BL_ShapeDeformer.cpp

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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) 2001-2002 by NaN Holding BV.
 * All rights reserved.
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 * The Original Code is: all of this file.
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 * ***** END GPL LICENSE BLOCK *****
 */

#if defined(WIN32) && !defined(FREE_WINDOWS)
#pragma warning (disable : 4786)
#endif //WIN32

#include "MEM_guardedalloc.h"
#include "BL_ShapeDeformer.h"
#include "CTR_Map.h"
#include "STR_HashedString.h"
#include "RAS_IPolygonMaterial.h"
#include "RAS_MeshObject.h"

//#include "BL_ArmatureController.h"
#include "DNA_anim_types.h"
#include "DNA_armature_types.h"
#include "DNA_action_types.h"
#include "DNA_key_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BKE_armature.h"
#include "BKE_action.h"
#include "BKE_key.h"
#include "BKE_ipo.h"
#include "MT_Point3.h"

extern "C"{
    #include "BKE_lattice.h"
    #include "BKE_animsys.h"
}
 

#include "BLI_blenlib.h"
#include "BLI_math.h"

#define __NLA_DEFNORMALS
//#undef __NLA_DEFNORMALS

BL_ShapeDeformer::BL_ShapeDeformer(BL_DeformableGameObject *gameobj,
                                   Object *bmeshobj,
                                   RAS_MeshObject *mesh)
    :
      BL_SkinDeformer(gameobj,bmeshobj, mesh),
      m_useShapeDrivers(false),
      m_lastShapeUpdate(-1)
{
    m_key = m_bmesh->key;
    m_bmesh->key = copy_key(m_key);
};

/* this second constructor is needed for making a mesh deformable on the fly. */
BL_ShapeDeformer::BL_ShapeDeformer(BL_DeformableGameObject *gameobj,
                Object *bmeshobj_old,
                Object *bmeshobj_new,
                RAS_MeshObject *mesh,
                bool release_object,
                bool recalc_normal,
                BL_ArmatureObject* arma)
                :
                    BL_SkinDeformer(gameobj, bmeshobj_old, bmeshobj_new, mesh, release_object, recalc_normal, arma),
                    m_useShapeDrivers(false),
                    m_lastShapeUpdate(-1)
{
    m_key = m_bmesh->key;
    m_bmesh->key = copy_key(m_key);
};

BL_ShapeDeformer::~BL_ShapeDeformer()
{
    if (m_key && m_bmesh->key)
    {
        free_key(m_bmesh->key);
        m_bmesh->key = m_key;
    }
};

RAS_Deformer *BL_ShapeDeformer::GetReplica()
{
    BL_ShapeDeformer *result;

    result = new BL_ShapeDeformer(*this);
    result->ProcessReplica();
    return result;
}

void BL_ShapeDeformer::ProcessReplica()
{
    BL_SkinDeformer::ProcessReplica();
    m_lastShapeUpdate = -1;
}

bool BL_ShapeDeformer::LoadShapeDrivers(Object* arma)
{
    // This used to check if we had drivers from this armature,
    // now we just assume we want to use shape drivers
    // and let the animsys handle things.
    m_useShapeDrivers = true;

    return true;
}

bool BL_ShapeDeformer::ExecuteShapeDrivers(void)
{
    if (m_useShapeDrivers && PoseUpdated()) {
        // the shape drivers use the bone matrix as input. Must 
        // update the matrix now
        m_armobj->ApplyPose();

        // We don't need an actual time, just use 0
        BKE_animsys_evaluate_animdata(NULL, &GetKey()->id, GetKey()->adt, 0.f, ADT_RECALC_DRIVERS);

        ForceUpdate();
        m_armobj->RestorePose();
        m_bDynamic = true;
        return true;
    }
    return false;
}

bool BL_ShapeDeformer::Update(void)
{
    bool bShapeUpdate = false;
    bool bSkinUpdate = false;

    ExecuteShapeDrivers();

    /* See if the object shape has changed */
    if (m_lastShapeUpdate != m_gameobj->GetLastFrame()) {
        /* the key coefficient have been set already, we just need to blend the keys */
        Object* blendobj = m_gameobj->GetBlendObject();
        
        // make sure the vertex weight cache is in line with this object
        m_pMeshObject->CheckWeightCache(blendobj);

        /* we will blend the key directly in m_transverts array: it is used by armature as the start position */
        /* m_bmesh->key can be NULL in case of Modifier deformer */
        if (m_bmesh->key) {
            /* store verts locally */
            VerifyStorage();

            do_rel_key(0, m_bmesh->totvert, m_bmesh->totvert, (char *)(float *)m_transverts, m_bmesh->key, NULL, 0); /* last arg is ignored */
            m_bDynamic = true;
        }

        // Don't release the weight array as in Blender, it will most likely be reusable on next frame 
        // The weight array are ultimately deleted when the skin mesh is destroyed
           
        /* Update the current frame */
        m_lastShapeUpdate=m_gameobj->GetLastFrame();

        // As we have changed, the mesh, the skin deformer must update as well.
        // This will force the update
        BL_SkinDeformer::ForceUpdate();
        bShapeUpdate = true;
    }
    // check for armature deform
    bSkinUpdate = BL_SkinDeformer::UpdateInternal(bShapeUpdate && m_bDynamic);

    // non dynamic deformer = Modifer without armature and shape keys, no need to create storage
    if (!bSkinUpdate && bShapeUpdate && m_bDynamic) {
        // this means that there is no armature, we still need to 
        // update the normal (was not done after shape key calculation)

#ifdef __NLA_DEFNORMALS
        if (m_recalcNormal)
            RecalcNormals();
#endif
        bSkinUpdate = true;
    }
    return bSkinUpdate;
}

Key *BL_ShapeDeformer::GetKey()
{
    return m_bmesh->key;
}

void BL_ShapeDeformer::SetKey(Key *key)
{
    m_bmesh->key = key;
}