X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=dosdemo;a=blobdiff_plain;f=src%2Fpolytmpl.h;h=f36b288a1c24470d6bc743fe8b583d23f84af151;hp=d61ac8eb21bd94546eba7fae1f320b7d72ee4219;hb=b6c89d9ffbb08c5286448de4773290f0924a420b;hpb=5029eb9f7a538dd58e1c66c0945784acac8cc58b

diff --git a/src/polytmpl.h b/src/polytmpl.h
index d61ac8e..f36b288 100644
--- a/src/polytmpl.h
+++ b/src/polytmpl.h
@@ -69,7 +69,7 @@ static uint32_t SCANEDGE(struct pvertex *v0, struct pvertex *v1, struct pvertex
 
 void POLYFILL(struct pvertex *pv, int nverts)
 {
-	int i;
+	int i, winding;
 	int topidx = 0, botidx = 0, sltop = pfill_fb.height, slbot = 0;
 	struct pvertex *left, *right;
 	uint16_t color;
@@ -93,10 +93,10 @@ void POLYFILL(struct pvertex *pv, int nverts)
 		if(pv[i].y > pv[botidx].y) botidx = i;
 	}
 
-	int winding = 0;
+	winding = 0;
 	for(i=0; i<nverts; i++) {
 		int next = NEXTIDX(i);
-		winding += (pv[next].x - pv[i].x) * (pv[next].y + pv[i].y);
+		winding += ((pv[next].x - pv[i].x) >> 4) * ((pv[next].y + pv[i].y) >> 4);
 	}
 
 	/* +1 to avoid crashing due to off-by-one rounding errors in the rasterization */
@@ -143,8 +143,10 @@ void POLYFILL(struct pvertex *pv, int nverts)
 			uint32_t res, tmp;
 
 			if(winding < 0) {
+				// clockwise
 				edge = y0 > y1 ? left : right;
 			} else {
+				// counter-clockwise
 				edge = y0 > y1 ? right : left;
 			}
 			res = SCANEDGE(pv + i, pv + next, edge);