Shader "Hidden/FlipBlit"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _FlipX ("Flip X", Float) = 0
        _FlipY ("Flip Y", Float) = 0
    }
    SubShader
    {
        Pass
        {
            ZTest Always Cull Off ZWrite Off
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _MainTex;
            float4 _MainTex_ST;
            float _FlipX;
            float _FlipY;

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

            v2f vert (appdata_t 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;
                if (_FlipX > 0.5) uv.x = 1.0 - uv.x;
                if (_FlipY > 0.5) uv.y = 1.0 - uv.y;
                return tex2D(_MainTex, uv);
            }
            ENDCG
        }
    }
}