assimp/code/ValidateDataStructure.cpp

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

Copyright (c) 2006-2008, ASSIMP Development Team

All rights reserved.

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* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
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  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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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/

/** @file Implementation of the post processing step to validate 
 * the data structure returned by Assimp
 */

#include "AssimpPCH.h"

// internal headers
#include "ValidateDataStructure.h"
#include "BaseImporter.h"
#include "fast_atof.h"


// CRT headers
#include <stdarg.h>

using namespace Assimp;

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

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

// ------------------------------------------------------------------------------------------------
// Returns whether the processing step is present in the given flag field.
bool ValidateDSProcess::IsActive( unsigned int pFlags) const
{
	return (pFlags & aiProcess_ValidateDataStructure) != 0;
}
// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::ReportError(const char* msg,...)
{
	ai_assert(NULL != msg);

	va_list args;
	va_start(args,msg);

	char szBuffer[3000];

	int iLen;
	iLen = vsprintf(szBuffer,msg,args);

	if (0 >= iLen)
	{
		// :-) should not happen ...
		throw new ImportErrorException("Idiot ... learn coding!");
	}
	va_end(args);
#ifdef _DEBUG
	aiAssert( false,szBuffer,__LINE__,__FILE__ );
#endif
	throw new ImportErrorException("Validation failed: " + std::string(szBuffer,iLen));
}
// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::ReportWarning(const char* msg,...)
{
	ai_assert(NULL != msg);

	va_list args;
	va_start(args,msg);

	char szBuffer[3000];

	int iLen;
	iLen = vsprintf(szBuffer,msg,args);

	if (0 >= iLen)
	{
		// :-) should not happen ...
		throw new ImportErrorException("Idiot ... learn coding!");
	}
	va_end(args);
	DefaultLogger::get()->warn("Validation warning: " + std::string(szBuffer,iLen));
}

// ------------------------------------------------------------------------------------------------
inline int HasNameMatch(const aiString& in, aiNode* node)
{
	int result = (node->mName == in ? 1 : 0 );
	for (unsigned int i = 0; i < node->mNumChildren;++i)
	{
		result += HasNameMatch(in,node->mChildren[i]);
	}
	return result;
}

// ------------------------------------------------------------------------------------------------
template <typename T>
inline void ValidateDSProcess::DoValidation(T** parray, unsigned int size, 
	const char* firstName, const char* secondName)
{
	// validate all entries
	if (size)
	{
		if (!parray)
		{
			ReportError("aiScene::%s is NULL (aiScene::%s is %i)",
				firstName, secondName, size);
		}
		for (unsigned int i = 0; i < size;++i)
		{
			if (!parray[i])
			{
				ReportError("aiScene::%s[%i] is NULL (aiScene::%s is %i)",
					firstName,i,secondName,size);
			}
			Validate(parray[i]);
		}
	}
}

// ------------------------------------------------------------------------------------------------
template <typename T>
inline void ValidateDSProcess::DoValidationEx(T** parray, unsigned int size, 
	const char* firstName, const char* secondName)
{
	// validate all entries
	if (size)
	{
		if (!parray)
		{
			ReportError("aiScene::%s is NULL (aiScene::%s is %i)",
				firstName, secondName, size);
		}
		for (unsigned int i = 0; i < size;++i)
		{
			if (!parray[i])
			{
				ReportError("aiScene::%s[%i] is NULL (aiScene::%s is %i)",
					firstName,i,secondName,size);
			}
			Validate(parray[i]);

			// check whether there are duplicate names
			for (unsigned int a = i+1; a < size;++a)
			{
				if (parray[i]->mName == parray[a]->mName)
				{
					this->ReportError("aiScene::%s[%i] has the same name as "
						"aiScene::%s[%i]",firstName, i,secondName, a);
				}
			}
		}
	}
}

// ------------------------------------------------------------------------------------------------
template <typename T>
inline void ValidateDSProcess::DoValidationWithNameCheck(T** array, 
	unsigned int size, const char* firstName, 
	const char* secondName)
{
	// validate all entries
	DoValidationEx(array,size,firstName,secondName);
	
	for (unsigned int i = 0; i < size;++i)
	{
		int res = HasNameMatch(array[i]->mName,mScene->mRootNode);
		if (!res)
		{
			ReportError("aiScene::%s[%i] has no corresponding node in the scene graph (%s)",
				firstName,i,array[i]->mName.data);
		}
		else if (1 != res)
		{
			ReportError("aiScene::%s[%i]: there are more than one nodes with %s as name",
				firstName,i,array[i]->mName.data);
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Executes the post processing step on the given imported data.
void ValidateDSProcess::Execute( aiScene* pScene)
{
	this->mScene = pScene;
	DefaultLogger::get()->debug("ValidateDataStructureProcess begin");
	
	// validate the node graph of the scene
	Validate(pScene->mRootNode);
	
	// at least one of the mXXX arrays must be non-empty or we'll flag 
	// the sebe as invalid
	bool has = false;

	// validate all meshes
	if (pScene->mNumMeshes) 
	{
		has = true;
		DoValidation(pScene->mMeshes,pScene->mNumMeshes,"mMeshes","mNumMeshes");
	}
	else if (!(mScene->mFlags & AI_SCENE_FLAGS_INCOMPLETE))
	{
		ReportError("aiScene::mNumMeshes is 0. At least one mesh must be there");
	}
	
	// validate all animations
	if (pScene->mNumAnimations) 
	{
		has = true;
		DoValidation(pScene->mAnimations,pScene->mNumAnimations,
			"mAnimations","mNumAnimations");
	}
	
	// validate all cameras
	if (pScene->mNumCameras) 
	{
		has = true;
		DoValidationWithNameCheck(pScene->mCameras,pScene->mNumCameras,
			"mCameras","mNumCameras");
	}

	// validate all lights
	if (pScene->mNumLights) 
	{
		has = true;
		DoValidationWithNameCheck(pScene->mLights,pScene->mNumLights,
			"mLights","mNumLights");
	}
	
	// validate all materials
	if (pScene->mNumMaterials) 
	{
		has = true;
		DoValidation(pScene->mMaterials,pScene->mNumMaterials,"mMaterials","mNumMaterials");
	}
	else if (!(mScene->mFlags & AI_SCENE_FLAGS_INCOMPLETE))
	{
		ReportError("aiScene::mNumMaterials is 0. At least one material must be there");
	}

	if (!has)ReportError("The aiScene data structure is empty");
	DefaultLogger::get()->debug("ValidateDataStructureProcess end");
}

// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::Validate( const aiLight* pLight)
{
	if (pLight->mType == aiLightSource_UNDEFINED)
		ReportError("aiLight::mType is aiLightSource_UNDEFINED");

	if (!pLight->mAttenuationConstant &&
		!pLight->mAttenuationLinear   && 
		!pLight->mAttenuationQuadratic)
	{
		ReportWarning("aiLight::mAttenuationXXX - all are zero");
	}

	if (pLight->mAngleInnerCone > pLight->mAngleOuterCone)
		ReportError("aiLight::mAngleInnerCone is larger than aiLight::mAngleOuterCone");

	if (pLight->mColorDiffuse.IsBlack() && pLight->mColorAmbient.IsBlack() 
		&& pLight->mColorSpecular.IsBlack())
	{
		ReportWarning("aiLight::mColorXXX - all are black and won't have any influence");
	}
}
	
// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::Validate( const aiCamera* pCamera)
{
	if (pCamera->mClipPlaneFar <= pCamera->mClipPlaneNear)
		ReportError("aiCamera::mClipPlaneFar must be >= aiCamera::mClipPlaneNear");

	if (!pCamera->mHorizontalFOV || pCamera->mHorizontalFOV >= (float)AI_MATH_PI)
		ReportError("%f is not a valid value for aiCamera::mHorizontalFOV",pCamera->mHorizontalFOV);
}

// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::Validate( const aiMesh* pMesh)
{
	// validate the material index of the mesh
	if (pMesh->mMaterialIndex >= this->mScene->mNumMaterials)
	{
		this->ReportError("aiMesh::mMaterialIndex is invalid (value: %i maximum: %i)",
			pMesh->mMaterialIndex,this->mScene->mNumMaterials-1);
	}

	for (unsigned int i = 0; i < pMesh->mNumFaces; ++i)
	{
		aiFace& face = pMesh->mFaces[i];

		if (pMesh->mPrimitiveTypes)
		{
			switch (face.mNumIndices)
			{
			case 0:
				this->ReportError("aiMesh::mFaces[%i].mNumIndices is 0",i);
			case 1:
				if (0 == (pMesh->mPrimitiveTypes & aiPrimitiveType_POINT))
				{
					this->ReportError("aiMesh::mFaces[%i] is a POINT but aiMesh::mPrimtiveTypes "
						"does not report the POINT flag",i);
				}
				break;
			case 2:
				if (0 == (pMesh->mPrimitiveTypes & aiPrimitiveType_LINE))
				{
					this->ReportError("aiMesh::mFaces[%i] is a LINE but aiMesh::mPrimtiveTypes "
						"does not report the LINE flag",i);
				}
				break;
			case 3:
				if (0 == (pMesh->mPrimitiveTypes & aiPrimitiveType_TRIANGLE))
				{
					this->ReportError("aiMesh::mFaces[%i] is a TRIANGLE but aiMesh::mPrimtiveTypes "
						"does not report the TRIANGLE flag",i);
				}
				break;
			default:
				if (0 == (pMesh->mPrimitiveTypes & aiPrimitiveType_POLYGON))
				{
					this->ReportError("aiMesh::mFaces[%i] is a POLYGON but aiMesh::mPrimtiveTypes "
						"does not report the POLYGON flag",i);
				}
				break;
			};
		}

		if (!face.mIndices)this->ReportError("aiMesh::mFaces[%i].mIndices is NULL",i);
	}

	// positions must always be there ...
	if (!pMesh->mNumVertices || !pMesh->mVertices && !mScene->mFlags)
	{
		this->ReportError("The mesh contains no vertices");
	}

	// if tangents are there there must also be bitangent vectors ...
	if ((pMesh->mTangents != NULL) != (pMesh->mBitangents != NULL))
	{
		this->ReportError("If there are tangents there must also be bitangent vectors");
	}

	// faces, too
	if (!pMesh->mNumFaces || !pMesh->mFaces && !mScene->mFlags)
	{
		this->ReportError("The mesh contains no faces");
	}

	// now check whether the face indexing layout is correct:
	// unique vertices, pseudo-indexed.
	std::vector<bool> abRefList;
	abRefList.resize(pMesh->mNumVertices,false);
	for (unsigned int i = 0; i < pMesh->mNumFaces;++i)
	{
		aiFace& face = pMesh->mFaces[i];
		for (unsigned int a = 0; a < face.mNumIndices;++a)
		{
			if (face.mIndices[a] >= pMesh->mNumVertices)
			{
				this->ReportError("aiMesh::mFaces[%i]::mIndices[%i] is out of range",i,a);
			}
			// the MSB flag is temporarily used by the extra verbose
			// mode to tell us that the JoinVerticesProcess might have 
			// been executed already.
			if ( !(this->mScene->mFlags & AI_SCENE_FLAGS_NON_VERBOSE_FORMAT ) && abRefList[face.mIndices[a]])
			{
				ReportError("aiMesh::mVertices[%i] is referenced twice - second "
					"time by aiMesh::mFaces[%i]::mIndices[%i]",face.mIndices[a],i,a);
			}
			abRefList[face.mIndices[a]] = true;
		}
	}

	// check whether there are vertices that aren't referenced by a face
	bool b = false;
	for (unsigned int i = 0; i < pMesh->mNumVertices;++i)
	{
		if (!abRefList[i])b = true;
	}
	abRefList.clear();
	if (b)ReportWarning("There are unreferenced vertices");

	// texture channel 2 may not be set if channel 1 is zero ...
	{
		unsigned int i = 0;
		for (;i < AI_MAX_NUMBER_OF_TEXTURECOORDS;++i)
		{
			if (!pMesh->HasTextureCoords(i))break;
		}
		for (;i < AI_MAX_NUMBER_OF_TEXTURECOORDS;++i)
			if (pMesh->HasTextureCoords(i))
			{
				ReportError("Texture coordinate channel %i exists "
					"although the previous channel was NULL.",i);
			}
	}
	// the same for the vertex colors
	{
		unsigned int i = 0;
		for (;i < AI_MAX_NUMBER_OF_COLOR_SETS;++i)
		{
			if (!pMesh->HasVertexColors(i))break;
		}
		for (;i < AI_MAX_NUMBER_OF_COLOR_SETS;++i)
			if (pMesh->HasVertexColors(i))
			{
				ReportError("Vertex color channel %i is exists "
					"although the previous channel was NULL.",i);
			}
	}


	// now validate all bones
	if (pMesh->HasBones())
	{
		if (!pMesh->mBones)
		{
			ReportError("aiMesh::mBones is NULL (aiMesh::mNumBones is %i)",
				pMesh->mNumBones);
		}
		float* afSum = NULL;
		if (pMesh->mNumVertices)
		{
			afSum = new float[pMesh->mNumVertices];
			for (unsigned int i = 0; i < pMesh->mNumVertices;++i)
				afSum[i] = 0.0f;
		}

		// check whether there are duplicate bone names
		for (unsigned int i = 0; i < pMesh->mNumBones;++i)
		{
			if (!pMesh->mBones[i])
			{
				delete[] afSum;
				this->ReportError("aiMesh::mBones[%i] is NULL (aiMesh::mNumBones is %i)",
					i,pMesh->mNumBones);
			}
			Validate(pMesh,pMesh->mBones[i],afSum);

			for (unsigned int a = i+1; a < pMesh->mNumBones;++a)
			{
				if (pMesh->mBones[i]->mName == pMesh->mBones[a]->mName)
				{
					delete[] afSum;
					this->ReportError("aiMesh::mBones[%i] has the same name as "
						"aiMesh::mBones[%i]",i,a);
				}
			}
		}
		// check whether all bone weights for a vertex sum to 1.0 ...
		for (unsigned int i = 0; i < pMesh->mNumVertices;++i)
		{
			if (afSum[i] && (afSum[i] <= 0.995 || afSum[i] >= 1.005))
			{
				ReportWarning("aiMesh::mVertices[%i]: bone weight sum != 1.0 (sum is %f)",i,afSum[i]);
			}
		}
		delete[] afSum;
	}
}
// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::Validate( const aiMesh* pMesh,
	const aiBone* pBone,float* afSum)
{
	this->Validate(&pBone->mName);

   	if (!pBone->mNumWeights)
	{
		this->ReportError("aiBone::mNumWeights is zero");
	}

	// check whether all vertices affected by this bone are valid
	for (unsigned int i = 0; i < pBone->mNumWeights;++i)
	{
		if (pBone->mWeights[i].mVertexId > pMesh->mNumVertices)
		{
			this->ReportError("aiBone::mWeights[%i].mVertexId is out of range",i);
		}
		else if (!pBone->mWeights[i].mWeight || pBone->mWeights[i].mWeight > 1.0f)
		{
			this->ReportWarning("aiBone::mWeights[%i].mWeight has an invalid value",i);
		}
		afSum[pBone->mWeights[i].mVertexId] += pBone->mWeights[i].mWeight;
	}
}
// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::Validate( const aiAnimation* pAnimation)
{
	this->Validate(&pAnimation->mName);

	// validate all materials
	if (pAnimation->mNumChannels)
	{
		if (!pAnimation->mChannels)
		{
			this->ReportError("aiAnimation::mChannels is NULL (aiAnimation::mNumChannels is %i)",
				pAnimation->mNumChannels);
		}
		for (unsigned int i = 0; i < pAnimation->mNumChannels;++i)
		{
			if (!pAnimation->mChannels[i])
			{
				this->ReportError("aiAnimation::mChannels[%i] is NULL (aiAnimation::mNumChannels is %i)",
					i, pAnimation->mNumChannels);
			}
			this->Validate(pAnimation, pAnimation->mChannels[i]);
		}
	}
	else this->ReportError("aiAnimation::mNumChannels is 0. At least one node animation channel must be there.");

	// Animation duration is allowed to be zero in cases where the anim contains only a single key frame.
	// if (!pAnimation->mDuration)this->ReportError("aiAnimation::mDuration is zero");
}
// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::SearchForInvalidTextures(const aiMaterial* pMaterial,
	const char* szType)
{
	ai_assert(NULL != szType);

	// search all keys of the material ...
	// textures must be specified with rising indices (e.g. diffuse #2 may not be
	// specified if diffuse #1 is not there ...)

	// "$tex.file.<szType>[<index>]"
	char szBaseBuf[512];
	int iLen;
	iLen = ::sprintf(szBaseBuf,"$tex.file.%s",szType);
	if (0 >= iLen)return;

	int iNumIndices = 0;
	int iIndex = -1;
	for (unsigned int i = 0; i < pMaterial->mNumProperties;++i)
	{
		aiMaterialProperty* prop = pMaterial->mProperties[i];
		if (0 == ASSIMP_strincmp( prop->mKey.data, szBaseBuf, iLen ))
		{
			const char* sz = &prop->mKey.data[iLen];
			if (*sz)
			{
				++sz;
				iIndex = std::max(iIndex, (int)strtol10(sz,0));
				++iNumIndices;
			}

			if (aiPTI_String != prop->mType)
				this->ReportError("Material property %s is expected to be a string",prop->mKey.data);
		}
	}
	if (iIndex +1 != iNumIndices)
	{
		this->ReportError("%s #%i is set, but there are only %i %s textures",
			szType,iIndex,iNumIndices,szType);
	}
	if (!iNumIndices)return;

	// now check whether all UV indices are valid ...
	iLen = ::sprintf(szBaseBuf,"$tex.uvw.%s",szType);
	if (0 >= iLen)return;

	bool bNoSpecified = true;
	for (unsigned int i = 0; i < pMaterial->mNumProperties;++i)
	{
		aiMaterialProperty* prop = pMaterial->mProperties[i];
		if (0 == ASSIMP_strincmp( prop->mKey.data, szBaseBuf, iLen ))
		{
			if (aiPTI_Integer != prop->mType || sizeof(int) > prop->mDataLength)
				this->ReportError("Material property %s is expected to be an integer",prop->mKey.data);

			const char* sz = &prop->mKey.data[iLen];
			if (*sz)
			{
				++sz;
				iIndex = strtol10(sz,NULL);
				bNoSpecified = false;

				// ignore UV indices for texture channel that are not there ...
				if (iIndex >= iNumIndices)
				{
					// get the value
					iIndex = *((unsigned int*)prop->mData);

					// check whether there is a mesh using this material
					// which has not enough UV channels ...
					for (unsigned int a = 0; a < mScene->mNumMeshes;++a)
					{
						aiMesh* mesh = this->mScene->mMeshes[a];
						if(mesh->mMaterialIndex == (unsigned int)iIndex)
						{
							int iChannels = 0;
							while (mesh->HasTextureCoords(iChannels))++iChannels;
							if (iIndex >= iChannels)
							{
								this->ReportError("Invalid UV index: %i (key %s). Mesh %i has only %i UV channels",
									iIndex,prop->mKey.data,a,iChannels);
							}
						}
					}
				}
			}
		}
	}
	if (bNoSpecified)
	{
		// Assume that all textures are using the first UV channel
		for (unsigned int a = 0; a < mScene->mNumMeshes;++a)
		{
			aiMesh* mesh = this->mScene->mMeshes[a];
			if(mesh->mMaterialIndex == (unsigned int)iIndex)
			{
				if (!mesh->mTextureCoords[0])
				{
					// This is a special case ... it could be that the
					// original mesh format intended the use of a special
					// mapping here.
					ReportWarning("UV-mapped texture, but there are no UV coords");
				}
			}
		}
	}
}
// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::Validate( const aiMaterial* pMaterial)
{
	// check whether there are material keys that are obviously not legal
	for (unsigned int i = 0; i < pMaterial->mNumProperties;++i)
	{
		const aiMaterialProperty* prop = pMaterial->mProperties[i];
		if (!prop)
		{
			this->ReportError("aiMaterial::mProperties[%i] is NULL (aiMaterial::mNumProperties is %i)",
				i,pMaterial->mNumProperties);
		}
		if (!prop->mDataLength || !prop->mData)
		{
			this->ReportError("aiMaterial::mProperties[%i].mDataLength or "
				"aiMaterial::mProperties[%i].mData is 0",i,i);
		}
		// check all predefined types
		if (aiPTI_String == prop->mType)
		{
			// FIX: strings are now stored in a less expensive way ...
			if (prop->mDataLength < sizeof(size_t) + ((const aiString*)prop->mData)->length + 1)
			{
				this->ReportError("aiMaterial::mProperties[%i].mDataLength is "
					"too small to contain a string (%i, needed: %i)",
					i,prop->mDataLength,sizeof(aiString));
			}
			this->Validate((const aiString*)prop->mData);
		}
		else if (aiPTI_Float == prop->mType)
		{
			if (prop->mDataLength < sizeof(float))
			{
				this->ReportError("aiMaterial::mProperties[%i].mDataLength is "
					"too small to contain a float (%i, needed: %i)",
					i,prop->mDataLength,sizeof(float));
			}
		}
		else if (aiPTI_Integer == prop->mType)
		{
			if (prop->mDataLength < sizeof(int))
			{
				this->ReportError("aiMaterial::mProperties[%i].mDataLength is "
					"too small to contain an integer (%i, needed: %i)",
					i,prop->mDataLength,sizeof(int));
			}
		}
		// TODO: check whether there is a key with an unknown name ...
	}

	// make some more specific tests 
	float fTemp;
	int iShading;
	if (AI_SUCCESS == aiGetMaterialInteger( pMaterial,AI_MATKEY_SHADING_MODEL,&iShading))
	{
		switch ((aiShadingMode)iShading)
		{
		case aiShadingMode_Blinn:
		case aiShadingMode_CookTorrance:
		case aiShadingMode_Phong:

			if (AI_SUCCESS != aiGetMaterialFloat(pMaterial,AI_MATKEY_SHININESS,&fTemp))
			{
				this->ReportWarning("A specular shading model is specified but there is no "
					"AI_MATKEY_SHININESS key");
			}
			if (AI_SUCCESS == aiGetMaterialFloat(pMaterial,AI_MATKEY_SHININESS_STRENGTH,&fTemp) && !fTemp)
			{
				this->ReportWarning("A specular shading model is specified but the value of the "
					"AI_MATKEY_SHININESS_STRENGTH key is 0.0");
			}
			break;
		default: ;
		};
	}

	// check whether there are invalid texture keys
	SearchForInvalidTextures(pMaterial,"diffuse");
	SearchForInvalidTextures(pMaterial,"specular");
	SearchForInvalidTextures(pMaterial,"ambient");
	SearchForInvalidTextures(pMaterial,"emissive");
	SearchForInvalidTextures(pMaterial,"opacity");
	SearchForInvalidTextures(pMaterial,"shininess");
	SearchForInvalidTextures(pMaterial,"normals");
	SearchForInvalidTextures(pMaterial,"height");
}
// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::Validate( const aiTexture* pTexture)
{
	// the data section may NEVER be NULL
	if (!pTexture->pcData)
	{
		this->ReportError("aiTexture::pcData is NULL");
	}
	if (pTexture->mHeight)
	{
		if (!pTexture->mWidth)this->ReportError("aiTexture::mWidth is zero "
			"(aiTexture::mHeight is %i, uncompressed texture)",pTexture->mHeight);
	}
	else 
	{
		if (!pTexture->mWidth)this->ReportError("aiTexture::mWidth is zero (compressed texture)");
		if ('.' == pTexture->achFormatHint[0])
		{
			char szTemp[5];
			szTemp[0] = pTexture->achFormatHint[0];
			szTemp[1] = pTexture->achFormatHint[1];
			szTemp[2] = pTexture->achFormatHint[2];
			szTemp[3] = pTexture->achFormatHint[3];
			szTemp[4] = '\0';

			this->ReportWarning("aiTexture::achFormatHint should contain a file extension "
				"without a leading dot (format hint: %s).",szTemp);
		}
	}

	const char* sz = pTexture->achFormatHint;
 	if (	sz[0] >= 'A' && sz[0] <= 'Z' ||
		sz[1] >= 'A' && sz[1] <= 'Z' ||
		sz[2] >= 'A' && sz[2] <= 'Z' ||
		sz[3] >= 'A' && sz[3] <= 'Z')
	{
		this->ReportError("aiTexture::achFormatHint contains non-lowercase characters");
	}
}
// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::Validate( const aiAnimation* pAnimation,
	 const aiNodeAnim* pNodeAnim)
{
	this->Validate(&pNodeAnim->mNodeName);

#if 0
	// check whether there is a bone with this name ...
	unsigned int i = 0;
	for (; i < this->mScene->mNumMeshes;++i)
	{
		aiMesh* mesh = this->mScene->mMeshes[i];
		for (unsigned int a = 0; a < mesh->mNumBones;++a)
		{
			if (mesh->mBones[a]->mName == pNodeAnim->mBoneName)
				goto __break_out;
		}
	}
__break_out:
	if (i == this->mScene->mNumMeshes)
	{
		this->ReportWarning("aiNodeAnim::mBoneName is \"%s\". However, no bone with this name was found",
			pNodeAnim->mBoneName.data);
	}
	if (!pNodeAnim->mNumPositionKeys && !pNodeAnim->mNumRotationKeys && !pNodeAnim->mNumScalingKeys)
	{
		this->ReportWarning("A bone animation channel has no keys");
	}
#endif
	// otherwise check whether one of the keys exceeds the total duration of the animation
	if (pNodeAnim->mNumPositionKeys)
	{
		if (!pNodeAnim->mPositionKeys)
		{
			this->ReportError("aiNodeAnim::mPositionKeys is NULL (aiNodeAnim::mNumPositionKeys is %i)",
				pNodeAnim->mNumPositionKeys);
		}
		double dLast = -0.1;
		for (unsigned int i = 0; i < pNodeAnim->mNumPositionKeys;++i)
		{
			if (pNodeAnim->mPositionKeys[i].mTime > pAnimation->mDuration)
			{
				this->ReportError("aiNodeAnim::mPositionKeys[%i].mTime (%.5f) is larger "
					"than aiAnimation::mDuration (which is %.5f)",i,
					(float)pNodeAnim->mPositionKeys[i].mTime,
					(float)pAnimation->mDuration);
			}
			if (pNodeAnim->mPositionKeys[i].mTime <= dLast)
			{
				this->ReportWarning("aiNodeAnim::mPositionKeys[%i].mTime (%.5f) is smaller "
					"than aiAnimation::mPositionKeys[%i] (which is %.5f)",i,
					(float)pNodeAnim->mPositionKeys[i].mTime,
					i-1, (float)dLast);
			}
			dLast = pNodeAnim->mPositionKeys[i].mTime;
		}
	}
	// rotation keys
	if (pNodeAnim->mNumRotationKeys)
	{
		if (!pNodeAnim->mRotationKeys)
		{
			this->ReportError("aiNodeAnim::mRotationKeys is NULL (aiNodeAnim::mNumRotationKeys is %i)",
				pNodeAnim->mNumRotationKeys);
		}
		double dLast = -0.1;
		for (unsigned int i = 0; i < pNodeAnim->mNumRotationKeys;++i)
		{
			if (pNodeAnim->mRotationKeys[i].mTime > pAnimation->mDuration)
			{
				this->ReportError("aiNodeAnim::mRotationKeys[%i].mTime (%.5f) is larger "
					"than aiAnimation::mDuration (which is %.5f)",i,
					(float)pNodeAnim->mRotationKeys[i].mTime,
					(float)pAnimation->mDuration);
			}
			if (pNodeAnim->mRotationKeys[i].mTime <= dLast)
			{
				this->ReportWarning("aiNodeAnim::mRotationKeys[%i].mTime (%.5f) is smaller "
					"than aiAnimation::mRotationKeys[%i] (which is %.5f)",i,
					(float)pNodeAnim->mRotationKeys[i].mTime,
					i-1, (float)dLast);
			}
			dLast = pNodeAnim->mRotationKeys[i].mTime;
		}
	}
	// scaling keys
	if (pNodeAnim->mNumScalingKeys)
	{
		if (!pNodeAnim->mScalingKeys)
		{
			this->ReportError("aiNodeAnim::mScalingKeys is NULL (aiNodeAnim::mNumScalingKeys is %i)",
				pNodeAnim->mNumScalingKeys);
		}
		double dLast = -0.1;
		for (unsigned int i = 0; i < pNodeAnim->mNumScalingKeys;++i)
		{
			if (pNodeAnim->mScalingKeys[i].mTime > pAnimation->mDuration)
			{
				this->ReportError("aiNodeAnim::mScalingKeys[%i].mTime (%.5f) is larger "
					"than aiAnimation::mDuration (which is %.5f)",i,
					(float)pNodeAnim->mScalingKeys[i].mTime,
					(float)pAnimation->mDuration);
			}
			if (pNodeAnim->mScalingKeys[i].mTime <= dLast)
			{
				this->ReportWarning("aiNodeAnim::mScalingKeys[%i].mTime (%.5f) is smaller "
					"than aiAnimation::mScalingKeys[%i] (which is %.5f)",i,
					(float)pNodeAnim->mScalingKeys[i].mTime,
					i-1, (float)dLast);
			}
			dLast = pNodeAnim->mScalingKeys[i].mTime;
		}
	}
}
// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::Validate( const aiNode* pNode)
{
	if (!pNode)this->ReportError("A node of the scenegraph is NULL");
	if (pNode != this->mScene->mRootNode && !pNode->mParent)
		this->ReportError("A node has no valid parent (aiNode::mParent is NULL)");

	this->Validate(&pNode->mName);

	// validate all meshes
	if (pNode->mNumMeshes)
	{
		if (!pNode->mMeshes)
		{
			this->ReportError("aiNode::mMeshes is NULL (aiNode::mNumMeshes is %i)",
				pNode->mNumMeshes);
		}
		std::vector<bool> abHadMesh;
		abHadMesh.resize(this->mScene->mNumMeshes,false);
		for (unsigned int i = 0; i < pNode->mNumMeshes;++i)
		{
			if (pNode->mMeshes[i] >= this->mScene->mNumMeshes)
			{
				this->ReportError("aiNode::mMeshes[%i] is out of range (maximum is %i)",
					pNode->mMeshes[i],this->mScene->mNumMeshes-1);
			}
			if (abHadMesh[pNode->mMeshes[i]])
			{
				this->ReportError("aiNode::mMeshes[%i] is already referenced by this node (value: %i)",
					i,pNode->mMeshes[i]);
			}
			abHadMesh[pNode->mMeshes[i]] = true;
		}
	}
	if (pNode->mNumChildren)
	{
		if (!pNode->mChildren)
		{
			this->ReportError("aiNode::mChildren is NULL (aiNode::mNumChildren is %i)",
				pNode->mNumChildren);
		}
		for (unsigned int i = 0; i < pNode->mNumChildren;++i)
		{
			this->Validate(pNode->mChildren[i]);
		}
	}
}
// ------------------------------------------------------------------------------------------------
void ValidateDSProcess::Validate( const aiString* pString)
{
	if (pString->length > MAXLEN)
	{
		this->ReportError("aiString::length is too large (%i, maximum is %i)",
			pString->length,MAXLEN);
	}
	const char* sz = pString->data;
	while (true)
	{
		if ('\0' == *sz)
		{
			if (pString->length != (unsigned int)(sz-pString->data))
				this->ReportError("aiString::data is invalid: the terminal zero is at a wrong offset");
			break;
		}
		else if (sz >= &pString->data[MAXLEN])
			this->ReportError("aiString::data is invalid. There is no terminal character");
		++sz;
	}
}