315 lines
11 KiB
C#
315 lines
11 KiB
C#
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using UnityEngine.Rendering;
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namespace Gameplay.Vehicle.TireMark
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{
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using UnityEngine;
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public class TireMarkPanel
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{
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public GameObject rootObj;
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public RenderTexture rt;
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// TODO: 这个size可以调整
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private readonly int _textureSize = 2048;
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private Vector3 _centerPos;
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private Vector3 _halfSize;
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public TireMarkPanel(GameObject rootObj)
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{
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this.rootObj = rootObj;
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}
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public void Init()
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{
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// 创建一个空的贴图,RenderTexture
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rt = new RenderTexture(_textureSize, _textureSize, 0, RenderTextureFormat.Default);
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// 设置基础颜色为 透明
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Graphics.SetRenderTarget(rt);
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GL.Clear(true, true, Color.clear);
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Graphics.SetRenderTarget(null);
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var meshRenderer = rootObj.transform.GetChild(0).GetComponent<MeshRenderer>();
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meshRenderer.material.mainTexture = rt;
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// 获取区块大小
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var centerPos = rootObj.transform.position;
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var size = rootObj.transform.localScale;
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var halfSize = size / 2;
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_centerPos = centerPos;
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_halfSize = halfSize;
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}
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public void Dispose()
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{
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Object.Destroy(rt);
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rt = null;
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}
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private readonly Vector2[] _cachePosList = new Vector2[4];
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private readonly Vector3[] _cacheUVList = new Vector3[4];
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public void Draw(TireMarkDrawData drawData,
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CommandBuffer cmd, int debugIndex)
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{
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// 根据drawData的数据，将贴图上的像素点进行修改
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var start = drawData.start;
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var end = drawData.end;
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var width = drawData.width;
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if (drawData.needCalc)
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{
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drawData.needCalc = false;
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if (drawData.isFirst)
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{
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drawData.isFirst = false;
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// 获取绘制四边形
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var c1 = start.pos;
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var c2 = end.pos;
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var startLeft = start.rot * new Vector3(width / 2, 0, 0);
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var p1 = start.pos + startLeft;
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var p2 = start.pos - startLeft;
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var endLeft = end.rot * new Vector3(width / 2, 0, 0);
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var p3 = end.pos + endLeft;
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var p4 = end.pos - endLeft;
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// 当c1-p1 与 c2-p3相交时，将p3重置为p1
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var isIntersect = _IsLineIntersect(c1, p1, c2, p3);
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if (isIntersect)
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{
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p3 = p1;
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}
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// 当c1-p2 与 c2-p4相交时，将p4重置为p2
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isIntersect = _IsLineIntersect(c1, p2, c2, p4);
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if (isIntersect)
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{
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p4 = p2;
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}
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drawData.cacheP1 = p1;
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drawData.cacheP2 = p2;
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drawData.cacheP3 = p3;
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drawData.cacheP4 = p4;
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drawData.cacheC1 = c2;
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}
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else
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{
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var c1 = drawData.cacheC1;
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var c2 = end.pos;
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var p1 = drawData.cacheP1;
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var p2 = drawData.cacheP2;
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var endLeft = end.rot * new Vector3(width / 2, 0, 0);
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var p3 = end.pos + endLeft;
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var p4 = end.pos - endLeft;
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// 当c1-p1 与 c2-p3相交时，将p3重置为p1
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var isIntersect = _IsLineIntersect(c1, p1, c2, p3);
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if (isIntersect)
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{
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p3 = p1;
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}
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// 当c1-p2 与 c2-p4相交时，将p4重置为p2
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isIntersect = _IsLineIntersect(c1, p2, c2, p4);
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if (isIntersect)
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{
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p4 = p2;
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}
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drawData.cacheP1 = p1;
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drawData.cacheP2 = p2;
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drawData.cacheP3 = p3;
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drawData.cacheP4 = p4;
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drawData.cacheC1 = c2;
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}
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}
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// 根据四个点,计算出贴图上的uv坐标
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var pos1 = _GetTexturePos(drawData.cacheP1);
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var pos2 = _GetTexturePos(drawData.cacheP2);
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var pos3 = _GetTexturePos(drawData.cacheP3);
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var pos4 = _GetTexturePos(drawData.cacheP4);
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drawData.cacheP1 = drawData.cacheP3;
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drawData.cacheP2 = drawData.cacheP4;
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// 重排四个uv,确保uv1234是顺时针排列的
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var posList = _cachePosList;
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posList[0] = pos1;
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posList[1] = pos2;
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posList[2] = pos3;
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posList[3] = pos4;
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// _SortUV(posList);
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var isAllOut = true;
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for (int i = 0; i < posList.Length; i++)
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{
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var pos = posList[i];
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if (pos.x is > -1 and < 1 && pos.y is > -1 and < 1)
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{
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isAllOut = false;
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break;
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}
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}
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if (isAllOut)
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{
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return;
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}
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var uvList = _cacheUVList;
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var halfUVWidth = drawData.uvWidth / 2f;
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uvList[0] = new Vector3(0.5f - halfUVWidth, drawData.start.uvY % 1f, drawData.start.alpha);
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uvList[1] = new Vector3(0.5f + halfUVWidth, drawData.start.uvY % 1f, drawData.start.alpha);
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uvList[2] = new Vector3(0.5f - halfUVWidth, drawData.end.uvY % 1f, drawData.end.alpha);
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uvList[3] = new Vector3(0.5f + halfUVWidth, drawData.end.uvY % 1f, drawData.end.alpha);
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// TODO: 等待调试
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// var combieStr = "进行绘制 " + debugIndex + ":";
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// combieStr += "pos1:" + pos1 + " ";
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// combieStr += "pos2:" + pos2 + " ";
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// combieStr += "pos3:" + pos3 + " ";
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// combieStr += "pos4:" + pos4 + " ";
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// DebugUtil.LogError(combieStr);
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// 绘制四边形
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DrawQuadrilateral(cmd, rt, posList, uvList, drawData.t2d, drawData.color);
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}
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private readonly Vector3[] _cacheVertices = new Vector3[4];
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private readonly Color[] _cacheUV = new Color[4];
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private readonly Mesh _cacheMesh = new Mesh();
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private readonly int[] _cacheIndices =
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{
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0, 1,
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3, 2
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};
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private static readonly int MainTex = Shader.PropertyToID("_MainTex");
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private static readonly int MainColor = Shader.PropertyToID("_MainColor");
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private void DrawQuadrilateral(CommandBuffer cmd,
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RenderTexture targetTexture,
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Vector2[] screenPosList,
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Vector3[] uvList,
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Texture2D texture2D,
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Color color)
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{
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// 创建 CommandBuffer
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cmd.SetRenderTarget(targetTexture);
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// 设置四边形的顶点和 UV 坐标信息
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Vector3[] vertices = _cacheVertices;
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Color[] uv = _cacheUV;
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// 0 1 2 2 1 3
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vertices[0] = new Vector3(screenPosList[0].x, screenPosList[0].y, 0f);
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vertices[1] = new Vector3(screenPosList[1].x, screenPosList[1].y, 0f);
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vertices[2] = new Vector3(screenPosList[2].x, screenPosList[2].y, 0f);
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vertices[3] = new Vector3(screenPosList[3].x, screenPosList[3].y, 0f);
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uv[0] = new Color(uvList[0].x, uvList[0].y, uvList[0].z);
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uv[1] = new Color(uvList[1].x, uvList[1].y, uvList[1].z);
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uv[2] = new Color(uvList[2].x, uvList[2].y, uvList[2].z);
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uv[3] = new Color(uvList[3].x, uvList[3].y, uvList[3].z);
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// for (int i = 0; i < 4; i++)
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// {
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// // uv坐标 就是 屏幕坐标
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// vertices[i] = new Vector3(screenPosList[i].x, -screenPosList[i].y, 0f); // 将 UV 坐标映射到屏幕空间
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// }
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// TEST
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// vertices[0] = new Vector3(-0.094f, 0.289f, 0);
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// vertices[1] = new Vector3(-0.007f, 0.239f, 0);
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// vertices[2] = new Vector3(-0.181f, 0.339f, 0);
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// vertices[3] = new Vector3(-0.186f, 0.330f, 0);
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// 创建 Mesh
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var mesh = _cacheMesh;
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mesh.vertices = vertices;
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mesh.colors = uv;
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mesh.SetIndices(_cacheIndices, MeshTopology.Quads, 0);
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// 设置材质和绘制命令
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var material = TireMarkManager.instance.drawMat;
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material.SetTexture(MainTex, texture2D);
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material.SetColor(MainColor, color);
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cmd.DrawMesh(mesh, Matrix4x4.identity, material);
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}
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private void _SortUV(Vector2[] uvList)
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{
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// 重排四个uv,确保uv1234是顺时针排列的
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Vector2 center = Vector2.zero;
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for (int i = 0; i < uvList.Length; i++)
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{
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center += uvList[i];
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}
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center /= uvList.Length;
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System.Array.Sort(uvList, (a,
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b) =>
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{
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float cross = (a.x - center.x) * (b.y - center.y) - (b.x - center.x) * (a.y - center.y);
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if (cross > 0f)
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{
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return -1;
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}
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else if (cross < 0f)
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{
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return 1;
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}
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else
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{
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return 0;
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}
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});
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}
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private Vector2 _GetTexturePos(Vector3 pos)
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{
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// 根据pos和自身_bounds计算出uv坐标
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var x = (pos.x - _centerPos.x) / _halfSize.x;
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var z = (pos.z - _centerPos.z) / _halfSize.z;
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return new Vector2(x, z);
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}
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private bool _IsLineIntersect(Vector3 p1,
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Vector3 p2,
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Vector3 p3,
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Vector3 p4)
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{
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// 判断两条线段是否相交
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Vector2 A = new Vector2(p1.x, p1.z);
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Vector2 B = new Vector2(p2.x, p2.z);
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Vector2 C = new Vector2(p3.x, p3.z);
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Vector2 D = new Vector2(p4.x, p4.z);
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float denominator = (B.y - A.y) * (D.x - C.x) - (A.x - B.x) * (C.y - D.y);
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if (denominator == 0f)
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{
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return false; // 平行或共线，不相交
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}
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float numerator1 = (A.x - C.x) * (D.y - C.y) - (A.y - C.y) * (D.x - C.x);
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float numerator2 = (A.x - C.x) * (B.y - A.y) - (A.y - C.y) * (B.x - A.x);
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float t1 = numerator1 / denominator;
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float t2 = numerator2 / denominator;
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// 如果 t1 和 t2 在 0~1 之间，则两线段相交
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if (t1 >= 0f && t1 <= 1f && t2 >= 0f && t2 <= 1f)
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{
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return true;
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}
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return false;
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}
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}
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}
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