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Revert "i8244: fix problem with major system overlap"

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This reverts commit 401e9f670a.
This commit is contained in:
hap 2021-02-01 20:54:09 +01:00
parent 70d2fce7d6
commit a6218ad31d
2 changed files with 14 additions and 12 deletions
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25
src/devices/video/i8244.cpp
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@ -564,24 +564,25 @@ void i8244_device::char_pixel(u8 index, int x, int y, u8 pixel, u16 color, bitma
m_control_status |= 0x80;
// TODO: much more complex on actual console (weird glitches happen)
continue;
if (colx & 0x80)
continue;
}
else
m_priority_map[px] = index;
// note: collision affects transparent pixels too
// check if we collide with an already drawn source object
if (m_vdc.s.collision & colx)
m_collision_status |= 0x80;
// check if an already drawn object would collide with us
if (m_vdc.s.collision & 0x80)
m_collision_status |= colx;
m_collision_map[px] |= 0x80;
if (pixel)
{
// check if we collide with an already drawn source object
if (m_vdc.s.collision & colx)
m_collision_status |= 0x80;
// check if an already drawn object would collide with us
if (m_vdc.s.collision & 0x80)
m_collision_status |= colx;
m_collision_map[px] |= 0x80;
bitmap.pix(y, px) = color;
}
}
}
}

1
src/mame/drivers/odyssey2.cpp
View File

@ -60,6 +60,7 @@ TODO:
(including transparent pixels) will cause glitches and instability, it can even
overwrite the VDC color and pointer registers
* gunfight: accidental usage, sometimes causes 1-frame glitches near bullet
* powerlrd: occurs at pink mountain on the right, it's not 1:1 identical on MAME
* several homebrews by Rafael: precisely placed overlap to force character
color to change to white, see for example Piggyback Planet and Mean Santa
- 8245(PAL) video timing is not 100% accurate, though vtotal and htotal should