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 void
 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 }
 181 }
 182
 183 //-----------------------------------------------------------------------------
 184 // "size_allocate" of m_wxwindow
 185 //-----------------------------------------------------------------------------
 186
 187 extern "C" {
 188 static void
 189 gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxGLCanvas *win )
 190 {
 191     if (g_isIdle)
 192         wxapp_install_idle_handler();
 193
 194     if (!win->m_hasVMT)
 195         return;
 196
 197     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
 198     event.SetEventObject( win );
 199     win->GetEventHandler()->ProcessEvent( event );
 200 }
 201 }
 202
 203 //---------------------------------------------------------------------------
 204 // wxGlCanvas
 205 //---------------------------------------------------------------------------
 206
 207 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 208
 209 BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
 210     EVT_SIZE(wxGLCanvas::OnSize)
 211 END_EVENT_TABLE()
 212
 213 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 214                         int *attribList,
 215                         const wxPoint& pos, const wxSize& size,
 216                         long style, const wxString& name,
 217                         const wxPalette& palette )
 218     : m_createImplicitContext(false)
 219 {
 220     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 221 }
 222
 223 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 224                         const wxPoint& pos, const wxSize& size,
 225                         long style, const wxString& name,
 226                         int *attribList,
 227                         const wxPalette& palette )
 228     : m_createImplicitContext(true)
 229 {
 230     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 231 }
 232
 233 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 234                         const wxGLContext *shared,
 235                         wxWindowID id,
 236                         const wxPoint& pos, const wxSize& size,
 237                         long style, const wxString& name,
 238                         int *attribList,
 239                         const wxPalette& palette )
 240     : m_createImplicitContext(true)
 241 {
 242     Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
 243 }
 244
 245 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 246                         const wxGLCanvas *shared,
 247                         wxWindowID id,
 248                         const wxPoint& pos, const wxSize& size,
 249                         long style, const wxString& name,
 250                         int *attribList,
 251                         const wxPalette& palette )
 252     : m_createImplicitContext(true)
 253 {
 254     Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
 255 }
 256
 257 bool wxGLCanvas::Create( wxWindow *parent,
 258                          const wxGLContext *shared,
 259                          const wxGLCanvas *shared_context_of,
 260                          wxWindowID id,
 261                          const wxPoint& pos, const wxSize& size,
 262                          long style, const wxString& name,
 263                          int *attribList,
 264                          const wxPalette& palette)
 265 {
 266     m_sharedContext = (wxGLContext*)shared;  // const_cast
 267     m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
 268     m_glContext = (wxGLContext*) NULL;
 269
 270     m_exposed = false;
 271     m_noExpose = true;
 272     m_nativeSizeEvent = true;
 273     m_fbc = NULL;
 274     m_vi = NULL;
 275
 276     // to be sure the glx version is known
 277     wxGLCanvas::QueryGLXVersion();
 278
 279     if (wxGLCanvas::GetGLXVersion() >= 13)
 280     {
 281         // GLX >= 1.3 uses a GLXFBConfig
 282         GLXFBConfig * fbc = NULL;
 283         if (wxTheApp->m_glFBCInfo != NULL)
 284         {
 285             fbc = (GLXFBConfig *) wxTheApp->m_glFBCInfo;
 286             m_canFreeFBC = false; // owned by wxTheApp - don't free upon destruction
 287         }
 288         else
 289         {
 290             fbc = (GLXFBConfig *) wxGLCanvas::ChooseGLFBC(attribList);
 291             m_canFreeFBC = true;
 292         }
 293         m_fbc = fbc;  // save for later use
 294         wxCHECK_MSG( m_fbc, false, _T("required FBConfig couldn't be found") );
 295     }
 296
 297     XVisualInfo *vi = NULL;
 298     if (wxTheApp->m_glVisualInfo != NULL)
 299     {
 300         vi = (XVisualInfo *)wxTheApp->m_glVisualInfo;
 301         m_canFreeVi = false; // owned by wxTheApp - don't free upon destruction
 302     }
 303     else
 304     {
 305         if (wxGLCanvas::GetGLXVersion() >= 13)
 306         // GLX >= 1.3
 307             vi = glXGetVisualFromFBConfig(GDK_DISPLAY(), m_fbc[0]);
 308         else
 309             // GLX <= 1.2
 310             vi = (XVisualInfo *) ChooseGLVisual(attribList);
 311
 312         m_canFreeVi = true;
 313     }
 314
 315     m_vi = vi;  // save for later use
 316
 317     wxCHECK_MSG( m_vi, false, _T("required visual couldn't be found") );
 318     GdkVisual *visual;
 319     GdkColormap *colormap;
 320
 321     // MR: This needs a fix for lower gtk+ versions too. Might need to rethink logic (FIXME)
 322 #if defined(__WXGTK20__) && GTK_CHECK_VERSION(2,2,0)
 323     if (!gtk_check_version(2,2,0))
 324     {
 325         wxWindow::Create( parent, id, pos, size, style, name );
 326
 327         m_glWidget = m_wxwindow;
 328
 329         GdkScreen *screen = gtk_widget_get_screen( m_glWidget );
 330         colormap = gdk_screen_get_default_colormap(screen);
 331         visual = gdk_colormap_get_visual(colormap);
 332
 333         if (GDK_VISUAL_XVISUAL(visual)->visualid != vi->visualid)
 334         {
 335             visual = gdk_x11_screen_lookup_visual( screen, vi->visualid );
 336             colormap = gdk_colormap_new(visual, FALSE);
 337         }
 338
 339         gtk_widget_set_colormap( m_glWidget, colormap );
 340     }
 341     else
 342 #endif
 343     {
 344         visual = gdkx_visual_get( vi->visualid );
 345         colormap = gdk_colormap_new( visual, TRUE );
 346
 347         gtk_widget_push_colormap( colormap );
 348
 349         wxWindow::Create( parent, id, pos, size, style, name );
 350         m_glWidget = m_wxwindow;
 351     }
 352
 353     gtk_widget_set_double_buffered( m_glWidget, FALSE );
 354
 355     g_signal_connect(m_wxwindow, "realize",       G_CALLBACK(gtk_glwindow_realized_callback), this);
 356     g_signal_connect(m_wxwindow, "map",           G_CALLBACK(gtk_glwindow_map_callback),      this);
 357     g_signal_connect(m_wxwindow, "expose_event",  G_CALLBACK(gtk_glwindow_expose_callback),   this);
 358     g_signal_connect(m_widget,   "size_allocate", G_CALLBACK(gtk_glcanvas_size_callback),     this);
 359
 360     if (gtk_check_version(2,2,0) != NULL)
 361     {
 362         gtk_widget_pop_colormap();
 363     }
 364
 365     // if our parent window is already visible, we had been realized before we
 366     // connected to the "realize" signal and hence our m_glContext hasn't been
 367     // initialized yet and we have to do it now
 368     if (GTK_WIDGET_REALIZED(m_wxwindow))
 369         gtk_glwindow_realized_callback( m_wxwindow, this );
 370
 371     if (GTK_WIDGET_MAPPED(m_wxwindow))
 372         gtk_glwindow_map_callback( m_wxwindow, this );
 373
 374     return true;
 375 }
 376
 377 wxGLCanvas::~wxGLCanvas()
 378 {
 379     GLXFBConfig * fbc = (GLXFBConfig *) m_fbc;
 380     if (fbc && m_canFreeFBC)
 381         XFree( fbc );
 382
 383     XVisualInfo *vi = (XVisualInfo *) m_vi;
 384     if (vi && m_canFreeVi)
 385         XFree( vi );
 386
 387     delete m_glContext;
 388 }
 389
 390 void* wxGLCanvas::ChooseGLVisual(int *attribList)
 391 {
 392     int data[512];
 393     GetGLAttribListFromWX( attribList, data );
 394     attribList = (int*) data;
 395
 396     Display *dpy = GDK_DISPLAY();
 397
 398     return glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 399 }
 400
 401 void* wxGLCanvas::ChooseGLFBC(int *attribList)
 402 {
 403     int data[512];
 404     GetGLAttribListFromWX( attribList, data );
 405     attribList = (int*) data;
 406
 407     int returned;
 408     return glXChooseFBConfig( GDK_DISPLAY(), DefaultScreen(GDK_DISPLAY()),
 409                               attribList, &returned );
 410 }
 411
 412
 413 void wxGLCanvas::GetGLAttribListFromWX(int *wx_attribList, int *gl_attribList )
 414 {
 415     if (!wx_attribList)
 416     {
 417         if (wxGLCanvas::GetGLXVersion() >= 13)
 418         // leave GLX >= 1.3 choose the default attributes
 419             gl_attribList[0] = 0;
 420         else
 421         {
 422             int i = 0;
 423             // default settings if attriblist = 0
 424             gl_attribList[i++] = GLX_RGBA;
 425             gl_attribList[i++] = GLX_DOUBLEBUFFER;
 426             gl_attribList[i++] = GLX_DEPTH_SIZE;   gl_attribList[i++] = 1;
 427             gl_attribList[i++] = GLX_RED_SIZE;     gl_attribList[i++] = 1;
 428             gl_attribList[i++] = GLX_GREEN_SIZE;   gl_attribList[i++] = 1;
 429             gl_attribList[i++] = GLX_BLUE_SIZE;    gl_attribList[i++] = 1;
 430             gl_attribList[i++] = GLX_ALPHA_SIZE;   gl_attribList[i++] = 0;
 431             gl_attribList[i++] = None;
 432         }
 433     }
 434     else
 435     {
 436         int arg=0, p=0;
 437         while( (wx_attribList[arg]!=0) && (p<510) )
 438         {
 439             switch( wx_attribList[arg++] )
 440             {
 441                 case WX_GL_RGBA:
 442                     if (wxGLCanvas::GetGLXVersion() <= 12)
 443                         // for GLX >= 1.3, GLX_RGBA is useless (setting this flags will crash on most opengl implm)
 444                         gl_attribList[p++] = GLX_RGBA;
 445                     break;
 446                 case WX_GL_BUFFER_SIZE:
 447                     gl_attribList[p++] = GLX_BUFFER_SIZE;
 448                     gl_attribList[p++] = wx_attribList[arg++];
 449                     break;
 450                 case WX_GL_LEVEL:
 451                     gl_attribList[p++] = GLX_LEVEL;
 452                     gl_attribList[p++] = wx_attribList[arg++];
 453                     break;
 454                 case WX_GL_DOUBLEBUFFER:
 455                     if (wxGLCanvas::GetGLXVersion() <= 12)
 456                         gl_attribList[p++] = GLX_DOUBLEBUFFER;
 457                     else
 458                         // for GLX >= 1.3, GLX_DOUBLEBUFFER format is different (1 <=> True)
 459                         // it seems this flag is useless for some hardware opengl implementation.
 460                         // but for Mesa 6.2.1, this flag is used so don't ignore it.
 461                         gl_attribList[p++] = GLX_DOUBLEBUFFER;
 462                     gl_attribList[p++] = 1;
 463                     break;
 464                 case WX_GL_STEREO:
 465                     gl_attribList[p++] = GLX_STEREO;
 466                     break;
 467                 case WX_GL_AUX_BUFFERS:
 468                     gl_attribList[p++] = GLX_AUX_BUFFERS;
 469                     gl_attribList[p++] = wx_attribList[arg++];
 470                     break;
 471                 case WX_GL_MIN_RED:
 472                     gl_attribList[p++] = GLX_RED_SIZE;
 473                     gl_attribList[p++] = wx_attribList[arg++];
 474                     break;
 475                 case WX_GL_MIN_GREEN:
 476                     gl_attribList[p++] = GLX_GREEN_SIZE;
 477                     gl_attribList[p++] = wx_attribList[arg++];
 478                     break;
 479                 case WX_GL_MIN_BLUE:
 480                     gl_attribList[p++] = GLX_BLUE_SIZE;
 481                     gl_attribList[p++] = wx_attribList[arg++];
 482                     break;
 483                 case WX_GL_MIN_ALPHA:
 484                     gl_attribList[p++] = GLX_ALPHA_SIZE;
 485                     gl_attribList[p++] = wx_attribList[arg++];
 486                     break;
 487                 case WX_GL_DEPTH_SIZE:
 488                     gl_attribList[p++] = GLX_DEPTH_SIZE;
 489                     gl_attribList[p++] = wx_attribList[arg++];
 490                     break;
 491                 case WX_GL_STENCIL_SIZE:
 492                     gl_attribList[p++] = GLX_STENCIL_SIZE;
 493                     gl_attribList[p++] = wx_attribList[arg++];
 494                     break;
 495                 case WX_GL_MIN_ACCUM_RED:
 496                     gl_attribList[p++] = GLX_ACCUM_RED_SIZE;
 497                     gl_attribList[p++] = wx_attribList[arg++];
 498                     break;
 499                 case WX_GL_MIN_ACCUM_GREEN:
 500                     gl_attribList[p++] = GLX_ACCUM_GREEN_SIZE;
 501                     gl_attribList[p++] = wx_attribList[arg++];
 502                     break;
 503                 case WX_GL_MIN_ACCUM_BLUE:
 504                     gl_attribList[p++] = GLX_ACCUM_BLUE_SIZE;
 505                     gl_attribList[p++] = wx_attribList[arg++];
 506                     break;
 507                 case WX_GL_MIN_ACCUM_ALPHA:
 508                     gl_attribList[p++] = GLX_ACCUM_ALPHA_SIZE;
 509                     gl_attribList[p++] = wx_attribList[arg++];
 510                     break;
 511                 default:
 512                     break;
 513             }
 514         }
 515
 516         gl_attribList[p] = 0;
 517     }
 518 }
 519
 520 void wxGLCanvas::QueryGLXVersion()
 521 {
 522     if (m_glxVersion == 0)
 523     {
 524         // check the GLX version
 525         int glxMajorVer, glxMinorVer;
 526         bool ok = glXQueryVersion(GDK_DISPLAY(), &glxMajorVer, &glxMinorVer);
 527         wxASSERT_MSG( ok, _T("GLX version not found") );
 528         if (!ok)
 529             m_glxVersion = 10; // 1.0 by default
 530         else
 531             m_glxVersion = glxMajorVer*10 + glxMinorVer;
 532     }
 533 }
 534
 535 int wxGLCanvas::GetGLXVersion()
 536 {
 537     wxASSERT_MSG( m_glxVersion>0, _T("GLX version has not been initialized with wxGLCanvas::QueryGLXVersion()") );
 538     return m_glxVersion;
 539 }
 540
 541
 542 void wxGLCanvas::SwapBuffers()
 543 {
 544     GdkWindow *window = GTK_PIZZA(m_wxwindow)->bin_window;
 545     glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
 546 }
 547
 548 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 549 {
 550 }
 551
 552 void wxGLCanvas::SetCurrent(const wxGLContext& RC) const
 553 {
 554     RC.SetCurrent(*this);
 555 }
 556
 557 void wxGLCanvas::SetCurrent()
 558 {
 559     if (m_glContext)
 560         m_glContext->SetCurrent(*this);
 561 }
 562
 563 void wxGLCanvas::SetColour( const wxChar *colour )
 564 {
 565     wxColour col = wxTheColourDatabase->Find(colour);
 566     if (col.Ok())
 567     {
 568         float r = (float)(col.Red()/256.0);
 569         float g = (float)(col.Green()/256.0);
 570         float b = (float)(col.Blue()/256.0);
 571         glColor3f( r, g, b);
 572     }
 573 }
 574
 575 void wxGLCanvas::OnInternalIdle()
 576 {
 577     if (/*m_glContext &&*/ m_exposed)
 578     {
 579         wxPaintEvent event( GetId() );
 580         event.SetEventObject( this );
 581         GetEventHandler()->ProcessEvent( event );
 582
 583         m_exposed = false;
 584         GetUpdateRegion().Clear();
 585     }
 586
 587     wxWindow::OnInternalIdle();
 588 }
 589
 590
 591
 592 //---------------------------------------------------------------------------
 593 // wxGLApp
 594 //---------------------------------------------------------------------------
 595
 596 IMPLEMENT_CLASS(wxGLApp, wxApp)
 597
 598 wxGLApp::~wxGLApp()
 599 {
 600     if (m_glFBCInfo)
 601         XFree(m_glFBCInfo);
 602     if (m_glVisualInfo)
 603         XFree(m_glVisualInfo);
 604 }
 605
 606 bool wxGLApp::InitGLVisual(int *attribList)
 607 {
 608     wxGLCanvas::QueryGLXVersion();
 609
 610     if (wxGLCanvas::GetGLXVersion() >= 13)
 611     {
 612         // GLX >= 1.3
 613         if (m_glFBCInfo)
 614             XFree(m_glFBCInfo);
 615         m_glFBCInfo = wxGLCanvas::ChooseGLFBC(attribList);
 616
 617         if (m_glFBCInfo)
 618         {
 619             if (m_glVisualInfo)
 620                 XFree(m_glVisualInfo);
 621             m_glVisualInfo = glXGetVisualFromFBConfig(GDK_DISPLAY(), ((GLXFBConfig *)m_glFBCInfo)[0]);
 622         }
 623         return (m_glFBCInfo != NULL) && (m_glVisualInfo != NULL);
 624     }
 625     else
 626     {
 627         // GLX <= 1.2
 628         if (m_glVisualInfo)
 629             XFree(m_glVisualInfo);
 630         m_glVisualInfo = wxGLCanvas::ChooseGLVisual(attribList);
 631         return m_glVisualInfo != NULL;
 632     }
 633 }
 634
 635 #endif
 636     // wxUSE_GLCANVAS