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I am an idiot who sucks and makes bad assumptions about alpha.

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SGI are bastards who use a 9-bit-byte framebuffer, use the extra bits to store pixel coverage, and can use the coverage bits for pixel alpha.  This wont' be implemented for a good long while.
This commit is contained in:
Ryan Holtz 2008-01-07 00:27:02 +00:00
parent 6f5af260e6
commit b1081549b7
1 changed files with 12 additions and 2 deletions
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14
src/mame/video/n64.c
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@ -1932,7 +1932,12 @@ static void render_spans_32(int start, int end, int tilenum, int shade, int text
}
}
if( !alpha_out )
/* SGINUT 1/6/08: This fixes things in some games and breaks things in others.
I believe the pixels should be discarded based on the alpha
value stored in memory, but alpha and coverage are stored in
anciliary bits in the framebuffer which are not currently
emulated by MESS. */
if( /*!alpha_out*/ 1 )
{
oz = (UINT16)zb[(fb_index + x) ^ WORD_ADDR_XOR];
if (zbuffer)
@ -2235,7 +2240,12 @@ static void render_spans_16(int start, int end, int tilenum, int shade, int text
}
}
if( !alpha_out )
/* SGINUT 1/6/08: This fixes things in some games and breaks things in others.
I believe the pixels should be discarded based on the alpha
value stored in memory, but alpha and coverage are stored in
anciliary bits in the framebuffer which are not currently
emulated by MESS. */
if( /*!alpha_out*/ 1 )
{
oz = (UINT16)zb[(fb_index + x) ^ WORD_ADDR_XOR];
if (zbuffer)