LYGIA Shader Library

negation (lygia/v1.2.0/color/blend/negation)

Photoshop Negation blend mode mplementations sourced from this article on https://mouaif.wordpress.com/2009/01/05/photoshop-math-with-glsl-shaders/

Use:

blendNegation(<float|vec3> base, <float|vec3> blend [, <float> opacity])

Check it on Github


#ifndef FNC_BLENDNEGATION
#define FNC_BLENDNEGATION
float blendNegation(in float base, in float blend) {
    return 1. - abs(1. - base - blend);
}

vec3 blendNegation(in vec3 base, in vec3 blend) {
    return vec3(1.) - abs(vec3(1.) - base - blend);
}

vec3 blendNegation(in vec3 base, in vec3 blend, in float opacity) {
    return (blendNegation(base, blend) * opacity + base * (1. - opacity));
}
#endif

Use:

blendNegation(<float|float3> base, <float|float3> blend [, <float> opacity])

Check it on Github


#ifndef FNC_BLENDNEGATION
#define FNC_BLENDNEGATION
float blendNegation(in float base, in float blend) {
    return 1. - abs(1. - base - blend);
}

float3 blendNegation(in float3 base, in float3 blend) {
    return float3(1., 1., 1.) - abs(float3(1., 1., 1.) - base - blend);
}

float3 blendNegation(in float3 base, in float3 blend, in float opacity) {
    return (blendNegation(base, blend) * opacity + base * (1. - opacity));
}
#endif

License

MIT License (MIT) Copyright (c) 2015 Jamie Owen

LYGIA is dual-licensed under the Prosperity License and the Patron License for sponsors and contributors.

Sponsors and contributors are automatically added to the Patron License and they can ignore the any non-commercial rule of the Prosperity Licensed software (please take a look to the exception).

It's also possible to get a permanent comercial license hook to a single and specific version of LYGIA.

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