//------------------------------------------------------------------------------------------------------------------
// Volumetric Fog & Mist
// Created by Ramiro Oliva (Kronnect)
//------------------------------------------------------------------------------------------------------------------
using UnityEngine;
using System;
using System.Collections;
using System.Collections.Generic;


namespace VolumetricFogAndMist
{

    [ExecuteInEditMode]
    [RequireComponent(typeof(Camera), typeof(VolumetricFog))]
    public class VolumetricFogPosT : MonoBehaviour, IVolumetricFogRenderComponent
    {

        public VolumetricFog fog { get; set; }
        Material copyOpaqueMat;

        void OnRenderImage(RenderTexture source, RenderTexture destination)
        {
            if (fog == null || !fog.enabled)
            {
                Graphics.Blit(source, destination);
                return;
            }

            if (fog.transparencyBlendMode == TRANSPARENT_MODE.None)
            {
                fog.DoOnRenderImage(source, destination);
            } else
            {
                RenderTextureDescriptor desc = source.descriptor;
																RenderTexture opaqueFrame = RenderTexture.GetTemporary(desc);
                if (copyOpaqueMat == null)
                {
                    copyOpaqueMat = new Material(Shader.Find("VolumetricFogAndMist/CopyOpaque"));
                }
                copyOpaqueMat.SetFloat("_BlendPower", fog.transparencyBlendPower);
                Graphics.Blit(source, destination, copyOpaqueMat, (fog.computeDepth && fog.downsampling==1) ? 1: 0);
                RenderTexture.ReleaseTemporary(opaqueFrame);
            }
        }

        public void DestroySelf()
        {
            DestroyImmediate(this);
        }

    }

}