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https://github.com/TomHarte/CLK.git
synced 2024-11-25 16:31:42 +00:00
Reintroduced emergency vertical sync — so that output occurs even when the emulation isn't catching syncs properly — and switched some spaces to tabs.
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@ -20,7 +20,7 @@ Machine::Machine()
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_lastOutputStateDuration = 0;
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_lastOutputState = OutputState::Sync;
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_crt = new Outputs::CRT(228, 256, 1, 4);
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_piaTimerStatus = 0xff;
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_piaTimerStatus = 0xff;
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reset();
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}
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@ -273,12 +273,12 @@ 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: returnValue &= _piaTimerValue >> _piaTimerShift; break;
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case 0x05: returnValue &= _piaTimerStatus; _piaTimerStatus &= ~0x40; 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 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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@ -291,13 +291,13 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
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*value = returnValue;
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}
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if(_piaTimerValue < cycle_count) {
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_piaTimerValue = 0x100 - cycle_count + _piaTimerValue;
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_piaTimerShift = 0;
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_piaTimerStatus |= 0xc0;
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}
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else
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_piaTimerValue -= cycle_count;
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if(_piaTimerValue < cycle_count) {
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_piaTimerValue = 0x100 - cycle_count + _piaTimerValue;
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_piaTimerShift = 0;
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_piaTimerStatus |= 0xc0;
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}
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else
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_piaTimerValue -= cycle_count;
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return cycle_count;
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}
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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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uint8_t _piaTimerStatus;
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uint8_t _piaTimerStatus;
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// graphics registers
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uint8_t _playfield[3], _playfieldControl;
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@ -11,7 +11,7 @@ import Cocoa
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class Atari2600Document: NSDocument, CSCathodeRayViewDelegate {
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override init() {
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super.init()
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super.init()
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// Add your subclass-specific initialization here.
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}
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@ -22,6 +22,7 @@ CRT::CRT(int cycles_per_line, int height_of_display, int number_of_buffers, ...)
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const int scanlinesVerticalRetraceTime = 10; // source: ibid
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_time_multiplier = (1000 + cycles_per_line - 1) / cycles_per_line;
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height_of_display += (height_of_display / 20); // this is the overrun area we'll use to
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// store fundamental display configuration properties
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_height_of_display = height_of_display;// + (height_of_display / 10);
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@ -105,14 +106,10 @@ CRT::SyncEvent CRT::next_vertical_sync_event(bool vsync_is_charging, int cycles_
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int proposedSyncTime = cycles_to_run_for;
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// have we overrun the maximum permitted number of horizontal syncs for this frame?
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// if (!_vretrace_counter)
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// {
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// float raster_distance = _scanSpeed.y * proposedSyncTime;
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// if(_rasterPosition.y < 1.02f && _rasterPosition.y + raster_distance >= 1.02f) {
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// proposedSyncTime = (int)(1.02f - _rasterPosition.y) / _scanSpeed.y;
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// proposedEvent = SyncEvent::StartVSync;
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// }
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// }
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if (!_vretrace_counter && _rasterPosition.y == 0xffffffff) {
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proposedSyncTime = 0;
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proposedEvent = SyncEvent::StartVSync;
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}
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// will an acceptable vertical sync be triggered?
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if (vsync_is_charging && !_vretrace_counter) {
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@ -430,7 +427,7 @@ void CRTFrameBuilder::allocate_write_area(int required_length)
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_write_x_position = _next_write_x_position;
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_write_y_position = _next_write_y_position;
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_write_target_pointer = (_write_y_position * frame.size.width) + _write_x_position;
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_write_target_pointer = (_write_y_position * frame.size.width) + _write_x_position;
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_next_write_x_position += required_length;
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frame.dirty_size.width = std::max(frame.dirty_size.width, _next_write_x_position);
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}
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