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https://github.com/TomHarte/CLK.git
synced 2024-11-25 16:31:42 +00:00
Ensured the PIA timer resumes its normal tick rate after being read; fixed those spaces that had crept in where tabs should be.
This commit is contained in:
Thomas Harte
parent
42677f5f83
commit
aebf636528
@ -145,10 +145,10 @@ void Machine::output_pixels(int count)
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// update hmove
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if (!(_horizontalTimer&3) && _hMoveFlags) {
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for(int c = 0; c < 5; c++) {
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if ((_hMoveCounter^8^(_objectMotion[c] >> 4)) == 0xf) _hMoveFlags &= ~(1 << c);
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if (_hMoveFlags&(1 << c)) _objectCounter[c] = (_objectCounter[c]+1)%160;
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}
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for(int c = 0; c < 5; c++) {
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if ((_hMoveCounter^8^(_objectMotion[c] >> 4)) == 0xf) _hMoveFlags &= ~(1 << c);
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if (_hMoveFlags&(1 << c)) _objectCounter[c] = (_objectCounter[c]+1)%160;
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}
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_hMoveCounter = (_hMoveCounter-1)&0xf;
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}
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@ -206,8 +206,8 @@ void Machine::output_pixels(int count)
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get_output_pixel(&_outputBuffer[_lastOutputStateDuration * 4], 159 - _horizontalTimer);
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// increment all graphics counters
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for(int c = 0; c < 5; c++)
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_objectCounter[c] = (_objectCounter[c]+1)%160;
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for(int c = 0; c < 5; c++)
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_objectCounter[c] = (_objectCounter[c]+1)%160;
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}
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// assumption here: signed shifts right; otherwise it's just
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@ -266,7 +266,7 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
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case 0x07: returnValue &= 0x3f; break; // player / player, missile / missile collisions
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}
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} else {
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const uint16_t decodedAddress = address & 0x3f;
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const uint16_t decodedAddress = address & 0x3f;
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switch(decodedAddress) {
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case 0x00: _vSyncEnabled = !!(*value & 0x02); break;
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case 0x01: _vBlankEnabled = !!(*value & 0x02); break;
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@ -328,10 +328,10 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
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case 0x28:
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case 0x29:
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if (!(*value&0x02) && _missileGraphicsReset[decodedAddress - 0x28]&0x02)
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_objectCounter[decodedAddress - 0x26] = _objectCounter[decodedAddress - 0x28]; // TODO: +3 for normal, +6 for double, +10 for quad
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_missileGraphicsReset[decodedAddress - 0x28] = *value;
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break;
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if (!(*value&0x02) && _missileGraphicsReset[decodedAddress - 0x28]&0x02)
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_objectCounter[decodedAddress - 0x26] = _objectCounter[decodedAddress - 0x28]; // TODO: +3 for normal, +6 for double, +10 for quad
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_missileGraphicsReset[decodedAddress - 0x28] = *value;
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break;
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case 0x2a:
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_vBlankExtend = true;
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@ -339,12 +339,12 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
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_hMoveFlags = 0x1f;
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break;
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case 0x2b:
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_objectMotion[0] =
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_objectMotion[1] =
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_objectMotion[2] =
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_objectMotion[3] =
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_objectMotion[4] = 0;
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break;
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_objectMotion[0] =
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_objectMotion[1] =
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_objectMotion[2] =
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_objectMotion[3] =
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_objectMotion[4] = 0;
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break;
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}
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}
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// printf("Uncaught TIA %04x\n", address);
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@ -354,15 +354,25 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
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if ((address&0x1280) == 0x280) {
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if(isReadOperation(operation)) {
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switch(address & 0xf) {
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case 0x04: returnValue &= _piaTimerValue >> _piaTimerShift; break;
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case 0x05: returnValue &= _piaTimerStatus; _piaTimerStatus &= ~0x40; break;
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case 0x04:
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returnValue &= _piaTimerValue >> _piaTimerShift;
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if(_writtenPiaTimerShift != _piaTimerShift) {
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_piaTimerShift = _writtenPiaTimerShift;
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_piaTimerValue <<= _writtenPiaTimerShift;
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}
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break;
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case 0x05:
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returnValue &= _piaTimerStatus;
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_piaTimerStatus &= ~0x40;
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break;
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}
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} else {
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switch(address & 0x0f) {
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case 0x04: _piaTimerShift = 0; _piaTimerValue = *value << 0; _piaTimerStatus &= ~0xc0; break;
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case 0x05: _piaTimerShift = 3; _piaTimerValue = *value << 3; _piaTimerStatus &= ~0xc0; break;
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case 0x06: _piaTimerShift = 6; _piaTimerValue = *value << 6; _piaTimerStatus &= ~0xc0; break;
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case 0x07: _piaTimerShift = 10; _piaTimerValue = *value << 10; _piaTimerStatus &= ~0xc0; break;
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case 0x04: _writtenPiaTimerShift = _piaTimerShift = 0; _piaTimerValue = *value << 0; _piaTimerStatus &= ~0xc0; break;
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case 0x05: _writtenPiaTimerShift = _piaTimerShift = 3; _piaTimerValue = *value << 3; _piaTimerStatus &= ~0xc0; break;
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case 0x06: _writtenPiaTimerShift = _piaTimerShift = 6; _piaTimerValue = *value << 6; _piaTimerStatus &= ~0xc0; break;
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case 0x07: _writtenPiaTimerShift = _piaTimerShift = 10; _piaTimerValue = *value << 10; _piaTimerStatus &= ~0xc0; break;
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}
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}
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// printf("Uncaught PIA %04x\n", address);
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@ -37,7 +37,7 @@ class Machine: public CPU6502::Processor<Machine> {
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// the timer
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unsigned int _piaTimerValue;
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unsigned int _piaTimerShift;
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unsigned int _piaTimerShift, _writtenPiaTimerShift;
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uint8_t _piaTimerStatus;
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// playfield registers
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@ -67,7 +67,7 @@ class Machine: public CPU6502::Processor<Machine> {
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bool _vSyncEnabled, _vBlankEnabled;
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bool _vBlankExtend;
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uint8_t _hMoveCounter, _hMoveFlags;
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uint8_t _objectCounter[5], _objectMotion[5];
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uint8_t _objectCounter[5], _objectMotion[5];
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enum OutputState {
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Sync,
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@ -101,14 +101,14 @@ CRT::SyncEvent CRT::get_next_vertical_sync_event(bool vsync_is_requested, int cy
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SyncEvent proposedEvent = SyncEvent::None;
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int proposedSyncTime = cycles_to_run_for;
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// will an acceptable vertical sync be triggered?
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if (vsync_is_requested && !_is_in_vsync) {
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// will an acceptable vertical sync be triggered?
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if (vsync_is_requested && !_is_in_vsync) {
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if (_sync_capacitor_charge_level >= _sync_capacitor_charge_threshold) {// && _rasterPosition.y >= (kCRTFixedPointRange * 7) >> 3) {
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proposedSyncTime = 0;
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proposedEvent = SyncEvent::StartVSync;
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_did_detect_vsync = true;
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}
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}
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}
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// have we overrun the maximum permitted number of horizontal syncs for this frame?
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if (!_is_in_vsync) {
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@ -346,21 +346,21 @@ void CRT::output_sync(int number_of_cycles)
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void CRT::output_blank(int number_of_cycles)
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{
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bool _vsync_requested = _is_receiving_sync;
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bool _vsync_requested = _is_receiving_sync;
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_is_receiving_sync = false;
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advance_cycles(number_of_cycles, false, _vsync_requested, false, Type::Blank, nullptr);
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}
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void CRT::output_level(int number_of_cycles, const char *type)
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{
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bool _vsync_requested = _is_receiving_sync;
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bool _vsync_requested = _is_receiving_sync;
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_is_receiving_sync = false;
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advance_cycles(number_of_cycles, false, _vsync_requested, false, Type::Level, type);
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}
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void CRT::output_data(int number_of_cycles, const char *type)
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{
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bool _vsync_requested = _is_receiving_sync;
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bool _vsync_requested = _is_receiving_sync;
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_is_receiving_sync = false;
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advance_cycles(number_of_cycles, false, _vsync_requested, false, Type::Data, type);
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}
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