Merged Cake and Abel branched into 2.0.3 (#131)

Co-authored-by: azyges <aaaaaa@aaa.aaa>
Co-authored-by: cake <admin@cakeandbanana.nl>
Co-authored-by: defnotken <itsdefnotken@gmail.com>
Reviewed-on: #131

LightlessSync/ThirdParty/MeshDecimator/MeshDecimation.cs

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+#region License
+/*
+MIT License
+
+Copyright(c) 2017-2018 Mattias Edlund
+
+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.
+*/
+#endregion
+
+using System;
+using MeshDecimator.Algorithms;
+
+namespace MeshDecimator
+{
+    #region Algorithm
+    /// <summary>
+    /// The decimation algorithms.
+    /// </summary>
+    public enum Algorithm
+    {
+        /// <summary>
+        /// The default algorithm.
+        /// </summary>
+        Default,
+        /// <summary>
+        /// The fast quadric mesh simplification algorithm.
+        /// </summary>
+        FastQuadricMesh
+    }
+    #endregion
+
+    /// <summary>
+    /// The mesh decimation API.
+    /// </summary>
+    public static class MeshDecimation
+    {
+        #region Public Methods
+        #region Create Algorithm
+        /// <summary>
+        /// Creates a specific decimation algorithm.
+        /// </summary>
+        /// <param name="algorithm">The desired algorithm.</param>
+        /// <returns>The decimation algorithm.</returns>
+        public static DecimationAlgorithm CreateAlgorithm(Algorithm algorithm)
+        {
+            DecimationAlgorithm alg = null;
+
+            switch (algorithm)
+            {
+                case Algorithm.Default:
+                case Algorithm.FastQuadricMesh:
+                    alg = new FastQuadricMeshSimplification();
+                    break;
+                default:
+                    throw new ArgumentException("The specified algorithm is not supported.", "algorithm");
+            }
+
+            return alg;
+        }
+        #endregion
+
+        #region Decimate Mesh
+        /// <summary>
+        /// Decimates a mesh.
+        /// </summary>
+        /// <param name="mesh">The mesh to decimate.</param>
+        /// <param name="targetTriangleCount">The target triangle count.</param>
+        /// <returns>The decimated mesh.</returns>
+        public static Mesh DecimateMesh(Mesh mesh, int targetTriangleCount)
+        {
+            return DecimateMesh(Algorithm.Default, mesh, targetTriangleCount);
+        }
+
+        /// <summary>
+        /// Decimates a mesh.
+        /// </summary>
+        /// <param name="algorithm">The desired algorithm.</param>
+        /// <param name="mesh">The mesh to decimate.</param>
+        /// <param name="targetTriangleCount">The target triangle count.</param>
+        /// <returns>The decimated mesh.</returns>
+        public static Mesh DecimateMesh(Algorithm algorithm, Mesh mesh, int targetTriangleCount)
+        {
+            if (mesh == null)
+                throw new ArgumentNullException("mesh");
+
+            var decimationAlgorithm = CreateAlgorithm(algorithm);
+            return DecimateMesh(decimationAlgorithm, mesh, targetTriangleCount);
+        }
+
+        /// <summary>
+        /// Decimates a mesh.
+        /// </summary>
+        /// <param name="algorithm">The decimation algorithm.</param>
+        /// <param name="mesh">The mesh to decimate.</param>
+        /// <param name="targetTriangleCount">The target triangle count.</param>
+        /// <returns>The decimated mesh.</returns>
+        public static Mesh DecimateMesh(DecimationAlgorithm algorithm, Mesh mesh, int targetTriangleCount)
+        {
+            if (algorithm == null)
+                throw new ArgumentNullException("algorithm");
+            else if (mesh == null)
+                throw new ArgumentNullException("mesh");
+
+            int currentTriangleCount = mesh.TriangleCount;
+            if (targetTriangleCount > currentTriangleCount)
+                targetTriangleCount = currentTriangleCount;
+            else if (targetTriangleCount < 0)
+                targetTriangleCount = 0;
+
+            algorithm.Initialize(mesh);
+            algorithm.DecimateMesh(targetTriangleCount);
+            return algorithm.ToMesh();
+        }
+        #endregion
+
+        #region Decimate Mesh Lossless
+        /// <summary>
+        /// Decimates a mesh without losing any quality.
+        /// </summary>
+        /// <param name="mesh">The mesh to decimate.</param>
+        /// <returns>The decimated mesh.</returns>
+        public static Mesh DecimateMeshLossless(Mesh mesh)
+        {
+            return DecimateMeshLossless(Algorithm.Default, mesh);
+        }
+
+        /// <summary>
+        /// Decimates a mesh without losing any quality.
+        /// </summary>
+        /// <param name="algorithm">The desired algorithm.</param>
+        /// <param name="mesh">The mesh to decimate.</param>
+        /// <returns>The decimated mesh.</returns>
+        public static Mesh DecimateMeshLossless(Algorithm algorithm, Mesh mesh)
+        {
+            if (mesh == null)
+                throw new ArgumentNullException("mesh");
+
+            var decimationAlgorithm = CreateAlgorithm(algorithm);
+            return DecimateMeshLossless(decimationAlgorithm, mesh);
+        }
+
+        /// <summary>
+        /// Decimates a mesh without losing any quality.
+        /// </summary>
+        /// <param name="algorithm">The decimation algorithm.</param>
+        /// <param name="mesh">The mesh to decimate.</param>
+        /// <returns>The decimated mesh.</returns>
+        public static Mesh DecimateMeshLossless(DecimationAlgorithm algorithm, Mesh mesh)
+        {
+            if (algorithm == null)
+                throw new ArgumentNullException("algorithm");
+            else if (mesh == null)
+                throw new ArgumentNullException("mesh");
+
+            int currentTriangleCount = mesh.TriangleCount;
+            algorithm.Initialize(mesh);
+            algorithm.DecimateMeshLossless();
+            return algorithm.ToMesh();
+        }
+        #endregion
+        #endregion
+    }
+}