void opCXCLR(ushort addr, byte data)
{
Collisions = 0;
}
void DoVisibleScanline(int updateClocks, int hposStart)
{
int hpos = hposStart;
// emulate polynomial counters for each of the objects
// 160 is added to prevent negative values
// each counter is mod'd w/160 to provide wraparound
int p0c = hpos - P0pos + 160;
int p1c = hpos - P1pos + 160;
int m0c = hpos - M0pos + 160;
int m1c = hpos - M1pos + 160;
int blc = hpos - BLpos + 160;
CxFlags cxflags;
int SLindex = FBindex % 160;
int fidx_end = SLindex + updateClocks;
byte fbyte;
byte fbyte_colupf = colupf;
bool colupfon;
// crt gun is off
if (vblankon)
{
for (int fidx = SLindex; fidx < fidx_end; fidx++)
{
ScanlineBuffer[fidx] = 0;
}
goto done;
}
for (int fidx = SLindex; fidx < fidx_end; fidx++, hpos++, p0c++, p1c++, m0c++, m1c++, blc++)
{
if (LateHMOVEBlankOn)
{
if (hpos < 8)
{
ScanlineBuffer[fidx] = 0;
continue;
}
else
{
LateHMOVEBlankOn = false;
}
}
if (hpos == 76)
{
PFReflectionState = RegW[CTRLPF] & 0x01;
}
fbyte = colubk;
cxflags = 0;
// provide wraparound for the counters
p0c %= 160;
p1c %= 160;
m0c %= 160;
m1c %= 160;
blc %= 160;
colupfon = false;
if ((PF210 & TIATables.PFMask[PFReflectionState, hpos]) != 0)
{
if (scoreon)
{
fbyte_colupf = hpos < 80 ? colup0 : colup1;
}
colupfon = true;
cxflags |= CxFlags.PF;
}
if (blon && TIATables.BLMask[BLsize, blc])
{
colupfon = true;
cxflags |= CxFlags.BL;
}
if (!pfpriority && colupfon)
{
fbyte = fbyte_colupf;
}
if (m1on && TIATables.MxMask[M1size, M1type, m1c])
{
fbyte = colup1;
cxflags |= CxFlags.M1;
}
if (p1on && (TIATables.PxMask[P1suppress, P1type, p1c] & EffGRP1) != 0)
{
fbyte = colup1;
cxflags |= CxFlags.P1;
}
if (m0on && TIATables.MxMask[M0size, M0type, m0c])
{
fbyte = colup0;
cxflags |= CxFlags.M0;
}
if (p0on && (TIATables.PxMask[P0suppress, P0type, p0c] & EffGRP0) != 0)
{
fbyte = colup0;
cxflags |= CxFlags.P0;
}
if (pfpriority && colupfon)
{
fbyte = fbyte_colupf;
}
Collisions |= TIATables.CollisionMask[(int)cxflags];
ScanlineBuffer[fidx] = fbyte;
}
done:
if (M.H != null)
{
M.H.UpdateDisplay(ScanlineBuffer, FBindex / 160, hposStart,
updateClocks);
}
}