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Counters run every scan line regardless of blank and sync. Also played further with timing.

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This commit is contained in:
Thomas Harte 2016-05-21 12:54:39 -04:00
parent 470c90428a
commit b1c84f5402
1 changed files with 15 additions and 10 deletions
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25
Machines/Atari2600/Atari2600.cpp
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@ -79,6 +79,9 @@ Machine::~Machine()
void Machine::update_timers(int mask)
{
unsigned int upcomingEventsPointerPlus1 = (_upcomingEventsPointer + 1)%number_of_upcoming_events;
unsigned int upcomingEventsPointerPlus2 = (_upcomingEventsPointer + 2)%number_of_upcoming_events;
unsigned int upcomingEventsPointerPlus3 = (_upcomingEventsPointer + 3)%number_of_upcoming_events;
unsigned int upcomingEventsPointerPlus4 = (_upcomingEventsPointer + 4)%number_of_upcoming_events;
unsigned int upcomingEventsPointerPlus5 = (_upcomingEventsPointer + 5)%number_of_upcoming_events;
unsigned int upcomingEventsPointerPlus6 = (_upcomingEventsPointer + 6)%number_of_upcoming_events;
@ -91,8 +94,8 @@ void Machine::update_timers(int mask)
if(!(_horizontalTimer&3))
{
unsigned int offset = 4 + _horizontalTimer - (horizontalTimerPeriod - 160);
_upcomingEvents[upcomingEventsPointerPlus4].updates |= Event::Action::Playfield;
_upcomingEvents[upcomingEventsPointerPlus4].playfieldOutput = _playfield[(offset >> 2)%40];
_upcomingEvents[upcomingEventsPointerPlus2].updates |= Event::Action::Playfield;
_upcomingEvents[upcomingEventsPointerPlus2].playfieldOutput = _playfield[(offset >> 2)%40];
}
}
@ -102,8 +105,8 @@ void Machine::update_timers(int mask)
{
if(!_objectCounter[4])
{
_upcomingEvents[upcomingEventsPointerPlus4].updates |= Event::Action::ResetPixelCounter;
_upcomingEvents[upcomingEventsPointerPlus4].pixelCounterMask |= (1 << 4);
_upcomingEvents[upcomingEventsPointerPlus2].updates |= Event::Action::ResetPixelCounter;
_upcomingEvents[upcomingEventsPointerPlus2].pixelCounterMask |= (1 << 4);
}
_objectCounter[4] = (_objectCounter[4] + 1)%160;
_pixelCounter[4] ++;
@ -118,7 +121,8 @@ void Machine::update_timers(int mask)
// 5/6 clocks ahead from 159
if(_objectCounter[c] == 159)
{
unsigned int actionSlot = (c < 2) ? upcomingEventsPointerPlus6 : upcomingEventsPointerPlus5;
unsigned int actionSlot = (c < 2) ? upcomingEventsPointerPlus4 : upcomingEventsPointerPlus3;
// unsigned int actionSlot = (c < 2) ? upcomingEventsPointerPlus6 : upcomingEventsPointerPlus5;
_upcomingEvents[actionSlot].updates |= Event::Action::ResetPixelCounter;
_upcomingEvents[actionSlot].pixelCounterMask |= (1 << c);
}
@ -133,7 +137,8 @@ void Machine::update_timers(int mask)
( _objectCounter[c] == 64 && ((repeatMask == 4) || (repeatMask == 6)) )
)
{
unsigned int actionSlot = (c < 2) ? upcomingEventsPointerPlus5 : upcomingEventsPointerPlus4;
unsigned int actionSlot = (c < 2) ? upcomingEventsPointerPlus3 : upcomingEventsPointerPlus2;
// unsigned int actionSlot = (c < 2) ? upcomingEventsPointerPlus5 : upcomingEventsPointerPlus4;
_upcomingEvents[actionSlot].updates |= Event::Action::ResetPixelCounter;
_upcomingEvents[actionSlot].pixelCounterMask |= (1 << c);
}
@ -257,6 +262,10 @@ void Machine::output_pixels(unsigned int count)
default: state = OutputState::Pixel; break;
}
// grab background colour and schedule pixel counter resets
if(state == OutputState::Pixel)
update_timers(~0);
// if vsync is enabled, output the opposite of the automatic hsync output
if(_vSyncEnabled) {
state = (state = OutputState::Sync) ? OutputState::Blank : OutputState::Sync;
@ -265,10 +274,6 @@ void Machine::output_pixels(unsigned int count)
// write that state as the one that will become effective in four clocks
_upcomingEvents[(_upcomingEventsPointer+4)%number_of_upcoming_events].state = state;
// grab background colour and schedule pixel counter resets
if(state == OutputState::Pixel)
update_timers(~0);
// apply any queued changes and flush the record
if(_upcomingEvents[_upcomingEventsPointer].updates & Event::Action::Playfield)
_playfieldOutput = _upcomingEvents[_upcomingEventsPointer].playfieldOutput;