lygia/v1.1.6/color/blend/subtract)Photoshop Soft Light blend mode mplementations sourced from this article on https://mouaif.wordpress.com/2009/01/05/photoshop-math-with-glsl-shaders/
Use:
blendSubtract(<float|vec3> base, <float|vec3> blend [, <float> opacity])
#ifndef FNC_BLENDSUBTRACT
#define FNC_BLENDSUBTRACT
float blendSubtract(in float base, in float blend) {
return max(base + blend - 1., 0.);
}
vec3 blendSubtract(in vec3 base, in vec3 blend) {
return max(base + blend - vec3(1.), vec3(0.));
}
vec3 blendSubtract(in vec3 base, in vec3 blend, in float opacity) {
return (blendSubtract(base, blend) * opacity + base * (1. - opacity));
}
#endif
Use:
blendSubtract(<float|float3> base, <float|float3> blend [, <float> opacity])
#ifndef FNC_BLENDSUBTRACT
#define FNC_BLENDSUBTRACT
float blendSubtract(in float base, in float blend) {
return max(base + blend - 1., 0.);
}
float3 blendSubtract(in float3 base, in float3 blend) {
return max(base + blend - float3(1., 1., 1.), float3(0., 0., 0.));
}
float3 blendSubtract(in float3 base, in float3 blend, in float opacity) {
return (blendSubtract(base, blend) * opacity + base * (1. - opacity));
}
#endif
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