Shader "Unlit/TexOffsetTowCol"
{
    Properties
    {        
        [HDR]_Col1("Col1",color)=(1,1,1,1)
        [HDR]_Col2("Col2",color) = (1,1,1,1)
        _MainTex ("Texture", 2D) = "white" {}
        _OffsetSpeed("OffsetSpeed",vector) = (1,1,0,0)
        _ColorRange("ColorRange",Range(0,1)) = 1
    }
    SubShader
    {
        Tags {"Queue" = "Transparent" "RenderType" = "Transparent" }


        Pass
        {
            ZWrite Off
            Blend SrcAlpha OneMinusSrcAlpha


            CGPROGRAM


            #pragma vertex vert
            #pragma fragment frag


            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
                half4 color : COLOR;
            };

            struct v2f
            {
                float4 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
                half4 color: TEXCOORD1;  

            };

            sampler2D _MainTex;
            float4 _MainTex_ST;           
            float4 _OffsetSpeed;
            float4 _Col1, _Col2;
            float _ColorRange;
            v2f vert(appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv.xy = v.uv.xy;
                o.uv.zw = v.uv.xy * _MainTex_ST.xy + _MainTex_ST.wz + _Time.y * _OffsetSpeed.xy;
                o.color = v.color;
                return o;
            }

            half4 frag(v2f i) : SV_Target
            {
                float factor = smoothstep(0,_ColorRange,i.uv.x);
                half4 col3 = lerp(_Col1,_Col2, factor);
                half4 col = tex2D(_MainTex, i.uv.zw) * col3;
                return col;
            }
            ENDCG
        }

      
    }
}