diff options
Diffstat (limited to 'intern/cycles/kernel/osl/shaders/node_color.h')
-rw-r--r-- | intern/cycles/kernel/osl/shaders/node_color.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/intern/cycles/kernel/osl/shaders/node_color.h b/intern/cycles/kernel/osl/shaders/node_color.h index 388dd114e9a..06735f5b03d 100644 --- a/intern/cycles/kernel/osl/shaders/node_color.h +++ b/intern/cycles/kernel/osl/shaders/node_color.h @@ -148,3 +148,53 @@ color hsv_to_rgb(color hsv) return rgb; } + +color rgb_to_hsl(color rgb) +{ + float cmax, cmin, h, s, l; + + cmax = max(rgb[0], max(rgb[1], rgb[2])); + cmin = min(rgb[0], min(rgb[1], rgb[2])); + l = min(1.0, (cmax + cmin) / 2.0); + + if (cmax == cmin) { + h = s = 0.0; /* achromatic */ + } + else { + float cdelta = cmax - cmin; + s = l > 0.5 ? cdelta / (2.0 - cmax - cmin) : cdelta / (cmax + cmin); + if (cmax == rgb[0]) { + h = (rgb[1] - rgb[2]) / cdelta + (rgb[1] < rgb[2] ? 6.0 : 0.0); + } + else if (cmax == rgb[1]) { + h = (rgb[2] - rgb[0]) / cdelta + 2.0; + } + else { + h = (rgb[0] - rgb[1]) / cdelta + 4.0; + } + } + h /= 6.0; + + return color(h, s, l); +} + +color hsl_to_rgb(color hsl) +{ + float nr, ng, nb, chroma, h, s, l; + + h = hsl[0]; + s = hsl[1]; + l = hsl[2]; + + nr = abs(h * 6.0 - 3.0) - 1.0; + ng = 2.0 - abs(h * 6.0 - 2.0); + nb = 2.0 - abs(h * 6.0 - 4.0); + + nr = clamp(nr, 0.0, 1.0); + nb = clamp(nb, 0.0, 1.0); + ng = clamp(ng, 0.0, 1.0); + + chroma = (1.0 - abs(2.0 * l - 1.0)) * s; + + return color((nr - 0.5) * chroma + l, (ng - 0.5) * chroma + l, (nb - 0.5) * chroma + l); +} |