1 files changed, 125 insertions, 0 deletions
diff --git a/intern/cycles/kernel/shaders/node_color.h b/intern/cycles/kernel/shaders/node_color.h
new file mode 100644
index 00000000000..80786e4e369
--- /dev/null
+++ b/intern/cycles/kernel/shaders/node_color.h
@@ -0,0 +1,125 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/* Color Management */
+
+float color_srgb_to_scene_linear(float c)
+{
+	if (c < 0.04045)
+		return (c < 0.0) ? 0.0 : c * (1.0 / 12.92);
+	else
+		return pow((c + 0.055) * (1.0 / 1.055), 2.4);
+}
+
+float color_scene_linear_to_srgb(float c)
+{
+	if (c < 0.0031308)
+		return (c < 0.0) ? 0.0 : c * 12.92;
+	else
+		return 1.055 * pow(c, 1.0 / 2.4) - 0.055;
+}
+
+color color_srgb_to_scene_linear(color c)
+{
+	return color(
+		color_srgb_to_scene_linear(c[0]),
+		color_srgb_to_scene_linear(c[1]),
+		color_srgb_to_scene_linear(c[2]));
+}
+
+color color_scene_linear_to_srgb(color c)
+{
+	return color(
+		color_scene_linear_to_srgb(c[0]),
+		color_scene_linear_to_srgb(c[1]),
+		color_scene_linear_to_srgb(c[2]));
+}
+
+/* Color Operations */
+
+color rgb_to_hsv(color rgb)
+{
+	float cmax, cmin, h, s, v, cdelta;
+	color c;
+
+	cmax = max(rgb[0], max(rgb[1], rgb[2]));
+	cmin = min(rgb[0], min(rgb[1], rgb[2]));
+	cdelta = cmax - cmin;
+
+	v = cmax;
+
+	if (cmax != 0.0) {
+		s = cdelta / cmax;
+	}
+	else {
+		s = 0.0;
+		h = 0.0;
+	}
+
+	if (s == 0.0) {
+		h = 0.0;
+	}
+	else {
+		c = (color(cmax, cmax, cmax) - rgb) / cdelta;
+
+		if (rgb[0] == cmax) h = c[2] - c[1];
+		else if (rgb[1] == cmax) h = 2.0 + c[0] -  c[2];
+		else h = 4.0 + c[1] - c[0];
+
+		h /= 6.0;
+
+		if (h < 0.0)
+			h += 1.0;
+	}
+
+	return color(h, s, v);
+}
+
+color hsv_to_rgb(color hsv)
+{
+	float i, f, p, q, t, h, s, v;
+	color rgb;
+
+	h = hsv[0];
+	s = hsv[1];
+	v = hsv[2];
+
+	if (s == 0.0) {
+		rgb = color(v, v, v);
+	}
+	else {
+		if (h == 1.0)
+			h = 0.0;
+		
+		h *= 6.0;
+		i = floor(h);
+		f = h - i;
+		rgb = color(f, f, f);
+		p = v * (1.0 - s);
+		q = v * (1.0 - (s * f));
+		t = v * (1.0 - (s * (1.0 - f)));
+
+		if (i == 0.0) rgb = color(v, t, p);
+		else if (i == 1.0) rgb = color(q, v, p);
+		else if (i == 2.0) rgb = color(p, v, t);
+		else if (i == 3.0) rgb = color(p, q, v);
+		else if (i == 4.0) rgb = color(t, p, v);
+		else rgb = color(v, p, q);
+	}
+
+	return rgb;
+}
+