46 lines
852 B
Text
46 lines
852 B
Text
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//!DESC unsharp
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//!HOOK SCALED
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//!BIND HOOKED
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#define effect_width 1
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#define coeff_blur 0.9
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#define coeff_orig (1 + coeff_blur)
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#define Src(a,b) HOOKED_texOff(vec2(a,b))
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#define dx (effect_width)
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#define dy (effect_width)
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vec4 hook()
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{
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// Retrieves the original pixel
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vec4 orig = Src(0,0);
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// Calculates blurred image (gaussian blur)
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vec4 c1 = Src(-dx,-dy);
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vec4 c2 = Src(0,-dy);
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vec4 c3 = Src(dx,-dy);
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vec4 c4 = Src(-dx,0);
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vec4 c5 = Src(dx,0);
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vec4 c6 = Src(-dx,dy);
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vec4 c7 = Src(0,dy);
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vec4 c8 = Src(dx,dy);
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// gaussian blur filter
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// [ 1, 2 , 1 ]
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// [ 2, 4 , 2 ]
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// [ 1, 2 , 1 ]
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// c1 c2 c3
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// c4 c5
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// c6 c7 c8
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vec4 blur = (c1 + c3 + c6 + c8 + 2 * (c2 + c4 + c5 + c7) + 4 * orig)/16;
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// The blurred image is substracted from the origginal image
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vec4 corr = coeff_orig*orig - coeff_blur*blur;
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return corr;
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}
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