Marisa Kirisame
595159703c
- Added Paint filter. - Tweaked order of shaders. - Allow more grain parameters to be configured.
52 lines
1.1 KiB
GLSL
52 lines
1.1 KiB
GLSL
/*
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Paint filter from MariENB (first pass Kuwahara filter)
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(C)2012-2021 Marisa Kirisame
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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 = texture(InputTexture,coord);
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vec2 bresl = textureSize(InputTexture,0);
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vec2 bof = 1./bresl;
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float n = 16.;
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vec3 m[4] = vec3[](vec3(0.),vec3(0.),vec3(0.),vec3(0.)),
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s[4] = vec3[](vec3(0.),vec3(0.),vec3(0.),vec3(0.)),
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c;
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int i, j;
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for ( i=-3; i<=0; i++ ) for ( j=-3; j<=0; j++ )
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{
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c = texture(InputTexture,coord+vec2(i,j)*bof).rgb;
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m[0] += c;
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s[0] += c*c;
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}
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for ( i=-3; i<=0; i++ ) for ( j=0; j<=3; j++ )
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{
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c = texture(InputTexture,coord+vec2(i,j)*bof).rgb;
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m[1] += c;
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s[1] += c*c;
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}
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for ( i=0; i<=3; i++ ) for ( j=-3; j<=0; j++ )
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{
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c = texture(InputTexture,coord+vec2(i,j)*bof).rgb;
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m[2] += c;
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s[2] += c*c;
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}
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for ( i=0; i<=3; i++ ) for ( j=0; j<=3; j++ )
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{
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c = texture(InputTexture,coord+vec2(i,j)*bof).rgb;
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m[3] += c;
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s[3] += c*c;
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}
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float min_sigma2 = 1e+2, sigma2;
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for ( i=0; i<4; i++ )
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{
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m[i] /= n;
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s[i] = abs(s[i]/n-m[i]*m[i]);
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sigma2 = s[i].r+s[i].g+s[i].b;
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if ( sigma2 >= min_sigma2 ) continue;
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min_sigma2 = sigma2;
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res.rgb = m[i];
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}
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FragColor = res;
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}
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