BL_MeshDeformer.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.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 * Simple deformation controller that restores a mesh to its rest position
 */

#if defined(WIN32) && !defined(FREE_WINDOWS)
// This warning tells us about truncation of __long__ stl-generated names.
// It can occasionally cause DevStudio to have internal compiler warnings.
#pragma warning( disable : 4786 )     
#endif

#include "RAS_IPolygonMaterial.h"
#include "BL_DeformableGameObject.h"
#include "BL_MeshDeformer.h"
#include "RAS_MeshObject.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"

#include "CTR_Map.h"
#include "STR_HashedString.h"
#include "BLI_math.h"

bool BL_MeshDeformer::Apply(RAS_IPolyMaterial*)
{
    size_t i;

    // only apply once per frame if the mesh is actually modified
    if(m_pMeshObject->MeshModified() &&
       m_lastDeformUpdate != m_gameobj->GetLastFrame()) {
        // For each material
        for(list<RAS_MeshMaterial>::iterator mit= m_pMeshObject->GetFirstMaterial();
            mit != m_pMeshObject->GetLastMaterial(); ++ mit) {
            if(!mit->m_slots[(void*)m_gameobj])
                continue;

            RAS_MeshSlot *slot = *mit->m_slots[(void*)m_gameobj];
            RAS_MeshSlot::iterator it;

            // for each array
            for(slot->begin(it); !slot->end(it); slot->next(it)) {
                //  For each vertex
                for(i=it.startvertex; i<it.endvertex; i++) {
                    RAS_TexVert& v = it.vertex[i];
                    v.SetXYZ(m_bmesh->mvert[v.getOrigIndex()].co);
                }
            }
        }

        m_lastDeformUpdate = m_gameobj->GetLastFrame();

        return true;
    }

    return false;
}

BL_MeshDeformer::~BL_MeshDeformer()
{   
    if (m_transverts)
        delete [] m_transverts;
    if (m_transnors)
        delete [] m_transnors;
}
 
void BL_MeshDeformer::ProcessReplica()
{
    m_transverts = NULL;
    m_transnors = NULL;
    m_tvtot = 0;
    m_bDynamic=false;
    m_lastDeformUpdate = -1;
}

void BL_MeshDeformer::Relink(CTR_Map<class CTR_HashedPtr, void*>*map)
{
    void **h_obj = (*map)[m_gameobj];

    if (h_obj)
        m_gameobj = (BL_DeformableGameObject*)(*h_obj);
    else
        m_gameobj = NULL;
}

void BL_MeshDeformer::RecalcNormals()
{
    /* We don't normalize for performance, not doing it for faces normals
     * gives area-weight normals which often look better anyway, and use
     * GL_NORMALIZE so we don't have to do per vertex normalization either
     * since the GPU can do it faster */
    list<RAS_MeshMaterial>::iterator mit;
    RAS_MeshSlot::iterator it;
    size_t i;

    /* set vertex normals to zero */
    memset(m_transnors, 0, sizeof(float)*3*m_bmesh->totvert);

    /* add face normals to vertices. */
    for(mit = m_pMeshObject->GetFirstMaterial();
        mit != m_pMeshObject->GetLastMaterial(); ++ mit) {
        if(!mit->m_slots[(void*)m_gameobj])
            continue;

        RAS_MeshSlot *slot = *mit->m_slots[(void*)m_gameobj];

        for(slot->begin(it); !slot->end(it); slot->next(it)) {
            int nvert = (int)it.array->m_type;

            for(i=0; i<it.totindex; i+=nvert) {
                RAS_TexVert& v1 = it.vertex[it.index[i]];
                RAS_TexVert& v2 = it.vertex[it.index[i+1]];
                RAS_TexVert& v3 = it.vertex[it.index[i+2]];
                RAS_TexVert *v4 = NULL;

                const float *co1 = m_transverts[v1.getOrigIndex()];
                const float *co2 = m_transverts[v2.getOrigIndex()];
                const float *co3 = m_transverts[v3.getOrigIndex()];
                const float *co4 = NULL;
                
                /* compute face normal */
                float fnor[3], n1[3], n2[3];

                if(nvert == 4) {
                    v4 = &it.vertex[it.index[i+3]];
                    co4 = m_transverts[v4->getOrigIndex()];

                    n1[0]= co1[0]-co3[0];
                    n1[1]= co1[1]-co3[1];
                    n1[2]= co1[2]-co3[2];

                    n2[0]= co2[0]-co4[0];
                    n2[1]= co2[1]-co4[1];
                    n2[2]= co2[2]-co4[2];
                }
                else {
                    n1[0]= co1[0]-co2[0];
                    n2[0]= co2[0]-co3[0];
                    n1[1]= co1[1]-co2[1];

                    n2[1]= co2[1]-co3[1];
                    n1[2]= co1[2]-co2[2];
                    n2[2]= co2[2]-co3[2];
                }

                fnor[0]= n1[1]*n2[2] - n1[2]*n2[1];
                fnor[1]= n1[2]*n2[0] - n1[0]*n2[2];
                fnor[2]= n1[0]*n2[1] - n1[1]*n2[0];
                normalize_v3(fnor);

                /* add to vertices for smooth normals */
                float *vn1 = m_transnors[v1.getOrigIndex()];
                float *vn2 = m_transnors[v2.getOrigIndex()];
                float *vn3 = m_transnors[v3.getOrigIndex()];

                vn1[0] += fnor[0]; vn1[1] += fnor[1]; vn1[2] += fnor[2];
                vn2[0] += fnor[0]; vn2[1] += fnor[1]; vn2[2] += fnor[2];
                vn3[0] += fnor[0]; vn3[1] += fnor[1]; vn3[2] += fnor[2];

                if(v4) {
                    float *vn4 = m_transnors[v4->getOrigIndex()];
                    vn4[0] += fnor[0]; vn4[1] += fnor[1]; vn4[2] += fnor[2];
                }

                /* in case of flat - just assign, the vertices are split */
                if(v1.getFlag() & RAS_TexVert::FLAT) {
                    v1.SetNormal(fnor);
                    v2.SetNormal(fnor);
                    v3.SetNormal(fnor);
                    if(v4)
                        v4->SetNormal(fnor);
                }
            }
        }
    }

    /* assign smooth vertex normals */
    for(mit = m_pMeshObject->GetFirstMaterial();
        mit != m_pMeshObject->GetLastMaterial(); ++ mit) {
        if(!mit->m_slots[(void*)m_gameobj])
            continue;

        RAS_MeshSlot *slot = *mit->m_slots[(void*)m_gameobj];

        for(slot->begin(it); !slot->end(it); slot->next(it)) {
            for(i=it.startvertex; i<it.endvertex; i++) {
                RAS_TexVert& v = it.vertex[i];

                if(!(v.getFlag() & RAS_TexVert::FLAT))
                    v.SetNormal(m_transnors[v.getOrigIndex()]); //.safe_normalized()
            }
        }
    }
}

void BL_MeshDeformer::VerifyStorage()
{
    /* Ensure that we have the right number of verts assigned */
    if (m_tvtot!=m_bmesh->totvert){
        if (m_transverts)
            delete [] m_transverts;
        if (m_transnors)
            delete [] m_transnors;
        
        m_transverts=new float[m_bmesh->totvert][3];
        m_transnors=new float[m_bmesh->totvert][3];
        m_tvtot = m_bmesh->totvert;
    }
}