src/gtk/glcanvas.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        gtk/glcanvas.cpp
   3 // Purpose:     wxGLCanvas, for using OpenGL/Mesa with wxWidgets and GTK
   4 // Author:      Robert Roebling
   5 // Modified by:
   6 // Created:     17/08/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robert Roebling
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  13 #pragma implementation "glcanvas.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #include "wx/setup.h"
  20
  21 #if wxUSE_GLCANVAS
  22
  23 #include "wx/glcanvas.h"
  24
  25 #include "wx/frame.h"
  26 #include "wx/colour.h"
  27 #include "wx/module.h"
  28 #include "wx/app.h"
  29
  30 extern "C"
  31 {
  32 #include "gtk/gtk.h"
  33 #include "gdk/gdk.h"
  34 #include "gdk/gdkx.h"
  35 }
  36
  37 #include "wx/gtk/win_gtk.h"
  38
  39 // DLL options compatibility check:
  40 #include "wx/build.h"
  41 WX_CHECK_BUILD_OPTIONS("wxGL")
  42
  43
  44 //---------------------------------------------------------------------------
  45 // static variables
  46 //---------------------------------------------------------------------------
  47 int wxGLCanvas::m_glxVersion = 0;
  48
  49 //---------------------------------------------------------------------------
  50 // global data
  51 //---------------------------------------------------------------------------
  52
  53 XVisualInfo *g_vi = (XVisualInfo*) NULL;
  54 //-----------------------------------------------------------------------------
  55 // idle system
  56 //-----------------------------------------------------------------------------
  57
  58 extern void wxapp_install_idle_handler();
  59 extern bool g_isIdle;
  60
  61 //---------------------------------------------------------------------------
  62 // wxGLContext
  63 //---------------------------------------------------------------------------
  64
  65 IMPLEMENT_CLASS(wxGLContext,wxObject)
  66
  67 wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
  68 {
  69     m_window = win;
  70     m_widget = win->m_wxwindow;
  71
  72     wxGLCanvas *gc = (wxGLCanvas*) win;
  73
  74     if (wxGLCanvas::GetGLXVersion() >= 13)
  75       {
  76         // GLX >= 1.3
  77         GLXFBConfig *fbc = gc->m_fbc;
  78         wxCHECK_RET( fbc, _T("invalid GLXFBConfig for OpenGl") );
  79         m_glContext = glXCreateNewContext( GDK_DISPLAY(), fbc[0], GLX_RGBA_TYPE, None, GL_TRUE );
  80       }
  81     else
  82       {
  83         // GLX <= 1.2
  84         XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  85     wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
  86     m_glContext = glXCreateContext( GDK_DISPLAY(), vi, None, GL_TRUE );
  87       }
  88
  89     wxCHECK_RET( m_glContext, _T("Couldn't create OpenGl context") );
  90 }
  91
  92 wxGLContext::wxGLContext(
  93                bool WXUNUSED(isRGB), wxWindow *win,
  94                const wxPalette& WXUNUSED(palette),
  95                const wxGLContext *other        /* for sharing display lists */
  96 )
  97 {
  98     m_window = win;
  99     m_widget = win->m_wxwindow;
 100
 101     wxGLCanvas *gc = (wxGLCanvas*) win;
 102
 103     if (wxGLCanvas::GetGLXVersion() >= 13)
 104       {
 105         // GLX >= 1.3
 106         GLXFBConfig *fbc = gc->m_fbc;
 107         wxCHECK_RET( fbc, _T("invalid GLXFBConfig for OpenGl") );
 108         m_glContext = glXCreateNewContext( GDK_DISPLAY(), fbc[0], GLX_RGBA_TYPE,
 109                                            other ? other->m_glContext : None,
 110                                            GL_TRUE );
 111       }
 112     else
 113       {
 114         // GLX <= 1.2
 115         XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
 116     wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
 117     m_glContext = glXCreateContext( GDK_DISPLAY(), vi,
 118                                     other ? other->m_glContext : None,
 119                                     GL_TRUE );
 120       }
 121
 122     if ( !m_glContext )
 123     {
 124         wxFAIL_MSG( _T("Couldn't create OpenGl context") );
 125     }
 126 }
 127
 128 wxGLContext::~wxGLContext()
 129 {
 130     if (!m_glContext) return;
 131
 132     if (m_glContext == glXGetCurrentContext())
 133     {
 134       if (wxGLCanvas::GetGLXVersion() >= 13)
 135         // GLX >= 1.3
 136         glXMakeContextCurrent( GDK_DISPLAY(), None, None, NULL);
 137       else
 138         // GLX <= 1.2
 139         glXMakeCurrent( GDK_DISPLAY(), None, NULL);
 140     }
 141
 142     glXDestroyContext( GDK_DISPLAY(), m_glContext );
 143 }
 144
 145 void wxGLContext::SwapBuffers()
 146 {
 147     if (m_glContext)
 148     {
 149         GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
 150         glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
 151     }
 152 }
 153
 154 void wxGLContext::SetCurrent()
 155 {
 156     if (m_glContext)
 157     {
 158         GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
 159
 160       if (wxGLCanvas::GetGLXVersion() >= 13)
 161         // GLX >= 1.3
 162         glXMakeContextCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), GDK_WINDOW_XWINDOW(window), m_glContext );
 163       else
 164         // GLX <= 1.2
 165         glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
 166     }
 167 }
 168
 169 void wxGLContext::SetColour(const wxChar *colour)
 170 {
 171     wxColour col = wxTheColourDatabase->Find(colour);
 172     if (col.Ok())
 173     {
 174         float r = (float)(col.Red()/256.0);
 175         float g = (float)(col.Green()/256.0);
 176         float b = (float)(col.Blue()/256.0);
 177         glColor3f( r, g, b);
 178     }
 179 }
 180
 181 void wxGLContext::SetupPixelFormat()
 182 {
 183 }
 184
 185 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 186 {
 187 }
 188
 189 wxPalette wxGLContext::CreateDefaultPalette()
 190 {
 191     return wxNullPalette;
 192 }
 193
 194 //-----------------------------------------------------------------------------
 195 // "realize" from m_wxwindow
 196 //-----------------------------------------------------------------------------
 197
 198 extern "C" {
 199 static gint
 200 gtk_glwindow_realized_callback( GtkWidget *WXUNUSED(widget), wxGLCanvas *win )
 201 {
 202     if ( !win->m_glContext )
 203     {
 204         wxGLContext *share = win->m_sharedContext;
 205         if ( !share && win->m_sharedContextOf )
 206             share = win->m_sharedContextOf->GetContext();
 207
 208         win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, share );
 209     }
 210
 211     return FALSE;
 212 }
 213 }
 214
 215 //-----------------------------------------------------------------------------
 216 // "map" from m_wxwindow
 217 //-----------------------------------------------------------------------------
 218
 219 extern "C" {
 220 static gint
 221 gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 222 {
 223     if (win->m_glContext/* && win->m_exposed*/)
 224     {
 225         wxPaintEvent event( win->GetId() );
 226         event.SetEventObject( win );
 227         win->GetEventHandler()->ProcessEvent( event );
 228
 229         win->m_exposed = FALSE;
 230         win->GetUpdateRegion().Clear();
 231     }
 232
 233     return FALSE;
 234 }
 235 }
 236
 237 //-----------------------------------------------------------------------------
 238 // "expose_event" of m_wxwindow
 239 //-----------------------------------------------------------------------------
 240
 241 extern "C" {
 242 static void
 243 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
 244 {
 245     if (g_isIdle)
 246         wxapp_install_idle_handler();
 247
 248     win->m_exposed = TRUE;
 249
 250     win->GetUpdateRegion().Union( gdk_event->area.x,
 251                                   gdk_event->area.y,
 252                                   gdk_event->area.width,
 253                                   gdk_event->area.height );
 254 }
 255 }
 256
 257 //-----------------------------------------------------------------------------
 258 // "draw" of m_wxwindow
 259 //-----------------------------------------------------------------------------
 260
 261 #ifndef __WXGTK20__
 262 extern "C" {
 263 static void
 264 gtk_glwindow_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxGLCanvas *win )
 265 {
 266     if (g_isIdle)
 267         wxapp_install_idle_handler();
 268
 269     win->m_exposed = TRUE;
 270
 271     win->GetUpdateRegion().Union( rect->x, rect->y,
 272                                   rect->width, rect->height );
 273 }
 274 }
 275 #endif
 276
 277 //-----------------------------------------------------------------------------
 278 // "size_allocate" of m_wxwindow
 279 //-----------------------------------------------------------------------------
 280
 281 extern "C" {
 282 static void
 283 gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxGLCanvas *win )
 284 {
 285     if (g_isIdle)
 286         wxapp_install_idle_handler();
 287
 288     if (!win->m_hasVMT)
 289         return;
 290
 291     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
 292     event.SetEventObject( win );
 293     win->GetEventHandler()->ProcessEvent( event );
 294 }
 295 }
 296
 297 //---------------------------------------------------------------------------
 298 // wxGlCanvas
 299 //---------------------------------------------------------------------------
 300
 301 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 302
 303 BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
 304     EVT_SIZE(wxGLCanvas::OnSize)
 305 END_EVENT_TABLE()
 306
 307 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 308                         const wxPoint& pos, const wxSize& size,
 309                         long style, const wxString& name,
 310                         int *attribList,
 311                         const wxPalette& palette )
 312 {
 313     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 314 }
 315
 316 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 317                         const wxGLContext *shared,
 318                         wxWindowID id,
 319                         const wxPoint& pos, const wxSize& size,
 320                         long style, const wxString& name,
 321                         int *attribList,
 322                         const wxPalette& palette )
 323 {
 324     Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
 325 }
 326
 327 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 328                         const wxGLCanvas *shared,
 329                         wxWindowID id,
 330                         const wxPoint& pos, const wxSize& size,
 331                         long style, const wxString& name,
 332                         int *attribList,
 333                         const wxPalette& palette )
 334 {
 335     Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
 336 }
 337
 338 bool wxGLCanvas::Create( wxWindow *parent,
 339                          const wxGLContext *shared,
 340                          const wxGLCanvas *shared_context_of,
 341                          wxWindowID id,
 342                          const wxPoint& pos, const wxSize& size,
 343                          long style, const wxString& name,
 344                          int *attribList,
 345                          const wxPalette& palette)
 346 {
 347     m_sharedContext = (wxGLContext*)shared;  // const_cast
 348     m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
 349     m_glContext = (wxGLContext*) NULL;
 350
 351     m_exposed = FALSE;
 352     m_noExpose = TRUE;
 353     m_nativeSizeEvent = TRUE;
 354     m_fbc = NULL;
 355     m_vi = NULL;
 356
 357     // to be sure the glx version is known
 358     wxGLCanvas::QueryGLXVersion();
 359
 360     if (wxGLCanvas::GetGLXVersion() >= 13)
 361       {
 362         // GLX >= 1.3 uses a GLXFBConfig
 363         GLXFBConfig * fbc = NULL;
 364         if (wxTheApp->m_glFBCInfo != NULL)
 365           {
 366             fbc = (GLXFBConfig *) wxTheApp->m_glFBCInfo;
 367             m_canFreeFBC = FALSE; // owned by wxTheApp - don't free upon destruction
 368           }
 369         else
 370           {
 371             fbc = (GLXFBConfig *) wxGLCanvas::ChooseGLFBC(attribList);
 372             m_canFreeFBC = TRUE;
 373           }
 374         m_fbc = fbc;  // save for later use
 375         wxCHECK_MSG( m_fbc, FALSE, _T("required FBConfig couldn't be found") );
 376       }
 377
 378     XVisualInfo *vi = NULL;
 379     if (wxTheApp->m_glVisualInfo != NULL)
 380     {
 381         vi = (XVisualInfo *)wxTheApp->m_glVisualInfo;
 382         m_canFreeVi = FALSE; // owned by wxTheApp - don't free upon destruction
 383     }
 384     else
 385     {
 386         if (wxGLCanvas::GetGLXVersion() >= 13)
 387           // GLX >= 1.3
 388           vi = glXGetVisualFromFBConfig(GDK_DISPLAY(), m_fbc[0]);
 389         else
 390           // GLX <= 1.2
 391         vi = (XVisualInfo *) ChooseGLVisual(attribList);
 392         m_canFreeVi = TRUE;
 393     }
 394     m_vi = vi;  // save for later use
 395
 396     wxCHECK_MSG( m_vi, FALSE, _T("required visual couldn't be found") );
 397     GdkVisual *visual = gdkx_visual_get( vi->visualid );
 398     GdkColormap *colormap = gdk_colormap_new( visual, TRUE );
 399
 400     gtk_widget_push_colormap( colormap );
 401     gtk_widget_push_visual( visual );
 402
 403     wxWindow::Create( parent, id, pos, size, style, name );
 404
 405     m_glWidget = m_wxwindow;
 406
 407 #ifdef __WXGTK20__
 408     gtk_widget_set_double_buffered( m_glWidget, FALSE );
 409 #endif
 410
 411     gtk_pizza_set_clear( GTK_PIZZA(m_wxwindow), FALSE );
 412
 413     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "realize",
 414                             GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
 415
 416     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "map",
 417                             GTK_SIGNAL_FUNC(gtk_glwindow_map_callback), (gpointer) this );
 418
 419     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "expose_event",
 420         GTK_SIGNAL_FUNC(gtk_glwindow_expose_callback), (gpointer)this );
 421
 422 #ifndef __WXGTK20__
 423     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "draw",
 424         GTK_SIGNAL_FUNC(gtk_glwindow_draw_callback), (gpointer)this );
 425 #endif
 426
 427     gtk_signal_connect( GTK_OBJECT(m_widget), "size_allocate",
 428         GTK_SIGNAL_FUNC(gtk_glcanvas_size_callback), (gpointer)this );
 429
 430     gtk_widget_pop_visual();
 431     gtk_widget_pop_colormap();
 432
 433     // if our parent window is already visible, we had been realized before we
 434     // connected to the "realize" signal and hence our m_glContext hasn't been
 435     // initialized yet and we have to do it now
 436     if (GTK_WIDGET_REALIZED(m_wxwindow))
 437         gtk_glwindow_realized_callback( m_wxwindow, this );
 438
 439     if (GTK_WIDGET_MAPPED(m_wxwindow))
 440         gtk_glwindow_map_callback( m_wxwindow, this );
 441
 442     return TRUE;
 443 }
 444
 445 wxGLCanvas::~wxGLCanvas()
 446 {
 447   GLXFBConfig * fbc = (GLXFBConfig *) m_fbc;
 448   if (fbc && m_canFreeFBC) XFree( fbc );
 449
 450   XVisualInfo *vi = (XVisualInfo *) m_vi;
 451     if (vi && m_canFreeVi) XFree( vi );
 452
 453     delete m_glContext;
 454 }
 455
 456 void* wxGLCanvas::ChooseGLVisual(int *attribList)
 457 {
 458     int data[512];
 459   GetGLAttribListFromWX( attribList, data );
 460   attribList = (int*) data;
 461
 462   Display *dpy = GDK_DISPLAY();
 463
 464   return glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 465 }
 466
 467 void* wxGLCanvas::ChooseGLFBC(int *attribList)
 468 {
 469   int data[512];
 470   GetGLAttribListFromWX( attribList, data );
 471         attribList = (int*) data;
 472
 473   int returned;
 474   return glXChooseFBConfig( GDK_DISPLAY(), DefaultScreen(GDK_DISPLAY()),
 475                             attribList, &returned );
 476 }
 477
 478
 479 void wxGLCanvas::GetGLAttribListFromWX(int *wx_attribList, int *gl_attribList )
 480 {
 481   if (!wx_attribList)
 482     {
 483       if (wxGLCanvas::GetGLXVersion() >= 13)
 484         // leave GLX >= 1.3 choose the default attributes
 485         gl_attribList[0] = 0;
 486       else
 487         {
 488           int i = 0;
 489           // default settings if attriblist = 0
 490           gl_attribList[i++] = GLX_RGBA;
 491           gl_attribList[i++] = GLX_DOUBLEBUFFER;
 492           gl_attribList[i++] = GLX_DEPTH_SIZE;   gl_attribList[i++] = 1;
 493           gl_attribList[i++] = GLX_RED_SIZE;     gl_attribList[i++] = 1;
 494           gl_attribList[i++] = GLX_GREEN_SIZE;   gl_attribList[i++] = 1;
 495           gl_attribList[i++] = GLX_BLUE_SIZE;    gl_attribList[i++] = 1;
 496           gl_attribList[i++] = GLX_ALPHA_SIZE;   gl_attribList[i++] = 0;
 497           gl_attribList[i++] = None;
 498         }
 499     }
 500     else
 501     {
 502       int arg=0, p=0;
 503       while( (wx_attribList[arg]!=0) && (p<510) )
 504       {
 505           switch( wx_attribList[arg++] )
 506         {
 507             case WX_GL_RGBA:
 508               if (wxGLCanvas::GetGLXVersion() <= 12)
 509                 // for GLX >= 1.3, GLX_RGBA is useless (setting this flags will crash on most opengl implm)
 510                 gl_attribList[p++] = GLX_RGBA;
 511               break;
 512           case WX_GL_BUFFER_SIZE:
 513               gl_attribList[p++]=GLX_BUFFER_SIZE; gl_attribList[p++]=wx_attribList[arg++]; break;
 514           case WX_GL_LEVEL:
 515               gl_attribList[p++]=GLX_LEVEL; gl_attribList[p++]=wx_attribList[arg++]; break;
 516             case WX_GL_DOUBLEBUFFER:
 517               if (wxGLCanvas::GetGLXVersion() <= 12)
 518                 gl_attribList[p++] = GLX_DOUBLEBUFFER;
 519               else
 520                 // for GLX >= 1.3, GLX_DOUBLEBUFFER format is different (1 <=> True)
 521                 // it seems this flag is useless for some hardware opengl implementation.
 522                 // but for Mesa 6.2.1, this flag is used so don't ignore it.
 523                 gl_attribList[p++] = GLX_DOUBLEBUFFER; gl_attribList[p++]=1;
 524               break;
 525             case WX_GL_STEREO: gl_attribList[p++] = GLX_STEREO; break;
 526           case WX_GL_AUX_BUFFERS:
 527               gl_attribList[p++]=GLX_AUX_BUFFERS; gl_attribList[p++]=wx_attribList[arg++]; break;
 528           case WX_GL_MIN_RED:
 529               gl_attribList[p++]=GLX_RED_SIZE; gl_attribList[p++]=wx_attribList[arg++]; break;
 530           case WX_GL_MIN_GREEN:
 531               gl_attribList[p++]=GLX_GREEN_SIZE; gl_attribList[p++]=wx_attribList[arg++]; break;
 532           case WX_GL_MIN_BLUE:
 533               gl_attribList[p++]=GLX_BLUE_SIZE; gl_attribList[p++]=wx_attribList[arg++]; break;
 534           case WX_GL_MIN_ALPHA:
 535               gl_attribList[p++]=GLX_ALPHA_SIZE; gl_attribList[p++]=wx_attribList[arg++]; break;
 536           case WX_GL_DEPTH_SIZE:
 537               gl_attribList[p++]=GLX_DEPTH_SIZE; gl_attribList[p++]=wx_attribList[arg++]; break;
 538           case WX_GL_STENCIL_SIZE:
 539               gl_attribList[p++]=GLX_STENCIL_SIZE; gl_attribList[p++]=wx_attribList[arg++]; break;
 540           case WX_GL_MIN_ACCUM_RED:
 541               gl_attribList[p++]=GLX_ACCUM_RED_SIZE; gl_attribList[p++]=wx_attribList[arg++]; break;
 542           case WX_GL_MIN_ACCUM_GREEN:
 543               gl_attribList[p++]=GLX_ACCUM_GREEN_SIZE; gl_attribList[p++]=wx_attribList[arg++]; break;
 544           case WX_GL_MIN_ACCUM_BLUE:
 545               gl_attribList[p++]=GLX_ACCUM_BLUE_SIZE; gl_attribList[p++]=wx_attribList[arg++]; break;
 546           case WX_GL_MIN_ACCUM_ALPHA:
 547               gl_attribList[p++]=GLX_ACCUM_ALPHA_SIZE; gl_attribList[p++]=wx_attribList[arg++]; break;
 548           default:
 549             break;
 550         }
 551       }
 552       gl_attribList[p] = 0;
 553     }
 554 }
 555
 556 void wxGLCanvas::QueryGLXVersion()
 557 {
 558   if (m_glxVersion == 0)
 559     {
 560       // check the GLX version
 561       int glxMajorVer, glxMinorVer;
 562       bool ok = glXQueryVersion(GDK_DISPLAY(), &glxMajorVer, &glxMinorVer);
 563       wxASSERT_MSG( ok, _T("GLX version not found") );
 564       if (!ok)
 565         m_glxVersion = 10; // 1.0 by default
 566       else
 567         m_glxVersion = glxMajorVer*10 + glxMinorVer;
 568     }
 569 }
 570
 571 int wxGLCanvas::GetGLXVersion()
 572 {
 573   wxASSERT_MSG( m_glxVersion>0, _T("GLX version has not been initialized with wxGLCanvas::QueryGLXVersion()") );
 574   return m_glxVersion;
 575 }
 576
 577
 578 void wxGLCanvas::SwapBuffers()
 579 {
 580     if (m_glContext)
 581         m_glContext->SwapBuffers();
 582 }
 583
 584 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 585 {
 586 }
 587
 588 void wxGLCanvas::SetCurrent()
 589 {
 590     if (m_glContext)
 591         m_glContext->SetCurrent();
 592 }
 593
 594 void wxGLCanvas::SetColour( const wxChar *colour )
 595 {
 596     if (m_glContext)
 597         m_glContext->SetColour( colour );
 598 }
 599
 600 void wxGLCanvas::OnInternalIdle()
 601 {
 602     if (m_glContext && m_exposed)
 603     {
 604         wxPaintEvent event( GetId() );
 605         event.SetEventObject( this );
 606         GetEventHandler()->ProcessEvent( event );
 607
 608         m_exposed = FALSE;
 609         GetUpdateRegion().Clear();
 610     }
 611
 612     wxWindow::OnInternalIdle();
 613 }
 614
 615
 616
 617 //---------------------------------------------------------------------------
 618 // wxGLApp
 619 //---------------------------------------------------------------------------
 620
 621 IMPLEMENT_CLASS(wxGLApp, wxApp)
 622
 623 wxGLApp::~wxGLApp()
 624 {
 625   if (m_glFBCInfo)
 626     XFree(m_glFBCInfo);
 627     if (m_glVisualInfo)
 628         XFree(m_glVisualInfo);
 629 }
 630
 631 bool wxGLApp::InitGLVisual(int *attribList)
 632 {
 633   wxGLCanvas::QueryGLXVersion();
 634
 635   if (wxGLCanvas::GetGLXVersion() >= 13)
 636     {
 637       // GLX >= 1.3
 638       if (m_glFBCInfo)
 639         XFree(m_glFBCInfo);
 640       m_glFBCInfo = wxGLCanvas::ChooseGLFBC(attribList);
 641
 642       if (m_glFBCInfo)
 643         {
 644     if (m_glVisualInfo)
 645         XFree(m_glVisualInfo);
 646           m_glVisualInfo = glXGetVisualFromFBConfig(GDK_DISPLAY(), ((GLXFBConfig *)m_glFBCInfo)[0]);
 647         }
 648       return (m_glFBCInfo != NULL) && (m_glVisualInfo != NULL);
 649     }
 650   else
 651     {
 652       // GLX <= 1.2
 653       if (m_glVisualInfo)
 654         XFree(m_glVisualInfo);
 655     m_glVisualInfo = wxGLCanvas::ChooseGLVisual(attribList);
 656     return m_glVisualInfo != NULL;
 657     }
 658 }
 659
 660 #endif
 661     // wxUSE_GLCANVAS
 662