assimp/code/FindInvalidDataProcess.cpp

/*
---------------------------------------------------------------------------
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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  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/

/** @file Defines a post processing step to search an importer's output
    for data that is obviously invalid  */

#include "AssimpPCH.h"

#ifndef AI_BUILD_NO_FINDINVALIDDATA_PROCESS

// internal headers
#include "FindInvalidDataProcess.h"
#include "ProcessHelper.h"

using namespace Assimp;

// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
FindInvalidDataProcess::FindInvalidDataProcess()
{
	// nothing to do here
}

// ------------------------------------------------------------------------------------------------
// Destructor, private as well
FindInvalidDataProcess::~FindInvalidDataProcess()
{
	// nothing to do here
}

// ------------------------------------------------------------------------------------------------
// Returns whether the processing step is present in the given flag field.
bool FindInvalidDataProcess::IsActive( unsigned int pFlags) const
{
	// this step is always active
	return true;
}

// ------------------------------------------------------------------------------------------------
// Update mesh references in the node graph
void UpdateMeshReferences(aiNode* node, const std::vector<unsigned int>& meshMapping)
{
	if (node->mNumMeshes)
	{
		unsigned int out = 0;
		for (unsigned int a = 0; a < node->mNumMeshes;++a)
		{
			register unsigned int ref = node->mMeshes[a];
			if (0xffffffff != (ref = meshMapping[ref]))
			{
				node->mMeshes[out++] = ref;
			}
		}
		// just let the members that are unused, that's much cheaper
		// than a full array realloc'n'copy party ...
		if(!(node->mNumMeshes = out))
		{
			delete[] node->mMeshes;
			node->mMeshes = NULL;
		}
	}
	// recursively update all children
	for (unsigned int i = 0; i < node->mNumChildren;++i)
		UpdateMeshReferences(node->mChildren[i],meshMapping);
}

// ------------------------------------------------------------------------------------------------
// Executes the post processing step on the given imported data.
void FindInvalidDataProcess::Execute( aiScene* pScene)
{
	DefaultLogger::get()->debug("FindInvalidDataProcess begin");

	bool out = false;
	std::vector<unsigned int> meshMapping(pScene->mNumMeshes);
	unsigned int real = 0;	

	for( unsigned int a = 0; a < pScene->mNumMeshes; a++)
	{
		int result;
		if ((result = ProcessMesh( pScene->mMeshes[a])))
		{
			out = true;
			if (2 == result)
			{
				// remove this mesh
				delete pScene->mMeshes[a];
				AI_DEBUG_INVALIDATE_PTR(pScene->mMeshes[a]);

				meshMapping[a] = 0xffffffff;
				continue;
			}
		}
		pScene->mMeshes[real] = pScene->mMeshes[a];
		meshMapping[a] = real++;
	}

	if (out)
	{
		if ( real != pScene->mNumMeshes)
		{
			if (!real)
				throw new ImportErrorException("No meshes remaining");

			
			// we need to remove some meshes.
			// therefore we'll also need to remove all references
			// to them from the scenegraph 
			UpdateMeshReferences(pScene->mRootNode,meshMapping);
			pScene->mNumMeshes = real;
		}

		DefaultLogger::get()->info("FindInvalidDataProcess finished. Found issues ...");
	}
	else DefaultLogger::get()->debug("FindInvalidDataProcess finished. Everything seems to be OK.");
}

// ------------------------------------------------------------------------------------------------
template <typename T>
inline const char* ValidateArrayContents(const T* arr, unsigned int size,
	const std::vector<bool>& dirtyMask)
{
	return NULL;
}

// ------------------------------------------------------------------------------------------------
template <>
inline const char* ValidateArrayContents<aiVector3D>(const aiVector3D* arr, unsigned int size,
	const std::vector<bool>& dirtyMask)
{
	bool b = false;
	for (unsigned int i = 0; i < size;++i)
	{
		if (dirtyMask.size() && dirtyMask[i])continue;

		const aiVector3D& v = arr[i];
		if (is_special_float(v.x) || is_special_float(v.y) || is_special_float(v.z))
		{
			return "INF/NAN was found in a vector component";
		}
		if (i && v != arr[i-1])b = true;
	}
	if (!b)
		return "All vectors are identical";
	return NULL;
}

// ------------------------------------------------------------------------------------------------
template <typename T>
inline bool ProcessArray(T*& in, unsigned int num,const char* name,
	const std::vector<bool>& dirtyMask)
{
	const char* err = ValidateArrayContents(in,num,dirtyMask);
	if (err)
	{
		DefaultLogger::get()->error(std::string("FindInvalidDataProcess fails on mesh ") + name + ": " + err);
		
		delete[] in;
		in = NULL;
		return true;
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
// Executes the post processing step on the given imported data.
int FindInvalidDataProcess::ProcessMesh (aiMesh* pMesh)
{
	bool ret = false;
	std::vector<bool> dirtyMask;

	// process vertex positions
	if(pMesh->mVertices && ProcessArray(pMesh->mVertices,pMesh->mNumVertices,"positions",dirtyMask))
	{
		DefaultLogger::get()->error("Deleting mesh: Unable to continue without vertex positions");
		return 2;
	}

	// process texture coordinates
	for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS;++i)
	{
		if (!pMesh->mTextureCoords[i])break;
		if (ProcessArray(pMesh->mTextureCoords[i],pMesh->mNumVertices,"uvcoords",dirtyMask))
		{
			// delete all subsequent texture coordinate sets.
			for (unsigned int a = i+1; a < AI_MAX_NUMBER_OF_TEXTURECOORDS;++a)
			{
				delete[] pMesh->mTextureCoords[a]; pMesh->mTextureCoords[a] = NULL;
			}
			ret = true;
		}
	}

	// -- we don't validate vertex colors, it's difficult to say whether
	// they are invalid or not.

	// normals and tangents are undefined for point and line faces.
	// we generate a small lookup table in which we mark all
	// indices into the normals/tangents array that MAY be invalid
	if (pMesh->mNormals || pMesh->mTangents)
	{
		if (aiPrimitiveType_POINT & pMesh->mPrimitiveTypes ||
			aiPrimitiveType_LINE  & pMesh->mPrimitiveTypes)
		{
			if (aiPrimitiveType_TRIANGLE & pMesh->mPrimitiveTypes ||
				aiPrimitiveType_POLYGON  & pMesh->mPrimitiveTypes)
			{
				// we need the lookup table
				dirtyMask.resize(pMesh->mNumVertices,false);
				for (unsigned int m = 0; m < pMesh->mNumFaces;++m)
				{
					const aiFace& f = pMesh->mFaces[m];
					if (2 == f.mNumIndices)
					{
						dirtyMask[f.mIndices[0]] = dirtyMask[f.mIndices[1]] = true;
					}
					else if (1 == f.mNumIndices)dirtyMask[f.mIndices[0]] = true;
				}
			}
			else return ret;
		}

		// process mesh normals
		if (pMesh->mNormals && ProcessArray(pMesh->mNormals,pMesh->mNumVertices,"normals",dirtyMask))
			ret = true;

		// process mesh tangents
		if (pMesh->mTangents && ProcessArray(pMesh->mTangents,pMesh->mNumVertices,"tangents",dirtyMask))
		{
			delete[] pMesh->mBitangents; pMesh->mBitangents = NULL;
			ret = true;
		}

		// process mesh bitangents
		if (pMesh->mBitangents && ProcessArray(pMesh->mBitangents,pMesh->mNumVertices,"bitangents",dirtyMask))
		{
			delete[] pMesh->mTangents; pMesh->mTangents = NULL;
			ret = true;
		}
	}
	return ret ? 1 : 0;
}


#endif // !! AI_BUILD_NO_FINDINVALIDDATA_PROCESS