SDK sync.

materialsystem/stdshaders/eyes_ps2x.fxc

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+//====== Copyright <20> 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  );
+}