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 #include "wx/frame.h"
  20 #include "wx/colour.h"
  21 #include "wx/module.h"
  22 #include "wx/app.h"
  23
  24 extern "C"
  25 {
  26 #include "gtk/gtk.h"
  27 #include "gdk/gdk.h"
  28 #include "gdk/gdkx.h"
  29 }
  30
  31 #include "wx/gtk/win_gtk.h"
  32
  33 // DLL options compatibility check:
  34 #include "wx/build.h"
  35 WX_CHECK_BUILD_OPTIONS("wxGL")
  36
  37
  38 //---------------------------------------------------------------------------
  39 // static variables
  40 //---------------------------------------------------------------------------
  41 int wxGLCanvas::m_glxVersion = 0;
  42
  43 //---------------------------------------------------------------------------
  44 // global data
  45 //---------------------------------------------------------------------------
  46
  47 XVisualInfo *g_vi = (XVisualInfo*) NULL;
  48 //-----------------------------------------------------------------------------
  49 // idle system
  50 //-----------------------------------------------------------------------------
  51
  52 extern void wxapp_install_idle_handler();
  53 extern bool g_isIdle;
  54
  55 //---------------------------------------------------------------------------
  56 // wxGLContext
  57 //---------------------------------------------------------------------------
  58
  59 IMPLEMENT_CLASS(wxGLContext,wxObject)
  60
  61 wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
  62 {
  63     m_window = win;
  64     m_widget = win->m_wxwindow;
  65
  66     wxGLCanvas *gc = (wxGLCanvas*) win;
  67
  68     if (wxGLCanvas::GetGLXVersion() >= 13)
  69     {
  70         // GLX >= 1.3
  71         GLXFBConfig *fbc = gc->m_fbc;
  72         wxCHECK_RET( fbc, _T("invalid GLXFBConfig for OpenGl") );
  73         m_glContext = glXCreateNewContext( GDK_DISPLAY(), fbc[0], GLX_RGBA_TYPE, None, GL_TRUE );
  74     }
  75     else
  76     {
  77         // GLX <= 1.2
  78         XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  79         wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
  80         m_glContext = glXCreateContext( GDK_DISPLAY(), vi, None, GL_TRUE );
  81     }
  82
  83     wxCHECK_RET( m_glContext, _T("Couldn't create OpenGl context") );
  84 }
  85
  86 wxGLContext::wxGLContext(
  87                bool WXUNUSED(isRGB), wxWindow *win,
  88                const wxPalette& WXUNUSED(palette),
  89                const wxGLContext *other        /* for sharing display lists */
  90 )
  91 {
  92     m_window = win;
  93     m_widget = win->m_wxwindow;
  94
  95     wxGLCanvas *gc = (wxGLCanvas*) win;
  96
  97     if (wxGLCanvas::GetGLXVersion() >= 13)
  98     {
  99         // GLX >= 1.3
 100         GLXFBConfig *fbc = gc->m_fbc;
 101         wxCHECK_RET( fbc, _T("invalid GLXFBConfig for OpenGl") );
 102         m_glContext = glXCreateNewContext( GDK_DISPLAY(), fbc[0], GLX_RGBA_TYPE,
 103                                            other ? other->m_glContext : None,
 104                                            GL_TRUE );
 105     }
 106     else
 107     {
 108         // GLX <= 1.2
 109         XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
 110         wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
 111         m_glContext = glXCreateContext( GDK_DISPLAY(), vi,
 112                                         other ? other->m_glContext : None,
 113                                         GL_TRUE );
 114     }
 115
 116     if ( !m_glContext )
 117     {
 118         wxFAIL_MSG( _T("Couldn't create OpenGl context") );
 119     }
 120 }
 121
 122 wxGLContext::~wxGLContext()
 123 {
 124     if (!m_glContext) return;
 125
 126     if (m_glContext == glXGetCurrentContext())
 127     {
 128         if (wxGLCanvas::GetGLXVersion() >= 13)
 129             // GLX >= 1.3
 130             glXMakeContextCurrent( GDK_DISPLAY(), None, None, NULL);
 131         else
 132             // GLX <= 1.2
 133             glXMakeCurrent( GDK_DISPLAY(), None, NULL);
 134     }
 135
 136     glXDestroyContext( GDK_DISPLAY(), m_glContext );
 137 }
 138
 139 void wxGLContext::SwapBuffers()
 140 {
 141     if (m_glContext)
 142     {
 143         GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
 144         glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
 145     }
 146 }
 147
 148 void wxGLContext::SetCurrent()
 149 {
 150     if (m_glContext)
 151     {
 152         GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
 153
 154         if (wxGLCanvas::GetGLXVersion() >= 13)
 155             // GLX >= 1.3
 156             glXMakeContextCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window),
 157                                    GDK_WINDOW_XWINDOW(window), m_glContext );
 158         else
 159             // GLX <= 1.2
 160             glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
 161     }
 162 }
 163
 164 void wxGLContext::SetColour(const wxChar *colour)
 165 {
 166     wxColour col = wxTheColourDatabase->Find(colour);
 167     if (col.Ok())
 168     {
 169         float r = (float)(col.Red()/256.0);
 170         float g = (float)(col.Green()/256.0);
 171         float b = (float)(col.Blue()/256.0);
 172         glColor3f( r, g, b);
 173     }
 174 }
 175
 176 void wxGLContext::SetupPixelFormat()
 177 {
 178 }
 179
 180 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 181 {
 182 }
 183
 184 wxPalette wxGLContext::CreateDefaultPalette()
 185 {
 186     return wxNullPalette;
 187 }
 188
 189 //-----------------------------------------------------------------------------
 190 // "realize" from m_wxwindow
 191 //-----------------------------------------------------------------------------
 192
 193 extern "C" {
 194 static gint
 195 gtk_glwindow_realized_callback( GtkWidget *WXUNUSED(widget), wxGLCanvas *win )
 196 {
 197     if ( !win->m_glContext )
 198     {
 199         wxGLContext *share = win->m_sharedContext;
 200         if ( !share && win->m_sharedContextOf )
 201             share = win->m_sharedContextOf->GetContext();
 202
 203         win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, share );
 204     }
 205
 206     return FALSE;
 207 }
 208 }
 209
 210 //-----------------------------------------------------------------------------
 211 // "map" from m_wxwindow
 212 //-----------------------------------------------------------------------------
 213
 214 extern "C" {
 215 static gint
 216 gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 217 {
 218     if (win->m_glContext/* && win->m_exposed*/)
 219     {
 220         wxPaintEvent event( win->GetId() );
 221         event.SetEventObject( win );
 222         win->GetEventHandler()->ProcessEvent( event );
 223
 224         win->m_exposed = FALSE;
 225         win->GetUpdateRegion().Clear();
 226     }
 227
 228     return FALSE;
 229 }
 230 }
 231
 232 //-----------------------------------------------------------------------------
 233 // "expose_event" of m_wxwindow
 234 //-----------------------------------------------------------------------------
 235
 236 extern "C" {
 237 static void
 238 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
 239 {
 240     if (g_isIdle)
 241         wxapp_install_idle_handler();
 242
 243     win->m_exposed = TRUE;
 244
 245     win->GetUpdateRegion().Union( gdk_event->area.x,
 246                                   gdk_event->area.y,
 247                                   gdk_event->area.width,
 248                                   gdk_event->area.height );
 249 }
 250 }
 251
 252 //-----------------------------------------------------------------------------
 253 // "size_allocate" of m_wxwindow
 254 //-----------------------------------------------------------------------------
 255
 256 extern "C" {
 257 static void
 258 gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxGLCanvas *win )
 259 {
 260     if (g_isIdle)
 261         wxapp_install_idle_handler();
 262
 263     if (!win->m_hasVMT)
 264         return;
 265
 266     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
 267     event.SetEventObject( win );
 268     win->GetEventHandler()->ProcessEvent( event );
 269 }
 270 }
 271
 272 //---------------------------------------------------------------------------
 273 // wxGlCanvas
 274 //---------------------------------------------------------------------------
 275
 276 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 277
 278 BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
 279     EVT_SIZE(wxGLCanvas::OnSize)
 280 END_EVENT_TABLE()
 281
 282 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 283                         const wxPoint& pos, const wxSize& size,
 284                         long style, const wxString& name,
 285                         int *attribList,
 286                         const wxPalette& palette )
 287 {
 288     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 289 }
 290
 291 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 292                         const wxGLContext *shared,
 293                         wxWindowID id,
 294                         const wxPoint& pos, const wxSize& size,
 295                         long style, const wxString& name,
 296                         int *attribList,
 297                         const wxPalette& palette )
 298 {
 299     Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
 300 }
 301
 302 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 303                         const wxGLCanvas *shared,
 304                         wxWindowID id,
 305                         const wxPoint& pos, const wxSize& size,
 306                         long style, const wxString& name,
 307                         int *attribList,
 308                         const wxPalette& palette )
 309 {
 310     Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
 311 }
 312
 313 bool wxGLCanvas::Create( wxWindow *parent,
 314                          const wxGLContext *shared,
 315                          const wxGLCanvas *shared_context_of,
 316                          wxWindowID id,
 317                          const wxPoint& pos, const wxSize& size,
 318                          long style, const wxString& name,
 319                          int *attribList,
 320                          const wxPalette& palette)
 321 {
 322     m_sharedContext = (wxGLContext*)shared;  // const_cast
 323     m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
 324     m_glContext = (wxGLContext*) NULL;
 325
 326     m_exposed = FALSE;
 327     m_noExpose = TRUE;
 328     m_nativeSizeEvent = TRUE;
 329     m_fbc = NULL;
 330     m_vi = NULL;
 331
 332     // to be sure the glx version is known
 333     wxGLCanvas::QueryGLXVersion();
 334
 335     if (wxGLCanvas::GetGLXVersion() >= 13)
 336     {
 337         // GLX >= 1.3 uses a GLXFBConfig
 338         GLXFBConfig * fbc = NULL;
 339         if (wxTheApp->m_glFBCInfo != NULL)
 340         {
 341             fbc = (GLXFBConfig *) wxTheApp->m_glFBCInfo;
 342             m_canFreeFBC = FALSE; // owned by wxTheApp - don't free upon destruction
 343         }
 344         else
 345         {
 346             fbc = (GLXFBConfig *) wxGLCanvas::ChooseGLFBC(attribList);
 347             m_canFreeFBC = TRUE;
 348         }
 349         m_fbc = fbc;  // save for later use
 350         wxCHECK_MSG( m_fbc, FALSE, _T("required FBConfig couldn't be found") );
 351     }
 352
 353     XVisualInfo *vi = NULL;
 354     if (wxTheApp->m_glVisualInfo != NULL)
 355     {
 356         vi = (XVisualInfo *)wxTheApp->m_glVisualInfo;
 357         m_canFreeVi = FALSE; // owned by wxTheApp - don't free upon destruction
 358     }
 359     else
 360     {
 361         if (wxGLCanvas::GetGLXVersion() >= 13)
 362         // GLX >= 1.3
 363             vi = glXGetVisualFromFBConfig(GDK_DISPLAY(), m_fbc[0]);
 364         else
 365             // GLX <= 1.2
 366             vi = (XVisualInfo *) ChooseGLVisual(attribList);
 367
 368         m_canFreeVi = TRUE;
 369     }
 370
 371     m_vi = vi;  // save for later use
 372
 373     wxCHECK_MSG( m_vi, FALSE, _T("required visual couldn't be found") );
 374     GdkVisual *visual;
 375     GdkColormap *colormap;
 376
 377     // MR: This needs a fix for lower gtk+ versions too. Might need to rethink logic (FIXME)
 378 #if defined(__WXGTK20__) && GTK_CHECK_VERSION(2,2,0)
 379     if (!gtk_check_version(2,2,0))
 380     {
 381         wxWindow::Create( parent, id, pos, size, style, name );
 382
 383         m_glWidget = m_wxwindow;
 384
 385         GdkScreen *screen = gtk_widget_get_screen( m_glWidget );
 386         colormap = gdk_screen_get_default_colormap(screen);
 387         visual = gdk_colormap_get_visual(colormap);
 388
 389         if (GDK_VISUAL_XVISUAL(visual)->visualid != vi->visualid)
 390         {
 391             visual = gdk_x11_screen_lookup_visual( screen, vi->visualid );
 392             colormap = gdk_colormap_new(visual, FALSE);
 393         }
 394
 395         gtk_widget_set_colormap( m_glWidget, colormap );
 396     }
 397     else
 398 #endif
 399     {
 400         visual = gdkx_visual_get( vi->visualid );
 401         colormap = gdk_colormap_new( visual, TRUE );
 402
 403         gtk_widget_push_colormap( colormap );
 404         gtk_widget_push_visual( visual );
 405
 406         wxWindow::Create( parent, id, pos, size, style, name );
 407         m_glWidget = m_wxwindow;
 408     }
 409
 410     gtk_widget_set_double_buffered( m_glWidget, FALSE );
 411
 412     gtk_pizza_set_clear( GTK_PIZZA(m_wxwindow), FALSE );
 413
 414     g_signal_connect (m_wxwindow, "realize",
 415                       G_CALLBACK (gtk_glwindow_realized_callback),
 416                       this);
 417     g_signal_connect (m_wxwindow, "map",
 418                       G_CALLBACK (gtk_glwindow_map_callback),
 419                       this);
 420     g_signal_connect (m_wxwindow, "expose_event",
 421                       G_CALLBACK (gtk_glwindow_expose_callback),
 422                       this);
 423     g_signal_connect (m_widget, "size_allocate",
 424                       G_CALLBACK (gtk_glcanvas_size_callback),
 425                       this);
 426
 427     if (gtk_check_version(2,2,0) != NULL)
 428     {
 429         gtk_widget_pop_visual();
 430         gtk_widget_pop_colormap();
 431     }
 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)
 449         XFree( fbc );
 450
 451     XVisualInfo *vi = (XVisualInfo *) m_vi;
 452     if (vi && m_canFreeVi)
 453         XFree( vi );
 454
 455     delete m_glContext;
 456 }
 457
 458 void* wxGLCanvas::ChooseGLVisual(int *attribList)
 459 {
 460     int data[512];
 461     GetGLAttribListFromWX( attribList, data );
 462     attribList = (int*) data;
 463
 464     Display *dpy = GDK_DISPLAY();
 465
 466     return glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 467 }
 468
 469 void* wxGLCanvas::ChooseGLFBC(int *attribList)
 470 {
 471     int data[512];
 472     GetGLAttribListFromWX( attribList, data );
 473     attribList = (int*) data;
 474
 475     int returned;
 476     return glXChooseFBConfig( GDK_DISPLAY(), DefaultScreen(GDK_DISPLAY()),
 477                               attribList, &returned );
 478 }
 479
 480
 481 void wxGLCanvas::GetGLAttribListFromWX(int *wx_attribList, int *gl_attribList )
 482 {
 483     if (!wx_attribList)
 484     {
 485         if (wxGLCanvas::GetGLXVersion() >= 13)
 486         // leave GLX >= 1.3 choose the default attributes
 487             gl_attribList[0] = 0;
 488         else
 489         {
 490             int i = 0;
 491             // default settings if attriblist = 0
 492             gl_attribList[i++] = GLX_RGBA;
 493             gl_attribList[i++] = GLX_DOUBLEBUFFER;
 494             gl_attribList[i++] = GLX_DEPTH_SIZE;   gl_attribList[i++] = 1;
 495             gl_attribList[i++] = GLX_RED_SIZE;     gl_attribList[i++] = 1;
 496             gl_attribList[i++] = GLX_GREEN_SIZE;   gl_attribList[i++] = 1;
 497             gl_attribList[i++] = GLX_BLUE_SIZE;    gl_attribList[i++] = 1;
 498             gl_attribList[i++] = GLX_ALPHA_SIZE;   gl_attribList[i++] = 0;
 499             gl_attribList[i++] = None;
 500         }
 501     }
 502     else
 503     {
 504         int arg=0, p=0;
 505         while( (wx_attribList[arg]!=0) && (p<510) )
 506         {
 507             switch( wx_attribList[arg++] )
 508             {
 509                 case WX_GL_RGBA:
 510                     if (wxGLCanvas::GetGLXVersion() <= 12)
 511                         // for GLX >= 1.3, GLX_RGBA is useless (setting this flags will crash on most opengl implm)
 512                         gl_attribList[p++] = GLX_RGBA;
 513                     break;
 514                 case WX_GL_BUFFER_SIZE:
 515                     gl_attribList[p++] = GLX_BUFFER_SIZE;
 516                     gl_attribList[p++] = wx_attribList[arg++];
 517                     break;
 518                 case WX_GL_LEVEL:
 519                     gl_attribList[p++] = GLX_LEVEL;
 520                     gl_attribList[p++] = wx_attribList[arg++];
 521                     break;
 522                 case WX_GL_DOUBLEBUFFER:
 523                     if (wxGLCanvas::GetGLXVersion() <= 12)
 524                         gl_attribList[p++] = GLX_DOUBLEBUFFER;
 525                     else
 526                         // for GLX >= 1.3, GLX_DOUBLEBUFFER format is different (1 <=> True)
 527                         // it seems this flag is useless for some hardware opengl implementation.
 528                         // but for Mesa 6.2.1, this flag is used so don't ignore it.
 529                         gl_attribList[p++] = GLX_DOUBLEBUFFER;
 530                     gl_attribList[p++] = 1;
 531                     break;
 532                 case WX_GL_STEREO:
 533                     gl_attribList[p++] = GLX_STEREO;
 534                     break;
 535                 case WX_GL_AUX_BUFFERS:
 536                     gl_attribList[p++] = GLX_AUX_BUFFERS;
 537                     gl_attribList[p++] = wx_attribList[arg++];
 538                     break;
 539                 case WX_GL_MIN_RED:
 540                     gl_attribList[p++] = GLX_RED_SIZE;
 541                     gl_attribList[p++] = wx_attribList[arg++];
 542                     break;
 543                 case WX_GL_MIN_GREEN:
 544                     gl_attribList[p++] = GLX_GREEN_SIZE;
 545                     gl_attribList[p++] = wx_attribList[arg++];
 546                     break;
 547                 case WX_GL_MIN_BLUE:
 548                     gl_attribList[p++] = GLX_BLUE_SIZE;
 549                     gl_attribList[p++] = wx_attribList[arg++];
 550                     break;
 551                 case WX_GL_MIN_ALPHA:
 552                     gl_attribList[p++] = GLX_ALPHA_SIZE;
 553                     gl_attribList[p++] = wx_attribList[arg++];
 554                     break;
 555                 case WX_GL_DEPTH_SIZE:
 556                     gl_attribList[p++] = GLX_DEPTH_SIZE;
 557                     gl_attribList[p++] = wx_attribList[arg++];
 558                     break;
 559                 case WX_GL_STENCIL_SIZE:
 560                     gl_attribList[p++] = GLX_STENCIL_SIZE;
 561                     gl_attribList[p++] = wx_attribList[arg++];
 562                     break;
 563                 case WX_GL_MIN_ACCUM_RED:
 564                     gl_attribList[p++] = GLX_ACCUM_RED_SIZE;
 565                     gl_attribList[p++] = wx_attribList[arg++];
 566                     break;
 567                 case WX_GL_MIN_ACCUM_GREEN:
 568                     gl_attribList[p++] = GLX_ACCUM_GREEN_SIZE;
 569                     gl_attribList[p++] = wx_attribList[arg++];
 570                     break;
 571                 case WX_GL_MIN_ACCUM_BLUE:
 572                     gl_attribList[p++] = GLX_ACCUM_BLUE_SIZE;
 573                     gl_attribList[p++] = wx_attribList[arg++];
 574                     break;
 575                 case WX_GL_MIN_ACCUM_ALPHA:
 576                     gl_attribList[p++] = GLX_ACCUM_ALPHA_SIZE;
 577                     gl_attribList[p++] = wx_attribList[arg++];
 578                     break;
 579                 default:
 580                     break;
 581             }
 582         }
 583
 584         gl_attribList[p] = 0;
 585     }
 586 }
 587
 588 void wxGLCanvas::QueryGLXVersion()
 589 {
 590     if (m_glxVersion == 0)
 591     {
 592         // check the GLX version
 593         int glxMajorVer, glxMinorVer;
 594         bool ok = glXQueryVersion(GDK_DISPLAY(), &glxMajorVer, &glxMinorVer);
 595         wxASSERT_MSG( ok, _T("GLX version not found") );
 596         if (!ok)
 597             m_glxVersion = 10; // 1.0 by default
 598         else
 599             m_glxVersion = glxMajorVer*10 + glxMinorVer;
 600     }
 601 }
 602
 603 int wxGLCanvas::GetGLXVersion()
 604 {
 605     wxASSERT_MSG( m_glxVersion>0, _T("GLX version has not been initialized with wxGLCanvas::QueryGLXVersion()") );
 606     return m_glxVersion;
 607 }
 608
 609
 610 void wxGLCanvas::SwapBuffers()
 611 {
 612     if (m_glContext)
 613         m_glContext->SwapBuffers();
 614 }
 615
 616 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 617 {
 618 }
 619
 620 void wxGLCanvas::SetCurrent()
 621 {
 622     if (m_glContext)
 623         m_glContext->SetCurrent();
 624 }
 625
 626 void wxGLCanvas::SetColour( const wxChar *colour )
 627 {
 628     if (m_glContext)
 629         m_glContext->SetColour( colour );
 630 }
 631
 632 void wxGLCanvas::OnInternalIdle()
 633 {
 634     if (m_glContext && m_exposed)
 635     {
 636         wxPaintEvent event( GetId() );
 637         event.SetEventObject( this );
 638         GetEventHandler()->ProcessEvent( event );
 639
 640         m_exposed = FALSE;
 641         GetUpdateRegion().Clear();
 642     }
 643
 644     wxWindow::OnInternalIdle();
 645 }
 646
 647
 648
 649 //---------------------------------------------------------------------------
 650 // wxGLApp
 651 //---------------------------------------------------------------------------
 652
 653 IMPLEMENT_CLASS(wxGLApp, wxApp)
 654
 655 wxGLApp::~wxGLApp()
 656 {
 657     if (m_glFBCInfo)
 658         XFree(m_glFBCInfo);
 659     if (m_glVisualInfo)
 660         XFree(m_glVisualInfo);
 661 }
 662
 663 bool wxGLApp::InitGLVisual(int *attribList)
 664 {
 665     wxGLCanvas::QueryGLXVersion();
 666
 667     if (wxGLCanvas::GetGLXVersion() >= 13)
 668     {
 669         // GLX >= 1.3
 670         if (m_glFBCInfo)
 671             XFree(m_glFBCInfo);
 672         m_glFBCInfo = wxGLCanvas::ChooseGLFBC(attribList);
 673
 674         if (m_glFBCInfo)
 675         {
 676             if (m_glVisualInfo)
 677                 XFree(m_glVisualInfo);
 678             m_glVisualInfo = glXGetVisualFromFBConfig(GDK_DISPLAY(), ((GLXFBConfig *)m_glFBCInfo)[0]);
 679         }
 680         return (m_glFBCInfo != NULL) && (m_glVisualInfo != NULL);
 681     }
 682     else
 683     {
 684         // GLX <= 1.2
 685         if (m_glVisualInfo)
 686             XFree(m_glVisualInfo);
 687         m_glVisualInfo = wxGLCanvas::ChooseGLVisual(attribList);
 688         return m_glVisualInfo != NULL;
 689     }
 690 }
 691
 692 #endif
 693     // wxUSE_GLCANVAS