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Rethought, hopefully perfecting, sprite timing.

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This commit is contained in:
Thomas Harte 2016-05-30 19:56:36 -04:00
parent 8b342f77a9
commit 3fc80ea01f
2 changed files with 20 additions and 21 deletions
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33
Machines/Atari2600/Atari2600.cpp
View File

@ -110,10 +110,6 @@ void Machine::update_timers(int mask)
_objectCounterPointer = (_objectCounterPointer + 1)%number_of_recorded_counters;
ObjectCounter *oneClockAgo = _objectCounter[(_objectCounterPointer - 1 + number_of_recorded_counters)%number_of_recorded_counters];
ObjectCounter *twoClocksAgo = _objectCounter[(_objectCounterPointer - 2 + number_of_recorded_counters)%number_of_recorded_counters];
// ObjectCounter *threeClocksAgo = _objectCounter[(_objectCounterPointer - 3 + number_of_recorded_counters)%number_of_recorded_counters];
// ObjectCounter *fourClocksAgo = _objectCounter[(_objectCounterPointer - 4 + number_of_recorded_counters)%number_of_recorded_counters];
// ObjectCounter *fiveClocksAgo = _objectCounter[(_objectCounterPointer - 5 + number_of_recorded_counters)%number_of_recorded_counters];
// ObjectCounter *sixClocksAgo = _objectCounter[(_objectCounterPointer - 6 + number_of_recorded_counters)%number_of_recorded_counters];
ObjectCounter *now = _objectCounter[_objectCounterPointer];
// grab the background now, for application in four clocks
@ -325,6 +321,13 @@ void Machine::output_pixels(unsigned int count)
{
update_timers(_hMoveFlags);
}
if(_upcomingEvents[_upcomingEventsPointer].updates & Event::Action::ResetCounter)
{
_objectCounter[_objectCounterPointer][_upcomingEvents[_upcomingEventsPointer].counter].count = 0;
}
// zero out current update event, progress to next
_upcomingEvents[_upcomingEventsPointer].updates = 0;
_upcomingEventsPointer = (_upcomingEventsPointer + 1)%number_of_upcoming_events;
@ -342,13 +345,11 @@ void Machine::output_pixels(unsigned int count)
_nextPlayfieldOutput = _playfield[(_horizontalTimer - 64) >> 2];
}
// if vsync is enabled, output the opposite of the automatic hsync output
// if vsync is enabled, output the opposite of the automatic hsync output;
// also honour the vertical blank flag
if(_vSyncEnabled) {
effective_state = (effective_state = OutputState::Sync) ? OutputState::Blank : OutputState::Sync;
}
// honour the vertical blank flag
if(_vBlankEnabled && effective_state == OutputState::Pixel) {
} else if(_vBlankEnabled && effective_state == OutputState::Pixel) {
effective_state = OutputState::Blank;
}
@ -388,7 +389,6 @@ void Machine::output_pixels(unsigned int count)
{
_stateByTime = _stateByExtendTime[0];
set_ready_line(false);
// printf("\n");
}
}
}
@ -409,7 +409,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
cycles_run_for = distance_to_end_of_ready;
}
output_pixels(2);
output_pixels(cycles_run_for);
if(operation != CPU6502::BusOperation::Ready) {
@ -485,10 +485,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
case 0x01: _vBlankEnabled = !!(*value & 0x02); break;
case 0x02:
// printf("%d\n", _horizontalTimer);
// printf("W");
// if(_horizontalTimer)
set_ready_line(true);
if(_horizontalTimer) set_ready_line(true);
break;
case 0x03:
// Reset is delayed by four cycles.
@ -576,7 +573,8 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
case 0x10: case 0x11: case 0x12: case 0x13:
case 0x14:
_objectCounter[_objectCounterPointer][decodedAddress - 0x10].count = 0;
_upcomingEvents[(_upcomingEventsPointer + 4)%number_of_upcoming_events].updates |= Event::Action::ResetCounter;
_upcomingEvents[(_upcomingEventsPointer + 4)%number_of_upcoming_events].counter = decodedAddress - 0x10;
break;
case 0x1c:
@ -607,6 +605,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
case 0x28:
case 0x29:
{
// TODO: this should properly mean setting a flag and propagating later, I think?
int index = decodedAddress - 0x28;
if(!(*value&0x02) && _missileGraphicsReset[index])
{
@ -705,8 +704,6 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
_piaTimerStatus |= 0xc0;
}
output_pixels(cycles_run_for - 2);
return cycles_run_for / 3;
}

8
Machines/Atari2600/Atari2600.hpp
View File

@ -65,15 +65,17 @@ class Machine: public CPU6502::Processor<Machine> {
struct Event {
enum Action {
Playfield = 1 << 0,
ResetCounter = 1 << 1,
HMoveSetup = 1 << 1,
HMoveCompare = 1 << 2,
HMoveDecrement = 1 << 3,
HMoveSetup = 1 << 2,
HMoveCompare = 1 << 3,
HMoveDecrement = 1 << 4,
};
int updates;
OutputState state;
uint8_t playfieldPixel;
int counter;
Event() : updates(0), playfieldPixel(0) {}
} _upcomingEvents[number_of_upcoming_events];