74 lines
2 KiB
PostScript
74 lines
2 KiB
PostScript
#include "common.h"
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/*
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struct v2p
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{
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float4 tc0: TEXCOORD0; // Central
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float4 tc1: TEXCOORD1; // -1,+1
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float4 tc2: TEXCOORD2; // -2,+2
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float4 tc3: TEXCOORD3; // -3,+3
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float4 tc4: TEXCOORD4; // -4,+4
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float4 tc5: TEXCOORD5; // -5,+5
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float4 tc6: TEXCOORD6; // -6,+6
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float4 tc7: TEXCOORD7; // -7,+7
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};
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*/
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//////////////////////////////////////////////////////////////////////////////////////////
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uniform float4 MiddleGray;
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//////////////////////////////////////////////////////////////////////////////////////////
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// perform 4x4 bilinear, 8x8p, the step (C)
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// c): 8x8p => 1x1p with exp
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// native bilinear
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float sample( float2 tc )
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{
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// float4 data = tex2D(s_image,tc);
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float4 data = s_image.Sample( smp_rtlinear, tc );
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return dot( data, 1.h/4.h ); // sum components
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}
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float4 main ( p_filter I ) : SV_Target
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{
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// sample
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float4 accum0;
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accum0.x = sample(I.Tex0);
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accum0.y = sample(I.Tex1);
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accum0.z = sample(I.Tex2);
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accum0.w = sample(I.Tex3);
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float4 accum1;
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accum1.x = sample(I.Tex4);
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accum1.y = sample(I.Tex5);
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accum1.z = sample(I.Tex6);
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accum1.w = sample(I.Tex7);
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float4 accum2;
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accum2.x = sample(I.Tex0.wz);
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accum2.y = sample(I.Tex1.wz);
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accum2.z = sample(I.Tex2.wz);
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accum2.w = sample(I.Tex3.wz);
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float4 accum3;
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accum3.x = sample(I.Tex4.wz);
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accum3.y = sample(I.Tex5.wz);
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accum3.z = sample(I.Tex6.wz);
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accum3.w = sample(I.Tex7.wz);
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// perform accumulation
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float4 final;
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final.x = dot(accum0,1/4.h);
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final.y = dot(accum1,1/4.h);
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final.z = dot(accum2,1/4.h);
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final.w = dot(accum3,1/4.h);
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float result = dot(final, 1/4.h);
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// OK
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float scale = MiddleGray.x / (result*MiddleGray.y + MiddleGray.z); // final
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// float scale_prev = tex2D (s_tonemap,I.tc0).x;
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float scale_prev = s_tonemap.Sample( smp_nofilter, I.Tex0 ).x;
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float rvalue = lerp (scale_prev,scale,MiddleGray.w);
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// clamp (rvalue, 1.f/8.f, 2.0f);
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clamp (rvalue, 1.f/128.f, 20.0f);
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return rvalue ;
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}
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