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https://github.com/TomHarte/CLK.git
synced 2024-09-07 12:54:34 +00:00
Added something of the ball counter, but without yet a working HMOVE it's prone to error.
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@ -80,21 +80,26 @@ Machine::~Machine()
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void Machine::update_upcoming_event()
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{
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unsigned int upcomingEventsPointerPlus4 = (_upcomingEventsPointer + 4)%number_of_upcoming_events;
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// grab the background now, for display in four clocks
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if(!(_horizontalTimer&3))
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{
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unsigned int offset = 4 + _horizontalTimer - (horizontalTimerPeriod - 160);
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_upcomingEvents[(_upcomingEventsPointer + 4)%number_of_upcoming_events].updates |= Event::Action::Playfield;
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_upcomingEvents[(_upcomingEventsPointer + 4)%number_of_upcoming_events].playfieldOutput = _playfield[(offset >> 2)%40];
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_upcomingEvents[upcomingEventsPointerPlus4].updates |= Event::Action::Playfield;
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_upcomingEvents[upcomingEventsPointerPlus4].playfieldOutput = _playfield[(offset >> 2)%40];
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}
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// the ball becomes visible whenever it hits zero, regardless of whether its status
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// is the result of a counter rollover or a programmatic reset
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if(!_objectCounter[4] && _ballGraphicsEnable&2)
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if(!_objectCounter[4])
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{
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_upcomingEvents[upcomingEventsPointerPlus4].updates |= Event::Action::Ball;
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}
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_objectCounter[4] = (_objectCounter[4] + 1)%160;
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// the players and missles become visible only upon overflow to zero
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// the players and missles become visible only upon overflow to zero, so schedule for
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// 5/6 clocks ahead from 159
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}
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uint8_t Machine::get_output_pixel()
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@ -105,12 +110,12 @@ uint8_t Machine::get_output_pixel()
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uint8_t playfieldColour = ((_playfieldControl&6) == 2) ? _playerColour[offset / 80] : _playfieldColour;
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// get the ball proposed colour
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// uint8_t ballPixel = 0;
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// if(_ballGraphicsEnable&2) {
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// int ballIndex = _objectCounter[4];
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// int ballSize = 1 << ((_playfieldControl >> 4)&3);
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// ballPixel = (ballIndex >= 0 && ballIndex < ballSize) ? 1 : 0;
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// }
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uint8_t ballPixel = 0;
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if(_ballGraphicsEnable&2) {
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int ballSize = 1 << ((_playfieldControl >> 4)&3);
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ballPixel = (_pixelCounters.ball < ballSize) ? 1 : 0;
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}
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_pixelCounters.ball ++;
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// get player and missile proposed pixels
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/* uint8_t playerPixels[2] = {0, 0}, missilePixels[2] = {0, 0};
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@ -196,7 +201,7 @@ uint8_t Machine::get_output_pixel()
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}*/
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// return colour
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return _playfieldOutput ? playfieldColour : _backgroundColour;
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return (_playfieldOutput | ballPixel) ? playfieldColour : _backgroundColour;
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}
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// in imputing the knowledge that all we're dealing with is the rollover from 159 to 0,
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@ -236,9 +241,9 @@ void Machine::output_pixels(unsigned int count)
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// apply any queued changes and flush the record
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if(_upcomingEvents[_upcomingEventsPointer].updates & Event::Action::Playfield)
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{
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_playfieldOutput = _upcomingEvents[_upcomingEventsPointer].playfieldOutput;
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}
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if(_upcomingEvents[_upcomingEventsPointer].updates & Event::Action::Ball)
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_pixelCounters.ball = 0;
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_upcomingEvents[_upcomingEventsPointer].updates = 0;
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// read that state
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@ -60,8 +60,8 @@ class Machine: public CPU6502::Processor<Machine> {
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struct Event {
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enum Action {
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OutputSate = 1 << 0,
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Playfield = 1 << 1,
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Playfield = 1 << 0,
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Ball = 1 << 1
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};
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unsigned int updates;
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uint8_t playfieldOutput;
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@ -70,6 +70,9 @@ class Machine: public CPU6502::Processor<Machine> {
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unsigned int _upcomingEventsPointer;
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uint8_t _playfieldOutput;
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struct {
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uint8_t ball;
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} _pixelCounters;
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// player registers
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uint8_t _playerColour[2];
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