using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;

public class DisplayPointCloudByGpu : MonoBehaviour
{
    int numPoints = 60000;
    void Start()
    {
        // 1. 读取数据
        // 提前将点云存成txt文件放在Assert/StreamingAssets文件夹下，文本的每行代表一个点，由点的x，y，z，r，g，b六个float组成
        //string fileAddress = (Application.streamingAssetsPath + "/" + "test.txt");
       //FileInfo fInfo0 = new FileInfo(fileAddress);
        //Debug.Log(fileAddress);

        //string s = "";
       // StreamReader r;
        ArrayList arrayListXYZ = new ArrayList();
        ArrayList arrayListRGB = new ArrayList();

        //if (fInfo0.Exists)
        //{
        //    r = new StreamReader(fileAddress);
        //}
        //else
        //{
        //    Debug.Log("NO THIS FILE!");
        //    return;
        //}
        //// 将文本中的点云数据读入分别存到xyz数组和rgb数组中
        //while ((s = r.ReadLine()) != null)
        //{
        //    string[] words = s.Split(" "[0]);

        //    Vector3 xyz = new Vector3(float.Parse(words[0]), -float.Parse(words[1]), float.Parse(words[2]));
        //    arrayListXYZ.Add(xyz);
        //    Color colorRGB = new Color(float.Parse(words[3]) / 255.0f, float.Parse(words[4]) / 255.0f, float.Parse(words[5]) / 255.0f);
        //    arrayListRGB.Add(colorRGB);
        //    //Debug.Log(xyz.ToString() + "," + colorRGB.ToString());
        //}
        for (int j = 0; j < 100; j++)
        {
            Vector3 xyz = new Vector3(j*0.1f, 0, j*0.1f);
            arrayListXYZ.Add(xyz);
            Color colorRGB = new Color(255 / 255.0f,0 / 255.0f, 0 / 255.0f);
            arrayListRGB.Add(colorRGB);
        }


        // 2. 渲染
        int num = arrayListRGB.Count;

        int meshNum = num / numPoints;
        int leftPointsNum = num % numPoints;
        int i = 0;

        for (; i < meshNum; i++)
        {
            GameObject obj = new GameObject();
            obj.name = i.ToString();
            obj.AddComponent<MeshFilter>();
            obj.AddComponent<MeshRenderer>();
            Mesh tempMesh = new Mesh();
            CreateMesh(ref tempMesh, ref arrayListXYZ, ref arrayListRGB, i * numPoints, numPoints);
            Material material = new Material(Shader.Find("Custom/VertexColor"));
            obj.GetComponent<MeshFilter>().mesh = tempMesh;
            obj.GetComponent<MeshRenderer>().material = material;
        }
        GameObject objLeft = new GameObject();
        objLeft.name = i.ToString();
        //objLeft.transform.position = new Vector3(Random.Range(-10, 10), Random.Range(-10, 10), Random.Range(-10, 10));
        objLeft.AddComponent<MeshFilter>();
        objLeft.AddComponent<MeshRenderer>();
        Mesh tempMeshLeft = new Mesh();
        CreateMesh(ref tempMeshLeft, ref arrayListXYZ, ref arrayListRGB, i * numPoints, leftPointsNum);
        Material materialLeft = new Material(Shader.Find("Custom/VertexColor"));
        objLeft.GetComponent<MeshFilter>().mesh = tempMeshLeft;
        objLeft.GetComponent<MeshRenderer>().material = materialLeft;

    }
    void CreateMesh(ref Mesh mesh, ref ArrayList arrayListXYZ, ref ArrayList arrayListRGB, int beginIndex, int pointsNum)
    {
        Vector3[] points = new Vector3[pointsNum];
        Color[] colors = new Color[pointsNum];
        int[] indecies = new int[pointsNum];
        for (int i = 0; i < pointsNum; ++i)
        {
            points[i] = (Vector3)arrayListXYZ[beginIndex + i];
            indecies[i] = i;
            colors[i] = (Color)arrayListRGB[beginIndex + i];
        }

        mesh.vertices = points;
        mesh.colors = colors;
        mesh.SetIndices(indecies, MeshTopology.Points, 0);
    }
}