backporting...

[dosdemo] / src / polyclip.h

diff --git a/src/polyclip.h b/src/polyclip.h
index c6745e3..adee29d 100644 (file)
--- a/src/polyclip.h
+++ b/src/polyclip.h
@@ -8,7 +8,13 @@ struct cplane {
        float nx, ny, nz;
 };
 
-/* Polygon clipper
+enum {
+       CLIP_LEFT, CLIP_RIGHT,
+       CLIP_BOTTOM, CLIP_TOP,
+       CLIP_NEAR, CLIP_FAR
+};
+
+/* Generic polygon clipper
  * returns:
  *  1 -> fully inside, not clipped
  *  0 -> straddling the plane and clipped
@@ -19,4 +25,14 @@ struct cplane {
 int clip_poly(struct g3d_vertex *vout, int *voutnum,
                const struct g3d_vertex *vin, int vnum, struct cplane *plane);
 
+/* only checks if the polygon would be clipped by the plane, and classifies it
+ * as inside/outside/straddling, without actually producing a clipped polygon.
+ * return values are the same as clip_poly.
+ */
+int check_clip_poly(const struct g3d_vertex *v, int vnum, struct cplane *plane);
+
+/* Special-case frustum clipper (might be slightly faster) */
+int clip_frustum(struct g3d_vertex *vout, int *voutnum,
+               const struct g3d_vertex *vin, int vnum, int fplane);
+
 #endif /* POLYCLIP_H_ */