textuer

2026-09-14 00:02:08 +03:00
parent 578c4a6d4f
commit c350d65592
5 changed files with 90 additions and 26 deletions
@@ -71,13 +71,23 @@ static inline com_fix_t com_pnt_max(com_pnt_t a) {
 /* TODO: Safeguard by com_fix_mul()? */
 /* Tests whether a point is lying right to a line produced by l0 and l1.
   This assumes that l0 and l1 are in clockwise order.
-   Result is positive or zero if it holds true, otherwise it's negative. */
+   Result is positive or zero if it holds true, otherwise it's negative.
+   This also produces area of a triangle! */
 static inline com_fix_t com_pnt_edge_orient(com_pnt_t l0, com_pnt_t l1,
                                            com_pnt_t p) {
  return (l0.s.x - l1.s.x) * (p.s.y - l1.s.y) -
         (l0.s.y - l1.s.y) * (p.s.x - l1.s.x);
 }

+#define com_pnt_area(m_p0, m_p1, m_p2) (com_pnt_edge_orient(m_p0, m_p1, m_p2))
+
+static inline com_vec_t com_pnt_edge_weight(com_pnt_t v0, com_pnt_t v1,
+                                            com_pnt_t v2, com_pnt_t p) {
+  return (com_vec_t){.s = {.x = com_pnt_edge_orient(v1, v2, p),
+                           .y = com_pnt_edge_orient(v2, v0, p),
+                           .z = com_pnt_edge_orient(v0, v1, p)}};
+}
+
 static inline void com_pnt_print(com_pnt_t a) {
  com_fix_print(a.a[0]);
  com_fix_print(a.a[1]);