Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//======= Copyright <EFBFBD> 1996-2006, Valve Corporation, All rights reserved. ======
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#include "common_ps_fxc.h"
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sampler TexSampler : register( s0 );
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sampler TexRed : register( s1 );
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sampler TexGreen : register( s2 );
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sampler TexBlue : register( s3 );
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float2 g_vPixelSize : register( c4 );
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struct PS_INPUT
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{
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float2 baseTexCoord : TEXCOORD0; // Base texture coordinate
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};
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float4 main( PS_INPUT i ) : COLOR
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{
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// 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
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float2 vOffset = 2.0f * g_vPixelSize.xy;
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// Take the max of 4 offset texture samples
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float4 result;
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result.rgba = tex2D( TexSampler, i.baseTexCoord.xy + float2( vOffset.x, vOffset.y ) );
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result.rgba = max( result.rgba, tex2D( TexSampler, i.baseTexCoord.xy + float2( vOffset.x, -vOffset.y ) ) );
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result.rgba = max( result.rgba, tex2D( TexSampler, i.baseTexCoord.xy + float2( -vOffset.x, vOffset.y ) ) );
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result.rgba = max( result.rgba, tex2D( TexSampler, i.baseTexCoord.xy + float2( -vOffset.x, -vOffset.y ) ) );
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// Store max color component in alpha for alpha blend of one/invSrcAlpha
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float flLuminance = max( result.r, max( result.g, result.b ) );
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result.a = flLuminance;
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return result.rgba;
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}
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