BME_Customdata.c

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/*
 * BME_customdata.c    jan 2007
 *
 *  Custom Data functions for Bmesh
 *
 *
 * ***** 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) 2004 Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): Geoffrey Bantle, Brecht Van Lommel, Ben Batt
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <string.h>

#include "MEM_guardedalloc.h"
#include "BKE_bmeshCustomData.h"
#include "bmesh_private.h"

/********************* Layer type information **********************/
typedef struct BME_LayerTypeInfo {
    int size;
    const char *defaultname;
    void (*copy)(const void *source, void *dest, int count);
    void (*free)(void *data, int count, int size);
    void (*interp)(void **sources, float *weights, float *sub_weights, int count, void *dest);
    void (*set_default)(void *data, int count);
} BME_LayerTypeInfo;
const BME_LayerTypeInfo BMELAYERTYPEINFO[BME_CD_NUMTYPES] = {
    {sizeof(BME_facetex), "TexFace", NULL, NULL, NULL, NULL},
    {sizeof(BME_looptex), "UV", NULL, NULL, NULL, NULL},
    {sizeof(BME_loopcol), "VCol", NULL, NULL, NULL, NULL},
    {sizeof(BME_DeformVert), "Group", NULL, NULL, NULL, NULL}
};
static const BME_LayerTypeInfo *BME_layerType_getInfo(int type)
{
    if(type < 0 || type >= CD_NUMTYPES) return NULL;

    return &BMELAYERTYPEINFO[type];
}
void BME_CD_Create(BME_CustomData *data, BME_CustomDataInit *init, int initalloc)
{
    int i, j, offset=0;
    const BME_LayerTypeInfo *info;
    
    /*initialize data members*/
    data->layers = NULL;
    data->pool = NULL;
    data->totlayer = 0;
    data->totsize = 0;

    /*first count how many layers to alloc*/
    for(i=0; i < BME_CD_NUMTYPES; i++){
        info = BME_layerType_getInfo(i);
        data->totlayer += init->layout[i];
        data->totsize  += (init->layout[i] * info->size);
    }
    /*alloc our layers*/
    if(data->totlayer){
        /*alloc memory*/
        data->layers = MEM_callocN(sizeof(BME_CustomDataLayer)*data->totlayer, "BMesh Custom Data Layers");
        data->pool = BLI_mempool_create(data->totsize, initalloc, initalloc, FALSE, FALSE);
        /*initialize layer data*/
        for(i=0; i < BME_CD_NUMTYPES; i++){
            if(init->layout[i]){
                info = BME_layerType_getInfo(i);
                for(j=0; j < init->layout[i]; j++){
                    if(j==0) data->layers[j+i].active = init->active[i];
                    data->layers[j+i].type = i;
                    data->layers[j+i].offset = offset;  
                    strcpy(data->layers[j+i].name, &(init->nametemplate[j+i]));
                    offset += info->size;
                }
            }
        }
    }
}

void BME_CD_Free(BME_CustomData *data)
{
    if(data->pool) BLI_mempool_destroy(data->pool);
}

/*Block level ops*/
void BME_CD_free_block(BME_CustomData *data, void **block)
{
    const BME_LayerTypeInfo *typeInfo;
    int i;

    if(!*block) return;
    for(i = 0; i < data->totlayer; ++i) {
        typeInfo = BME_layerType_getInfo(data->layers[i].type);
        if(typeInfo->free) {
            int offset = data->layers[i].offset;
            typeInfo->free((char*)*block + offset, 1, typeInfo->size);
        }
    }
    BLI_mempool_free(data->pool, *block);
    *block = NULL;
}


static void BME_CD_alloc_block(BME_CustomData *data, void **block)
{   
    
    if (*block) BME_CD_free_block(data, block); //if we copy layers that have their own free functions like deformverts
    
    if (data->totsize > 0)
        *block = BLI_mempool_alloc(data->pool); 
    else
        *block = NULL;
}

void BME_CD_copy_data(const BME_CustomData *source, BME_CustomData *dest,
                            void *src_block, void **dest_block)
{
    const BME_LayerTypeInfo *typeInfo;
    int dest_i, src_i;

    if (!*dest_block) /*for addXXXlist functions!*/
        BME_CD_alloc_block(dest, dest_block);
    
    /* copies a layer at a time */
    dest_i = 0;
    for(src_i = 0; src_i < source->totlayer; ++src_i) {

        /* find the first dest layer with type >= the source type
         * (this should work because layers are ordered by type)
         */
        while(dest_i < dest->totlayer
              && dest->layers[dest_i].type < source->layers[src_i].type)
            ++dest_i;

        /* if there are no more dest layers, we're done */
        if(dest_i >= dest->totlayer) return;

        /* if we found a matching layer, copy the data */
        if(dest->layers[dest_i].type == source->layers[src_i].type &&
            strcmp(dest->layers[dest_i].name, source->layers[src_i].name) == 0) {
            char *src_data = (char*)src_block + source->layers[src_i].offset;
            char *dest_data = (char*)*dest_block + dest->layers[dest_i].offset;

            typeInfo = BME_layerType_getInfo(source->layers[src_i].type);

            if(typeInfo->copy)
                typeInfo->copy(src_data, dest_data, 1);
            else
                memcpy(dest_data, src_data, typeInfo->size);

            /* if there are multiple source & dest layers of the same type,
             * we don't want to copy all source layers to the same dest, so
             * increment dest_i
             */
            ++dest_i;
        }
    }
}
void BME_CD_set_default(BME_CustomData *data, void **block)
{
    const BME_LayerTypeInfo *typeInfo;
    int i;

    if (!*block)
        BME_CD_alloc_block(data, block); //for addXXXlist functions...

    for(i = 0; i < data->totlayer; ++i) {
        int offset = data->layers[i].offset;

        typeInfo = BME_layerType_getInfo(data->layers[i].type);

        if(typeInfo->set_default)
            typeInfo->set_default((char*)*block + offset, 1);
    }
}