assimp.assimp/code/MD3Loader.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (ASSIMP)
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Copyright (c) 2006-2008, ASSIMP Development Team

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  following disclaimer.

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  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/

/** @file Implementation of the MD3 importer class */
#include "MD3Loader.h"
#include "MaterialSystem.h"
#include "StringComparison.h"

#include "../include/IOStream.h"
#include "../include/IOSystem.h"
#include "../include/aiMesh.h"
#include "../include/aiScene.h"
#include "../include/aiAssert.h"
#include "../include/DefaultLogger.h"

#include <boost/scoped_ptr.hpp>

using namespace Assimp;


// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
MD3Importer::MD3Importer()
{
}

// ------------------------------------------------------------------------------------------------
// Destructor, private as well 
MD3Importer::~MD3Importer()
{
}

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool MD3Importer::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] != 'm' && extension[1] != 'M')return false;
	if (extension[2] != 'd' && extension[2] != 'D')return false;
	if (extension[3] != '3')return false;

	return true;
}
// ------------------------------------------------------------------------------------------------
void MD3Importer::ValidateHeaderOffsets()
{
	// check file format version
	if (this->m_pcHeader->VERSION > 15)
		DefaultLogger::get()->warn( "Unsupported md3 file version. Continuing happily ...");

	// check some values whether they are valid
	if (0 == this->m_pcHeader->NUM_FRAMES)
		throw new ImportErrorException( "Invalid md3 file: NUM_FRAMES is 0");
	if (0 == this->m_pcHeader->NUM_SURFACES)
		throw new ImportErrorException( "Invalid md3 file: NUM_SURFACES is 0");

	if (this->m_pcHeader->OFS_FRAMES	>= this->fileSize ||
		this->m_pcHeader->OFS_SURFACES	>= this->fileSize || 
		this->m_pcHeader->OFS_EOF		> this->fileSize)
	{
		throw new ImportErrorException("Invalid MD3 header: some offsets are outside the file");
	}
}
// ------------------------------------------------------------------------------------------------
void MD3Importer::ValidateSurfaceHeaderOffsets(const MD3::Surface* pcSurf)
{
	// calculate the relative offset of the surface
	int32_t ofs = int32_t((const unsigned char*)pcSurf-this->mBuffer);

	if (pcSurf->OFS_TRIANGLES	+ ofs + pcSurf->NUM_TRIANGLES * sizeof(MD3::Triangle)	> this->fileSize ||
		pcSurf->OFS_SHADERS		+ ofs + pcSurf->NUM_SHADER * sizeof(MD3::Shader)		> this->fileSize ||
		pcSurf->OFS_ST			+ ofs + pcSurf->NUM_VERTICES * sizeof(MD3::TexCoord)	> this->fileSize ||
		pcSurf->OFS_XYZNORMAL	+ ofs + pcSurf->NUM_VERTICES * sizeof(MD3::Vertex)		> this->fileSize)
	{
		throw new ImportErrorException("Invalid MD3 surface header: some offsets are outside the file");
	}

	if (pcSurf->NUM_TRIANGLES > AI_MD3_MAX_TRIANGLES)
		DefaultLogger::get()->warn("The model contains more triangles than Quake 3 supports");
	if (pcSurf->NUM_SHADER > AI_MD3_MAX_SHADERS)
		DefaultLogger::get()->warn("The model contains more shaders than Quake 3 supports");
	if (pcSurf->NUM_VERTICES > AI_MD3_MAX_VERTS)
		DefaultLogger::get()->warn("The model contains more vertices than Quake 3 supports");
	if (pcSurf->NUM_FRAMES > AI_MD3_MAX_FRAMES)
		DefaultLogger::get()->warn("The model contains more frames than Quake 3 supports");
}
// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void MD3Importer::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 md3 file " + pFile + ".");
	}

	// check whether the md3 file is large enough to contain
	// at least the file header
	fileSize = (unsigned int)file->FileSize();
	if( fileSize < sizeof(MD3::Header))
	{
		throw new ImportErrorException( ".md3 File is too small.");
	}

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

	try
	{

		this->m_pcHeader = (const MD3::Header*)this->mBuffer;

		// check magic number
		if (this->m_pcHeader->IDENT != AI_MD3_MAGIC_NUMBER_BE &&
			this->m_pcHeader->IDENT != AI_MD3_MAGIC_NUMBER_LE)
		{
			throw new ImportErrorException( "Invalid md3 file: Magic bytes not found");
		}
		// validate the header
		this->ValidateHeaderOffsets();

		// now navigate to the list of surfaces
		const MD3::Surface* pcSurfaces = (const MD3::Surface*)
			(this->mBuffer + this->m_pcHeader->OFS_SURFACES);

		// allocate output storage
		pScene->mNumMeshes = this->m_pcHeader->NUM_SURFACES;
		pScene->mMeshes = new aiMesh*[pScene->mNumMeshes];

		pScene->mNumMaterials = this->m_pcHeader->NUM_SURFACES;
		pScene->mMaterials = new aiMaterial*[pScene->mNumMeshes];

		// if an exception is thrown before the meshes are allocated ->
		// otherwise the pointer value would be invalid and delete would crash
		::memset(pScene->mMeshes,0,pScene->mNumMeshes*sizeof(aiMesh*));
		::memset(pScene->mMaterials,0,pScene->mNumMaterials*sizeof(aiMaterial*));

		unsigned int iNum = this->m_pcHeader->NUM_SURFACES;
		unsigned int iNumMaterials = 0;
		unsigned int iDefaultMatIndex = 0xFFFFFFFF;
		while (iNum-- > 0)
		{
			// validate the surface
			this->ValidateSurfaceHeaderOffsets(pcSurfaces);

			// navigate to the vertex list of the surface
			const MD3::Vertex* pcVertices = (const MD3::Vertex*)
				(((unsigned char*)pcSurfaces) + pcSurfaces->OFS_XYZNORMAL);

			// navigate to the triangle list of the surface
			const MD3::Triangle* pcTriangles = (const MD3::Triangle*)
				(((unsigned char*)pcSurfaces) + pcSurfaces->OFS_TRIANGLES);

			// navigate to the texture coordinate list of the surface
			const MD3::TexCoord* pcUVs = (const MD3::TexCoord*)
				(((unsigned char*)pcSurfaces) + pcSurfaces->OFS_ST);

			// navigate to the shader list of the surface
			const MD3::Shader* pcShaders = (const MD3::Shader*)
				(((unsigned char*)pcSurfaces) + pcSurfaces->OFS_SHADERS);

			// if the submesh is empty ignore it
			if (0 == pcSurfaces->NUM_VERTICES || 0 == pcSurfaces->NUM_TRIANGLES)
			{
				pcSurfaces = (const MD3::Surface*)(((unsigned char*)pcSurfaces) + pcSurfaces->OFS_END);
				pScene->mNumMeshes--;
				continue;
			}

			// allocate the output mesh
			pScene->mMeshes[iNum] = new aiMesh();
			aiMesh* pcMesh = pScene->mMeshes[iNum];

			pcMesh->mNumVertices		= pcSurfaces->NUM_TRIANGLES*3;
			pcMesh->mNumFaces			= pcSurfaces->NUM_TRIANGLES;
			pcMesh->mFaces				= new aiFace[pcSurfaces->NUM_TRIANGLES];
			pcMesh->mNormals			= new aiVector3D[pcMesh->mNumVertices];
			pcMesh->mVertices			= new aiVector3D[pcMesh->mNumVertices];
			pcMesh->mTextureCoords[0]	= new aiVector3D[pcMesh->mNumVertices];
			pcMesh->mNumUVComponents[0] = 2;

			// fill in all triangles
			unsigned int iCurrent = 0;
			for (unsigned int i = 0; i < (unsigned int)pcSurfaces->NUM_TRIANGLES;++i)
			{
				pcMesh->mFaces[i].mIndices = new unsigned int[3];
				pcMesh->mFaces[i].mNumIndices = 3;

				unsigned int iTemp = iCurrent;
				for (unsigned int c = 0; c < 3;++c,++iCurrent)
				{
					// read vertices
					pcMesh->mVertices[iCurrent].x = pcVertices[ pcTriangles->INDEXES[c]].X;
					pcMesh->mVertices[iCurrent].y = pcVertices[ pcTriangles->INDEXES[c]].Y*-1.0f;
					pcMesh->mVertices[iCurrent].z = pcVertices[ pcTriangles->INDEXES[c]].Z;

					// convert the normal vector to uncompressed float3 format
					LatLngNormalToVec3(pcVertices[pcTriangles->INDEXES[c]].NORMAL,
						(float*)&pcMesh->mNormals[iCurrent]);

					pcMesh->mNormals[iCurrent].y *= -1.0f;

					// read texture coordinates
					pcMesh->mTextureCoords[0][iCurrent].x = pcUVs[ pcTriangles->INDEXES[c]].U;
					pcMesh->mTextureCoords[0][iCurrent].y = 1.0f-pcUVs[ pcTriangles->INDEXES[c]].V;
				}
				// FIX: flip the face ordering for use with OpenGL
				pcMesh->mFaces[i].mIndices[0] = iTemp+2;
				pcMesh->mFaces[i].mIndices[1] = iTemp+1;
				pcMesh->mFaces[i].mIndices[2] = iTemp+0;
				pcTriangles++;
			}

			// get the first shader (= texture?) assigned to the surface
			if (0 != pcSurfaces->NUM_SHADER)
			{
				// make a relative path.
				// if the MD3's internal path itself and the given path are using
				// the same directory remove it
				const char* szEndDir1 = ::strrchr((const char*)this->m_pcHeader->NAME,'\\');
				if (!szEndDir1)szEndDir1 = ::strrchr((const char*)this->m_pcHeader->NAME,'/');

				const char* szEndDir2 = ::strrchr((const char*)pcShaders->NAME,'\\');
				if (!szEndDir2)szEndDir2 = ::strrchr((const char*)pcShaders->NAME,'/');

				if (szEndDir1 && szEndDir2)
				{
					// both of them are valid
					const unsigned int iLen1 = (unsigned int)(szEndDir1 - (const char*)this->m_pcHeader->NAME);
					const unsigned int iLen2 = std::min (iLen1, (unsigned int)(szEndDir2 - (const char*)pcShaders->NAME) );

					bool bSuccess = true;
					for (unsigned int a = 0; a  < iLen2;++a)
					{
						char sz = ::tolower ( pcShaders->NAME[a] );
						char sz2 = ::tolower ( this->m_pcHeader->NAME[a] );
						if (sz != sz2)
						{
							bSuccess = false;
							break;
						}
					}
					if (bSuccess)
					{
						// use the file name only
						szEndDir2++;
					}
					else
					{
						// use the full path
						szEndDir2 = (const char*)pcShaders->NAME;
					}
				}

				// now try to find out whether we have this shader already
				bool bHave = false;
				for (unsigned int p = 0; p < iNumMaterials;++p)
				{
					if (iDefaultMatIndex == p)continue;

					aiString szOut;
					if(AI_SUCCESS == aiGetMaterialString ( (aiMaterial*)pScene->mMaterials[p],
						AI_MATKEY_TEXTURE_DIFFUSE(0),&szOut))
					{
						if (0 == ASSIMP_stricmp(szOut.data,szEndDir2))
						{
							// equal. reuse this material (texture)
							bHave = true;
							pcMesh->mMaterialIndex = p;
							break;
						}
					}
				}

				if (!bHave)
				{
					MaterialHelper* pcHelper = new MaterialHelper();

					if (szEndDir2)
					{
						if (szEndDir2[0])
						{
							aiString szString;
							const size_t iLen = ::strlen(szEndDir2);
							::memcpy(szString.data,szEndDir2,iLen);
							szString.data[iLen] = '\0';
							szString.length = iLen;

							pcHelper->AddProperty(&szString,AI_MATKEY_TEXTURE_DIFFUSE(0));
						}
						else 
						{
							DefaultLogger::get()->warn("Texture file name has zero length. "
								"It will be skipped.");
						}
					}

					int iMode = (int)aiShadingMode_Gouraud;
					pcHelper->AddProperty<int>(&iMode, 1, AI_MATKEY_SHADING_MODEL);

					// add a small ambient color value - Quake 3 seems to have one
					aiColor3D clr;
					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);

					pScene->mMaterials[iNumMaterials] = (aiMaterial*)pcHelper;
					pcMesh->mMaterialIndex = iNumMaterials++;
				}
			}
			else
			{
				if (0xFFFFFFFF != iDefaultMatIndex)
				{
					pcMesh->mMaterialIndex = iDefaultMatIndex;
				}
				else
				{
					MaterialHelper* pcHelper = new MaterialHelper();

					// fill in a default material
					int iMode = (int)aiShadingMode_Gouraud;
					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);

					pScene->mMaterials[iNumMaterials] = (aiMaterial*)pcHelper;
					pcMesh->mMaterialIndex = iNumMaterials++;
				}
			}
			// go to the next surface
			pcSurfaces = (const MD3::Surface*)(((unsigned char*)pcSurfaces) + pcSurfaces->OFS_END);
		}

		if (0 == pScene->mNumMeshes)
			throw new ImportErrorException( "Invalid md3 file: File contains no valid mesh");
		pScene->mNumMaterials = iNumMaterials;

		// now we need to generate an empty node graph
		pScene->mRootNode = new aiNode();
		pScene->mRootNode->mNumMeshes = pScene->mNumMeshes;
		pScene->mRootNode->mMeshes = new unsigned int[pScene->mNumMeshes];

		for (unsigned int i = 0; i < pScene->mNumMeshes;++i)
			pScene->mRootNode->mMeshes[i] = i;

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