ref: 5b7ebd7be30cbd89fbfd6fdeb85bd84c1ac61f86
parent: da62091c0765ca8994d558f1339dad7c2223a95e
author: aiju <devnull@localhost>
date: Wed Mar 19 05:04:25 EDT 2014
games/snes: fixed large sprite scrolling bug
--- a/sys/src/games/snes/ppu.c
+++ b/sys/src/games/snes/ppu.c
@@ -616,6 +616,14 @@
a = sp->t0 | (dy & 7) << 1;
if(dy >= 8)
a += (dy & ~7) << 6;
+ if(sp->x < 0 && (i = (-sp->x >> 3)) != 0){+ if((sp->c & 0x40) != 0)
+ a -= i << 5;
+ else
+ a += i << 5;
+ nt -= i;
+ tp->sx += i << 3;
+ }
if((sp->c & 0x40) != 0){a += sp->sx * 4;
for(i = 0; i < nt; i++){@@ -642,6 +650,11 @@
}else
over |= 0x80;
}
+ if(sp->x < 0 && (i = (-sp->x) & 7) != 0)
+ if((sp->c & 0x40) != 0)
+ *tp->ch >>= i;
+ else
+ *tp->ch <<= i;
}
reg[0x213e] = over;
}