assimp/code/AssetLib/LWO/LWOLoader.cpp

1618 lines
59 KiB
C++

/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
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*/
/** @file LWOLoader.cpp
* @brief Implementation of the LWO importer class
*/
#ifndef ASSIMP_BUILD_NO_LWO_IMPORTER
// internal headers
#include "AssetLib/LWO/LWOLoader.h"
#include "PostProcessing/ConvertToLHProcess.h"
#include "PostProcessing/ProcessHelper.h"
#include <assimp/ByteSwapper.h>
#include <assimp/SGSpatialSort.h>
#include <assimp/StringComparison.h>
#include <assimp/importerdesc.h>
#include <assimp/IOSystem.hpp>
#include <iomanip>
#include <map>
#include <memory>
#include <sstream>
using namespace Assimp;
static const aiImporterDesc desc = {
"LightWave/Modo Object Importer",
"",
"",
"https://www.lightwave3d.com/lightwave_sdk/",
aiImporterFlags_SupportTextFlavour,
0,
0,
0,
0,
"lwo lxo"
};
// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
LWOImporter::LWOImporter() :
mIsLWO2(),
mIsLXOB(),
mIsLWO3(),
mLayers(),
mCurLayer(),
mTags(),
mMapping(),
mSurfaces(),
mFileBuffer(),
fileSize(),
mScene(nullptr),
configSpeedFlag(),
configLayerIndex(),
hasNamedLayer() {
// empty
}
// ------------------------------------------------------------------------------------------------
// Destructor, private as well
LWOImporter::~LWOImporter() {
// empty
}
// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file.
bool LWOImporter::CanRead(const std::string &file, IOSystem *pIOHandler, bool /*checkSig*/) const {
static const uint32_t tokens[] = {
AI_LWO_FOURCC_LWOB,
AI_LWO_FOURCC_LWO2,
AI_LWO_FOURCC_LXOB
};
return CheckMagicToken(pIOHandler, file, tokens, AI_COUNT_OF(tokens), 8);
}
// ------------------------------------------------------------------------------------------------
// Setup configuration properties
void LWOImporter::SetupProperties(const Importer *pImp) {
configSpeedFlag = (0 != pImp->GetPropertyInteger(AI_CONFIG_FAVOUR_SPEED, 0) ? true : false);
configLayerIndex = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_LWO_ONE_LAYER_ONLY, UINT_MAX);
configLayerName = pImp->GetPropertyString(AI_CONFIG_IMPORT_LWO_ONE_LAYER_ONLY, "");
}
// ------------------------------------------------------------------------------------------------
// Get list of file extensions
const aiImporterDesc *LWOImporter::GetInfo() const {
return &desc;
}
// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure.
void LWOImporter::InternReadFile(const std::string &pFile,
aiScene *pScene,
IOSystem *pIOHandler) {
std::unique_ptr<IOStream> file(pIOHandler->Open(pFile, "rb"));
// Check whether we can read from the file
if (file.get() == nullptr) {
throw DeadlyImportError("Failed to open LWO file ", pFile, ".");
}
if ((this->fileSize = (unsigned int)file->FileSize()) < 12) {
throw DeadlyImportError("LWO: The file is too small to contain the IFF header");
}
// Allocate storage and copy the contents of the file to a memory buffer
std::vector<uint8_t> mBuffer(fileSize);
file->Read(&mBuffer[0], 1, fileSize);
mScene = pScene;
// Determine the type of the file
uint32_t fileType;
const char *sz = IFF::ReadHeader(&mBuffer[0], fileType);
if (sz) {
throw DeadlyImportError(sz);
}
mFileBuffer = &mBuffer[0] + 12;
fileSize -= 12;
// Initialize some members with their default values
hasNamedLayer = false;
// Create temporary storage on the stack but store pointers to it in the class
// instance. Therefore everything will be destructed properly if an exception
// is thrown and we needn't take care of that.
LayerList _mLayers;
SurfaceList _mSurfaces;
TagList _mTags;
TagMappingTable _mMapping;
mLayers = &_mLayers;
mTags = &_mTags;
mMapping = &_mMapping;
mSurfaces = &_mSurfaces;
// Allocate a default layer (layer indices are 1-based from now)
mLayers->push_back(Layer());
mCurLayer = &mLayers->back();
mCurLayer->mName = "<LWODefault>";
mCurLayer->mIndex = (uint16_t) -1;
// old lightwave file format (prior to v6)
mIsLWO2 = false;
mIsLWO3 = false;
mIsLXOB = false;
if (AI_LWO_FOURCC_LWOB == fileType) {
ASSIMP_LOG_INFO("LWO file format: LWOB (<= LightWave 5.5)");
LoadLWOBFile();
} else if (AI_LWO_FOURCC_LWO2 == fileType) {
// New lightwave format
ASSIMP_LOG_INFO("LWO file format: LWO2 (>= LightWave 6)");
} else if ( AI_LWO_FOURCC_LWO3 == fileType ) {
ASSIMP_LOG_INFO("LWO file format: LWO3 (>= LightWave 2018)");
} else if (AI_LWO_FOURCC_LXOB == fileType) {
// MODO file format
mIsLXOB = true;
ASSIMP_LOG_INFO("LWO file format: LXOB (Modo)");
}
else {
char szBuff[5];
szBuff[0] = (char)(fileType >> 24u);
szBuff[1] = (char)(fileType >> 16u);
szBuff[2] = (char)(fileType >> 8u);
szBuff[3] = (char)(fileType);
szBuff[4] = '\0';
throw DeadlyImportError("Unknown LWO sub format: ", szBuff);
}
if (AI_LWO_FOURCC_LWOB != fileType) { //
if( AI_LWO_FOURCC_LWO3 == fileType ) {
mIsLWO3 = true;
} else {
mIsLWO2 = true;
}
LoadLWO2File();
// The newer lightwave format allows the user to configure the
// loader that just one layer is used. If this is the case
// we need to check now whether the requested layer has been found.
if (UINT_MAX != configLayerIndex) {
unsigned int layerCount = 0;
for (std::list<LWO::Layer>::iterator itLayers = mLayers->begin(); itLayers != mLayers->end(); ++itLayers)
if (!itLayers->skip)
layerCount++;
if (layerCount != 2)
throw DeadlyImportError("LWO2: The requested layer was not found");
}
if (configLayerName.length() && !hasNamedLayer) {
throw DeadlyImportError("LWO2: Unable to find the requested layer: ", configLayerName);
}
}
// now, as we have loaded all data, we can resolve cross-referenced tags and clips
ResolveTags();
ResolveClips();
// now process all layers and build meshes and nodes
std::vector<aiMesh *> apcMeshes;
std::map<uint16_t, aiNode *> apcNodes;
apcMeshes.reserve(mLayers->size() * std::min(((unsigned int)mSurfaces->size() / 2u), 1u));
unsigned int iDefaultSurface = UINT_MAX; // index of the default surface
for (LWO::Layer &layer : *mLayers) {
if (layer.skip)
continue;
// I don't know whether there could be dummy layers, but it would be possible
const unsigned int meshStart = (unsigned int)apcMeshes.size();
if (!layer.mFaces.empty() && !layer.mTempPoints.empty()) {
// now sort all faces by the surfaces assigned to them
std::vector<SortedRep> pSorted(mSurfaces->size() + 1);
unsigned int i = 0;
for (FaceList::iterator it = layer.mFaces.begin(), end = layer.mFaces.end(); it != end; ++it, ++i) {
// Check whether we support this face's type
if ((*it).type != AI_LWO_FACE && (*it).type != AI_LWO_PTCH &&
(*it).type != AI_LWO_BONE && (*it).type != AI_LWO_SUBD) {
continue;
}
unsigned int idx = (*it).surfaceIndex;
if (idx >= mTags->size()) {
ASSIMP_LOG_WARN("LWO: Invalid face surface index");
idx = UINT_MAX;
}
if (UINT_MAX == idx || UINT_MAX == (idx = _mMapping[idx])) {
if (UINT_MAX == iDefaultSurface) {
iDefaultSurface = (unsigned int)mSurfaces->size();
mSurfaces->push_back(LWO::Surface());
LWO::Surface &surf = mSurfaces->back();
surf.mColor.r = surf.mColor.g = surf.mColor.b = 0.6f;
surf.mName = "LWODefaultSurface";
}
idx = iDefaultSurface;
}
pSorted[idx].push_back(i);
}
if (UINT_MAX == iDefaultSurface) {
pSorted.erase(pSorted.end() - 1);
}
for (unsigned int j = 0; j < mSurfaces->size(); ++j) {
SortedRep &sorted = pSorted[j];
if (sorted.empty())
continue;
// generate the mesh
aiMesh *mesh = new aiMesh();
apcMeshes.push_back(mesh);
mesh->mNumFaces = (unsigned int)sorted.size();
// count the number of vertices
SortedRep::const_iterator it = sorted.begin(), end = sorted.end();
for (; it != end; ++it) {
mesh->mNumVertices += layer.mFaces[*it].mNumIndices;
}
aiVector3D *nrm = nullptr, *pv = mesh->mVertices = new aiVector3D[mesh->mNumVertices];
aiFace *pf = mesh->mFaces = new aiFace[mesh->mNumFaces];
mesh->mMaterialIndex = j;
// find out which vertex color channels and which texture coordinate
// channels are really required by the material attached to this mesh
unsigned int vUVChannelIndices[AI_MAX_NUMBER_OF_TEXTURECOORDS];
unsigned int vVColorIndices[AI_MAX_NUMBER_OF_COLOR_SETS];
#ifdef ASSIMP_BUILD_DEBUG
for (unsigned int mui = 0; mui < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++mui) {
vUVChannelIndices[mui] = UINT_MAX;
}
for (unsigned int mui = 0; mui < AI_MAX_NUMBER_OF_COLOR_SETS; ++mui) {
vVColorIndices[mui] = UINT_MAX;
}
#endif
FindUVChannels(_mSurfaces[j], sorted, layer, vUVChannelIndices);
FindVCChannels(_mSurfaces[j], sorted, layer, vVColorIndices);
// allocate storage for UV and CV channels
aiVector3D *pvUV[AI_MAX_NUMBER_OF_TEXTURECOORDS];
for (unsigned int mui = 0; mui < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++mui) {
if (UINT_MAX == vUVChannelIndices[mui]) {
break;
}
pvUV[mui] = mesh->mTextureCoords[mui] = new aiVector3D[mesh->mNumVertices];
// LightWave doesn't support more than 2 UV components (?)
mesh->mNumUVComponents[0] = 2;
}
if (layer.mNormals.name.length()) {
nrm = mesh->mNormals = new aiVector3D[mesh->mNumVertices];
}
aiColor4D *pvVC[AI_MAX_NUMBER_OF_COLOR_SETS];
for (unsigned int mui = 0; mui < AI_MAX_NUMBER_OF_COLOR_SETS; ++mui) {
if (UINT_MAX == vVColorIndices[mui]) {
break;
}
pvVC[mui] = mesh->mColors[mui] = new aiColor4D[mesh->mNumVertices];
}
// we would not need this extra array, but the code is much cleaner if we use it
std::vector<unsigned int> &smoothingGroups = layer.mPointReferrers;
smoothingGroups.erase(smoothingGroups.begin(), smoothingGroups.end());
smoothingGroups.resize(mesh->mNumFaces, 0);
// now convert all faces
unsigned int vert = 0;
std::vector<unsigned int>::iterator outIt = smoothingGroups.begin();
for (it = sorted.begin(); it != end; ++it, ++outIt) {
const LWO::Face &face = layer.mFaces[*it];
*outIt = face.smoothGroup;
// copy all vertices
for (unsigned int q = 0; q < face.mNumIndices; ++q, ++vert) {
unsigned int idx = face.mIndices[q];
*pv++ = layer.mTempPoints[idx] /*- layer.mPivot*/;
// process UV coordinates
for (unsigned int w = 0; w < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++w) {
if (UINT_MAX == vUVChannelIndices[w]) {
break;
}
aiVector3D *&pp = pvUV[w];
const aiVector2D &src = ((aiVector2D *)&layer.mUVChannels[vUVChannelIndices[w]].rawData[0])[idx];
pp->x = src.x;
pp->y = src.y;
pp++;
}
// process normals (MODO extension)
if (nrm) {
*nrm = ((aiVector3D *)&layer.mNormals.rawData[0])[idx];
nrm->z *= -1.f;
++nrm;
}
// process vertex colors
for (unsigned int w = 0; w < AI_MAX_NUMBER_OF_COLOR_SETS; ++w) {
if (UINT_MAX == vVColorIndices[w]) {
break;
}
*pvVC[w] = ((aiColor4D *)&layer.mVColorChannels[vVColorIndices[w]].rawData[0])[idx];
// If a RGB color map is explicitly requested delete the
// alpha channel - it could theoretically be != 1.
if (_mSurfaces[j].mVCMapType == AI_LWO_RGB)
pvVC[w]->a = 1.f;
pvVC[w]++;
}
#if 0
// process vertex weights. We can't properly reconstruct the whole skeleton for now,
// but we can create dummy bones for all weight channels which we have.
for (unsigned int w = 0; w < layer.mWeightChannels.size();++w)
{
}
#endif
face.mIndices[q] = vert;
}
pf->mIndices = face.mIndices;
pf->mNumIndices = face.mNumIndices;
unsigned int **facePtr = (unsigned int **)&face.mIndices;
*facePtr = nullptr; // HACK: make sure it won't be deleted
pf++;
}
if (!mesh->mNormals) {
// Compute normal vectors for the mesh - we can't use our GenSmoothNormal-
// Step here since it wouldn't handle smoothing groups correctly for LWO.
// So we use a separate implementation.
ComputeNormals(mesh, smoothingGroups, _mSurfaces[j]);
} else {
ASSIMP_LOG_VERBOSE_DEBUG("LWO2: No need to compute normals, they're already there");
}
}
}
// Generate nodes to render the mesh. Store the source layer in the mParent member of the nodes
unsigned int num = static_cast<unsigned int>(apcMeshes.size() - meshStart);
if (layer.mName != "<LWODefault>" || num > 0) {
aiNode *pcNode = new aiNode();
pcNode->mName.Set(layer.mName);
pcNode->mParent = (aiNode *)&layer;
pcNode->mNumMeshes = num;
if (pcNode->mNumMeshes) {
pcNode->mMeshes = new unsigned int[pcNode->mNumMeshes];
for (unsigned int p = 0; p < pcNode->mNumMeshes; ++p)
pcNode->mMeshes[p] = p + meshStart;
}
apcNodes[layer.mIndex] = pcNode;
}
}
if (apcNodes.empty() || apcMeshes.empty())
throw DeadlyImportError("LWO: No meshes loaded");
// The RemoveRedundantMaterials step will clean this up later
pScene->mMaterials = new aiMaterial *[pScene->mNumMaterials = (unsigned int)mSurfaces->size()];
for (unsigned int mat = 0; mat < pScene->mNumMaterials; ++mat) {
aiMaterial *pcMat = new aiMaterial();
pScene->mMaterials[mat] = pcMat;
ConvertMaterial((*mSurfaces)[mat], pcMat);
}
// copy the meshes to the output structure
pScene->mMeshes = new aiMesh *[pScene->mNumMeshes = (unsigned int)apcMeshes.size()];
::memcpy(pScene->mMeshes, &apcMeshes[0], pScene->mNumMeshes * sizeof(void *));
// generate the final node graph
GenerateNodeGraph(apcNodes);
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::ComputeNormals(aiMesh *mesh, const std::vector<unsigned int> &smoothingGroups,
const LWO::Surface &surface) {
// Allocate output storage
mesh->mNormals = new aiVector3D[mesh->mNumVertices];
// First generate per-face normals
aiVector3D *out;
std::vector<aiVector3D> faceNormals;
// ... in some cases that's already enough
if (!surface.mMaximumSmoothAngle)
out = mesh->mNormals;
else {
faceNormals.resize(mesh->mNumVertices);
out = &faceNormals[0];
}
aiFace *begin = mesh->mFaces, *const end = mesh->mFaces + mesh->mNumFaces;
for (; begin != end; ++begin) {
aiFace &face = *begin;
if (face.mNumIndices < 3) {
continue;
}
// LWO doc: "the normal is defined as the cross product of the first and last edges"
aiVector3D *pV1 = mesh->mVertices + face.mIndices[0];
aiVector3D *pV2 = mesh->mVertices + face.mIndices[1];
aiVector3D *pV3 = mesh->mVertices + face.mIndices[face.mNumIndices - 1];
aiVector3D vNor = ((*pV2 - *pV1) ^ (*pV3 - *pV1)).Normalize();
for (unsigned int i = 0; i < face.mNumIndices; ++i)
out[face.mIndices[i]] = vNor;
}
if (!surface.mMaximumSmoothAngle) return;
const float posEpsilon = ComputePositionEpsilon(mesh);
// Now generate the spatial sort tree
SGSpatialSort sSort;
std::vector<unsigned int>::const_iterator it = smoothingGroups.begin();
for (begin = mesh->mFaces; begin != end; ++begin, ++it) {
aiFace &face = *begin;
for (unsigned int i = 0; i < face.mNumIndices; ++i) {
unsigned int tt = face.mIndices[i];
sSort.Add(mesh->mVertices[tt], tt, *it);
}
}
// Sort everything - this takes O(nlogn) time
sSort.Prepare();
std::vector<unsigned int> poResult;
poResult.reserve(20);
// Generate vertex normals. We have O(logn) for the binary lookup, which we need
// for n elements, thus the EXPECTED complexity is O(nlogn)
if (surface.mMaximumSmoothAngle < 3.f && !configSpeedFlag) {
const float fLimit = std::cos(surface.mMaximumSmoothAngle);
for (begin = mesh->mFaces, it = smoothingGroups.begin(); begin != end; ++begin, ++it) {
const aiFace &face = *begin;
unsigned int *beginIdx = face.mIndices, *const endIdx = face.mIndices + face.mNumIndices;
for (; beginIdx != endIdx; ++beginIdx) {
unsigned int idx = *beginIdx;
sSort.FindPositions(mesh->mVertices[idx], *it, posEpsilon, poResult, true);
aiVector3D vNormals;
for (std::vector<unsigned int>::const_iterator a = poResult.begin(); a != poResult.end(); ++a) {
const aiVector3D &v = faceNormals[*a];
if (v * faceNormals[idx] < fLimit)
continue;
vNormals += v;
}
mesh->mNormals[idx] = vNormals.Normalize();
}
}
}
// faster code path in case there is no smooth angle
else {
std::vector<bool> vertexDone(mesh->mNumVertices, false);
for (begin = mesh->mFaces, it = smoothingGroups.begin(); begin != end; ++begin, ++it) {
const aiFace &face = *begin;
unsigned int *beginIdx = face.mIndices, *const endIdx = face.mIndices + face.mNumIndices;
for (; beginIdx != endIdx; ++beginIdx) {
unsigned int idx = *beginIdx;
if (vertexDone[idx])
continue;
sSort.FindPositions(mesh->mVertices[idx], *it, posEpsilon, poResult, true);
aiVector3D vNormals;
for (std::vector<unsigned int>::const_iterator a = poResult.begin(); a != poResult.end(); ++a) {
const aiVector3D &v = faceNormals[*a];
vNormals += v;
}
vNormals.Normalize();
for (std::vector<unsigned int>::const_iterator a = poResult.begin(); a != poResult.end(); ++a) {
mesh->mNormals[*a] = vNormals;
vertexDone[*a] = true;
}
}
}
}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::GenerateNodeGraph(std::map<uint16_t, aiNode *> &apcNodes) {
// now generate the final nodegraph - generate a root node and attach children
aiNode *root = mScene->mRootNode = new aiNode();
root->mName.Set("<LWORoot>");
//Set parent of all children, inserting pivots
std::map<uint16_t, aiNode *> mapPivot;
for (auto itapcNodes = apcNodes.begin(); itapcNodes != apcNodes.end(); ++itapcNodes) {
//Get the parent index
LWO::Layer *nodeLayer = (LWO::Layer *)(itapcNodes->second->mParent);
uint16_t parentIndex = nodeLayer->mParent;
//Create pivot node, store it into the pivot map, and set the parent as the pivot
aiNode *pivotNode = new aiNode();
pivotNode->mName.Set("Pivot-" + std::string(itapcNodes->second->mName.data));
itapcNodes->second->mParent = pivotNode;
//Look for the parent node to attach the pivot to
if (apcNodes.find(parentIndex) != apcNodes.end()) {
pivotNode->mParent = apcNodes[parentIndex];
} else {
//If not, attach to the root node
pivotNode->mParent = root;
}
//Set the node and the pivot node transformation
itapcNodes->second->mTransformation.a4 = -nodeLayer->mPivot.x;
itapcNodes->second->mTransformation.b4 = -nodeLayer->mPivot.y;
itapcNodes->second->mTransformation.c4 = -nodeLayer->mPivot.z;
pivotNode->mTransformation.a4 = nodeLayer->mPivot.x;
pivotNode->mTransformation.b4 = nodeLayer->mPivot.y;
pivotNode->mTransformation.c4 = nodeLayer->mPivot.z;
mapPivot[-(itapcNodes->first + 2)] = pivotNode;
}
//Merge pivot map into node map
for (auto itMapPivot = mapPivot.begin(); itMapPivot != mapPivot.end(); ++itMapPivot) {
apcNodes[itMapPivot->first] = itMapPivot->second;
}
//Set children of all parents
apcNodes[(uint16_t)-1] = root;
for (auto itMapParentNodes = apcNodes.begin(); itMapParentNodes != apcNodes.end(); ++itMapParentNodes) {
for (auto itMapChildNodes = apcNodes.begin(); itMapChildNodes != apcNodes.end(); ++itMapChildNodes) {
if ((itMapParentNodes->first != itMapChildNodes->first) && (itMapParentNodes->second == itMapChildNodes->second->mParent)) {
++(itMapParentNodes->second->mNumChildren);
}
}
if (itMapParentNodes->second->mNumChildren) {
itMapParentNodes->second->mChildren = new aiNode *[itMapParentNodes->second->mNumChildren];
uint16_t p = 0;
for (auto itMapChildNodes = apcNodes.begin(); itMapChildNodes != apcNodes.end(); ++itMapChildNodes) {
if ((itMapParentNodes->first != itMapChildNodes->first) && (itMapParentNodes->second == itMapChildNodes->second->mParent)) {
itMapParentNodes->second->mChildren[p++] = itMapChildNodes->second;
}
}
}
}
if (!mScene->mRootNode->mNumChildren)
throw DeadlyImportError("LWO: Unable to build a valid node graph");
// Remove a single root node with no meshes assigned to it ...
if (1 == mScene->mRootNode->mNumChildren) {
aiNode *pc = mScene->mRootNode->mChildren[0];
pc->mParent = mScene->mRootNode->mChildren[0] = nullptr;
delete mScene->mRootNode;
mScene->mRootNode = pc;
}
// convert the whole stuff to RH with CCW winding
MakeLeftHandedProcess maker;
maker.Execute(mScene);
FlipWindingOrderProcess flipper;
flipper.Execute(mScene);
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::ResolveTags() {
// --- this function is used for both LWO2 and LWOB
mMapping->resize(mTags->size(), UINT_MAX);
for (unsigned int a = 0; a < mTags->size(); ++a) {
const std::string &c = (*mTags)[a];
for (unsigned int i = 0; i < mSurfaces->size(); ++i) {
const std::string &d = (*mSurfaces)[i].mName;
if (!ASSIMP_stricmp(c, d)) {
(*mMapping)[a] = i;
break;
}
}
}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::ResolveClips() {
for (unsigned int i = 0; i < mClips.size(); ++i) {
Clip &clip = mClips[i];
if (Clip::REF == clip.type) {
if (clip.clipRef >= mClips.size()) {
ASSIMP_LOG_ERROR("LWO2: Clip referrer index is out of range");
clip.clipRef = 0;
}
Clip &dest = mClips[clip.clipRef];
if (Clip::REF == dest.type) {
ASSIMP_LOG_ERROR("LWO2: Clip references another clip reference");
clip.type = Clip::UNSUPPORTED;
}
else {
clip.path = dest.path;
clip.type = dest.type;
}
}
}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::AdjustTexturePath(std::string &out) {
// --- this function is used for both LWO2 and LWOB
if (!mIsLWO2 && !mIsLWO3 && ::strstr(out.c_str(), "(sequence)")) {
// remove the (sequence) and append 000
ASSIMP_LOG_INFO("LWOB: Sequence of animated texture found. It will be ignored");
out = out.substr(0, out.length() - 10) + "000";
}
// format: drive:path/file - we just need to insert a slash after the drive
std::string::size_type n = out.find_first_of(':');
if (std::string::npos != n) {
out.insert(n + 1, "/");
}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWOTags(unsigned int size) {
// --- this function is used for both LWO2 and LWOB
const char *szCur = (const char *)mFileBuffer, *szLast = szCur;
const char *const szEnd = szLast + size;
while (szCur < szEnd) {
if (!(*szCur)) {
const size_t len = (size_t)(szCur - szLast);
// FIX: skip empty-sized tags
if (len)
mTags->push_back(std::string(szLast, len));
szCur += (len & 0x1 ? 1 : 2);
szLast = szCur;
}
szCur++;
}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWOPoints(unsigned int length) {
// --- this function is used for both LWO2 and LWOB but for
// LWO2 we need to allocate 25% more storage - it could be we'll
// need to duplicate some points later.
const size_t vertexLen = 12;
if ((length % vertexLen) != 0) {
throw DeadlyImportError("LWO2: Points chunk length is not multiple of vertexLen (12)");
}
unsigned int regularSize = (unsigned int)mCurLayer->mTempPoints.size() + length / 12;
if (mIsLWO2 || mIsLWO3) {
mCurLayer->mTempPoints.reserve(regularSize + (regularSize >> 2u));
mCurLayer->mTempPoints.resize(regularSize);
// initialize all point referrers with the default values
mCurLayer->mPointReferrers.reserve(regularSize + (regularSize >> 2u));
mCurLayer->mPointReferrers.resize(regularSize, UINT_MAX);
} else
mCurLayer->mTempPoints.resize(regularSize);
// perform endianness conversions
#ifndef AI_BUILD_BIG_ENDIAN
for (unsigned int i = 0; i<length >> 2; ++i)
ByteSwap::Swap4(mFileBuffer + (i << 2));
#endif
::memcpy(&mCurLayer->mTempPoints[0], mFileBuffer, length);
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWO2Polygons(unsigned int length) {
LE_NCONST uint16_t *const end = (LE_NCONST uint16_t *)(mFileBuffer + length);
const uint32_t type = GetU4();
// Determine the type of the polygons
switch (type) {
// read unsupported stuff too (although we won't process it)
case AI_LWO_MBAL:
ASSIMP_LOG_WARN("LWO2: Encountered unsupported primitive chunk (METABALL)");
break;
case AI_LWO_CURV:
ASSIMP_LOG_WARN("LWO2: Encountered unsupported primitive chunk (SPLINE)");
;
break;
// These are ok with no restrictions
case AI_LWO_PTCH:
case AI_LWO_FACE:
case AI_LWO_BONE:
case AI_LWO_SUBD:
break;
default:
// hm!? wtf is this? ok ...
ASSIMP_LOG_ERROR("LWO2: Ignoring unknown polygon type.");
break;
}
// first find out how many faces and vertices we'll finally need
uint16_t *cursor = (uint16_t *)mFileBuffer;
unsigned int iNumFaces = 0, iNumVertices = 0;
CountVertsAndFacesLWO2(iNumVertices, iNumFaces, cursor, end);
// allocate the output array and copy face indices
if (iNumFaces) {
cursor = (uint16_t *)mFileBuffer;
mCurLayer->mFaces.resize(iNumFaces, LWO::Face(type));
FaceList::iterator it = mCurLayer->mFaces.begin();
CopyFaceIndicesLWO2(it, cursor, end);
}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::CountVertsAndFacesLWO2(unsigned int &verts, unsigned int &faces,
uint16_t *&cursor, const uint16_t *const end, unsigned int max) {
while (cursor < end && max--) {
uint16_t numIndices;
::memcpy(&numIndices, cursor++, 2);
AI_LSWAP2(numIndices);
numIndices &= 0x03FF;
verts += numIndices;
++faces;
for (uint16_t i = 0; i < numIndices; i++) {
ReadVSizedIntLWO2((uint8_t *&)cursor);
}
}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::CopyFaceIndicesLWO2(FaceList::iterator &it,
uint16_t *&cursor,
const uint16_t *const end) {
while (cursor < end) {
LWO::Face &face = *it++;
uint16_t numIndices;
::memcpy(&numIndices, cursor++, 2);
AI_LSWAP2(numIndices);
face.mNumIndices = numIndices & 0x03FF;
if (face.mNumIndices) /* byte swapping has already been done */
{
face.mIndices = new unsigned int[face.mNumIndices];
for (unsigned int i = 0; i < face.mNumIndices; i++) {
face.mIndices[i] = ReadVSizedIntLWO2((uint8_t *&)cursor) + mCurLayer->mPointIDXOfs;
if (face.mIndices[i] > mCurLayer->mTempPoints.size()) {
ASSIMP_LOG_WARN("LWO2: Failure evaluating face record, index is out of range");
face.mIndices[i] = (unsigned int)mCurLayer->mTempPoints.size() - 1;
}
}
} else
throw DeadlyImportError("LWO2: Encountered invalid face record with zero indices");
}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWO2PolygonTags(unsigned int length) {
LE_NCONST uint8_t *const end = mFileBuffer + length;
AI_LWO_VALIDATE_CHUNK_LENGTH(length, PTAG, 4);
uint32_t type = GetU4();
if (type != AI_LWO_SURF && type != AI_LWO_SMGP)
return;
while (mFileBuffer < end) {
unsigned int i = ReadVSizedIntLWO2(mFileBuffer) + mCurLayer->mFaceIDXOfs;
unsigned int j = GetU2();
if (i >= mCurLayer->mFaces.size()) {
ASSIMP_LOG_WARN("LWO2: face index in PTAG is out of range");
continue;
}
switch (type) {
case AI_LWO_SURF:
mCurLayer->mFaces[i].surfaceIndex = j;
break;
case AI_LWO_SMGP: /* is that really used? */
mCurLayer->mFaces[i].smoothGroup = j;
break;
};
}
}
// ------------------------------------------------------------------------------------------------
template <class T>
VMapEntry *FindEntry(std::vector<T> &list, const std::string &name, bool perPoly) {
for (auto &elem : list) {
if (elem.name == name) {
if (!perPoly) {
ASSIMP_LOG_WARN("LWO2: Found two VMAP sections with equal names");
}
return &elem;
}
}
list.push_back(T());
VMapEntry *p = &list.back();
p->name = name;
return p;
}
// ------------------------------------------------------------------------------------------------
template <class T>
inline void CreateNewEntry(T &chan, unsigned int srcIdx) {
if (!chan.name.length())
return;
chan.abAssigned[srcIdx] = true;
chan.abAssigned.resize(chan.abAssigned.size() + 1, false);
for (unsigned int a = 0; a < chan.dims; ++a)
chan.rawData.push_back(chan.rawData[srcIdx * chan.dims + a]);
}
// ------------------------------------------------------------------------------------------------
template <class T>
inline void CreateNewEntry(std::vector<T> &list, unsigned int srcIdx) {
for (auto &elem : list) {
CreateNewEntry(elem, srcIdx);
}
}
// ------------------------------------------------------------------------------------------------
inline void LWOImporter::DoRecursiveVMAPAssignment(VMapEntry *base, unsigned int numRead,
unsigned int idx, float *data) {
ai_assert(nullptr != data);
LWO::ReferrerList &refList = mCurLayer->mPointReferrers;
unsigned int i;
if (idx >= base->abAssigned.size()) {
throw DeadlyImportError("Bad index");
}
base->abAssigned[idx] = true;
for (i = 0; i < numRead; ++i) {
base->rawData[idx * base->dims + i] = data[i];
}
if (UINT_MAX != (i = refList[idx])) {
DoRecursiveVMAPAssignment(base, numRead, i, data);
}
}
// ------------------------------------------------------------------------------------------------
inline void AddToSingleLinkedList(ReferrerList &refList, unsigned int srcIdx, unsigned int destIdx) {
if (UINT_MAX == refList[srcIdx]) {
refList[srcIdx] = destIdx;
return;
}
AddToSingleLinkedList(refList, refList[srcIdx], destIdx);
}
// ------------------------------------------------------------------------------------------------
// Load LWO2 vertex map
void LWOImporter::LoadLWO2VertexMap(unsigned int length, bool perPoly) {
LE_NCONST uint8_t *const end = mFileBuffer + length;
AI_LWO_VALIDATE_CHUNK_LENGTH(length, VMAP, 6);
unsigned int type = GetU4();
unsigned int dims = GetU2();
VMapEntry *base;
// read the name of the vertex map
std::string name;
GetS0(name, length);
switch (type) {
case AI_LWO_TXUV:
if (dims != 2) {
ASSIMP_LOG_WARN("LWO2: Skipping UV channel \'", name, "\' with !2 components");
return;
}
base = FindEntry(mCurLayer->mUVChannels, name, perPoly);
break;
case AI_LWO_WGHT:
case AI_LWO_MNVW:
if (dims != 1) {
ASSIMP_LOG_WARN("LWO2: Skipping Weight Channel \'", name, "\' with !1 components");
return;
}
base = FindEntry((type == AI_LWO_WGHT ? mCurLayer->mWeightChannels : mCurLayer->mSWeightChannels), name, perPoly);
break;
case AI_LWO_RGB:
case AI_LWO_RGBA:
if (dims != 3 && dims != 4) {
ASSIMP_LOG_WARN("LWO2: Skipping Color Map \'", name, "\' with a dimension > 4 or < 3");
return;
}
base = FindEntry(mCurLayer->mVColorChannels, name, perPoly);
break;
case AI_LWO_MODO_NORM:
/* This is a non-standard extension chunk used by Luxology's MODO.
* It stores per-vertex normals. This VMAP exists just once, has
* 3 dimensions and is btw extremely beautiful.
*/
if (name != "vert_normals" || dims != 3 || mCurLayer->mNormals.name.length())
return;
ASSIMP_LOG_INFO("Processing non-standard extension: MODO VMAP.NORM.vert_normals");
mCurLayer->mNormals.name = name;
base = &mCurLayer->mNormals;
break;
case AI_LWO_PICK: /* these VMAPs are just silently dropped */
case AI_LWO_MORF:
case AI_LWO_SPOT:
return;
default:
if (name == "APS.Level") {
// XXX handle this (seems to be subdivision-related).
}
ASSIMP_LOG_WARN("LWO2: Skipping unknown VMAP/VMAD channel \'", name, "\'");
return;
};
base->Allocate((unsigned int)mCurLayer->mTempPoints.size());
// now read all entries in the map
type = std::min(dims, base->dims);
const unsigned int diff = (dims - type) << 2u;
LWO::FaceList &list = mCurLayer->mFaces;
LWO::PointList &pointList = mCurLayer->mTempPoints;
LWO::ReferrerList &refList = mCurLayer->mPointReferrers;
const unsigned int numPoints = (unsigned int)pointList.size();
const unsigned int numFaces = (unsigned int)list.size();
while (mFileBuffer < end) {
unsigned int idx = ReadVSizedIntLWO2(mFileBuffer) + mCurLayer->mPointIDXOfs;
if (idx >= numPoints) {
ASSIMP_LOG_WARN("LWO2: Failure evaluating VMAP/VMAD entry \'", name, "\', vertex index is out of range");
mFileBuffer += base->dims << 2u;
continue;
}
if (perPoly) {
unsigned int polyIdx = ReadVSizedIntLWO2(mFileBuffer) + mCurLayer->mFaceIDXOfs;
if (base->abAssigned[idx]) {
// we have already a VMAP entry for this vertex - thus
// we need to duplicate the corresponding polygon.
if (polyIdx >= numFaces) {
ASSIMP_LOG_WARN("LWO2: Failure evaluating VMAD entry \'", name, "\', polygon index is out of range");
mFileBuffer += base->dims << 2u;
continue;
}
LWO::Face &src = list[polyIdx];
// generate a new unique vertex for the corresponding index - but only
// if we can find the index in the face
bool had = false;
for (unsigned int i = 0; i < src.mNumIndices; ++i) {
unsigned int srcIdx = src.mIndices[i], tmp = idx;
do {
if (tmp == srcIdx)
break;
} while ((tmp = refList[tmp]) != UINT_MAX);
if (tmp == UINT_MAX) {
continue;
}
had = true;
refList.resize(refList.size() + 1, UINT_MAX);
idx = (unsigned int)pointList.size();
src.mIndices[i] = (unsigned int)pointList.size();
// store the index of the new vertex in the old vertex
// so we get a single linked list we can traverse in
// only one direction
AddToSingleLinkedList(refList, srcIdx, src.mIndices[i]);
pointList.push_back(pointList[srcIdx]);
CreateNewEntry(mCurLayer->mVColorChannels, srcIdx);
CreateNewEntry(mCurLayer->mUVChannels, srcIdx);
CreateNewEntry(mCurLayer->mWeightChannels, srcIdx);
CreateNewEntry(mCurLayer->mSWeightChannels, srcIdx);
CreateNewEntry(mCurLayer->mNormals, srcIdx);
}
if (!had) {
ASSIMP_LOG_WARN("LWO2: Failure evaluating VMAD entry \'", name, "\', vertex index wasn't found in that polygon");
ai_assert(had);
}
}
}
std::unique_ptr<float[]> temp(new float[type]);
for (unsigned int l = 0; l < type; ++l)
temp[l] = GetF4();
DoRecursiveVMAPAssignment(base, type, idx, temp.get());
mFileBuffer += diff;
}
}
// ------------------------------------------------------------------------------------------------
// Load LWO2 clip
void LWOImporter::LoadLWO2Clip(unsigned int length) {
AI_LWO_VALIDATE_CHUNK_LENGTH(length, CLIP, 10);
mClips.push_back(LWO::Clip());
LWO::Clip &clip = mClips.back();
// first - get the index of the clip
clip.idx = GetU4();
IFF::SubChunkHeader head = IFF::LoadSubChunk(mFileBuffer);
switch (head.type) {
case AI_LWO_STIL:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, STIL, 1);
// "Normal" texture
GetS0(clip.path, head.length);
clip.type = Clip::STILL;
break;
case AI_LWO_ISEQ:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, ISEQ, 16);
// Image sequence. We'll later take the first.
{
uint8_t digits = GetU1();
mFileBuffer++;
int16_t offset = GetU2();
mFileBuffer += 4;
int16_t start = GetU2();
mFileBuffer += 4;
std::string s;
std::ostringstream ss;
GetS0(s, head.length);
head.length -= (uint16_t)s.length() + 1;
ss << s;
ss << std::setw(digits) << offset + start;
GetS0(s, head.length);
ss << s;
clip.path = ss.str();
clip.type = Clip::SEQ;
}
break;
case AI_LWO_STCC:
ASSIMP_LOG_WARN("LWO2: Color shifted images are not supported");
break;
case AI_LWO_ANIM:
ASSIMP_LOG_WARN("LWO2: Animated textures are not supported");
break;
case AI_LWO_XREF:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, XREF, 4);
// Just a cross-reference to another CLIp
clip.type = Clip::REF;
clip.clipRef = GetU4();
break;
case AI_LWO_NEGA:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, NEGA, 2);
clip.negate = (0 != GetU2());
break;
default:
ASSIMP_LOG_WARN("LWO2: Encountered unknown CLIP sub-chunk");
}
}
void LWOImporter::LoadLWO3Clip(unsigned int length) {
AI_LWO_VALIDATE_CHUNK_LENGTH(length, CLIP, 12);
mClips.push_back(LWO::Clip());
LWO::Clip &clip = mClips.back();
// first - get the index of the clip
clip.idx = GetU4();
IFF::ChunkHeader head = IFF::LoadChunk(mFileBuffer);
switch (head.type) {
case AI_LWO_STIL:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, STIL, 1);
// "Normal" texture
GetS0(clip.path, head.length);
clip.type = Clip::STILL;
break;
case AI_LWO_ISEQ:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, ISEQ, 16);
// Image sequence. We'll later take the first.
{
uint8_t digits = GetU1();
mFileBuffer++;
int16_t offset = GetU2();
mFileBuffer += 4;
int16_t start = GetU2();
mFileBuffer += 4;
std::string s;
std::ostringstream ss;
GetS0(s, head.length);
head.length -= (uint16_t)s.length() + 1;
ss << s;
ss << std::setw(digits) << offset + start;
GetS0(s, head.length);
ss << s;
clip.path = ss.str();
clip.type = Clip::SEQ;
}
break;
case AI_LWO_STCC:
ASSIMP_LOG_WARN("LWO3: Color shifted images are not supported");
break;
case AI_LWO_ANIM:
ASSIMP_LOG_WARN("LWO3: Animated textures are not supported");
break;
case AI_LWO_XREF:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, XREF, 4);
// Just a cross-reference to another CLIp
clip.type = Clip::REF;
clip.clipRef = GetU4();
break;
case AI_LWO_NEGA:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, NEGA, 2);
clip.negate = (0 != GetU2());
break;
default:
ASSIMP_LOG_WARN("LWO3: Encountered unknown CLIP sub-chunk");
}
}
// ------------------------------------------------------------------------------------------------
// Load envelope description
void LWOImporter::LoadLWO2Envelope(unsigned int length) {
LE_NCONST uint8_t *const end = mFileBuffer + length;
AI_LWO_VALIDATE_CHUNK_LENGTH(length, ENVL, 4);
mEnvelopes.push_back(LWO::Envelope());
LWO::Envelope &envelope = mEnvelopes.back();
// Get the index of the envelope
envelope.index = ReadVSizedIntLWO2(mFileBuffer);
// It looks like there might be an extra U4 right after the index,
// at least in modo (LXOB) files: we'll ignore it if it's zero,
// otherwise it represents the start of a subchunk, so we backtrack.
if (mIsLXOB) {
uint32_t extra = GetU4();
if (extra) {
mFileBuffer -= 4;
}
}
// ... and read all subchunks
while (true) {
if (mFileBuffer + 6 >= end) break;
LE_NCONST IFF::SubChunkHeader head = IFF::LoadSubChunk(mFileBuffer);
if (mFileBuffer + head.length > end)
throw DeadlyImportError("LWO2: Invalid envelope chunk length");
uint8_t *const next = mFileBuffer + head.length;
switch (head.type) {
// Type & representation of the envelope
case AI_LWO_TYPE:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, TYPE, 2);
mFileBuffer++; // skip user format
// Determine type of envelope
envelope.type = (LWO::EnvelopeType)*mFileBuffer;
++mFileBuffer;
break;
// precondition
case AI_LWO_PRE:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, PRE, 2);
envelope.pre = (LWO::PrePostBehaviour)GetU2();
break;
// postcondition
case AI_LWO_POST:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, POST, 2);
envelope.post = (LWO::PrePostBehaviour)GetU2();
break;
// keyframe
case AI_LWO_KEY: {
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, KEY, 8);
envelope.keys.push_back(LWO::Key());
LWO::Key &key = envelope.keys.back();
key.time = GetF4();
key.value = GetF4();
break;
}
// interval interpolation
case AI_LWO_SPAN: {
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, SPAN, 4);
if (envelope.keys.size() < 2)
ASSIMP_LOG_WARN("LWO2: Unexpected SPAN chunk");
else {
LWO::Key &key = envelope.keys.back();
switch (GetU4()) {
case AI_LWO_STEP:
key.inter = LWO::IT_STEP;
break;
case AI_LWO_LINE:
key.inter = LWO::IT_LINE;
break;
case AI_LWO_TCB:
key.inter = LWO::IT_TCB;
break;
case AI_LWO_HERM:
key.inter = LWO::IT_HERM;
break;
case AI_LWO_BEZI:
key.inter = LWO::IT_BEZI;
break;
case AI_LWO_BEZ2:
key.inter = LWO::IT_BEZ2;
break;
default:
ASSIMP_LOG_WARN("LWO2: Unknown interval interpolation mode");
};
// todo ... read params
}
break;
}
default:
ASSIMP_LOG_WARN("LWO2: Encountered unknown ENVL subchunk");
break;
}
// regardless how much we did actually read, go to the next chunk
mFileBuffer = next;
}
}
void LWOImporter::LoadLWO3Envelope(unsigned int length) {
LE_NCONST uint8_t *const end = mFileBuffer + length;
AI_LWO_VALIDATE_CHUNK_LENGTH(length, ENVL, 4);
mEnvelopes.push_back(LWO::Envelope());
LWO::Envelope &envelope = mEnvelopes.back();
// Get the index of the envelope
envelope.index = ReadVSizedIntLWO2(mFileBuffer);
// ... and read all blocks
while (true) {
if (mFileBuffer + 8 >= end) break;
LE_NCONST IFF::ChunkHeader head = IFF::LoadChunk(mFileBuffer);
if (mFileBuffer + head.length > end)
throw DeadlyImportError("LWO3: Invalid envelope chunk length");
uint8_t *const next = mFileBuffer + head.length;
switch (head.type) {
// Type & representation of the envelope
case AI_LWO_TYPE:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, TYPE, 4);
mFileBuffer++; // skip user format
// Determine type of envelope
envelope.type = (LWO::EnvelopeType)*mFileBuffer;
++mFileBuffer;
break;
// precondition
case AI_LWO_PRE:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, PRE, 4);
envelope.pre = (LWO::PrePostBehaviour)GetU2();
break;
// postcondition
case AI_LWO_POST:
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, POST, 4);
envelope.post = (LWO::PrePostBehaviour)GetU2();
break;
// keyframe
case AI_LWO_KEY: {
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, KEY, 10);
envelope.keys.push_back(LWO::Key());
LWO::Key &key = envelope.keys.back();
key.time = GetF4();
key.value = GetF4();
break;
}
// interval interpolation
case AI_LWO_SPAN: {
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, SPAN, 6);
if (envelope.keys.size() < 2)
ASSIMP_LOG_WARN("LWO3: Unexpected SPAN chunk");
else {
LWO::Key &key = envelope.keys.back();
switch (GetU4()) {
case AI_LWO_STEP:
key.inter = LWO::IT_STEP;
break;
case AI_LWO_LINE:
key.inter = LWO::IT_LINE;
break;
case AI_LWO_TCB:
key.inter = LWO::IT_TCB;
break;
case AI_LWO_HERM:
key.inter = LWO::IT_HERM;
break;
case AI_LWO_BEZI:
key.inter = LWO::IT_BEZI;
break;
case AI_LWO_BEZ2:
key.inter = LWO::IT_BEZ2;
break;
default:
ASSIMP_LOG_WARN("LWO3: Unknown interval interpolation mode");
};
// todo ... read params
}
break;
}
default:
ASSIMP_LOG_WARN("LWO3: Encountered unknown ENVL subchunk");
break;
}
// regardless how much we did actually read, go to the next chunk
mFileBuffer = next;
}
}
// ------------------------------------------------------------------------------------------------
// Load file - master function
void LWOImporter::LoadLWO2File() {
bool skip = false;
LE_NCONST uint8_t *const end = mFileBuffer + fileSize;
unsigned int iUnnamed = 0;
while (true) {
if (mFileBuffer + sizeof(IFF::ChunkHeader) > end) break;
IFF::ChunkHeader head = IFF::LoadChunk(mFileBuffer);
int bufOffset = 0;
if( head.type == AI_IFF_FOURCC_FORM ) { // not chunk, it's a form
mFileBuffer -= 8;
head = IFF::LoadForm(mFileBuffer);
bufOffset = 4;
}
if (mFileBuffer + head.length > end) {
throw DeadlyImportError("LWO2: Chunk length points behind the file");
break;
}
uint8_t *const next = mFileBuffer + head.length;
mFileBuffer += bufOffset;
if (!head.length) {
mFileBuffer = next;
continue;
}
switch (head.type) {
// new layer
case AI_LWO_LAYR: {
// add a new layer to the list ....
mLayers->push_back(LWO::Layer());
LWO::Layer &layer = mLayers->back();
mCurLayer = &layer;
AI_LWO_VALIDATE_CHUNK_LENGTH(head.length, LAYR, 16);
// layer index.
layer.mIndex = GetU2();
// Continue loading this layer or ignore it? Check the layer index property
if (UINT_MAX != configLayerIndex && (configLayerIndex - 1) != layer.mIndex) {
skip = true;
} else
skip = false;
// pivot point
mFileBuffer += 2; /* unknown */
mCurLayer->mPivot.x = GetF4();
mCurLayer->mPivot.y = GetF4();
mCurLayer->mPivot.z = GetF4();
GetS0(layer.mName, head.length - 16);
// if the name is empty, generate a default name
if (layer.mName.empty()) {
char buffer[128]; // should be sufficiently large
::ai_snprintf(buffer, 128, "Layer_%i", iUnnamed++);
layer.mName = buffer;
}
// load this layer or ignore it? Check the layer name property
if (configLayerName.length() && configLayerName != layer.mName) {
skip = true;
} else
hasNamedLayer = true;
// optional: parent of this layer
if (mFileBuffer + 2 <= next)
layer.mParent = GetU2();
else
layer.mParent = (uint16_t) -1;
// Set layer skip parameter
layer.skip = skip;
break;
}
// vertex list
case AI_LWO_PNTS: {
if (skip)
break;
unsigned int old = (unsigned int)mCurLayer->mTempPoints.size();
LoadLWOPoints(head.length);
mCurLayer->mPointIDXOfs = old;
break;
}
// vertex tags
case AI_LWO_VMAD:
if (mCurLayer->mFaces.empty()) {
ASSIMP_LOG_WARN("LWO2: Unexpected VMAD chunk");
break;
}
// --- intentionally no break here
case AI_LWO_VMAP: {
if (skip)
break;
if (mCurLayer->mTempPoints.empty())
ASSIMP_LOG_WARN("LWO2: Unexpected VMAP chunk");
else
LoadLWO2VertexMap(head.length, head.type == AI_LWO_VMAD);
break;
}
// face list
case AI_LWO_POLS: {
if (skip)
break;
unsigned int old = (unsigned int)mCurLayer->mFaces.size();
LoadLWO2Polygons(head.length);
mCurLayer->mFaceIDXOfs = old;
break;
}
// polygon tags
case AI_LWO_PTAG: {
if (skip)
break;
if (mCurLayer->mFaces.empty()) {
ASSIMP_LOG_WARN("LWO2: Unexpected PTAG");
} else {
LoadLWO2PolygonTags(head.length);
}
break;
}
// list of tags
case AI_LWO_TAGS: {
if (!mTags->empty()) {
ASSIMP_LOG_WARN("LWO2: SRFS chunk encountered twice");
} else {
LoadLWOTags(head.length);
}
break;
}
// surface chunk
case AI_LWO_SURF: {
if( mIsLWO3 )
LoadLWO3Surface(head.length);
else
LoadLWO2Surface(head.length);
break;
}
// clip chunk
case AI_LWO_CLIP: {
if( mIsLWO3 )
LoadLWO3Clip(head.length);
else
LoadLWO2Clip(head.length);
break;
}
// envelope chunk
case AI_LWO_ENVL: {
if( mIsLWO3 )
LoadLWO3Envelope(head.length);
else
LoadLWO2Envelope(head.length);
break;
}
}
mFileBuffer = next;
}
}
#endif // !! ASSIMP_BUILD_NO_LWO_IMPORTER