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 #if defined(__WXMSW__)
 137   struct timeb tb;
 138   ftime( &tb );
 139   secs = tb.time;
 140   msec = tb.millitm;
 141 #elif defined(__WXMAC__) && !defined(__DARWIN__)
 142   wxLongLong tl = wxGetLocalTimeMillis();
 143   secs = (unsigned long) (tl.GetValue() / 1000);
 144   msec = (unsigned long) (tl.GetValue() - secs*1000);
 145 #else
 146   // think every unice has gettimeofday
 147   struct timeval tv;
 148   gettimeofday( &tv, (struct timezone *)NULL );
 149   secs = tv.tv_sec;
 150   msec = tv.tv_usec/1000;
 151 #endif
 152
 153   if( *sec_base == 0 )
 154     *sec_base = secs;
 155
 156   return( (secs-*sec_base)*1000 + msec );
 157 }
 158
 159 /*----------------------------------------------------------------
 160   Implementation of Test-GLCanvas
 161 -----------------------------------------------------------------*/
 162
 163 BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
 164   EVT_SIZE(TestGLCanvas::OnSize)
 165   EVT_PAINT(TestGLCanvas::OnPaint)
 166   EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)
 167   EVT_KEY_DOWN( TestGLCanvas::OnKeyDown )
 168   EVT_KEY_UP( TestGLCanvas::OnKeyUp )
 169   EVT_ENTER_WINDOW( TestGLCanvas::OnEnterWindow )
 170 END_EVENT_TABLE()
 171
 172 unsigned long  TestGLCanvas::m_secbase = 0;
 173 int            TestGLCanvas::m_TimeInitialized = 0;
 174 unsigned long  TestGLCanvas::m_xsynct;
 175 unsigned long  TestGLCanvas::m_gsynct;
 176
 177 TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
 178     const wxPoint& pos, const wxSize& size, long style, const wxString& name):
 179   wxGLCanvas(parent, (wxGLCanvas*) NULL, id, pos, size, style, name )
 180 {
 181     m_init = FALSE;
 182     m_gllist = 0;
 183     m_rleft = WXK_LEFT;
 184     m_rright = WXK_RIGHT;
 185 }
 186
 187 TestGLCanvas::TestGLCanvas(wxWindow *parent, const TestGLCanvas &other,
 188     wxWindowID id, const wxPoint& pos, const wxSize& size, long style,
 189     const wxString& name ) :
 190       wxGLCanvas(parent, other.GetContext(), id, pos, size, style, name  )
 191 {
 192     m_init = FALSE;
 193     m_gllist = other.m_gllist;    /* share display list */
 194     m_rleft = WXK_LEFT;
 195     m_rright = WXK_RIGHT;
 196 }
 197
 198 TestGLCanvas::~TestGLCanvas()
 199 {
 200 }
 201
 202 void TestGLCanvas::Render()
 203 {
 204     wxPaintDC dc(this);
 205
 206 #ifndef __WXMOTIF__
 207     if (!GetContext()) return;
 208 #endif
 209
 210     SetCurrent();
 211     /* init OpenGL once, but after SetCurrent */
 212     if (!m_init)
 213     {
 214         InitGL();
 215         m_init = TRUE;
 216     }
 217
 218     glMatrixMode(GL_PROJECTION);
 219     glLoadIdentity();
 220     glFrustum(-0.5F, 0.5F, -0.5F, 0.5F, 1.0F, 3.0F);
 221     glMatrixMode(GL_MODELVIEW);
 222
 223     /* clear color and depth buffers */
 224     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 225
 226   if( m_gllist == 0 )
 227   {
 228     m_gllist = glGenLists( 1 );
 229     glNewList( m_gllist, GL_COMPILE_AND_EXECUTE );
 230     /* draw six faces of a cube */
 231     glBegin(GL_QUADS);
 232     glNormal3f( 0.0F, 0.0F, 1.0F);
 233     glVertex3f( 0.5F, 0.5F, 0.5F); glVertex3f(-0.5F, 0.5F, 0.5F);
 234     glVertex3f(-0.5F,-0.5F, 0.5F); glVertex3f( 0.5F,-0.5F, 0.5F);
 235
 236     glNormal3f( 0.0F, 0.0F,-1.0F);
 237     glVertex3f(-0.5F,-0.5F,-0.5F); glVertex3f(-0.5F, 0.5F,-0.5F);
 238     glVertex3f( 0.5F, 0.5F,-0.5F); glVertex3f( 0.5F,-0.5F,-0.5F);
 239
 240     glNormal3f( 0.0F, 1.0F, 0.0F);
 241     glVertex3f( 0.5F, 0.5F, 0.5F); glVertex3f( 0.5F, 0.5F,-0.5F);
 242     glVertex3f(-0.5F, 0.5F,-0.5F); glVertex3f(-0.5F, 0.5F, 0.5F);
 243
 244     glNormal3f( 0.0F,-1.0F, 0.0F);
 245     glVertex3f(-0.5F,-0.5F,-0.5F); glVertex3f( 0.5F,-0.5F,-0.5F);
 246     glVertex3f( 0.5F,-0.5F, 0.5F); glVertex3f(-0.5F,-0.5F, 0.5F);
 247
 248     glNormal3f( 1.0F, 0.0F, 0.0F);
 249     glVertex3f( 0.5F, 0.5F, 0.5F); glVertex3f( 0.5F,-0.5F, 0.5F);
 250     glVertex3f( 0.5F,-0.5F,-0.5F); glVertex3f( 0.5F, 0.5F,-0.5F);
 251
 252     glNormal3f(-1.0F, 0.0F, 0.0F);
 253     glVertex3f(-0.5F,-0.5F,-0.5F); glVertex3f(-0.5F,-0.5F, 0.5F);
 254     glVertex3f(-0.5F, 0.5F, 0.5F); glVertex3f(-0.5F, 0.5F,-0.5F);
 255     glEnd();
 256
 257     glEndList();
 258   }
 259   else
 260     glCallList( m_gllist );
 261
 262   glFlush();
 263   SwapBuffers();
 264 }
 265
 266 void TestGLCanvas::OnEnterWindow( wxMouseEvent& event )
 267 {
 268     SetFocus();
 269 }
 270
 271 void TestGLCanvas::OnPaint( wxPaintEvent& event )
 272 {
 273     Render();
 274 }
 275
 276 void TestGLCanvas::OnSize(wxSizeEvent& event)
 277 {
 278     // this is also necessary to update the context on some platforms
 279     wxGLCanvas::OnSize(event);
 280
 281     // set GL viewport (not called by wxGLCanvas::OnSize on all platforms...)
 282                 int w, h;
 283                 GetClientSize(&w, &h);
 284 #ifndef __WXMOTIF__
 285     if (GetContext())
 286 #endif
 287     {
 288         SetCurrent();
 289         glViewport(0, 0, (GLint) w, (GLint) h);
 290     }
 291 }
 292
 293 void TestGLCanvas::OnEraseBackground(wxEraseEvent& event)
 294 {
 295   // Do nothing, to avoid flashing.
 296 }
 297
 298 void TestGLCanvas::InitGL()
 299 {
 300     SetCurrent();
 301
 302     /* set viewing projection */
 303     glMatrixMode(GL_PROJECTION);
 304     glFrustum(-0.5F, 0.5F, -0.5F, 0.5F, 1.0F, 3.0F);
 305
 306     /* position viewer */
 307     glMatrixMode(GL_MODELVIEW);
 308     glTranslatef(0.0F, 0.0F, -2.0F);
 309
 310     /* position object */
 311     glRotatef(30.0F, 1.0F, 0.0F, 0.0F);
 312     glRotatef(30.0F, 0.0F, 1.0F, 0.0F);
 313
 314     glEnable(GL_DEPTH_TEST);
 315     glEnable(GL_LIGHTING);
 316     glEnable(GL_LIGHT0);
 317 }
 318
 319 GLfloat TestGLCanvas::CalcRotateSpeed( unsigned long acceltime )
 320 {
 321   GLfloat t,v;
 322
 323   t = ((GLfloat)acceltime) / 1000.0f;
 324
 325   if( t < 0.5f )
 326     v = t;
 327   else if( t < 1.0f )
 328     v = t * (2.0f - t);
 329   else
 330     v = 0.75f;
 331
 332   return(v);
 333 }
 334
 335 GLfloat TestGLCanvas::CalcRotateAngle( unsigned long lasttime,
 336                                   unsigned long acceltime )
 337 {
 338     GLfloat t,s1,s2;
 339
 340     t = ((GLfloat)(acceltime - lasttime)) / 1000.0f;
 341     s1 = CalcRotateSpeed( lasttime );
 342     s2 = CalcRotateSpeed( acceltime );
 343
 344     return( t * (s1 + s2) * 135.0f );
 345 }
 346
 347 void TestGLCanvas::Action( long code, unsigned long lasttime,
 348                            unsigned long acceltime )
 349 {
 350     GLfloat angle = CalcRotateAngle( lasttime, acceltime );
 351
 352     if (code == m_rleft)
 353         Rotate( angle );
 354     else if (code == m_rright)
 355             Rotate( -angle );
 356 }
 357
 358 void TestGLCanvas::OnKeyDown( wxKeyEvent& event )
 359 {
 360     long evkey = event.KeyCode();
 361     if (evkey == 0) return;
 362
 363     if (!m_TimeInitialized)
 364     {
 365         m_TimeInitialized = 1;
 366         m_xsynct = event.m_timeStamp;
 367         m_gsynct = wxStopWatch(&m_secbase);
 368
 369         m_Key = evkey;
 370         m_StartTime = 0;
 371         m_LastTime = 0;
 372         m_LastRedraw = 0;
 373     }
 374
 375     unsigned long currTime = event.m_timeStamp - m_xsynct;
 376
 377     if (evkey != m_Key)
 378     {
 379         m_Key = evkey;
 380         m_LastRedraw = m_StartTime = m_LastTime = currTime;
 381     }
 382
 383     if (currTime >= m_LastRedraw)      // Redraw:
 384     {
 385         Action( m_Key, m_LastTime-m_StartTime, currTime-m_StartTime );
 386
 387 #if defined(__WXMAC__) && !defined(__DARWIN__)
 388         m_LastRedraw = currTime;        // wxStopWatch() doesn't work on Mac...
 389 #else
 390         m_LastRedraw = wxStopWatch(&m_secbase) - m_gsynct;
 391 #endif
 392         m_LastTime = currTime;
 393     }
 394
 395     event.Skip();
 396 }
 397
 398 void TestGLCanvas::OnKeyUp( wxKeyEvent& event )
 399 {
 400     m_Key = 0;
 401     m_StartTime = 0;
 402     m_LastTime = 0;
 403     m_LastRedraw = 0;
 404
 405     event.Skip();
 406 }
 407
 408 void TestGLCanvas::Rotate( GLfloat deg )
 409 {
 410     SetCurrent();
 411
 412     glMatrixMode(GL_MODELVIEW);
 413     glRotatef((GLfloat)deg, 0.0F, 0.0F, 1.0F);
 414     Refresh(FALSE);
 415 }
 416
 417
 418 /* -----------------------------------------------------------------------
 419   Main Window
 420 -------------------------------------------------------------------------*/
 421
 422 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 423     EVT_MENU(wxID_EXIT, MyFrame::OnExit)
 424     EVT_MENU( ID_NEW_WINDOW, MyFrame::OnNewWindow)
 425     EVT_MENU( ID_DEF_ROTATE_LEFT_KEY, MyFrame::OnDefRotateLeftKey)
 426     EVT_MENU( ID_DEF_ROTATE_RIGHT_KEY, MyFrame::OnDefRotateRightKey)
 427 END_EVENT_TABLE()
 428
 429 // My frame constructor
 430 MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
 431                  const wxSize& size, long style)
 432          : wxFrame(frame, -1, title, pos, size, style)
 433 {
 434     m_canvas = NULL;
 435 }
 436
 437 // Intercept menu commands
 438 void MyFrame::OnExit(wxCommandEvent& event)
 439 {
 440     Destroy();
 441 }
 442
 443 void MyFrame::OnNewWindow(wxCommandEvent& event)
 444 {
 445   MyFrame *frame = new MyFrame(NULL, "Cube OpenGL Demo Clone",
 446                                wxPoint(50, 50), wxSize(400, 300));
 447   // Give it an icon
 448 #ifdef __WXMSW__
 449   frame->SetIcon(wxIcon("mondrian"));
 450 #endif
 451
 452   // Make a menubar
 453   wxMenu *winMenu = new wxMenu;
 454
 455   winMenu->Append(wxID_EXIT, "&Close");
 456   winMenu->Append(ID_NEW_WINDOW, "&New" );
 457   wxMenuBar *menuBar = new wxMenuBar;
 458   menuBar->Append(winMenu, "&Window");
 459
 460   winMenu = new wxMenu;
 461   winMenu->Append(ID_DEF_ROTATE_LEFT_KEY, "Rotate &left");
 462   winMenu->Append(ID_DEF_ROTATE_RIGHT_KEY, "Rotate &right");
 463   menuBar->Append(winMenu, "&Key");
 464
 465   frame->SetMenuBar(menuBar);
 466
 467   frame->m_canvas = new TestGLCanvas( frame, *m_canvas, -1,
 468                wxDefaultPosition, wxDefaultSize );
 469
 470   // Show the frame
 471   frame->Show(TRUE);
 472 }
 473
 474 void MyFrame::OnDefRotateLeftKey(wxCommandEvent& event)
 475 {
 476   ScanCodeDialog dial( this, -1, m_canvas->m_rleft,
 477                        wxString("Left"), "Define key" );
 478   int result = dial.ShowModal();
 479   if( result == wxID_OK )
 480     m_canvas->m_rleft = dial.GetValue();
 481 }
 482 void MyFrame::OnDefRotateRightKey(wxCommandEvent& event)
 483 {
 484   ScanCodeDialog dial( this, -1, m_canvas->m_rright,
 485                        wxString("Right"), "Define key" );
 486   int result = dial.ShowModal();
 487   if( result == wxID_OK )
 488     m_canvas->m_rright = dial.GetValue();
 489 }
 490
 491 /*------------------------------------------------------------------
 492   Application object ( equivalent to main() )
 493 ------------------------------------------------------------------ */
 494
 495 IMPLEMENT_APP(MyApp)
 496
 497 bool MyApp::OnInit(void)
 498 {
 499   wxLog::SetTraceMask(wxTraceMessages);
 500
 501   // Create the main frame window
 502   MyFrame *frame = new MyFrame(NULL, "Cube OpenGL Demo", wxPoint(50, 50),
 503                                wxSize(400, 300));
 504   // Give it an icon
 505 #ifdef wx_msw
 506   frame->SetIcon(wxIcon("mondrian"));
 507 #endif
 508
 509   // Make a menubar
 510   wxMenu *winMenu = new wxMenu;
 511
 512   winMenu->Append(wxID_EXIT, "&Close");
 513   winMenu->Append(ID_NEW_WINDOW, "&New" );
 514   wxMenuBar *menuBar = new wxMenuBar;
 515   menuBar->Append(winMenu, "&Window");
 516
 517   winMenu = new wxMenu;
 518   winMenu->Append(ID_DEF_ROTATE_LEFT_KEY, "Rotate &left");
 519   winMenu->Append(ID_DEF_ROTATE_RIGHT_KEY, "Rotate &right");
 520   menuBar->Append(winMenu, "&Key");
 521
 522   frame->SetMenuBar(menuBar);
 523
 524   frame->m_canvas = new TestGLCanvas(frame, -1, wxDefaultPosition, wxDefaultSize);
 525
 526   // Show the frame
 527   frame->Show(TRUE);
 528
 529   return TRUE;
 530 }