[Unity] How to create a "UV sprite deformer" - Shader source code

Shader "Unlit/DeformerShader" { Properties { _MainTex ("Texture", 2D) = "white" {} _DeformerTex ("Deformer", 2D) = "Grey" {} _MaskTex ("Deformer Mask", 2D) = "White"{} _Intensity ("Deformer Intensity", Range(-1, 1)) = 0 _Speed ("Deformer Speed", Range(-5, 5)) = 1 } SubShader { Tags { "RenderType"="Transparent" "Queue" = "Transparent"} LOD 100 Blend One OneMinusSrcAlpha Pass { CGPROGRAM #pragma vertex vert #pragma fragment frag // make fog work #pragma multi_compile_fog #include "UnityCG.cginc" struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; float2 uvDeformer : TEXCOORD1; }; struct v2f { float2 uv : TEXCOORD0; float2 uvDeformer : TEXCOORD1; UNITY_FOG_COORDS(1) float4 vertex : SV_POSITION; }; sampler2D _MainTex; float4 _MainTex_ST; sampler2D _DeformerTex; float4 _DeformerTex_ST; sampler2D _MaskTex; float _Intensity; float _Speed; v2f vert (appdata v) { v2f o; o.vertex = UnityObjectToClipPos(v.vertex); o.uv = TRANSFORM_TEX(v.uv, _MainTex); o.uvDeformer = v.uvDeformer; UNITY_TRANSFER_FOG(o,o.vertex); return o; } fixed4 frag (v2f i) : SV_Target { float2 uvDeformer = i.uvDeformer * _DeformerTex_ST.xy; float2 deformer = tex2D(_DeformerTex, uvDeformer + _Time *_Speed); float2 uvOffset = deformer * _Intensity * 0.5; fixed4 mask = tex2D(_MaskTex, i.uv); fixed4 col = tex2D(_MainTex, i.uv + uvOffset * mask.r); UNITY_APPLY_FOG(i.fogCoord, col); return col * col.a; } ENDCG } } }