20 lines
636 B
GLSL
20 lines
636 B
GLSL
/*
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LUT color grading from MariENB
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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 = texture(InputTexture,coord);
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vec3 lc = clamp(res.rgb,0.,63./64.);
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vec2 lcoord = vec2((lc.r+lutindex)/32.,lc.g/64.)+vec2(1./4096.,1./8192.);
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float minb = floor(lc.b*64.)/64.;
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float maxb = ceil(lc.b*64.)/64.;
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float theta = fract(lc.b*64.);
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vec3 luta = textureLod(LUTTexture,lcoord+vec2(0,minb),0.).rgb;
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vec3 lutb = textureLod(LUTTexture,lcoord+vec2(0,maxb),0.).rgb;
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vec3 lutm = mix(luta,lutb,vec3(theta)); // has to be vec3 for whatever reason
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res.rgb = mix(res.rgb,lutm,lutblend);
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FragColor = res;
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}
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