assimp/code/MaterialSystem.cpp

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

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All rights reserved.

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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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*/

/** @file  MaterialSystem.cpp
 *  @brief Implementation of the material system of the library
 */

#include "AssimpPCH.h"

#include "Hash.h"
#include "fast_atof.h"
#include "ParsingUtils.h"
#include "MaterialSystem.h"

using namespace Assimp;

// ------------------------------------------------------------------------------------------------
// Get a specific property from a material
aiReturn aiGetMaterialProperty(const aiMaterial* pMat, 
	const char* pKey,
	unsigned int type,
    unsigned int index,
	const aiMaterialProperty** pPropOut)
{
	ai_assert (pMat != NULL);
	ai_assert (pKey != NULL);
	ai_assert (pPropOut != NULL);

	/*  Just search for a property with exactly this name ..
	 *  could be improved by hashing, but it's possibly 
	 *  no worth the effort (we're bound to C structures,
	 *  thus std::map or derivates are not applicable. */
	for (unsigned int i = 0; i < pMat->mNumProperties;++i) {
		aiMaterialProperty* prop = pMat->mProperties[i];

		if (prop /* just for safety ... */
			&& 0 == strcmp( prop->mKey.data, pKey ) 
			&& (UINT_MAX == type  || prop->mSemantic == type) /* UINT_MAX is a wildcard, but this is undocumented :-) */ 
			&& (UINT_MAX == index || prop->mIndex == index))
		{
			*pPropOut = pMat->mProperties[i];
			return AI_SUCCESS;
		}
	}
	*pPropOut = NULL;
	return AI_FAILURE;
}

// ------------------------------------------------------------------------------------------------
// Get an array of floating-point values from the material.
aiReturn aiGetMaterialFloatArray(const aiMaterial* pMat, 
	const char* pKey,
	unsigned int type,
    unsigned int index,
	float* pOut,
	unsigned int* pMax)
{
	ai_assert (pOut != NULL);
	ai_assert (pMat != NULL);

	const aiMaterialProperty* prop;
	aiGetMaterialProperty(pMat,pKey,type,index, (const aiMaterialProperty**) &prop);
	if (!prop) {
		return AI_FAILURE;
	}

	// data is given in floats, simply copy it
	unsigned int iWrite;
	if( aiPTI_Float == prop->mType || aiPTI_Buffer == prop->mType)	{
		iWrite = prop->mDataLength / sizeof(float);
		if (pMax) {
			iWrite = std::min(*pMax,iWrite); ;
		}
		for (unsigned int a = 0; a < iWrite;++a)	{
			pOut[a] = static_cast<float> ( reinterpret_cast<float*>(prop->mData)[a] );
		}
		if (pMax) {
			*pMax = iWrite;
		}
	}
	// data is given in ints, convert to float
	else if( aiPTI_Integer == prop->mType)	{
		iWrite = prop->mDataLength / sizeof(int32_t);
		if (pMax) {
			iWrite = std::min(*pMax,iWrite); ;
		}
		for (unsigned int a = 0; a < iWrite;++a)	{
			pOut[a] = static_cast<float> ( reinterpret_cast<int32_t*>(prop->mData)[a] );
		}
		if (pMax) {
			*pMax = iWrite;
		}
	}
	// a string ... read floats separated by spaces
	else {
		if (pMax) {
			iWrite = *pMax;
		}
		// strings are zero-terminated with a 32 bit length prefix, so this is safe
		const char* cur =  prop->mData+4;
		ai_assert(prop->mDataLength>=5 && !prop->mData[prop->mDataLength-1]);
		for (unsigned int a = 0; ;++a) {	
			cur = fast_atoreal_move<float>(cur,pOut[a]);
			if(a==iWrite-1) {
				break;
			}
			if(!IsSpace(*cur)) {
				DefaultLogger::get()->error("Material property" + std::string(pKey) + 
					" is a string; failed to parse a float array out of it.");
				return AI_FAILURE;
			}
		}

		if (pMax) {
			*pMax = iWrite;
		}
	}
	return AI_SUCCESS;

}

// ------------------------------------------------------------------------------------------------
// Get an array if integers from the material
aiReturn aiGetMaterialIntegerArray(const aiMaterial* pMat, 
	const char* pKey,
	unsigned int type,
    unsigned int index,
	int* pOut,
	unsigned int* pMax)
{
	ai_assert (pOut != NULL);
	ai_assert (pMat != NULL);

	const aiMaterialProperty* prop;
	aiGetMaterialProperty(pMat,pKey,type,index,(const aiMaterialProperty**) &prop);
	if (!prop) {
		return AI_FAILURE;
	}

	// data is given in ints, simply copy it
	unsigned int iWrite;
	if( aiPTI_Integer == prop->mType || aiPTI_Buffer == prop->mType)	{
		iWrite = prop->mDataLength / sizeof(int32_t);
		if (pMax) {
			iWrite = std::min(*pMax,iWrite); ;
		}
		for (unsigned int a = 0; a < iWrite;++a) {
			pOut[a] = static_cast<int>(reinterpret_cast<int32_t*>(prop->mData)[a]);
		}
		if (pMax) {
			*pMax = iWrite;
		}
	}
	// data is given in floats convert to int 
	else if( aiPTI_Float == prop->mType)	{
		iWrite = prop->mDataLength / sizeof(float);
		if (pMax) {
			iWrite = std::min(*pMax,iWrite); ;
		}
		for (unsigned int a = 0; a < iWrite;++a) {
			pOut[a] = static_cast<int>(reinterpret_cast<float*>(prop->mData)[a]);
		}
		if (pMax) {
			*pMax = iWrite;
		}
	}
	// it is a string ... no way to read something out of this
	else	{
		if (pMax) {
			iWrite = *pMax;
		}
		// strings are zero-terminated with a 32 bit length prefix, so this is safe
		const char* cur =  prop->mData+4;
		ai_assert(prop->mDataLength>=5 && !prop->mData[prop->mDataLength-1]);
		for (unsigned int a = 0; ;++a) {	
			pOut[a] = strtol10(cur,&cur);
			if(a==iWrite-1) {
				break;
			}
			if(!IsSpace(*cur)) {
				DefaultLogger::get()->error("Material property" + std::string(pKey) + 
					" is a string; failed to parse an integer array out of it.");
				return AI_FAILURE;
			}
		}

		if (pMax) {
			*pMax = iWrite;
		}
	}
	return AI_SUCCESS;
}

// ------------------------------------------------------------------------------------------------
// Get a color (3 or 4 floats) from the material
aiReturn aiGetMaterialColor(const aiMaterial* pMat, 
	const char* pKey,
	unsigned int type,
	unsigned int index,
	aiColor4D* pOut)
{
	unsigned int iMax = 4;
	const aiReturn eRet = aiGetMaterialFloatArray(pMat,pKey,type,index,(float*)pOut,&iMax);

	// if no alpha channel is defined: set it to 1.0
	if (3 == iMax) {
		pOut->a = 1.0f;
	}

	return eRet;
}

// ------------------------------------------------------------------------------------------------
// Get a string from the material
aiReturn aiGetMaterialString(const aiMaterial* pMat, 
	const char* pKey,
	unsigned int type,
	unsigned int index,
	aiString* pOut)
{
	ai_assert (pOut != NULL);

	const aiMaterialProperty* prop;
	aiGetMaterialProperty(pMat,pKey,type,index,(const aiMaterialProperty**)&prop);
	if (!prop) {
		return AI_FAILURE;
	}

	if( aiPTI_String == prop->mType) {
		ai_assert(prop->mDataLength>=5);

		// The string is stored as 32 but length prefix followed by zero-terminated UTF8 data
		pOut->length = static_cast<unsigned int>(*reinterpret_cast<uint32_t*>(prop->mData));

		ai_assert(pOut->length+1+4==prop->mDataLength && !prop->mData[prop->mDataLength-1]);
		memcpy(pOut->data,prop->mData+4,pOut->length+1);
	}
	else {
		// TODO - implement lexical cast as well
		DefaultLogger::get()->error("Material property" + std::string(pKey) + 
			" was found, but is no string" );	
		return AI_FAILURE;
	}
	return AI_SUCCESS;
}

// ------------------------------------------------------------------------------------------------
// Get the number of textures on a particular texture stack
ASSIMP_API unsigned int aiGetMaterialTextureCount(const C_STRUCT aiMaterial* pMat,  
	C_ENUM aiTextureType type)
{
	ai_assert (pMat != NULL);

	/* Textures are always stored with ascending indices (ValidateDS provides a check, so we don't need to do it again) */
	unsigned int max = 0;
	for (unsigned int i = 0; i < pMat->mNumProperties;++i) {
		aiMaterialProperty* prop = pMat->mProperties[i];

		if (prop /* just a sanity check ... */ 
			&& 0 == strcmp( prop->mKey.data, _AI_MATKEY_TEXTURE_BASE )
			&& prop->mSemantic == type) {
	
			max = std::max(max,prop->mIndex+1);
		}
	}
	return max;
}

// ------------------------------------------------------------------------------------------------
aiReturn aiGetMaterialTexture(const C_STRUCT aiMaterial* mat,
    aiTextureType type,
    unsigned int  index,
    C_STRUCT aiString* path,
	aiTextureMapping* _mapping	/*= NULL*/,
    unsigned int* uvindex		/*= NULL*/,
    float* blend				/*= NULL*/,
    aiTextureOp* op				/*= NULL*/,
	aiTextureMapMode* mapmode	/*= NULL*/,
	unsigned int* flags         /*= NULL*/
	)
{
	ai_assert(NULL != mat && NULL != path);

	// Get the path to the texture
	if (AI_SUCCESS != aiGetMaterialString(mat,AI_MATKEY_TEXTURE(type,index),path))	{
		return AI_FAILURE;
	}
	// Determine mapping type 
	aiTextureMapping mapping = aiTextureMapping_UV;
	aiGetMaterialInteger(mat,AI_MATKEY_MAPPING(type,index),(int*)&mapping);
	if (_mapping)
		*_mapping = mapping;

	// Get UV index 
	if (aiTextureMapping_UV == mapping && uvindex)	{
		aiGetMaterialInteger(mat,AI_MATKEY_UVWSRC(type,index),(int*)uvindex);
	}
	// Get blend factor 
	if (blend)	{
		aiGetMaterialFloat(mat,AI_MATKEY_TEXBLEND(type,index),blend);
	}
	// Get texture operation 
	if (op){
		aiGetMaterialInteger(mat,AI_MATKEY_TEXOP(type,index),(int*)op);
	}
	// Get texture mapping modes
	if (mapmode)	{
		aiGetMaterialInteger(mat,AI_MATKEY_MAPPINGMODE_U(type,index),(int*)&mapmode[0]);
		aiGetMaterialInteger(mat,AI_MATKEY_MAPPINGMODE_V(type,index),(int*)&mapmode[1]);		
	}
	// Get texture flags
	if (flags){
		aiGetMaterialInteger(mat,AI_MATKEY_TEXFLAGS(type,index),(int*)flags);
	}
	return AI_SUCCESS;
}

// ------------------------------------------------------------------------------------------------
// Construction. Actually the one and only way to get an aiMaterial instance
aiMaterial::aiMaterial()
{
	// Allocate 5 entries by default
	mNumProperties = 0;
	mNumAllocated = 5;
	mProperties = new aiMaterialProperty*[5];
}

// ------------------------------------------------------------------------------------------------
aiMaterial::~aiMaterial()
{
	Clear();

	delete[] mProperties;
}

// ------------------------------------------------------------------------------------------------
void aiMaterial::Clear()
{
	for (unsigned int i = 0; i < mNumProperties;++i)	{
		// delete this entry
		delete mProperties[i];
		AI_DEBUG_INVALIDATE_PTR(mProperties[i]);
	}
	mNumProperties = 0;

	// The array remains allocated, we just invalidated its contents
}

// ------------------------------------------------------------------------------------------------
aiReturn aiMaterial::RemoveProperty (const char* pKey,unsigned int type,
    unsigned int index
	)
{
	ai_assert(NULL != pKey);

	for (unsigned int i = 0; i < mNumProperties;++i) {
		aiMaterialProperty* prop = mProperties[i];

		if (prop && !strcmp( prop->mKey.data, pKey ) &&
			prop->mSemantic == type && prop->mIndex == index)
		{
			// Delete this entry
			delete mProperties[i];

			// collapse the array behind --.
			--mNumProperties;
			for (unsigned int a = i; a < mNumProperties;++a)	{
				mProperties[a] = mProperties[a+1];
			}
			return AI_SUCCESS;
		}
	}

	return AI_FAILURE;
}

// ------------------------------------------------------------------------------------------------
aiReturn aiMaterial::AddBinaryProperty (const void* pInput,
	unsigned int pSizeInBytes,
	const char* pKey,
	unsigned int type,
    unsigned int index,
	aiPropertyTypeInfo pType
	)
{
	ai_assert (pInput != NULL);
	ai_assert (pKey != NULL);
	ai_assert (0 != pSizeInBytes);

	// first search the list whether there is already an entry with this key
	unsigned int iOutIndex = UINT_MAX;
	for (unsigned int i = 0; i < mNumProperties;++i)	{
		aiMaterialProperty* prop = mProperties[i];

		if (prop /* just for safety */ && !strcmp( prop->mKey.data, pKey ) &&
			prop->mSemantic == type && prop->mIndex == index){

			delete mProperties[i];
			iOutIndex = i;
		}
	}

	// Allocate a new material property
	aiMaterialProperty* pcNew = new aiMaterialProperty();

	// .. and fill it
	pcNew->mType = pType;
	pcNew->mSemantic = type;
	pcNew->mIndex = index;

	pcNew->mDataLength = pSizeInBytes;
	pcNew->mData = new char[pSizeInBytes];
	memcpy (pcNew->mData,pInput,pSizeInBytes);

	pcNew->mKey.length = ::strlen(pKey);
	ai_assert ( MAXLEN > pcNew->mKey.length);
	strcpy( pcNew->mKey.data, pKey );

	if (UINT_MAX != iOutIndex)	{
		mProperties[iOutIndex] = pcNew;
		return AI_SUCCESS;
	}

	// resize the array ... double the storage allocated
	if (mNumProperties == mNumAllocated)	{
		const unsigned int iOld = mNumAllocated;
		mNumAllocated *= 2;

		aiMaterialProperty** ppTemp;
		try {
		ppTemp = new aiMaterialProperty*[mNumAllocated];
		} catch (std::bad_alloc&) {
			return AI_OUTOFMEMORY;
		}

		// just copy all items over; then replace the old array
		memcpy (ppTemp,mProperties,iOld * sizeof(void*));

		delete[] mProperties;
		mProperties = ppTemp;
	}
	// push back ...
	mProperties[mNumProperties++] = pcNew;
	return AI_SUCCESS;
}

// ------------------------------------------------------------------------------------------------
aiReturn aiMaterial::AddProperty (const aiString* pInput,
	const char* pKey,
	unsigned int type,
    unsigned int index)
{
	// We don't want to add the whole buffer .. write a 32 bit length
	// prefix followed by the zero-terminated UTF8 string.
	// (HACK) I don't want to break the ABI now, but we definitely
	// ought to change aiString::mLength to uint32_t one day.
	if (sizeof(size_t) == 8) {
		aiString copy = *pInput;
		uint32_t* s = reinterpret_cast<uint32_t*>(&copy.length);
		s[1] = static_cast<uint32_t>(pInput->length);

		return AddBinaryProperty(s+1,
			pInput->length+1+4,
			pKey,
			type,
			index, 
			aiPTI_String);
	}
	ai_assert(sizeof(size_t)==4);
	return AddBinaryProperty(pInput,
		pInput->length+1+4,
		pKey,
		type,
		index, 
		aiPTI_String);
}

// ------------------------------------------------------------------------------------------------
uint32_t Assimp :: ComputeMaterialHash(const aiMaterial* mat, bool includeMatName /*= false*/)
{
	uint32_t hash = 1503; // magic start value, chosen to be my birthday :-)
	for (unsigned int i = 0; i < mat->mNumProperties;++i)	{
		aiMaterialProperty* prop;

		// Exclude all properties whose first character is '?' from the hash
		// See doc for aiMaterialProperty.
		if ((prop = mat->mProperties[i]) && (includeMatName || prop->mKey.data[0] != '?'))	{

			hash = SuperFastHash(prop->mKey.data,(unsigned int)prop->mKey.length,hash);
			hash = SuperFastHash(prop->mData,prop->mDataLength,hash);

			// Combine the semantic and the index with the hash
			hash = SuperFastHash((const char*)&prop->mSemantic,sizeof(unsigned int),hash);
			hash = SuperFastHash((const char*)&prop->mIndex,sizeof(unsigned int),hash);
		}
	}
	return hash;
}

// ------------------------------------------------------------------------------------------------
void aiMaterial::CopyPropertyList(aiMaterial* pcDest, 
	const aiMaterial* pcSrc
	)
{
	ai_assert(NULL != pcDest);
	ai_assert(NULL != pcSrc);

	unsigned int iOldNum = pcDest->mNumProperties;
	pcDest->mNumAllocated += pcSrc->mNumAllocated;
	pcDest->mNumProperties += pcSrc->mNumProperties;

	aiMaterialProperty** pcOld = pcDest->mProperties;
	pcDest->mProperties = new aiMaterialProperty*[pcDest->mNumAllocated];

	if (iOldNum && pcOld)	{
		for (unsigned int i = 0; i < iOldNum;++i) {
			pcDest->mProperties[i] = pcOld[i];
		}

		delete[] pcOld;
	}
	for (unsigned int i = iOldNum; i< pcDest->mNumProperties;++i)	{
		aiMaterialProperty* propSrc = pcSrc->mProperties[i];

		// search whether we have already a property with this name -> if yes, overwrite it
		aiMaterialProperty* prop;
		for (unsigned int q = 0; q < iOldNum;++q) {
			prop = pcDest->mProperties[q];
			if (prop /* just for safety */ && prop->mKey == propSrc->mKey && prop->mSemantic == propSrc->mSemantic
				&& prop->mIndex == propSrc->mIndex)	{
				delete prop;

				// collapse the whole array ...
				memmove(&pcDest->mProperties[q],&pcDest->mProperties[q+1],i-q);
				i--;
				pcDest->mNumProperties--;
			}
		}

		// Allocate the output property and copy the source property
		prop = pcDest->mProperties[i] = new aiMaterialProperty();
		prop->mKey = propSrc->mKey;
		prop->mDataLength = propSrc->mDataLength;
		prop->mType = propSrc->mType;
		prop->mSemantic = propSrc->mSemantic;
		prop->mIndex = propSrc->mIndex;

		prop->mData = new char[propSrc->mDataLength];
		memcpy(prop->mData,propSrc->mData,prop->mDataLength);
	}
	return;
}