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[NES] fix sprite overlapping draw bugs regression

This commit is contained in:
zeromus 2011-06-10 03:55:34 +00:00
parent bddb0e0c3f
commit c4e37bf42c
1 changed files with 17 additions and 9 deletions
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20
BizHawk.Emulation/Consoles/Nintendo/NES/PPU.run.cs
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@ -159,7 +159,6 @@ namespace BizHawk.Emulation.Consoles.Nintendo
for (int xp = 0; xp < 8; xp++, rasterpos++)
{
//bg pos is different from raster pos due to its offsetability.
//so adjust for that here
int bgpos = rasterpos + ppur.fh;
@ -199,12 +198,15 @@ namespace BizHawk.Emulation.Consoles.Nintendo
if (!renderspritenow) continue;
//bail out if we already have a pixel from a higher priority sprite
//bail out if we already have a pixel from a higher priority sprite.
//notice that we continue looping anyway, so that we can shift down the patterns
if (havepixel) continue;
//transparent pixel bailout
if (spixel == 0) continue;
havepixel = true;
//TODO - make sure we dont trigger spritehit if the edges are masked for either BG or OBJ
//spritehit:
//1. is it sprite#0?
@ -214,19 +216,25 @@ namespace BizHawk.Emulation.Consoles.Nintendo
{
Reg2002_objhit = true;
}
havepixel = true;
bool drawsprite = true;
//priority handling
if ((oam->oam[2] & 0x20) != 0)
{
//behind background:
if ((pixel & 3) != 0) continue;
//if in front of BG:
if ((pixel & 3) != 0)
{
drawsprite = false;
}
}
if (drawsprite)
{
//bring in the palette bits and palettize
spixel |= (oam->oam[2] & 3) << 2;
//save it for use in the framebuffer
pixelcolor = PALRAM[0x10 + spixel];
}
} //rasterpos in sprite range
} //c# fixed oam ptr