LYGIA Shader Library

Use:

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

Check it on Github

#ifndef FNC_BLENDCOLORDODGE
#define FNC_BLENDCOLORDODGE
float blendColorDodge(in float base, in float blend) { return (blend == 1.)? blend: min( base / (1. - blend), 1.); }
vec3  blendColorDodge(in vec3 base, in vec3 blend) {
    return vec3(blendColorDodge(base.r, blend.r),
                blendColorDodge(base.g, blend.g),
                blendColorDodge(base.b, blend.b));
}
vec3  blendColorDodge(in vec3 base, in vec3 blend, in float opacity) { return (blendColorDodge(base, blend) * opacity + base * (1. - opacity)); }
#endif

Use:

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

Check it on Github

#ifndef FNC_BLENDCOLORDODGE
#define FNC_BLENDCOLORDODGE
float blendColorDodge(in float base, in float blend) {
    return (blend == 1.)? blend: min( base / (1. - blend), 1.);
}

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

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