assimp.assimp/code/HMPLoader.cpp

/*
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Open Asset Import Library (ASSIMP)
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*/

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

#include "AssimpPCH.h"

// internal headers
#include "MaterialSystem.h"
#include "HMPLoader.h"
#include "MD2FileData.h"


using namespace Assimp;

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

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

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool HMPImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler) const
{
	// simple check of file extension is enough for the moment
	std::string::size_type pos = pFile.find_last_of('.');
	// no file extension - can't read
	if( pos == std::string::npos)
		return false;
	std::string extension = pFile.substr( pos);

	if (extension.length() < 4)return false;
	if (extension[0] != '.')return false;
	if (extension[1] != 'h' && extension[1] != 'H')return false;
	if (extension[2] != 'm' && extension[2] != 'M')return false;
	if (extension[3] != 'p' && extension[3] != 'P')return false;

	return true;
}
// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void HMPImporter::InternReadFile( 
	const std::string& pFile, aiScene* pScene, IOSystem* pIOHandler)
{
	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile));

	// Check whether we can read from the file
	if( file.get() == NULL)
	{
		throw new ImportErrorException( "Failed to open HMP file " + pFile + ".");
	}

	// check whether the HMP file is large enough to contain
	// at least the file header
	size_t fileSize = file->FileSize();
	if( fileSize < 50)
	{
		throw new ImportErrorException( "HMP File is too small.");
	}

	// allocate storage and copy the contents of the file to a memory buffer
	this->pScene = pScene;
	this->pIOHandler = pIOHandler;
	this->mBuffer = new unsigned char[fileSize+1];
	file->Read( (void*)mBuffer, 1, fileSize);

	this->iFileSize = (unsigned int)fileSize;

	// determine the file subtype and call the appropriate member function
	uint32_t iMagic = *((uint32_t*)this->mBuffer);

	try {

	// HMP4 format
	if (AI_HMP_MAGIC_NUMBER_LE_4 == iMagic ||
		AI_HMP_MAGIC_NUMBER_BE_4 == iMagic)
	{
		DefaultLogger::get()->debug("HMP subtype: 3D GameStudio A4, magic word is HMP4");
		this->InternReadFile_HMP4();
	}
	// HMP5 format
	else if (AI_HMP_MAGIC_NUMBER_LE_5 == iMagic ||
			 AI_HMP_MAGIC_NUMBER_BE_5 == iMagic)
	{
		DefaultLogger::get()->debug("HMP subtype: 3D GameStudio A5, magic word is HMP5");
		this->InternReadFile_HMP5();
	}
	// HMP7 format
	else if (AI_HMP_MAGIC_NUMBER_LE_7 == iMagic ||
			 AI_HMP_MAGIC_NUMBER_BE_7 == iMagic)
	{
		DefaultLogger::get()->debug("HMP subtype: 3D GameStudio A7, magic word is HMP7");
		this->InternReadFile_HMP7();
	}
	else
	{
		// print the magic word to the logger
		char szBuffer[5];
		szBuffer[0] = ((char*)&iMagic)[0];
		szBuffer[1] = ((char*)&iMagic)[1];
		szBuffer[2] = ((char*)&iMagic)[2];
		szBuffer[3] = ((char*)&iMagic)[3];
		szBuffer[4] = '\0';

		// we're definitely unable to load this file
		throw new ImportErrorException( "Unknown HMP subformat " + pFile +
			". Magic word (" + szBuffer + ") is not known");
	}

	} catch (ImportErrorException* ex) {
		delete[] this->mBuffer;
		throw ex;
	}

	// delete the file buffer
	delete[] this->mBuffer;
	return;
}
// ------------------------------------------------------------------------------------------------ 
void HMPImporter::ValidateHeader_HMP457( )
{
	const HMP::Header_HMP5* const pcHeader = (const HMP::Header_HMP5*)this->mBuffer;

	if (120 > this->iFileSize)
	{
		throw new ImportErrorException("HMP file is too small (header size is "
			"120 bytes, this file is smaller)");
	}

	if (!pcHeader->ftrisize_x || !pcHeader->ftrisize_y)
	{
		throw new ImportErrorException("Size of triangles in either  x or y direction is zero");
	}
	if(pcHeader->fnumverts_x < 1.0f || (pcHeader->numverts/pcHeader->fnumverts_x) < 1.0f)
	{
		throw new ImportErrorException("Number of triangles in either x or y direction is zero");
	}
	if(!pcHeader->numframes)
	{
		throw new ImportErrorException("There are no frames. At least one should be there");
	}
}
// ------------------------------------------------------------------------------------------------ 
void HMPImporter::InternReadFile_HMP4( )
{
	throw new ImportErrorException("HMP4 is currently not supported");
}
// ------------------------------------------------------------------------------------------------ 
void HMPImporter::InternReadFile_HMP5( )
{
	// read the file header and skip everything to byte 84
	const HMP::Header_HMP5* pcHeader = (const HMP::Header_HMP5*)this->mBuffer;
	const unsigned char* szCurrent = (const unsigned char*)(this->mBuffer+84);
	this->ValidateHeader_HMP457();

	// generate an output mesh
	this->pScene->mNumMeshes = 1;
	this->pScene->mMeshes = new aiMesh*[1];
	aiMesh* pcMesh = this->pScene->mMeshes[0] = new aiMesh();

	pcMesh->mMaterialIndex = 0;
	pcMesh->mVertices = new aiVector3D[pcHeader->numverts];
	pcMesh->mNormals = new aiVector3D[pcHeader->numverts];

	const unsigned int height = (unsigned int)(pcHeader->numverts / pcHeader->fnumverts_x);
	const unsigned int width = (unsigned int)pcHeader->fnumverts_x;

	// generate/load a material for the terrain
	this->CreateMaterial(szCurrent,&szCurrent);

	// goto offset 120, I don't know why ...
	// (fixme) is this the frame header? I assume yes since it starts with 2. 
	szCurrent += 36;

	this->SizeCheck(szCurrent + sizeof(const HMP::Vertex_HMP7)*height*width);

	// now load all vertices from the file
	aiVector3D* pcVertOut = pcMesh->mVertices;
	aiVector3D* pcNorOut = pcMesh->mNormals;
	const HMP::Vertex_HMP5* src = (const HMP::Vertex_HMP5*) szCurrent;
	for (unsigned int y = 0; y < height;++y)
	{
		for (unsigned int x = 0; x < width;++x)
		{
			pcVertOut->x = x * pcHeader->ftrisize_x;
			pcVertOut->y = y * pcHeader->ftrisize_y;
			pcVertOut->z = (((float)src->z / 0xffff)-0.5f) * pcHeader->ftrisize_x * 8.0f; 
			MD2::LookupNormalIndex(src->normals162index, *pcNorOut );
			++pcVertOut;++pcNorOut;++src;
		}
	}

	// generate texture coordinates if necessary
	if (pcHeader->numskins)this->GenerateTextureCoords(width,height);

	// now build a list of faces
	this->CreateOutputFaceList(width,height);	

	// there is no nodegraph in HMP files. Simply assign the one mesh
	// (no, not the one ring) to the root node
	this->pScene->mRootNode = new aiNode();
	this->pScene->mRootNode->mName.Set("terrain_root");
	this->pScene->mRootNode->mNumMeshes = 1;
	this->pScene->mRootNode->mMeshes = new unsigned int[1];
	this->pScene->mRootNode->mMeshes[0] = 0;
}
// ------------------------------------------------------------------------------------------------ 
void HMPImporter::InternReadFile_HMP7( )
{
	// read the file header and skip everything to byte 84
	const HMP::Header_HMP5* const pcHeader = (const HMP::Header_HMP5*)this->mBuffer;
	const unsigned char* szCurrent = (const unsigned char*)(this->mBuffer+84);
	this->ValidateHeader_HMP457();

	// generate an output mesh
	this->pScene->mNumMeshes = 1;
	this->pScene->mMeshes = new aiMesh*[1];
	aiMesh* pcMesh = this->pScene->mMeshes[0] = new aiMesh();

	pcMesh->mMaterialIndex = 0;
	pcMesh->mVertices = new aiVector3D[pcHeader->numverts];
	pcMesh->mNormals = new aiVector3D[pcHeader->numverts];

	const unsigned int height = (unsigned int)(pcHeader->numverts / pcHeader->fnumverts_x);
	const unsigned int width = (unsigned int)pcHeader->fnumverts_x;

	// generate/load a material for the terrain
	this->CreateMaterial(szCurrent,&szCurrent);

	// goto offset 120, I don't know why ...
	// (fixme) is this the frame header? I assume yes since it starts with 2. 
	szCurrent += 36;

	this->SizeCheck(szCurrent + sizeof(const HMP::Vertex_HMP7)*height*width);

	// now load all vertices from the file
	aiVector3D* pcVertOut = pcMesh->mVertices;
	aiVector3D* pcNorOut = pcMesh->mNormals;
	const HMP::Vertex_HMP7* src = (const HMP::Vertex_HMP7*) szCurrent;
	for (unsigned int y = 0; y < height;++y)
	{
		for (unsigned int x = 0; x < width;++x)
		{
			pcVertOut->x = x * pcHeader->ftrisize_x;
			pcVertOut->y = y * pcHeader->ftrisize_y;

			// FIXME: What exctly is the correct scaling factor to use?
			// possibly pcHeader->scale_origin[2] in combination with a
			// signed interpretation of src->z?
			pcVertOut->z = (((float)src->z / 0xffff)-0.5f) * pcHeader->ftrisize_x * 8.0f; 

			pcNorOut->x = ((float)src->normal_x / 0x80 ); // * pcHeader->scale_origin[0];
			pcNorOut->y = ((float)src->normal_y / 0x80 ); // * pcHeader->scale_origin[1];
			pcNorOut->z = 1.0f;
			pcNorOut->Normalize();
			
			++pcVertOut;++pcNorOut;++src;
		}
	}

	// generate texture coordinates if necessary
	if (pcHeader->numskins)this->GenerateTextureCoords(width,height);

	// now build a list of faces
	this->CreateOutputFaceList(width,height);	

	// there is no nodegraph in HMP files. Simply assign the one mesh
	// (no, not the One Ring) to the root node
	this->pScene->mRootNode = new aiNode();
	this->pScene->mRootNode->mName.Set("terrain_root");
	this->pScene->mRootNode->mNumMeshes = 1;
	this->pScene->mRootNode->mMeshes = new unsigned int[1];
	this->pScene->mRootNode->mMeshes[0] = 0;
}
// ------------------------------------------------------------------------------------------------ 
void HMPImporter::CreateMaterial(const unsigned char* szCurrent,
	const unsigned char** szCurrentOut)
{
	aiMesh* const pcMesh = this->pScene->mMeshes[0];
	const HMP::Header_HMP5* const pcHeader = (const HMP::Header_HMP5*)this->mBuffer;

	// we don't need to generate texture coordinates if
	// we have no textures in the file ...
	if (pcHeader->numskins)
	{
		pcMesh->mTextureCoords[0] = new aiVector3D[pcHeader->numverts];
		pcMesh->mNumUVComponents[0] = 2;

		// now read the first skin and skip all others
		this->ReadFirstSkin(pcHeader->numskins,szCurrent,&szCurrent);
	}
	else
	{
		// generate a default material
		const int iMode = (int)aiShadingMode_Gouraud;
		MaterialHelper* pcHelper = new MaterialHelper();
		pcHelper->AddProperty<int>(&iMode, 1, AI_MATKEY_SHADING_MODEL);

		aiColor3D clr;
		clr.b = clr.g = clr.r = 0.6f;
		pcHelper->AddProperty<aiColor3D>(&clr, 1,AI_MATKEY_COLOR_DIFFUSE);
		pcHelper->AddProperty<aiColor3D>(&clr, 1,AI_MATKEY_COLOR_SPECULAR);

		clr.b = clr.g = clr.r = 0.05f;
		pcHelper->AddProperty<aiColor3D>(&clr, 1,AI_MATKEY_COLOR_AMBIENT);

		aiString szName;
		szName.Set(AI_DEFAULT_MATERIAL_NAME);
		pcHelper->AddProperty(&szName,AI_MATKEY_NAME);

		// add the material to the scene
		this->pScene->mNumMaterials = 1;
		this->pScene->mMaterials = new aiMaterial*[1];
		this->pScene->mMaterials[0] = pcHelper;
	}
	*szCurrentOut = szCurrent;
}
// ------------------------------------------------------------------------------------------------ 
void HMPImporter::CreateOutputFaceList(unsigned int width,unsigned int height)
{
	aiMesh* const pcMesh = this->pScene->mMeshes[0];

	// allocate enough storage
	const unsigned int iNumSquares = (width-1) * (height-1);
	pcMesh->mNumFaces = iNumSquares << 1;
	pcMesh->mFaces = new aiFace[pcMesh->mNumFaces];

	pcMesh->mNumVertices = pcMesh->mNumFaces*3;
	aiVector3D* pcVertices = new aiVector3D[pcMesh->mNumVertices];
	aiVector3D* pcNormals = new aiVector3D[pcMesh->mNumVertices];

	aiFace* pcFaceOut(pcMesh->mFaces);
	aiVector3D* pcVertOut = pcVertices;
	aiVector3D* pcNorOut = pcNormals;

	aiVector3D* pcUVs = pcMesh->mTextureCoords[0] ? new aiVector3D[pcMesh->mNumVertices] : NULL;
	aiVector3D* pcUVOut(pcUVs);

	// build the terrain square
	unsigned int iCurrent = 0;
	for (unsigned int y = 0; y < height-1;++y)
	{
		for (unsigned int x = 0; x < width-1;++x)
		{
			// first triangle of the square
			pcFaceOut->mNumIndices = 3;
			pcFaceOut->mIndices = new unsigned int[3];

			*pcVertOut++ = pcMesh->mVertices[y*width+x];
			*pcVertOut++ = pcMesh->mVertices[y*width+x+1];
			*pcVertOut++ = pcMesh->mVertices[(y+1)*width+x];

			*pcNorOut++ = pcMesh->mNormals[y*width+x];
			*pcNorOut++ = pcMesh->mNormals[y*width+x+1];
			*pcNorOut++ = pcMesh->mNormals[(y+1)*width+x];

			if (pcMesh->mTextureCoords[0])
			{
				*pcUVOut++ = pcMesh->mTextureCoords[0][y*width+x];
				*pcUVOut++ = pcMesh->mTextureCoords[0][y*width+x+1];
				*pcUVOut++ = pcMesh->mTextureCoords[0][(y+1)*width+x];
			}
			
			pcFaceOut->mIndices[2] = iCurrent++;
			pcFaceOut->mIndices[1] = iCurrent++;
			pcFaceOut->mIndices[0] = iCurrent++;
			++pcFaceOut;

			// second triangle of the square
			pcFaceOut->mNumIndices = 3;
			pcFaceOut->mIndices = new unsigned int[3];

			*pcVertOut++ = pcMesh->mVertices[(y+1)*width+x];
			*pcVertOut++ = pcMesh->mVertices[y*width+x+1];
			*pcVertOut++ = pcMesh->mVertices[(y+1)*width+x+1];

			*pcNorOut++ = pcMesh->mNormals[(y+1)*width+x];
			*pcNorOut++ = pcMesh->mNormals[y*width+x+1];
			*pcNorOut++ = pcMesh->mNormals[(y+1)*width+x+1];

			if (pcMesh->mTextureCoords[0])
			{
				*pcUVOut++ = pcMesh->mTextureCoords[0][(y+1)*width+x];
				*pcUVOut++ = pcMesh->mTextureCoords[0][y*width+x+1];
				*pcUVOut++ = pcMesh->mTextureCoords[0][(y+1)*width+x+1];
			}
			
			pcFaceOut->mIndices[2] = iCurrent++;
			pcFaceOut->mIndices[1] = iCurrent++;
			pcFaceOut->mIndices[0] = iCurrent++;
			++pcFaceOut;
		}
	}
	delete[] pcMesh->mVertices;
	pcMesh->mVertices = pcVertices;

	delete[] pcMesh->mNormals;
	pcMesh->mNormals = pcNormals;

	if (pcMesh->mTextureCoords[0])
	{
		delete[] pcMesh->mTextureCoords[0];
		pcMesh->mTextureCoords[0] = pcUVs;
	}
}
// ------------------------------------------------------------------------------------------------ 
void HMPImporter::ReadFirstSkin(unsigned int iNumSkins, const unsigned char* szCursor,
	const unsigned char** szCursorOut)
{
	ai_assert(0 != iNumSkins && NULL != szCursor);

	// read the type of the skin ...
	// sometimes we need to skip 12 bytes here, I don't know why ...
	uint32_t iType = *((uint32_t*)szCursor);szCursor += sizeof(uint32_t);
	if (0 == iType)
	{
		DefaultLogger::get()->warn("Skin type is 0. Skipping 12 bytes to "
			"the next valid value, which seems to be the real skin type. "
			"However, it is not known whether or not this is correct.");
		szCursor += sizeof(uint32_t) * 2;
		iType = *((uint32_t*)szCursor);szCursor += sizeof(uint32_t);
		if (0 == iType)
		{
			throw new ImportErrorException("Unable to read HMP7 skin chunk");
		}
	}
	// read width and height
	uint32_t iWidth = *((uint32_t*)szCursor);szCursor += sizeof(uint32_t);
	uint32_t iHeight = *((uint32_t*)szCursor);szCursor += sizeof(uint32_t);

	// allocate an output material
	MaterialHelper* pcMat = new MaterialHelper();

	// read the skin, this works exactly as for MDL7
	this->ParseSkinLump_3DGS_MDL7(szCursor,&szCursor,
		pcMat,iType,iWidth,iHeight);

	// now we need to skip any other skins ... 
	for (unsigned int i = 1; i< iNumSkins;++i)
	{
		iType = *((uint32_t*)szCursor);szCursor += sizeof(uint32_t);
		iWidth = *((uint32_t*)szCursor);szCursor += sizeof(uint32_t);
		iHeight = *((uint32_t*)szCursor);szCursor += sizeof(uint32_t);

		this->SkipSkinLump_3DGS_MDL7(szCursor,&szCursor,
			iType,iWidth,iHeight);

		this->SizeCheck(szCursor);
	}

	// setup the material ...
	this->pScene->mNumMaterials = 1;
	this->pScene->mMaterials = new aiMaterial*[1];
	this->pScene->mMaterials[0] = pcMat;

	*szCursorOut = szCursor;
	return;
}
// ------------------------------------------------------------------------------------------------ 
void HMPImporter::GenerateTextureCoords(
	const unsigned int width, const unsigned int height)
{
	ai_assert(NULL != this->pScene->mMeshes && NULL != this->pScene->mMeshes[0] &&
		NULL != this->pScene->mMeshes[0]->mTextureCoords[0]);

	aiVector3D* uv = this->pScene->mMeshes[0]->mTextureCoords[0];

	const float fY = (1.0f / height) + (1.0f / height) / (height-1);
	const float fX = (1.0f / width) + (1.0f / width) / (width-1);

	for (unsigned int y = 0; y < height;++y)
	{
		for (unsigned int x = 0; x < width;++x)
		{
			uv->y = 1.0f-fY*y;
			uv->x = fX*x;
			uv->z = 0.0f;
			++uv;
		}
	}
	return;
}