#include <GL/gl.h>
#include <GL/glu.h>

#include <gdkmm/cursor.h>

#include "SierpinskiDA.h"

SierpinskiDA::SierpinskiDA(const Glib::RefPtr<const Gdk::GL::Config> & config)
    : Gtk::GL::DrawingArea(config)
{
    set_gl_capability(config);
    set_events(Gdk::POINTER_MOTION_MASK
             | Gdk::BUTTON_PRESS_MASK
             | Gdk::BUTTON_RELEASE_MASK
             | Gdk::SCROLL_MASK);
}

void SierpinskiDA::regenerate(int npts)
{
    gl_begin();
    glNewList(m_dl, GL_COMPILE);
    glBegin(GL_QUADS);
    glVertex3f(1, 0, 1);
    glVertex3f(-1, 0, 1);
    glVertex3f(-1, 0, -1);
    glVertex3f(1, 0, -1);
    glEnd();
    glEndList();
    gl_end();
}

bool SierpinskiDA::gl_begin()
{
    Glib::RefPtr<Gdk::GL::Window> glwindow = get_gl_window();
    return glwindow->gl_begin(get_gl_context());
}

void SierpinskiDA::gl_end()
{
    Glib::RefPtr<Gdk::GL::Window> glwindow = get_gl_window();
    glwindow->gl_end();
}

bool SierpinskiDA::draw()
{
    if (!gl_begin())
        return false;

    glClearColor(0.0, 0.0, 0.0, 1.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(0, -2, 0,
              0, 0, 0,
              0, 0, 1);

    glCallList(m_dl);

    if (get_gl_window()->is_double_buffered())
        get_gl_window()->swap_buffers();
    else
        glFlush();

    gl_end();
    return true;
}

bool SierpinskiDA::on_motion_notify_event(GdkEventMotion * event)
{
    get_pointer(m_x, m_y);
    return true;
}

bool SierpinskiDA::on_button_press_event(GdkEventButton * event)
{
    return false;
}

bool SierpinskiDA::on_button_release_event(GdkEventButton * event)
{
    return false;
}

bool SierpinskiDA::on_scroll_event(GdkEventScroll * event)
{
    return false;
}

void SierpinskiDA::on_realize()
{
    Gtk::GL::DrawingArea::on_realize();

    if (gl_begin())
        return;

    glViewport(0, 0, get_width(), get_height());
    m_dl = glGenLists(1);

    gl_end();

    regenerate(10);
}

/*
 * called on widget resizes
 */
bool SierpinskiDA::on_configure_event(GdkEventConfigure * event)
{
    if (gl_begin())
        return false;

    glViewport(0, 0, get_width(), get_height());

    gl_end();

    return true;
}

bool SierpinskiDA::on_expose_event(GdkEventExpose * event)
{
    return draw();
}