src/gtk1/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),
 163                                    GDK_WINDOW_XWINDOW(window), m_glContext );
 164         else
 165             // GLX <= 1.2
 166             glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
 167     }
 168 }
 169
 170 void wxGLContext::SetColour(const wxChar *colour)
 171 {
 172     wxColour col = wxTheColourDatabase->Find(colour);
 173     if (col.Ok())
 174     {
 175         float r = (float)(col.Red()/256.0);
 176         float g = (float)(col.Green()/256.0);
 177         float b = (float)(col.Blue()/256.0);
 178         glColor3f( r, g, b);
 179     }
 180 }
 181
 182 void wxGLContext::SetupPixelFormat()
 183 {
 184 }
 185
 186 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 187 {
 188 }
 189
 190 wxPalette wxGLContext::CreateDefaultPalette()
 191 {
 192     return wxNullPalette;
 193 }
 194
 195 //-----------------------------------------------------------------------------
 196 // "realize" from m_wxwindow
 197 //-----------------------------------------------------------------------------
 198
 199 extern "C" {
 200 static gint
 201 gtk_glwindow_realized_callback( GtkWidget *WXUNUSED(widget), wxGLCanvas *win )
 202 {
 203     if ( !win->m_glContext )
 204     {
 205         wxGLContext *share = win->m_sharedContext;
 206         if ( !share && win->m_sharedContextOf )
 207             share = win->m_sharedContextOf->GetContext();
 208
 209         win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, share );
 210     }
 211
 212     return FALSE;
 213 }
 214 }
 215
 216 //-----------------------------------------------------------------------------
 217 // "map" from m_wxwindow
 218 //-----------------------------------------------------------------------------
 219
 220 extern "C" {
 221 static gint
 222 gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 223 {
 224     if (win->m_glContext/* && win->m_exposed*/)
 225     {
 226         wxPaintEvent event( win->GetId() );
 227         event.SetEventObject( win );
 228         win->GetEventHandler()->ProcessEvent( event );
 229
 230         win->m_exposed = FALSE;
 231         win->GetUpdateRegion().Clear();
 232     }
 233
 234     return FALSE;
 235 }
 236 }
 237
 238 //-----------------------------------------------------------------------------
 239 // "expose_event" of m_wxwindow
 240 //-----------------------------------------------------------------------------
 241
 242 extern "C" {
 243 static void
 244 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
 245 {
 246     if (g_isIdle)
 247         wxapp_install_idle_handler();
 248
 249     win->m_exposed = TRUE;
 250
 251     win->GetUpdateRegion().Union( gdk_event->area.x,
 252                                   gdk_event->area.y,
 253                                   gdk_event->area.width,
 254                                   gdk_event->area.height );
 255 }
 256 }
 257
 258 //-----------------------------------------------------------------------------
 259 // "draw" of m_wxwindow
 260 //-----------------------------------------------------------------------------
 261
 262 #ifndef __WXGTK20__
 263 extern "C" {
 264 static void
 265 gtk_glwindow_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxGLCanvas *win )
 266 {
 267     if (g_isIdle)
 268         wxapp_install_idle_handler();
 269
 270     win->m_exposed = TRUE;
 271
 272     win->GetUpdateRegion().Union( rect->x, rect->y,
 273                                   rect->width, rect->height );
 274 }
 275 }
 276 #endif
 277
 278 //-----------------------------------------------------------------------------
 279 // "size_allocate" of m_wxwindow
 280 //-----------------------------------------------------------------------------
 281
 282 extern "C" {
 283 static void
 284 gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxGLCanvas *win )
 285 {
 286     if (g_isIdle)
 287         wxapp_install_idle_handler();
 288
 289     if (!win->m_hasVMT)
 290         return;
 291
 292     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
 293     event.SetEventObject( win );
 294     win->GetEventHandler()->ProcessEvent( event );
 295 }
 296 }
 297
 298 //---------------------------------------------------------------------------
 299 // wxGlCanvas
 300 //---------------------------------------------------------------------------
 301
 302 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 303
 304 BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
 305     EVT_SIZE(wxGLCanvas::OnSize)
 306 END_EVENT_TABLE()
 307
 308 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 309                         const wxPoint& pos, const wxSize& size,
 310                         long style, const wxString& name,
 311                         int *attribList,
 312                         const wxPalette& palette )
 313 {
 314     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 315 }
 316
 317 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 318                         const wxGLContext *shared,
 319                         wxWindowID id,
 320                         const wxPoint& pos, const wxSize& size,
 321                         long style, const wxString& name,
 322                         int *attribList,
 323                         const wxPalette& palette )
 324 {
 325     Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
 326 }
 327
 328 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 329                         const wxGLCanvas *shared,
 330                         wxWindowID id,
 331                         const wxPoint& pos, const wxSize& size,
 332                         long style, const wxString& name,
 333                         int *attribList,
 334                         const wxPalette& palette )
 335 {
 336     Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
 337 }
 338
 339 bool wxGLCanvas::Create( wxWindow *parent,
 340                          const wxGLContext *shared,
 341                          const wxGLCanvas *shared_context_of,
 342                          wxWindowID id,
 343                          const wxPoint& pos, const wxSize& size,
 344                          long style, const wxString& name,
 345                          int *attribList,
 346                          const wxPalette& palette)
 347 {
 348     m_sharedContext = (wxGLContext*)shared;  // const_cast
 349     m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
 350     m_glContext = (wxGLContext*) NULL;
 351
 352     m_exposed = FALSE;
 353     m_noExpose = TRUE;
 354     m_nativeSizeEvent = TRUE;
 355     m_fbc = NULL;
 356     m_vi = NULL;
 357
 358     // to be sure the glx version is known
 359     wxGLCanvas::QueryGLXVersion();
 360
 361     if (wxGLCanvas::GetGLXVersion() >= 13)
 362     {
 363         // GLX >= 1.3 uses a GLXFBConfig
 364         GLXFBConfig * fbc = NULL;
 365         if (wxTheApp->m_glFBCInfo != NULL)
 366         {
 367             fbc = (GLXFBConfig *) wxTheApp->m_glFBCInfo;
 368             m_canFreeFBC = FALSE; // owned by wxTheApp - don't free upon destruction
 369         }
 370         else
 371         {
 372             fbc = (GLXFBConfig *) wxGLCanvas::ChooseGLFBC(attribList);
 373             m_canFreeFBC = TRUE;
 374         }
 375         m_fbc = fbc;  // save for later use
 376         wxCHECK_MSG( m_fbc, FALSE, _T("required FBConfig couldn't be found") );
 377     }
 378
 379     XVisualInfo *vi = NULL;
 380     if (wxTheApp->m_glVisualInfo != NULL)
 381     {
 382         vi = (XVisualInfo *)wxTheApp->m_glVisualInfo;
 383         m_canFreeVi = FALSE; // owned by wxTheApp - don't free upon destruction
 384     }
 385     else
 386     {
 387         if (wxGLCanvas::GetGLXVersion() >= 13)
 388         // GLX >= 1.3
 389             vi = glXGetVisualFromFBConfig(GDK_DISPLAY(), m_fbc[0]);
 390         else
 391             // GLX <= 1.2
 392             vi = (XVisualInfo *) ChooseGLVisual(attribList);
 393
 394         m_canFreeVi = TRUE;
 395     }
 396
 397     m_vi = vi;  // save for later use
 398
 399     wxCHECK_MSG( m_vi, FALSE, _T("required visual couldn't be found") );
 400     GdkVisual *visual;
 401     GdkColormap *colormap;
 402
 403     // MR: This needs a fix for lower gtk+ versions too. Might need to rethink logic (FIXME)
 404 #if defined(__WXGTK20__) && GTK_CHECK_VERSION(2,2,0)
 405     if (!gtk_check_version(2,2,0))
 406     {
 407         wxWindow::Create( parent, id, pos, size, style, name );
 408
 409         m_glWidget = m_wxwindow;
 410
 411         GdkScreen *screen = gtk_widget_get_screen( m_glWidget );
 412         colormap = gdk_screen_get_default_colormap(screen);
 413         visual = gdk_colormap_get_visual(colormap);
 414
 415         if (GDK_VISUAL_XVISUAL(visual)->visualid != vi->visualid)
 416         {
 417             visual = gdk_x11_screen_lookup_visual( screen, vi->visualid );
 418             colormap = gdk_colormap_new(visual, FALSE);
 419         }
 420
 421         gtk_widget_set_colormap( m_glWidget, colormap );
 422     }
 423     else
 424 #endif
 425     {
 426         visual = gdkx_visual_get( vi->visualid );
 427         colormap = gdk_colormap_new( visual, TRUE );
 428
 429         gtk_widget_push_colormap( colormap );
 430         gtk_widget_push_visual( visual );
 431
 432         wxWindow::Create( parent, id, pos, size, style, name );
 433         m_glWidget = m_wxwindow;
 434     }
 435
 436 #ifdef __WXGTK20__
 437     gtk_widget_set_double_buffered( m_glWidget, FALSE );
 438 #endif
 439
 440     gtk_pizza_set_clear( GTK_PIZZA(m_wxwindow), FALSE );
 441
 442     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "realize",
 443                             GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
 444
 445     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "map",
 446                             GTK_SIGNAL_FUNC(gtk_glwindow_map_callback), (gpointer) this );
 447
 448     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "expose_event",
 449         GTK_SIGNAL_FUNC(gtk_glwindow_expose_callback), (gpointer)this );
 450
 451 #ifndef __WXGTK20__
 452     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "draw",
 453         GTK_SIGNAL_FUNC(gtk_glwindow_draw_callback), (gpointer)this );
 454 #endif
 455
 456     gtk_signal_connect( GTK_OBJECT(m_widget), "size_allocate",
 457         GTK_SIGNAL_FUNC(gtk_glcanvas_size_callback), (gpointer)this );
 458
 459 #ifdef __WXGTK20__
 460     if (gtk_check_version(2,2,0) != NULL)
 461 #endif
 462     {
 463         gtk_widget_pop_visual();
 464         gtk_widget_pop_colormap();
 465     }
 466
 467     // if our parent window is already visible, we had been realized before we
 468     // connected to the "realize" signal and hence our m_glContext hasn't been
 469     // initialized yet and we have to do it now
 470     if (GTK_WIDGET_REALIZED(m_wxwindow))
 471         gtk_glwindow_realized_callback( m_wxwindow, this );
 472
 473     if (GTK_WIDGET_MAPPED(m_wxwindow))
 474         gtk_glwindow_map_callback( m_wxwindow, this );
 475
 476     return TRUE;
 477 }
 478
 479 wxGLCanvas::~wxGLCanvas()
 480 {
 481     GLXFBConfig * fbc = (GLXFBConfig *) m_fbc;
 482     if (fbc && m_canFreeFBC)
 483         XFree( fbc );
 484
 485     XVisualInfo *vi = (XVisualInfo *) m_vi;
 486     if (vi && m_canFreeVi)
 487         XFree( vi );
 488
 489     delete m_glContext;
 490 }
 491
 492 void* wxGLCanvas::ChooseGLVisual(int *attribList)
 493 {
 494     int data[512];
 495     GetGLAttribListFromWX( attribList, data );
 496     attribList = (int*) data;
 497
 498     Display *dpy = GDK_DISPLAY();
 499
 500     return glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 501 }
 502
 503 void* wxGLCanvas::ChooseGLFBC(int *attribList)
 504 {
 505     int data[512];
 506     GetGLAttribListFromWX( attribList, data );
 507     attribList = (int*) data;
 508
 509     int returned;
 510     return glXChooseFBConfig( GDK_DISPLAY(), DefaultScreen(GDK_DISPLAY()),
 511                               attribList, &returned );
 512 }
 513
 514
 515 void wxGLCanvas::GetGLAttribListFromWX(int *wx_attribList, int *gl_attribList )
 516 {
 517     if (!wx_attribList)
 518     {
 519         if (wxGLCanvas::GetGLXVersion() >= 13)
 520         // leave GLX >= 1.3 choose the default attributes
 521             gl_attribList[0] = 0;
 522         else
 523         {
 524             int i = 0;
 525             // default settings if attriblist = 0
 526             gl_attribList[i++] = GLX_RGBA;
 527             gl_attribList[i++] = GLX_DOUBLEBUFFER;
 528             gl_attribList[i++] = GLX_DEPTH_SIZE;   gl_attribList[i++] = 1;
 529             gl_attribList[i++] = GLX_RED_SIZE;     gl_attribList[i++] = 1;
 530             gl_attribList[i++] = GLX_GREEN_SIZE;   gl_attribList[i++] = 1;
 531             gl_attribList[i++] = GLX_BLUE_SIZE;    gl_attribList[i++] = 1;
 532             gl_attribList[i++] = GLX_ALPHA_SIZE;   gl_attribList[i++] = 0;
 533             gl_attribList[i++] = None;
 534         }
 535     }
 536     else
 537     {
 538         int arg=0, p=0;
 539         while( (wx_attribList[arg]!=0) && (p<510) )
 540         {
 541             switch( wx_attribList[arg++] )
 542             {
 543                 case WX_GL_RGBA:
 544                     if (wxGLCanvas::GetGLXVersion() <= 12)
 545                         // for GLX >= 1.3, GLX_RGBA is useless (setting this flags will crash on most opengl implm)
 546                         gl_attribList[p++] = GLX_RGBA;
 547                     break;
 548                 case WX_GL_BUFFER_SIZE:
 549                     gl_attribList[p++] = GLX_BUFFER_SIZE;
 550                     gl_attribList[p++] = wx_attribList[arg++];
 551                     break;
 552                 case WX_GL_LEVEL:
 553                     gl_attribList[p++] = GLX_LEVEL;
 554                     gl_attribList[p++] = wx_attribList[arg++];
 555                     break;
 556                 case WX_GL_DOUBLEBUFFER:
 557                     if (wxGLCanvas::GetGLXVersion() <= 12)
 558                         gl_attribList[p++] = GLX_DOUBLEBUFFER;
 559                     else
 560                         // for GLX >= 1.3, GLX_DOUBLEBUFFER format is different (1 <=> True)
 561                         // it seems this flag is useless for some hardware opengl implementation.
 562                         // but for Mesa 6.2.1, this flag is used so don't ignore it.
 563                         gl_attribList[p++] = GLX_DOUBLEBUFFER;
 564                     gl_attribList[p++] = 1;
 565                     break;
 566                 case WX_GL_STEREO:
 567                     gl_attribList[p++] = GLX_STEREO;
 568                     break;
 569                 case WX_GL_AUX_BUFFERS:
 570                     gl_attribList[p++] = GLX_AUX_BUFFERS;
 571                     gl_attribList[p++] = wx_attribList[arg++];
 572                     break;
 573                 case WX_GL_MIN_RED:
 574                     gl_attribList[p++] = GLX_RED_SIZE;
 575                     gl_attribList[p++] = wx_attribList[arg++];
 576                     break;
 577                 case WX_GL_MIN_GREEN:
 578                     gl_attribList[p++] = GLX_GREEN_SIZE;
 579                     gl_attribList[p++] = wx_attribList[arg++];
 580                     break;
 581                 case WX_GL_MIN_BLUE:
 582                     gl_attribList[p++] = GLX_BLUE_SIZE;
 583                     gl_attribList[p++] = wx_attribList[arg++];
 584                     break;
 585                 case WX_GL_MIN_ALPHA:
 586                     gl_attribList[p++] = GLX_ALPHA_SIZE;
 587                     gl_attribList[p++] = wx_attribList[arg++];
 588                     break;
 589                 case WX_GL_DEPTH_SIZE:
 590                     gl_attribList[p++] = GLX_DEPTH_SIZE;
 591                     gl_attribList[p++] = wx_attribList[arg++];
 592                     break;
 593                 case WX_GL_STENCIL_SIZE:
 594                     gl_attribList[p++] = GLX_STENCIL_SIZE;
 595                     gl_attribList[p++] = wx_attribList[arg++];
 596                     break;
 597                 case WX_GL_MIN_ACCUM_RED:
 598                     gl_attribList[p++] = GLX_ACCUM_RED_SIZE;
 599                     gl_attribList[p++] = wx_attribList[arg++];
 600                     break;
 601                 case WX_GL_MIN_ACCUM_GREEN:
 602                     gl_attribList[p++] = GLX_ACCUM_GREEN_SIZE;
 603                     gl_attribList[p++] = wx_attribList[arg++];
 604                     break;
 605                 case WX_GL_MIN_ACCUM_BLUE:
 606                     gl_attribList[p++] = GLX_ACCUM_BLUE_SIZE;
 607                     gl_attribList[p++] = wx_attribList[arg++];
 608                     break;
 609                 case WX_GL_MIN_ACCUM_ALPHA:
 610                     gl_attribList[p++] = GLX_ACCUM_ALPHA_SIZE;
 611                     gl_attribList[p++] = wx_attribList[arg++];
 612                     break;
 613                 default:
 614                     break;
 615             }
 616         }
 617
 618         gl_attribList[p] = 0;
 619     }
 620 }
 621
 622 void wxGLCanvas::QueryGLXVersion()
 623 {
 624     if (m_glxVersion == 0)
 625     {
 626         // check the GLX version
 627         int glxMajorVer, glxMinorVer;
 628         bool ok = glXQueryVersion(GDK_DISPLAY(), &glxMajorVer, &glxMinorVer);
 629         wxASSERT_MSG( ok, _T("GLX version not found") );
 630         if (!ok)
 631             m_glxVersion = 10; // 1.0 by default
 632         else
 633             m_glxVersion = glxMajorVer*10 + glxMinorVer;
 634     }
 635 }
 636
 637 int wxGLCanvas::GetGLXVersion()
 638 {
 639     wxASSERT_MSG( m_glxVersion>0, _T("GLX version has not been initialized with wxGLCanvas::QueryGLXVersion()") );
 640     return m_glxVersion;
 641 }
 642
 643
 644 void wxGLCanvas::SwapBuffers()
 645 {
 646     if (m_glContext)
 647         m_glContext->SwapBuffers();
 648 }
 649
 650 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 651 {
 652 }
 653
 654 void wxGLCanvas::SetCurrent()
 655 {
 656     if (m_glContext)
 657         m_glContext->SetCurrent();
 658 }
 659
 660 void wxGLCanvas::SetColour( const wxChar *colour )
 661 {
 662     if (m_glContext)
 663         m_glContext->SetColour( colour );
 664 }
 665
 666 void wxGLCanvas::OnInternalIdle()
 667 {
 668     if (m_glContext && m_exposed)
 669     {
 670         wxPaintEvent event( GetId() );
 671         event.SetEventObject( this );
 672         GetEventHandler()->ProcessEvent( event );
 673
 674         m_exposed = FALSE;
 675         GetUpdateRegion().Clear();
 676     }
 677
 678     wxWindow::OnInternalIdle();
 679 }
 680
 681
 682
 683 //---------------------------------------------------------------------------
 684 // wxGLApp
 685 //---------------------------------------------------------------------------
 686
 687 IMPLEMENT_CLASS(wxGLApp, wxApp)
 688
 689 wxGLApp::~wxGLApp()
 690 {
 691     if (m_glFBCInfo)
 692         XFree(m_glFBCInfo);
 693     if (m_glVisualInfo)
 694         XFree(m_glVisualInfo);
 695 }
 696
 697 bool wxGLApp::InitGLVisual(int *attribList)
 698 {
 699     wxGLCanvas::QueryGLXVersion();
 700
 701     if (wxGLCanvas::GetGLXVersion() >= 13)
 702     {
 703         // GLX >= 1.3
 704         if (m_glFBCInfo)
 705             XFree(m_glFBCInfo);
 706         m_glFBCInfo = wxGLCanvas::ChooseGLFBC(attribList);
 707
 708         if (m_glFBCInfo)
 709         {
 710             if (m_glVisualInfo)
 711                 XFree(m_glVisualInfo);
 712             m_glVisualInfo = glXGetVisualFromFBConfig(GDK_DISPLAY(), ((GLXFBConfig *)m_glFBCInfo)[0]);
 713         }
 714         return (m_glFBCInfo != NULL) && (m_glVisualInfo != NULL);
 715     }
 716     else
 717     {
 718         // GLX <= 1.2
 719         if (m_glVisualInfo)
 720             XFree(m_glVisualInfo);
 721         m_glVisualInfo = wxGLCanvas::ChooseGLVisual(attribList);
 722         return m_glVisualInfo != NULL;
 723     }
 724 }
 725
 726 #endif
 727     // wxUSE_GLCANVAS