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