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

[RequireComponent(typeof(Camera))]
public class RadiusBlur : MonoBehaviour
{
    static int radius_blur_dataId = Shader.PropertyToID("_RadiusData") ;
    static int radius_blur_iterationId = Shader.PropertyToID("_RadiusIterationData") ;

    [SerializeField]
    public Material radius_material;

    [SerializeField]
    public int iteration{
        get{
            if(radius_material != null)
            {
                return (int)radius_material.GetVector(radius_blur_iterationId).x;
            }
            return 1;
        }
        set{
            if(radius_material != null)
            {
                float invIteration = 1.0f / value;
                radius_material.SetVector(radius_blur_iterationId, new Vector2(value, invIteration));
            }
        }
    }

    [SerializeField]
    public Vector3 radius_data{
        get{
            if(radius_material != null)
            {
                return radius_material.GetVector(radius_blur_dataId);
            }
            return new Vector3(0.5f, 0.5f, 0.01f);
        }
        set{
            if(radius_material != null)
            {
                radius_material.SetVector(radius_blur_dataId, value);
            }
        }
    }


    static int RADIUS_BLUR_PASS = 0;
    private void Awake() {
        if(radius_material != null)
        {
            radius_data = radius_material.GetVector(radius_blur_dataId);
            iteration = (int)radius_material.GetVector(radius_blur_iterationId).x;
        }
    }

    private void OnRenderImage(RenderTexture src, RenderTexture dest) {
        if(radius_material)
        {
            Graphics.Blit(src, dest, radius_material, RADIUS_BLUR_PASS);
        }
        else
        {
            Graphics.Blit(src, dest);
        }
    }
}