fixed point drawing in 3dgfx and added new greets screen

[dosdemo] / src / polyclip.c

diff --git a/src/polyclip.c b/src/polyclip.c
index f5ef9c7..d02f645 100644 (file)
--- 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) {