Skybox.shader

Shader "Lean/Common/Skybox"
{
	Properties
	{
		_Color1("Color 1", Color) = (1.0, 0.5, 0.5, 1.0)
		_Color2("Color 2", Color) = (0.5, 0.5, 1.0, 1.0)
		_Scale("Scale", Float) = 1.0
	}

	SubShader
	{
		Cull Off
		ZWrite Off

		Tags
		{
			"Queue" = "Geometry"
			"PreviewType" = "Skybox"
		}

		Pass
		{
			CGPROGRAM
			#pragma vertex Vert
			#pragma fragment Frag

			float4 _Color1;
			float4 _Color2;
			float  _Scale;

			struct a2v
			{
				float4 vertex : POSITION;
			};

			struct v2f
			{
				float4 vertex   : SV_POSITION;
				float4 position : TEXCOORD0;
			};

			struct f2g
			{
				float4 color : SV_TARGET;
			};

			void Vert(a2v i, out v2f o)
			{
				o.vertex = o.position = UnityObjectToClipPos(i.vertex);
			}

			void Frag(v2f i, out f2g o)
			{
				o.color = lerp(_Color1, _Color2, length(i.position.xy / i.position.w) * _Scale);
			}
			ENDCG
		} // Pass
	} // SubShader
} // Shader