node_shader_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_shader_util.h"


/* **************** Hue Saturation ******************** */
static bNodeSocketTemplate sh_node_hue_sat_in[]= {
    {   SOCK_FLOAT, 1, "Hue",           0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 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, "Fac",           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 sh_node_hue_sat_out[]= {
    {   SOCK_RGBA, 0, "Color"},
    {   -1, 0, ""   }
};

/* note: it would be possible to use CMP version for both nodes */
static void do_hue_sat_fac(bNode *UNUSED(node), float *out, float *hue, float *sat, float *val, float *in, float *fac)
{
    if(*fac!=0.0f && (*hue!=0.5f || *sat!=1.0f || *val!=1.0f)) {
        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;
        hsv[2]*= *val;
        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 node_shader_exec_hue_sat(void *UNUSED(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);
}


static int gpu_shader_hue_sat(GPUMaterial *mat, bNode *UNUSED(node), GPUNodeStack *in, GPUNodeStack *out)
{
    return GPU_stack_link(mat, "hue_sat", in, out);
}

void register_node_type_sh_hue_sat(bNodeTreeType *ttype)
{
    static bNodeType ntype;

    node_type_base(ttype, &ntype, SH_NODE_HUE_SAT, "Hue Saturation Value", NODE_CLASS_OP_COLOR, NODE_OPTIONS);
    node_type_compatibility(&ntype, NODE_OLD_SHADING|NODE_NEW_SHADING);
    node_type_socket_templates(&ntype, sh_node_hue_sat_in, sh_node_hue_sat_out);
    node_type_size(&ntype, 150, 80, 250);
    node_type_exec(&ntype, node_shader_exec_hue_sat);
    node_type_gpu(&ntype, gpu_shader_hue_sat);

    nodeRegisterType(ttype, &ntype);
}