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materialsystem/stdshaders/haloaddoutline_ps2x.fxc

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+//======= Copyright <20> 1996-2006, Valve Corporation, All rights reserved. ======
+
+#include "common_ps_fxc.h"
+
+sampler TexSampler : register( s0 );
+sampler TexRed : register( s1 );
+sampler TexGreen : register( s2 );
+sampler TexBlue : register( s3 );
+
+float2 g_vPixelSize : register( c4 );
+
+struct PS_INPUT
+{
+	float2 baseTexCoord : TEXCOORD0; // Base texture coordinate
+};
+
+float4 main( PS_INPUT i ) : COLOR
+{
+	// Make outline 2 pixels wide $C0_X in a vmt doesn't seem to work in staging so I can't parameterize this right now
+	float2 vOffset = 2.0f * g_vPixelSize.xy;
+
+	// Take the max of 4 offset texture samples
+	float4 result;
+	result.rgba = tex2D( TexSampler, i.baseTexCoord.xy + float2( vOffset.x, vOffset.y ) );
+	result.rgba = max( result.rgba, tex2D( TexSampler, i.baseTexCoord.xy + float2( vOffset.x, -vOffset.y ) ) );
+	result.rgba = max( result.rgba, tex2D( TexSampler, i.baseTexCoord.xy + float2( -vOffset.x, vOffset.y ) ) );
+	result.rgba = max( result.rgba, tex2D( TexSampler, i.baseTexCoord.xy + float2( -vOffset.x, -vOffset.y ) ) );
+
+	// Store max color component in alpha for alpha blend of one/invSrcAlpha
+	float flLuminance = max( result.r, max( result.g, result.b ) );
+	result.a = flLuminance;
+
+	return result.rgba;
+}