initial commit, 4.5 stable

core/math/quick_hull.h

@@ -0,0 +1,90 @@
+/**************************************************************************/
+/*  quick_hull.h                                                          */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "core/math/geometry_3d.h"
+#include "core/templates/list.h"
+
+class QuickHull {
+public:
+	struct Edge {
+		union {
+			uint32_t vertices[2];
+			uint64_t id = 0;
+		};
+
+		static uint32_t hash(const Edge &p_edge) {
+			return hash_one_uint64(p_edge.id);
+		}
+
+		bool operator<(const Edge &p_edge) const {
+			return id < p_edge.id;
+		}
+		bool operator==(const Edge &p_edge) const {
+			return id == p_edge.id;
+		}
+
+		Edge(int p_vtx_a = 0, int p_vtx_b = 0) {
+			if (p_vtx_a > p_vtx_b) {
+				SWAP(p_vtx_a, p_vtx_b);
+			}
+
+			vertices[0] = p_vtx_a;
+			vertices[1] = p_vtx_b;
+		}
+	};
+
+	struct Face {
+		Plane plane;
+		uint32_t vertices[3] = { 0 };
+		Vector<int> points_over;
+
+		bool operator<(const Face &p_face) const {
+			return points_over.size() < p_face.points_over.size();
+		}
+	};
+
+private:
+	struct FaceConnect {
+		List<Face>::Element *left = nullptr;
+		List<Face>::Element *right = nullptr;
+		FaceConnect() {}
+	};
+	struct RetFaceConnect {
+		List<Geometry3D::MeshData::Face>::Element *left = nullptr;
+		List<Geometry3D::MeshData::Face>::Element *right = nullptr;
+		RetFaceConnect() {}
+	};
+
+public:
+	static uint32_t debug_stop_after;
+	static Error build(const Vector<Vector3> &p_points, Geometry3D::MeshData &r_mesh);
+};