1.代码

Shader "Custom/WaveScreen"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _NoiseTex("Noise 1",2D) = "white" {}
        _Magnitude("magnitue",range(-1,1)) = 0.0
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            sampler2D _MainTex;
            sampler2D _NoiseTex;
            float _Magnitude;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                float2 distuv = float2(i.uv.x + _Time.x * 2, i.uv.y + _Time.x * 2);

                float2 disp = tex2D(_NoiseTex, distuv).xy;
                disp = ((disp * 2) - 1) * _Magnitude;

                float4 col = tex2D(_MainTex, i.uv + disp);
                return col;
            }
            ENDCG
        }
    }
}

2.噪声图

3.原图，_Magnitude值为0时

4.效果图