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Switched to two-register implementation of VDELP, etc.

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This commit is contained in:
Thomas Harte 2016-05-21 10:26:27 -04:00
parent 36d19cb6cf
commit 470c90428a
2 changed files with 7 additions and 9 deletions
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12
Machines/Atari2600/Atari2600.cpp
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@ -191,7 +191,7 @@ uint8_t Machine::get_output_pixel()
// figure out player colour
int flipMask = (_playerReflection[c]&0x8) ? 0 : 7;
if(_pixelCounter[c] < 32)
playerPixels[c] = (_playerGraphics[c] >> ((_pixelCounter[c] >> 2) ^ flipMask)) &1;
playerPixels[c] = (_playerGraphics[_playerGraphicsSelector[c]][c] >> ((_pixelCounter[c] >> 2) ^ flipMask)) &1;
}
if((_missileGraphicsEnable[c]&2) && !(_missileGraphicsReset[c]&2)) {
@ -535,10 +535,8 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
_ballGraphicsEnable = _ballGraphicsEnableLatch;
case 0x1b: {
int index = decodedAddress - 0x1b;
_playerGraphicsLatch[index] = *value;
if(!(_playerGraphicsLatchEnable[index]&1))
_playerGraphics[index] = _playerGraphicsLatch[index];
_playerGraphics[index^1] = _playerGraphicsLatch[index^1];
_playerGraphics[0][index] = *value;
_playerGraphics[1][index^1] = _playerGraphics[0][index^1];
} break;
case 0x1d: _missileGraphicsEnable[0] = *value; break;
case 0x1e: _missileGraphicsEnable[1] = *value; break;
@ -556,8 +554,8 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
_objectMotion[decodedAddress - 0x20] = *value;
break;
case 0x25: _playerGraphicsLatchEnable[0] = *value; break;
case 0x26: _playerGraphicsLatchEnable[1] = *value; break;
case 0x25: _playerGraphicsSelector[0] = (*value)&1; break;
case 0x26: _playerGraphicsSelector[1] = (*value)&1; break;
case 0x27: _ballGraphicsEnableDelay = *value; break;
case 0x28:

4
Machines/Atari2600/Atari2600.hpp
View File

@ -80,8 +80,8 @@ class Machine: public CPU6502::Processor<Machine> {
// player registers
uint8_t _playerColour[2];
uint8_t _playerReflection[2];
uint8_t _playerGraphicsLatch[2], _playerGraphics[2];
uint8_t _playerGraphicsLatchEnable[2];
uint8_t _playerGraphics[2][2];
uint8_t _playerGraphicsSelector[2];
bool _playerStart[2];
// player + missile registers