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

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

#include "UnityCG.cginc"

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

  uniform sampler2D _MainTex;
  uniform float _FlipX;

  v2f vert (appdata_img v)
  {
    v2f o;
    o.pos = UnityObjectToClipPos (v.vertex);

#if STEREOPACK_TOP
    o.pos.y = (o.pos.y / 2.0) - 0.5;
#elif STEREOPACK_BOTTOM
    o.pos.y = (o.pos.y / 2.0) + 0.5;
#elif STEREOPACK_LEFT
    o.pos.x = (o.pos.x / 2.0) - 0.5;
#elif STEREOPACK_RIGHT
    o.pos.x = (o.pos.x / 2.0) + 0.5;
#endif

    float2 uv = v.texcoord.xy;
    o.uv = uv;
    return o;
  }

  half4 frag (v2f i): COLOR
  {
    return tex2D (_MainTex, i.uv);
  }
  ENDCG

  Subshader
  {
    ZTest Always
    Cull Off
    ZWrite Off
    Fog { Mode off }
    Pass
    {
      CGPROGRAM
#pragma multi_compile __ STEREOPACK_TOP STEREOPACK_BOTTOM STEREOPACK_LEFT STEREOPACK_RIGHT
#pragma vertex vert
#pragma fragment frag
      ENDCG
    }
  }
  Fallback Off
}