samples/opengl/cube/cube.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        cube.cpp
   3 // Purpose:     wxGLCanvas demo program
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16 #pragma hdrstop
  17 #endif
  18
  19 #ifndef WX_PRECOMP
  20 #include "wx/wx.h"
  21 #endif
  22
  23 #if !wxUSE_GLCANVAS
  24     #error "OpenGL required: set wxUSE_GLCANVAS to 1 and rebuild the library"
  25 #endif
  26
  27 #include "cube.h"
  28 #include "../../sample.xpm"
  29
  30 #ifndef __WXMSW__     // for StopWatch, see remark below
  31   #if defined(__WXMAC__) && !defined(__DARWIN__)
  32     #include <utime.h>
  33     #include <unistd.h>
  34   #else
  35     #include <sys/time.h>
  36     #include <sys/unistd.h>
  37   #endif
  38 #else
  39 #include <sys/timeb.h>
  40 #endif
  41
  42 #define ID_NEW_WINDOW 10000
  43 #define ID_DEF_ROTATE_LEFT_KEY 10001
  44 #define ID_DEF_ROTATE_RIGHT_KEY 10002
  45
  46 /*----------------------------------------------------------
  47   Control to get a keycode
  48   ----------------------------------------------------------*/
  49 class ScanCodeCtrl : public wxTextCtrl
  50 {
  51 public:
  52     ScanCodeCtrl( wxWindow* parent, wxWindowID id, int code,
  53         const wxPoint& pos, const wxSize& size );
  54
  55     void OnChar( wxKeyEvent& WXUNUSED(event) )
  56     {
  57         // Do nothing
  58     }
  59
  60     void OnKeyDown(wxKeyEvent& event);
  61
  62 private:
  63
  64     // Any class wishing to process wxWidgets events must use this macro
  65     DECLARE_EVENT_TABLE()
  66 };
  67
  68 BEGIN_EVENT_TABLE( ScanCodeCtrl, wxTextCtrl )
  69     EVT_CHAR( ScanCodeCtrl::OnChar )
  70     EVT_KEY_DOWN( ScanCodeCtrl::OnKeyDown )
  71 END_EVENT_TABLE()
  72
  73 ScanCodeCtrl::ScanCodeCtrl( wxWindow* parent, wxWindowID id, int code,
  74     const wxPoint& pos, const wxSize& size )
  75     : wxTextCtrl( parent, id, wxEmptyString, pos, size )
  76 {
  77     SetValue( wxString::Format(wxT("0x%04x"), code) );
  78 }
  79
  80 void ScanCodeCtrl::OnKeyDown( wxKeyEvent& event )
  81 {
  82     SetValue( wxString::Format(wxT("0x%04x"), event.GetKeyCode()) );
  83 }
  84
  85 /*------------------------------------------------------------------
  86  Dialog for defining a keypress
  87 -------------------------------------------------------------------*/
  88
  89 class ScanCodeDialog : public wxDialog
  90 {
  91 public:
  92     ScanCodeDialog( wxWindow* parent, wxWindowID id, const int code,
  93         const wxString &descr, const wxString& title );
  94     int GetValue();
  95
  96 private:
  97
  98     ScanCodeCtrl       *m_ScanCode;
  99     wxTextCtrl         *m_Description;
 100 };
 101
 102 ScanCodeDialog::ScanCodeDialog( wxWindow* parent, wxWindowID id,
 103     const int code, const wxString &descr, const wxString& title )
 104     : wxDialog( parent, id, title, wxDefaultPosition, wxSize(96*2,76*2) )
 105 {
 106     new wxStaticText( this, wxID_ANY, _T("Scancode"), wxPoint(4*2,3*2),
 107         wxSize(31*2,12*2) );
 108     m_ScanCode = new ScanCodeCtrl( this, wxID_ANY, code, wxPoint(37*2,6*2),
 109         wxSize(53*2,14*2) );
 110
 111     new wxStaticText( this, wxID_ANY, _T("Description"), wxPoint(4*2,24*2),
 112         wxSize(32*2,12*2) );
 113     m_Description = new wxTextCtrl( this, wxID_ANY, descr, wxPoint(37*2,27*2),
 114         wxSize(53*2,14*2) );
 115
 116     new wxButton( this, wxID_OK, _T("Ok"), wxPoint(20*2,50*2), wxSize(20*2,13*2) );
 117     new wxButton( this, wxID_CANCEL, _T("Cancel"), wxPoint(44*2,50*2),
 118         wxSize(25*2,13*2) );
 119 }
 120
 121 int ScanCodeDialog::GetValue()
 122 {
 123     int code;
 124     wxString buf = m_ScanCode->GetValue();
 125     wxSscanf( buf.c_str(), _T("%i"), &code );
 126     return code;
 127 }
 128
 129 /*----------------------------------------------------------------------
 130   Utility function to get the elapsed time (in msec) since a given point
 131   in time (in sec)  (because current version of wxGetElapsedTime doesn´t
 132   works right with glibc-2.1 and linux, at least for me)
 133 -----------------------------------------------------------------------*/
 134 unsigned long StopWatch( unsigned long *sec_base )
 135 {
 136   unsigned long secs,msec;
 137
 138 #if defined(__WXMSW__)
 139   struct timeb tb;
 140   ftime( &tb );
 141   secs = tb.time;
 142   msec = tb.millitm;
 143 #elif defined(__WXMAC__) && !defined(__DARWIN__)
 144   wxLongLong tl = wxGetLocalTimeMillis();
 145   secs = (unsigned long) (tl.GetValue() / 1000);
 146   msec = (unsigned long) (tl.GetValue() - secs*1000);
 147 #else
 148   // think every unice has gettimeofday
 149   struct timeval tv;
 150   gettimeofday( &tv, (struct timezone *)NULL );
 151   secs = tv.tv_sec;
 152   msec = tv.tv_usec/1000;
 153 #endif
 154
 155   if( *sec_base == 0 )
 156     *sec_base = secs;
 157
 158   return( (secs-*sec_base)*1000 + msec );
 159 }
 160
 161 /*----------------------------------------------------------------
 162   Implementation of Test-GLCanvas
 163 -----------------------------------------------------------------*/
 164
 165 BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
 166     EVT_SIZE(TestGLCanvas::OnSize)
 167     EVT_PAINT(TestGLCanvas::OnPaint)
 168     EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)
 169     EVT_KEY_DOWN( TestGLCanvas::OnKeyDown )
 170     EVT_KEY_UP( TestGLCanvas::OnKeyUp )
 171     EVT_ENTER_WINDOW( TestGLCanvas::OnEnterWindow )
 172 END_EVENT_TABLE()
 173
 174 unsigned long  TestGLCanvas::m_secbase = 0;
 175 int            TestGLCanvas::m_TimeInitialized = 0;
 176 unsigned long  TestGLCanvas::m_xsynct;
 177 unsigned long  TestGLCanvas::m_gsynct;
 178
 179 TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
 180     const wxPoint& pos, const wxSize& size, long style, const wxString& name)
 181     : wxGLCanvas(parent, (wxGLCanvas*) NULL, id, pos, size, style|wxFULL_REPAINT_ON_RESIZE , name )
 182 {
 183     m_init = false;
 184     m_gllist = 0;
 185     m_rleft = WXK_LEFT;
 186     m_rright = WXK_RIGHT;
 187 }
 188
 189 TestGLCanvas::TestGLCanvas(wxWindow *parent, const TestGLCanvas *other,
 190     wxWindowID id, const wxPoint& pos, const wxSize& size, long style,
 191     const wxString& name )
 192     : wxGLCanvas(parent, other->GetContext(), id, pos, size, style|wxFULL_REPAINT_ON_RESIZE , name)
 193 {
 194     m_init = false;
 195     m_gllist = other->m_gllist; // share display list
 196     m_rleft = WXK_LEFT;
 197     m_rright = WXK_RIGHT;
 198 }
 199
 200 TestGLCanvas::~TestGLCanvas()
 201 {
 202 }
 203
 204 void TestGLCanvas::Render()
 205 {
 206     wxPaintDC dc(this);
 207
 208 #ifndef __WXMOTIF__
 209     if (!GetContext()) return;
 210 #endif
 211
 212     SetCurrent();
 213     // Init OpenGL once, but after SetCurrent
 214     if (!m_init)
 215     {
 216         InitGL();
 217         m_init = true;
 218     }
 219
 220     glMatrixMode(GL_PROJECTION);
 221     glLoadIdentity();
 222     glFrustum(-0.5f, 0.5f, -0.5f, 0.5f, 1.0f, 3.0f);
 223     glMatrixMode(GL_MODELVIEW);
 224
 225     /* clear color and depth buffers */
 226     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 227
 228     if( m_gllist == 0 )
 229     {
 230         m_gllist = glGenLists( 1 );
 231         glNewList( m_gllist, GL_COMPILE_AND_EXECUTE );
 232         /* draw six faces of a cube */
 233         glBegin(GL_QUADS);
 234         glNormal3f( 0.0f, 0.0f, 1.0f);
 235         glVertex3f( 0.5f, 0.5f, 0.5f); glVertex3f(-0.5f, 0.5f, 0.5f);
 236         glVertex3f(-0.5f,-0.5f, 0.5f); glVertex3f( 0.5f,-0.5f, 0.5f);
 237
 238         glNormal3f( 0.0f, 0.0f,-1.0f);
 239         glVertex3f(-0.5f,-0.5f,-0.5f); glVertex3f(-0.5f, 0.5f,-0.5f);
 240         glVertex3f( 0.5f, 0.5f,-0.5f); glVertex3f( 0.5f,-0.5f,-0.5f);
 241
 242         glNormal3f( 0.0f, 1.0f, 0.0f);
 243         glVertex3f( 0.5f, 0.5f, 0.5f); glVertex3f( 0.5f, 0.5f,-0.5f);
 244         glVertex3f(-0.5f, 0.5f,-0.5f); glVertex3f(-0.5f, 0.5f, 0.5f);
 245
 246         glNormal3f( 0.0f,-1.0f, 0.0f);
 247         glVertex3f(-0.5f,-0.5f,-0.5f); glVertex3f( 0.5f,-0.5f,-0.5f);
 248         glVertex3f( 0.5f,-0.5f, 0.5f); glVertex3f(-0.5f,-0.5f, 0.5f);
 249
 250         glNormal3f( 1.0f, 0.0f, 0.0f);
 251         glVertex3f( 0.5f, 0.5f, 0.5f); glVertex3f( 0.5f,-0.5f, 0.5f);
 252         glVertex3f( 0.5f,-0.5f,-0.5f); glVertex3f( 0.5f, 0.5f,-0.5f);
 253
 254         glNormal3f(-1.0f, 0.0f, 0.0f);
 255         glVertex3f(-0.5f,-0.5f,-0.5f); glVertex3f(-0.5f,-0.5f, 0.5f);
 256         glVertex3f(-0.5f, 0.5f, 0.5f); glVertex3f(-0.5f, 0.5f,-0.5f);
 257         glEnd();
 258
 259         glEndList();
 260     }
 261     else
 262     {
 263         glCallList(m_gllist);
 264     }
 265
 266     glFlush();
 267     SwapBuffers();
 268 }
 269
 270 void TestGLCanvas::OnEnterWindow( wxMouseEvent& WXUNUSED(event) )
 271 {
 272     SetFocus();
 273 }
 274
 275 void TestGLCanvas::OnPaint( wxPaintEvent& WXUNUSED(event) )
 276 {
 277     Render();
 278 }
 279
 280 void TestGLCanvas::OnSize(wxSizeEvent& event)
 281 {
 282     // this is also necessary to update the context on some platforms
 283     wxGLCanvas::OnSize(event);
 284
 285     // set GL viewport (not called by wxGLCanvas::OnSize on all platforms...)
 286     int w, h;
 287     GetClientSize(&w, &h);
 288 #ifndef __WXMOTIF__
 289     if (GetContext())
 290 #endif
 291     {
 292         SetCurrent();
 293         glViewport(0, 0, (GLint) w, (GLint) h);
 294     }
 295 }
 296
 297 void TestGLCanvas::OnEraseBackground(wxEraseEvent& WXUNUSED(event))
 298 {
 299   // Do nothing, to avoid flashing.
 300 }
 301
 302 void TestGLCanvas::InitGL()
 303 {
 304     SetCurrent();
 305
 306     /* set viewing projection */
 307     glMatrixMode(GL_PROJECTION);
 308     glFrustum(-0.5f, 0.5f, -0.5f, 0.5f, 1.0f, 3.0f);
 309
 310     /* position viewer */
 311     glMatrixMode(GL_MODELVIEW);
 312     glTranslatef(0.0f, 0.0f, -2.0f);
 313
 314     /* position object */
 315     glRotatef(30.0f, 1.0f, 0.0f, 0.0f);
 316     glRotatef(30.0f, 0.0f, 1.0f, 0.0f);
 317
 318     glEnable(GL_DEPTH_TEST);
 319     glEnable(GL_LIGHTING);
 320     glEnable(GL_LIGHT0);
 321 }
 322
 323 GLfloat TestGLCanvas::CalcRotateSpeed( unsigned long acceltime )
 324 {
 325   GLfloat t,v;
 326
 327   t = ((GLfloat)acceltime) / 1000.0f;
 328
 329   if( t < 0.5f )
 330     v = t;
 331   else if( t < 1.0f )
 332     v = t * (2.0f - t);
 333   else
 334     v = 0.75f;
 335
 336   return(v);
 337 }
 338
 339 GLfloat TestGLCanvas::CalcRotateAngle( unsigned long lasttime,
 340                                   unsigned long acceltime )
 341 {
 342     GLfloat t,s1,s2;
 343
 344     t = ((GLfloat)(acceltime - lasttime)) / 1000.0f;
 345     s1 = CalcRotateSpeed( lasttime );
 346     s2 = CalcRotateSpeed( acceltime );
 347
 348     return( t * (s1 + s2) * 135.0f );
 349 }
 350
 351 void TestGLCanvas::Action( long code, unsigned long lasttime,
 352                            unsigned long acceltime )
 353 {
 354     GLfloat angle = CalcRotateAngle( lasttime, acceltime );
 355
 356     if (code == m_rleft)
 357         Rotate( angle );
 358     else if (code == m_rright)
 359             Rotate( -angle );
 360 }
 361
 362 void TestGLCanvas::OnKeyDown( wxKeyEvent& event )
 363 {
 364     long evkey = event.GetKeyCode();
 365     if (evkey == 0) return;
 366
 367     if (!m_TimeInitialized)
 368     {
 369         m_TimeInitialized = 1;
 370         m_xsynct = event.GetTimestamp();
 371         m_gsynct = StopWatch(&m_secbase);
 372
 373         m_Key = evkey;
 374         m_StartTime = 0;
 375         m_LastTime = 0;
 376         m_LastRedraw = 0;
 377     }
 378
 379     unsigned long currTime = event.GetTimestamp() - m_xsynct;
 380
 381     if (evkey != m_Key)
 382     {
 383         m_Key = evkey;
 384         m_LastRedraw = m_StartTime = m_LastTime = currTime;
 385     }
 386
 387     if (currTime >= m_LastRedraw)      // Redraw:
 388     {
 389         Action( m_Key, m_LastTime-m_StartTime, currTime-m_StartTime );
 390
 391 #if defined(__WXMAC__) && !defined(__DARWIN__)
 392         m_LastRedraw = currTime;    // StopWatch() doesn't work on Mac...
 393 #else
 394         m_LastRedraw = StopWatch(&m_secbase) - m_gsynct;
 395 #endif
 396         m_LastTime = currTime;
 397     }
 398
 399     event.Skip();
 400 }
 401
 402 void TestGLCanvas::OnKeyUp( wxKeyEvent& event )
 403 {
 404     m_Key = 0;
 405     m_StartTime = 0;
 406     m_LastTime = 0;
 407     m_LastRedraw = 0;
 408
 409     event.Skip();
 410 }
 411
 412 void TestGLCanvas::Rotate( GLfloat deg )
 413 {
 414     SetCurrent();
 415
 416     glMatrixMode(GL_MODELVIEW);
 417     glRotatef((GLfloat)deg, 0.0f, 0.0f, 1.0f);
 418     Refresh(false);
 419 }
 420
 421
 422 /* -----------------------------------------------------------------------
 423   Main Window
 424 -------------------------------------------------------------------------*/
 425
 426 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 427     EVT_MENU(wxID_EXIT, MyFrame::OnExit)
 428     EVT_MENU( ID_NEW_WINDOW, MyFrame::OnNewWindow)
 429     EVT_MENU( ID_DEF_ROTATE_LEFT_KEY, MyFrame::OnDefRotateLeftKey)
 430     EVT_MENU( ID_DEF_ROTATE_RIGHT_KEY, MyFrame::OnDefRotateRightKey)
 431 END_EVENT_TABLE()
 432
 433 // My frame constructor
 434 MyFrame::MyFrame(wxWindow *parent, const wxString& title, const wxPoint& pos,
 435     const wxSize& size, long style)
 436     : wxFrame(parent, wxID_ANY, title, pos, size, style)
 437 {
 438     m_canvas = NULL;
 439     SetIcon(wxIcon(sample_xpm));
 440 }
 441
 442 // Intercept menu commands
 443 void MyFrame::OnExit( wxCommandEvent& WXUNUSED(event) )
 444 {
 445     // true is to force the frame to close
 446     Close(true);
 447 }
 448
 449 /*static*/ MyFrame *MyFrame::Create(MyFrame *parentFrame, bool isCloneWindow)
 450 {
 451     wxString str = wxT("wxWidgets OpenGL Cube Sample");
 452     if (isCloneWindow) str += wxT(" - Clone");
 453
 454     MyFrame *frame = new MyFrame(NULL, str, wxDefaultPosition,
 455         wxSize(400, 300));
 456
 457     // Make a menubar
 458     wxMenu *winMenu = new wxMenu;
 459
 460     winMenu->Append(wxID_EXIT, _T("&Close"));
 461     winMenu->Append(ID_NEW_WINDOW, _T("&New") );
 462     wxMenuBar *menuBar = new wxMenuBar;
 463     menuBar->Append(winMenu, _T("&Window"));
 464
 465     winMenu = new wxMenu;
 466     winMenu->Append(ID_DEF_ROTATE_LEFT_KEY, _T("Rotate &left"));
 467     winMenu->Append(ID_DEF_ROTATE_RIGHT_KEY, _T("Rotate &right"));
 468     menuBar->Append(winMenu, _T("&Key"));
 469
 470     frame->SetMenuBar(menuBar);
 471
 472     if (parentFrame)
 473     {
 474         frame->m_canvas = new TestGLCanvas( frame, parentFrame->m_canvas,
 475             wxID_ANY, wxDefaultPosition, wxDefaultSize );
 476     }
 477     else
 478     {
 479         frame->m_canvas = new TestGLCanvas(frame, wxID_ANY,
 480             wxDefaultPosition, wxDefaultSize);
 481     }
 482
 483     // Show the frame
 484     frame->Show(true);
 485
 486     return frame;
 487 }
 488
 489 void MyFrame::OnNewWindow( wxCommandEvent& WXUNUSED(event) )
 490 {
 491     (void) Create(this, true);
 492 }
 493
 494 void MyFrame::OnDefRotateLeftKey( wxCommandEvent& WXUNUSED(event) )
 495 {
 496     ScanCodeDialog dial( this, wxID_ANY, m_canvas->m_rleft,
 497         wxString(_T("Left")), _T("Define key") );
 498
 499     int result = dial.ShowModal();
 500
 501     if( result == wxID_OK )
 502         m_canvas->m_rleft = dial.GetValue();
 503 }
 504
 505 void MyFrame::OnDefRotateRightKey( wxCommandEvent& WXUNUSED(event) )
 506 {
 507     ScanCodeDialog dial( this, wxID_ANY, m_canvas->m_rright,
 508         wxString(_T("Right")), _T("Define key") );
 509
 510     int result = dial.ShowModal();
 511
 512     if( result == wxID_OK )
 513         m_canvas->m_rright = dial.GetValue();
 514 }
 515
 516 /*------------------------------------------------------------------
 517   Application object ( equivalent to main() )
 518 ------------------------------------------------------------------ */
 519
 520 IMPLEMENT_APP(MyApp)
 521
 522 bool MyApp::OnInit()
 523 {
 524     // Create the main frame window
 525     (void) MyFrame::Create(NULL);
 526
 527     return true;
 528 }