assimp/code/IRRMeshLoader.cpp

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

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*/

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

#include "AssimpPCH.h"

#include "IRRMeshLoader.h"
#include "ParsingUtils.h"
#include "fast_atof.h"

using namespace Assimp;
using namespace irr;
using namespace irr::io;

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

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

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool IRRMeshImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
{
	/* NOTE: A simple check for the file extension is not enough
	 * here. Irrmesh and irr are easy, but xml is too generic
	 * and could be collada, too. So we need to open the file and
	 * search for typical tokens.
	 */
	const std::string extension = GetExtension(pFile);

	if (extension == "irrmesh")return true;
	else if (extension == "xml" || checkSig)
	{
		/*  If CanRead() is called to check whether the loader
		 *  supports a specific file extension in general we
		 *  must return true here.
		 */
		if (!pIOHandler)return true;
		const char* tokens[] = {"irrmesh"};
		return SearchFileHeaderForToken(pIOHandler,pFile,tokens,1);
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
// Get a list of all file extensions which are handled by this class
void IRRMeshImporter::GetExtensionList(std::string& append)
{
	// fixme: consider cleaner handling of xml extension
	append.append("*.xml;*.irrmesh");
}

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

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

	// Construct the irrXML parser
	CIrrXML_IOStreamReader st(file.get());
	reader = createIrrXMLReader((IFileReadCallBack*) &st);

	// final data
	std::vector<aiMaterial*> materials;
	std::vector<aiMesh*>     meshes;
	materials.reserve (5);
	meshes.reserve    (5);

	// temporary data - current mesh buffer
	aiMaterial* curMat	= NULL;
	aiMesh* curMesh		= NULL;
	unsigned int curMatFlags;

	std::vector<aiVector3D> curVertices,curNormals,curTangents,curBitangents;
	std::vector<aiColor4D>  curColors;
	std::vector<aiVector3D> curUVs,curUV2s;

	// some temporary variables
	int textMeaning = 0;
	int vertexFormat = 0; // 0 = normal; 1 = 2 tcoords, 2 = tangents
	bool useColors = false;

	// Parse the XML file
	while (reader->read())	{
		switch (reader->getNodeType())	{
		case EXN_ELEMENT:
			
			if (!ASSIMP_stricmp(reader->getNodeName(),"buffer") && (curMat || curMesh))	{
				// end of previous buffer. A material and a mesh should be there
				if ( !curMat || !curMesh)	{
					DefaultLogger::get()->error("IRRMESH: A buffer must contain a mesh and a material");
					delete curMat;
					delete curMesh;
				}
				else	{
					materials.push_back(curMat); 
					meshes.push_back(curMesh);  
				}
				curMat  = NULL;
				curMesh = NULL;

				curVertices.clear();
				curColors.clear();
				curNormals.clear();
				curUV2s.clear();
				curUVs.clear();
				curTangents.clear();
				curBitangents.clear();
			}
			

			if (!ASSIMP_stricmp(reader->getNodeName(),"material"))	{
				if (curMat)	{
					DefaultLogger::get()->warn("IRRMESH: Only one material description per buffer, please");
					delete curMat;curMat = NULL;
				}
				curMat = ParseMaterial(curMatFlags);
			}
			/* no else here! */ if (!ASSIMP_stricmp(reader->getNodeName(),"vertices"))
			{
				int num = reader->getAttributeValueAsInt("vertexCount");

				if (!num)	{
					// This is possible ... remove the mesh from the list and skip further reading
					DefaultLogger::get()->warn("IRRMESH: Found mesh with zero vertices");

					delete curMat;curMat = NULL;

					curMesh = NULL;
					textMeaning = 0;
					continue;
				}

				curVertices.reserve (num);
				curNormals.reserve  (num);
				curColors.reserve   (num);
				curUVs.reserve      (num);

				// Determine the file format
				const char* t = reader->getAttributeValueSafe("type");
				if (!ASSIMP_stricmp("2tcoords", t))	{
					curUV2s.reserve (num);
					vertexFormat = 1;

					if (curMatFlags & AI_IRRMESH_EXTRA_2ND_TEXTURE)	{
						// *********************************************************
						// We have a second texture! So use this UV channel
						// for it. The 2nd texture can be either a normal
						// texture (solid_2layer or lightmap_xxx) or a normal 
						// map (normal_..., parallax_...)
						// *********************************************************
						int idx = 1;
						MaterialHelper* mat = ( MaterialHelper* ) curMat;

						if (curMatFlags & AI_IRRMESH_MAT_lightmap){
							mat->AddProperty(&idx,1,AI_MATKEY_UVWSRC_LIGHTMAP(0));
						}
						else if (curMatFlags & AI_IRRMESH_MAT_normalmap_solid){
							mat->AddProperty(&idx,1,AI_MATKEY_UVWSRC_NORMALS(0));
						}
						else if (curMatFlags & AI_IRRMESH_MAT_solid_2layer) {
							mat->AddProperty(&idx,1,AI_MATKEY_UVWSRC_DIFFUSE(1));
						}
					}
				}
				else if (!ASSIMP_stricmp("tangents", t))	{
					curTangents.reserve (num);
					curBitangents.reserve (num);
					vertexFormat = 2;
				}
				else if (ASSIMP_stricmp("standard", t))	{
					delete curMat;
					DefaultLogger::get()->warn("IRRMESH: Unknown vertex format");
				}
				else vertexFormat = 0;
				textMeaning = 1;
			}
			else if (!ASSIMP_stricmp(reader->getNodeName(),"indices"))	{
				if (curVertices.empty() && curMat)	{
					delete curMat;
					throw new ImportErrorException("IRRMESH: indices must come after vertices");
				}

				textMeaning = 2;

				// start a new mesh
				curMesh = new aiMesh();

				// allocate storage for all faces
				curMesh->mNumVertices = reader->getAttributeValueAsInt("indexCount");
				if (!curMesh->mNumVertices)	{
					// This is possible ... remove the mesh from the list and skip further reading
					DefaultLogger::get()->warn("IRRMESH: Found mesh with zero indices");

					// mesh - away
					delete curMesh; curMesh = NULL;

					// material - away
					delete curMat;curMat = NULL;

					textMeaning = 0;
					continue;
				}

				if (curMesh->mNumVertices % 3)	{
					DefaultLogger::get()->warn("IRRMESH: Number if indices isn't divisible by 3");
				}

				curMesh->mNumFaces = curMesh->mNumVertices / 3;
				curMesh->mFaces = new aiFace[curMesh->mNumFaces];

				// setup some members
				curMesh->mMaterialIndex = (unsigned int)materials.size();
				curMesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

				// allocate storage for all vertices
				curMesh->mVertices = new aiVector3D[curMesh->mNumVertices];

				if (curNormals.size() == curVertices.size())	{
					curMesh->mNormals = new aiVector3D[curMesh->mNumVertices];
				}
				if (curTangents.size() == curVertices.size())	{
					curMesh->mTangents = new aiVector3D[curMesh->mNumVertices];
				}
				if (curBitangents.size() == curVertices.size())	{
					curMesh->mBitangents = new aiVector3D[curMesh->mNumVertices];
				}
				if (curColors.size() == curVertices.size() && useColors)	{
					curMesh->mColors[0] = new aiColor4D[curMesh->mNumVertices];
				}
				if (curUVs.size() == curVertices.size())	{
					curMesh->mTextureCoords[0] = new aiVector3D[curMesh->mNumVertices];
				}
				if (curUV2s.size() == curVertices.size())	{
					curMesh->mTextureCoords[1] = new aiVector3D[curMesh->mNumVertices];
				}
			}
			break;

		case EXN_TEXT:
			{
			const char* sz = reader->getNodeData();
			if (textMeaning == 1)	{
				textMeaning = 0;

				// read vertices
				do	{
					SkipSpacesAndLineEnd(&sz);
					aiVector3D temp;aiColor4D c;

					// Read the vertex position
					sz = fast_atof_move(sz,(float&)temp.x);
					SkipSpaces(&sz);

					sz = fast_atof_move(sz,(float&)temp.y);
					SkipSpaces(&sz);

					sz = fast_atof_move(sz,(float&)temp.z);
					SkipSpaces(&sz);
					curVertices.push_back(temp);

					// Read the vertex normals
					sz = fast_atof_move(sz,(float&)temp.x);
					SkipSpaces(&sz);

					sz = fast_atof_move(sz,(float&)temp.y);
					SkipSpaces(&sz);

					sz = fast_atof_move(sz,(float&)temp.z);
					SkipSpaces(&sz);
					curNormals.push_back(temp);

					// read the vertex colors
					uint32_t clr = strtol16(sz,&sz);	
					ColorFromARGBPacked(clr,c);

					if (!curColors.empty() && c != *(curColors.end()-1))
						useColors = true;

					curColors.push_back(c);
					SkipSpaces(&sz);


					// read the first UV coordinate set
					sz = fast_atof_move(sz,(float&)temp.x);
					SkipSpaces(&sz);

					sz = fast_atof_move(sz,(float&)temp.y);
					SkipSpaces(&sz);
					temp.z = 0.f;
					temp.y = 1.f - temp.y;  // DX to OGL
					curUVs.push_back(temp);

					// read the (optional) second UV coordinate set
					if (vertexFormat == 1)	{
						sz = fast_atof_move(sz,(float&)temp.x);
						SkipSpaces(&sz);

						sz = fast_atof_move(sz,(float&)temp.y);
						temp.y = 1.f - temp.y; // DX to OGL
						curUV2s.push_back(temp);
					}
					// read optional tangent and bitangent vectors
					else if (vertexFormat == 2)	{
						// tangents
						sz = fast_atof_move(sz,(float&)temp.x);
						SkipSpaces(&sz);

						sz = fast_atof_move(sz,(float&)temp.z);
						SkipSpaces(&sz);

						sz = fast_atof_move(sz,(float&)temp.y);
						SkipSpaces(&sz);
						temp.y *= -1.0f;
						curTangents.push_back(temp);

						// bitangents
						sz = fast_atof_move(sz,(float&)temp.x);
						SkipSpaces(&sz);

						sz = fast_atof_move(sz,(float&)temp.z);
						SkipSpaces(&sz);

						sz = fast_atof_move(sz,(float&)temp.y);
						SkipSpaces(&sz);
						temp.y *= -1.0f;
						curBitangents.push_back(temp);
					}
				}

				/* IMPORTANT: We assume that each vertex is specified in one
				   line. So we can skip the rest of the line - unknown vertex
				   elements are ignored.
				 */

				while (SkipLine(&sz));
			}
			else if (textMeaning == 2)	{
				textMeaning = 0;

				// read indices
				aiFace* curFace = curMesh->mFaces;
				aiFace* const faceEnd = curMesh->mFaces  + curMesh->mNumFaces;

				aiVector3D* pcV  = curMesh->mVertices;
				aiVector3D* pcN  = curMesh->mNormals;
				aiVector3D* pcT  = curMesh->mTangents;
				aiVector3D* pcB  = curMesh->mBitangents;
				aiColor4D* pcC0  = curMesh->mColors[0];
				aiVector3D* pcT0 = curMesh->mTextureCoords[0];
				aiVector3D* pcT1 = curMesh->mTextureCoords[1];

				unsigned int curIdx = 0;
				unsigned int total = 0;
				while(SkipSpacesAndLineEnd(&sz))	{
					if (curFace >= faceEnd)	{
						DefaultLogger::get()->error("IRRMESH: Too many indices");
						break;
					}
					if (!curIdx)	{
						curFace->mNumIndices = 3;
						curFace->mIndices = new unsigned int[3];
					}

					unsigned int idx = strtol10(sz,&sz);
					if (idx >= curVertices.size())	{
						DefaultLogger::get()->error("IRRMESH: Index out of range");
						idx = 0;
					}

					curFace->mIndices[curIdx] = total++;

					*pcV++ = curVertices[idx];
					if (pcN)*pcN++ = curNormals[idx];
					if (pcT)*pcT++ = curTangents[idx];
					if (pcB)*pcB++ = curBitangents[idx];
					if (pcC0)*pcC0++ = curColors[idx];
					if (pcT0)*pcT0++ = curUVs[idx];
					if (pcT1)*pcT1++ = curUV2s[idx];

					if (++curIdx == 3)	{
						++curFace;
						curIdx = 0;
					}
				}

				if (curFace != faceEnd)
					DefaultLogger::get()->error("IRRMESH: Not enough indices");

				// Finish processing the mesh - do some small material workarounds
				if (curMatFlags & AI_IRRMESH_MAT_trans_vertex_alpha && !useColors)	{
					// Take the opacity value of the current material
					// from the common vertex color alpha
					MaterialHelper* mat = (MaterialHelper*)curMat;
					mat->AddProperty(&curColors[0].a,1,AI_MATKEY_OPACITY);
				}
			}}
			break;

			default:

				// GCC complains here ...
				break;

		};
	}

	// End of the last buffer. A material and a mesh should be there
	if (curMat || curMesh)	{
		if ( !curMat || !curMesh)	{
			DefaultLogger::get()->error("IRRMESH: A buffer must contain a mesh and a material");
			delete curMat;
			delete curMesh;
		}
		else	{
			materials.push_back(curMat); 
			meshes.push_back(curMesh);  
		}
	}

	if (materials.empty())
		throw new ImportErrorException("IRRMESH: Unable to read a mesh from this file");


	// now generate the output scene
	pScene->mNumMeshes = (unsigned int)meshes.size();
	pScene->mMeshes = new aiMesh*[pScene->mNumMeshes];
	for (unsigned int i = 0; i < pScene->mNumMeshes;++i)	{
		pScene->mMeshes[i] = meshes[i];

		// clean this value ...
		pScene->mMeshes[i]->mNumUVComponents[3] = 0;
	}

	pScene->mNumMaterials = (unsigned int)materials.size();
	pScene->mMaterials = new aiMaterial*[pScene->mNumMaterials];
	::memcpy(pScene->mMaterials,&materials[0],sizeof(void*)*pScene->mNumMaterials);

	pScene->mRootNode = new aiNode();
	pScene->mRootNode->mName.Set("<IRRMesh>");
	pScene->mRootNode->mNumMeshes = pScene->mNumMeshes;
	pScene->mRootNode->mMeshes = new unsigned int[pScene->mNumMeshes];

	for (unsigned int i = 0; i < pScene->mNumMeshes;++i)
		pScene->mRootNode->mMeshes[i] = i;

	// clean up and return
	delete reader;
	AI_DEBUG_INVALIDATE_PTR(reader);
}