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deco_mlc - notes

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David Haywood 2013-03-16 22:02:12 +00:00
parent 3018feb50f
commit 1af4fda9ef
1 changed files with 7 additions and 0 deletions
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7
src/mame/video/deco_mlc.c
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@ -207,6 +207,11 @@ void deco_mlc_state::draw_sprites( const rectangle &cliprect, int scanline, UINT
// between them? furthermore avengrgs doesn't even enable this
// although it doesn't seem to set the scroll values very often either
// so the irq mechanism might be wrong
//
// actually avengrgs has our current clipper&1 set on the areas that should
// have the scroll effect applied to them. all clip windows are the same
// so there is no reason to select a clip window other than to be using it
// to select a set of raster-set scroll regs?
rasterMode = (mlc_spriteram[offs+1]>>10)&0x1;
@ -214,6 +219,8 @@ void deco_mlc_state::draw_sprites( const rectangle &cliprect, int scanline, UINT
int unk_bit = (mlc_spriteram[offs+1]>>10)&0x2;
// just bail if this bit is set, although it might be clip window related and enable a clip window
// to hide all the sprites it covers
// this seem realistic because 2 of the upper 4 'clip windows' are usually set to invalid (off-screen)
// areas, and we currently have no bit to select them.
if (unk_bit)
continue;