Shader "Custom/Quad"
{
  Properties
  {
    _MainTex ("Texture", 2D) = "white" {}
  }
  SubShader
  {
    Cull Off
    
    Pass
    {
      CGPROGRAM

      #pragma vertex VertexProgram
      #pragma fragment FragmentProgram

      // #include "UnityCG.cginc"
      #include "UnityStandardBRDF.cginc"


      struct VertexData
      {
        fixed4 position : POSITION;
        // fixed3 normal : NORMAL;
        fixed4 color : COLOR;
        float2 uv : TEXCOORD0;
      };

      struct Interpolators
      {
        fixed4 position : SV_POSITION;
        // fixed3 normal : TEXCOORD1;
        fixed4 color : COLOR0;
        float2 uv : TEXCOORD0;
        // fixed attenuation : TEXCOORD2;
      };

      sampler2D _MainTex;
      float4 _MainTex_ST;

      Interpolators VertexProgram (VertexData v)
      {
        Interpolators i;
        i.position = UnityObjectToClipPos(v.position);
        // i.normal = UnityObjectToWorldNormal(v.normal);
        i.uv = TRANSFORM_TEX(v.uv, _MainTex);
        i.color = v.color;

        return i;
      }

      fixed4 FragmentProgram (Interpolators i) : SV_TARGET
      {
        fixed4 col = tex2D(_MainTex, i.uv);
        return i.color * col;
      }

      ENDCG
    }
  }
}