38 lines
1.6 KiB
GLSL
38 lines
1.6 KiB
GLSL
/*
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Paint filter from MariENB (third pass FXAA)
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(C)2012-2022 Marisa the Magician
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*/
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void main()
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{
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vec2 coord = TexCoord;
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vec4 res = vec4(1.);
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vec2 bresl = textureSize(InputTexture,0);
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vec2 bof = 1./bresl;
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float fxaareducemul = 1./16.;
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float fxaareducemin = 1./128.;
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float fxaaspanmax = 4.;
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vec3 rgbNW = texture(InputTexture,coord+vec2(-1,-1)*bof).rgb;
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vec3 rgbNE = texture(InputTexture,coord+vec2(1,-1)*bof).rgb;
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vec3 rgbSW = texture(InputTexture,coord+vec2(-1,1)*bof).rgb;
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vec3 rgbSE = texture(InputTexture,coord+vec2(1,1)*bof).rgb;
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vec3 rgbM = texture(InputTexture,coord).rgb;
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vec3 luma = vec3(.299,.587,.114);
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float lumaNW = dot(rgbNW,luma);
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float lumaNE = dot(rgbNE,luma);
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float lumaSW = dot(rgbSW,luma);
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float lumaSE = dot(rgbSE,luma);
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float lumaM = dot(rgbM,luma);
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float lumaMin = min(lumaM,min(min(lumaNW,lumaNE),min(lumaSW,lumaSE)));
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float lumaMax = max(lumaM,max(max(lumaNW,lumaNE),max(lumaSW,lumaSE)));
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vec2 dir = vec2(-((lumaNW+lumaNE)-(lumaSW+lumaSE)),((lumaNW+lumaSW)-(lumaNE+lumaSE)));
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float dirReduce = max((lumaNW+lumaNE+lumaSW+lumaSE)*(.25*fxaareducemul),fxaareducemin);
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float rcpDirMin = 1./(min(abs(dir.x),abs(dir.y))+dirReduce);
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dir = min(vec2(fxaaspanmax,fxaaspanmax),max(vec2(-fxaaspanmax,-fxaaspanmax),dir*rcpDirMin))/bresl;
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vec3 rgbA = (1./2.)*(texture(InputTexture,coord+dir*(1./3.-.5)).rgb+texture(InputTexture,coord+dir*(2./3.-.5)).rgb);
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vec3 rgbB = rgbA*(1./2.)+(1./4.)*(texture(InputTexture,coord+dir*(0./3.-.5)).rgb+texture(InputTexture,coord+dir*(3./3.-.5)).rgb);
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float lumaB = dot(rgbB,luma);
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if ( (lumaB < lumaMin) || (lumaB > lumaMax) ) res.rgb = rgbA;
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else res.rgb = rgbB;
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FragColor = res;
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}
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