restrict auto-aim to 90 degrees

src/geometry.c

@@ -47,6 +47,18 @@ vec2 vec_rotate_m30(vec2 v)
                    -v.x / 2 + fmul(fix(0.866), v.y) };
 }
 
+vec2 vec_rotate_45(vec2 v)
+{
+    return (vec2){ fmul(fix(0.707), v.x) - fmul(fix(0.707), v.y),
+                   fmul(fix(0.707), v.x) + fmul(fix(0.707), v.y) };
+}
+
+vec2 vec_rotate_m45(vec2 v)
+{
+    return (vec2){ fmul(fix(0.707), v.x) + fmul(fix(0.707), v.y),
+                   -fmul(fix(0.707), v.x) + fmul(fix(0.707), v.y) };
+}
+
 //---
 // Rect operations
 //---

src/geometry.h

@@ -58,10 +58,11 @@ irect rect_f2i(rect);
 /* Dot product. */
 fixed_t vec_dot(vec2, vec2);
 
-/* Rotate a vector by 30° */
+/* Rotate a vector by some constants */
 vec2 vec_rotate_30(vec2);
-/* Rotate a vector by -30° */
 vec2 vec_rotate_m30(vec2);
+vec2 vec_rotate_45(vec2);
+vec2 vec_rotate_m45(vec2);
 
 //---
 // Point operations

src/pathfinding.c

@@ -344,14 +344,16 @@ vec2 pathfinding_autoaim(game_t const *game, entity_t *src, map_t const *map)
             continue;
 
         vec2 relpos = { p->x - src_pos.x, p->y - src_pos.y };
-        if(vec_dot(relpos, vec_rotate_30(src_facing)) < 0)
+        if(vec_dot(relpos, vec_rotate_45(src_facing)) < 0)
             continue;
-        if(vec_dot(relpos, vec_rotate_m30(src_facing)) < 0)
+        if(vec_dot(relpos, vec_rotate_m45(src_facing)) < 0)
             continue;
 
         fixed_t dist2 = fmul(relpos.x, relpos.x) + fmul(relpos.y, relpos.y);
         if(dist2 < best_dist2 || best_dist2 < 0) {
             /* TODO: Prune based on raycasts */
+            (void)map;
+
             best_dist2 = dist2;
             current_best_dir = fnormalize(relpos);
         }