AppExperiments

Shader "PlanarReflections/DepthToAlpha" {
	Properties {
		_Color ("Color", Color) = (1,1,1,1)
		_MainTex ("Albedo (RGB)", 2D) = "white" {}
		_Glossiness ("Smoothness", Range(0,1)) = 0.5
		_Metallic ("Metallic", Range(0,1)) = 0.0
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200
		
    Blend One Zero

		CGPROGRAM
		#pragma surface surf Standard noforwardadd keepalpha
		#pragma target 3.0

		sampler2D _MainTex;

		struct Input {
			float2 uv_MainTex;
      float3 worldPos;
		};

		half _Glossiness;
		half _Metallic;
		fixed4 _Color;

    float4 _ReflectionPlane;

		void surf (Input IN, inout SurfaceOutputStandard o) {
			fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
			o.Albedo = c.rgb;
			o.Metallic = _Metallic;
			o.Smoothness = _Glossiness;
      o.Alpha = pow(saturate((IN.worldPos.y - _ReflectionPlane.x) / _ReflectionPlane.y), 2);
		}
		ENDCG
	}
	FallBack "Diffuse"
}