node_shader_squeeze.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) 2005 Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "node_shader_util.h"

/* **************** VALUE SQUEEZE ******************** */ 
static bNodeSocketTemplate sh_node_squeeze_in[]= { 
    { SOCK_FLOAT, 1, "Value", 0.0f, 0.0f, 0.0f, 0.0f, -100.0f, 100.0f, PROP_NONE}, 
    { SOCK_FLOAT, 1, "Width", 1.0f, 0.0f, 0.0f, 0.0f, -100.0f, 100.0f, PROP_NONE}, 
    { SOCK_FLOAT, 1, "Center", 0.0f, 0.0f, 0.0f, 0.0f, -100.0f, 100.0f, PROP_NONE}, 
    { -1, 0, "" } 
};

static bNodeSocketTemplate sh_node_squeeze_out[]= { 
    { SOCK_FLOAT, 0, "Value"}, 
    { -1, 0, "" } 
};

static void node_shader_exec_squeeze(void *UNUSED(data), bNode *UNUSED(node), bNodeStack **in, 
bNodeStack **out) 
{
    float vec[3];
    
    nodestack_get_vec(vec, SOCK_FLOAT, in[0]);
    nodestack_get_vec(vec+1, SOCK_FLOAT, in[1]);
    nodestack_get_vec(vec+2, SOCK_FLOAT, in[2]);

    out[0]->vec[0] = 1.0f / (1.0f + pow(2.71828183,-((vec[0]-vec[2])*vec[1]))) ;
}

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

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

    node_type_base(ttype, &ntype, SH_NODE_SQUEEZE, "Squeeze Value", NODE_CLASS_CONVERTOR, NODE_OPTIONS);
    node_type_compatibility(&ntype, NODE_OLD_SHADING);
    node_type_socket_templates(&ntype, sh_node_squeeze_in, sh_node_squeeze_out);
    node_type_size(&ntype, 120, 110, 160);
    node_type_storage(&ntype, "node_squeeze", NULL, NULL);
    node_type_exec(&ntype, node_shader_exec_squeeze);
    node_type_gpu(&ntype, gpu_shader_squeeze);

    nodeRegisterType(ttype, &ntype);
}