AtomicGameEngine/Source/ThirdParty/Assimp/code/MDLMaterialLoader.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
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  following disclaimer.

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*/

/** @file Implementation of the material part of the MDL importer class */


#ifndef ASSIMP_BUILD_NO_MDL_IMPORTER

// internal headers
#include "MDLLoader.h"
#include "MDLDefaultColorMap.h"
#include "../include/assimp/texture.h"
#include "../include/assimp/IOSystem.hpp"
#include "../include/assimp/DefaultLogger.hpp"
#include "../include/assimp/scene.h"
#include "qnan.h"
#include "Defines.h"


using namespace Assimp;
static aiTexel* const bad_texel = reinterpret_cast<aiTexel*>(SIZE_MAX);

// ------------------------------------------------------------------------------------------------
// Find a suitable pallette file or take teh default one
void MDLImporter::SearchPalette(const unsigned char** pszColorMap)
{
    // now try to find the color map in the current directory
    IOStream* pcStream = pIOHandler->Open(configPalette,"rb");

    const unsigned char* szColorMap = (const unsigned char*)::g_aclrDefaultColorMap;
    if(pcStream)
    {
        if (pcStream->FileSize() >= 768)
        {
            unsigned char* colorMap = new unsigned char[256*3];
            szColorMap = colorMap;
            pcStream->Read(colorMap,256*3,1);
            DefaultLogger::get()->info("Found valid colormap.lmp in directory. "
                "It will be used to decode embedded textures in palletized formats.");
        }
        delete pcStream;
        pcStream = NULL;
    }
    *pszColorMap = szColorMap;
}

// ------------------------------------------------------------------------------------------------
// Free the palette again
void MDLImporter::FreePalette(const unsigned char* szColorMap)
{
    if (szColorMap != (const unsigned char*)::g_aclrDefaultColorMap)
        delete[] szColorMap;
}

// ------------------------------------------------------------------------------------------------
// Check whether we can replace a texture with a single color
aiColor4D MDLImporter::ReplaceTextureWithColor(const aiTexture* pcTexture)
{
    ai_assert(NULL != pcTexture);

    aiColor4D clrOut;
    clrOut.r = get_qnan();
    if (!pcTexture->mHeight || !pcTexture->mWidth)
        return clrOut;

    const unsigned int iNumPixels = pcTexture->mHeight*pcTexture->mWidth;
    const aiTexel* pcTexel = pcTexture->pcData+1;
    const aiTexel* const pcTexelEnd = &pcTexture->pcData[iNumPixels];

    while (pcTexel != pcTexelEnd)
    {
        if (*pcTexel != *(pcTexel-1))
        {
            pcTexel = NULL;
            break;
        }
        ++pcTexel;
    }
    if (pcTexel)
    {
        clrOut.r = pcTexture->pcData->r / 255.0f;
        clrOut.g = pcTexture->pcData->g / 255.0f;
        clrOut.b = pcTexture->pcData->b / 255.0f;
        clrOut.a = pcTexture->pcData->a / 255.0f;
    }
    return clrOut;
}

// ------------------------------------------------------------------------------------------------
// Read a texture from a MDL3 file
void MDLImporter::CreateTextureARGB8_3DGS_MDL3(const unsigned char* szData)
{
    const MDL::Header *pcHeader = (const MDL::Header*)mBuffer;  //the endianess is allready corrected in the InternReadFile_3DGS_MDL345 function

    VALIDATE_FILE_SIZE(szData + pcHeader->skinwidth *
        pcHeader->skinheight);

    // allocate a new texture object
    aiTexture* pcNew = new aiTexture();
    pcNew->mWidth = pcHeader->skinwidth;
    pcNew->mHeight = pcHeader->skinheight;

    pcNew->pcData = new aiTexel[pcNew->mWidth * pcNew->mHeight];

    const unsigned char* szColorMap;
    this->SearchPalette(&szColorMap);

    // copy texture data
    for (unsigned int i = 0; i < pcNew->mWidth*pcNew->mHeight;++i)
    {
        const unsigned char val = szData[i];
        const unsigned char* sz = &szColorMap[val*3];

        pcNew->pcData[i].a = 0xFF;
        pcNew->pcData[i].r = *sz++;
        pcNew->pcData[i].g = *sz++;
        pcNew->pcData[i].b = *sz;
    }

    FreePalette(szColorMap);

    // store the texture
    aiTexture** pc = this->pScene->mTextures;
    this->pScene->mTextures = new aiTexture*[pScene->mNumTextures+1];
    for (unsigned int i = 0; i <pScene->mNumTextures;++i)
        pScene->mTextures[i] = pc[i];

    pScene->mTextures[this->pScene->mNumTextures] = pcNew;
    pScene->mNumTextures++;
    delete[] pc;
    return;
}

// ------------------------------------------------------------------------------------------------
// Read a texture from a MDL4 file
void MDLImporter::CreateTexture_3DGS_MDL4(const unsigned char* szData,
    unsigned int iType,
     unsigned int* piSkip)
{
    ai_assert(NULL != piSkip);

    const MDL::Header *pcHeader = (const MDL::Header*)mBuffer;  //the endianess is allready corrected in the InternReadFile_3DGS_MDL345 function

    if (iType == 1 || iType > 3)
    {
        DefaultLogger::get()->error("Unsupported texture file format");
        return;
    }

    const bool bNoRead = *piSkip == UINT_MAX;

    // allocate a new texture object
    aiTexture* pcNew = new aiTexture();
    pcNew->mWidth = pcHeader->skinwidth;
    pcNew->mHeight = pcHeader->skinheight;

    if (bNoRead)pcNew->pcData = bad_texel;
    ParseTextureColorData(szData,iType,piSkip,pcNew);

    // store the texture
    if (!bNoRead)
    {
        if (!this->pScene->mNumTextures)
        {
            pScene->mNumTextures = 1;
            pScene->mTextures = new aiTexture*[1];
            pScene->mTextures[0] = pcNew;
        }
        else
        {
            aiTexture** pc = pScene->mTextures;
            pScene->mTextures = new aiTexture*[pScene->mNumTextures+1];
            for (unsigned int i = 0; i < this->pScene->mNumTextures;++i)
                pScene->mTextures[i] = pc[i];
            pScene->mTextures[pScene->mNumTextures] = pcNew;
            pScene->mNumTextures++;
            delete[] pc;
        }
    }
    else {
        pcNew->pcData = NULL;
        delete pcNew;
    }
    return;
}

// ------------------------------------------------------------------------------------------------
// Load color data of a texture and convert it to our output format
void MDLImporter::ParseTextureColorData(const unsigned char* szData,
    unsigned int iType,
    unsigned int* piSkip,
    aiTexture* pcNew)
{
    const bool do_read = bad_texel != pcNew->pcData;

    // allocate storage for the texture image
    if (do_read) {
        pcNew->pcData = new aiTexel[pcNew->mWidth * pcNew->mHeight];
    }

    // R5G6B5 format (with or without MIPs)
    // ****************************************************************
    if (2 == iType || 10 == iType)
    {
        VALIDATE_FILE_SIZE(szData + pcNew->mWidth*pcNew->mHeight*2);

        // copy texture data
        unsigned int i;
        if (do_read)
        {
            for (i = 0; i < pcNew->mWidth*pcNew->mHeight;++i)
            {
                MDL::RGB565 val = ((MDL::RGB565*)szData)[i];
                AI_SWAP2(val);

                pcNew->pcData[i].a = 0xFF;
                pcNew->pcData[i].r = (unsigned char)val.b << 3;
                pcNew->pcData[i].g = (unsigned char)val.g << 2;
                pcNew->pcData[i].b = (unsigned char)val.r << 3;
            }
        }
        else i = pcNew->mWidth*pcNew->mHeight;
        *piSkip = i * 2;

        // apply MIP maps
        if (10 == iType)
        {
            *piSkip += ((i >> 2) + (i >> 4) + (i >> 6)) << 1;
            VALIDATE_FILE_SIZE(szData + *piSkip);
        }
    }
    // ARGB4 format (with or without MIPs)
    // ****************************************************************
    else if (3 == iType || 11 == iType)
    {
        VALIDATE_FILE_SIZE(szData + pcNew->mWidth*pcNew->mHeight*4);

        // copy texture data
        unsigned int i;
        if (do_read)
        {
            for (i = 0; i < pcNew->mWidth*pcNew->mHeight;++i)
            {
                MDL::ARGB4 val = ((MDL::ARGB4*)szData)[i];
                AI_SWAP2(val);

                pcNew->pcData[i].a = (unsigned char)val.a << 4;
                pcNew->pcData[i].r = (unsigned char)val.r << 4;
                pcNew->pcData[i].g = (unsigned char)val.g << 4;
                pcNew->pcData[i].b = (unsigned char)val.b << 4;
            }
        }
        else i = pcNew->mWidth*pcNew->mHeight;
        *piSkip = i * 2;

        // apply MIP maps
        if (11 == iType)
        {
            *piSkip += ((i >> 2) + (i >> 4) + (i >> 6)) << 1;
            VALIDATE_FILE_SIZE(szData + *piSkip);
        }
    }
    // RGB8 format (with or without MIPs)
    // ****************************************************************
    else if (4 == iType || 12 == iType)
    {
        VALIDATE_FILE_SIZE(szData + pcNew->mWidth*pcNew->mHeight*3);

        // copy texture data
        unsigned int i;
        if (do_read)
        {
            for (i = 0; i < pcNew->mWidth*pcNew->mHeight;++i)
            {
                const unsigned char* _szData = &szData[i*3];

                pcNew->pcData[i].a = 0xFF;
                pcNew->pcData[i].b = *_szData++;
                pcNew->pcData[i].g = *_szData++;
                pcNew->pcData[i].r = *_szData;
            }
        }
        else i = pcNew->mWidth*pcNew->mHeight;


        // apply MIP maps
        *piSkip = i * 3;
        if (12 == iType)
        {
            *piSkip += ((i >> 2) + (i >> 4) + (i >> 6)) *3;
            VALIDATE_FILE_SIZE(szData + *piSkip);
        }
    }
    // ARGB8 format (with ir without MIPs)
    // ****************************************************************
    else if (5 == iType || 13 == iType)
    {
        VALIDATE_FILE_SIZE(szData + pcNew->mWidth*pcNew->mHeight*4);

        // copy texture data
        unsigned int i;
        if (do_read)
        {
            for (i = 0; i < pcNew->mWidth*pcNew->mHeight;++i)
            {
                const unsigned char* _szData = &szData[i*4];

                pcNew->pcData[i].b = *_szData++;
                pcNew->pcData[i].g = *_szData++;
                pcNew->pcData[i].r = *_szData++;
                pcNew->pcData[i].a = *_szData;
            }
        }
        else i = pcNew->mWidth*pcNew->mHeight;

        // apply MIP maps
        *piSkip = i << 2;
        if (13 == iType)
        {
            *piSkip += ((i >> 2) + (i >> 4) + (i >> 6)) << 2;
        }
    }
    // palletized 8 bit texture. As for Quake 1
    // ****************************************************************
    else if (0 == iType)
    {
        VALIDATE_FILE_SIZE(szData + pcNew->mWidth*pcNew->mHeight);

        // copy texture data
        unsigned int i;
        if (do_read)
        {

            const unsigned char* szColorMap;
            SearchPalette(&szColorMap);

            for (i = 0; i < pcNew->mWidth*pcNew->mHeight;++i)
            {
                const unsigned char val = szData[i];
                const unsigned char* sz = &szColorMap[val*3];

                pcNew->pcData[i].a = 0xFF;
                pcNew->pcData[i].r = *sz++;
                pcNew->pcData[i].g = *sz++;
                pcNew->pcData[i].b = *sz;
            }
            this->FreePalette(szColorMap);

        }
        else i = pcNew->mWidth*pcNew->mHeight;
        *piSkip = i;

        // FIXME: Also support for MIP maps?
    }
}

// ------------------------------------------------------------------------------------------------
// Get a texture from a MDL5 file
void MDLImporter::CreateTexture_3DGS_MDL5(const unsigned char* szData,
    unsigned int iType,
    unsigned int* piSkip)
{
    ai_assert(NULL != piSkip);
    bool bNoRead = *piSkip == UINT_MAX;

    // allocate a new texture object
    aiTexture* pcNew = new aiTexture();

    VALIDATE_FILE_SIZE(szData+8);

    // first read the size of the texture
    pcNew->mWidth = *((uint32_t*)szData);
    AI_SWAP4(pcNew->mWidth);
    szData += sizeof(uint32_t);

    pcNew->mHeight = *((uint32_t*)szData);
    AI_SWAP4(pcNew->mHeight);
    szData += sizeof(uint32_t);

    if (bNoRead) {
        pcNew->pcData = bad_texel;
    }

    // this should not occur - at least the docs say it shouldn't.
    // however, one can easily try out what MED does if you have
    // a model with a DDS texture and export it to MDL5 ...
    // yeah, it embedds the DDS file.
    if (6 == iType)
    {
        // this is a compressed texture in DDS format
        *piSkip = pcNew->mWidth;
        VALIDATE_FILE_SIZE(szData + *piSkip);

        if (!bNoRead)
        {
            // place a hint and let the application know that this is a DDS file
            pcNew->mHeight = 0;
            pcNew->achFormatHint[0] = 'd';
            pcNew->achFormatHint[1] = 'd';
            pcNew->achFormatHint[2] = 's';
            pcNew->achFormatHint[3] = '\0';

            pcNew->pcData = (aiTexel*) new unsigned char[pcNew->mWidth];
            ::memcpy(pcNew->pcData,szData,pcNew->mWidth);
        }
    }
    else
    {
        // parse the color data of the texture
        ParseTextureColorData(szData,iType,piSkip,pcNew);
    }
    *piSkip += sizeof(uint32_t) * 2;

    if (!bNoRead)
    {
        // store the texture
        if (!this->pScene->mNumTextures)
        {
            pScene->mNumTextures = 1;
            pScene->mTextures = new aiTexture*[1];
            pScene->mTextures[0] = pcNew;
        }
        else
        {
            aiTexture** pc = pScene->mTextures;
            pScene->mTextures = new aiTexture*[pScene->mNumTextures+1];
            for (unsigned int i = 0; i < pScene->mNumTextures;++i)
                this->pScene->mTextures[i] = pc[i];

            pScene->mTextures[pScene->mNumTextures] = pcNew;
            pScene->mNumTextures++;
            delete[] pc;
        }
    }
    else {
        pcNew->pcData = NULL;
        delete pcNew;
    }
    return;
}

// ------------------------------------------------------------------------------------------------
// Get a skin from a MDL7 file - more complex than all other subformats
void MDLImporter::ParseSkinLump_3DGS_MDL7(
    const unsigned char* szCurrent,
    const unsigned char** szCurrentOut,
    aiMaterial* pcMatOut,
    unsigned int iType,
    unsigned int iWidth,
    unsigned int iHeight)
{
    aiTexture* pcNew = NULL;

    // get the type of the skin
    unsigned int iMasked = (unsigned int)(iType & 0xF);

    if (0x1 ==  iMasked)
    {
        // ***** REFERENCE TO ANOTHER SKIN INDEX *****
        int referrer = (int)iWidth;
        pcMatOut->AddProperty<int>(&referrer,1,AI_MDL7_REFERRER_MATERIAL);
    }
    else if (0x6 == iMasked)
    {
        // ***** EMBEDDED DDS FILE *****
        if (1 != iHeight)
        {
            DefaultLogger::get()->warn("Found a reference to an embedded DDS texture, "
                "but texture height is not equal to 1, which is not supported by MED");
        }

        pcNew = new aiTexture();
        pcNew->mHeight = 0;
        pcNew->mWidth = iWidth;

        // place a proper format hint
        pcNew->achFormatHint[0] = 'd';
        pcNew->achFormatHint[1] = 'd';
        pcNew->achFormatHint[2] = 's';
        pcNew->achFormatHint[3] = '\0';

        pcNew->pcData = (aiTexel*) new unsigned char[pcNew->mWidth];
        memcpy(pcNew->pcData,szCurrent,pcNew->mWidth);
        szCurrent += iWidth;
    }
    if (0x7 == iMasked)
    {
        // ***** REFERENCE TO EXTERNAL FILE *****
        if (1 != iHeight)
        {
            DefaultLogger::get()->warn("Found a reference to an external texture, "
                "but texture height is not equal to 1, which is not supported by MED");
        }

        aiString szFile;
        const size_t iLen = strlen((const char*)szCurrent);
        size_t iLen2 = iLen+1;
        iLen2 = iLen2 > MAXLEN ? MAXLEN : iLen2;
        memcpy(szFile.data,(const char*)szCurrent,iLen2);
        szFile.length = iLen;

        szCurrent += iLen2;

        // place this as diffuse texture
        pcMatOut->AddProperty(&szFile,AI_MATKEY_TEXTURE_DIFFUSE(0));
    }
    else if (iMasked || !iType || (iType && iWidth && iHeight))
    {
        // ***** STANDARD COLOR TEXTURE *****
        pcNew = new aiTexture();
        if (!iHeight || !iWidth)
        {
            DefaultLogger::get()->warn("Found embedded texture, but its width "
                "an height are both 0. Is this a joke?");

            // generate an empty chess pattern
            pcNew->mWidth = pcNew->mHeight = 8;
            pcNew->pcData = new aiTexel[64];
            for (unsigned int x = 0; x < 8;++x)
            {
                for (unsigned int y = 0; y < 8;++y)
                {
                    const bool bSet = ((0 == x % 2 && 0 != y % 2) ||
                        (0 != x % 2 && 0 == y % 2));

                    aiTexel* pc = &pcNew->pcData[y * 8 + x];
                    pc->r = pc->b = pc->g = (bSet?0xFF:0);
                    pc->a = 0xFF;
                }
            }
        }
        else
        {
            // it is a standard color texture. Fill in width and height
            // and call the same function we used for loading MDL5 files

            pcNew->mWidth = iWidth;
            pcNew->mHeight = iHeight;

            unsigned int iSkip = 0;
            ParseTextureColorData(szCurrent,iMasked,&iSkip,pcNew);

            // skip length of texture data
            szCurrent += iSkip;
        }
    }

    // sometimes there are MDL7 files which have a monochrome
    // texture instead of material colors ... posssible they have
    // been converted to MDL7 from other formats, such as MDL5
    aiColor4D clrTexture;
    if (pcNew)clrTexture = ReplaceTextureWithColor(pcNew);
    else clrTexture.r = get_qnan();

    // check whether a material definition is contained in the skin
    if (iType & AI_MDL7_SKINTYPE_MATERIAL)
    {
        BE_NCONST MDL::Material_MDL7* pcMatIn = (BE_NCONST MDL::Material_MDL7*)szCurrent;
        szCurrent = (unsigned char*)(pcMatIn+1);
        VALIDATE_FILE_SIZE(szCurrent);

        aiColor3D clrTemp;

#define COLOR_MULTIPLY_RGB() \
    if (is_not_qnan(clrTexture.r)) \
        { \
        clrTemp.r *= clrTexture.r; \
        clrTemp.g *= clrTexture.g; \
        clrTemp.b *= clrTexture.b; \
        }

        // read diffuse color
        clrTemp.r = pcMatIn->Diffuse.r;
        AI_SWAP4(clrTemp.r);
        clrTemp.g = pcMatIn->Diffuse.g;
        AI_SWAP4(clrTemp.g);
        clrTemp.b = pcMatIn->Diffuse.b;
        AI_SWAP4(clrTemp.b);
        COLOR_MULTIPLY_RGB();
        pcMatOut->AddProperty<aiColor3D>(&clrTemp,1,AI_MATKEY_COLOR_DIFFUSE);

        // read specular color
        clrTemp.r = pcMatIn->Specular.r;
        AI_SWAP4(clrTemp.r);
        clrTemp.g = pcMatIn->Specular.g;
        AI_SWAP4(clrTemp.g);
        clrTemp.b = pcMatIn->Specular.b;
        AI_SWAP4(clrTemp.b);
        COLOR_MULTIPLY_RGB();
        pcMatOut->AddProperty<aiColor3D>(&clrTemp,1,AI_MATKEY_COLOR_SPECULAR);

        // read ambient color
        clrTemp.r = pcMatIn->Ambient.r;
        AI_SWAP4(clrTemp.r);
        clrTemp.g = pcMatIn->Ambient.g;
        AI_SWAP4(clrTemp.g);
        clrTemp.b = pcMatIn->Ambient.b;
        AI_SWAP4(clrTemp.b);
        COLOR_MULTIPLY_RGB();
        pcMatOut->AddProperty<aiColor3D>(&clrTemp,1,AI_MATKEY_COLOR_AMBIENT);

        // read emissive color
        clrTemp.r = pcMatIn->Emissive.r;
        AI_SWAP4(clrTemp.r);
        clrTemp.g = pcMatIn->Emissive.g;
        AI_SWAP4(clrTemp.g);
        clrTemp.b = pcMatIn->Emissive.b;
        AI_SWAP4(clrTemp.b);
        pcMatOut->AddProperty<aiColor3D>(&clrTemp,1,AI_MATKEY_COLOR_EMISSIVE);

#undef COLOR_MULITPLY_RGB

        // FIX: Take the opacity from the ambient color.
        // The doc say something else, but it is fact that MED exports the
        // opacity like this .... oh well.
        clrTemp.r = pcMatIn->Ambient.a;
        AI_SWAP4(clrTemp.r);
        if (is_not_qnan(clrTexture.r)) {
            clrTemp.r *= clrTexture.a;
        }
        pcMatOut->AddProperty<float>(&clrTemp.r,1,AI_MATKEY_OPACITY);

        // read phong power
        int iShadingMode = (int)aiShadingMode_Gouraud;
        AI_SWAP4(pcMatIn->Power);
        if (0.0f != pcMatIn->Power)
        {
            iShadingMode = (int)aiShadingMode_Phong;
            pcMatOut->AddProperty<float>(&pcMatIn->Power,1,AI_MATKEY_SHININESS);
        }
        pcMatOut->AddProperty<int>(&iShadingMode,1,AI_MATKEY_SHADING_MODEL);
    }
    else if (is_not_qnan(clrTexture.r))
    {
        pcMatOut->AddProperty<aiColor4D>(&clrTexture,1,AI_MATKEY_COLOR_DIFFUSE);
        pcMatOut->AddProperty<aiColor4D>(&clrTexture,1,AI_MATKEY_COLOR_SPECULAR);
    }
    // if the texture could be replaced by a single material color
    // we don't need the texture anymore
    if (is_not_qnan(clrTexture.r))
    {
        delete pcNew;
        pcNew = NULL;
    }

    // If an ASCII effect description (HLSL?) is contained in the file,
    // we can simply ignore it ...
    if (iType & AI_MDL7_SKINTYPE_MATERIAL_ASCDEF)
    {
        VALIDATE_FILE_SIZE(szCurrent);
        int32_t iMe = *((int32_t*)szCurrent);
        AI_SWAP4(iMe);
        szCurrent += sizeof(char) * iMe + sizeof(int32_t);
        VALIDATE_FILE_SIZE(szCurrent);
    }

    // If an embedded texture has been loaded setup the corresponding
    // data structures in the aiScene instance
    if (pcNew && pScene->mNumTextures <= 999)
    {

        // place this as diffuse texture
        char szCurrent[5];
        ::sprintf(szCurrent,"*%i",this->pScene->mNumTextures);

        aiString szFile;
        const size_t iLen = strlen((const char*)szCurrent);
        ::memcpy(szFile.data,(const char*)szCurrent,iLen+1);
        szFile.length = iLen;

        pcMatOut->AddProperty(&szFile,AI_MATKEY_TEXTURE_DIFFUSE(0));

        // store the texture
        if (!pScene->mNumTextures)
        {
            pScene->mNumTextures = 1;
            pScene->mTextures = new aiTexture*[1];
            pScene->mTextures[0] = pcNew;
        }
        else
        {
            aiTexture** pc = pScene->mTextures;
            pScene->mTextures = new aiTexture*[pScene->mNumTextures+1];
            for (unsigned int i = 0; i < pScene->mNumTextures;++i) {
                pScene->mTextures[i] = pc[i];
            }

            pScene->mTextures[pScene->mNumTextures] = pcNew;
            pScene->mNumTextures++;
            delete[] pc;
        }
    }
    VALIDATE_FILE_SIZE(szCurrent);
    *szCurrentOut = szCurrent;
}

// ------------------------------------------------------------------------------------------------
// Skip a skin lump
void MDLImporter::SkipSkinLump_3DGS_MDL7(
    const unsigned char* szCurrent,
    const unsigned char** szCurrentOut,
    unsigned int iType,
    unsigned int iWidth,
    unsigned int iHeight)
{
    // get the type of the skin
    const unsigned int iMasked = (unsigned int)(iType & 0xF);

    if (0x6 == iMasked)
    {
        szCurrent += iWidth;
    }
    if (0x7 == iMasked)
    {
        const size_t iLen = ::strlen((const char*)szCurrent);
        szCurrent += iLen+1;
    }
    else if (iMasked || !iType)
    {
        if (iMasked || !iType || (iType && iWidth && iHeight))
        {
            // ParseTextureColorData(..., aiTexture::pcData == bad_texel) will simply
            // return the size of the color data in bytes in iSkip
            unsigned int iSkip = 0;

            aiTexture tex;
            tex.pcData = bad_texel;
            tex.mHeight = iHeight;
            tex.mWidth = iWidth;
            ParseTextureColorData(szCurrent,iMasked,&iSkip,&tex);

            // FIX: Important, otherwise the destructor will crash
            tex.pcData = NULL;

            // skip length of texture data
            szCurrent += iSkip;
        }
    }

    // check whether a material definition is contained in the skin
    if (iType & AI_MDL7_SKINTYPE_MATERIAL)
    {
        BE_NCONST MDL::Material_MDL7* pcMatIn = (BE_NCONST MDL::Material_MDL7*)szCurrent;
        szCurrent = (unsigned char*)(pcMatIn+1);
    }

    // if an ASCII effect description (HLSL?) is contained in the file,
    // we can simply ignore it ...
    if (iType & AI_MDL7_SKINTYPE_MATERIAL_ASCDEF)
    {
        int32_t iMe = *((int32_t*)szCurrent);
        AI_SWAP4(iMe);
        szCurrent += sizeof(char) * iMe + sizeof(int32_t);
    }
    *szCurrentOut = szCurrent;
}

// ------------------------------------------------------------------------------------------------
void MDLImporter::ParseSkinLump_3DGS_MDL7(
    const unsigned char* szCurrent,
    const unsigned char** szCurrentOut,
    std::vector<aiMaterial*>& pcMats)
{
    ai_assert(NULL != szCurrent);
    ai_assert(NULL != szCurrentOut);

    *szCurrentOut = szCurrent;
    BE_NCONST MDL::Skin_MDL7* pcSkin = (BE_NCONST MDL::Skin_MDL7*)szCurrent;
    AI_SWAP4(pcSkin->width);
    AI_SWAP4(pcSkin->height);
    szCurrent += 12;

    // allocate an output material
    aiMaterial* pcMatOut = new aiMaterial();
    pcMats.push_back(pcMatOut);

    // skip length of file name
    szCurrent += AI_MDL7_MAX_TEXNAMESIZE;

    ParseSkinLump_3DGS_MDL7(szCurrent,szCurrentOut,pcMatOut,
        pcSkin->typ,pcSkin->width,pcSkin->height);

    // place the name of the skin in the material
    if (pcSkin->texture_name[0])
    {
        // the 0 termination could be there or not - we can't know
        aiString szFile;
        ::memcpy(szFile.data,pcSkin->texture_name,sizeof(pcSkin->texture_name));
        szFile.data[sizeof(pcSkin->texture_name)] = '\0';
        szFile.length = ::strlen(szFile.data);

        pcMatOut->AddProperty(&szFile,AI_MATKEY_NAME);
    }
}

#endif // !! ASSIMP_BUILD_NO_MDL_IMPORTER