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