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//======= Copyright <EFBFBD> 1996-2006, Valve Corporation, All rights reserved. ======
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// STATIC: "CONSTANTBASEDMORPH" "0..1"
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#define HDRTYPE HDR_TYPE_NONE
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#include "common_ps_fxc.h"
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struct PS_INPUT
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{
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float2 vSrcCoord : TEXCOORD0;
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float2 vSideSpeedCoord : TEXCOORD1;
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#if CONSTANTBASEDMORPH
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float4 vMorphWeights : TEXCOORD2;
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#else
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float2 vMorphWeightCoord : TEXCOORD2;
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#endif
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};
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sampler MorphTarget : register( s0 );
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sampler SideSpeedMap : register( s1 );
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#if !CONSTANTBASEDMORPH
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sampler MorphWeights : register( s2 );
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#endif
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const float4 vMorphScale : register( c0 );
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HALF4 main( PS_INPUT i ) : COLOR
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{
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#if CONSTANTBASEDMORPH
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float4 vMorphWeights = i.vMorphWeights;
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#else
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float4 vMorphWeights = tex2D( MorphWeights, i.vMorphWeightCoord );
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#endif
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float4 delta = tex2D( MorphTarget, i.vSrcCoord );
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float4 sideSpeed = tex2D( SideSpeedMap, i.vSideSpeedCoord );
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// NOTE: This is necessary to fixup slight errors in the delta.
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// On the cpu, only the range 0-65534 is used so we can encode -1, 0, and 1 exactly.
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delta *= 65535.0f / 65534.0f;
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// Compute total weight, taking into account side + speed
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float flWeight = lerp( vMorphWeights.y, vMorphWeights.x, sideSpeed.y );
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float flStereoWeight = lerp( vMorphWeights.w, vMorphWeights.z, sideSpeed.y );
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float w = lerp( flWeight, flStereoWeight, sideSpeed.x );
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// Convert 0-1 -> -1 to 1
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delta *= 2.0f;
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delta -= float4( 1.0f, 1.0f, 1.0f, 1.0f );
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// Apply the morph scale
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delta *= vMorphScale;
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// Apply weight
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delta *= w;
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return delta;
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}
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