LYGIA Shader Library

Use:

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

Check it on Github

#ifndef FNC_BLENDCOLORBURN
#define FNC_BLENDCOLORBURN
float blendColorBurn(in float base, in float blend) { return (blend == 0.)? blend: max((1. - ((1. - base ) / blend)), 0.); }
vec3  blendColorBurn(in vec3 base, in vec3 blend) {
    return vec3(blendColorBurn(base.r, blend.r),
                blendColorBurn(base.g, blend.g),
                blendColorBurn(base.b, blend.b));
}
vec3  blendColorBurn(in vec3 base, in vec3 blend, in float opacity) { return (blendColorBurn(base, blend) * opacity + base * (1. - opacity));}
#endif

Use:

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

Check it on Github

#ifndef FNC_BLENDCOLORBURN
#define FNC_BLENDCOLORBURN
float blendColorBurn(in float base, in float blend) {
    return (blend == 0.)? blend: max((1. - ((1. - base ) / blend)), 0.);
}

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

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