HSV Color Node for Cycles

.........................
note, the OSL code has a problem.
In the original node the input and output nodes have the same name (Color).
So this will be fixed here once Brecht come up with a nice autorenaming (or we do a doversion patch) for that.

1 files changed, 131 insertions, 0 deletions

diff --git a/intern/cycles/kernel/svm/svm_hsv.h b/intern/cycles/kernel/svm/svm_hsv.h
new file mode 100644
index 00000000000..fc927f297f5
--- /dev/null
+++ b/intern/cycles/kernel/svm/svm_hsv.h
@@ -0,0 +1,131 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * 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.
+ */
+
+#ifndef __SVM_HSV_H__
+#define __SVM_HSV_H__
+
+CCL_NAMESPACE_BEGIN
+
+__device float3 rgb_to_hsv(float3 rgb)
+{
+	float cmax, cmin, h, s, v, cdelta;
+	float3 c;
+
+	cmax = fmaxf(rgb.x, fmaxf(rgb.y, rgb.z));
+	cmin = min(rgb.x, min(rgb.y, rgb.z));
+	cdelta = cmax - cmin;
+
+	v = cmax;
+
+	if(cmax != 0.0f) {
+		s = cdelta/cmax;
+	}
+	else {
+		s = 0.0f;
+		h = 0.0f;
+	}
+
+	if(s == 0.0f) {
+		h = 0.0f;
+	}
+	else {
+		float3 cmax3 = make_float3(cmax, cmax, cmax);
+		c = (cmax3 - rgb)/cdelta;
+
+		if(rgb.x == cmax) h = c.z - c.y;
+		else if(rgb.y == cmax) h = 2.0f + c.x -  c.z;
+		else h = 4.0f + c.y - c.x;
+
+		h /= 6.0f;
+
+		if(h < 0.0f)
+			h += 1.0f;
+	}
+
+	return make_float3(h, s, v);
+}
+
+__device float3 hsv_to_rgb(float3 hsv)
+{
+	float i, f, p, q, t, h, s, v;
+	float3 rgb;
+
+	h = hsv.x;
+	s = hsv.y;
+	v = hsv.z;
+
+	if(s==0.0f) {
+		rgb = make_float3(v, v, v);
+	}
+	else {
+		if(h==1.0f)
+			h = 0.0f;
+		
+		h *= 6.0f;
+		i = floor(h);
+		f = h - i;
+		rgb = make_float3(f, f, f);
+		p = v*(1.0f-s);
+		q = v*(1.0f-(s*f));
+		t = v*(1.0f-(s*(1.0f-f)));
+		
+		if(i == 0.0f) rgb = make_float3(v, t, p);
+		else if(i == 1.0f) rgb = make_float3(q, v, p);
+		else if(i == 2.0f) rgb = make_float3(p, v, t);
+		else if(i == 3.0f) rgb = make_float3(p, q, v);
+		else if(i == 4.0f) rgb = make_float3(t, p, v);
+		else rgb = make_float3(v, p, q);
+	}
+
+	return rgb;
+}
+
+__device void svm_node_hsv(KernelGlobals *kg, ShaderData *sd, float *stack, uint in_color_offset, uint fac_offset, uint out_color_offset, int *offset)
+{
+	/* read extra data */
+	uint4 node1 = read_node(kg, offset);
+
+	float fac = stack_load_float(stack, fac_offset);
+	float3 in_color = stack_load_float3(stack, in_color_offset);
+	float3 color = in_color;
+
+	float hue = stack_load_float(stack, node1.y);
+	float sat = stack_load_float(stack, node1.z);
+	float val = stack_load_float(stack, node1.w);
+
+	color = rgb_to_hsv(color);
+
+	color.x += hue - 0.5f;
+	color.x = fmod(color.x, 1.0f);
+	color.y *= sat;
+	color.z *= val;
+
+	color = hsv_to_rgb(color);
+
+	color.x = fac*color.x + (1.0f - fac)*in_color.x;
+	color.y = fac*color.y + (1.0f - fac)*in_color.y;
+	color.z = fac*color.z + (1.0f - fac)*in_color.z;
+
+	if (stack_valid(out_color_offset))
+		stack_store_float3(stack, out_color_offset, color);
+}
+
+CCL_NAMESPACE_END
+
+#endif /* __SVM_HSV_H__ */
+