
{
pcDelta = 15;
}
// buttons 0 and 1...
state.InState = (byte)((pcDelta & 0x0F) | ((b & 3) ^ 3) << 4 | (state.OutState & 0xC0));
if (state.DirOut && ((state.OutState ^ state.OldOutState) & 0x40) != 0 && (state.OutState & 0x40) == 0)
{
// reset H and V counters
_lastAyMouseX = x / 4;
_lastAyMouseY = y / 4;
}
}
