81 lines
2.2 KiB
PostScript
81 lines
2.2 KiB
PostScript
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#include "common.h"
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//////////////////////////////////////////////////////////////////////////////////////////
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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 = s_image.Sample( smp_rtlinear, tc );
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return dot( data, 1.0/4.0 ); // 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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float4 ratio = float2( 1/screen_res.x,1/screen_res.y).xyxy;
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ratio.x = 1;
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//ratio.y = 1.77;
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//ratio.y = 0.5625;
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ratio.y = screen_res.x/screen_res.y;
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//ratio.xyzw = ratio.xyxy;
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ratio.xyzw = ratio.xyyx;
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float4 UVavg = (I.Tex0+I.Tex1+I.Tex2+I.Tex3+I.Tex4+I.Tex5+I.Tex6+I.Tex7)/8;
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//adjust for aspect ratio
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I.Tex0 = UVavg + ((I.Tex0 - UVavg) * ratio);
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I.Tex1 = UVavg + ((I.Tex1 - UVavg) * ratio);
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I.Tex2 = UVavg + ((I.Tex2 - UVavg) * ratio);
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I.Tex3 = UVavg + ((I.Tex3 - UVavg) * ratio);
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I.Tex4 = UVavg + ((I.Tex4 - UVavg) * ratio);
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I.Tex5 = UVavg + ((I.Tex5 - UVavg) * ratio);
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I.Tex6 = UVavg + ((I.Tex6 - UVavg) * ratio);
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I.Tex7 = UVavg + ((I.Tex7 - UVavg) * ratio);
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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(accum0,1.0/4.0);
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final.y = dot(accum1,1.0/4.0);
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final.z = dot(accum2,1.0/4.0);
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final.w = dot(accum3,1.0/4.0);
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float result = dot(final, 1.0/4.0);
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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 = 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, 1.0/128.0, 20.0);
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return rvalue;
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}
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