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This should happen every fourth cycle.

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This commit is contained in:
Thomas Harte 2015-08-10 08:16:17 +01:00
parent 3c27306a8e
commit a228969655
1 changed files with 4 additions and 4 deletions
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8
Machines/Atari2600.cpp
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@ -106,14 +106,14 @@ void Machine::get_output_pixel(uint8_t *pixel, int offset)
playerPixels[c] = 0;
// figure out missile colour
int missileIndex = _missileCounter[c];
int missileIndex = _missileCounter[c] - 4;
int missileSize = 1 << ((_playerAndMissileSize[c] >> 4)&3);
missilePixels[c] = (missileIndex >= 0 && missileIndex < missileSize && (_missileGraphicsEnable[c]&2)) ? 1 : 0;
}
// get the ball proposed colour
uint8_t ballPixel;
int ballIndex = _ballCounter - 2;
int ballIndex = _ballCounter - 4;
int ballSize = 1 << ((_playfieldControl >> 4)&3);
ballPixel = (ballIndex >= 0 && ballIndex < ballSize && (_ballGraphicsEnable&2)) ? 1 : 0;
@ -144,7 +144,7 @@ void Machine::output_pixels(int count)
OutputState state;
// update hmove
if (_hMoveFlags) {
if (!(_horizontalTimer&3) && _hMoveFlags) {
if (_hMoveFlags&1) _playerCounter[0] = (_playerCounter[0]+1)%160;
if (_hMoveFlags&2) _playerCounter[1] = (_playerCounter[1]+1)%160;
if (_hMoveFlags&4) _missileCounter[0] = (_missileCounter[0]+1)%160;
@ -232,7 +232,7 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
{
uint8_t returnValue = 0xff;
int cycles_run_for = 1;
const int32_t ready_line_disable_time = horizontalTimerReload;
const int32_t ready_line_disable_time = horizontalTimerReload - 3;
if(operation == CPU6502::BusOperation::Ready) {
int32_t distance_to_end_of_ready = _horizontalTimer - ready_line_disable_time + horizontalTimerReload;