using Thousandto.Launcher.ExternalLibs;
using UnityEngine;

namespace AmplifyBloom
{
    //用于区分效果处理的脚本,需要挂在摄像机上
    public class CheckAmpilfyBloom: MonoBehaviour
    {
        public AmplifyBloomBase BloomComponent;

        public Shader AddTextureShader;

        private RenderTexture _rt;
        private Material _mat;

        private void InitMaterial(int rtW, int rtH, RenderTextureFormat format)
        {
            if (_rt == null)
            {
                _rt = RenderTexture.GetTemporary(rtW, rtH, 16, format);
                _rt.antiAliasing = 1;
                _rt.name = "RenderTexture3";
            }
            if (_mat == null)
            {
                if(AddTextureShader == null) AddTextureShader = ShaderFactory.Find("Hidden/Ares/Amplify/AddTexture");
                if (AddTextureShader != null)
                {
                    _mat = new Material(AddTextureShader);
                    _mat.SetTexture("_EffectTex", _rt);
                }
                else
                {
                    Debug.LogError("没有找到Shader::Hidden/Ares/Amplify/AddTexture");
                }
            }           
        }

        private void OnEnable()
        {
            if (BloomComponent != null)
            {
                BloomComponent.gameObject.SetActive(true);
            }
        }

        private void OnDisable()
        {
            if (BloomComponent != null)
            {
                BloomComponent.TargetTexture = null;
                BloomComponent.gameObject.SetActive(false);
            }

            if (_rt != null)
            {
                RenderTexture.ReleaseTemporary(_rt);
                _rt = null;
            }

            if (_mat != null)
            {
                Destroy(_mat);                
                _mat = null;
            }

          
        }

        private void OnRenderImage(RenderTexture source, RenderTexture destination)
        {
            if (BloomComponent != null)
            {
                if (_rt == null)
                {
                    InitMaterial(source.width, source.height, source.format);
                }

                if (_rt != null)
                {
                    BloomComponent.TargetTexture = _rt;
                }

                if (_mat != null)
                {
                    Graphics.Blit(source, destination, _mat);
                }
            }
            else
            {
                Graphics.Blit(source, destination);
            }
        }

    }
}