LYGIA Shader Library

Use:

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

Check it on Github

#ifndef FNC_BLENDLIGHTEN
#define FNC_BLENDLIGHTEN
float blendLighten(in float base, in float blend) {
    return max(blend, base);
}

vec3 blendLighten(in vec3 base, in vec3 blend) {
    return vec3(blendLighten(base.r, blend.r),
                blendLighten(base.g, blend.g),
                blendLighten(base.b, blend.b));
}

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

Use:

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

Check it on Github

#ifndef FNC_BLENDLIGHTEN
#define FNC_BLENDLIGHTEN
float blendLighten(in float base, in float blend) {
    return max(blend, base);
}

float3 blendLighten(in float3 base, in float3 blend) {
    return float3(  blendLighten(base.r, blend.r),
                    blendLighten(base.g, blend.g),
                    blendLighten(base.b, blend.b) );
}

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