assimp/code/ObjFileImporter.cpp

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#include "ObjFileImporter.h"
#include "ObjFileParser.h"
#include "ObjFileData.h"
#include "../include/IOStream.h"
#include "../include/IOSystem.h"
#include "../include/aiMesh.h"
#include "../include/aiScene.h"
#include "../include/aiAssert.h"
#include "MaterialSystem.h"
#include "DefaultLogger.h"
#include <boost/scoped_ptr.hpp>
#include <boost/format.hpp>
namespace Assimp
{
// ------------------------------------------------------------------------------------------------
using namespace std;
//! Obj-file-format extention
const string ObjFileImporter::OBJ_EXT = "obj";
// ------------------------------------------------------------------------------------------------
// Default constructor
ObjFileImporter::ObjFileImporter() :
m_pRootObject(NULL),
m_strAbsPath("\\")
{
}
// ------------------------------------------------------------------------------------------------
// Destructor
ObjFileImporter::~ObjFileImporter()
{
// Release root object instance
if (NULL != m_pRootObject)
{
delete m_pRootObject;
m_pRootObject = NULL;
}
}
// ------------------------------------------------------------------------------------------------
// Returns true, fi file is an obj file
bool ObjFileImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler) const
{
if (pFile.empty())
return false;
string::size_type pos = pFile.find_last_of(".");
if (string::npos == pos)
return false;
const string ext = pFile.substr(pos+1, pFile.size() - pos - 1);
if (ext == OBJ_EXT)
return true;
return false;
}
// ------------------------------------------------------------------------------------------------
// Obj-file import implementation
void ObjFileImporter::InternReadFile( const std::string& pFile, aiScene* pScene, IOSystem* pIOHandler)
{
// Read file into memory
const std::string mode = "rb";
boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile, mode));
if (NULL == file.get())
throw new ImportErrorException( "Failed to open file " + pFile + ".");
// Get the filesize and vaslidate it, throwing an exception when failes
size_t fileSize = file->FileSize();
if( fileSize < 16)
throw new ImportErrorException( "OBJ-file is too small.");
// Allocate buffer and read file into it
m_Buffer.resize( fileSize );
const size_t readsize = file->Read(&m_Buffer.front(), sizeof(char), fileSize);
assert (readsize == fileSize);
//
std::string strDirectory("\\"), strModelName;
std::string::size_type pos = pFile.find_last_of("\\");
if (pos != std::string::npos)
{
strDirectory = pFile.substr(0, pos);
strModelName = pFile.substr(pos+1, pFile.size() - pos - 1);
}
else
{
strModelName = pFile;
}
// parse the file into a temporary representation
ObjFileParser parser(m_Buffer, strDirectory, strModelName);
// And create the proper return structures out of it
CreateDataFromImport(parser.GetModel(), pScene);
}
// ------------------------------------------------------------------------------------------------
// Create the data from parsed obj-file
void ObjFileImporter::CreateDataFromImport(const ObjFile::Model* pModel, aiScene* pScene)
{
if (0L == pModel)
return;
// Create the root node of the scene
pScene->mRootNode = new aiNode();
if (!pModel->m_ModelName.empty())
{
// Set the name of the scene
pScene->mRootNode->mName.Set(pModel->m_ModelName);
}
else
{
// This is an error, so break down the application
assert (false);
}
// Create nodes for the whole scene
std::vector<aiMesh*> MeshArray;
for (size_t index = 0; index < pModel->m_Objects.size(); index++)
{
createNodes(pModel, pModel->m_Objects[ index ], pScene->mRootNode, pScene, MeshArray);
}
// Create mesh pointer buffer for this scene
if (pScene->mNumMeshes > 0)
{
pScene->mMeshes = new aiMesh*[ pScene->mNumMeshes ];
for (size_t index =0; index < pScene->mNumMeshes; index++)
{
pScene->mMeshes [ index ] = MeshArray[ index ];
}
}
// Create all materials
for (size_t index = 0; index < pModel->m_Objects.size(); index++)
{
createMaterial(pModel, pModel->m_Objects[ index ], pScene);
}
}
// ------------------------------------------------------------------------------------------------
// Creates all nodes of the model
aiNode *ObjFileImporter::createNodes(const ObjFile::Model* pModel, const ObjFile::Object* pData,
aiNode *pParent, aiScene* pScene,
std::vector<aiMesh*> &MeshArray)
{
if (NULL == pData)
return NULL;
// Store older mesh size to be able to computate mesh offsets for new mesh instances
size_t oldMeshSize = MeshArray.size();
aiNode *pNode = new aiNode();
if (pParent != NULL)
this->appendChildToParentNode(pParent, pNode);
aiMesh *pMesh = new aiMesh();
MeshArray.push_back(pMesh);
createTopology(pModel, pData, pMesh);
// Create all nodes from the subobjects stored in the current object
if (!pData->m_SubObjects.empty())
{
pNode->mNumChildren = pData->m_SubObjects.size();
pNode->mChildren = new aiNode*[pData->m_SubObjects.size()];
pNode->mNumMeshes = 1;
pNode->mMeshes = new unsigned int[1];
// Loop over all child objects
for (size_t index = 0; index < pData->m_SubObjects.size(); index++)
{
// Create all child nodes
pNode->mChildren[index] = createNodes(pModel, pData, pNode, pScene, MeshArray);
// Create meshes of this object
pMesh = new aiMesh();
MeshArray.push_back(pMesh);
createTopology(pModel, pData->m_SubObjects[ index ], pMesh);
// Create material of this object
createMaterial(pModel, pData->m_SubObjects[ index ], pScene);
}
}
// Set mesh instances into scene- and node-instances
const size_t meshSizeDiff = MeshArray.size()- oldMeshSize;
if (meshSizeDiff > 0 )
{
pNode->mMeshes = new unsigned int[ meshSizeDiff ];
pNode->mNumMeshes++;
size_t index = 0;
for (size_t i = oldMeshSize; i < MeshArray.size(); i++)
{
pNode->mMeshes[ index ] = pScene->mNumMeshes;
pScene->mNumMeshes++;
index++;
}
}
return pNode;
}
// ------------------------------------------------------------------------------------------------
// Create topology data
void ObjFileImporter::createTopology(const ObjFile::Model* pModel, const ObjFile::Object* pData,
aiMesh* pMesh)
{
if (NULL == pData)
return;
// Create mesh vertices
createVertexArray(pModel, pData, pMesh);
// Create faces
pMesh->mNumFaces = pData->m_Faces.size();
pMesh->mFaces = new aiFace[pMesh->mNumFaces];
for (size_t index = 0; index < pMesh->mNumFaces; index++)
{
aiFace *pFace = &pMesh->mFaces[ index ];
pFace->mNumIndices = pData->m_Faces[index]->m_pVertices->size();
if (pFace->mNumIndices > 0)
{
pFace->mIndices = new unsigned int[pMesh->mFaces[index].mNumIndices];
ObjFile::Face::IndexArray *pArray = pData->m_Faces[index]->m_pVertices;
// TODO: Should be implement much better
//memcpy(pFace->mIndices, &pData->m_Faces[index]->m_pVertices[0], pFace->mNumIndices * sizeof(unsigned int));
if (pArray != NULL)
{
for (size_t a=0; a<pFace->mNumIndices; a++)
{
pFace->mIndices[a] = pArray->at( a );
}
}
else
{
ai_assert (false);
}
}
}
}
// ------------------------------------------------------------------------------------------------
void ObjFileImporter::createVertexArray(const ObjFile::Model* pModel,
const ObjFile::Object* pCurrentObject,
aiMesh* pMesh)
{
// Break, if no faces are stored in object
if (pCurrentObject->m_Faces.empty())
return;
// Copy all stored vertices, normals and so on
pMesh->mNumVertices = pModel->m_Vertices.size();
pMesh->mVertices = new aiVector3D[pMesh->mNumVertices];
for (size_t index=0; index < pModel->m_Vertices.size(); index++)
{
pMesh->mVertices[ index ] = *pModel->m_Vertices[ index ];
}
if (!pModel->m_Normals.empty())
{
pMesh->mNormals = new aiVector3D[pModel->m_Normals.size()];
for (size_t index = 0; index < pModel->m_Normals.size(); index++)
{
pMesh->mNormals[ index ] = *pModel->m_Normals[ index ];
}
}
if (!pModel->m_TextureCoord.empty())
{
// TODO: Implement texture coodinates
}
}
// ------------------------------------------------------------------------------------------------
void ObjFileImporter::countObjects(const std::vector<ObjFile::Object*> &rObjects, int &iNumMeshes)
{
iNumMeshes = 0;
if (rObjects.empty())
return;
iNumMeshes += rObjects.size();
for (std::vector<ObjFile::Object*>::const_iterator it = rObjects.begin();
it != rObjects.end();
++it)
{
if (!(*it)->m_SubObjects.empty())
{
countObjects((*it)->m_SubObjects, iNumMeshes);
}
}
}
// ------------------------------------------------------------------------------------------------
void ObjFileImporter::createMaterial(const ObjFile::Model* pModel, const ObjFile::Object* pData,
aiScene* pScene)
{
ai_assert (NULL != pScene);
if (NULL == pData)
return;
// Create only a dumy material to enshure a running viewer
pScene->mNumMaterials = 1;
Assimp::MaterialHelper* mat = new Assimp::MaterialHelper;
// Create a new material
pScene->mMaterials = new aiMaterial*[1];
pScene->mMaterials[0] = mat;
}
// ------------------------------------------------------------------------------------------------
// Appends this node to the parent node
void ObjFileImporter::appendChildToParentNode(aiNode *pParent, aiNode *pChild)
{
// Checking preconditions
ai_assert (NULL != pParent);
ai_assert (NULL != pChild);
// Assign parent to child
pChild->mParent = pParent;
size_t sNumChildren = 0;
// If already children was assigned to the parent node, store them in a
std::vector<aiNode*> temp;
if (pParent->mChildren != NULL)
{
sNumChildren = pParent->mNumChildren;
ai_assert (0 != sNumChildren);
for (size_t index = 0; index < pParent->mNumChildren; index++)
{
temp.push_back(pParent->mChildren [ index ] );
}
delete [] pParent->mChildren;
}
// Copy node instances into parent node
pParent->mNumChildren++;
pParent->mChildren = new aiNode*[ pParent->mNumChildren ];
for (size_t index = 0; index < pParent->mNumChildren-1; index++)
{
pParent->mChildren[ index ] = temp [ index ];
}
pParent->mChildren[ pParent->mNumChildren-1 ] = pChild;
}
// ------------------------------------------------------------------------------------------------
} // Namespace Assimp