CMP_normalize.c

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/*
 * $Id: CMP_normalize.c 35237 2011-02-27 20:13:22Z jesterking $
 *
 * ***** 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):  gsr b3d, and a very minor edit from Robert Holcomb 
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "../CMP_util.h"


/* **************** NORMALIZE single channel, useful for Z buffer ******************** */
static bNodeSocketType cmp_node_normalize_in[]= {
        {   SOCK_VALUE, 1, "Value",         1.0f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f},
        {   -1, 0, ""   }
};
static bNodeSocketType cmp_node_normalize_out[]= {
        {   SOCK_VALUE, 0, "Value",         1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
        {   -1, 0, ""   }
};

static void do_normalize(bNode *UNUSED(node), float *out, float *src, float *min, float *mult)
{
        float res;
        res = (src[0] - min[0]) * mult[0];
        if (res > 1.0f) {
                out[0] = 1.0f;
        }
        else if (res < 0.0f) {
                out[0] = 0.0f;
        }
        else {
                out[0] = res;
        }
}

/* The code below assumes all data is inside range +- this, and that input buffer is single channel */
#define BLENDER_ZMAX 10000.0f

static void node_composit_exec_normalize(void *UNUSED(data), bNode *node, bNodeStack **in, bNodeStack **out)
{
        /* stack order in: valbuf */
        /* stack order out: valbuf */
        if(out[0]->hasoutput==0) return;

        /* Input has no image buffer? Then pass the value */
        if(in[0]->data==NULL) {
                QUATCOPY(out[0]->vec, in[0]->vec);
        }
        else {
                float min = 1.0f+BLENDER_ZMAX;
                float max = -1.0f-BLENDER_ZMAX;
                float mult = 1.0f;
                float *val;
                /* make output size of input image */
                CompBuf *cbuf= in[0]->data;
                int tot= cbuf->x*cbuf->y;
                CompBuf *stackbuf= alloc_compbuf(cbuf->x, cbuf->y, CB_VAL, 1); /* allocs */

                for (val = cbuf->rect; tot; tot--, val++) {
                        if ((*val > max) && (*val <= BLENDER_ZMAX)) {
                                max = *val;
                        }
                        if ((*val < min) && (*val >= -BLENDER_ZMAX)) {
                                min = *val;
                        }
                }
                /* In the rare case of flat buffer, which would cause a divide by 0, just pass the input to the output */
                if ((max-min) != 0.0f) {
                        mult = 1.0f/(max-min);
                        composit3_pixel_processor(node, stackbuf, in[0]->data, in[0]->vec, NULL, &min, NULL, &mult, do_normalize, CB_VAL, CB_VAL, CB_VAL);
                } else {
                        memcpy(stackbuf->rect, cbuf->rect, sizeof(float) * cbuf->x * cbuf->y);
                }

                out[0]->data= stackbuf;
        }
}

void register_node_type_cmp_normalize(ListBase *lb)
{
        static bNodeType ntype;
        
        node_type_base(&ntype, CMP_NODE_NORMALIZE, "Normalize", NODE_CLASS_OP_VECTOR, NODE_OPTIONS,
                                   cmp_node_normalize_in, cmp_node_normalize_out);
        node_type_size(&ntype, 100, 60, 150);
        node_type_exec(&ntype, node_composit_exec_normalize);
        node_type_storage(&ntype, "TexMapping", NULL, NULL);
        
        nodeRegisterType(lb, &ntype);
}