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Made a first attempt at the sprite latches. Hopefully this should make a few more Activision logos, etc, show up correctly.

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This commit is contained in:
Thomas Harte 2015-07-30 20:52:26 -04:00
parent 20c2d98b9a
commit 1b7846f09b
2 changed files with 35 additions and 10 deletions
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19
Machines/Atari2600.cpp
View File

@ -218,8 +218,8 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
case 0x01: _vBlankEnabled = !!(*value & 0x02); break;
case 0x02: {
cycle_count += ((_horizontalTimer+4) / 3);
output_pixels(_horizontalTimer+4);
cycle_count += ((_horizontalTimer+1) / 3);
output_pixels(_horizontalTimer+1);
} break;
case 0x03: _horizontalTimer = 227; break;
@ -244,8 +244,15 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
case 0x13: _missilePosition[1] = _horizontalTimer; break;
case 0x14: _ballPosition = _horizontalTimer; break;
case 0x1b: _playerGraphics[0] = *value; break;
case 0x1c: _playerGraphics[1] = *value; break;
case 0x1b:
case 0x1c: {
int index = (address & 0x3f) - 0x1b;
_playerGraphicsLatch[index] = *value;
if(!(_playerGraphicsLatchEnable[index]&1))
_playerGraphics[index] = _playerGraphicsLatch[index];
if(_playerGraphicsLatchEnable[index^1]&1)
_playerGraphics[index^1] = _playerGraphicsLatch[index^1];
} break;
case 0x1d: _missileGraphicsEnable[0] = *value; break;
case 0x1e: _missileGraphicsEnable[1] = *value; break;
case 0x1f: _ballGraphicsEnable = *value; break;
@ -256,6 +263,10 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
case 0x23: _missileMotion[1] = *value; break;
case 0x24: _ballMotion = *value; break;
case 0x25: _playerGraphicsLatchEnable[0] = *value; break;
case 0x26: _playerGraphicsLatchEnable[1] = *value; break;
case 0x27: _ballGraphicsEnableDelay = *value; break;
case 0x2a:
_playerPosition[0] += (int8_t)_playerMotion[0] >> 4;
_playerPosition[1] += (int8_t)_playerMotion[1] >> 4;

26
Machines/Atari2600.hpp
View File

@ -39,18 +39,32 @@ class Machine: public CPU6502::Processor<Machine> {
unsigned int _piaTimerShift;
uint8_t _piaTimerStatus;
// graphics registers
// playfield registers
uint8_t _playfield[3], _playfieldControl;
uint8_t _playerColour[2];
uint8_t _playfieldColour;
uint8_t _backgroundColour;
uint8_t _playerAndMissileSize[2];
// player registers
uint8_t _playerColour[2];
uint8_t _playerReflection[2];
uint8_t _playerGraphics[2];
uint8_t _playerGraphicsLatch[2], _playerGraphics[2];
uint8_t _playerPosition[2];
uint8_t _playerMotion[2];
uint8_t _playerGraphicsLatchEnable[2];
// player + missile registers
uint8_t _playerAndMissileSize[2];
// missile registers
uint8_t _missileGraphicsEnable[2];
uint8_t _missilePosition[2];
uint8_t _missileMotion[2];
// ball registers
uint8_t _ballGraphicsEnable;
uint8_t _playerPosition[2], _missilePosition[2], _ballPosition;
uint8_t _playerMotion[2], _missileMotion[2], _ballMotion;
uint8_t _ballPosition;
uint8_t _ballMotion;
uint8_t _ballGraphicsEnableDelay;
// graphics output
int32_t _horizontalTimer;