src/gtk/glcanvas.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/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 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #if wxUSE_GLCANVAS
  16
  17 #include "wx/glcanvas.h"
  18
  19 #ifndef WX_PRECOMP
  20     #include "wx/app.h"
  21     #include "wx/frame.h"
  22     #include "wx/colour.h"
  23     #include "wx/module.h"
  24 #endif // WX_PRECOMP
  25
  26 extern "C"
  27 {
  28 #include "gtk/gtk.h"
  29 #include "gdk/gdk.h"
  30 #include "gdk/gdkx.h"
  31 }
  32
  33 #include "wx/gtk/win_gtk.h"
  34 #include "wx/gtk/private.h"
  35
  36 // DLL options compatibility check:
  37 #include "wx/build.h"
  38 WX_CHECK_BUILD_OPTIONS("wxGL")
  39
  40
  41 //---------------------------------------------------------------------------
  42 // static variables
  43 //---------------------------------------------------------------------------
  44 int wxGLCanvas::m_glxVersion = 0;
  45
  46 //---------------------------------------------------------------------------
  47 // global data
  48 //---------------------------------------------------------------------------
  49
  50 XVisualInfo *g_vi = (XVisualInfo*) NULL;
  51
  52 //---------------------------------------------------------------------------
  53 // wxGLContext
  54 //---------------------------------------------------------------------------
  55
  56 IMPLEMENT_CLASS(wxGLContext,wxObject)
  57
  58 wxGLContext::wxGLContext(wxWindow* win, const wxGLContext* other)
  59 {
  60     wxGLCanvas *gc = (wxGLCanvas*) win;
  61
  62     if (wxGLCanvas::GetGLXVersion() >= 13)
  63     {
  64         // GLX >= 1.3
  65         GLXFBConfig *fbc = gc->m_fbc;
  66         wxCHECK_RET( fbc, _T("invalid GLXFBConfig for OpenGl") );
  67         m_glContext = glXCreateNewContext( GDK_DISPLAY(), fbc[0], GLX_RGBA_TYPE,
  68                                            other ? other->m_glContext : None,
  69                                            GL_TRUE );
  70     }
  71     else
  72     {
  73         // GLX <= 1.2
  74         XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  75         wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
  76         m_glContext = glXCreateContext( GDK_DISPLAY(), vi,
  77                                         other ? other->m_glContext : None,
  78                                         GL_TRUE );
  79     }
  80
  81     if ( !m_glContext )
  82     {
  83         wxFAIL_MSG( _T("Couldn't create OpenGl context") );
  84     }
  85 }
  86
  87 wxGLContext::~wxGLContext()
  88 {
  89     if (!m_glContext) return;
  90
  91     if (m_glContext == glXGetCurrentContext())
  92     {
  93         if (wxGLCanvas::GetGLXVersion() >= 13)
  94             // GLX >= 1.3
  95             glXMakeContextCurrent( GDK_DISPLAY(), None, None, NULL);
  96         else
  97             // GLX <= 1.2
  98             glXMakeCurrent( GDK_DISPLAY(), None, NULL);
  99     }
 100
 101     glXDestroyContext( GDK_DISPLAY(), m_glContext );
 102 }
 103
 104 void wxGLContext::SetCurrent(const wxGLCanvas& win) const
 105 {
 106     if (m_glContext)
 107     {
 108         GdkWindow *window = GTK_PIZZA(win.m_wxwindow)->bin_window;
 109
 110         if (wxGLCanvas::GetGLXVersion() >= 13)
 111             // GLX >= 1.3
 112             glXMakeContextCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), GDK_WINDOW_XWINDOW(window), m_glContext );
 113         else
 114             // GLX <= 1.2
 115             glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
 116     }
 117 }
 118
 119
 120 //-----------------------------------------------------------------------------
 121 // "realize" from m_wxwindow
 122 //-----------------------------------------------------------------------------
 123
 124 extern "C" {
 125 static gint
 126 gtk_glwindow_realized_callback( GtkWidget *WXUNUSED(widget), wxGLCanvas *win )
 127 {
 128     if (!win->m_glContext && win->m_createImplicitContext)
 129     {
 130         wxGLContext *share = win->m_sharedContext;
 131         if ( !share && win->m_sharedContextOf )
 132             share = win->m_sharedContextOf->GetContext();
 133
 134         win->m_glContext = new wxGLContext(win, share);
 135     }
 136
 137     return FALSE;
 138 }
 139 }
 140
 141 //-----------------------------------------------------------------------------
 142 // "map" from m_wxwindow
 143 //-----------------------------------------------------------------------------
 144
 145 extern "C" {
 146 static gint
 147 gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 148 {
 149     // CF: Can the "if" line be removed, and the code unconditionally (always) be run?
 150     if (win->m_glContext || !win->m_createImplicitContext)
 151     {
 152         wxPaintEvent event( win->GetId() );
 153         event.SetEventObject( win );
 154         win->GetEventHandler()->ProcessEvent( event );
 155
 156         win->m_exposed = false;
 157         win->GetUpdateRegion().Clear();
 158     }
 159
 160     return FALSE;
 161 }
 162 }
 163
 164 //-----------------------------------------------------------------------------
 165 // "expose_event" of m_wxwindow
 166 //-----------------------------------------------------------------------------
 167
 168 extern "C" {
 169 static gboolean
 170 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
 171 {
 172     // don't need to install idle handler, its done from "event" signal
 173
 174     win->m_exposed = true;
 175
 176     win->GetUpdateRegion().Union( gdk_event->area.x,
 177                                   gdk_event->area.y,
 178                                   gdk_event->area.width,
 179                                   gdk_event->area.height );
 180     return false;
 181 }
 182 }
 183
 184 //-----------------------------------------------------------------------------
 185 // "size_allocate" of m_wxwindow
 186 //-----------------------------------------------------------------------------
 187
 188 extern "C" {
 189 static void
 190 gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxGLCanvas *win )
 191 {
 192     if (g_isIdle)
 193         wxapp_install_idle_handler();
 194
 195     if (!win->m_hasVMT)
 196         return;
 197
 198     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
 199     event.SetEventObject( win );
 200     win->GetEventHandler()->ProcessEvent( event );
 201 }
 202 }
 203
 204 //---------------------------------------------------------------------------
 205 // wxGlCanvas
 206 //---------------------------------------------------------------------------
 207
 208 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 209
 210 BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
 211     EVT_SIZE(wxGLCanvas::OnSize)
 212 END_EVENT_TABLE()
 213
 214 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 215                         int *attribList,
 216                         const wxPoint& pos, const wxSize& size,
 217                         long style, const wxString& name,
 218                         const wxPalette& palette )
 219     : m_createImplicitContext(false)
 220 {
 221     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 222 }
 223
 224 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 225                         const wxPoint& pos, const wxSize& size,
 226                         long style, const wxString& name,
 227                         int *attribList,
 228                         const wxPalette& palette )
 229     : m_createImplicitContext(true)
 230 {
 231     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 232 }
 233
 234 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 235                         const wxGLContext *shared,
 236                         wxWindowID id,
 237                         const wxPoint& pos, const wxSize& size,
 238                         long style, const wxString& name,
 239                         int *attribList,
 240                         const wxPalette& palette )
 241     : m_createImplicitContext(true)
 242 {
 243     Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
 244 }
 245
 246 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 247                         const wxGLCanvas *shared,
 248                         wxWindowID id,
 249                         const wxPoint& pos, const wxSize& size,
 250                         long style, const wxString& name,
 251                         int *attribList,
 252                         const wxPalette& palette )
 253     : m_createImplicitContext(true)
 254 {
 255     Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
 256 }
 257
 258 bool wxGLCanvas::Create( wxWindow *parent,
 259                          const wxGLContext *shared,
 260                          const wxGLCanvas *shared_context_of,
 261                          wxWindowID id,
 262                          const wxPoint& pos, const wxSize& size,
 263                          long style, const wxString& name,
 264                          int *attribList,
 265                          const wxPalette& palette)
 266 {
 267     m_sharedContext = (wxGLContext*)shared;  // const_cast
 268     m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
 269     m_glContext = (wxGLContext*) NULL;
 270
 271     m_exposed = false;
 272     m_noExpose = true;
 273     m_nativeSizeEvent = true;
 274     m_fbc = NULL;
 275     m_vi = NULL;
 276
 277     // to be sure the glx version is known
 278     wxGLCanvas::QueryGLXVersion();
 279
 280     if (wxGLCanvas::GetGLXVersion() >= 13)
 281     {
 282         // GLX >= 1.3 uses a GLXFBConfig
 283         GLXFBConfig * fbc = NULL;
 284         if (wxTheApp->m_glFBCInfo != NULL)
 285         {
 286             fbc = (GLXFBConfig *) wxTheApp->m_glFBCInfo;
 287             m_canFreeFBC = false; // owned by wxTheApp - don't free upon destruction
 288         }
 289         else
 290         {
 291             fbc = (GLXFBConfig *) wxGLCanvas::ChooseGLFBC(attribList);
 292             m_canFreeFBC = true;
 293         }
 294         m_fbc = fbc;  // save for later use
 295         wxCHECK_MSG( m_fbc, false, _T("required FBConfig couldn't be found") );
 296     }
 297
 298     XVisualInfo *vi = NULL;
 299     if (wxTheApp->m_glVisualInfo != NULL)
 300     {
 301         vi = (XVisualInfo *)wxTheApp->m_glVisualInfo;
 302         m_canFreeVi = false; // owned by wxTheApp - don't free upon destruction
 303     }
 304     else
 305     {
 306         if (wxGLCanvas::GetGLXVersion() >= 13)
 307         // GLX >= 1.3
 308             vi = glXGetVisualFromFBConfig(GDK_DISPLAY(), m_fbc[0]);
 309         else
 310             // GLX <= 1.2
 311             vi = (XVisualInfo *) ChooseGLVisual(attribList);
 312
 313         m_canFreeVi = true;
 314     }
 315
 316     m_vi = vi;  // save for later use
 317
 318     wxCHECK_MSG( m_vi, false, _T("required visual couldn't be found") );
 319     GdkVisual *visual;
 320     GdkColormap *colormap;
 321
 322     // MR: This needs a fix for lower gtk+ versions too. Might need to rethink logic (FIXME)
 323 #if defined(__WXGTK20__) && GTK_CHECK_VERSION(2,2,0)
 324     if (!gtk_check_version(2,2,0))
 325     {
 326         wxWindow::Create( parent, id, pos, size, style, name );
 327
 328         m_glWidget = m_wxwindow;
 329
 330         GdkScreen *screen = gtk_widget_get_screen( m_glWidget );
 331         colormap = gdk_screen_get_default_colormap(screen);
 332         visual = gdk_colormap_get_visual(colormap);
 333
 334         if (GDK_VISUAL_XVISUAL(visual)->visualid != vi->visualid)
 335         {
 336             visual = gdk_x11_screen_lookup_visual( screen, vi->visualid );
 337             colormap = gdk_colormap_new(visual, FALSE);
 338         }
 339
 340         gtk_widget_set_colormap( m_glWidget, colormap );
 341     }
 342     else
 343 #endif
 344     {
 345         visual = gdkx_visual_get( vi->visualid );
 346         colormap = gdk_colormap_new( visual, TRUE );
 347
 348         gtk_widget_push_colormap( colormap );
 349
 350         wxWindow::Create( parent, id, pos, size, style, name );
 351         m_glWidget = m_wxwindow;
 352     }
 353
 354     gtk_widget_set_double_buffered( m_glWidget, FALSE );
 355
 356     g_signal_connect(m_wxwindow, "realize",       G_CALLBACK(gtk_glwindow_realized_callback), this);
 357     g_signal_connect(m_wxwindow, "map",           G_CALLBACK(gtk_glwindow_map_callback),      this);
 358     g_signal_connect(m_wxwindow, "expose_event",  G_CALLBACK(gtk_glwindow_expose_callback),   this);
 359     g_signal_connect(m_widget,   "size_allocate", G_CALLBACK(gtk_glcanvas_size_callback),     this);
 360
 361     if (gtk_check_version(2,2,0) != NULL)
 362     {
 363         gtk_widget_pop_colormap();
 364     }
 365
 366     // if our parent window is already visible, we had been realized before we
 367     // connected to the "realize" signal and hence our m_glContext hasn't been
 368     // initialized yet and we have to do it now
 369     if (GTK_WIDGET_REALIZED(m_wxwindow))
 370         gtk_glwindow_realized_callback( m_wxwindow, this );
 371
 372     if (GTK_WIDGET_MAPPED(m_wxwindow))
 373         gtk_glwindow_map_callback( m_wxwindow, this );
 374
 375     return true;
 376 }
 377
 378 wxGLCanvas::~wxGLCanvas()
 379 {
 380     GLXFBConfig * fbc = (GLXFBConfig *) m_fbc;
 381     if (fbc && m_canFreeFBC)
 382         XFree( fbc );
 383
 384     XVisualInfo *vi = (XVisualInfo *) m_vi;
 385     if (vi && m_canFreeVi)
 386         XFree( vi );
 387
 388     delete m_glContext;
 389 }
 390
 391 void* wxGLCanvas::ChooseGLVisual(int *attribList)
 392 {
 393     int data[512];
 394     GetGLAttribListFromWX( attribList, data );
 395     attribList = (int*) data;
 396
 397     Display *dpy = GDK_DISPLAY();
 398
 399     return glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 400 }
 401
 402 void* wxGLCanvas::ChooseGLFBC(int *attribList)
 403 {
 404     int data[512];
 405     GetGLAttribListFromWX( attribList, data );
 406     attribList = (int*) data;
 407
 408     int returned;
 409     return glXChooseFBConfig( GDK_DISPLAY(), DefaultScreen(GDK_DISPLAY()),
 410                               attribList, &returned );
 411 }
 412
 413
 414 void wxGLCanvas::GetGLAttribListFromWX(int *wx_attribList, int *gl_attribList )
 415 {
 416     if (!wx_attribList)
 417     {
 418         if (wxGLCanvas::GetGLXVersion() >= 13)
 419         // leave GLX >= 1.3 choose the default attributes
 420             gl_attribList[0] = 0;
 421         else
 422         {
 423             int i = 0;
 424             // default settings if attriblist = 0
 425             gl_attribList[i++] = GLX_RGBA;
 426             gl_attribList[i++] = GLX_DOUBLEBUFFER;
 427             gl_attribList[i++] = GLX_DEPTH_SIZE;   gl_attribList[i++] = 1;
 428             gl_attribList[i++] = GLX_RED_SIZE;     gl_attribList[i++] = 1;
 429             gl_attribList[i++] = GLX_GREEN_SIZE;   gl_attribList[i++] = 1;
 430             gl_attribList[i++] = GLX_BLUE_SIZE;    gl_attribList[i++] = 1;
 431             gl_attribList[i++] = GLX_ALPHA_SIZE;   gl_attribList[i++] = 0;
 432             gl_attribList[i++] = None;
 433         }
 434     }
 435     else
 436     {
 437         int arg=0, p=0;
 438         while( (wx_attribList[arg]!=0) && (p<510) )
 439         {
 440             switch( wx_attribList[arg++] )
 441             {
 442                 case WX_GL_RGBA:
 443                     if (wxGLCanvas::GetGLXVersion() <= 12)
 444                         // for GLX >= 1.3, GLX_RGBA is useless (setting this flags will crash on most opengl implm)
 445                         gl_attribList[p++] = GLX_RGBA;
 446                     break;
 447                 case WX_GL_BUFFER_SIZE:
 448                     gl_attribList[p++] = GLX_BUFFER_SIZE;
 449                     gl_attribList[p++] = wx_attribList[arg++];
 450                     break;
 451                 case WX_GL_LEVEL:
 452                     gl_attribList[p++] = GLX_LEVEL;
 453                     gl_attribList[p++] = wx_attribList[arg++];
 454                     break;
 455                 case WX_GL_DOUBLEBUFFER:
 456                     if (wxGLCanvas::GetGLXVersion() <= 12)
 457                         gl_attribList[p++] = GLX_DOUBLEBUFFER;
 458                     else
 459                         // for GLX >= 1.3, GLX_DOUBLEBUFFER format is different (1 <=> True)
 460                         // it seems this flag is useless for some hardware opengl implementation.
 461                         // but for Mesa 6.2.1, this flag is used so don't ignore it.
 462                         gl_attribList[p++] = GLX_DOUBLEBUFFER;
 463                     gl_attribList[p++] = 1;
 464                     break;
 465                 case WX_GL_STEREO:
 466                     gl_attribList[p++] = GLX_STEREO;
 467                     break;
 468                 case WX_GL_AUX_BUFFERS:
 469                     gl_attribList[p++] = GLX_AUX_BUFFERS;
 470                     gl_attribList[p++] = wx_attribList[arg++];
 471                     break;
 472                 case WX_GL_MIN_RED:
 473                     gl_attribList[p++] = GLX_RED_SIZE;
 474                     gl_attribList[p++] = wx_attribList[arg++];
 475                     break;
 476                 case WX_GL_MIN_GREEN:
 477                     gl_attribList[p++] = GLX_GREEN_SIZE;
 478                     gl_attribList[p++] = wx_attribList[arg++];
 479                     break;
 480                 case WX_GL_MIN_BLUE:
 481                     gl_attribList[p++] = GLX_BLUE_SIZE;
 482                     gl_attribList[p++] = wx_attribList[arg++];
 483                     break;
 484                 case WX_GL_MIN_ALPHA:
 485                     gl_attribList[p++] = GLX_ALPHA_SIZE;
 486                     gl_attribList[p++] = wx_attribList[arg++];
 487                     break;
 488                 case WX_GL_DEPTH_SIZE:
 489                     gl_attribList[p++] = GLX_DEPTH_SIZE;
 490                     gl_attribList[p++] = wx_attribList[arg++];
 491                     break;
 492                 case WX_GL_STENCIL_SIZE:
 493                     gl_attribList[p++] = GLX_STENCIL_SIZE;
 494                     gl_attribList[p++] = wx_attribList[arg++];
 495                     break;
 496                 case WX_GL_MIN_ACCUM_RED:
 497                     gl_attribList[p++] = GLX_ACCUM_RED_SIZE;
 498                     gl_attribList[p++] = wx_attribList[arg++];
 499                     break;
 500                 case WX_GL_MIN_ACCUM_GREEN:
 501                     gl_attribList[p++] = GLX_ACCUM_GREEN_SIZE;
 502                     gl_attribList[p++] = wx_attribList[arg++];
 503                     break;
 504                 case WX_GL_MIN_ACCUM_BLUE:
 505                     gl_attribList[p++] = GLX_ACCUM_BLUE_SIZE;
 506                     gl_attribList[p++] = wx_attribList[arg++];
 507                     break;
 508                 case WX_GL_MIN_ACCUM_ALPHA:
 509                     gl_attribList[p++] = GLX_ACCUM_ALPHA_SIZE;
 510                     gl_attribList[p++] = wx_attribList[arg++];
 511                     break;
 512                 default:
 513                     break;
 514             }
 515         }
 516
 517         gl_attribList[p] = 0;
 518     }
 519 }
 520
 521 void wxGLCanvas::QueryGLXVersion()
 522 {
 523     if (m_glxVersion == 0)
 524     {
 525         // check the GLX version
 526         int glxMajorVer, glxMinorVer;
 527         bool ok = glXQueryVersion(GDK_DISPLAY(), &glxMajorVer, &glxMinorVer);
 528         wxASSERT_MSG( ok, _T("GLX version not found") );
 529         if (!ok)
 530             m_glxVersion = 10; // 1.0 by default
 531         else
 532             m_glxVersion = glxMajorVer*10 + glxMinorVer;
 533     }
 534 }
 535
 536 int wxGLCanvas::GetGLXVersion()
 537 {
 538     wxASSERT_MSG( m_glxVersion>0, _T("GLX version has not been initialized with wxGLCanvas::QueryGLXVersion()") );
 539     return m_glxVersion;
 540 }
 541
 542
 543 void wxGLCanvas::SwapBuffers()
 544 {
 545     GdkWindow *window = GTK_PIZZA(m_wxwindow)->bin_window;
 546     glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
 547 }
 548
 549 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 550 {
 551 }
 552
 553 void wxGLCanvas::SetCurrent(const wxGLContext& RC) const
 554 {
 555     RC.SetCurrent(*this);
 556 }
 557
 558 void wxGLCanvas::SetCurrent()
 559 {
 560     if (m_glContext)
 561         m_glContext->SetCurrent(*this);
 562 }
 563
 564 void wxGLCanvas::SetColour( const wxChar *colour )
 565 {
 566     wxColour col = wxTheColourDatabase->Find(colour);
 567     if (col.Ok())
 568     {
 569         float r = (float)(col.Red()/256.0);
 570         float g = (float)(col.Green()/256.0);
 571         float b = (float)(col.Blue()/256.0);
 572         glColor3f( r, g, b);
 573     }
 574 }
 575
 576 void wxGLCanvas::OnInternalIdle()
 577 {
 578     if (/*m_glContext &&*/ m_exposed)
 579     {
 580         wxPaintEvent event( GetId() );
 581         event.SetEventObject( this );
 582         GetEventHandler()->ProcessEvent( event );
 583
 584         m_exposed = false;
 585         GetUpdateRegion().Clear();
 586     }
 587
 588     wxWindow::OnInternalIdle();
 589 }
 590
 591
 592
 593 //---------------------------------------------------------------------------
 594 // wxGLApp
 595 //---------------------------------------------------------------------------
 596
 597 IMPLEMENT_CLASS(wxGLApp, wxApp)
 598
 599 wxGLApp::~wxGLApp()
 600 {
 601     if (m_glFBCInfo)
 602         XFree(m_glFBCInfo);
 603     if (m_glVisualInfo)
 604         XFree(m_glVisualInfo);
 605 }
 606
 607 bool wxGLApp::InitGLVisual(int *attribList)
 608 {
 609     wxGLCanvas::QueryGLXVersion();
 610
 611     if (wxGLCanvas::GetGLXVersion() >= 13)
 612     {
 613         // GLX >= 1.3
 614         if (m_glFBCInfo)
 615             XFree(m_glFBCInfo);
 616         m_glFBCInfo = wxGLCanvas::ChooseGLFBC(attribList);
 617
 618         if (m_glFBCInfo)
 619         {
 620             if (m_glVisualInfo)
 621                 XFree(m_glVisualInfo);
 622             m_glVisualInfo = glXGetVisualFromFBConfig(GDK_DISPLAY(), ((GLXFBConfig *)m_glFBCInfo)[0]);
 623         }
 624         return (m_glFBCInfo != NULL) && (m_glVisualInfo != NULL);
 625     }
 626     else
 627     {
 628         // GLX <= 1.2
 629         if (m_glVisualInfo)
 630             XFree(m_glVisualInfo);
 631         m_glVisualInfo = wxGLCanvas::ChooseGLVisual(attribList);
 632         return m_glVisualInfo != NULL;
 633     }
 634 }
 635
 636 #endif
 637     // wxUSE_GLCANVAS