MOD_surface.c

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/*
* $Id: MOD_surface.c 35362 2011-03-05 10:29:10Z campbellbarton $
*
* ***** 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,
};