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);
+}