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Merge pull request #5160 from cam900/bandit

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decmxc06.cpp : Fix bandit regression, Fix notes, Remove outdated comm…
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R. Belmont 2019-06-05 09:31:08 -04:00 committed by GitHub
commit cfc6dd2944
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1 changed files with 48 additions and 39 deletions
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31
src/mame/video/decmxc06.cpp
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@ -4,9 +4,15 @@
Deco MXC06 sprite generator:
used by:
madmotor.c
madmotor.cpp
dec0.cpp
stadhero.cpp
thedeep.cpp
actfancr.cpp
vaportra.cpp
dec8.cpp
Notes (dec0.c)
Notes (dec0.cpp)
Sprite data: The unknown bits seem to be unused.
@ -29,11 +35,6 @@ Notes (dec0.c)
Bit 4,5,6,7: - Colour
Byte 5: X-coords
todo:
Implement sprite/tilemap orthogonality (not strictly needed as no
games make deliberate use of it). (pdrawgfx, or rendering to bitmap for manual mixing)
*/
@ -73,8 +74,8 @@ void deco_mxc06_device::draw_sprites(screen_device &screen, bitmap_ind16 &bitmap
int flipx = data0 & 0x2000;
parentFlipY = flipy = data0 & 0x4000;
const u16 h = (1 << ((data0 & 0x1800) >> 11)); /* 1x, 2x, 4x, 8x height */
const u16 w = (1 << ((data0 & 0x0600) >> 9)); /* 1x, 2x, 4x, 8x width */
const int h = (1 << ((data0 & 0x1800) >> 11)); /* 1x, 2x, 4x, 8x height */
int w = (1 << ((data0 & 0x0600) >> 9)); /* 1x, 2x, 4x, 8x width */
int sx = data2 & 0x01ff;
int sy = data0 & 0x01ff;
@ -101,10 +102,13 @@ void deco_mxc06_device::draw_sprites(screen_device &screen, bitmap_ind16 &bitmap
continue;
}
int chainoffs = priority ? offs - ((w - 1) * 4) : offs; // or bandit breaks
for (int x = 0; x < w; x++)
{
if (chainoffs < size)
{
// maybe, birdie try appears to specify the base code for each part..
u16 code = spriteram[offs + 1] & 0x1fff;
u16 code = spriteram[chainoffs + 1] & 0x1fff;
code &= ~(h - 1);
@ -139,10 +143,15 @@ void deco_mxc06_device::draw_sprites(screen_device &screen, bitmap_ind16 &bitmap
}
}
}
}
chainoffs += 4;
}
while (w)
{
w--;
offs += inc;
if (offs == end)
return;
}
}
}