275 lines
10 KiB
C#
275 lines
10 KiB
C#
using System.Collections.Generic;
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using System.Runtime.CompilerServices;
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using UnityEngine;
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using UnityEngine.UI;
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#if ENABLE_BURST
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using Unity.Burst;
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using Unity.Jobs;
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using Unity.Collections;
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#endif
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namespace XericLibrary.Runtime.UIGraph
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{
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/// <summary>
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/// 线段→模型顶点生成器
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/// 核心算法：每段线生成 5 个模型顶点 + 3 个三角形
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/// </summary>
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public static class LineMeshGenerator
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{
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/// <summary>
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/// 每段线的模型顶点数
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/// </summary>
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public const int VerticesPerSegment = 5;
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/// <summary>
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/// 每段线的三角形索引数（3 个三角形 × 3 索引）
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/// </summary>
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public const int IndicesPerSegment = 9;
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/// <summary>
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/// 计算单段线段对应的 5 个模型顶点（串行 & Job 共用）
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/// </summary>
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/// <param name="input">线段生成参数</param>
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/// <param name="outputVertices">输出顶点数组，须预留 VerticesPerSegment 个位置</param>
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/// <param name="outputStart">写入 outputVertices 的起始偏移</param>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void GenerateSingleSegment(in SegmentJobInput input,
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UIVertex[] outputVertices, int outputStart = 0)
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{
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Vector2 startPos = input.start.position;
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Vector2 endPos = input.end.position;
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Vector2 dir = endPos - startPos;
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float length = dir.magnitude;
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if (length < float.Epsilon)
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{
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// 退化为零长度线段，生成空顶点
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for (int i = 0; i < VerticesPerSegment; i++)
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{
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outputVertices[outputStart + i] = new UIVertex
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{
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position = startPos,
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color = Color.clear,
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uv0 = Vector2.zero,
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uv1 = Vector2.zero,
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uv2 = Vector4.zero,
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uv3 = Vector4.zero
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};
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}
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return;
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}
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Vector2 normal = dir / length;
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Vector2 subTangent = Vector2.Perpendicular(normal);
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// 起点和终点的实际宽度（两端可不同）
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float halfW0 = input.start.thickness * 0.5f;
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float halfW1 = input.end.thickness * 0.5f;
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// 5 顶点布局
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// V0 = start + normal * -halfW (左下)
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// V1 = start + normal + halfW (左上)
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// V2 = end + normal * -halfW (右下)
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// V3 = end + normal + halfW (右上)
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// V4 = end (中心 → 转角连接)
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Vector3 v0 = startPos - subTangent * halfW0;
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Vector3 v1 = startPos + subTangent * halfW0;
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Vector3 v2 = endPos - subTangent * halfW1;
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Vector3 v3 = endPos + subTangent * halfW1;
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Vector3 v4 = endPos;
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Color32 c0 = Color32.Lerp(input.start.color, input.end.color, 0f);
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Color32 c1 = c0;
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Color32 c2 = Color32.Lerp(input.start.color, input.end.color, 1f);
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Color32 c3 = c2;
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Color32 c4 = c2;
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float uvSX = 0f;
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float uvEX = 1f;
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float uvSY = input.startLineUV;
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float uvEY = input.endLineUV;
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UIVertex vert = new UIVertex
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{
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normal = Vector3.back,
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tangent = new Vector4(1f, 0f, 0f, -1f)
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};
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Vector4 userDataStart = input.start.userData;
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Vector4 userDataEnd = input.end.userData;
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// V0
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vert.position = v0;
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vert.color = c0;
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vert.uv0 = new Vector2(uvSX, uvSY);
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vert.uv1 = new Vector2(0f, uvSY); // 整线UV (u=0 表示线的起点侧)
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vert.uv2 = userDataStart;
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vert.uv3 = Vector4.zero;
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outputVertices[outputStart + 0] = vert;
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// V1
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vert.position = v1;
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vert.color = c1;
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vert.uv0 = new Vector2(uvEX, uvSY);
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vert.uv1 = new Vector2(1f, uvSY); // 整线UV (u=1 表示线的终点侧)
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vert.uv2 = userDataStart;
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vert.uv3 = Vector4.zero;
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outputVertices[outputStart + 1] = vert;
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// V2
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vert.position = v2;
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vert.color = c2;
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vert.uv0 = new Vector2(uvSX, uvEY);
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vert.uv1 = new Vector2(0f, uvEY);
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vert.uv2 = userDataEnd;
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vert.uv3 = Vector4.zero;
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outputVertices[outputStart + 2] = vert;
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// V3
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vert.position = v3;
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vert.color = c3;
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vert.uv0 = new Vector2(uvEX, uvEY);
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vert.uv1 = new Vector2(1f, uvEY);
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vert.uv2 = userDataEnd;
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vert.uv3 = Vector4.zero;
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outputVertices[outputStart + 3] = vert;
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// V4
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vert.position = v4;
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vert.color = c4;
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vert.uv0 = new Vector2(0.5f, uvEY);
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vert.uv1 = new Vector2(0.5f, uvEY);
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vert.uv2 = userDataEnd;
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vert.uv3 = Vector4.zero;
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outputVertices[outputStart + 4] = vert;
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}
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/// <summary>
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/// 生成单段线段的三角形索引（写入 indexList）
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/// </summary>
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/// <param name="segmentIndex">子段全局索引</param>
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/// <param name="hasPrevInLine">上一子段是否属于同一条线（控制转角连接三角形）</param>
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/// <param name="indexList">输出的三角形索引列表</param>
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public static void GenerateSegmentIndices(int segmentIndex, bool hasPrevInLine, List<int> indexList)
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{
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int baseVert = segmentIndex * VerticesPerSegment;
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// 三角形 1: V0-V1-V3 (矩形上半)
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indexList.Add(baseVert + 0);
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indexList.Add(baseVert + 1);
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indexList.Add(baseVert + 3);
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// 三角形 2: V3-V2-V0 (矩形下半)
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indexList.Add(baseVert + 3);
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indexList.Add(baseVert + 2);
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indexList.Add(baseVert + 0);
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// 三角形 3: 转角连接三角形
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// 仅在「同一折线上的相邻子段」之间绘制
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// 连接上一段的 V4（上一段终点中心）到当前段的 V0, V1
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if (hasPrevInLine)
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{
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int prevV4 = (segmentIndex - 1) * VerticesPerSegment + 4;
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indexList.Add(prevV4);
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indexList.Add(baseVert + 0);
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indexList.Add(baseVert + 1);
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}
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}
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#region Jobs 模式
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#if ENABLE_BURST
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/// <summary>
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/// Burst 编译的 IJobParallelFor：并行生成各段线的模型顶点
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/// </summary>
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[BurstCompile]
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public struct GenerateVerticesJob : IJobParallelFor
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{
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[ReadOnly] public NativeArray<SegmentJobInput> Inputs;
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[WriteOnly] public NativeArray<UIVertex> OutputVertices;
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public void Execute(int index)
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{
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int start = index * VerticesPerSegment;
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var input = Inputs[index];
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Vector2 startPos = input.start.position;
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Vector2 endPos = input.end.position;
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Vector2 dir = endPos - startPos;
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float length = dir.magnitude;
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if (length < float.Epsilon)
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{
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for (int i = 0; i < VerticesPerSegment; i++)
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OutputVertices[start + i] = new UIVertex();
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return;
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}
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Vector2 normal = dir / length;
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Vector2 subTangent = new Vector2(-normal.y, normal.x);
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float halfW0 = input.start.thickness * 0.5f;
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float halfW1 = input.end.thickness * 0.5f;
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Vector3 v0 = startPos - subTangent * halfW0;
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Vector3 v1 = startPos + subTangent * halfW0;
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Vector3 v2 = endPos - subTangent * halfW1;
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Vector3 v3 = endPos + subTangent * halfW1;
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Vector3 v4 = endPos;
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Color32 c0 = Color32.Lerp(input.start.color, input.end.color, 0f);
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Color32 c2 = Color32.Lerp(input.start.color, input.end.color, 1f);
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float uvSY = input.startLineUV;
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float uvEY = input.endLineUV;
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Vector4 userDataStart = input.start.userData;
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Vector4 userDataEnd = input.end.userData;
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UIVertex vert = new UIVertex
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{
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normal = Vector3.back,
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tangent = new Vector4(1f, 0f, 0f, -1f)
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};
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vert.position = v0; vert.color = c0;
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vert.uv0 = new Vector2(0f, uvSY); vert.uv1 = new Vector2(0f, uvSY); vert.uv2 = userDataStart;
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OutputVertices[start + 0] = vert;
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vert.position = v1; vert.color = c0;
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vert.uv0 = new Vector2(1f, uvSY); vert.uv1 = new Vector2(1f, uvSY); vert.uv2 = userDataStart;
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OutputVertices[start + 1] = vert;
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vert.position = v2; vert.color = c2;
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vert.uv0 = new Vector2(0f, uvEY); vert.uv1 = new Vector2(0f, uvEY); vert.uv2 = userDataEnd;
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OutputVertices[start + 2] = vert;
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vert.position = v3; vert.color = c2;
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vert.uv0 = new Vector2(1f, uvEY); vert.uv1 = new Vector2(1f, uvEY); vert.uv2 = userDataEnd;
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OutputVertices[start + 3] = vert;
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vert.position = v4; vert.color = c2;
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vert.uv0 = new Vector2(0.5f, uvEY); vert.uv1 = new Vector2(0.5f, uvEY); vert.uv2 = userDataEnd;
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OutputVertices[start + 4] = vert;
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}
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}
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/// <summary>
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/// 使用 Jobs 并行生成线段顶点
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/// </summary>
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public static JobHandle GenerateSegmentsJobs(
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NativeArray<SegmentJobInput> inputs,
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NativeArray<UIVertex> outputVertices,
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JobHandle dependsOn = default)
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{
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var job = new GenerateVerticesJob
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{
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Inputs = inputs,
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OutputVertices = outputVertices
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};
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return job.Schedule(inputs.Length, 1, dependsOn);
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}
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#endif
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#endregion
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}
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}
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