using UnityEngine;

public class ClickEffect : MonoBehaviour {
        Vector3 point;
        GameObject effectGo;

    void Start () {
          effectGo = Resources.Load<GameObject>("Prefabs/EffectClick");
    }

    void Update () {
      //点击鼠标特效
        if (Input.GetMouseButtonDown(0))
        {
            point = new Vector3(Input.mousePosition.x,Input.mousePosition.y,4f);//获得鼠标点击点
            point = Camera.main.ScreenToWorldPoint(point);//从屏幕空间转换到世界空间
            GameObject go = Instantiate(effectGo);//生成特效
            go.transform.position = point;
            Destroy(go, 0.5f);
        }
    }
}

Shader "Unlit/ClickEffect"// Shader中的位置这个最后一个名字要和你创的Shader名字一样
{
    Properties
    {
        _MainTex("Base (RGB)", 2D) = "white" {}
    }

        CGINCLUDE
#include "UnityCG.cginc"
    uniform sampler2D _MainTex;
    float4 _MainTex_TexelSize;
    uniform float _distanceFactor;  //距离系数
    uniform float _timeFactor;      //时间系数
    uniform float _totalFactor;     //sin函数结果系数

    uniform float _waveWidth;       //波纹宽度
    uniform float _curWaveDis;      //扩散速度
    uniform float4 _startPos;       //开始位置

    fixed4 frag(v2f_img i) : SV_Target
    {
        //DX下纹理坐标反向问题
        //UNITY_UV_STARTS_AT_TOP总是用1或0定义，Direct3D平台为1，OpenGL平台为0
        //在Direct3D中，坐标顶点为零，向下增加
        //OpenGL坐标底部为零，向上增加
#if UNITY_UV_STARTS_AT_TOP
        if (_MainTex_TexelSize.y < 0)
        _startPos.y = 1 - _startPos.y;
#endif
    //计算uv到中间点的向量(向外扩，反过来就是向里缩)
    float2 dv = _startPos.xy - i.uv;
    //按照屏幕长宽比进行缩放
    dv = dv * float2(_ScreenParams.x / _ScreenParams.y, 1);
    //计算像素点距中点的距离
    float dis = sqrt(dv.x * dv.x + dv.y * dv.y);
    //用sin函数计算出波形的偏移值factor
    //dis在这里都是小于1的，所以我们需要乘以一个比较大的数，比如60，这样就有多个波峰波谷
    //sin函数是（-1，1）的值域，我们希望偏移值很小，所以这里我们缩小100倍，据说乘法比较快,so...
    float sinFactor = sin(dis * _distanceFactor + _Time.y * _timeFactor) * _totalFactor * 0.01;
    //距离当前波纹运动点的距离，如果小于waveWidth才予以保留，否则已经出了波纹范围，factor通过clamp设置为0
    float discardFactor = clamp(_waveWidth - abs(_curWaveDis - dis), 0, 1) / _waveWidth;
    //归一化
    float2 dv1 = normalize(dv);
    //计算每个像素uv的偏移值
    float2 offset = dv1  * sinFactor * discardFactor;
    //像素采样时偏移offset
    float2 uv = offset + i.uv;
    return tex2D(_MainTex, uv);
    }
        ENDCG

        SubShader
    {
        Pass
        {
            ZTest Always
            Cull Off
            ZWrite Off
            Fog{ Mode off }

            CGPROGRAM
#pragma vertex vert_img
#pragma fragment frag
#pragma fragmentoption ARB_precision_hint_fastest 
            ENDCG
        }
    }
    Fallback off

}

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

//非运行时也出发效果
[ExecuteInEditMode]
public class WaterWave : MonoBehaviour {

    //Inspector面板上直接拖入
    public Shader shader = null;
    private Material _material = null;

    //距离系数
    public float distanceFactor = 60.0f;
    //时间系数
    public float timeFactor = -30.0f;
    //sin函数结果系数
    public float totalFactor = 1.0f;

    //波纹宽度
    public float waveWidth = 0.3f;
    //波纹扩散的速度
    public float waveSpeed = 0.3f;

    private float waveStartTime;
    private Vector4 startPos = new Vector4(0.5f, 0.5f, 0, 0);

    //根据Shader生成材质
    public Material _Material
    {
        get
        {
            if (_material == null)
                _material = GenerateMaterial(shader);
            return _material;
        }
    }

    //根据shader创建用于屏幕特效的材质
    protected Material GenerateMaterial(Shader shader)
    {
        if (shader == null)
            return null;
        //需要判断shader是否支持
        if (shader.isSupported == false)
            return null;
        Material material = new Material(shader);
        material.hideFlags = HideFlags.DontSave;
        if (material)
            return material;
        return null;
    }

    void OnRenderImage(RenderTexture source, RenderTexture destination)
    {
        //计算波纹移动的距离，根据enable到目前的时间*速度求解
        float curWaveDistance = (Time.time - waveStartTime) * waveSpeed;
        //设置一系列参数
        _Material.SetFloat("_distanceFactor", distanceFactor);
        _Material.SetFloat("_timeFactor", timeFactor);
        _Material.SetFloat("_totalFactor", totalFactor);
        _Material.SetFloat("_waveWidth", waveWidth);
        _Material.SetFloat("_curWaveDis", curWaveDistance);
        _Material.SetVector("_startPos", startPos);
        Graphics.Blit(source, destination, _Material);
    }

    void Update()
    {
        if (Input.GetMouseButton(0))
        {
            Vector2 mousePos = Input.mousePosition;
            //将mousePos转化为（0，1）区间
            startPos = new Vector4(mousePos.x / Screen.width, mousePos.y / Screen.height, 0, 0);
            waveStartTime = Time.time;
        }
    }
}

Shader "Custom/FireEffect" {
  Properties{
    _Color("主颜色", Color) = (1,1,1,1)                       // 主色  
    _MainTex("模型贴图", 2D) = "white" {}                      // 主材质  
    _DissolveText("溶解贴图", 2D) = "white" {}                 // 溶解贴图  
    _Tile("溶解贴图的平铺大小", Range(0, 1)) = 1                // 平铺值,设置溶解贴图大小  

    _Amount("溶解值", Range(0, 1)) = 0.5                     // 溶解度  
    _DissSize("溶解大小", Range(0, 1)) = 0.1                   // 溶解范围大小  

    _DissColor("溶解主色", Color) = (1,1,1,1)                  // 溶解颜色  
    _AddColor("叠加色，与主色叠加为开始色[R|G|B>0表示启用]", Color) = (1,1,1,1) // 改色与溶解色融合形成开始色  
  }

  SubShader{

    Tags { "RenderType" = "Opaque" }
    LOD 200
    Cull off

    CGPROGRAM
    #pragma target 3.0  
    #pragma surface surf BlinnPhong  

    sampler2D _MainTex;
    sampler2D _DissolveText;
    fixed4 _Color;          // 主色  
    half _Tile;             // 平铺值  
    half _Amount;           // 溶解度  
    half _DissSize;         // 溶解范围  
    half4 _DissColor;       // 溶解颜色   
    half4 _AddColor;        // 叠加色  
    // 最终色  
    static half3 finalColor = float3(1,1,1);

    struct Input {
      float2 uv_MainTex;  // 只需要主材质的UV信息  
    };

    void surf(Input IN, inout SurfaceOutput o) {
      // 对主材质进行采样  
      fixed4 tex = tex2D(_MainTex, IN.uv_MainTex);
      // 设置主材质和颜色  
      o.Albedo = tex.rgb * _Color.rgb;
      // 对裁剪材质进行采样，取R色值  
      float ClipTex = tex2D(_DissolveText, IN.uv_MainTex / _Tile).r;

      // 裁剪量 = 裁剪材质R - 外部设置量  
      float ClipAmount = ClipTex - _Amount;
      if (_Amount > 0)
      {
        // 如果裁剪材质的R色值 < 设置的裁剪值  那么此点将被裁剪  
        if (ClipAmount < 0)
        {
          clip(-0.1);
        }
        // 然后处理没有被裁剪的值  
        else
        {
          // 针对没有被裁剪的点，【裁剪量】小于【裁剪大小】的做处理  
          // 如果设置了叠加色，那么该色为ClipAmount/_DissSize(这样会形成渐变效果)  
          if (ClipAmount < _DissSize)
          {
            if (_AddColor.x == 0)
              finalColor.x = _DissColor.x;
            else
              finalColor.x = ClipAmount / _DissSize;

            if (_AddColor.y == 0)
              finalColor.y = _DissColor.y;
            else
              finalColor.y = ClipAmount / _DissSize;

            if (_AddColor.z == 0)
              finalColor.z = _DissColor.z;
            else
              finalColor.z = ClipAmount / _DissSize;
            // 融合  
            o.Albedo = o.Albedo * finalColor * 2;
          }
        }
      }
      o.Alpha = tex.a * _Color.a;
    }
    ENDCG
  }
}