node_texture_hueSatVal.c

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/*
 * ***** 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 "node_texture_util.h"
#include "NOD_texture.h"


static bNodeSocketTemplate inputs[]= {
    { SOCK_FLOAT, 1, "Hue",        0.0f, 0.0f, 0.0f, 0.0f, -0.5f, 0.5f, PROP_NONE },
    { SOCK_FLOAT, 1, "Saturation", 1.0f, 0.0f, 0.0f, 0.0f,  0.0f, 2.0f, PROP_FACTOR },
    { SOCK_FLOAT, 1, "Value",      1.0f, 0.0f, 0.0f, 0.0f,  0.0f, 2.0f, PROP_FACTOR },
    { SOCK_FLOAT, 1, "Factor",     1.0f, 0.0f, 0.0f, 0.0f,  0.0f, 1.0f, PROP_FACTOR },
    { SOCK_RGBA,  1, "Color",      0.8f, 0.8f, 0.8f, 1.0f },
    { -1, 0, "" }
};
static bNodeSocketTemplate outputs[]= {
    { SOCK_RGBA, 0, "Color" },
    { -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]>1.0f) hsv[0]-=1.0f; else if(hsv[0]<0.0f) hsv[0]+= 1.0f;
        hsv[1]*= sat;
        if(hsv[1]>1.0f) hsv[1]= 1.0f; else if(hsv[1]<0.0f) hsv[1]= 0.0f;
        hsv[2]*= val;
        if(hsv[2]>1.0f) hsv[2]= 1.0f; else if(hsv[2]<0.0f) hsv[2]= 0.0f;
        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 {
        copy_v4_v4(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);
}

void register_node_type_tex_hue_sat(bNodeTreeType *ttype)
{
    static bNodeType ntype;
    
    node_type_base(ttype, &ntype, TEX_NODE_HUE_SAT, "Hue Saturation Value", NODE_CLASS_OP_COLOR, NODE_OPTIONS);
    node_type_socket_templates(&ntype, inputs, outputs);
    node_type_size(&ntype, 150, 80, 250);
    node_type_exec(&ntype, exec);
    
    nodeRegisterType(ttype, &ntype);
}