assimp/code/MaterialSystem.cpp

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

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  following disclaimer.

* Redistributions in binary form must reproduce the above
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*/

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

#include <assimp/Hash.h>
#include <assimp/fast_atof.h>
#include <assimp/ParsingUtils.h>
#include "MaterialSystem.h"
#include <assimp/types.h>
#include <assimp/material.h>
#include <assimp/DefaultLogger.hpp>
#include <assimp/Macros.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 wild-card, 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,
    ai_real* 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, convert to ai_real
    unsigned int iWrite = 0;
    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<ai_real> ( reinterpret_cast<float*>(prop->mData)[a] );
        }
        if (pMax) {
            *pMax = iWrite;
        }
    }
    // data is given in doubles, convert to float
    else if( aiPTI_Double == prop->mType)  {
        iWrite = prop->mDataLength / sizeof(double);
        if (pMax) {
            iWrite = std::min(*pMax,iWrite); ;
        }
        for (unsigned int a = 0; a < iWrite;++a)    {
            pOut[a] = static_cast<ai_real> ( reinterpret_cast<double*>(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<ai_real> ( 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 );
        ai_assert( !prop->mData[ prop->mDataLength - 1 ] );
        for ( unsigned int a = 0; ;++a) {
            cur = fast_atoreal_move<ai_real>(cur,pOut[a]);
            if ( a==iWrite-1 ) {
                break;
            }
            if ( !IsSpace(*cur) ) {
                ASSIMP_LOG_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 = 0;
    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 );
        ai_assert( !prop->mData[ prop->mDataLength - 1 ] );
        for (unsigned int a = 0; ;++a) {
            pOut[a] = strtol10(cur,&cur);
            if(a==iWrite-1) {
                break;
            }
            if(!IsSpace(*cur)) {
                ASSIMP_LOG_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,(ai_real*)pOut,&iMax);

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

    return eRet;
}

// ------------------------------------------------------------------------------------------------
// Get a aiUVTransform (4 floats) from the material
aiReturn aiGetMaterialUVTransform(const aiMaterial* pMat,
    const char* pKey,
    unsigned int type,
    unsigned int index,
    aiUVTransform* pOut)
{
    unsigned int iMax = 4;
    return aiGetMaterialFloatArray(pMat,pKey,type,index,(ai_real*)pOut,&iMax);
}

// ------------------------------------------------------------------------------------------------
// 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 );
        ai_assert( !prop->mData[ prop->mDataLength - 1 ] );
        memcpy(pOut->data,prop->mData+4,pOut->length+1);
    }
    else {
        // TODO - implement lexical cast as well
        ASSIMP_LOG_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
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*/,
    ai_real* blend              /*= NULL*/,
    aiTextureOp* op             /*= NULL*/,
    aiTextureMapMode* mapmode   /*= NULL*/,
    unsigned int* flags         /*= NULL*/
    )
{
    ai_assert( NULL != mat );
    ai_assert( 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
    int mapping_ = static_cast<int>(aiTextureMapping_UV);
    aiGetMaterialInteger(mat,AI_MATKEY_MAPPING(type,index), &mapping_);
    aiTextureMapping mapping = static_cast<aiTextureMapping>(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;
}

static aiMaterial *DefaultMaterial = nullptr;

// ------------------------------------------------------------------------------------------------
// Will return the default material.
aiMaterial *aiCreateAndRegisterDefaultMaterial() {
    if (nullptr == DefaultMaterial) {
        DefaultMaterial = new aiMaterial;
        aiString s;
        s.Set(AI_DEFAULT_MATERIAL_NAME);
        DefaultMaterial->AddProperty(&s, AI_MATKEY_NAME);
    }

    return DefaultMaterial;
}

// ------------------------------------------------------------------------------------------------
// Will return the default material.
void aiReleaseDefaultMaterial() {
    DefaultMaterial = nullptr;
}

static const unsigned int DefaultNumAllocated = 5;

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

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

    delete[] mProperties;
}

// ------------------------------------------------------------------------------------------------
aiString aiMaterial::GetName() {
    aiString name;
    Get(AI_MATKEY_NAME, name);

    return name;
}

// ------------------------------------------------------------------------------------------------
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( nullptr != 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 );

    if ( 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&) {
            delete pcNew;
            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,
            static_cast<unsigned int>(pInput->length+1+4),
            pKey,
            type,
            index,
            aiPTI_String);
    }
    ai_assert(sizeof(size_t)==4);
    return AddBinaryProperty(pInput,
        static_cast<unsigned int>(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];
        }
    }

    if ( pcOld ) {
        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);
    }
}