wxWidgets/utils/glcanvas/samples/cube/cube.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        cube.cpp
// Purpose:     wxGLCanvas demo program
// Author:      Julian Smart
// Modified by:
// Created:     04/01/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:   	wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation
#pragma interface
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif

#include "wx/log.h"

#include "cube.h"

// `Main program' equivalent, creating windows and returning main app frame
bool MyApp::OnInit(void)
{
  wxLog::SetTraceMask(wxTraceMessages);

  // Create the main frame window
  MyFrame *frame = new MyFrame(NULL, "Cube OpenGL Demo", wxPoint(50, 50), wxSize(400, 300));

  // Give it an icon
#ifdef wx_msw
  frame->SetIcon(wxIcon("mondrian"));
#endif

  // Make a menubar
  wxMenu *fileMenu = new wxMenu;

  fileMenu->Append(wxID_EXIT, "E&xit");
  wxMenuBar *menuBar = new wxMenuBar;
  menuBar->Append(fileMenu, "&File");
  frame->SetMenuBar(menuBar);

  frame->m_canvas = new TestGLCanvas(frame, -1, wxPoint(0, 0), wxSize(200, 200));

  // Show the frame
  frame->Show(TRUE);
  
  return TRUE;
}

IMPLEMENT_APP(MyApp)

BEGIN_EVENT_TABLE(MyFrame, wxFrame)
    EVT_MENU(wxID_EXIT, MyFrame::OnExit)
END_EVENT_TABLE()

// My frame constructor
MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
    const wxSize& size, long style):
  wxFrame(frame, -1, title, pos, size, style)
{
    m_canvas = NULL;
}

// Intercept menu commands
void MyFrame::OnExit(wxCommandEvent& event)
{
    Destroy();
}

BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
    EVT_SIZE(TestGLCanvas::OnSize)
    EVT_PAINT(TestGLCanvas::OnPaint)
    EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)
END_EVENT_TABLE()

TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
    const wxPoint& pos, const wxSize& size, long style, const wxString& name):
  wxGLCanvas(parent, id, pos, size, style, name)
{
  m_init = FALSE;
}

TestGLCanvas::~TestGLCanvas(void)
{
}

void TestGLCanvas::OnPaint( wxPaintEvent& event )
{
    // This is a dummy, to avoid an endless succession of paint messages.
    // OnPaint handlers must always create a wxPaintDC.
    wxPaintDC dc(this);

#ifndef __WXMOTIF__
    if (!GetContext()) return;
#endif

    SetCurrent();

    /* init OpenGL once, but after SetCurrent */
    if (!m_init)
    {
       InitGL();
       m_init = TRUE;
    }

    /* clear color and depth buffers */
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    /* draw six faces of a cube */
    glBegin(GL_QUADS);
    glNormal3f( 0.0F, 0.0F, 1.0F);
    glVertex3f( 0.5F, 0.5F, 0.5F); glVertex3f(-0.5F, 0.5F, 0.5F);
    glVertex3f(-0.5F,-0.5F, 0.5F); glVertex3f( 0.5F,-0.5F, 0.5F);

    glNormal3f( 0.0F, 0.0F,-1.0F);
    glVertex3f(-0.5F,-0.5F,-0.5F); glVertex3f(-0.5F, 0.5F,-0.5F);
    glVertex3f( 0.5F, 0.5F,-0.5F); glVertex3f( 0.5F,-0.5F,-0.5F);

    glNormal3f( 0.0F, 1.0F, 0.0F);
    glVertex3f( 0.5F, 0.5F, 0.5F); glVertex3f( 0.5F, 0.5F,-0.5F);
    glVertex3f(-0.5F, 0.5F,-0.5F); glVertex3f(-0.5F, 0.5F, 0.5F);

    glNormal3f( 0.0F,-1.0F, 0.0F);
    glVertex3f(-0.5F,-0.5F,-0.5F); glVertex3f( 0.5F,-0.5F,-0.5F);
    glVertex3f( 0.5F,-0.5F, 0.5F); glVertex3f(-0.5F,-0.5F, 0.5F);

    glNormal3f( 1.0F, 0.0F, 0.0F);
    glVertex3f( 0.5F, 0.5F, 0.5F); glVertex3f( 0.5F,-0.5F, 0.5F);
    glVertex3f( 0.5F,-0.5F,-0.5F); glVertex3f( 0.5F, 0.5F,-0.5F);

    glNormal3f(-1.0F, 0.0F, 0.0F);
    glVertex3f(-0.5F,-0.5F,-0.5F); glVertex3f(-0.5F,-0.5F, 0.5F);
    glVertex3f(-0.5F, 0.5F, 0.5F); glVertex3f(-0.5F, 0.5F,-0.5F);
    glEnd();

    SwapBuffers();
}

void TestGLCanvas::OnSize(wxSizeEvent& event)
{
    int width, height;
    GetClientSize(& width, & height);

#ifndef __WXMOTIF__
    if (GetContext())
#endif
    {
        SetCurrent();
        glViewport(0, 0, width, height);
    }
}

void TestGLCanvas::OnEraseBackground(wxEraseEvent& event)
{
    // Do nothing, to avoid flashing.
}

void TestGLCanvas::InitGL(void)
{
    /* set viewing projection */
    glMatrixMode(GL_PROJECTION);
    glFrustum(-0.5F, 0.5F, -0.5F, 0.5F, 1.0F, 3.0F);

    /* position viewer */
    glMatrixMode(GL_MODELVIEW);
    glTranslatef(0.0F, 0.0F, -2.0F);

    /* position object */
    glRotatef(30.0F, 1.0F, 0.0F, 0.0F);
    glRotatef(30.0F, 0.0F, 1.0F, 0.0F);

    glEnable(GL_DEPTH_TEST);
    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);
}