assimp/code/CSMLoader.cpp

/*
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Open Asset Import Library (ASSIMP)
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*/

/** @file  CSMLoader.cpp
 *  Implementation of the CSM importer class.
 */

#include "AssimpPCH.h"

#ifndef AI_BUILD_NO_CSM_IMPORTER

#include "CSMLoader.h"
#include "SkeletonMeshBuilder.h"
#include "ParsingUtils.h"
#include "fast_atof.h"

using namespace Assimp;

// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
CSMImporter::CSMImporter()
{}

// ------------------------------------------------------------------------------------------------
// Destructor, private as well 
CSMImporter::~CSMImporter()
{}

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool CSMImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
{
	// check file extension 
	const std::string extension = GetExtension(pFile);
	
	if( extension == "csm")
		return true;

	if ((checkSig || !extension.length()) && pIOHandler) {
		const char* tokens[] = {"$Filename"};
		return SearchFileHeaderForToken(pIOHandler,pFile,tokens,1);
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
// Build a string of all file extensions supported
void CSMImporter::GetExtensionList(std::string& append)
{
	append.append("*.csm");
}

// ------------------------------------------------------------------------------------------------
// Setup configuration properties for the loader
void CSMImporter::SetupProperties(const Importer* pImp)
{
	// nothing to be done for the moment
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void CSMImporter::InternReadFile( const std::string& pFile, 
	aiScene* pScene, IOSystem* pIOHandler)
{
	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile, "rb"));

	// Check whether we can read from the file
	if( file.get() == NULL)
		throw new ImportErrorException( "Failed to open CSM file " + pFile + ".");

	size_t fileSize = file->FileSize();

	// allocate storage and copy the contents of the file to a memory buffer
	std::vector<char> mBuffer2(fileSize+1);
	file->Read(&mBuffer2[0], 1, fileSize);mBuffer2[fileSize] = '\0';

	const char* buffer = &mBuffer2[0];

	aiAnimation* anim = new aiAnimation();
	int first = 0, last = 0x00ffffff;

	// now process the file and look out for '$' sections
	while (1)	{
		SkipSpaces(&buffer);
		if ('\0' == *buffer)
			break;

		if ('$'  == *buffer)	{
			++buffer;
			if (TokenMatchI(buffer,"firstframe",10))	{
				SkipSpaces(&buffer);
				first = strtol10s(buffer,&buffer);
			}
			else if (TokenMatchI(buffer,"lastframe",9))		{
				SkipSpaces(&buffer);
				last = strtol10s(buffer,&buffer);
			}
			else if (TokenMatchI(buffer,"rate",4))	{
				SkipSpaces(&buffer);
				float d;
				buffer = fast_atof_move(buffer,d);
				anim->mTicksPerSecond = d;
			}
			else if (TokenMatchI(buffer,"order",5))	{
				std::vector< aiNodeAnim* > anims_temp;
				anims_temp.reserve(30);
				while (1)	{
					SkipSpaces(&buffer);
					if (IsLineEnd(*buffer) && SkipSpacesAndLineEnd(&buffer) && *buffer == '$')
						break; // next section

					// Construct a new node animation channel and setup its name
					anims_temp.push_back(new aiNodeAnim());
					aiNodeAnim* nda = anims_temp.back();

					char* ot = nda->mNodeName.data;
					while (!IsSpaceOrNewLine(*buffer))
						*ot++ = *buffer++;

					*ot = '\0';
					nda->mNodeName.length = (size_t)(ot-nda->mNodeName.data);
				}

				anim->mNumChannels = anims_temp.size();
				if (!anim->mNumChannels)
					throw new ImportErrorException("CSM: Empty $order section");

				// copy over to the output animation
				anim->mChannels = new aiNodeAnim*[anim->mNumChannels];
				::memcpy(anim->mChannels,&anims_temp[0],sizeof(aiNodeAnim*)*anim->mNumChannels);
			}
			else if (TokenMatchI(buffer,"points",6))	{
				if (!anim->mNumChannels)
					throw new ImportErrorException("CSM: \'$order\' section is required to appear prior to \'$points\'");

				// If we know how many frames we'll read, we can preallocate some storage
				unsigned int alloc = 100;
				if (last != 0x00ffffff)
				{
					alloc = last-first;
					alloc += alloc>>2u; // + 25%
					for (unsigned int i = 0; i < anim->mNumChannels;++i)
						anim->mChannels[i]->mPositionKeys = new aiVectorKey[alloc];
				}

				unsigned int filled = 0;

				// Now read all point data.
				while (1)	{
					SkipSpaces(&buffer);
					if (IsLineEnd(*buffer) && (!SkipSpacesAndLineEnd(&buffer) || *buffer == '$'))	{
						break; // next section
					}

					// read frame
					const int frame = ::strtol10(buffer,&buffer);
					last  = std::max(frame,last);
					first = std::min(frame,last);
					for (unsigned int i = 0; i < anim->mNumChannels;++i)	{

						aiNodeAnim* s = anim->mChannels[i];
						if (s->mNumPositionKeys == alloc)	{ /* need to reallocate? */

							aiVectorKey* old = s->mPositionKeys;
							s->mPositionKeys = new aiVectorKey[s->mNumPositionKeys = alloc*2];
							::memcpy(s->mPositionKeys,old,sizeof(aiVectorKey)*alloc);
							delete[] old;
						}

						// read x,y,z
						if(!SkipSpacesAndLineEnd(&buffer))
							throw new ImportErrorException("CSM: Unexpected EOF occured reading sample x coord");

						if (TokenMatchI(buffer, "DROPOUT", 7))	{
							// seems this is invalid marker data; at least the doc says it's possible
							DefaultLogger::get()->warn("CSM: Encountered invalid marker data (DROPOUT)");
						}
						else	{
							aiVectorKey* sub = s->mPositionKeys + s->mNumPositionKeys;
							sub->mTime = (double)frame;
							buffer = fast_atof_move(buffer, (float&)sub->mValue.x);

							if(!SkipSpacesAndLineEnd(&buffer))
								throw new ImportErrorException("CSM: Unexpected EOF occured reading sample y coord");
							buffer = fast_atof_move(buffer, (float&)sub->mValue.y);

							if(!SkipSpacesAndLineEnd(&buffer))
								throw new ImportErrorException("CSM: Unexpected EOF occured reading sample z coord");
							buffer = fast_atof_move(buffer, (float&)sub->mValue.z);

							++s->mNumPositionKeys;
						}
					}

					// update allocation granularity
					if (filled == alloc)
						alloc *= 2;

					++filled;
				}
				// all channels must be complete in order to continue safely.
				for (unsigned int i = 0; i < anim->mNumChannels;++i)	{

					if (!anim->mChannels[i]->mNumPositionKeys)
						throw new ImportErrorException("CSM: Invalid marker track");
				}
			}
		}
		else	{
			// advance to the next line
			SkipLine(&buffer);
		}
	}

	// Setup a proper animation duration
	anim->mDuration = last - std::min( first, 0 );

	// build a dummy root node with the tiny markers as children
	pScene->mRootNode = new aiNode();
	pScene->mRootNode->mName.Set("$CSM_DummyRoot");

	pScene->mRootNode->mNumChildren = anim->mNumChannels;
	pScene->mRootNode->mChildren = new aiNode* [anim->mNumChannels];

	for (unsigned int i = 0; i < anim->mNumChannels;++i)	{
		aiNodeAnim* na = anim->mChannels[i]; 

		aiNode* nd  = pScene->mRootNode->mChildren[i] = new aiNode();
		nd->mName   = anim->mChannels[i]->mNodeName;
		nd->mParent = pScene->mRootNode;

		aiMatrix4x4::Translation(na->mPositionKeys[0].mValue, nd->mTransformation);
	}

	// Store the one and only animation in the scene
	pScene->mAnimations    = new aiAnimation*[pScene->mNumAnimations=1];
	pScene->mAnimations[0] = anim;
	anim->mName.Set("$CSM_MasterAnim");

	// mark the scene as incomplete and run SkeletonMeshBuilder on it
	pScene->mFlags |= AI_SCENE_FLAGS_INCOMPLETE;
	SkeletonMeshBuilder maker(pScene,pScene->mRootNode,true);
}

#endif // !! AI_BUILD_NO_CSM_IMPORTER