fix: support Unity 2021

Author: Whinarn

Editor/LODGeneratorHelperEditor.cs

@@ -618,12 +618,12 @@ where go.transform.IsChildOf(ourTransform)
 
             var notChildGameObjects = from go in gameObjects
                                       where !go.transform.IsChildOf(ourTransform)
-#if UNITY_2018_3 || UNITY_2018_4 || UNITY_2019 || UNITY_2020
+#if UNITY_2018_3_OR_NEWER
                                          && !PrefabUtility.IsPartOfAnyPrefab(go)
 #endif
                                       select go;
 
-#if UNITY_2018_3 || UNITY_2018_4 || UNITY_2019 || UNITY_2020
+#if UNITY_2018_3_OR_NEWER
             var prefabGameObjects = from go in gameObjects
                                     where !go.transform.IsChildOf(ourTransform) &&
                                         PrefabUtility.IsPartOfAnyPrefab(go)

Runtime/MeshCombiner.cs

@@ -1,4 +1,4 @@
-#region License
+#region License
 /*
 MIT License
 
@@ -24,10 +24,6 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */
 #endregion
 
-#if UNITY_2017_3 || UNITY_2017_4 || UNITY_2018 || UNITY_2019 || UNITY_2020
-#define UNITY_MESH_INDEXFORMAT_SUPPORT
-#endif
-
 using System.Collections.Generic;
 using System.Linq;
 using UnityEngine;
@@ -287,11 +283,7 @@ public static Mesh CombineMeshes(Mesh[] meshes, Matrix4x4[] transforms, Material
                 for (int subMeshIndex = 0; subMeshIndex < subMeshCount; subMeshIndex++)
                 {
                     var subMeshMaterial = meshMaterials[subMeshIndex];
-#if UNITY_MESH_INDEXFORMAT_SUPPORT
                     var subMeshIndices = mesh.GetTriangles(subMeshIndex, true);
-#else
-                    var subMeshIndices = mesh.GetTriangles(subMeshIndex);
-#endif
 
                     if (currentVertexCount > 0)
                     {

Runtime/MeshSimplifier.cs

@@ -37,14 +37,10 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 //https://github.com/sp4cerat/Fast-Quadric-Mesh-Simplification
 #endregion
 
-#if UNITY_2018_2 || UNITY_2018_3 || UNITY_2018_4 || UNITY_2019 || UNITY_2020
+#if UNITY_2018_2_OR_NEWER
 #define UNITY_8UV_SUPPORT
 #endif
 
-#if UNITY_2017_3 || UNITY_2017_4 || UNITY_2018 || UNITY_2019 || UNITY_2020
-#define UNITY_MESH_INDEXFORMAT_SUPPORT
-#endif
-
 using System;
 using System.Collections.Generic;
 using System.Runtime.CompilerServices;

Runtime/Utility/MeshUtils.cs

@@ -24,21 +24,14 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */
 #endregion
 
-#if UNITY_2018_2 || UNITY_2018_3 || UNITY_2018_4 || UNITY_2019 || UNITY_2020
+#if UNITY_2018_2_OR_NEWER
 #define UNITY_8UV_SUPPORT
 #endif
 
-#if UNITY_2017_3 || UNITY_2017_4 || UNITY_2018 || UNITY_2019 || UNITY_2020
-#define UNITY_MESH_INDEXFORMAT_SUPPORT
-#endif
-
 using System;
 using System.Collections.Generic;
 using UnityEngine;
-
-#if UNITY_MESH_INDEXFORMAT_SUPPORT
 using UnityEngine.Rendering;
-#endif
 
 namespace UnityMeshSimplifier
 {
@@ -117,11 +110,9 @@ public static Mesh CreateMesh(Vector3[] vertices, int[][] indices, Vector3[] nor
             var newMesh = new Mesh();
             int subMeshCount = indices.Length;
 
-#if UNITY_MESH_INDEXFORMAT_SUPPORT
             IndexFormat indexFormat;
             var indexMinMax = MeshUtils.GetSubMeshIndexMinMax(indices, out indexFormat);
             newMesh.indexFormat = indexFormat;
-#endif
 
             if (bindposes != null && bindposes.Length > 0)
             {
@@ -188,9 +179,8 @@ public static Mesh CreateMesh(Vector3[] vertices, int[][] indices, Vector3[] nor
             for (int subMeshIndex = 0; subMeshIndex < subMeshCount; subMeshIndex++)
             {
                 var subMeshTriangles = indices[subMeshIndex];
-#if UNITY_MESH_INDEXFORMAT_SUPPORT
                 var minMax = indexMinMax[subMeshIndex];
-                if (indexFormat == UnityEngine.Rendering.IndexFormat.UInt16 && minMax.y > ushort.MaxValue)
+                if (indexFormat == IndexFormat.UInt16 && minMax.y > ushort.MaxValue)
                 {
                     int baseVertex = minMax.x;
                     for (int index = 0; index < subMeshTriangles.Length; index++)
@@ -203,9 +193,6 @@ public static Mesh CreateMesh(Vector3[] vertices, int[][] indices, Vector3[] nor
                 {
                     newMesh.SetTriangles(subMeshTriangles, subMeshIndex, false, 0);
                 }
-#else
-                newMesh.SetTriangles(subMeshTriangles, subMeshIndex, false);
-#endif
             }
 
             newMesh.RecalculateBounds();
@@ -427,7 +414,6 @@ public static Vector3[] ConvertUVsTo3D(IList<Vector4> uvs)
             return uv3D;
         }
 
-#if UNITY_MESH_INDEXFORMAT_SUPPORT
         /// <summary>
         /// Returns the minimum and maximum indices for each submesh along with the needed index format.
         /// </summary>
@@ -455,7 +441,6 @@ public static Vector2Int[] GetSubMeshIndexMinMax(int[][] indices, out IndexForma
             }
             return result;
         }
-#endif
         #endregion
 
         #region Private Methods

Tests/Editor/MeshUtilsTest.cs

@@ -24,18 +24,11 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */
 #endregion
 
-#if UNITY_2017_3 || UNITY_2017_4 || UNITY_2018 || UNITY_2019 || UNITY_2020
-#define UNITY_MESH_INDEXFORMAT_SUPPORT
-#endif
-
 using System.Collections.Generic;
 using System.Linq;
 using UnityEngine;
-using NUnit.Framework;
-
-#if UNITY_MESH_INDEXFORMAT_SUPPORT
 using UnityEngine.Rendering;
-#endif
+using NUnit.Framework;
 
 namespace UnityMeshSimplifier.Editor.Tests
 {
@@ -412,10 +405,11 @@ public void ShouldGetMeshUVs()
             mesh.vertices = new Vector3[4];
             for (int i = 0; i < uvs.Length; i++)
             {
-#if UNITY_2018
-                mesh.SetUVs(i, uvs[i].ToList());
-#else
+#if UNITY_2019_3_OR_NEWER
                 mesh.SetUVs(i, uvs[i]);
+
+#else
+                mesh.SetUVs(i, uvs[i].ToList());
 #endif
             }
 
@@ -429,7 +423,6 @@ public void ShouldGetMeshUVs()
             }
         }
 
-#if UNITY_MESH_INDEXFORMAT_SUPPORT
         [Test]
         public void ShouldGetSubMeshIndexMinMax()
         {
@@ -491,7 +484,6 @@ public void ShouldGetSubMeshIndexMinMax()
             Assert.AreEqual(expectedMinMaxIndices, minMaxIndices);
             Assert.AreEqual(IndexFormat.UInt32, indexFormat);
         }
-#endif
 
         [Test]
         public void ShouldGetUsedUVComponents()