Shader "Myshader/RotateImg"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Color("Color",Color) = (1,1,1,1)
        _RotationSpeed("RotationSpeed",Range(0,10)) = 1
        [Toggle(_IsClockWise)]_IsClockWise("IsClockWise",float) = 1
    }
        SubShader
        {
            Tags {"Queue" = "Transparent" "RenderType" = "Transparent"  "Ignoreprojector" = "true"}
            Pass
            {
                ZWrite Off
                Blend SrcAlpha OneMinusSrcAlpha
                CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag
                #include "UnityCG.cginc"

                struct a2v
                {
                    float4 vertex : POSITION;
                    float2 uv : TEXCOORD0;
                };

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

                sampler2D _MainTex;
                float4 _MainTex_ST;
                fixed4 _Color;
                half _RotationSpeed;
                bool _IsClockWise;

                v2f vert (a2v v)
                {
                    v2f o;
                    o.vertex = UnityObjectToClipPos(v.vertex);
                    o.uv = TRANSFORM_TEX(v.uv,_MainTex);
                    return o;
                }

                fixed4 frag (v2f i) : SV_Target
                {
                    float2 uv=i.uv.xy -float2(0.5,0.5);
                    if(_IsClockWise){
                        uv = float2(uv.x*cos(_RotationSpeed * _Time.y) - uv.y*sin(_RotationSpeed*_Time.y),uv.x*sin(_RotationSpeed * _Time.y) + uv.y*cos(_RotationSpeed*_Time.y));
                    }
                    else{
                        uv = float2(uv.x*cos(_RotationSpeed * _Time.y) + uv.y*sin(_RotationSpeed*_Time.y),uv.x*sin(_RotationSpeed * _Time.y) - uv.y*cos(_RotationSpeed*_Time.y));
                    }
                    uv += float2(0.5,0.5);
                    fixed4 col=tex2D(_MainTex,uv) * _Color;
                    return col;
                }
            ENDCG
        }
    }
}