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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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This commit is contained in:
Thomas Harte 2015-07-30 17:16:49 -04:00
parent 14adcd2096
commit 98efae2536
4 changed files with 19 additions and 22 deletions
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22
Machines/Atari2600.cpp
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@ -20,7 +20,7 @@ Machine::Machine()
_lastOutputStateDuration = 0;
_lastOutputState = OutputState::Sync;
_crt = new Outputs::CRT(228, 256, 1, 4);
_piaTimerStatus = 0xff;
_piaTimerStatus = 0xff;
reset();
}
@ -273,12 +273,12 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
if ((address&0x1280) == 0x280) {
if(isReadOperation(operation)) {
switch(address & 0xf) {
case 0x04: returnValue &= _piaTimerValue >> _piaTimerShift; break;
case 0x05: returnValue &= _piaTimerStatus; _piaTimerStatus &= ~0x40; break;
case 0x04: returnValue &= _piaTimerValue >> _piaTimerShift; break;
case 0x05: returnValue &= _piaTimerStatus; _piaTimerStatus &= ~0x40; break;
}
} else {
switch(address & 0x0f) {
case 0x04: _piaTimerShift = 0; _piaTimerValue = *value << 0; _piaTimerStatus &= ~0xc0; break;
case 0x04: _piaTimerShift = 0; _piaTimerValue = *value << 0; _piaTimerStatus &= ~0xc0; break;
case 0x05: _piaTimerShift = 3; _piaTimerValue = *value << 3; _piaTimerStatus &= ~0xc0; break;
case 0x06: _piaTimerShift = 6; _piaTimerValue = *value << 6; _piaTimerStatus &= ~0xc0; break;
case 0x07: _piaTimerShift = 10; _piaTimerValue = *value << 10; _piaTimerStatus &= ~0xc0; break;
@ -291,13 +291,13 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
*value = returnValue;
}
if(_piaTimerValue < cycle_count) {
_piaTimerValue = 0x100 - cycle_count + _piaTimerValue;
_piaTimerShift = 0;
_piaTimerStatus |= 0xc0;
}
else
_piaTimerValue -= cycle_count;
if(_piaTimerValue < cycle_count) {
_piaTimerValue = 0x100 - cycle_count + _piaTimerValue;
_piaTimerShift = 0;
_piaTimerStatus |= 0xc0;
}
else
_piaTimerValue -= cycle_count;
return cycle_count;
}

2
Machines/Atari2600.hpp
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@ -37,7 +37,7 @@ class Machine: public CPU6502::Processor<Machine> {
// the timer
unsigned int _piaTimerValue;
unsigned int _piaTimerShift;
uint8_t _piaTimerStatus;
uint8_t _piaTimerStatus;
// graphics registers
uint8_t _playfield[3], _playfieldControl;

2
OSBindings/Mac/Clock Signal/Atari2600Document.swift
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@ -11,7 +11,7 @@ import Cocoa
class Atari2600Document: NSDocument, CSCathodeRayViewDelegate {
override init() {
super.init()
super.init()
// Add your subclass-specific initialization here.
}

15
Outputs/CRT.cpp
View File

@ -22,6 +22,7 @@ CRT::CRT(int cycles_per_line, int height_of_display, int number_of_buffers, ...)
const int scanlinesVerticalRetraceTime = 10; // source: ibid
_time_multiplier = (1000 + cycles_per_line - 1) / cycles_per_line;
height_of_display += (height_of_display / 20); // this is the overrun area we'll use to
// store fundamental display configuration properties
_height_of_display = height_of_display;// + (height_of_display / 10);
@ -105,14 +106,10 @@ CRT::SyncEvent CRT::next_vertical_sync_event(bool vsync_is_charging, int cycles_
int proposedSyncTime = cycles_to_run_for;
// have we overrun the maximum permitted number of horizontal syncs for this frame?
// if (!_vretrace_counter)
// {
// float raster_distance = _scanSpeed.y * proposedSyncTime;
// if(_rasterPosition.y < 1.02f && _rasterPosition.y + raster_distance >= 1.02f) {
// proposedSyncTime = (int)(1.02f - _rasterPosition.y) / _scanSpeed.y;
// proposedEvent = SyncEvent::StartVSync;
// }
// }
if (!_vretrace_counter && _rasterPosition.y == 0xffffffff) {
proposedSyncTime = 0;
proposedEvent = SyncEvent::StartVSync;
}
// will an acceptable vertical sync be triggered?
if (vsync_is_charging && !_vretrace_counter) {
@ -430,7 +427,7 @@ void CRTFrameBuilder::allocate_write_area(int required_length)
_write_x_position = _next_write_x_position;
_write_y_position = _next_write_y_position;
_write_target_pointer = (_write_y_position * frame.size.width) + _write_x_position;
_write_target_pointer = (_write_y_position * frame.size.width) + _write_x_position;
_next_write_x_position += required_length;
frame.dirty_size.width = std::max(frame.dirty_size.width, _next_write_x_position);
}