assimp.assimp/code/RawLoader.cpp

/*
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Open Asset Import Library (ASSIMP)
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Copyright (c) 2006-2008, ASSIMP Development Team

All rights reserved.

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  following disclaimer.

* Redistributions in binary form must reproduce the above
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  following disclaimer in the documentation and/or other
  materials provided with the distribution.

* Neither the name of the ASSIMP team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/

/** @file Implementation of the RAW importer class */

#include "AssimpPCH.h"

// internal headers
#include "RawLoader.h"
#include "ParsingUtils.h"
#include "fast_atof.h"


using namespace Assimp;


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

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

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool RAWImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler) const
{
	// simple check of file extension is enough for the moment
	std::string::size_type pos = pFile.find_last_of('.');
	// no file extension - can't read
	if( pos == std::string::npos)return false;
	std::string extension = pFile.substr( pos);

	if (extension.length() < 4)return false;
	if (extension[0] != '.')return false;

	return !(extension.length() != 4 || extension[0] != '.' ||
			 extension[1] != 'r' && extension[1] != 'R' ||
			 extension[2] != 'a' && extension[2] != 'A' ||
			 extension[3] != 'w' && extension[3] != 'W');
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void RAWImporter::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 RAW file " + pFile + ".");

	unsigned int fileSize = (unsigned int)file->FileSize();

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

	// list of groups loaded from the file
	std::vector< GroupInformation > outGroups(1,GroupInformation("<default>"));
	std::vector< GroupInformation >::iterator curGroup = outGroups.begin();

	// now read all lines
	char line[4096];
	while (GetNextLine(buffer,line))
	{
		// if the line starts with a non-numeric identifier, it marks
		// the beginning of a new group
		const char* sz = line;SkipSpaces(&sz);
		if (IsLineEnd(*sz))continue;
		if (!IsNumeric(*sz))
		{
			const char* sz2 = sz;
			while (!IsSpaceOrNewLine(*sz2))++sz2;
			const unsigned int length = (unsigned int)(sz2-sz);

			// find an existing group with this name
			for (std::vector< GroupInformation >::iterator it = outGroups.begin(), end = outGroups.end();
				it != end;++it)
			{
				if (length == (*it).name.length() && !::strcmp(sz,(*it).name.c_str()))
				{
					curGroup = it;sz2 = NULL;
					break;
				}
			}
			if (sz2)
			{
				outGroups.push_back(GroupInformation(std::string(sz,length)));
				curGroup = outGroups.end()-1;
			}
		}
		else
		{
			// there can be maximally 12 floats plus an extra texture file name
			float data[12];
			unsigned int num;
			for (num = 0; num < 12;++num)
			{
				if(!SkipSpaces(&sz) || !IsNumeric(*sz))break;
				sz = fast_atof_move(sz,data[num]);
			}
			if (num != 12 && num != 9)
			{
				DefaultLogger::get()->error("A line may have either 9 or 12 floats and an optional texture");
				continue;
			}

			MeshInformation* output = NULL;

			const char* sz2 = sz;
			unsigned int length;
			if (!IsLineEnd(*sz))
			{
				while (!IsSpaceOrNewLine(*sz2))++sz2;
				length = (unsigned int)(sz2-sz);
			}
			else if (9 == num)
			{
				sz = "%default%";
				length = 9;
			}
			else 
			{
				sz = "";
				length = 0;
			}

			// search in the list of meshes whether we have one with this texture
			for (std::vector< MeshInformation >::iterator it = (*curGroup).meshes.begin(),
				end = (*curGroup).meshes.end(); it != end; ++it)
			{
				if (length == (*it).name.length() && (length ? !::strcmp(sz,(*it).name.c_str()) : true))
				{
					output = &(*it);
					break;
				}
			}
			// if we don't have the mesh, create it
			if (!output)
			{
				(*curGroup).meshes.push_back(MeshInformation(std::string(sz,length)));
				output = &((*curGroup).meshes.back());
			}
			if (12 == num)
			{
				aiColor4D v(data[0],data[1],data[2],1.0f);
				output->colors.push_back(v);
				output->colors.push_back(v);
				output->colors.push_back(v);

				output->vertices.push_back(aiVector3D(data[3],data[4],data[5]));
				output->vertices.push_back(aiVector3D(data[6],data[7],data[8]));
				output->vertices.push_back(aiVector3D(data[9],data[10],data[11]));
			}
			else
			{
				output->vertices.push_back(aiVector3D(data[0],data[1],data[2]));
				output->vertices.push_back(aiVector3D(data[3],data[4],data[5]));
				output->vertices.push_back(aiVector3D(data[6],data[7],data[8]));
			}
		}
	}

	pScene->mRootNode = new aiNode();
	pScene->mRootNode->mName.Set("<RawRoot>");

	// count the number of valid groups
	// (meshes can't be empty)
	for (std::vector< GroupInformation >::iterator it = outGroups.begin(), end = outGroups.end();
		it != end;++it)
	{
		if (!(*it).meshes.empty())
		{
			++pScene->mRootNode->mNumChildren; 
			pScene->mNumMeshes += (unsigned int)(*it).meshes.size();
		}
	}

	if (!pScene->mNumMeshes)
	{
		throw new ImportErrorException("RAW: No meshes loaded. The file seems to be corrupt or empty.");
	}

	pScene->mMeshes = new aiMesh*[pScene->mNumMeshes];
	aiNode** cc;
	if (1 == pScene->mRootNode->mNumChildren)
	{
		cc = &pScene->mRootNode;
		pScene->mRootNode->mNumChildren = 0;
	}
	else cc = pScene->mRootNode->mChildren = new aiNode*[pScene->mRootNode->mNumChildren];

	pScene->mNumMaterials = pScene->mNumMeshes;
	aiMaterial** mats = pScene->mMaterials = new aiMaterial*[pScene->mNumMaterials];

	unsigned int meshIdx = 0;
	for (std::vector< GroupInformation >::iterator it = outGroups.begin(), end = outGroups.end();
		it != end;++it)
	{
		if ((*it).meshes.empty())continue;
		
		aiNode* node;
		if (pScene->mRootNode->mNumChildren)
		{
			node = *cc = new aiNode();
			node->mParent = pScene->mRootNode;
		}
		else node = *cc;++cc;
		node->mName.Set((*it).name);

		// add all meshes
		node->mNumMeshes = (unsigned int)(*it).meshes.size();
		unsigned int* pi = node->mMeshes = new unsigned int[ node->mNumMeshes ];
		for (std::vector< MeshInformation >::iterator it2 = (*it).meshes.begin(),
			end2 = (*it).meshes.end(); it2 != end2; ++it2)
		{
			ai_assert(!(*it2).vertices.empty());

			// allocate the mesh
			*pi++ = meshIdx;
			aiMesh* mesh = pScene->mMeshes[meshIdx] = new aiMesh();
			mesh->mMaterialIndex = meshIdx++;

			mesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

			// allocate storage for the vertex components and copy them
			mesh->mNumVertices = (unsigned int)(*it2).vertices.size();
			mesh->mVertices = new aiVector3D[ mesh->mNumVertices ];
			::memcpy(mesh->mVertices,&(*it2).vertices[0],sizeof(aiVector3D)*mesh->mNumVertices);

			if ((*it2).colors.size())
			{
				ai_assert((*it2).colors.size() == mesh->mNumVertices);

				mesh->mColors[0] = new aiColor4D[ mesh->mNumVertices ];
				::memcpy(mesh->mColors[0],&(*it2).colors[0],sizeof(aiColor4D)*mesh->mNumVertices);
			}

			// generate triangles
			ai_assert(0 == mesh->mNumVertices % 3);
			aiFace* fc = mesh->mFaces = new aiFace[ mesh->mNumFaces = mesh->mNumVertices/3 ];
			aiFace* const fcEnd = fc + mesh->mNumFaces;
			unsigned int n = 0;
			while (fc != fcEnd)
			{
				aiFace& f = *fc++;
				f.mIndices = new unsigned int[f.mNumIndices = 3];
				for (unsigned int m = 0; m < 3;++m)
					f.mIndices[m] = n++;
			}

			// generate a material for the mesh
			MaterialHelper* mat = new MaterialHelper();

			aiColor4D clr(1.0f,1.0f,1.0f,1.0f);
			if ("%default%" == (*it2).name) // a gray default material
			{
				clr.r = clr.g = clr.b = 0.6f;
			}
			else if ((*it2).name.length() > 0) // a texture
			{
				aiString s;
				s.Set((*it2).name);
				mat->AddProperty(&s,AI_MATKEY_TEXTURE_DIFFUSE(0));
			}
			mat->AddProperty<aiColor4D>(&clr,1,AI_MATKEY_COLOR_DIFFUSE);
			*mats++ = mat;
		}
	}
}