using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityGameFramework.Runtime;
using UnityEngine.AI;

/// <summary>
/// 场景 传送点
/// </summary>
public class SceneEventNearAlpha : MonoBehaviour
{
    Camera ca;
    /// <summary>
    /// 通用默认
    /// </summary>
    Material mat;
    /// <summary>
    /// 本身新的材质
    /// </summary>
    Material selfMat = null;
    MeshRenderer rend;
    bool isNear = false;
    float alpalDis = 21;
    public void Start()
    {
        ca = Camera.main;
        rend = this.GetComponent<MeshRenderer>();
        mat = rend.material;

    }

    void Update()
    {
        return;
        float dis = Vector3.Distance(this.transform.position, ca.transform.position);
        if (dis < alpalDis)
        {
            if(!isNear)
            {
                if (!selfMat)
                {
                    selfMat = new Material(mat);
                    MaterialRenderingMode.SetMaterialRenderingMode(selfMat, MaterialRenderingMode.RenderingMode.Fade);
                }
                rend.material = selfMat;
                isNear = true;
            }
            SetCmptAlpha(dis / alpalDis);
        }
        else
        {
            if (isNear)
            {
                rend.material = mat;
                isNear = false;
            }
        }
    }

    void SetCmptAlpha(float a)
    {
        selfMat.SetColor("_Color", new Color(1, 1, 1, a));//修改 Albedo 属性
    }
}

public class MaterialRenderingMode
{

    public enum RenderingMode
    {
        Opaque,
        Cutout,
        Fade,
        Transparent
    }

    //设置材质的渲染模式
    static public void SetMaterialRenderingMode(Material material, RenderingMode renderingMode)
    {
        switch (renderingMode)
        {
            case RenderingMode.Opaque:
                material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
                material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
                material.SetInt("_ZWrite", 1);
                material.DisableKeyword("_ALPHATEST_ON");
                material.DisableKeyword("_ALPHABLEND_ON");
                material.DisableKeyword("_ALPHAPREMULTIPLY_ON");
                material.renderQueue = -1;
                break;
            case RenderingMode.Cutout:
                material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
                material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
                material.SetInt("_ZWrite", 1);
                material.EnableKeyword("_ALPHATEST_ON");
                material.DisableKeyword("_ALPHABLEND_ON");
                material.DisableKeyword("_ALPHAPREMULTIPLY_ON");
                material.renderQueue = 2450;
                break;
            case RenderingMode.Fade:
                material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);
                material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
                material.SetInt("_ZWrite", 0);
                material.DisableKeyword("_ALPHATEST_ON");
                material.EnableKeyword("_ALPHABLEND_ON");
                material.DisableKeyword("_ALPHAPREMULTIPLY_ON");
                material.renderQueue = 3000;
                break;
            case RenderingMode.Transparent:
                material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
                material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
                material.SetInt("_ZWrite", 0);
                material.DisableKeyword("_ALPHATEST_ON");
                material.DisableKeyword("_ALPHABLEND_ON");
                material.EnableKeyword("_ALPHAPREMULTIPLY_ON");
                material.renderQueue = 3000;
                break;
        }
    }

}