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


/* **************** SCALAR MATH ******************** */ 
static bNodeSocketTemplate inputs[]= { 
    { SOCK_FLOAT, 1, "Value", 0.5f, 0.5f, 0.5f, 1.0f, -100.0f, 100.0f, PROP_NONE}, 
    { SOCK_FLOAT, 1, "Value", 0.5f, 0.5f, 0.5f, 1.0f, -100.0f, 100.0f, PROP_NONE}, 
    { -1, 0, "" } 
};

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

static void valuefn(float *out, TexParams *p, bNode *node, bNodeStack **in, short thread)
{
    float in0 = tex_input_value(in[0], p, thread);
    float in1 = tex_input_value(in[1], p, thread);
    
    switch(node->custom1){ 
    
    case 0: /* Add */
        *out= in0 + in1; 
        break; 
    case 1: /* Subtract */
        *out= in0 - in1;
        break; 
    case 2: /* Multiply */
        *out= in0 * in1; 
        break; 
    case 3: /* Divide */
        {
            if(in1==0)  /* We don't want to divide by zero. */
                *out= 0.0;
            else
                *out= in0 / in1;
            }
        break;
    case 4: /* Sine */
        {
            *out= sin(in0);
        }
        break;
    case 5: /* Cosine */
        {
            *out= cos(in0);
        }
        break;
    case 6: /* Tangent */
        {
            *out= tan(in0);
        }
        break;
    case 7: /* Arc-Sine */
        {
            /* Can't do the impossible... */
            if( in0 <= 1 && in0 >= -1 )
                *out= asin(in0);
            else
                *out= 0.0;
        }
        break;
    case 8: /* Arc-Cosine */
        {
            /* Can't do the impossible... */
            if( in0 <= 1 && in0 >= -1 )
                *out= acos(in0);
            else
                *out= 0.0;
        }
        break;
    case 9: /* Arc-Tangent */
        {
            *out= atan(in0);
        }
        break;
    case 10: /* Power */
        {
            /* Only raise negative numbers by full integers */
            if( in0 >= 0 ) {
                out[0]= pow(in0, in1);
            } else {
                float y_mod_1 = fmod(in1, 1);
                if (y_mod_1 > 0.999f || y_mod_1 < 0.001f) {
                    *out = pow(in0, floor(in1 + 0.5f));
                } else {
                    *out = 0.0;
                }
            }
        }
        break;
    case 11: /* Logarithm */
        {
            /* Don't want any imaginary numbers... */
            if( in0 > 0  && in1 > 0 )
                *out= log(in0) / log(in1);
            else
                *out= 0.0;
        }
        break;
    case 12: /* Minimum */
        {
            if( in0 < in1 )
                *out= in0;
            else
                *out= in1;
        }
        break;
    case 13: /* Maximum */
        {
            if( in0 > in1 )
                *out= in0;
            else
                *out= in1;
        }
        break;
    case 14: /* Round */
        {
            *out= (in0<0)?(int)(in0 - 0.5f):(int)(in0 + 0.5f);
        }
        break; 
        
    case 15: /* Less Than */
        {
            if( in0 < in1 )
                *out= 1.0f;
            else
                *out= 0.0f;
        }
        break;
        
    case 16: /* Greater Than */
        {
            if( in0 > in1 )
                *out= 1.0f;
            else
                *out= 0.0f;
        }
        break;
        
    default:
        fprintf(stderr,
            "%s:%d: unhandeld value in switch statement: %d\n",
            __FILE__, __LINE__, node->custom1);
    } 
}

static void exec(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
{
    tex_output(node, in, out[0], &valuefn, data);
}

void register_node_type_tex_math(bNodeTreeType *ttype)
{
    static bNodeType ntype;
    
    node_type_base(ttype, &ntype, TEX_NODE_MATH, "Math", NODE_CLASS_CONVERTOR, NODE_OPTIONS);
    node_type_socket_templates(&ntype, inputs, outputs);
    node_type_size(&ntype, 120, 110, 160);
    node_type_label(&ntype, node_math_label);
    node_type_storage(&ntype, "node_math", NULL, NULL);
    node_type_exec(&ntype, exec);
    
    nodeRegisterType(ttype, &ntype);
}