// Copyright (c) 2019-present Evereal. All rights reserved.

Shader "VideoCapture/CopyReverse"
{
  Properties
  {
    _MainTex ("Texture", 2D) = "" {}
  }
  CGINCLUDE

  #include "UnityCG.cginc"

  struct v2f
  {
    float4 pos : POSITION;
    float2 uv : TEXCOORD0;
  };

  uniform sampler2D _MainTex;

  v2f vert (appdata_img v)
  {
    v2f o;
    o.pos = UnityObjectToClipPos (v.vertex);
    float2 uv = v.texcoord.xy;
    o.uv = uv;
    return o;
  }

  half4 frag (v2f i): COLOR
  {
#if REVERSE_TOP_BOTTOM
    float2 uv;
    uv.y = 1 - i.uv.y;
    uv.x = i.uv.x;
    i.uv = uv;
#elif REVERSE_LEFT_RIGHT
    float2 uv;
    uv.y = i.uv.y;
    uv.x = 1 - i.uv.x;
    i.uv = uv;
#endif
    return tex2D (_MainTex, i.uv);
  }
  ENDCG

  Subshader
  {
    ZTest Always
    Cull Off
    ZWrite Off
    Fog { Mode off }
    Pass
    {
      CGPROGRAM
#pragma multi_compile __ REVERSE_TOP_BOTTOM REVERSE_LEFT_RIGHT
#pragma vertex vert
#pragma fragment frag
      ENDCG
    }
  }
  Fallback Off
}