Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//====== Copyright © 1996-2006, Valve Corporation, All rights reserved. =======
//
// Purpose:
//
//=============================================================================
// DYNAMIC: "WRITE_DEPTH_TO_DESTALPHA" "0..1" [ps20b] [PC]
// DYNAMIC: "WRITE_DEPTH_TO_DESTALPHA" "0..0" [ps20b] [XBOX]
// DYNAMIC: "WRITE_DEPTH_TO_DESTALPHA" "0..1" [ps30]
// DYNAMIC: "PIXELFOGTYPE" "0..1"
#include "common_ps_fxc.h"
#include "shader_constant_register_map.h"
sampler BaseTextureSampler : register( s0 );
sampler IrisSampler : register( s1 );
sampler GlintSampler : register( s2 );
const float4 cEyeScalars : register( c0 ); // { Dilation, ambient, x, x }
const float4 g_FogParams : register( PSREG_FOG_PARAMS );
const float4 g_EyePos_SpecExponent : register( PSREG_EYEPOS_SPEC_EXPONENT );
struct PS_INPUT
{
float2 baseTexCoord : TEXCOORD0;
float2 irisTexCoord : TEXCOORD1;
float2 glintTexCoord : TEXCOORD2;
float3 vertAtten : TEXCOORD3;
float4 worldPos_projPosZ : TEXCOORD7; // Necessary for pixel fog
};
#define fDilationFactor cEyeScalars.x
#define fGlintDamping cEyeScalars.y
float4 main( PS_INPUT i ) : COLOR
{
float4 baseSample = tex2D( BaseTextureSampler, i.baseTexCoord );
float4 glintSample = tex2D( GlintSampler, i.glintTexCoord );
/*
// Dilate the pupil/iris texture (1 is max dilation, 0 is none)
float2 biasedCoords = i.irisTexCoord * 2.0f - 1.0f; // -1 to +1 range
float fDilatability = saturate(0.8f - sqrt(dot(biasedCoords, biasedCoords) )); // 1 in the center, fading out to 0 at 0.8 from center, since irises are inset into maps
float2 scaledCoords = biasedCoords * (1 + fDilatability); // Maximal dilation
// Blend undilated and maximally dilated based upon dilation factor
float2 dilatedCoords = lerp( scaledCoords, biasedCoords, 1.0f-saturate(cDilationFactor.x));
dilatedCoords = dilatedCoords * 0.5f + 0.5f; // Back to 0..1 range
*/
float4 irisSample = tex2D( IrisSampler, i.irisTexCoord ); // Sample the iris map using dilated coordinates
float4 result;
result.rgb = lerp( baseSample.rgb, irisSample.rgb, irisSample.a );
result.rgb *= i.vertAtten;
result.rgb += glintSample.rgb * fGlintDamping;
result.a = baseSample.a;
bool bWriteDepthToAlpha = false;
// ps_2_b and beyond
#if !(defined(SHADER_MODEL_PS_1_1) || defined(SHADER_MODEL_PS_1_4) || defined(SHADER_MODEL_PS_2_0))
bWriteDepthToAlpha = WRITE_DEPTH_TO_DESTALPHA != 0;
#endif
float fogFactor = CalcPixelFogFactor( PIXELFOGTYPE, g_FogParams, g_EyePos_SpecExponent.z, i.worldPos_projPosZ.z, i.worldPos_projPosZ.w );
return FinalOutput( result, fogFactor, PIXELFOGTYPE, TONEMAP_SCALE_LINEAR, bWriteDepthToAlpha, i.worldPos_projPosZ.w );
}