MOD_surface.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 by the Blender Foundation.
 * All rights reserved.
 *
 * Contributor(s): Daniel Dunbar
 *                 Ton Roosendaal,
 *                 Ben Batt,
 *                 Brecht Van Lommel,
 *                 Campbell Barton
 *
 * ***** END GPL LICENSE BLOCK *****
 *
 */

#include "DNA_scene_types.h"
#include "DNA_object_types.h"
#include "DNA_meshdata_types.h"

#include "BLI_math.h"
#include "BLI_utildefines.h"


#include "BKE_cdderivedmesh.h"

#include "MOD_modifiertypes.h"
#include "MOD_util.h"

#include "MEM_guardedalloc.h"


static void initData(ModifierData *md) 
{
    SurfaceModifierData *surmd = (SurfaceModifierData*) md;
    
    surmd->bvhtree = NULL;
}

static void freeData(ModifierData *md)
{
    SurfaceModifierData *surmd = (SurfaceModifierData*) md;
    
    if (surmd)
    {
        if(surmd->bvhtree) {
            free_bvhtree_from_mesh(surmd->bvhtree);
            MEM_freeN(surmd->bvhtree);
        }

        if(surmd->dm)
            surmd->dm->release(surmd->dm);

        if(surmd->x)
            MEM_freeN(surmd->x);
        
        if(surmd->v)
            MEM_freeN(surmd->v);

        surmd->bvhtree = NULL;
        surmd->dm = NULL;
    }
}

static int dependsOnTime(ModifierData *UNUSED(md))
{
    return 1;
}

static void deformVerts(ModifierData *md, Object *ob,
                        DerivedMesh *derivedData,
                        float (*vertexCos)[3],
                        int UNUSED(numVerts),
                        int UNUSED(useRenderParams),
                        int UNUSED(isFinalCalc))
{
    SurfaceModifierData *surmd = (SurfaceModifierData*) md;
    
    if(surmd->dm)
        surmd->dm->release(surmd->dm);

    /* if possible use/create DerivedMesh */
    if(derivedData) surmd->dm = CDDM_copy(derivedData);
    else surmd->dm = get_dm(ob, NULL, NULL, NULL, 0);
    
    if(!ob->pd)
    {
        printf("SurfaceModifier deformVerts: Should not happen!\n");
        return;
    }
    
    if(surmd->dm)
    {
        unsigned int numverts = 0, i = 0;
        int init = 0;
        float *vec;
        MVert *x, *v;

        CDDM_apply_vert_coords(surmd->dm, vertexCos);
        CDDM_calc_normals(surmd->dm);
        
        numverts = surmd->dm->getNumVerts ( surmd->dm );

        if(numverts != surmd->numverts || surmd->x == NULL || surmd->v == NULL || md->scene->r.cfra != surmd->cfra+1) {
            if(surmd->x) {
                MEM_freeN(surmd->x);
                surmd->x = NULL;
            }
            if(surmd->v) {
                MEM_freeN(surmd->v);
                surmd->v = NULL;
            }

            surmd->x = MEM_callocN(numverts * sizeof(MVert), "MVert");
            surmd->v = MEM_callocN(numverts * sizeof(MVert), "MVert");

            surmd->numverts = numverts;

            init = 1;
        }

        /* convert to global coordinates and calculate velocity */
        for(i = 0, x = surmd->x, v = surmd->v; i<numverts; i++, x++, v++) {
            vec = CDDM_get_vert(surmd->dm, i)->co;
            mul_m4_v3(ob->obmat, vec);

            if(init)
                v->co[0] = v->co[1] = v->co[2] = 0.0f;
            else
                sub_v3_v3v3(v->co, vec, x->co);
            
            copy_v3_v3(x->co, vec);
        }

        surmd->cfra = md->scene->r.cfra;

        if(surmd->bvhtree)
            free_bvhtree_from_mesh(surmd->bvhtree);
        else
            surmd->bvhtree = MEM_callocN(sizeof(BVHTreeFromMesh), "BVHTreeFromMesh");

        if(surmd->dm->getNumFaces(surmd->dm))
            bvhtree_from_mesh_faces(surmd->bvhtree, surmd->dm, 0.0, 2, 6);
        else
            bvhtree_from_mesh_edges(surmd->bvhtree, surmd->dm, 0.0, 2, 6);
    }
}


ModifierTypeInfo modifierType_Surface = {
    /* name */              "Surface",
    /* structName */        "SurfaceModifierData",
    /* structSize */        sizeof(SurfaceModifierData),
    /* type */              eModifierTypeType_OnlyDeform,
    /* flags */             eModifierTypeFlag_AcceptsMesh
                            | eModifierTypeFlag_NoUserAdd,

    /* copyData */          NULL,
    /* deformVerts */       deformVerts,
    /* deformMatrices */    NULL,
    /* deformVertsEM */     NULL,
    /* deformMatricesEM */  NULL,
    /* applyModifier */     NULL,
    /* applyModifierEM */   NULL,
    /* initData */          initData,
    /* requiredDataMask */  NULL,
    /* freeData */          freeData,
    /* isDisabled */        NULL,
    /* updateDepgraph */    NULL,
    /* dependsOnTime */     dependsOnTime,
    /* dependsOnNormals */  NULL,
    /* foreachObjectLink */ NULL,
    /* foreachIDLink */     NULL,
    /* foreachTexLink */    NULL,
};