Add shaders

Sources/Shaders/NullShader.shader

@@ -0,0 +1,34 @@
+Shader "GlobalSnow/NullShader" {
+Properties {
+}
+
+SubShader {
+	Pass {
+	ZWrite Off ZTest Always
+
+	CGPROGRAM
+	#pragma vertex vert
+	#pragma fragment frag
+	#include "UnityCG.cginc"
+	
+	struct v2f {
+    	float4 pos : SV_POSITION;
+	};
+
+	v2f vert( appdata_base v ) {
+	    v2f o;
+	    o.pos = 0;
+	    return o;
+	}
+	
+	fixed4 frag(v2f i) : SV_Target {
+		discard;
+		return fixed4(0,0,0,0);
+	}
+	ENDCG
+	}
+	
+}
+
+Fallback Off
+}