Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-23 17:00:53 +03:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

deco_mlc - hide some unwanted gfx in stadhr96

Browse Source
This commit is contained in:
David Haywood 2013-03-16 19:20:17 +00:00
parent 5912bc6fa8
commit 156911fa6c
1 changed files with 18 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
src/mame/video/deco_mlc.c
View File

@ -165,7 +165,7 @@ void deco_mlc_state::draw_sprites( const rectangle &cliprect, int scanline, UINT
0x4000 - Y flip
0x2000 - Auto-flicker (display sprite only every other frame)
0x1000 - If set combine this 4bpp sprite & next one, into 8bpp sprite
0x0800 - ? (Not seen used anywhere)
0x0800 - This is set ingame on Stadium Hero 96, on graphics which otherwise obscure the playfield?
0x0400 - Use raster IRQ lookup table when drawing object
0x0300 - Selects clipping window to use
0x00ff - Colour/alpha shadow enable
@ -208,7 +208,15 @@ void deco_mlc_state::draw_sprites( const rectangle &cliprect, int scanline, UINT
// although it doesn't seem to set the scroll values very often either
// so the irq mechanism might be wrong
rasterMode = (mlc_spriteram[offs+1]>>10)&0x1;
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
if (unk_bit)
continue;
clipper = (mlc_spriteram[offs+1]>>8)&0x3;
@ -323,7 +331,7 @@ void deco_mlc_state::draw_sprites( const rectangle &cliprect, int scanline, UINT
if (rasterMode)
{
int irq_base_reg = 6 /* 6, 9, 12 */;
int irq_base_reg = 12 /* 6, 9, 12 */;
int extra_y_off = m_irq_ram[irq_base_reg+0] & 0x7ff;
int extra_x_off = m_irq_ram[irq_base_reg+1] & 0x7ff;
@ -332,12 +340,15 @@ void deco_mlc_state::draw_sprites( const rectangle &cliprect, int scanline, UINT
if (extra_x_off & 0x400) extra_x_off -= 0x800;
if (extra_y_off & 0x400) extra_y_off -= 0x800;
if (extra_y_scale & 0x400) extra_y_scale -= 0x800;
if (extra_x_scale & 0x400) extra_x_scale -= 0x800;
x += extra_x_off;
y += extra_x_off;
y += extra_y_off;
xscale = extra_x_scale;
yscale = extra_y_scale;
xscale += extra_x_scale;
yscale += extra_y_scale;
}
@ -382,7 +393,8 @@ void deco_mlc_state::draw_sprites( const rectangle &cliprect, int scanline, UINT
continue;
// color = machine().rand();
int srcline = ((bby<<16) / ratio);