Torque3D/Engine/lib/assimp/code/Obj/ObjFileMtlImporter.cpp

/*
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Open Asset Import Library (assimp)
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Copyright (c) 2006-2020, assimp 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
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/


#ifndef ASSIMP_BUILD_NO_OBJ_IMPORTER

#include <stdlib.h>
#include "ObjFileMtlImporter.h"
#include "ObjTools.h"
#include "ObjFileData.h"
#include <assimp/fast_atof.h>
#include <assimp/ParsingUtils.h>
#include <assimp/material.h>
#include <assimp/DefaultLogger.hpp>

namespace Assimp    {

// Material specific token (case insensitive compare)
static const std::string DiffuseTexture       = "map_Kd";
static const std::string AmbientTexture       = "map_Ka";
static const std::string SpecularTexture      = "map_Ks";
static const std::string OpacityTexture       = "map_d";
static const std::string EmissiveTexture1     = "map_emissive";
static const std::string EmissiveTexture2     = "map_Ke";
static const std::string BumpTexture1         = "map_bump";
static const std::string BumpTexture2         = "bump";
static const std::string NormalTexture        = "map_Kn";
static const std::string ReflectionTexture    = "refl";
static const std::string DisplacementTexture1 = "map_disp";
static const std::string DisplacementTexture2 = "disp";
static const std::string SpecularityTexture   = "map_ns";

// texture option specific token
static const std::string BlendUOption       = "-blendu";
static const std::string BlendVOption       = "-blendv";
static const std::string BoostOption        = "-boost";
static const std::string ModifyMapOption    = "-mm";
static const std::string OffsetOption       = "-o";
static const std::string ScaleOption        = "-s";
static const std::string TurbulenceOption   = "-t";
static const std::string ResolutionOption   = "-texres";
static const std::string ClampOption        = "-clamp";
static const std::string BumpOption         = "-bm";
static const std::string ChannelOption      = "-imfchan";
static const std::string TypeOption         = "-type";

// -------------------------------------------------------------------
//  Constructor
ObjFileMtlImporter::ObjFileMtlImporter( std::vector<char> &buffer,
                                       const std::string &,
                                       ObjFile::Model *pModel ) :
    m_DataIt( buffer.begin() ),
    m_DataItEnd( buffer.end() ),
    m_pModel( pModel ),
    m_uiLine( 0 )
{
    ai_assert( NULL != m_pModel );
    if ( NULL == m_pModel->m_pDefaultMaterial )
    {
        m_pModel->m_pDefaultMaterial = new ObjFile::Material;
        m_pModel->m_pDefaultMaterial->MaterialName.Set( "default" );
    }
    load();
}

// -------------------------------------------------------------------
//  Destructor
ObjFileMtlImporter::~ObjFileMtlImporter()
{
    // empty
}

// -------------------------------------------------------------------
//  Private copy constructor
ObjFileMtlImporter::ObjFileMtlImporter(const ObjFileMtlImporter & )
{
    // empty
}

// -------------------------------------------------------------------
//  Private copy constructor
ObjFileMtlImporter &ObjFileMtlImporter::operator = ( const ObjFileMtlImporter & )
{
    return *this;
}

// -------------------------------------------------------------------
//  Loads the material description
void ObjFileMtlImporter::load()
{
    if ( m_DataIt == m_DataItEnd )
        return;

    while ( m_DataIt != m_DataItEnd )
    {
        switch (*m_DataIt)
        {
        case 'k':
        case 'K':
            {
                ++m_DataIt;
                if (*m_DataIt == 'a') // Ambient color
                {
                    ++m_DataIt;
                    getColorRGBA( &m_pModel->m_pCurrentMaterial->ambient );
                }
                else if (*m_DataIt == 'd')  // Diffuse color
                {
                    ++m_DataIt;
                    getColorRGBA( &m_pModel->m_pCurrentMaterial->diffuse );
                }
                else if (*m_DataIt == 's')
                {
                    ++m_DataIt;
                    getColorRGBA( &m_pModel->m_pCurrentMaterial->specular );
                }
                else if (*m_DataIt == 'e')
                {
                    ++m_DataIt;
                    getColorRGBA( &m_pModel->m_pCurrentMaterial->emissive );
                }
                m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
            }
            break;
        case 'T':
            {
                ++m_DataIt;
                if (*m_DataIt == 'f') // Material transmission
                {
                    ++m_DataIt;
                    getColorRGBA( &m_pModel->m_pCurrentMaterial->transparent);
                }
                m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
            }
            break;
        case 'd':
            {
                if( *(m_DataIt+1) == 'i' && *( m_DataIt + 2 ) == 's' && *( m_DataIt + 3 ) == 'p' ) {
                    // A displacement map
                    getTexture();
                } else {
                    // Alpha value
                    ++m_DataIt;
                    getFloatValue( m_pModel->m_pCurrentMaterial->alpha );
                    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
                }
            }
            break;

        case 'N':
        case 'n':
            {
                ++m_DataIt;
                switch(*m_DataIt)
                {
                case 's':   // Specular exponent
                    ++m_DataIt;
                    getFloatValue(m_pModel->m_pCurrentMaterial->shineness);
                    break;
                case 'i':   // Index Of refraction
                    ++m_DataIt;
                    getFloatValue(m_pModel->m_pCurrentMaterial->ior);
                    break;
                case 'e':   // New material
                    createMaterial();
                    break;
                }
                m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
            }
            break;

        case 'm':   // Texture
        case 'b':   // quick'n'dirty - for 'bump' sections
        case 'r':   // quick'n'dirty - for 'refl' sections
            {
                getTexture();
                m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
            }
            break;

        case 'i':   // Illumination model
            {
                m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
                getIlluminationModel( m_pModel->m_pCurrentMaterial->illumination_model );
                m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
            }
            break;

        default:
            {
                m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
            }
            break;
        }
    }
}

// -------------------------------------------------------------------
//  Loads a color definition
void ObjFileMtlImporter::getColorRGBA( aiColor3D *pColor )
{
    ai_assert( NULL != pColor );

    ai_real r( 0.0 ), g( 0.0 ), b( 0.0 );
    m_DataIt = getFloat<DataArrayIt>( m_DataIt, m_DataItEnd, r );
    pColor->r = r;

    // we have to check if color is default 0 with only one token
    if( !IsLineEnd( *m_DataIt ) ) {
        m_DataIt = getFloat<DataArrayIt>( m_DataIt, m_DataItEnd, g );
        m_DataIt = getFloat<DataArrayIt>( m_DataIt, m_DataItEnd, b );
    }
    pColor->g = g;
    pColor->b = b;
}

// -------------------------------------------------------------------
//  Loads the kind of illumination model.
void ObjFileMtlImporter::getIlluminationModel( int &illum_model )
{
    m_DataIt = CopyNextWord<DataArrayIt>( m_DataIt, m_DataItEnd, m_buffer, BUFFERSIZE );
    illum_model = atoi(m_buffer);
}

// -------------------------------------------------------------------
//  Loads a single float value.
void ObjFileMtlImporter::getFloatValue( ai_real &value )
{
    m_DataIt = CopyNextWord<DataArrayIt>( m_DataIt, m_DataItEnd, m_buffer, BUFFERSIZE );
    value = (ai_real) fast_atof(m_buffer);
}

// -------------------------------------------------------------------
//  Creates a material from loaded data.
void ObjFileMtlImporter::createMaterial()
{
    std::string line;
    while( !IsLineEnd( *m_DataIt ) ) {
        line += *m_DataIt;
        ++m_DataIt;
    }

    std::vector<std::string> token;
    const unsigned int numToken = tokenize<std::string>( line, token, " \t" );
    std::string name;
    if ( numToken == 1 ) {
        name = AI_DEFAULT_MATERIAL_NAME;
    } else {
        // skip newmtl and all following white spaces
        std::size_t first_ws_pos = line.find_first_of(" \t");
        std::size_t first_non_ws_pos = line.find_first_not_of(" \t", first_ws_pos);
        if (first_non_ws_pos != std::string::npos) {
            name = line.substr(first_non_ws_pos);
        }
    }

    name = trim_whitespaces(name);

    std::map<std::string, ObjFile::Material*>::iterator it = m_pModel->m_MaterialMap.find( name );
    if ( m_pModel->m_MaterialMap.end() == it) {
        // New Material created
        m_pModel->m_pCurrentMaterial = new ObjFile::Material();
        m_pModel->m_pCurrentMaterial->MaterialName.Set( name );
        m_pModel->m_MaterialLib.push_back( name );
        m_pModel->m_MaterialMap[ name ] = m_pModel->m_pCurrentMaterial;

        if (m_pModel->m_pCurrentMesh) {
            m_pModel->m_pCurrentMesh->m_uiMaterialIndex = static_cast<unsigned int>(m_pModel->m_MaterialLib.size() - 1);
        }
    } else {
        // Use older material
        m_pModel->m_pCurrentMaterial = (*it).second;
    }
}

// -------------------------------------------------------------------
//  Gets a texture name from data.
void ObjFileMtlImporter::getTexture() {
    aiString *out( NULL );
    int clampIndex = -1;

    const char *pPtr( &(*m_DataIt) );
    if ( !ASSIMP_strincmp( pPtr, DiffuseTexture.c_str(), static_cast<unsigned int>(DiffuseTexture.size()) ) ) {
        // Diffuse texture
        out = & m_pModel->m_pCurrentMaterial->texture;
        clampIndex = ObjFile::Material::TextureDiffuseType;
    } else if ( !ASSIMP_strincmp( pPtr,AmbientTexture.c_str(), static_cast<unsigned int>(AmbientTexture.size()) ) ) {
        // Ambient texture
        out = & m_pModel->m_pCurrentMaterial->textureAmbient;
        clampIndex = ObjFile::Material::TextureAmbientType;
    } else if ( !ASSIMP_strincmp( pPtr, SpecularTexture.c_str(), static_cast<unsigned int>(SpecularTexture.size()) ) ) {
        // Specular texture
        out = & m_pModel->m_pCurrentMaterial->textureSpecular;
        clampIndex = ObjFile::Material::TextureSpecularType;
    } else if ( !ASSIMP_strincmp( pPtr, DisplacementTexture1.c_str(), static_cast<unsigned int>(DisplacementTexture1.size()) ) ||
                !ASSIMP_strincmp( pPtr, DisplacementTexture2.c_str(), static_cast<unsigned int>(DisplacementTexture2.size()) ) ) {
        // Displacement texture
        out = &m_pModel->m_pCurrentMaterial->textureDisp;
        clampIndex = ObjFile::Material::TextureDispType;
    } else if ( !ASSIMP_strincmp( pPtr, OpacityTexture.c_str(), static_cast<unsigned int>(OpacityTexture.size()) ) ) {
        // Opacity texture
        out = & m_pModel->m_pCurrentMaterial->textureOpacity;
        clampIndex = ObjFile::Material::TextureOpacityType;
    } else if ( !ASSIMP_strincmp( pPtr, EmissiveTexture1.c_str(), static_cast<unsigned int>(EmissiveTexture1.size()) ) ||
                !ASSIMP_strincmp( pPtr, EmissiveTexture2.c_str(), static_cast<unsigned int>(EmissiveTexture2.size()) ) ) {
        // Emissive texture
        out = & m_pModel->m_pCurrentMaterial->textureEmissive;
        clampIndex = ObjFile::Material::TextureEmissiveType;
    } else if ( !ASSIMP_strincmp( pPtr, BumpTexture1.c_str(), static_cast<unsigned int>(BumpTexture1.size()) ) ||
                !ASSIMP_strincmp( pPtr, BumpTexture2.c_str(), static_cast<unsigned int>(BumpTexture2.size()) ) ) {
        // Bump texture
        out = & m_pModel->m_pCurrentMaterial->textureBump;
        clampIndex = ObjFile::Material::TextureBumpType;
    } else if ( !ASSIMP_strincmp( pPtr,NormalTexture.c_str(), static_cast<unsigned int>(NormalTexture.size()) ) ) {
        // Normal map
        out = & m_pModel->m_pCurrentMaterial->textureNormal;
        clampIndex = ObjFile::Material::TextureNormalType;
    } else if( !ASSIMP_strincmp( pPtr, ReflectionTexture.c_str(), static_cast<unsigned int>(ReflectionTexture.size()) ) ) {
        // Reflection texture(s)
        //Do nothing here
        return;
    } else if ( !ASSIMP_strincmp( pPtr, SpecularityTexture.c_str(), static_cast<unsigned int>(SpecularityTexture.size()) ) ) {
        // Specularity scaling (glossiness)
        out = & m_pModel->m_pCurrentMaterial->textureSpecularity;
        clampIndex = ObjFile::Material::TextureSpecularityType;
    } else {
        ASSIMP_LOG_ERROR("OBJ/MTL: Encountered unknown texture type");
        return;
    }

    bool clamp = false;
    getTextureOption(clamp, clampIndex, out);
    m_pModel->m_pCurrentMaterial->clamp[clampIndex] = clamp;

    std::string texture;
    m_DataIt = getName<DataArrayIt>( m_DataIt, m_DataItEnd, texture );
    if ( NULL!=out ) {
        out->Set( texture );
    }
}

/* /////////////////////////////////////////////////////////////////////////////
 * Texture Option
 * /////////////////////////////////////////////////////////////////////////////
 * According to http://en.wikipedia.org/wiki/Wavefront_.obj_file#Texture_options
 * Texture map statement can contains various texture option, for example:
 *
 *  map_Ka -o 1 1 1 some.png
 *  map_Kd -clamp on some.png
 *
 * So we need to parse and skip these options, and leave the last part which is
 * the url of image, otherwise we will get a wrong url like "-clamp on some.png".
 *
 * Because aiMaterial supports clamp option, so we also want to return it
 * /////////////////////////////////////////////////////////////////////////////
 */
void ObjFileMtlImporter::getTextureOption(bool &clamp, int &clampIndex, aiString *&out) {
    m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);

    // If there is any more texture option
    while (!isEndOfBuffer(m_DataIt, m_DataItEnd) && *m_DataIt == '-')
    {
        const char *pPtr( &(*m_DataIt) );
        //skip option key and value
        int skipToken = 1;

        if (!ASSIMP_strincmp(pPtr, ClampOption.c_str(), static_cast<unsigned int>(ClampOption.size())))
        {
            DataArrayIt it = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
            char value[3];
            CopyNextWord(it, m_DataItEnd, value, sizeof(value) / sizeof(*value));
            if (!ASSIMP_strincmp(value, "on", 2))
            {
                clamp = true;
            }

            skipToken = 2;
        }
        else if( !ASSIMP_strincmp( pPtr, TypeOption.c_str(), static_cast<unsigned int>(TypeOption.size()) ) )
        {
            DataArrayIt it = getNextToken<DataArrayIt>( m_DataIt, m_DataItEnd );
            char value[ 12 ];
            CopyNextWord( it, m_DataItEnd, value, sizeof( value ) / sizeof( *value ) );
            if( !ASSIMP_strincmp( value, "cube_top", 8 ) )
            {
                clampIndex = ObjFile::Material::TextureReflectionCubeTopType;
                out = &m_pModel->m_pCurrentMaterial->textureReflection[0];
            }
            else if( !ASSIMP_strincmp( value, "cube_bottom", 11 ) )
            {
                clampIndex = ObjFile::Material::TextureReflectionCubeBottomType;
                out = &m_pModel->m_pCurrentMaterial->textureReflection[1];
            }
            else if( !ASSIMP_strincmp( value, "cube_front", 10 ) )
            {
                clampIndex = ObjFile::Material::TextureReflectionCubeFrontType;
                out = &m_pModel->m_pCurrentMaterial->textureReflection[2];
            }
            else if( !ASSIMP_strincmp( value, "cube_back", 9 ) )
            {
                clampIndex = ObjFile::Material::TextureReflectionCubeBackType;
                out = &m_pModel->m_pCurrentMaterial->textureReflection[3];
            }
            else if( !ASSIMP_strincmp( value, "cube_left", 9 ) )
            {
                clampIndex = ObjFile::Material::TextureReflectionCubeLeftType;
                out = &m_pModel->m_pCurrentMaterial->textureReflection[4];
            }
            else if( !ASSIMP_strincmp( value, "cube_right", 10 ) )
            {
                clampIndex = ObjFile::Material::TextureReflectionCubeRightType;
                out = &m_pModel->m_pCurrentMaterial->textureReflection[5];
            }
            else if( !ASSIMP_strincmp( value, "sphere", 6 ) )
            {
                clampIndex = ObjFile::Material::TextureReflectionSphereType;
                out = &m_pModel->m_pCurrentMaterial->textureReflection[0];
            }

            skipToken = 2;
        }
        else if (!ASSIMP_strincmp(pPtr, BlendUOption.c_str(), static_cast<unsigned int>(BlendUOption.size()))
                || !ASSIMP_strincmp(pPtr, BlendVOption.c_str(), static_cast<unsigned int>(BlendVOption.size()))
                || !ASSIMP_strincmp(pPtr, BoostOption.c_str(), static_cast<unsigned int>(BoostOption.size()))
                || !ASSIMP_strincmp(pPtr, ResolutionOption.c_str(), static_cast<unsigned int>(ResolutionOption.size()))
                || !ASSIMP_strincmp(pPtr, BumpOption.c_str(), static_cast<unsigned int>(BumpOption.size()))
                || !ASSIMP_strincmp(pPtr, ChannelOption.c_str(), static_cast<unsigned int>(ChannelOption.size())))
        {
            skipToken = 2;
        }
        else if (!ASSIMP_strincmp(pPtr, ModifyMapOption.c_str(), static_cast<unsigned int>(ModifyMapOption.size())))
        {
            skipToken = 3;
        }
        else if (  !ASSIMP_strincmp(pPtr, OffsetOption.c_str(), static_cast<unsigned int>(OffsetOption.size()))
                || !ASSIMP_strincmp(pPtr, ScaleOption.c_str(), static_cast<unsigned int>(ScaleOption.size()))
                || !ASSIMP_strincmp(pPtr, TurbulenceOption.c_str(), static_cast<unsigned int>(TurbulenceOption.size()))
                )
        {
            skipToken = 4;
        }

        for (int i = 0; i < skipToken; ++i)
        {
            m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
        }
    }
}

// -------------------------------------------------------------------

} // Namespace Assimp

#endif // !! ASSIMP_BUILD_NO_OBJ_IMPORTER