// Execute TIA cycles
public void Execute(int cycles)
{
// Still ignoring cycles...
// delay vblank latch
if (_vblankDelay > 0)
{
_vblankDelay++;
if (_vblankDelay == 3)
{
_vblankEnabled = (_vblankValue & 0x02) != 0;
_vblankDelay = 0;
}
}
// delay latch to new playfield register
if (_pf0Updater)
{
_pf0DelayClock++;
if (_pf0DelayClock > _pf0MaxDelay)
{
_playField.Grp = (uint)((_playField.Grp & 0x0FFFF) + ((ReverseBits(_pf0Update, 8) & 0x0F) << 16));
_pf0Updater = false;
}
}
if (_pf1Updater)
{
_pf1DelayClock++;
if (_pf1DelayClock > _pf1MaxDelay)
{
_playField.Grp = (uint)((_playField.Grp & 0xF00FF) + (_pf1Update << 8));
_pf1Updater = false;
}
}
if (_pf2Updater)
{
_pf2DelayClock++;
if (_pf2DelayClock > _pf2MaxDelay)
{
_playField.Grp = (uint)((_playField.Grp & 0xFFF00) + ReverseBits(_pf2Update, 8));
_pf2Updater = false;
}
}
// delay latch to missile enable
if (_enam0Delay > 0)
{
_enam0Delay++;
if (_enam0Delay == 3)
{
_enam0Delay = 0;
_player0.Missile.Enabled = _enam0Val;
}
}
if (_enam1Delay > 0)
{
_enam1Delay++;
if (_enam1Delay == 3)
{
_enam1Delay = 0;
_player1.Missile.Enabled = _enam1Val;
}
}
// delay latch to ball enable
if (_enambDelay > 0)
{
_enambDelay++;
if (_enambDelay == 3)
{
_enambDelay = 0;
_ball.Enabled = _enambVal;
}
}
// delay latch to player graphics registers
if (_prg0Delay > 0)
{
_prg0Delay++;
if (_prg0Delay == 3)
{
_prg0Delay = 0;
_player0.Grp = _prg0Val;
_player1.Dgrp = _player1.Grp;
}
}
if (_prg1Delay > 0)
{
_prg1Delay++;
if (_prg1Delay == 3)
{
_prg1Delay = 0;
_player1.Grp = _prg1Val;
_player0.Dgrp = _player0.Grp;
// TODO: Find a game that uses this functionality and test it
_ball.Denabled = _ball.Enabled;
}
}
// HMP write delay
if (_hmp0Delay > 0)
{
_hmp0Delay++;
if (_hmp0Delay == 4)
{
_hmp0Delay = 0;
_player0.HM = _hmp0Val;
}
}
if (_hmp1Delay > 0)
{
_hmp1Delay++;
if (_hmp1Delay == 3)
{
_hmp1Delay = 0;
_player1.HM = _hmp1Val;
}
}
// Reset the RDY flag when we reach hblank
if (_hsyncCnt <= 0)
{
_core.Cpu.RDY = true;
}
// Assume we're on the left side of the screen for now
var rightSide = false;
// ---- Things that happen only in the drawing section ----
// TODO: Remove this magic number (17). It depends on the HMOVE
if (_hsyncCnt >= (_hmove.LateHBlankReset ? 76 : 68))
{
_doTicks = false;
// TODO: Remove this magic number
if ((_hsyncCnt / 4) >= 37)
{
rightSide = true;
}
// The bit number of the PF data which we want
int pfBit = ((_hsyncCnt / 4) - 17) % 20;
// Create the mask for the bit we want
// Note that bits are arranged 0 1 2 3 4 .. 19
int pfMask = 1 << (20 - 1 - pfBit);
// Reverse the mask if on the right and playfield is reflected
if (rightSide && _playField.Reflect)
{
pfMask = ReverseBits(pfMask, 20);
}
// Calculate collisions
byte collisions = 0x00;
if ((_playField.Grp & pfMask) != 0)
{
collisions |= CXPF;
}
// ---- Player 0 ----
collisions |= _player0.Tick() ? CXP0 : (byte)0x00;
// ---- Missile 0 ----
collisions |= _player0.Missile.Tick() ? CXM0 : (byte)0x00;
// ---- Player 1 ----
collisions |= _player1.Tick() ? CXP1 : (byte)0x00;
// ---- Missile 0 ----
collisions |= _player1.Missile.Tick() ? CXM1 : (byte)0x00;
// ---- Ball ----
collisions |= _ball.Tick() ? CXBL : (byte)0x00;
// Pick the pixel color from collisions
int pixelColor = BackColor;
if (_core.Settings.ShowBG)
{
pixelColor = _palette[_playField.BkColor];
}
if ((collisions & CXPF) != 0 && _core.Settings.ShowPlayfield)
{
if (_playField.Score)
{
pixelColor = !rightSide
? _palette[_player0.Color]
: _palette[_player1.Color];
}
else
{
pixelColor = _palette[_playField.PfColor];
}
}
if ((collisions & CXBL) != 0)
{
_ball.Collisions |= collisions;
if (_core.Settings.ShowBall)
{
pixelColor = _palette[_playField.PfColor];
}
}
if ((collisions & CXM1) != 0)
{
_player1.Missile.Collisions |= collisions;
if (_core.Settings.ShowMissle2)
{
pixelColor = _palette[_player1.Color];
}
}
if ((collisions & CXP1) != 0)
{
_player1.Collisions |= collisions;
if (_core.Settings.ShowPlayer2)
{
pixelColor = _palette[_player1.Color];
}
}
if ((collisions & CXM0) != 0)
{
_player0.Missile.Collisions |= collisions;
if (_core.Settings.ShowMissle1)
{
pixelColor = _palette[_player0.Color];
}
}
if ((collisions & CXP0) != 0)
{
_player0.Collisions |= collisions;
if (_core.Settings.ShowPlayer1)
{
pixelColor = _palette[_player0.Color];
}
}
if (_playField.Score && !_playField.Priority && ((collisions & CXPF) != 0) && _core.Settings.ShowPlayfield)
{
pixelColor = !rightSide ? _palette[_player0.Color] : _palette[_player1.Color];
}
if (_playField.Priority && (collisions & CXPF) != 0 && _core.Settings.ShowPlayfield)
{
pixelColor = _palette[_playField.PfColor];
}
// Handle vblank
if (_vblankEnabled)
{
pixelColor = BackColor;
}
// Add the pixel to the scanline
// TODO: Remove this magic number (68)
int y = _currentScanLine;
// y >= max screen height means lag frame or game crashed, but is a legal situation.
// either way, there's nothing to display
if (y < MaxScreenHeight)
{
int x = _hsyncCnt - 68;
if (x < 0 || x > 159) // this can't happen, right?
{
throw new Exception(); // TODO
}
_scanlinebuffer[(_currentScanLine * ScreenWidth) + x] = pixelColor;
}
}
else
{
_doTicks = true;
}
// if extended HBLank is active, the screen area still needs a color
if (_hsyncCnt >= 68 && _hsyncCnt < 76 && _hmove.LateHBlankReset)
{
int pixelColor = 0;
// Add the pixel to the scanline
// TODO: Remove this magic number (68)
int y = _currentScanLine;
// y >= max screen height means lag frame or game crashed, but is a legal situation.
// either way, there's nothing to display
if (y < MaxScreenHeight)
{
int x = _hsyncCnt - 68;
if (x < 0 || x > 159) // this can't happen, right?
{
throw new Exception(); // TODO
}
_scanlinebuffer[(_currentScanLine * ScreenWidth) + x] = pixelColor;
}
}
// Handle HMOVE
if (_hmove.HMoveEnabled)
{
if (_hmove.DecCntEnabled)
{
// Actually do stuff only evey 4 pulses
if (_hmove.HMoveCnt == 0)
{
// If the latch is still set
if (_hmove.Player0Latch)
{
// If the move counter still has a bit in common with the HM register
if (((15 - _hmove.Player0Cnt) ^ ((_player0.HM & 0x07) | ((~(_player0.HM & 0x08)) & 0x08))) != 0x0F)
{
_p0Stuff = true;
}
else
{
_hmove.Player0Latch = false;
}
}
if (_hmove.Missile0Latch)
{
// If the move counter still has a bit in common with the HM register
if (((15 - _hmove.Missile0Cnt) ^ ((_player0.Missile.Hm & 0x07) | ((~(_player0.Missile.Hm & 0x08)) & 0x08))) != 0x0F)
{
_m0Stuff = true;
}
else
{
_hmove.Missile0Latch = false;
}
}
if (_hmove.Player1Latch)
{
// If the move counter still has a bit in common with the HM register
if (((15 - _hmove.Player1Cnt) ^ ((_player1.HM & 0x07) | ((~(_player1.HM & 0x08)) & 0x08))) != 0x0F)
{
_p1Stuff = true;
}
else
{
_hmove.Player1Latch = false;
}
}
if (_hmove.Missile1Latch)
{
// If the move counter still has a bit in common with the HM register
if (((15 - _hmove.Missile1Cnt) ^ ((_player1.Missile.Hm & 0x07) | ((~(_player1.Missile.Hm & 0x08)) & 0x08))) != 0x0F)
{
_m1Stuff = true;
}
else
{
_hmove.Missile1Latch = false;
}
}
if (_hmove.BallLatch)
{
// If the move counter still has a bit in common with the HM register
if (((15 - _hmove.BallCnt) ^ ((_ball.HM & 0x07) | ((~(_ball.HM & 0x08)) & 0x08))) != 0x0F)
{
_bStuff = true;
}
else
{
_hmove.BallLatch = false;
}
}
if (!_hmove.Player0Latch && !_hmove.Player1Latch && !_hmove.BallLatch && !_hmove.Missile0Latch && !_hmove.Missile1Latch)
{
_hmove.HMoveEnabled = false;
_hmove.DecCntEnabled = false;
_hmove.HMoveDelayCnt = 0;
}
}
_hmove.HMoveCnt++;
_hmove.HMoveCnt %= 4;
if (_p0Stuff && _hsyncCnt % 4 == 0)
{
_p0Stuff = false;
// "Clock-Stuffing"
if (_doTicks)
{
_player0.Tick();
}
// Increase by 1, max of 15
_hmove.test_count_p0++;
if (_hmove.test_count_p0 < 16)
{
_hmove.Player0Cnt++;
}
else
{
_hmove.Player0Cnt = 0;
}
}
if (_p1Stuff && _hsyncCnt % 4 == 0)
{
_p1Stuff = false;
// "Clock-Stuffing"
if (_doTicks)
{
_player1.Tick();
}
// Increase by 1, max of 15
_hmove.test_count_p1++;
if (_hmove.test_count_p1 < 16)
{
_hmove.Player1Cnt++;
}
else
{
_hmove.Player1Cnt = 0;
}
}
if (_m0Stuff && _hsyncCnt % 4 == 0)
{
_m0Stuff = false;
// "Clock-Stuffing"
if (_doTicks)
{
_player0.Missile.Tick();
}
// Increase by 1, max of 15
_hmove.test_count_m0++;
if (_hmove.test_count_m0 < 16)
{
_hmove.Missile0Cnt++;
}
else
{
_hmove.Missile0Cnt = 0;
}
}
if (_m1Stuff && _hsyncCnt % 4 == 0)
{
_m1Stuff = false;
// "Clock-Stuffing"
if (_doTicks)
{
_player1.Missile.Tick();
}
// Increase by 1, max of 15
_hmove.test_count_m1++;
if (_hmove.test_count_m1 < 16)
{
_hmove.Missile1Cnt++;
}
else
{
_hmove.Missile1Cnt = 0;
}
}
if (_bStuff && _hsyncCnt % 4 == 0)
{
_bStuff = false;
// "Clock-Stuffing"
if (_doTicks)
{
_ball.Tick();
}
// Increase by 1, max of 15
_hmove.test_count_b++;
if (_hmove.test_count_b < 16)
{
_hmove.BallCnt++;
}
else
{
_hmove.BallCnt = 0;
}
}
}
if (_hmove.HMoveDelayCnt < 5)
{
_hmove.HMoveDelayCnt++;
}
if (_hmove.HMoveDelayCnt == 5)
{
_hmove.HMoveDelayCnt++;
_hmove.HMoveCnt = 0;
_hmove.DecCntEnabled = true;
_hmove.test_count_p0 = 0;
_hmove.test_count_p1 = 0;
_hmove.test_count_m0 = 0;
_hmove.test_count_m1 = 0;
_hmove.test_count_b = 0;
_hmove.Player0Latch = true;
_hmove.Player0Cnt = 0;
_hmove.Missile0Latch = true;
_hmove.Missile0Cnt = 0;
_hmove.Player1Latch = true;
_hmove.Player1Cnt = 0;
_hmove.Missile1Latch = true;
_hmove.Missile1Cnt = 0;
_hmove.BallLatch = true;
_hmove.BallCnt = 0;
_hmove.LateHBlankReset = true;
}
}
// do the audio sampling
if (_hsyncCnt == 36 || _hsyncCnt == 148)
{
LocalAudioCycles[AudioClocks] += (short)(AUD[0].Cycle() / 2);
LocalAudioCycles[AudioClocks] += (short)(AUD[1].Cycle() / 2);
AudioClocks++;
}
// Increment the hsync counter
_hsyncCnt++;
_hsyncCnt %= 228;
// End of the line? Add it to the buffer!
if (_hsyncCnt == 0)
{
_hmove.LateHBlankReset = false;
_currentScanLine++;
LineCount++;
}
}
// Execute TIA cycles
public void Execute(int cycles)
{
// Still ignoring cycles...
// Assume we're on the left side of the screen for now
var rightSide = false;
// ---- Things that happen only in the drawing section ----
// TODO: Remove this magic number (17). It depends on the HMOVE
if ((_hsyncCnt / 4) >= (_hmove.LateHBlankReset ? 19 : 17))
{
// TODO: Remove this magic number
if ((_hsyncCnt / 4) >= 37)
{
rightSide = true;
}
// The bit number of the PF data which we want
int pfBit = ((_hsyncCnt / 4) - 17) % 20;
// Create the mask for the bit we want
// Note that bits are arranged 0 1 2 3 4 .. 19
int pfMask = 1 << (20 - 1 - pfBit);
// Reverse the mask if on the right and playfield is reflected
if (rightSide && _playField.Reflect)
{
pfMask = ReverseBits(pfMask, 20);
}
// Calculate collisions
byte collisions = 0x00;
if ((_playField.Grp & pfMask) != 0)
{
collisions |= CXPF;
}
// ---- Player 0 ----
collisions |= _player0.Tick() ? CXP0 : (byte)0x00;
// ---- Missile 0 ----
collisions |= _player0.Missile.Tick() ? CXM0 : (byte)0x00;
// ---- Player 1 ----
collisions |= _player1.Tick() ? CXP1 : (byte)0x00;
// ---- Missile 0 ----
collisions |= _player1.Missile.Tick() ? CXM1 : (byte)0x00;
// ---- Ball ----
collisions |= _ball.Tick() ? CXBL : (byte)0x00;
// Pick the pixel color from collisions
int pixelColor = BackColor;
if (_core.Settings.ShowBG)
{
pixelColor = _palette[_playField.BkColor];
}
if ((collisions & CXPF) != 0 && _core.Settings.ShowPlayfield)
{
if (_playField.Score)
{
if (!rightSide)
{
pixelColor = _palette[_player0.Color];
}
else
{
pixelColor = _palette[_player1.Color];
}
}
else
{
pixelColor = _palette[_playField.PfColor];
}
}
if ((collisions & CXBL) != 0)
{
_ball.Collisions |= collisions;
if (_core.Settings.ShowBall)
{
pixelColor = _palette[_playField.PfColor];
}
}
if ((collisions & CXM1) != 0)
{
_player1.Missile.Collisions |= collisions;
if (_core.Settings.ShowMissle2)
{
pixelColor = _palette[_player1.Color];
}
}
if ((collisions & CXP1) != 0)
{
_player1.Collisions |= collisions;
if (_core.Settings.ShowPlayer2)
{
pixelColor = _palette[_player1.Color];
}
}
if ((collisions & CXM0) != 0)
{
_player0.Missile.Collisions |= collisions;
if (_core.Settings.ShowMissle1)
{
pixelColor = _palette[_player0.Color];
}
}
if ((collisions & CXP0) != 0)
{
_player0.Collisions |= collisions;
if (_core.Settings.ShowPlayer1)
{
pixelColor = _palette[_player0.Color];
}
}
if (_playField.Priority && (collisions & CXPF) != 0 && _core.Settings.ShowPlayfield)
{
if (_playField.Score)
{
pixelColor = !rightSide ? _palette[_player0.Color] : _palette[_player1.Color];
}
else
{
pixelColor = _palette[_playField.PfColor];
}
}
// Handle vblank
if (_vblankEnabled)
{
pixelColor = BackColor;
}
// Add the pixel to the scanline
// TODO: Remove this magic number (68)
int y = _CurrentScanLine;
// y >= max screen height means lag frame or game crashed, but is a legal situation.
// either way, there's nothing to display
if (y < MaxScreenHeight)
{
int x = _hsyncCnt - 68;
if (x < 0 || x > 159) // this can't happen, right?
{
throw new Exception(); // TODO
}
_scanlinebuffer[_CurrentScanLine * ScreenWidth + x] = pixelColor;
}
}
// ---- Things that happen every time ----
// Handle HMOVE
if (_hmove.HMoveEnabled)
{
// On the first time, set the latches and counters
if (_hmove.HMoveJustStarted)
{
_hmove.Player0Latch = true;
_hmove.Player0Cnt = 0;
_hmove.Missile0Latch = true;
_hmove.Missile0Cnt = 0;
_hmove.Player1Latch = true;
_hmove.Player1Cnt = 0;
_hmove.Missile1Latch = true;
_hmove.Missile1Cnt = 0;
_hmove.BallLatch = true;
_hmove.BallCnt = 0;
_hmove.HMoveCnt = 0;
_hmove.HMoveJustStarted = false;
_hmove.LateHBlankReset = true;
_hmove.DecCntEnabled = false;
}
if (_hmove.DecCntEnabled)
{
// Actually do stuff only evey 4 pulses
if (_hmove.HMoveCnt == 0)
{
// If the latch is still set
if (_hmove.Player0Latch)
{
// If the move counter still has a bit in common with the HM register
if (((15 - _hmove.Player0Cnt) ^ ((_player0.HM & 0x07) | ((~(_player0.HM & 0x08)) & 0x08))) != 0x0F)
{
// "Clock-Stuffing"
_player0.Tick();
// Increase by 1, max of 15
_hmove.Player0Cnt++;
_hmove.Player0Cnt %= 16;
}
else
{
_hmove.Player0Latch = false;
}
}
if (_hmove.Missile0Latch)
{
if (_hmove.Missile0Cnt == 15)
{
}
// If the move counter still has a bit in common with the HM register
if (((15 - _hmove.Missile0Cnt) ^ ((_player0.Missile.Hm & 0x07) | ((~(_player0.Missile.Hm & 0x08)) & 0x08))) != 0x0F)
{
// "Clock-Stuffing"
_player0.Missile.Tick();
// Increase by 1, max of 15
_hmove.Missile0Cnt++;
_hmove.Missile0Cnt %= 16;
}
else
{
_hmove.Missile0Latch = false;
_hmove.Missile0Cnt = 0;
}
}
if (_hmove.Player1Latch)
{
// If the move counter still has a bit in common with the HM register
if (((15 - _hmove.Player1Cnt) ^ ((_player1.HM & 0x07) | ((~(_player1.HM & 0x08)) & 0x08))) != 0x0F)
{
// "Clock-Stuffing"
_player1.Tick();
// Increase by 1, max of 15
_hmove.Player1Cnt++;
_hmove.Player1Cnt %= 16;
}
else
{
_hmove.Player1Latch = false;
}
}
if (_hmove.Missile1Latch)
{
// If the move counter still has a bit in common with the HM register
if (((15 - _hmove.Missile1Cnt) ^ ((_player1.Missile.Hm & 0x07) | ((~(_player1.Missile.Hm & 0x08)) & 0x08))) != 0x0F)
{
// "Clock-Stuffing"
_player1.Missile.Tick();
// Increase by 1, max of 15
_hmove.Missile1Cnt++;
_hmove.Missile1Cnt %= 16;
}
else
{
_hmove.Missile1Latch = false;
}
}
if (_hmove.BallLatch)
{
// If the move counter still has a bit in common with the HM register
if (((15 - _hmove.BallCnt) ^ ((_ball.HM & 0x07) | ((~(_ball.HM & 0x08)) & 0x08))) != 0x0F)
{
// "Clock-Stuffing"
_ball.Tick();
// Increase by 1, max of 15
_hmove.BallCnt++;
_hmove.BallCnt %= 16;
}
else
{
_hmove.BallLatch = false;
}
}
if (!_hmove.Player0Latch && !_hmove.Player1Latch && !_hmove.BallLatch && !_hmove.Missile0Latch && !_hmove.Missile1Latch)
{
_hmove.HMoveEnabled = false;
_hmove.DecCntEnabled = false;
_hmove.HMoveDelayCnt = 0;
}
}
_hmove.HMoveCnt++;
_hmove.HMoveCnt %= 4;
}
if (_hmove.HMoveDelayCnt < 6)
{
_hmove.HMoveDelayCnt++;
}
if (_hmove.HMoveDelayCnt == 6)
{
_hmove.HMoveDelayCnt++;
_hmove.HMoveCnt = 0;
_hmove.DecCntEnabled = true;
}
}
// Increment the hsync counter
_hsyncCnt++;
_hsyncCnt %= 228;
// End of the line? Add it to the buffer!
if (_hsyncCnt == 0)
{
_hmove.LateHBlankReset = false;
_CurrentScanLine++;
LineCount++;
_audioClocks += 2; // TODO: increment this at the appropriate places twice per line
}
}