using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.UI;

public class TestThreadCamera : MonoBehaviour
{
    public Camera ca;
    Texture2D screenShot;
    // Start is called before the first frame update
    void Start()
    {
        RenderTexture rt = new RenderTexture(640, 480, 0, RenderTextureFormat.ARGB32);
   
        ca.targetTexture = rt;
        screenShot = new Texture2D(ca.targetTexture.width,ca.targetTexture.height,TextureFormat.RGBA32, false);
        StartCoroutine(GetRenederFPS());
    }

    // Update is called once per frame
    void Update()
    {
        
    }

    byte[] bts;
    IEnumerator GetRenederFPS()
    {
        while (true)
        {
            var req = AsyncGPUReadback.Request(ca.targetTexture,0, TextureFormat.RGBA32);
            yield return new WaitUntil(() => req.done);
            if (!req.hasError)
            {

                if (bts == null)
                {
                    bts = new byte[req.layerDataSize];
                }
                req.GetData<byte>().CopyTo(bts);
                screenShot.LoadRawTextureData(bts);
                screenShot.Apply();
                //  tex.SetPixels32(req.GetData<Color32>().ToArray());
                this.GetComponent<RawImage>().texture = screenShot;
            }
            else
            {
                Debug.LogError("Error AsyncGPUReadbackRequest.hasError");
            }
        }
    }
}