1.本质上和透明通道shader没什么两样

注意主要是下面标签

Tags{ 
    "RenderType"="Transparent" 
    "Queue"="Transparent"
}

Blend SrcAlpha OneMinusSrcAlpha

2.完整代码

Shader "Custom/SpriteWave"{
    Properties{
        _Color ("Tint", Color) = (0, 0, 0, 1)
        _MainTex ("Texture", 2D) = "white" {}
    }

    SubShader{
        Tags{ 
            "RenderType"="Transparent" 
            "Queue"="Transparent"
        }

        Blend SrcAlpha OneMinusSrcAlpha

        ZWrite off
        Cull off

        Pass{

            CGPROGRAM

            #include "UnityCG.cginc"

            #pragma vertex vert
            #pragma fragment frag

            sampler2D _MainTex;

            fixed4 _Color;

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

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

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

            fixed4 frag(v2f i) : SV_TARGET{
                float2 offset = float2(_Time.x * 3.0,0);
                i.uv += offset;
                fixed4 col = tex2D(_MainTex, i.uv);
                col *= _Color;
                return col;
            }

            ENDCG
        }
    }
}

3.贴图的设置

4.效果