344 lines
7.9 KiB
C++
344 lines
7.9 KiB
C++
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <ctype.h> /* isspace() */
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#include <string.h> /* strlen() */
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#include <stdlib.h> /* atoi */
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#include <GL/gl.h>
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#include <vector>
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#include <string>
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#include <map>
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#include <iostream>
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#include <fstream>
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#include "WFObj.h"
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using namespace std;
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#define WHITESPACE " \n\r\t\v"
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//#define DEBUGGL
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/****** static functions ******/
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static string trimString(string s)
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{
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size_t lastpos = s.find_last_not_of(WHITESPACE);
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if (lastpos == string::npos)
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return "";
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s.erase(lastpos + 1);
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s.erase(0, s.find_first_not_of(WHITESPACE));
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return s;
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}
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static string stripFirstToken(string & input)
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{
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size_t firstnonspace = input.find_first_not_of(WHITESPACE);
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if (firstnonspace == string::npos)
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return "";
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size_t spaceafter = input.find_first_of(WHITESPACE, firstnonspace);
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string token = input.substr(firstnonspace, spaceafter - firstnonspace);
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input.erase(0, spaceafter);
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return token;
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}
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static vector<string> splitString(const string & str, char delim)
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{
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vector<string> ret;
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string s = str;
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size_t pos;
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while ( (pos = s.find(delim)) != string::npos )
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{
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string t = s.substr(0, pos);
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ret.push_back(t);
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s.erase(0, pos + 1);
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}
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if (s != "")
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ret.push_back(s);
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return ret;
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}
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static string basePath(const string & str)
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{
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string path = str;
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size_t pos;
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if ( (pos = path.find_last_of("/\\")) != string::npos )
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{
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path.erase(pos + 1);
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return path;
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}
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return "";
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}
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//#define DEBUG_GL_ERROR
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#ifdef DEBUG_GL_ERROR
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#define checkGLError() checkGLErrorLine(__FUNCTION__, __LINE__)
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static void checkGLErrorLine(const char * function, int line)
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{
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GLenum err = glGetError();
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if (err != 0)
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{
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cerr << "gl error in " << function
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<< ": " << err << " (0x" << hex << err << ") at line "
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<< dec << line << endl;
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}
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}
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#else
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#define checkGLError()
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#endif
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/****** WFObj functions ******/
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WFObj::WFObj(loadfile_t lf, loadtexture_t lt)
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{
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m_loadfile = lf;
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m_loadtexture = lt;
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if (m_loadfile == NULL)
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{
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m_loadfile = loadfile;
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}
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m_valid = false;
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clear();
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}
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WFObj::~WFObj()
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{
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}
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void WFObj::clear()
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{
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for (int i = 0; i < sizeof(m_vertices)/sizeof(m_vertices[0]); i++)
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m_vertices[i].clear();
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m_faces.clear();
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m_valid = false;
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m_path = "";
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m_current_material_name = "";
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}
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bool WFObj::load(const char *fname)
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{
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clear();
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m_path = fname;
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Buffer buff;
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if (!m_loadfile(fname, &buff))
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return false;
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return load(buff);
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}
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bool WFObj::load(const WFObj::Buffer &buff)
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{
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string buildup;
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size_t idx = 0;
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while (idx < buff.length)
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{
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string line = getLine(buff, idx, &idx);
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string input = trimString(line);
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int sz = input.size();
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if (sz == 0 || input[0] == '#')
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continue;
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if (input[sz-1] == '\\')
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{
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input[sz-1] = ' ';
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buildup += input;
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continue;
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}
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if (buildup != "")
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{
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input = buildup + input;
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buildup = "";
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}
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processInputLine(input);
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}
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return true;
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}
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string WFObj::getLine(const Buffer & buff, size_t idx, size_t *update_idx)
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{
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size_t len = 0;
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while (idx + len < buff.length)
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{
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uint8_t ch = buff.data[idx + len];
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if (ch == 0)
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{
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*update_idx = idx + len + 1;
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break;
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}
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if (ch == '\r' || ch == '\n')
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{
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*update_idx = idx + len + 1;
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uint8_t nextch = buff.data[*update_idx];
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if (ch == '\r' && nextch == '\n')
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(*update_idx)++;
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break;
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}
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len++;
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}
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return string((const char *) &buff.data[idx], len);
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}
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void WFObj::processInputLine(const std::string & input)
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{
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string line = input;
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vector<string> tokens;
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for (;;)
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{
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string token = stripFirstToken(line);
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if (token == "")
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break;
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tokens.push_back(token);
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}
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if (tokens.size() == 0)
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return;
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string type = tokens[0];
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if (type == "v")
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m_vertices[VERTEX].push_back(readVertex(tokens));
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else if (type == "vt")
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m_vertices[VERTEX_TEXTURE].push_back(readVertex(tokens));
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else if (type == "vn")
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m_vertices[VERTEX_NORMAL].push_back(readVertex(tokens));
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else if (type == "f")
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{
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if (m_faces.find(m_current_material_name) == m_faces.end())
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m_faces[m_current_material_name] = vector<Face>();
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vector<Face> faces = readFaces(tokens);
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for (vector<Face>::iterator it = faces.begin(); it != faces.end(); it++)
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m_faces[m_current_material_name].push_back(*it);
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}
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else if (type == "usemtl")
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{
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if (tokens.size() >= 2)
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m_current_material_name = tokens[1];
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}
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else if (type == "mtllib")
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{
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if (tokens.size() >= 2)
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loadMaterial(tokens[1]);
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}
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else if (type == "s")
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{
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/* ignore smoothing */
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}
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else if (type == "g")
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{
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/* ignore group name */
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}
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else
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{
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cerr << "WFObj: warning: unhandled command '" << type << "'" << endl;
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}
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}
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void WFObj::updateAABB()
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{
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bool firstVertex = true;
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for (int i = 0, sz = m_vertices[VERTEX].size(); i < sz; i++)
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{
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Vertex & v = m_vertices[VERTEX][i];
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if (firstVertex)
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{
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m_aabb[0] = m_aabb[3] = v[0];
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m_aabb[1] = m_aabb[4] = v[1];
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m_aabb[2] = m_aabb[5] = v[2];
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firstVertex = false;
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}
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else
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{
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if (v[0] < m_aabb[0])
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m_aabb[0] = v[0];
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else if (v[0] > m_aabb[3])
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m_aabb[3] = v[0];
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if (v[1] < m_aabb[1])
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m_aabb[1] = v[1];
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else if (v[1] > m_aabb[4])
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m_aabb[4] = v[1];
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if (v[2] < m_aabb[2])
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m_aabb[2] = v[2];
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else if (v[2] > m_aabb[5])
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m_aabb[5] = v[2];
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}
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}
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}
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WFObj::Vertex WFObj::readVertex(const vector<string> & parts)
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{
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int partslen = parts.size();
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Vertex v;
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for (int i = 1; i < partslen && i <= 4; i++)
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{
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sscanf(parts[i].c_str(), "%f", &v[i - 1]);
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}
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return v;
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}
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vector<WFObj::Face> WFObj::readFaces(const std::vector<std::string> & parts)
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{
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vector<Face> faces;
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VertexRef refs[4];
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int parts_len = parts.size();
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if (parts_len < 3 || parts_len > 4)
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{
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cerr << "WFObj: error: faces can only have 3 or 4 vertices!" << endl;
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return faces;
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}
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for (int i = 1; i <= parts_len; i++)
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refs[i - 1] = readVertexRef(parts[i]);
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Face f;
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f.vertices[0] = refs[0];
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f.vertices[1] = refs[1];
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f.vertices[2] = refs[2];
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faces.push_back(f);
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if (parts_len == 4)
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{
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f.vertices[0] = refs[2];
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f.vertices[1] = refs[3];
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f.vertices[2] = refs[0];
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faces.push_back(f);
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}
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return faces;
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}
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WFObj::VertexRef WFObj::readVertexRef(const std::string ref)
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{
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vector<string> parts = splitString(ref, '/');
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VertexRef fr;
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for (int i = 0, sz = parts.size(); i < sz; i++)
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{
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string idx_str = trimString(parts[i]);
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if (idx_str.size() > 0)
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{
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int idx = atoi(idx_str.c_str());
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switch (i)
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{
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case 0: fr.vertex = idx; break;
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case 1: fr.texture = idx; break;
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case 2: fr.normal = idx; break;
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}
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}
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}
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return fr;
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}
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void WFObj::loadMaterial(const std::string & name)
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{
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/* TODO */
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}
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bool WFObj::loadfile(const char *path, Buffer *buff)
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{
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/* TODO */
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}
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bool WFObj::VertexRef::operator<(const VertexRef & other)
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{
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if (vertex != other.vertex)
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return vertex < other.vertex;
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if (texture != other.texture)
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return texture < other.texture;
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return normal < other.normal;
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}
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