SurfaceScreenspaceTexture.shader

Shader "Tutorial/039_ScreenspaceTextures/Surface" {
	Properties {
		_Color ("Tint", Color) = (0, 0, 0, 1)
		_MainTex ("Texture", 2D) = "white" {}
		_Smoothness ("Smoothness", Range(0, 1)) = 0
		_Metallic ("Metalness", Range(0, 1)) = 0
		[HDR] _Emission ("Emission", color) = (0,0,0)
	}
	SubShader {
		Tags{ "RenderType"="Opaque" "Queue"="Geometry"}

		CGPROGRAM

		#pragma surface surf Standard fullforwardshadows
		#pragma target 3.0

		sampler2D _MainTex;
        float4 _MainTex_ST;
		fixed4 _Color;

		half _Smoothness;
		half _Metallic;
		half3 _Emission;

		struct Input {
			float4 screenPos;
		};

		void surf (Input i, inout SurfaceOutputStandard o) {
            float2 textureCoordinate = i.screenPos.xy / i.screenPos.w;
            float aspect = _ScreenParams.x / _ScreenParams.y;
            textureCoordinate.x = textureCoordinate.x * aspect;
            textureCoordinate = TRANSFORM_TEX(textureCoordinate, _MainTex);

			fixed4 col = tex2D(_MainTex, textureCoordinate);
			col *= _Color;
			o.Albedo = col.rgb;
			o.Metallic = _Metallic;
			o.Smoothness = _Smoothness;
			o.Emission = _Emission;
		}
		ENDCG
	}
	FallBack "Standard"
}