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Minor thing: skip the internal counter stuff if we're definitely going to end up with a transparent pixel anyway for the player and missile graphics.

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This commit is contained in:
Thomas Harte 2015-08-16 11:23:46 -04:00
parent 4b5aabdd54
commit afaa86a649
1 changed files with 42 additions and 38 deletions
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80
Machines/Atari2600.cpp
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@ -64,50 +64,54 @@ void Machine::get_output_pixel(uint8_t *pixel, int offset)
uint8_t playfieldColour = ((_playfieldControl&6) == 2) ? _playerColour[offset / 80] : _playfieldColour;
// get player and missile proposed pixels
uint8_t playerPixels[2], missilePixels[2];
uint8_t playerPixels[2] = {0, 0}, missilePixels[2] = {0, 0};
for(int c = 0; c < 2; c++)
{
// figure out player colour
int flipMask = (_playerReflection[c]&0x8) ? 0 : 7;
int relativeTimer = _objectCounter[c] - 5;
switch (_playerAndMissileSize[c]&7)
if(_playerGraphics[c])
{
case 0: break;
case 1:
if (relativeTimer >= 16) relativeTimer -= 16;
break;
case 2:
if (relativeTimer >= 32) relativeTimer -= 32;
break;
case 3:
if (relativeTimer >= 32) relativeTimer -= 32;
else if (relativeTimer >= 16) relativeTimer -= 16;
break;
case 4:
if (relativeTimer >= 64) relativeTimer -= 64;
break;
case 5:
relativeTimer >>= 1;
break;
case 6:
if (relativeTimer >= 64) relativeTimer -= 64;
else if (relativeTimer >= 32) relativeTimer -= 32;
break;
case 7:
relativeTimer >>= 2;
break;
// figure out player colour
int flipMask = (_playerReflection[c]&0x8) ? 0 : 7;
int relativeTimer = _objectCounter[c] - 5;
switch (_playerAndMissileSize[c]&7)
{
case 0: break;
case 1:
if (relativeTimer >= 16) relativeTimer -= 16;
break;
case 2:
if (relativeTimer >= 32) relativeTimer -= 32;
break;
case 3:
if (relativeTimer >= 32) relativeTimer -= 32;
else if (relativeTimer >= 16) relativeTimer -= 16;
break;
case 4:
if (relativeTimer >= 64) relativeTimer -= 64;
break;
case 5:
relativeTimer >>= 1;
break;
case 6:
if (relativeTimer >= 64) relativeTimer -= 64;
else if (relativeTimer >= 32) relativeTimer -= 32;
break;
case 7:
relativeTimer >>= 2;
break;
}
if(relativeTimer >= 0 && relativeTimer < 8)
playerPixels[c] = (_playerGraphics[c] >> (relativeTimer ^ flipMask)) &1;
}
if(relativeTimer >= 0 && relativeTimer < 8)
playerPixels[c] = (_playerGraphics[c] >> (relativeTimer ^ flipMask)) &1;
else
playerPixels[c] = 0;
// figure out missile colour
int missileIndex = _objectCounter[2+c] - 4;
int missileSize = 1 << ((_playerAndMissileSize[c] >> 4)&3);
missilePixels[c] = (missileIndex >= 0 && missileIndex < missileSize && (_missileGraphicsEnable[c]&2) && !(_missileGraphicsReset[c]&2)) ? 1 : 0;
if((_missileGraphicsEnable[c]&2) && !(_missileGraphicsReset[c]&2))
{
int missileIndex = _objectCounter[2+c] - 4;
int missileSize = 1 << ((_playerAndMissileSize[c] >> 4)&3);
missilePixels[c] = (missileIndex >= 0 && missileIndex < missileSize) ? 1 : 0;
}
}
// get the ball proposed colour