Add shaders

Sources/Shaders/SnowOverlay.shader

@@ -0,0 +1,49 @@
+Shader "GlobalSnow/Deferred Overlay" {
+	Properties {
+		[HideInInspector] _Color ("Color", Color) = (1,1,1,1)
+		[HideInInspector] _MainTex ("Albedo (RGB)", 2D) = "white" {}
+	}
+	SubShader {
+		ZTest Always Cull Off ZWrite Off
+	  	Fog { Mode Off }
+// Uncomment to support excluding terrain (see documentation for additional steps)
+/*		Stencil {
+			Ref 8
+			ReadMask 8
+			Comp notEqual
+			Pass keep
+		}
+*/
+		Pass {	
+			CGPROGRAM
+      		#pragma vertex vert
+      		#pragma fragment frag
+      		#pragma target 3.0
+      		#pragma exclude_renderers nomrt
+			#pragma fragmentoption ARB_precision_hint_fastest
+			#pragma multi_compile _ GLOBALSNOW_RELIEF GLOBALSNOW_OCCLUSION
+			#pragma multi_compile _ GLOBALSNOW_FOOTPRINTS
+			#pragma multi_compile _ GLOBALSNOW_TERRAINMARKS
+			#pragma multi_compile _ UNITY_HDR_ON
+			#define GLOBALSNOW_ENABLE_SLOPE_CONTROL
+      		#include "SnowOverlay.cginc"
+      		ENDCG
+      	}
+		Pass {	
+			CGPROGRAM
+      		#pragma vertex vert
+      		#pragma fragment frag
+      		#pragma target 3.0
+      		#pragma exclude_renderers nomrt
+			#pragma fragmentoption ARB_precision_hint_fastest
+			#pragma multi_compile _ GLOBALSNOW_FOOTPRINTS
+			#pragma multi_compile _ GLOBALSNOW_TERRAINMARKS
+			#pragma multi_compile _ UNITY_HDR_ON
+			#define GLOBALSNOW_ENABLE_SLOPE_CONTROL
+			#define GLOBALSNOW_FLAT_SHADING 1
+      		#include "SnowOverlay.cginc"
+      		ENDCG
+      	}
+	}
+	FallBack Off
+}