X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Fpolyclip.c;h=d02f645cd81540416a3725b5e264a3aeffbad73e;hb=refs%2Fheads%2Fbsp;hp=f5ef9c79b2013eed40027fd9b762ea843f376a5f;hpb=1bd8af3c3c9ec41903590d6ad24ff6313a5cc19b;p=dosdemo

diff --git a/src/polyclip.c b/src/polyclip.c
index f5ef9c7..d02f645 100644
--- a/src/polyclip.c
+++ b/src/polyclip.c
@@ -14,6 +14,7 @@ static int clip_edge_frustum(struct g3d_vertex *poly, int *vnumptr,
 		const struct g3d_vertex *v0, const struct g3d_vertex *v1, int fplane);
 static float distance_signed(float *pos, const struct cplane *plane);
 static int intersect(const struct ray *ray, const struct cplane *plane, float *t);
+static int inside_frustum_plane(const struct g3d_vertex *v, int fplane);
 
 
 int clip_poly(struct g3d_vertex *vout, int *voutnum,
@@ -47,6 +48,11 @@ int clip_frustum(struct g3d_vertex *vout, int *voutnum,
 	int edges_clipped = 0;
 	int out_vnum = 0;
 
+	if(vnum == 1) {
+		/* special case: point clipping */
+		return inside_frustum_plane(vin, fplane) ? 1 : -1;
+	}
+
 	for(i=0; i<vnum; i++) {
 		int res = clip_edge_frustum(vout, &out_vnum, vin + i, vin + (i + 1) % vnum, fplane);
 		if(res == 0) {