Hue Saturation Value node - port to material node system

This commit ports Hue Saturation Value node to the material node system.
Unlike in composite version, each value is an input. Composite node version
will be updated later to use the same scheme.

source/blender/blenkernel/BKE_node.h

@@ -208,6 +208,7 @@ struct ShadeResult;
 #define SH_NODE_INVERT		119
 #define SH_NODE_SEPRGB		120
 #define SH_NODE_COMBRGB		121
+#define SH_NODE_HUE_SAT		122
 
 
 /* custom defines options for Material node */

source/blender/blenkernel/intern/node.c

@@ -2391,6 +2391,7 @@ static void registerShaderNodes(ListBase *ntypelist)
 	nodeRegisterType(ntypelist, &sh_node_invert);
 	nodeRegisterType(ntypelist, &sh_node_seprgb);
 	nodeRegisterType(ntypelist, &sh_node_combrgb);
+	nodeRegisterType(ntypelist, &sh_node_hue_sat);
 }
 
 void init_nodesystem(void) 

source/blender/nodes/SHD_node.h

@@ -60,6 +60,7 @@ extern bNodeType sh_node_material_ext;
 extern bNodeType sh_node_invert;
 extern bNodeType sh_node_seprgb;
 extern bNodeType sh_node_combrgb;
+extern bNodeType sh_node_hue_sat;
 
 
 #endif

source/blender/nodes/intern/SHD_nodes/SHD_hueSatVal.c

@@ -0,0 +1,94 @@
+/**
+ *
+ *
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The Original Code is Copyright (C) 2006 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): Juho Vepsäläinen
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#include "../SHD_util.h"
+
+
+/* **************** Hue Saturation ******************** */
+static bNodeSocketType sh_node_hue_sat_in[]= {
+	{	SOCK_VALUE, 1, "Hue",			0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
+	{	SOCK_VALUE, 1, "Saturation",		1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 2.0f},
+	{	SOCK_VALUE, 1, "Value",			1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 2.0f},
+	{	SOCK_VALUE, 1, "Fac",			1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
+	{	SOCK_RGBA, 1, "Color",			0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f},
+	{	-1, 0, ""	}
+};
+static bNodeSocketType sh_node_hue_sat_out[]= {
+	{	SOCK_RGBA, 0, "Color",			0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
+	{	-1, 0, ""	}
+};
+
+/* note: it would be possible to use CMP version for both nodes */
+static void do_hue_sat_fac(bNode *node, float *out, float *hue, float *sat, float *val, float *in, float *fac)
+{
+	if(*fac!=0.0f && (*hue!=0.5f || *sat!=1.0 || *val!=1.0)) {
+		float col[3], hsv[3], mfac= 1.0f - *fac;
+		
+		rgb_to_hsv(in[0], in[1], in[2], hsv, hsv+1, hsv+2);
+		hsv[0]+= (*hue - 0.5f);
+		if(hsv[0]>1.0) hsv[0]-=1.0; else if(hsv[0]<0.0) hsv[0]+= 1.0;
+		hsv[1]*= *sat;
+		if(hsv[1]>1.0) hsv[1]= 1.0; else if(hsv[1]<0.0) hsv[1]= 0.0;
+		hsv[2]*= *val;
+		if(hsv[2]>1.0) hsv[2]= 1.0; else if(hsv[2]<0.0) hsv[2]= 0.0;
+		hsv_to_rgb(hsv[0], hsv[1], hsv[2], col, col+1, col+2);
+		
+		out[0]= mfac*in[0] + *fac*col[0];
+		out[1]= mfac*in[1] + *fac*col[1];
+		out[2]= mfac*in[2] + *fac*col[2];
+	}
+	else {
+		QUATCOPY(out, in);
+	}
+}
+
+static void node_shader_exec_hue_sat(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
+{	
+	do_hue_sat_fac(node, out[0]->vec, in[0]->vec, in[1]->vec, in[2]->vec, in[4]->vec, in[3]->vec);
+}
+
+bNodeType sh_node_hue_sat= {
+	/* *next,*prev */	NULL, NULL,
+	/* type code   */	SH_NODE_HUE_SAT,
+	/* name        */	"Hue Saturation Value",
+	/* width+range */	150, 80, 250,
+	/* class+opts  */	NODE_CLASS_OP_COLOR, NODE_OPTIONS,
+	/* input sock  */	sh_node_hue_sat_in,
+	/* output sock */	sh_node_hue_sat_out,
+	/* storage     */	"", 
+	/* execfunc    */	node_shader_exec_hue_sat,
+	/* butfunc     */	NULL,
+	/* initfunc    */	NULL,
+	/* freestoragefunc    */	NULL,
+	/* copystoragefunc    */	NULL,
+	/* id          */	NULL
+	
+};
+
+