71fa1b508e
- wrote some further documentation text - moved ObjFileParser.h to the code directory git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@23 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
542 lines
14 KiB
C++
542 lines
14 KiB
C++
#include "ObjFileParser.h"
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#include "ObjTools.h"
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#include "ObjFileData.h"
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#include "DefaultIOSystem.h"
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#include "../include/IOStream.h"
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#include "../include/aiTypes.h"
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#include "../include/aiAssert.h"
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#include "fast_atof.h"
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#include <iostream>
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#include <vector>
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#include <cassert>
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namespace Assimp
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{
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// -------------------------------------------------------------------
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ObjFileParser::ObjFileParser(std::vector<char> &Data, const std::string &strAbsPath, const std::string &strModelName) :
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m_strAbsPath(strAbsPath),
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m_DataIt(Data.begin()),
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m_DataItEnd(Data.end()),
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m_pModel(NULL),
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m_uiLine(0)
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{
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// Create the model instance to store all the data
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m_pModel = new ObjFile::Model();
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m_pModel->m_ModelName = strModelName;
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// Start parsing the file
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parseFile();
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}
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// -------------------------------------------------------------------
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ObjFileParser::~ObjFileParser()
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{
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// empty
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}
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// -------------------------------------------------------------------
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ObjFile::Model *ObjFileParser::GetModel() const
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{
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return m_pModel;
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}
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// -------------------------------------------------------------------
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void ObjFileParser::parseFile()
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{
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if (m_DataIt == m_DataItEnd)
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return;
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while (m_DataIt != m_DataItEnd)
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{
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switch (*m_DataIt)
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{
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case 'v': // Parse a vertex texture coordinate
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{
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++m_DataIt;
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if (*m_DataIt == ' ')
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{
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// Read in vertex definition
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getVector3(m_pModel->m_Vertices);
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}
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else if (*m_DataIt == 't')
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{
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// Read in texture coordinate (2D)
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getVector2(m_pModel->m_TextureCoord);
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}
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else if (*m_DataIt == 'n')
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{
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// Read in normal vector definition
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getVector3(m_pModel->m_Normals);
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}
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}
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break;
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case 'f': // Parse a face
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{
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getFace();
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}
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break;
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case '#': // Parse a comment
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{
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getComment();
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}
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break;
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case 'u': // Parse a material desc. setter
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{
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getMaterialDesc();
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}
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break;
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case 'm': // Parse a material library
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{
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getMaterialLib();
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}
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break;
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case 'g': // Parse group name
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{
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getGroupName();
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}
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break;
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case 's': // Parse group number
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{
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getGroupNumber();
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}
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break;
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case 'o': // Parse object name
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{
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getObjectName();
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}
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break;
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default:
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{
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m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
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}
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break;
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}
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}
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}
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// -------------------------------------------------------------------
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// Copy the next word in a temporary buffer
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void ObjFileParser::copyNextWord(char *pBuffer, size_t length)
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{
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size_t index = 0;
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m_DataIt = getNextWord<DataArrayIt>(m_DataIt, m_DataItEnd);
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while (!isSpace(*m_DataIt) && m_DataIt != m_DataItEnd)
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{
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pBuffer[index] = *m_DataIt;
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index++;
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if (index == length-1)
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break;
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++m_DataIt;
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}
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pBuffer[index] = '\0';
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}
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// -------------------------------------------------------------------
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// Copy the next line into a temporary buffer
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void ObjFileParser::copyNextLine(char *pBuffer, size_t length)
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{
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size_t index = 0;
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while (m_DataIt != m_DataItEnd)
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{
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if (*m_DataIt == '\n' || *m_DataIt == '\r')
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break;
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assert (index+1 <= length);
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pBuffer[ index ] = *m_DataIt;
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++index;
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++m_DataIt;
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}
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pBuffer[ index ] = '\0';
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}
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// -------------------------------------------------------------------
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// Get values for a new 3D vector instance
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void ObjFileParser::getVector3(std::vector<aiVector3D*> &point3d_array)
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{
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float x, y, z;
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copyNextWord(m_buffer, BUFFERSIZE);
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x = (float) fast_atof(m_buffer);
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copyNextWord(m_buffer, BUFFERSIZE);
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y = (float) fast_atof(m_buffer);
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copyNextWord(m_buffer, BUFFERSIZE);
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z = (float) fast_atof(m_buffer);
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point3d_array.push_back(new aiVector3D(x,y,z));
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//skipLine();
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m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
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}
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// -------------------------------------------------------------------
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// Get values for a new 2D vector instance
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void ObjFileParser::getVector2( std::vector<aiVector2D*> &point2d_array )
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{
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float x, y;
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copyNextWord(m_buffer, BUFFERSIZE);
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x = (float) fast_atof(m_buffer);
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copyNextWord(m_buffer, BUFFERSIZE);
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y = (float) fast_atof(m_buffer);
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point2d_array.push_back(new aiVector2D(x, y));
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m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
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}
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// -------------------------------------------------------------------
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// Get values for a new face instance
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void ObjFileParser::getFace()
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{
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copyNextLine(m_buffer, BUFFERSIZE);
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if (m_DataIt == m_DataItEnd)
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return;
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char *pPtr = m_buffer;
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char *pEnd = &pPtr[BUFFERSIZE];
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pPtr = getNextToken<char*>(pPtr, pEnd);
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if (pPtr == '\0')
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return;
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std::vector<unsigned int> *pIndices = new std::vector<unsigned int>;
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std::vector<unsigned int> *pTexID = new std::vector<unsigned int>;
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std::vector<unsigned int> *pNormalID = new std::vector<unsigned int>;
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bool vt = (!m_pModel->m_TextureCoord.empty());
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bool vn = (!m_pModel->m_Normals.empty());
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int iStep = 0, iPos = 0;
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while (pPtr != pEnd)
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{
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iStep = 1;
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if (*pPtr == '\0')
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break;
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if (*pPtr=='\r')
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break;
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if (*pPtr=='/' )
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{
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if (iPos == 0)
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{
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//if there are no texturecoordinates in the obj file but normals
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if (!vt && vn)
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iPos = 1;
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}
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iPos++;
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}
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else if (isSpace(*pPtr))
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{
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iPos = 0;
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}
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else
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{
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//OBJ USES 1 Base ARRAYS!!!!
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const int iVal = atoi(pPtr);
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int tmp = iVal;
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while ((tmp = tmp / 10)!=0)
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++iStep;
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if (0 != iVal)
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{
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// Store parsed index
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if (0 == iPos)
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{
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pIndices->push_back(iVal-1);
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}
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else if (1 == iPos)
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{
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pTexID->push_back(iVal-1);
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}
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else if (2 == iPos)
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{
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pNormalID->push_back(iVal-1);
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}
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else
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{
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reportErrorTokenInFace();
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}
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}
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}
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for (int i=0; i<iStep; i++)
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++pPtr;
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}
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ObjFile::Face *face = new ObjFile::Face(pIndices, pNormalID, pTexID);
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// Set active material, if one set
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if (NULL != m_pModel->m_pCurrentMaterial)
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face->m_pMaterial = m_pModel->m_pCurrentMaterial;
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else
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face->m_pMaterial = m_pModel->m_pDefaultMaterial;
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// Create a default object, if nothing there
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if (NULL == m_pModel->m_pCurrent)
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createObject("defaultobject");
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// Store the new instance
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m_pModel->m_pCurrent->m_Faces.push_back(face);
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// Skip the rest of the line
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m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
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}
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// -------------------------------------------------------------------
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// Get values for a new material description
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void ObjFileParser::getMaterialDesc()
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{
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// Get next data for material data
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m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
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if (m_DataIt == m_DataItEnd)
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return;
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char *pStart = &(*m_DataIt);
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while (!isSpace(*m_DataIt) && m_DataIt != m_DataItEnd)
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m_DataIt++;
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// Get name
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std::string strName(pStart, &(*m_DataIt));
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if (strName.empty())
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return;
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// Search for material
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std::string strFile;
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std::map<std::string, ObjFile::Material*>::iterator it = m_pModel->m_MaterialMap.find( strName );
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if (it == m_pModel->m_MaterialMap.end())
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{
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m_pModel->m_pCurrentMaterial = new ObjFile::Material();
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m_pModel->m_MaterialMap[ strName ] = m_pModel->m_pCurrentMaterial;
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}
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m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
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}
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// -------------------------------------------------------------------
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// Get a comment, values will be skipped
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void ObjFileParser::getComment()
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{
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while (true)
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{
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if ('\n' == (*m_DataIt) || m_DataIt == m_DataItEnd)
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{
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++m_DataIt;
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break;
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}
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else
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{
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++m_DataIt;
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}
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}
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}
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// -------------------------------------------------------------------
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//
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void ObjFileParser::getMaterialLib()
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{
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// Translate tuple
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m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
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if (m_DataIt == m_DataItEnd)
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return;
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char *pStart = &(*m_DataIt);
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while (!isSpace(*m_DataIt))
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m_DataIt++;
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// Check for existence
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DefaultIOSystem IOSystem;
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std::string strMatName(pStart, &(*m_DataIt));
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std::string absName = m_strAbsPath + IOSystem.getOsSeparator() + strMatName;
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if (!IOSystem.Exists(absName))
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{
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m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
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return;
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}
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std::string strExt("");
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extractExtension(strMatName, strExt);
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std::string mat = "mtl";
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DefaultIOSystem FileSystem;
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IOStream *pFile = FileSystem.Open(absName);
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if (0L != pFile)
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{
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size_t size = pFile->FileSize();
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std::vector<char> buffer;
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buffer.resize( size );
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size_t read_size = pFile->Read( &buffer[ 0 ], sizeof(char), size );
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FileSystem.Close( pFile );
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// TODO: Load mtl file
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}
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// Load material library (all materials will be created)
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m_pModel->m_MaterialLib.push_back(strMatName);
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m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
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}
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// -------------------------------------------------------------------
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//
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void ObjFileParser::getNewMaterial()
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{
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m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
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m_DataIt = getNextWord<DataArrayIt>(m_DataIt, m_DataItEnd);
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char *pStart = &(*m_DataIt);
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std::string strMat(pStart, *m_DataIt);
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while (isSpace(*m_DataIt))
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m_DataIt++;
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std::map<std::string, ObjFile::Material*>::iterator it = m_pModel->m_MaterialMap.find(strMat);
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if (it == m_pModel->m_MaterialMap.end())
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{
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// Show a warning, if material was not found
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std::string strWarn ("Unsupported material requested: ");
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strWarn += strMat;
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std::cerr << "Warning : " << strWarn << std::endl;
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m_pModel->m_pCurrentMaterial = m_pModel->m_pDefaultMaterial;
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}
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else
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{
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// Set new material
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m_pModel->m_pCurrentMaterial = (*it).second;
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}
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m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
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}
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// -------------------------------------------------------------------
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//
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void ObjFileParser::getGroupName()
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{
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// Get next word from data buffer
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m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
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m_DataIt = getNextWord<DataArrayIt>(m_DataIt, m_DataItEnd);
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// Store groupname in group library
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char *pStart = &(*m_DataIt);
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while (!isSpace(*m_DataIt))
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m_DataIt++;
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std::string strGroupName(pStart, &(*m_DataIt));
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// Change active group, if necessary
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if (m_pModel->m_strActiveGroup != strGroupName)
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{
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// Search for already existing entry
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ObjFile::Model::ConstGroupMapIt it = m_pModel->m_Groups.find(&strGroupName);
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// New group name, creating a new entry
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ObjFile::Object *pObject = m_pModel->m_pCurrent;
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if (it == m_pModel->m_Groups.end())
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{
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std::vector<unsigned int> *pFaceIDArray = new std::vector<unsigned int>;
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m_pModel->m_Groups[ &strGroupName ] = pFaceIDArray;
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m_pModel->m_pGroupFaceIDs = (pFaceIDArray);
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}
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else
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{
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m_pModel->m_pGroupFaceIDs = (*it).second;
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}
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m_pModel->m_strActiveGroup = strGroupName;
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}
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m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
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}
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// -------------------------------------------------------------------
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// Not supported
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void ObjFileParser::getGroupNumber()
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{
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// Not used
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m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
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}
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// -------------------------------------------------------------------
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// Stores values for a new object instance, name will be used to
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// identify it.
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void ObjFileParser::getObjectName()
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{
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m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
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if (m_DataIt == m_DataItEnd)
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return;
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char *pStart = &(*m_DataIt);
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while (!isSpace(*m_DataIt))
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m_DataIt++;
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std::string strObjectName(pStart, &(*m_DataIt));
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if (!strObjectName.empty())
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{
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// Reset current object
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m_pModel->m_pCurrent = NULL;
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// Search for actual object
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for (std::vector<ObjFile::Object*>::const_iterator it = m_pModel->m_Objects.begin();
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it != m_pModel->m_Objects.end();
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++it)
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{
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if ((*it)->m_strObjName == strObjectName)
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{
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m_pModel->m_pCurrent = *it;
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break;
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}
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}
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// Allocate a new object, if current one wasn´t found before
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if (m_pModel->m_pCurrent == NULL)
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{
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createObject(strObjectName);
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/*m_pModel->m_pCurrent = new ObjFile::Object();
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m_pModel->m_pCurrent->m_strObjName = strObjectName;
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m_pModel->m_Objects.push_back(m_pModel->m_pCurrent);*/
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}
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}
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m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
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}
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// -------------------------------------------------------------------
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// Creates a new object instance
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void ObjFileParser::createObject(const std::string &strObjectName)
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{
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ai_assert (NULL != m_pModel);
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ai_assert (!strObjectName.empty());
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m_pModel->m_pCurrent = new ObjFile::Object();
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m_pModel->m_pCurrent->m_strObjName = strObjectName;
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m_pModel->m_Objects.push_back(m_pModel->m_pCurrent);
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}
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// -------------------------------------------------------------------
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// Shows an error in parsing process.
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void ObjFileParser::reportErrorTokenInFace()
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{
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std::string strErr("");
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m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
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std::cerr << "Not supported token in face desc. detected : " << strErr << std::endl;
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}
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// -------------------------------------------------------------------
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// Extracts the extention from a filename
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void ObjFileParser::extractExtension(const std::string strFile,
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std::string &strExt)
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{
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strExt = "";
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if (strFile.empty())
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return;
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std::string::size_type pos = strFile.find_last_of(".");
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if (pos == std::string::npos)
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return;
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strExt = strFile.substr(pos, strFile.size() - pos);
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}
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// -------------------------------------------------------------------
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} // Namespace Assimp
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