lygia/v1.1.6/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])
#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])
#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
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