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Assets/SteamVR/Resources/SteamVR_AlphaOut.shader

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+//======= Copyright (c) Valve Corporation, All rights reserved. ===============
+// UNITY_SHADER_NO_UPGRADE
+Shader "Custom/SteamVR_AlphaOut" {
+	Properties { _MainTex ("Base (RGB)", 2D) = "white" {} }
+
+	CGINCLUDE
+
+	#include "UnityCG.cginc"
+
+	sampler2D _MainTex;
+
+	struct v2f {
+		float4 pos : SV_POSITION;
+		float2 tex : TEXCOORD0;
+	};
+
+	v2f vert(appdata_base v) {
+		v2f o;
+#if UNITY_VERSION >= 540
+		o.pos = UnityObjectToClipPos(v.vertex);
+#else
+		o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
+#endif
+		o.tex = v.texcoord;
+		return o;
+	}
+
+	float luminance(float3 color)
+	{
+		return 0.2126 * color.r + 0.7152 * color.g + 0.0722 * color.b;
+	}
+
+	float4 frag(v2f i) : COLOR {
+		float4 color = tex2D(_MainTex, i.tex);
+		float a = saturate(color.a + luminance(color.rgb));
+		return float4(a, a, a, a);
+	}
+
+	ENDCG
+
+	SubShader {
+		Pass {
+			ZTest Always Cull Off ZWrite Off
+			Fog { Mode Off }
+
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			ENDCG
+		}
+	}
+}