35 lines
982 B
GLSL
35 lines
982 B
GLSL
/*
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Complex grain shader ported over from MariENB
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(C)2012-2022 Mari the Deer
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Edited for reduced texture sampling (3 fetches instead of 6).
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*/
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const float nf = .0005;
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const vec3 nm = vec3(2.05,3.11,2.22);
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const float np = 3.95;
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const float bnp = 1.7;
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#define darkmask(a,b) (a>0.5)?(2.0*a*(0.5+b)):(1.0-2.0*(1.0-a)*(1.0-((0.5+b))))
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vec3 grain( in vec3 res, in vec2 coord )
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{
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float ts = Timer*nf;
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float nx = texture(NoiseTexture,coord*nm.x+vec2(ts,0.)).x;
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float ny = texture(NoiseTexture,coord*nm.y+vec2(0.,ts)).x;
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float n = clamp(texture(NoiseTexture,vec2(nx,ny)*nm.z+vec2(ts,ts)).x,0.,1.);
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float nt = pow(n,np);
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float bn = 1.-clamp((res.r+res.g+res.b)/3.,0.,1.);
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bn = pow(bn,bnp);
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res.rgb += vec3(nt*bn*ni);
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return res;
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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 sfact = max(vec2(640.,400.),vec2(textureSize(InputTexture,0))*.5);
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coord = floor(coord*sfact)/sfact;
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res.rgb = grain(res.rgb,coord);
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FragColor = res;
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}
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