Prepared for buildings spawning

modules/world/road_grid.h

@@ -272,5 +272,62 @@ public:
 	{
 		return map_sites[site].pos;
 	}
+	HashMap<int, PoolVector<Vector2> > polygon_cache_2d;
+	inline PoolVector<Vector2> get_site_polygon_2d(int site)
+	{
+		if (polygon_cache_2d.has(site))
+			return polygon_cache_2d[site];
+		int count = 0, i;
+		int psize = map_sites[site].polygon_ind.size();
+		PoolVector<Vector2> polygon;
+		polygon.resize(psize);
+		int prev = -1;
+		for (i = 0; i < psize; i++) {
+			int idx = map_sites[site].polygon_ind[i];
+			if (idx == prev)
+				continue;
+			polygon.write()[count++] = diagram_vertices[idx];
+			prev = idx;
+		}
+		polygon.resize(count);
+		polygon_cache_2d[site] = polygon;
+		return polygon;
+	}
+	HashMap<int, PoolVector<Vector3> > polygon_cache_3d;
+	inline PoolVector<Vector3> get_site_polygon_3d(int site)
+	{
+		if (polygon_cache_3d.has(site))
+			return polygon_cache_3d[site];
+		int count = 0, i;
+		int psize = map_sites[site].polygon_ind.size();
+		PoolVector<Vector3> polygon;
+		polygon.resize(psize);
+		int prev = -1;
+		for (i = 0; i < psize; i++) {
+			int idx = map_sites[site].polygon_ind[i];
+			if (idx == prev)
+				continue;
+			polygon.write()[count++] = vertices[idx];
+			prev = idx;
+		}
+		polygon.resize(count);
+		polygon_cache_3d[site] = polygon;
+		return polygon;
+	}
+	inline PoolVector<int> get_here_sites(const Vector3 &position)
+	{
+		PoolVector<int> ret;
+		int i;
+		Rect2i xpos;
+		xpos.position = Vector2i((int)position.x, (int)position.z);
+		xpos.grow(300);
+		for (i = 0; i < map_sites.size(); i++) {
+			if (xpos.intersects(map_sites[i].rect))
+				ret.push_back(i);
+			if (xpos.encloses(map_sites[i].rect))
+				ret.push_back(i);
+		}
+		return ret;
+	}
 };
 #endif