using UnityEngine;
[ExecuteInEditMode, ImageEffectAllowedInSceneView]
public class MonkeyPost : MonoBehaviour
{
    public Material _material;
    [Header("辉光")]
    [Range(0f, 1f)]
    public float _threshold = 0.5f;
    [Range(0f, 1f)]
    public float _intensity = 0.5f;
    [Range(0f, 3)]
    public float _soft = 1f;
    [Header("调色")]
    [Range(0f, 2f)]
    public float _brightness = 1.7f;
    [Range(0f, 2f)]
    public float _contrast = 1.05f;
    [Range(0f, 2f)]
    public float _saturation = 1.05f;
    public Color _gamma = new Color(1, 1, 1, 1);

    private int _width;
    private int _height;
    private RenderTexture _source;
    private RenderTexture _target;

#if UNITY_EDITOR
    private void Update()
    {
        Init();
    }
#endif

    private void Awake()
    {
        Init();
    }

    void OnRenderImage(RenderTexture source, RenderTexture destination)
    {
        if (_material)
        {
            int _times = 3;
            _source = source;
            _width = _source.width;
            _height = _source.height;

            _target = RenderTexture.GetTemporary(_width, _height);
            Graphics.Blit(_source, _target, _material, 3);
            _source = _target;
            RenderTexture.ReleaseTemporary(_target);

            for (int i = 0; i < _times; i++)
            {
                _width /= 2;
                _height /= 2;
                DoPost(0);
            }
            for (int i = 0; i < _times - 1; i++)
            {
                _width *= 2;
                _height *= 2;
                DoPost(1);
            }
            _material.SetTexture("_Bloom", _source);
            RenderTexture.ReleaseTemporary(_source);
            Graphics.Blit(source, destination, _material, 2);
        }
        else
        {
            Graphics.Blit(source, destination);
        }
    }

    private void DoPost(int _pass)
    {
        _material.SetFloat("_OffsetX", _soft / _width);
        _material.SetFloat("_OffsetY", _soft / _height);
        _target = RenderTexture.GetTemporary(_width, _height);
        Graphics.Blit(_source, _target, _material, _pass);
        _source = _target;
        RenderTexture.ReleaseTemporary(_target);
    }

    public void Init()
    {
        if (_material)
        {
            _material.SetFloat("_Intensity", _intensity);
            _material.SetFloat("_Threshold", _threshold);
            _material.SetFloat("_Brightness", _brightness);
            _material.SetFloat("_Contrast", _contrast);
            _material.SetFloat("_Saturation", _saturation);
            _material.SetVector("_Gamma", _gamma);
        }
    }
}