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Threw in missile repeats.

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This commit is contained in:
Thomas Harte 2015-08-19 09:46:57 -04:00
parent 28fad66272
commit c5e480cfae
1 changed files with 21 additions and 17 deletions
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38
Machines/Atari2600.cpp
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@ -70,35 +70,24 @@ void Machine::get_output_pixel(uint8_t *pixel, int offset)
uint8_t playerPixels[2] = {0, 0}, missilePixels[2] = {0, 0};
for(int c = 0; c < 2; c++)
{
const uint8_t repeatMask = _playerAndMissileSize[c]&7;
if(_playerGraphics[c])
{
// figure out player colour
int flipMask = (_playerReflection[c]&0x8) ? 0 : 7;
int relativeTimer = _objectCounter[c] - 5;
switch (_playerAndMissileSize[c]&7)
switch (repeatMask)
{
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;
default:
if (repeatMask&4 && relativeTimer >= 64) relativeTimer -= 64;
else if (repeatMask&2 && relativeTimer >= 32) relativeTimer -= 32;
else if (repeatMask&1 && relativeTimer >= 16) relativeTimer -= 16;
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;
@ -112,6 +101,21 @@ void Machine::get_output_pixel(uint8_t *pixel, int offset)
if((_missileGraphicsEnable[c]&2) && !(_missileGraphicsReset[c]&2))
{
int missileIndex = _objectCounter[2+c] - 4;
switch (repeatMask)
{
case 0: break;
default:
if (repeatMask&4 && missileIndex >= 64) missileIndex -= 64;
else if (repeatMask&2 && missileIndex >= 32) missileIndex -= 32;
else if (repeatMask&1 && missileIndex >= 16) missileIndex -= 16;
break;
case 5:
missileIndex >>= 1;
break;
case 7:
missileIndex >>= 2;
break;
}
int missileSize = 1 << ((_playerAndMissileSize[c] >> 4)&3);
missilePixels[c] = (missileIndex >= 0 && missileIndex < missileSize) ? 1 : 0;
}