523 lines
20 KiB
C#
523 lines
20 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using Unity.Collections;
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using Unity.Mathematics;
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using UnityEngine.Rendering.Universal.LibTessDotNet;
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using UnityEngine.U2D;
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namespace UnityEngine.Rendering.Universal
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{
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internal static class LightUtility
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{
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public static bool CheckForChange(Light2D.LightType a, ref Light2D.LightType b)
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{
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var changed = a != b;
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b = a;
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return changed;
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}
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public static bool CheckForChange(int a, ref int b)
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{
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var changed = a != b;
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b = a;
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return changed;
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}
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public static bool CheckForChange(float a, ref float b)
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{
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var changed = a != b;
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b = a;
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return changed;
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}
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public static bool CheckForChange(bool a, ref bool b)
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{
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var changed = a != b;
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b = a;
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return changed;
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}
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private enum PivotType
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{
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PivotBase,
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PivotCurve,
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PivotIntersect,
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PivotSkip,
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PivotClip
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};
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[Serializable]
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internal struct LightMeshVertex
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{
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public Vector3 position;
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public Color color;
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public Vector2 uv;
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public static readonly VertexAttributeDescriptor[] VertexLayout = new[]
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{
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new VertexAttributeDescriptor(VertexAttribute.Position, VertexAttributeFormat.Float32, 3),
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new VertexAttributeDescriptor(VertexAttribute.Color, VertexAttributeFormat.Float32, 4),
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new VertexAttributeDescriptor(VertexAttribute.TexCoord0, VertexAttributeFormat.Float32, 2),
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};
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}
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static void Tessellate(Tess tess, ElementType boundaryType, NativeArray<ushort> indices,
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NativeArray<LightMeshVertex> vertices, Color c, ref int VCount, ref int ICount)
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{
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tess.Tessellate(WindingRule.NonZero, boundaryType, 3);
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var prevCount = VCount;
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var tessIndices = tess.Elements.Select(i => i);
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var tessVertices = tess.Vertices.Select(v =>
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new LightMeshVertex() { position = new float3(v.Position.X, v.Position.Y, 0), color = c });
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foreach (var v in tessVertices)
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vertices[VCount++] = v;
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foreach (var i in tessIndices)
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indices[ICount++] = (ushort)(i + prevCount);
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}
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static bool TestPivot(List<IntPoint> path, int activePoint, long lastPoint)
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{
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for (int i = activePoint; i < path.Count; ++i)
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{
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if (path[i].N > lastPoint)
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return true;
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}
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return (path[activePoint].N == -1);
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}
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// Degenerate Pivots at the End Points.
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static List<IntPoint> DegeneratePivots(List<IntPoint> path, List<IntPoint> inPath)
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{
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List<IntPoint> degenerate = new List<IntPoint>();
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var minN = path[0].N;
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var maxN = path[0].N;
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for (int i = 1; i < path.Count; ++i)
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{
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if (path[i].N != -1)
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{
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minN = Math.Min(minN, path[i].N);
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maxN = Math.Max(maxN, path[i].N);
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}
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}
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for (long i = 0; i < minN; ++i)
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{
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IntPoint ins = path[(int)minN];
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ins.N = i;
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degenerate.Add(ins);
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}
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degenerate.AddRange(path.GetRange(0, path.Count));
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for (long i = maxN + 1; i < inPath.Count; ++i)
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{
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IntPoint ins = inPath[(int)i];
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ins.N = i;
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degenerate.Add(ins);
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}
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return degenerate;
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}
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// Ensure that we get a valid path from 0.
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static List<IntPoint> SortPivots(List<IntPoint> outPath, List<IntPoint> inPath)
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{
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List<IntPoint> sorted = new List<IntPoint>();
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var min = outPath[0].N;
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var max = outPath[0].N;
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var minIndex = 0;
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bool newMin = true;
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for (int i = 1; i < outPath.Count; ++i)
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{
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if (max > outPath[i].N && newMin && outPath[i].N != -1)
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{
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min = max = outPath[i].N;
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minIndex = i;
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newMin = false;
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}
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else if (outPath[i].N >= max)
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{
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max = outPath[i].N;
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newMin = true;
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}
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}
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sorted.AddRange(outPath.GetRange(minIndex, (outPath.Count - minIndex)));
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sorted.AddRange(outPath.GetRange(0, minIndex));
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return sorted;
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}
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// Ensure that all points eliminated due to overlaps and intersections are accounted for Tessellation.
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static List<IntPoint> FixPivots(List<IntPoint> outPath, List<IntPoint> inPath)
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{
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var path = SortPivots(outPath, inPath);
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long pivotPoint = path[0].N;
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// Connect Points for Overlaps.
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for (int i = 1; i < path.Count; ++i)
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{
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var j = (i == path.Count - 1) ? 0 : (i + 1);
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var prev = path[i - 1];
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var curr = path[i];
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var next = path[j];
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if (prev.N > curr.N)
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{
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var incr = TestPivot(path, i, pivotPoint);
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if (incr)
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{
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if (prev.N == next.N)
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curr.N = prev.N;
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else
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curr.N = (pivotPoint + 1) < inPath.Count ? (pivotPoint + 1) : 0;
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curr.D = 3;
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path[i] = curr;
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}
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}
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pivotPoint = path[i].N;
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}
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// Insert Skipped Points.
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for (int i = 1; i < path.Count - 1;)
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{
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var prev = path[i - 1];
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var curr = path[i];
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var next = path[i + 1];
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if (curr.N - prev.N > 1)
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{
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if (curr.N == next.N)
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{
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IntPoint ins = curr;
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ins.N = (ins.N - 1);
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path[i] = ins;
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}
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else
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{
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IntPoint ins = curr;
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ins.N = (ins.N - 1);
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path.Insert(i, ins);
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}
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}
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else
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{
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i++;
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}
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}
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path = DegeneratePivots(path, inPath);
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return path;
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}
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// Rough shape only used in Inspector for quick preview.
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internal static List<Vector2> GetOutlinePath(Vector3[] shapePath, float offsetDistance)
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{
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const float kClipperScale = 10000.0f;
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List<IntPoint> path = new List<IntPoint>();
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List<Vector2> output = new List<Vector2>();
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for (var i = 0; i < shapePath.Length; ++i)
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{
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var newPoint = new Vector2(shapePath[i].x, shapePath[i].y) * kClipperScale;
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path.Add(new IntPoint((System.Int64)(newPoint.x), (System.Int64)(newPoint.y)));
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}
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List<List<IntPoint>> solution = new List<List<IntPoint>>();
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ClipperOffset clipOffset = new ClipperOffset(2048.0f);
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clipOffset.AddPath(path, JoinType.jtRound, EndType.etClosedPolygon);
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clipOffset.Execute(ref solution, kClipperScale * offsetDistance, path.Count);
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if (solution.Count > 0)
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{
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for (int i = 0; i < solution[0].Count; ++i)
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output.Add(new Vector2(solution[0][i].X / kClipperScale, solution[0][i].Y / kClipperScale));
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}
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return output;
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}
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static void TransferToMesh(NativeArray<LightMeshVertex> vertices, int vertexCount, NativeArray<ushort> indices,
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int indexCount, Light2D light)
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{
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var mesh = light.lightMesh;
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mesh.SetVertexBufferParams(vertexCount, LightMeshVertex.VertexLayout);
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mesh.SetVertexBufferData(vertices, 0, 0, vertexCount);
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mesh.SetIndices(indices, 0, indexCount, MeshTopology.Triangles, 0, true);
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light.vertices = new LightMeshVertex[vertexCount];
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NativeArray<LightMeshVertex>.Copy(vertices, light.vertices, vertexCount);
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light.indices = new ushort[indexCount];
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NativeArray<ushort>.Copy(indices, light.indices, indexCount);
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}
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public static Bounds GenerateShapeMesh(Light2D light, Vector3[] shapePath, float falloffDistance)
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{
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var ix = 0;
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var vcount = 0;
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var icount = 0;
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const float kClipperScale = 10000.0f;
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var mesh = light.lightMesh;
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// todo Revisit this while we do Batching.
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var meshInteriorColor = new Color(0.0f, 0, 0, 1.0f);
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var meshExteriorColor = new Color(0.0f, 0, 0, 0.0f);
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var vertices = new NativeArray<LightMeshVertex>(shapePath.Length * 256, Allocator.Temp);
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var indices = new NativeArray<ushort>(shapePath.Length * 256, Allocator.Temp);
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// Create shape geometry
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var inputPointCount = shapePath.Length;
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var inner = new ContourVertex[inputPointCount + 1];
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for (var i = 0; i < inputPointCount; ++i)
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inner[ix++] = new ContourVertex() { Position = new Vec3() { X = shapePath[i].x, Y = shapePath[i].y, Z = 0 } };
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inner[ix++] = inner[0];
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var tess = new Tess();
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tess.AddContour(inner, ContourOrientation.CounterClockwise);
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Tessellate(tess, ElementType.Polygons, indices, vertices, meshInteriorColor, ref vcount, ref icount);
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// Create falloff geometry
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List<IntPoint> path = new List<IntPoint>();
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for (var i = 0; i < inputPointCount; ++i)
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{
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var newPoint = new Vector2(inner[i].Position.X, inner[i].Position.Y) * kClipperScale;
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var addPoint = new IntPoint((System.Int64)(newPoint.x), (System.Int64)(newPoint.y));
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addPoint.N = i; addPoint.D = -1;
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path.Add(addPoint);
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}
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var lastPointIndex = inputPointCount - 1;
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// Generate Bevels.
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List<List<IntPoint>> solution = new List<List<IntPoint>>();
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ClipperOffset clipOffset = new ClipperOffset(24.0f);
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clipOffset.AddPath(path, JoinType.jtRound, EndType.etClosedPolygon);
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clipOffset.Execute(ref solution, kClipperScale * falloffDistance, path.Count);
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if (solution.Count > 0)
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{
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// Fix path for Pivots.
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var outPath = solution[0];
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var minPath = (long)inputPointCount;
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for (int i = 0; i < outPath.Count; ++i)
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minPath = (outPath[i].N != -1) ? Math.Min(minPath, outPath[i].N) : minPath;
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var containsStart = minPath == 0;
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outPath = FixPivots(outPath, path);
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// Tessellate.
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var bIndices = new NativeArray<ushort>(icount + (outPath.Count * 6) + 6, Allocator.Temp);
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for (int i = 0; i < icount; ++i)
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bIndices[i] = indices[i];
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var bVertices = new NativeArray<LightMeshVertex>(vcount + outPath.Count + inputPointCount, Allocator.Temp);
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for (int i = 0; i < vcount; ++i)
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bVertices[i] = vertices[i];
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var innerIndices = new ushort[inputPointCount];
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// Inner Vertices. (These may or may not be part of the created path. Beware!!)
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for (int i = 0; i < inputPointCount; ++i)
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{
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bVertices[vcount++] = new LightMeshVertex()
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{
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position = new float3(inner[i].Position.X, inner[i].Position.Y, 0),
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color = meshInteriorColor
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};
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innerIndices[i] = (ushort)(vcount - 1);
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}
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var saveIndex = (ushort)vcount;
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var pathStart = saveIndex;
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var prevIndex = outPath[0].N == -1 ? 0 : outPath[0].N;
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for (int i = 0; i < outPath.Count; ++i)
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{
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var curr = outPath[i];
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var currPoint = new float2(curr.X / kClipperScale, curr.Y / kClipperScale);
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var currIndex = curr.N == -1 ? 0 : curr.N;
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bVertices[vcount++] = new LightMeshVertex()
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{
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position = new float3(currPoint.x, currPoint.y, 0),
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color = meshExteriorColor
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};
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if (prevIndex != currIndex)
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{
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bIndices[icount++] = innerIndices[prevIndex];
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bIndices[icount++] = innerIndices[currIndex];
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bIndices[icount++] = (ushort)(vcount - 1);
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}
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bIndices[icount++] = innerIndices[prevIndex];
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bIndices[icount++] = saveIndex;
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bIndices[icount++] = saveIndex = (ushort)(vcount - 1);
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prevIndex = currIndex;
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}
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// Close the Loop.
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{
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bIndices[icount++] = pathStart;
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bIndices[icount++] = innerIndices[minPath];
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bIndices[icount++] = containsStart ? innerIndices[lastPointIndex] : saveIndex;
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bIndices[icount++] = containsStart ? pathStart : saveIndex;
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bIndices[icount++] = containsStart ? saveIndex : innerIndices[minPath];
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bIndices[icount++] = containsStart ? innerIndices[lastPointIndex] : innerIndices[minPath - 1];
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}
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TransferToMesh(bVertices, vcount, bIndices, icount, light);
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}
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else
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{
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TransferToMesh(vertices, vcount, indices, icount, light);
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}
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return mesh.GetSubMesh(0).bounds;
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}
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public static Bounds GenerateParametricMesh(Light2D light, float radius, float falloffDistance, float angle, int sides)
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{
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var angleOffset = Mathf.PI / 2.0f + Mathf.Deg2Rad * angle;
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if (sides < 3)
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{
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radius = 0.70710678118654752440084436210485f * radius;
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sides = 4;
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}
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if (sides == 4)
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{
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angleOffset = Mathf.PI / 4.0f + Mathf.Deg2Rad * angle;
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}
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var vertexCount = 1 + 2 * sides;
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var indexCount = 3 * 3 * sides;
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var vertices = new NativeArray<LightMeshVertex>(vertexCount, Allocator.Temp);
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var triangles = new NativeArray<ushort>(indexCount, Allocator.Temp);
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var centerIndex = (ushort)(2 * sides);
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var mesh = light.lightMesh;
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// Only Alpha value in Color channel is ever used. May remove it or keep it for batching params in the future.
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var color = new Color(0, 0, 0, 1);
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vertices[centerIndex] = new LightMeshVertex
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{
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position = float3.zero,
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color = color
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};
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var radiansPerSide = 2 * Mathf.PI / sides;
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var min = new float3(float.MaxValue, float.MaxValue, 0);
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var max = new float3(float.MinValue, float.MinValue, 0);
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for (var i = 0; i < sides; i++)
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{
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var endAngle = (i + 1) * radiansPerSide;
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var extrudeDir = new float3(math.cos(endAngle + angleOffset), math.sin(endAngle + angleOffset), 0);
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var endPoint = radius * extrudeDir;
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var vertexIndex = (2 * i + 2) % (2 * sides);
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vertices[vertexIndex] = new LightMeshVertex
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{
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position = endPoint,
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color = new Color(extrudeDir.x, extrudeDir.y, 0, 0)
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};
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vertices[vertexIndex + 1] = new LightMeshVertex
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{
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position = endPoint,
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color = color
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};
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// Triangle 1 (Tip)
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var triangleIndex = 9 * i;
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triangles[triangleIndex] = (ushort)(vertexIndex + 1);
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triangles[triangleIndex + 1] = (ushort)(2 * i + 1);
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triangles[triangleIndex + 2] = centerIndex;
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// Triangle 2 (Upper Top Left)
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triangles[triangleIndex + 3] = (ushort)(vertexIndex);
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triangles[triangleIndex + 4] = (ushort)(2 * i);
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triangles[triangleIndex + 5] = (ushort)(2 * i + 1);
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// Triangle 2 (Bottom Top Left)
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triangles[triangleIndex + 6] = (ushort)(vertexIndex + 1);
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triangles[triangleIndex + 7] = (ushort)(vertexIndex);
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triangles[triangleIndex + 8] = (ushort)(2 * i + 1);
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min = math.min(min, endPoint + extrudeDir * falloffDistance);
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max = math.max(max, endPoint + extrudeDir * falloffDistance);
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}
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mesh.SetVertexBufferParams(vertexCount, LightMeshVertex.VertexLayout);
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mesh.SetVertexBufferData(vertices, 0, 0, vertexCount);
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mesh.SetIndices(triangles, MeshTopology.Triangles, 0, false);
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light.vertices = new LightMeshVertex[vertexCount];
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NativeArray<LightMeshVertex>.Copy(vertices, light.vertices, vertexCount);
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light.indices = new ushort[indexCount];
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NativeArray<ushort>.Copy(triangles, light.indices, indexCount);
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return new Bounds
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{
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min = min,
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max = max
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};
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}
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public static Bounds GenerateSpriteMesh(Light2D light, Sprite sprite)
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{
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var mesh = light.lightMesh;
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if (sprite == null)
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{
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mesh.Clear();
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return new Bounds(Vector3.zero, Vector3.zero);
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}
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// this needs to be called before getting UV at the line below.
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// Venky fixed it, enroute to trunk
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var uvs = sprite.uv;
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var srcVertices = sprite.GetVertexAttribute<Vector3>(VertexAttribute.Position);
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var srcUVs = sprite.GetVertexAttribute<Vector2>(VertexAttribute.TexCoord0);
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var srcIndices = sprite.GetIndices();
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var center = 0.5f * (sprite.bounds.min + sprite.bounds.max);
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var vertices = new NativeArray<LightMeshVertex>(srcIndices.Length, Allocator.Temp);
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var color = new Color(0, 0, 0, 1);
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for (var i = 0; i < srcVertices.Length; i++)
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{
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vertices[i] = new LightMeshVertex
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{
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position = new Vector3(srcVertices[i].x, srcVertices[i].y, 0),
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color = color,
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uv = srcUVs[i]
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};
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}
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mesh.SetVertexBufferParams(vertices.Length, LightMeshVertex.VertexLayout);
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mesh.SetVertexBufferData(vertices, 0, 0, vertices.Length);
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mesh.SetIndices(srcIndices, MeshTopology.Triangles, 0, true);
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|
|
|
light.vertices = new LightMeshVertex[vertices.Length];
|
|
NativeArray<LightMeshVertex>.Copy(vertices, light.vertices, vertices.Length);
|
|
light.indices = new ushort[srcIndices.Length];
|
|
NativeArray<ushort>.Copy(srcIndices, light.indices, srcIndices.Length);
|
|
|
|
return mesh.GetSubMesh(0).bounds;
|
|
}
|
|
|
|
public static int GetShapePathHash(Vector3[] path)
|
|
{
|
|
unchecked
|
|
{
|
|
int hashCode = (int)2166136261;
|
|
|
|
if (path != null)
|
|
{
|
|
foreach (var point in path)
|
|
hashCode = hashCode * 16777619 ^ point.GetHashCode();
|
|
}
|
|
else
|
|
{
|
|
hashCode = 0;
|
|
}
|
|
|
|
return hashCode;
|
|
}
|
|
}
|
|
}
|
|
}
|