#include "GlWindow.h"
#include <GL/glu.h>
#include <iostream>
using namespace std;

GlWindow::GlWindow(int width, int height, char *title):
    Fl_Gl_Window(width, height, title), _height(height),
    _width(width)
{
        mode(FL_RGB | FL_ALPHA | FL_DEPTH |FL_DOUBLE);
        size_range(0,0,_width,_height);
}

GlWindow::~GlWindow(void){}

void GlWindow::initialiseGL(void){
    glClearColor(.1f, .1f, .1f, 1);
    glEnable(GL_DEPTH_TEST);
}

void GlWindow::draw(){
    static bool firstTime = true;
    if (firstTime){
        initialiseGL();
        firstTime = false;
    }

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glFrustum(-1, 1, -1, 1, 1, 100);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(0,0,3,0,0,0,0,1,0);
    DrawCube();
}


void GlWindow::DrawCube()
{
    glBegin(GL_QUADS);
    glColor3f(1, 0, 0);
    glVertex3f(-1, 1, 1);
    glVertex3f(-1, -1, 1);
    glVertex3f(1, -1, 1);
    glVertex3f(1, 1, 1);

    // back
    glColor3f(0, 1, 0);
    glVertex3f(-1, 1, -1);
    glVertex3f(1, 1, -1);
    glVertex3f(1, -1, -1);
    glVertex3f(-1, -1, -1);

    // top
    glColor3f(0, 0, 1);
    glVertex3f(-1, 1, -1);
    glVertex3f(-1, 1, 1);
    glVertex3f(1, 1, 1);
    glVertex3f(1, 1, -1);

    // bottom
    glColor3f(1, 1, 0);
    glVertex3f(-1, -1, -1);
    glVertex3f(1, -1, -1);
    glVertex3f(1, -1, 1);
    glVertex3f(-1, -1, 1);

    // left
    glColor3f(0, 1, 1);
    glVertex3f(-1, 1, -1);
    glVertex3f(-1, -1, -1);
    glVertex3f(-1, -1, 1);
    glVertex3f(-1, 1, 1);

    // right
    glColor3f(1, 0, 1);
    glVertex3f(1, 1, 1);
    glVertex3f(1, -1, 1);
    glVertex3f(1, -1, -1);
    glVertex3f(1, 1, -1);
    glEnd();
}

int main(int argc, char **argv){
    //Fl_Gl_Window win(0,0,400, 400);
    //Fl_Scroll scroll(0,0,400,400);
    GlWindow myWindow(400, 400, "moo");
    myWindow.resizable(&myWindow);
    //win.resizable(&myWindow);
    //scroll.end();
    //win.end();
    //win.show();
    myWindow.show();
    Fl::run();
    return 0;
}