SHD_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 "../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 *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 {
                QUATCOPY(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(ListBase *lb)
{
        static bNodeType ntype;

        node_type_base(&ntype, SH_NODE_HUE_SAT, "Hue Saturation Value", NODE_CLASS_OP_COLOR, NODE_OPTIONS,
                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(lb, &ntype);
}