node_texture_rotate.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): Robin Allen
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <math.h>

#include "node_texture_util.h"
#include "NOD_texture.h"

static bNodeSocketTemplate inputs[]= { 
    { SOCK_RGBA, 1, "Color", 0.0f, 0.0f, 0.0f, 1.0f},
    { SOCK_FLOAT, 1, "Turns",   0.0f, 0.0f, 0.0f, 0.0f,  -1.0f, 1.0f, PROP_NONE },
    { SOCK_VECTOR, 1, "Axis",   0.0f, 0.0f, 1.0f, 0.0f,  -1.0f, 1.0f, PROP_DIRECTION },
    { -1, 0, "" } 
};

static bNodeSocketTemplate outputs[]= { 
    { SOCK_RGBA, 0, "Color"}, 
    { -1, 0, "" } 
};

static void rotate(float new_co[3], float a, float ax[3], float co[3])
{
    float para[3];
    float perp[3];
    float cp[3];
    
    float cos_a = cos(a * (float)(2*M_PI));
    float sin_a = sin(a * (float)(2*M_PI));
    
    // x' = xcosa + n(n.x)(1-cosa) + (x*n)sina
    
    mul_v3_v3fl(perp, co, cos_a);
    mul_v3_v3fl(para, ax, dot_v3v3(co, ax)*(1 - cos_a));
    
    cross_v3_v3v3(cp, ax, co);
    mul_v3_fl(cp, sin_a);
    
    new_co[0] = para[0] + perp[0] + cp[0];
    new_co[1] = para[1] + perp[1] + cp[1];
    new_co[2] = para[2] + perp[2] + cp[2];
}

static void colorfn(float *out, TexParams *p, bNode *UNUSED(node), bNodeStack **in, short thread)
{
    float new_co[3], new_dxt[3], new_dyt[3], a, ax[3];
    
    a= tex_input_value(in[1], p, thread);
    tex_input_vec(ax, in[2], p, thread);

    rotate(new_co, a, ax, p->co);
    if (p->osatex) {
        rotate(new_dxt, a, ax, p->dxt);
        rotate(new_dyt, a, ax, p->dyt);
    }
    
    {
        TexParams np = *p;
        np.co = new_co;
        np.dxt = new_dxt;
        np.dyt = new_dyt;
        tex_input_rgba(out, in[0], &np, thread);
    }
}
static void exec(void *data, bNode *node, bNodeStack **in, bNodeStack **out) 
{
    tex_output(node, in, out[0], &colorfn, data);
}

void register_node_type_tex_rotate(bNodeTreeType *ttype)
{
    static bNodeType ntype;
    
    node_type_base(ttype, &ntype, TEX_NODE_ROTATE, "Rotate", NODE_CLASS_DISTORT, NODE_OPTIONS);
    node_type_socket_templates(&ntype, inputs, outputs);
    node_type_size(&ntype, 140, 100, 320);
    node_type_exec(&ntype, exec);
    
    nodeRegisterType(ttype, &ntype);
}