assimp/code/OgreMesh.cpp

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

Copyright (c) 2006-2012, assimp team
All rights reserved.

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with or without modification, are permitted provided that the 
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  following disclaimer.

* Redistributions in binary form must reproduce the above
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/

#include "AssimpPCH.h"

#ifndef ASSIMP_BUILD_NO_OGRE_IMPORTER

#include "OgreImporter.hpp"
#include "TinyFormatter.h"

using namespace std;

namespace Assimp
{
namespace Ogre
{

void OgreImporter::ReadSubMesh(const unsigned int submeshIndex, SubMesh &submesh, XmlReader *reader)
{
	if (reader->getAttributeValue("material"))
		submesh.MaterialName = GetAttribute<string>(reader, "material");
	if (reader->getAttributeValue("use32bitindexes"))
		submesh.Use32bitIndexes = GetAttribute<bool>(reader, "use32bitindexes");
	if (reader->getAttributeValue("usesharedvertices"))
		submesh.UseSharedGeometry = GetAttribute<bool>(reader, "usesharedvertices");

	DefaultLogger::get()->debug(Formatter::format() << "Reading submesh " << submeshIndex);
	DefaultLogger::get()->debug(Formatter::format() << "  - Material '" << submesh.MaterialName << "'");
	DefaultLogger::get()->debug(Formatter::format() << "  - Shader geometry = " << (submesh.UseSharedGeometry ? "true" : "false") << 
													   ", 32bit indexes = " << (submesh.Use32bitIndexes ? "true" : "false"));

	//TODO: maybe we have alsways just 1 faces and 1 geometry and always in this order. this loop will only work correct, when the order
	//of faces and geometry changed, and not if we have more than one of one
	/// @todo Fix above comment with better read logic below

	NextNode(reader);
	string currentNodeName = reader->getNodeName();

	const string nnFaces           = "faces";
	const string nnFace            = "face";
	const string nnGeometry        = "geometry";
	const string nnBoneAssignments = "boneassignments";
	const string nnVertexBuffer    = "vertexbuffer";

	bool quadWarned = false;

	while(currentNodeName == nnFaces    ||
		  currentNodeName == nnGeometry ||
		  currentNodeName == nnBoneAssignments)
	{
		if (currentNodeName == nnFaces)
		{
			unsigned int numFaces = GetAttribute<unsigned int>(reader, "count");

			NextNode(reader);
			currentNodeName = reader->getNodeName();

			while(currentNodeName == nnFace)
			{
				Face NewFace;
				NewFace.VertexIndices[0] = GetAttribute<int>(reader, "v1");
				NewFace.VertexIndices[1] = GetAttribute<int>(reader, "v2");
				NewFace.VertexIndices[2] = GetAttribute<int>(reader, "v3");

				/// @todo Support quads
				if (!quadWarned && reader->getAttributeValue("v4"))
					DefaultLogger::get()->warn("Submesh has quads, only triangles are supported at the moment!");

				submesh.Faces.push_back(NewFace);

				// Advance
				NextNode(reader);
				currentNodeName = reader->getNodeName();
			}

			if (submesh.Faces.size() == numFaces)
				DefaultLogger::get()->debug(Formatter::format() << "  - Faces " << numFaces);
			else
				throw DeadlyImportError(Formatter::format() << "Read only " << submesh.Faces.size() << " faces when should have read " << numFaces);
		}
		else if (currentNodeName == nnGeometry)
		{	
			unsigned int numVertices = GetAttribute<int>(reader, "vertexcount");

			NextNode(reader);
			while(string(reader->getNodeName()) == nnVertexBuffer)
				ReadVertexBuffer(submesh, reader, numVertices);
		}
		else if (reader->getNodeName() == nnBoneAssignments)
			ReadBoneWeights(submesh, reader);
			
		currentNodeName = reader->getNodeName();
	}
}

void OgreImporter::ReadVertexBuffer(SubMesh &submesh, XmlReader *reader, const unsigned int numVertices)
{
	DefaultLogger::get()->debug(Formatter::format() << "Reading vertex buffer with " << numVertices << " vertices");
	
	submesh.HasGeometry = true;

	if (reader->getAttributeValue("positions") && GetAttribute<bool>(reader, "positions"))
	{
		submesh.HasPositions = true;
		submesh.Positions.reserve(numVertices);
		DefaultLogger::get()->debug("  - Has positions");
	}
	if (reader->getAttributeValue("normals") && GetAttribute<bool>(reader, "normals"))
	{
		submesh.HasNormals = true;
		submesh.Normals.reserve(numVertices);
		DefaultLogger::get()->debug("  - Has normals");
	}
	if (reader->getAttributeValue("tangents") && GetAttribute<bool>(reader, "tangents"))
	{
		submesh.HasTangents = true;
		submesh.Tangents.reserve(numVertices);
		DefaultLogger::get()->debug("  - Has tangents");
	}
	if (reader->getAttributeValue("texture_coords"))
	{
		submesh.Uvs.resize(GetAttribute<unsigned int>(reader, "texture_coords"));
		for(size_t i=0, len=submesh.Uvs.size(); i<len; ++i)
			submesh.Uvs[i].reserve(numVertices);
		DefaultLogger::get()->debug(Formatter::format() << "  - Has " << submesh.Uvs.size() << " texture coords");
	}

	if (!submesh.HasPositions)
		throw DeadlyImportError("Vertex buffer does not contain positions!");

	const string nnVertex        = "vertex";
	const string nnPosition      = "position";
	const string nnNormal        = "normal";
	const string nnTangent       = "tangent";
	const string nnBinormal      = "binormal";
	const string nnTexCoord      = "texcoord";
	const string nnColorDiffuse  = "colour_diffuse";
	const string nnColorSpecular = "colour_specular";
	
	bool warnBinormal = true;
	bool warnColorDiffuse = true;
	bool warnColorSpecular = true;
	
	NextNode(reader);
	string currentNodeName = reader->getNodeName();

	/// @todo Make this loop nicer.
	while(currentNodeName == nnVertex       ||
		  currentNodeName == nnPosition     ||
		  currentNodeName == nnNormal       ||
		  currentNodeName == nnTangent      ||
		  currentNodeName == nnBinormal     ||
		  currentNodeName == nnTexCoord     ||
		  currentNodeName == nnColorDiffuse ||
		  currentNodeName == nnColorSpecular)
	{
		if (currentNodeName == nnVertex)
		{
			NextNode(reader);
			currentNodeName = reader->getNodeName();
		}
		
		/// @todo Implement nnBinormal, nnColorDiffuse and nnColorSpecular

		if (submesh.HasPositions && currentNodeName == nnPosition)
		{
			aiVector3D NewPos;
			NewPos.x = GetAttribute<float>(reader, "x");
			NewPos.y = GetAttribute<float>(reader, "y");
			NewPos.z = GetAttribute<float>(reader, "z");
			submesh.Positions.push_back(NewPos);
		}
		else if (submesh.HasNormals && currentNodeName == nnNormal)
		{
			aiVector3D NewNormal;
			NewNormal.x = GetAttribute<float>(reader, "x");
			NewNormal.y = GetAttribute<float>(reader, "y");
			NewNormal.z = GetAttribute<float>(reader, "z");
			submesh.Normals.push_back(NewNormal);
		}
		else if (submesh.HasTangents && currentNodeName == nnTangent)
		{
			aiVector3D NewTangent;
			NewTangent.x = GetAttribute<float>(reader, "x");
			NewTangent.y = GetAttribute<float>(reader, "y");
			NewTangent.z = GetAttribute<float>(reader, "z");
			submesh.Tangents.push_back(NewTangent);
		}
		else if (submesh.Uvs.size() > 0 && currentNodeName == nnTexCoord)
		{
			for(size_t i=0, len=submesh.Uvs.size(); i<len; ++i)
			{
				if (currentNodeName != nnTexCoord)
					throw DeadlyImportError("Vertex buffer declared more UVs than can be found in a vertex");

				aiVector3D NewUv;
				NewUv.x = GetAttribute<float>(reader, "u");
				NewUv.y = GetAttribute<float>(reader, "v") * (-1)+1; //flip the uv vertikal, blender exports them so! (ahem... @todo ????)
				submesh.Uvs[i].push_back(NewUv);
				
				NextNode(reader);
				currentNodeName = reader->getNodeName();
			}
			// Continue main loop as above already read next node
			continue;
		}
		else
		{
			/// @todo Remove this stuff once implemented. We only want to log warnings once per element.
			bool warn = true;
			if (currentNodeName == nnBinormal)
			{
				if (warnBinormal)
					warnBinormal = false;
				else
					warn = false;
			}
			else if (currentNodeName == nnColorDiffuse)
			{
				if (warnColorDiffuse)
					warnColorDiffuse = false;
				else
					warn = false;
			}
			else if (currentNodeName == nnColorSpecular)
			{
				if (warnColorSpecular)
					warnColorSpecular = false;
				else
					warn = false;
			}
			if (warn)
				DefaultLogger::get()->warn(string("Vertex buffer attribute read not implemented for element: ") + currentNodeName);
		}

		// Advance
		NextNode(reader);
		currentNodeName = reader->getNodeName();
	}

	DefaultLogger::get()->debug(Formatter::format() <<
		"  - Positions " << submesh.Positions.size() <<
		" Normals "   << submesh.Normals.size() <<
		" TexCoords " << submesh.Uvs.size() <<
		" Tangents "  << submesh.Tangents.size());

	// Sanity checks
	if (submesh.HasNormals && submesh.Normals.size() != numVertices)
		throw DeadlyImportError(Formatter::format() << "Read only " << submesh.Normals.size() << " normals when should have read " << numVertices);
	if (submesh.HasTangents && submesh.Tangents.size() != numVertices)
		throw DeadlyImportError(Formatter::format() << "Read only " << submesh.Tangents.size() << " tangents when should have read " << numVertices);
	for(unsigned int i=0; i<submesh.Uvs.size(); ++i)
	{
		if (submesh.Uvs[i].size() != numVertices)
			throw DeadlyImportError(Formatter::format() << "Read only " << submesh.Uvs[i].size() 
				<< " uvs for uv index " << i << " when should have read " << numVertices);
	}
}

void OgreImporter::ReadBoneWeights(SubMesh &submesh, XmlReader *reader)
{
	submesh.Weights.resize(submesh.Positions.size());

	unsigned int numRead = 0;
	const string nnVertexBoneAssignment = "vertexboneassignment";

	NextNode(reader);
	while(CurrentNodeNameEquals(reader, nnVertexBoneAssignment))
	{
		numRead++;

		BoneWeight weight;
		weight.Id = GetAttribute<int>(reader, "boneindex");
		weight.Value = GetAttribute<float>(reader, "weight");
		
		//calculate the number of bones used (this is the highest id +1 becuase bone ids start at 0)
		/// @todo This can probably be refactored to something else.
		submesh.BonesUsed = max(submesh.BonesUsed, weight.Id+1);

		const unsigned int vertexId = GetAttribute<int>(reader, "vertexindex");
		submesh.Weights[vertexId].push_back(weight);
		
		NextNode(reader);
	}
	DefaultLogger::get()->debug(Formatter::format() << "  - Bone weights " << numRead);
}

void OgreImporter::ProcessSubMesh(SubMesh &submesh, SubMesh &sharedGeometry)
{
	//---------------Make all Vertexes unique: (this is required by assimp)-----------------------
	vector<Face> UniqueFaceList(submesh.Faces.size());
	unsigned int UniqueVertexCount=submesh.Faces.size()*3;//*3 because each face consists of 3 vertexes, because we only support triangles^^

	vector<aiVector3D> UniquePositions(UniqueVertexCount);

	vector<aiVector3D> UniqueNormals(UniqueVertexCount);

	vector<aiVector3D> UniqueTangents(UniqueVertexCount);

	vector< vector<BoneWeight> > UniqueWeights(UniqueVertexCount);

	vector< vector<aiVector3D> > UniqueUvs(submesh.Uvs.size());
	for(unsigned int i=0; i<UniqueUvs.size(); ++i)	UniqueUvs[i].resize(UniqueVertexCount);



	//Support for shared data:
	/*We can use this loop to copy vertex informations from the shared data pool. In order to do so
	  we just use a reference to a submodel instead of our submodel itself*/

	SubMesh& VertexSource= submesh.UseSharedGeometry ? sharedGeometry : submesh;
	if(submesh.UseSharedGeometry)//copy vertexinformations to our mesh:
	{
		submesh.HasPositions=sharedGeometry.HasPositions;
		submesh.HasNormals=sharedGeometry.HasNormals;
		submesh.HasTangents=sharedGeometry.HasTangents;

		submesh.BonesUsed=sharedGeometry.BonesUsed;

		UniqueUvs.resize(sharedGeometry.Uvs.size());
		for(unsigned int i=0; i<UniqueUvs.size(); ++i)	UniqueUvs[i].resize(UniqueVertexCount);
	}

	for(unsigned int i=0; i<submesh.Faces.size(); ++i)
	{
		//We precalculate the index vlaues her, because we need them in all vertex attributes
		unsigned int Vertex1=submesh.Faces[i].VertexIndices[0];
		unsigned int Vertex2=submesh.Faces[i].VertexIndices[1];
		unsigned int Vertex3=submesh.Faces[i].VertexIndices[2];

		UniquePositions[3*i+0]=VertexSource.Positions[Vertex1];
		UniquePositions[3*i+1]=VertexSource.Positions[Vertex2];
		UniquePositions[3*i+2]=VertexSource.Positions[Vertex3];

		if(VertexSource.HasNormals)
		{
			UniqueNormals[3*i+0]=VertexSource.Normals[Vertex1];
			UniqueNormals[3*i+1]=VertexSource.Normals[Vertex2];
			UniqueNormals[3*i+2]=VertexSource.Normals[Vertex3];
		}

		if(VertexSource.HasTangents)
		{
			UniqueTangents[3*i+0]=VertexSource.Tangents[Vertex1];
			UniqueTangents[3*i+1]=VertexSource.Tangents[Vertex2];
			UniqueTangents[3*i+2]=VertexSource.Tangents[Vertex3];
		}

		if(UniqueUvs.size()>0)
		{
			for(unsigned int j=0; j<UniqueUvs.size(); ++j)
			{
				UniqueUvs[j][3*i+0]=VertexSource.Uvs[j][Vertex1];
				UniqueUvs[j][3*i+1]=VertexSource.Uvs[j][Vertex2];
				UniqueUvs[j][3*i+2]=VertexSource.Uvs[j][Vertex3];
			}
		}

		if(VertexSource.Weights.size() > 0)
		{
			UniqueWeights[3*i+0]=VertexSource.Weights[Vertex1];
			UniqueWeights[3*i+1]=VertexSource.Weights[Vertex2];
			UniqueWeights[3*i+2]=VertexSource.Weights[Vertex3];
		}

		//The indexvalues a just continuous numbers (0, 1, 2, 3, 4, 5, 6...)
		UniqueFaceList[i].VertexIndices[0]=3*i+0;
		UniqueFaceList[i].VertexIndices[1]=3*i+1;
		UniqueFaceList[i].VertexIndices[2]=3*i+2;
	}
	//_________________________________________________________________________________________

	//now we have the unique datas, but want them in the SubMesh, so we swap all the containers:
	//if we don't have one of them, we just swap empty containers, so everything is ok
	submesh.Faces.swap(UniqueFaceList);
	submesh.Positions.swap(UniquePositions);
	submesh.Normals.swap(UniqueNormals);
	submesh.Tangents.swap(UniqueTangents);
	submesh.Uvs.swap(UniqueUvs);
	submesh.Weights.swap(UniqueWeights);



	//------------- normalize weights -----------------------------
	//The Blender exporter doesn't care about whether the sum of all boneweights for a single vertex equals 1 or not,
	//so we have to make this sure:
	for(unsigned int VertexId=0; VertexId<submesh.Weights.size(); ++VertexId)//iterate over all vertices
	{
		float WeightSum=0.0f;
		for(unsigned int BoneId=0; BoneId<submesh.Weights[VertexId].size(); ++BoneId)//iterate over all bones
		{
			WeightSum+=submesh.Weights[VertexId][BoneId].Value;
		}
		
		//check if the sum is too far away from 1
		if(WeightSum<1.0f-0.05f || WeightSum>1.0f+0.05f)
		{
			//normalize all weights:
			for(unsigned int BoneId=0; BoneId<submesh.Weights[VertexId].size(); ++BoneId)//iterate over all bones
			{
				submesh.Weights[VertexId][BoneId].Value/=WeightSum;
			}
		}
	}
	//_________________________________________________________
}




aiMesh* OgreImporter::CreateAssimpSubMesh(const SubMesh& submesh, const vector<Bone>& bones) const
{
	const aiScene* const m_CurrentScene=this->m_CurrentScene;//make sure, that we can access but not change the scene
	(void)m_CurrentScene;

	aiMesh* NewAiMesh=new aiMesh();
		
	//Positions
	NewAiMesh->mVertices=new aiVector3D[submesh.Positions.size()];
	memcpy(NewAiMesh->mVertices, &submesh.Positions[0], submesh.Positions.size()*sizeof(aiVector3D));
	NewAiMesh->mNumVertices=submesh.Positions.size();

	//Normals
	if(submesh.HasNormals)
	{
		NewAiMesh->mNormals=new aiVector3D[submesh.Normals.size()];
		memcpy(NewAiMesh->mNormals, &submesh.Normals[0], submesh.Normals.size()*sizeof(aiVector3D));
	}


	//until we have support for bitangents, no tangents will be written
	/*
	//Tangents
	if(submesh.HasTangents)
	{
		NewAiMesh->mTangents=new aiVector3D[submesh.Tangents.size()];
		memcpy(NewAiMesh->mTangents, &submesh.Tangents[0], submesh.Tangents.size()*sizeof(aiVector3D));
	}
	*/

	//Uvs
	if(submesh.Uvs.size()>0)
	{
		for(unsigned int i=0; i<submesh.Uvs.size(); ++i)
		{
			NewAiMesh->mNumUVComponents[i]=2;
			NewAiMesh->mTextureCoords[i]=new aiVector3D[submesh.Uvs[i].size()];
			memcpy(NewAiMesh->mTextureCoords[i], &(submesh.Uvs[i][0]), submesh.Uvs[i].size()*sizeof(aiVector3D));
		}
	}


	//---------------------------------------- bones --------------------------------------------

	//Copy the weights in in Bone-Vertices Struktur
	//(we have them in a Vertex-bones Structur, this is much easier for making them unique, which is required by assimp
	vector< vector<aiVertexWeight> > aiWeights(submesh.BonesUsed);//now the outer list are the bones, and the inner vector the vertices
	for(unsigned int VertexId=0; VertexId<submesh.Weights.size(); ++VertexId)//iterate over all vertices
	{
		for(unsigned int BoneId=0; BoneId<submesh.Weights[VertexId].size(); ++BoneId)//iterate over all bones
		{
			aiVertexWeight NewWeight;
			NewWeight.mVertexId=VertexId;//the current Vertex, we can't use the Id form the submehs weights, because they are bone id's
			NewWeight.mWeight=submesh.Weights[VertexId][BoneId].Value;
			aiWeights[submesh.Weights[VertexId][BoneId].Id].push_back(NewWeight);
		}
	}

	

	vector<aiBone*> aiBones;
	aiBones.reserve(submesh.BonesUsed);//the vector might be smaller, because there might be empty bones (bones that are not attached to any vertex)
	
	//create all the bones and fill them with informations
	for(unsigned int i=0; i<submesh.BonesUsed; ++i)
	{
		if(aiWeights[i].size()>0)
		{
			aiBone* NewBone=new aiBone();
			NewBone->mNumWeights=aiWeights[i].size();
			NewBone->mWeights=new aiVertexWeight[aiWeights[i].size()];
			memcpy(NewBone->mWeights, &(aiWeights[i][0]), sizeof(aiVertexWeight)*aiWeights[i].size());
			NewBone->mName=bones[i].Name;//The bone list should be sorted after its id's, this was done in LoadSkeleton
			NewBone->mOffsetMatrix=bones[i].BoneToWorldSpace;
				
			aiBones.push_back(NewBone);
		}
	}
	NewAiMesh->mNumBones=aiBones.size();
	
	// mBones must be NULL if mNumBones is non 0 or the validation fails.
	if (aiBones.size()) {
		NewAiMesh->mBones=new aiBone* [aiBones.size()];
		memcpy(NewAiMesh->mBones, &(aiBones[0]), aiBones.size()*sizeof(aiBone*));
	}

	//______________________________________________________________________________________________________



	//Faces
	NewAiMesh->mFaces=new aiFace[submesh.Faces.size()];
	for(unsigned int i=0; i<submesh.Faces.size(); ++i)
	{
		NewAiMesh->mFaces[i].mNumIndices=3;
		NewAiMesh->mFaces[i].mIndices=new unsigned int[3];

		NewAiMesh->mFaces[i].mIndices[0]=submesh.Faces[i].VertexIndices[0];
		NewAiMesh->mFaces[i].mIndices[1]=submesh.Faces[i].VertexIndices[1];
		NewAiMesh->mFaces[i].mIndices[2]=submesh.Faces[i].VertexIndices[2];
	}
	NewAiMesh->mNumFaces=submesh.Faces.size();

	//Link the material:
	NewAiMesh->mMaterialIndex=submesh.MaterialIndex;//the index is set by the function who called ReadSubMesh

	return NewAiMesh;
}


}//namespace Ogre
}//namespace Assimp

#endif  // !! ASSIMP_BUILD_NO_OGRE_IMPORTER