/**
 *
 * ***** 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 "../TEX_util.h"


static bNodeSocketType inputs[]= {
	{ SOCK_VALUE, 1, "Hue",        0.0f, 0.0f, 0.0f, 0.0f, -0.5f, 0.5f },
	{ 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, "Factor",     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 outputs[]= {
	{ SOCK_RGBA, 0, "Color",       0.0f, 0.0f, 0.0f, 1.0f,  0.0f, 1.0f },
	{ -1, 0, "" }
};

static void do_hue_sat_fac(bNode *UNUSED(node), float *out, float hue, float sat, float val, float *in, float fac)
{
	if(fac != 0 && (hue != 0.5f || sat != 1 || val != 1)) {
		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 colorfn(float *out, TexParams *p, bNode *node, bNodeStack **in, short thread)
{	
	float hue = tex_input_value(in[0], p, thread);
	float sat = tex_input_value(in[1], p, thread);
	float val = tex_input_value(in[2], p, thread);
	float fac = tex_input_value(in[3], p, thread);
	
	float col[4];
	tex_input_rgba(col, in[4], p, thread);
	
	hue += 0.5f; /* [-.5, .5] -> [0, 1] */
	
	do_hue_sat_fac(node, out, hue, sat, val, col, fac);
	
	out[3] = col[3];
}

static void exec(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
{
	tex_output(node, in, out[0], &colorfn, data);
}

bNodeType tex_node_hue_sat= {
	/* *next,*prev */	NULL, NULL,
	/* type code   */	TEX_NODE_HUE_SAT,
	/* name        */	"Hue Saturation Value",
	/* width+range */	150, 80, 250,
	/* class+opts  */	NODE_CLASS_OP_COLOR, NODE_OPTIONS,
	/* input sock  */	inputs,
	/* output sock */	outputs,
	/* storage     */	"", 
	/* execfunc    */	exec,
	/* butfunc     */	NULL,
	/* initfunc    */	NULL,
	/* freestoragefunc    */	NULL,
	/* copystoragefunc    */	NULL,
	/* id          */	NULL
	
};