OpenGL tutorial 9 functions.cpp

//http://www.youtube.com/user/thecplusplusguy
//Thanks for the typed in code to Tapit85
#include "functions.h"

coordinate::coordinate(float a, float b, float c) {
    x = a;
    y = b;
    z = c;
}

face::face(int facen, int f1, int f2, int f3) {
    facenum = facen;
    faces[0] = f1;
    faces[1] = f2;
    faces[2] = f3;
    four = false;
}

face::face(int facen, int f1, int f2, int f3, int f4) {
    facenum = facen;
    faces[0] = f1;
    faces[1] = f2;
    faces[2] = f3;
    faces[3] = f4;
    four = true;
}

int loadObject(const char* filename)
{
    std::vector<std::string*> coord;
    std::vector<coordinate*> vertex;
    std::vector<face*> faces;
    std::vector<coordinate*> normals;
    std::ifstream in(filename);
    if(!in.is_open())
    {
        std::cout << "Not Opened" << std::endl;
        return -1;
    }
    char buf[256];
    while(!in.eof())
    {
        in.getline(buf, 256);
        coord.push_back(new std::string(buf));
    }

    for(int i = 0; i < coord.size(); i += 1)
    {
        if((*coord[i])[0] == '#')
            continue;
        else if((*coord[i])[0] == 'v' && (*coord[i])[1] == ' ')
        {
            float tmpx, tmpy, tmpz;
            sscanf(coord[i]->c_str(), "v %f %f %f",&tmpx,&tmpy,&tmpz);
            vertex.push_back(new coordinate(tmpx,tmpy,tmpz));
        }
        else if((*coord[i])[0]=='v' && (*coord[i])[1]=='n')
        {
            float tmpx,tmpy,tmpz;
            sscanf(coord[i]->c_str(), "vn %f %f %f",&tmpx,&tmpy,&tmpz);
            normals.push_back(new coordinate(tmpx,tmpy,tmpz));
        }
        else if((*coord[i])[0] == 'f')
        {
            int a,b,c,d,e;
            if(count(coord[i]->begin(), coord[i]->end(), ' ') == 3)
            {
                sscanf(coord[i]->c_str(), "f %d//%d %d//%d %d//%d",&a,&b,&c,&b,&d,&b);
                faces.push_back(new face(b,a,c,d));
            }
            else
            {
                sscanf(coord[i]->c_str(), "f %d//%d %d//%d %d//%d %d//%d",&a,&b,&c,&b,&d,&b,&e,&b);
                faces.push_back(new face(b,a,c,d,e));
            }
        }
    }
    // draw
    int num;
    num = glGenLists(1);
    glNewList(num, GL_COMPILE);
    for(int i = 0; i < faces.size(); i += 1)
    {
        if(faces[i]->four)
        {
            glBegin(GL_QUADS);
                glNormal3f(normals[faces[i]->facenum-1]->x,normals[faces[i]->facenum-1]->y,normals[faces[i]->facenum-1]->z);
                glVertex3f(vertex[faces[i]->faces[0]-1]->x,vertex[faces[i]->faces[0]-1]->y,vertex[faces[i]->faces[0]-1]->z);
                glVertex3f(vertex[faces[i]->faces[1]-1]->x,vertex[faces[i]->faces[1]-1]->y,vertex[faces[i]->faces[1]-1]->z);
                glVertex3f(vertex[faces[i]->faces[2]-1]->x,vertex[faces[i]->faces[2]-1]->y,vertex[faces[i]->faces[2]-1]->z);
                glVertex3f(vertex[faces[i]->faces[3]-1]->x,vertex[faces[i]->faces[3]-1]->y,vertex[faces[i]->faces[3]-1]->z);
            glEnd();
        }
        else
        {
            glBegin(GL_TRIANGLES);
                glNormal3f(normals[faces[i]->facenum-1]->x,normals[faces[i]->facenum-1]->y,normals[faces[i]->facenum-1]->z);
                glVertex3f(vertex[faces[i]->faces[0]-1]->x,vertex[faces[i]->faces[0]-1]->y,vertex[faces[i]->faces[0]-1]->z);
                glVertex3f(vertex[faces[i]->faces[1]-1]->x,vertex[faces[i]->faces[1]-1]->y,vertex[faces[i]->faces[1]-1]->z);
                glVertex3f(vertex[faces[i]->faces[2]-1]->x,vertex[faces[i]->faces[2]-1]->y,vertex[faces[i]->faces[2]-1]->z);
            glEnd();
        }
    }

    glEndList();

    for(int i = 0; i < coord.size(); i += 1)
        delete coord[i];
    for(int i = 0; i < faces.size(); i += 1)
        delete faces[i];
    for(int i = 0; i < normals.size(); i += 1)
        delete normals[i];
    for(int i = 0; i < vertex.size(); i += 1)
        delete vertex[i];

    return num;
}

void drawCube(float size)
{
    glBegin(GL_QUADS);
        // front face
        glColor3f(1.0,0.0,0.0);
        glVertex3f(size/2,size/2,size/2);
        glVertex3f(-size/2,size/2,size/2);
        glVertex3f(-size/2,-size/2,size/2);
        glVertex3f(size/2,-size/2,size/2);
        // left face
        glColor3f(0.0,1.0,0.0);
        glVertex3f(-size/2,size/2,size/2);
        glVertex3f(-size/2,-size/2,size/2);
        glVertex3f(-size/2,-size/2,-size/2);
        glVertex3f(-size/2,size/2,-size/2);
        // back face
        glColor3f(0.0,0.0,1.0);
        glVertex3f(size/2,size/2,-size/2);
        glVertex3f(-size/2,size/2,-size/2);
        glVertex3f(-size/2,-size/2,-size/2);
        glVertex3f(size/2,-size/2,-size/2);
        // right face
        glColor3f(1.0,1.0,0.0);
        glVertex3f(size/2,size/2,size/2);
        glVertex3f(size/2,-size/2,size/2);
        glVertex3f(size/2,-size/2,-size/2);
        glVertex3f(size/2,size/2,-size/2);
        // top face
        glColor3f(1.0,0.0,1.0);
        glVertex3f(size/2,size/2,size/2);
        glVertex3f(-size/2,size/2,size/2);
        glVertex3f(-size/2,size/2,-size/2);
        glVertex3f(size/2,size/2,-size/2);
        // bottom face
        glColor3f(0.0,1.0,1.0);
        glVertex3f(size/2,-size/2,size/2);
        glVertex3f(-size/2,-size/2,size/2);
        glVertex3f(-size/2,-size/2,-size/2);
        glVertex3f(size/2,-size/2,-size/2);
    glEnd();
}