node_shader_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): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "node_shader_util.h"


/* **************** SCALAR MATH ******************** */ 
static bNodeSocketTemplate sh_node_math_in[]= { 
    { 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 sh_node_math_out[]= { 
    { SOCK_FLOAT, 0, "Value"}, 
    { -1, 0, "" } 
};

static void node_shader_exec_math(void *UNUSED(data), bNode *node, bNodeStack **in, 
bNodeStack **out) 
{
    switch(node->custom1){ 
    
    case 0: /* Add */
        out[0]->vec[0]= in[0]->vec[0] + in[1]->vec[0]; 
        break; 
    case 1: /* Subtract */
        out[0]->vec[0]= in[0]->vec[0] - in[1]->vec[0];
        break; 
    case 2: /* Multiply */
        out[0]->vec[0]= in[0]->vec[0] * in[1]->vec[0]; 
        break; 
    case 3: /* Divide */
        {
            if(in[1]->vec[0]==0)    /* We don't want to divide by zero. */
                out[0]->vec[0]= 0.0;
            else
                out[0]->vec[0]= in[0]->vec[0] / in[1]->vec[0];
            }
        break;
    case 4: /* Sine */
        {
            if(in[0]->hasinput || !in[1]->hasinput)  /* This one only takes one input, so we've got to choose. */
                out[0]->vec[0]= sin(in[0]->vec[0]);
            else
                out[0]->vec[0]= sin(in[1]->vec[0]);
        }
        break;
    case 5: /* Cosine */
        {
            if(in[0]->hasinput || !in[1]->hasinput)  /* This one only takes one input, so we've got to choose. */   
                out[0]->vec[0]= cos(in[0]->vec[0]);
            else
                out[0]->vec[0]= cos(in[1]->vec[0]);
        }
        break;
    case 6: /* Tangent */
        {
            if(in[0]->hasinput || !in[1]->hasinput)  /* This one only takes one input, so we've got to choose. */   
                out[0]->vec[0]= tan(in[0]->vec[0]);
            else
                out[0]->vec[0]= tan(in[1]->vec[0]);
        }
        break;
    case 7: /* Arc-Sine */
        {
            if(in[0]->hasinput || !in[1]->hasinput) { /* This one only takes one input, so we've got to choose. */
                /* Can't do the impossible... */
                if( in[0]->vec[0] <= 1 && in[0]->vec[0] >= -1 )
                    out[0]->vec[0]= asin(in[0]->vec[0]);
                else
                    out[0]->vec[0]= 0.0;
            }
            else {
                /* Can't do the impossible... */
                if( in[1]->vec[0] <= 1 && in[1]->vec[0] >= -1 )
                    out[0]->vec[0]= asin(in[1]->vec[0]);
                else
                    out[0]->vec[0]= 0.0;
            }
        }
        break;
    case 8: /* Arc-Cosine */
        {
            if(in[0]->hasinput || !in[1]->hasinput) { /* This one only takes one input, so we've got to choose. */
                /* Can't do the impossible... */
                if( in[0]->vec[0] <= 1 && in[0]->vec[0] >= -1 )
                    out[0]->vec[0]= acos(in[0]->vec[0]);
                else
                    out[0]->vec[0]= 0.0;
            }
            else {
                /* Can't do the impossible... */
                if( in[1]->vec[0] <= 1 && in[1]->vec[0] >= -1 )
                    out[0]->vec[0]= acos(in[1]->vec[0]);
                else
                    out[0]->vec[0]= 0.0;
            }
        }
        break;
    case 9: /* Arc-Tangent */
        {
            if(in[0]->hasinput || !in[1]->hasinput) /* This one only takes one input, so we've got to choose. */
                out[0]->vec[0]= atan(in[0]->vec[0]);
            else
                out[0]->vec[0]= atan(in[1]->vec[0]);
        }
        break;
    case 10: /* Power */
        {
            /* Don't want any imaginary numbers... */
            if( in[0]->vec[0] >= 0 )
                out[0]->vec[0]= pow(in[0]->vec[0], in[1]->vec[0]);
            else
                out[0]->vec[0]= 0.0;
        }
        break;
    case 11: /* Logarithm */
        {
            /* Don't want any imaginary numbers... */
            if( in[0]->vec[0] > 0  && in[1]->vec[0] > 0 )
                out[0]->vec[0]= log(in[0]->vec[0]) / log(in[1]->vec[0]);
            else
                out[0]->vec[0]= 0.0;
        }
        break;
    case 12: /* Minimum */
        {
            if( in[0]->vec[0] < in[1]->vec[0] )
                out[0]->vec[0]= in[0]->vec[0];
            else
                out[0]->vec[0]= in[1]->vec[0];
        }
        break;
    case 13: /* Maximum */
        {
            if( in[0]->vec[0] > in[1]->vec[0] )
                out[0]->vec[0]= in[0]->vec[0];
            else
                out[0]->vec[0]= in[1]->vec[0];
        }
        break;
    case 14: /* Round */
        {
            if(in[0]->hasinput || !in[1]->hasinput) /* This one only takes one input, so we've got to choose. */
                out[0]->vec[0]= (in[0]->vec[0]<0)?(int)(in[0]->vec[0] - 0.5f):(int)(in[0]->vec[0] + 0.5f);
            else
                out[0]->vec[0]= (in[1]->vec[0]<0)?(int)(in[1]->vec[0] - 0.5f):(int)(in[1]->vec[0] + 0.5f);
        }
        break;
    case 15: /* Less Than */
        {
            if( in[0]->vec[0] < in[1]->vec[0] )
                out[0]->vec[0]= 1.0f;
            else
                out[0]->vec[0]= 0.0f;
        }
        break;
    case 16: /* Greater Than */
        {
            if( in[0]->vec[0] > in[1]->vec[0] )
                out[0]->vec[0]= 1.0f;
            else
                out[0]->vec[0]= 0.0f;
        }
        break;
    } 
}

static int gpu_shader_math(GPUMaterial *mat, bNode *node, GPUNodeStack *in, GPUNodeStack *out)
{
    static const char *names[] = {"math_add", "math_subtract", "math_multiply",
        "math_divide", "math_sine", "math_cosine", "math_tangent", "math_asin",
        "math_acos", "math_atan", "math_pow", "math_log", "math_min", "math_max",
        "math_round", "math_less_than", "math_greater_than"};

    switch (node->custom1) {
        case 0:
        case 1:
        case 2:
        case 3:
        case 10:
        case 11:
        case 12:
        case 13:
        case 15:
        case 16:
            GPU_stack_link(mat, names[node->custom1], NULL, out,
                GPU_socket(&in[0]), GPU_socket(&in[1]));
            break;
        case 4:
        case 5:
        case 6:
        case 7:
        case 8:
        case 9:
        case 14:
            if(in[0].hasinput || !in[1].hasinput)
                GPU_stack_link(mat, names[node->custom1], NULL, out, GPU_socket(&in[0]));
            else
                GPU_stack_link(mat, names[node->custom1], NULL, out, GPU_socket(&in[1]));
            break;
        default:
            return 0;
    }
    
    return 1;
}

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

    node_type_base(ttype, &ntype, SH_NODE_MATH, "Math", NODE_CLASS_CONVERTOR, NODE_OPTIONS);
    node_type_compatibility(&ntype, NODE_OLD_SHADING|NODE_NEW_SHADING);
    node_type_socket_templates(&ntype, sh_node_math_in, sh_node_math_out);
    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, node_shader_exec_math);
    node_type_gpu(&ntype, gpu_shader_math);

    nodeRegisterType(ttype, &ntype);
}