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[wxWidgets.git] / src / msw / glcanvas.cpp
diff --git a/src/msw/glcanvas.cpp b/src/msw/glcanvas.cpp
index 312b94dbd0e7acef92b90c9b075a93c9b6bdbf78..b7035b4cd9386a3aa5fd03f2a6e4a0414b19ed9a 100644 (file)
--- a/src/msw/glcanvas.cpp
+++ b/src/msw/glcanvas.cpp
@@ -9,34 +9,108 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma implementation "glcanvas.h"
-#endif
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
 
 #include "wx/wxprec.h"
 
 #if defined(__BORLANDC__)
 
 #include "wx/wxprec.h"
 
 #if defined(__BORLANDC__)
-#pragma hdrstop
+    #pragma hdrstop
 #endif
 
 #if wxUSE_GLCANVAS
 
 #ifndef WX_PRECOMP
 #endif
 
 #if wxUSE_GLCANVAS
 
 #ifndef WX_PRECOMP
-    #include "wx/frame.h"
-    #include "wx/settings.h"
     #include "wx/intl.h"
     #include "wx/log.h"
     #include "wx/app.h"
     #include "wx/intl.h"
     #include "wx/log.h"
     #include "wx/app.h"
+    #include "wx/module.h"
 #endif
 
 #include "wx/msw/private.h"
 
 #endif
 
 #include "wx/msw/private.h"
 
-// DLL options compatibility check:
-#include "wx/build.h"
-WX_CHECK_BUILD_OPTIONS("wxGL")
-
 #include "wx/glcanvas.h"
 
 #include "wx/glcanvas.h"
 
+// from src/msw/window.cpp
+LRESULT WXDLLEXPORT APIENTRY _EXPORT wxWndProc(HWND hWnd, UINT message,
+                                   WPARAM wParam, LPARAM lParam);
+
+#ifdef GL_EXT_vertex_array
+    #define WXUNUSED_WITHOUT_GL_EXT_vertex_array(name) name
+#else
+    #define WXUNUSED_WITHOUT_GL_EXT_vertex_array(name) WXUNUSED(name)
+#endif
+
+// ----------------------------------------------------------------------------
+// define possibly missing WGL constants
+// ----------------------------------------------------------------------------
+
+#ifndef WGL_ARB_pixel_format
+#define WGL_NUMBER_PIXEL_FORMATS_ARB      0x2000
+#define WGL_DRAW_TO_WINDOW_ARB            0x2001
+#define WGL_DRAW_TO_BITMAP_ARB            0x2002
+#define WGL_ACCELERATION_ARB              0x2003
+#define WGL_NEED_PALETTE_ARB              0x2004
+#define WGL_NEED_SYSTEM_PALETTE_ARB       0x2005
+#define WGL_SWAP_LAYER_BUFFERS_ARB        0x2006
+#define WGL_SWAP_METHOD_ARB               0x2007
+#define WGL_NUMBER_OVERLAYS_ARB           0x2008
+#define WGL_NUMBER_UNDERLAYS_ARB          0x2009
+#define WGL_TRANSPARENT_ARB               0x200A
+#define WGL_TRANSPARENT_RED_VALUE_ARB     0x2037
+#define WGL_TRANSPARENT_GREEN_VALUE_ARB   0x2038
+#define WGL_TRANSPARENT_BLUE_VALUE_ARB    0x2039
+#define WGL_TRANSPARENT_ALPHA_VALUE_ARB   0x203A
+#define WGL_TRANSPARENT_INDEX_VALUE_ARB   0x203B
+#define WGL_SHARE_DEPTH_ARB               0x200C
+#define WGL_SHARE_STENCIL_ARB             0x200D
+#define WGL_SHARE_ACCUM_ARB               0x200E
+#define WGL_SUPPORT_GDI_ARB               0x200F
+#define WGL_SUPPORT_OPENGL_ARB            0x2010
+#define WGL_DOUBLE_BUFFER_ARB             0x2011
+#define WGL_STEREO_ARB                    0x2012
+#define WGL_PIXEL_TYPE_ARB                0x2013
+#define WGL_COLOR_BITS_ARB                0x2014
+#define WGL_RED_BITS_ARB                  0x2015
+#define WGL_RED_SHIFT_ARB                 0x2016
+#define WGL_GREEN_BITS_ARB                0x2017
+#define WGL_GREEN_SHIFT_ARB               0x2018
+#define WGL_BLUE_BITS_ARB                 0x2019
+#define WGL_BLUE_SHIFT_ARB                0x201A
+#define WGL_ALPHA_BITS_ARB                0x201B
+#define WGL_ALPHA_SHIFT_ARB               0x201C
+#define WGL_ACCUM_BITS_ARB                0x201D
+#define WGL_ACCUM_RED_BITS_ARB            0x201E
+#define WGL_ACCUM_GREEN_BITS_ARB          0x201F
+#define WGL_ACCUM_BLUE_BITS_ARB           0x2020
+#define WGL_ACCUM_ALPHA_BITS_ARB          0x2021
+#define WGL_DEPTH_BITS_ARB                0x2022
+#define WGL_STENCIL_BITS_ARB              0x2023
+#define WGL_AUX_BUFFERS_ARB               0x2024
+#define WGL_NO_ACCELERATION_ARB           0x2025
+#define WGL_GENERIC_ACCELERATION_ARB      0x2026
+#define WGL_FULL_ACCELERATION_ARB         0x2027
+#define WGL_SWAP_EXCHANGE_ARB             0x2028
+#define WGL_SWAP_COPY_ARB                 0x2029
+#define WGL_SWAP_UNDEFINED_ARB            0x202A
+#define WGL_TYPE_RGBA_ARB                 0x202B
+#define WGL_TYPE_COLORINDEX_ARB           0x202C
+#endif
+
+#ifndef WGL_ARB_multisample
+#define WGL_SAMPLE_BUFFERS_ARB            0x2041
+#define WGL_SAMPLES_ARB                   0x2042
+#endif
+
+// ----------------------------------------------------------------------------
+// libraries
+// ----------------------------------------------------------------------------
+
 /*
   The following two compiler directives are specific to the Microsoft Visual
   C++ family of compilers
 /*
   The following two compiler directives are specific to the Microsoft Visual
   C++ family of compilers
@@ -59,180 +133,184 @@ WX_CHECK_BUILD_OPTIONS("wxGL")
 #  pragma comment( lib, "glu32" )
 #endif
 
 #  pragma comment( lib, "glu32" )
 #endif
 
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
 
 static const wxChar *wxGLCanvasClassName = wxT("wxGLCanvasClass");
 static const wxChar *wxGLCanvasClassNameNoRedraw = wxT("wxGLCanvasClassNR");
 
 
 static const wxChar *wxGLCanvasClassName = wxT("wxGLCanvasClass");
 static const wxChar *wxGLCanvasClassNameNoRedraw = wxT("wxGLCanvasClassNR");
 
-LRESULT WXDLLEXPORT APIENTRY _EXPORT wxWndProc(HWND hWnd, UINT message,
-                                   WPARAM wParam, LPARAM lParam);
+// ============================================================================
+// implementation
+// ============================================================================
 
 
-/*
- * GLContext implementation
- */
+// ----------------------------------------------------------------------------
+// wxGLModule is responsible for unregistering wxGLCanvasClass Windows class
+// ----------------------------------------------------------------------------
 
 
-wxGLContext::wxGLContext(bool WXUNUSED(isRGB), wxGLCanvas *win, const wxPalette& WXUNUSED(palette))
+class wxGLModule : public wxModule
 {
 {
-  m_window = win;
+public:
+    bool OnInit() { return true; }
+    void OnExit() { UnregisterClasses(); }
 
 
-  m_hDC = win->GetHDC();
+    // register the GL classes if not done yet, return true if ok, false if
+    // registration failed
+    static bool RegisterClasses();
 
 
-  m_glContext = wglCreateContext((HDC) m_hDC);
-  wxCHECK_RET( m_glContext, wxT("Couldn't create OpenGL context") );
+    // unregister the classes, done automatically on program termination
+    static void UnregisterClasses();
 
 
-  wglMakeCurrent((HDC) m_hDC, m_glContext);
-}
+private:
+    // wxGLCanvas is only used from the main thread so this is MT-ok
+    static bool ms_registeredGLClasses;
 
 
-wxGLContext::wxGLContext(
-               bool WXUNUSED(isRGB), wxGLCanvas *win,
-               const wxPalette& WXUNUSED(palette),
-               const wxGLContext *other  /* for sharing display lists */
-             )
+    DECLARE_DYNAMIC_CLASS(wxGLModule)
+};
+
+IMPLEMENT_DYNAMIC_CLASS(wxGLModule, wxModule)
+
+bool wxGLModule::ms_registeredGLClasses = false;
+
+/* static */
+bool wxGLModule::RegisterClasses()
 {
 {
-  m_window = win;
+    if ( ms_registeredGLClasses )
+        return true;
+
+    // We have to register a special window class because we need the CS_OWNDC
+    // style for GLCanvas: some OpenGL drivers are buggy and don't work with
+    // windows without this style
+    WNDCLASS wndclass;
+
+    // the fields which are common to all classes
+    wndclass.lpfnWndProc   = (WNDPROC)wxWndProc;
+    wndclass.cbClsExtra    = 0;
+    wndclass.cbWndExtra    = sizeof( DWORD ); // VZ: what is this DWORD used for?
+    wndclass.hInstance     = wxhInstance;
+    wndclass.hIcon         = (HICON) NULL;
+    wndclass.hCursor       = ::LoadCursor((HINSTANCE)NULL, IDC_ARROW);
+    wndclass.lpszMenuName  = NULL;
+
+    // Register the GLCanvas class name
+    wndclass.hbrBackground = (HBRUSH)NULL;
+    wndclass.lpszClassName = wxGLCanvasClassName;
+    wndclass.style         = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS | CS_OWNDC;
+
+    if ( !::RegisterClass(&wndclass) )
+    {
+        wxLogLastError(wxT("RegisterClass(wxGLCanvasClass)"));
+        return false;
+    }
+
+    // Register the GLCanvas class name for windows which don't do full repaint
+    // on resize
+    wndclass.lpszClassName = wxGLCanvasClassNameNoRedraw;
+    wndclass.style        &= ~(CS_HREDRAW | CS_VREDRAW);
 
 
-  m_hDC = win->GetHDC();
+    if ( !::RegisterClass(&wndclass) )
+    {
+        wxLogLastError(wxT("RegisterClass(wxGLCanvasClassNameNoRedraw)"));
 
 
-  m_glContext = wglCreateContext((HDC) m_hDC);
-  wxCHECK_RET( m_glContext, wxT("Couldn't create OpenGL context") );
+        ::UnregisterClass(wxGLCanvasClassName, wxhInstance);
+
+        return false;
+    }
 
 
-  if( other != 0 )
-    wglShareLists( other->m_glContext, m_glContext );
+    ms_registeredGLClasses = true;
 
 
-  wglMakeCurrent((HDC) m_hDC, m_glContext);
+    return true;
 }
 
 }
 
-wxGLContext::~wxGLContext()
+/* static */
+void wxGLModule::UnregisterClasses()
 {
 {
-  if (m_glContext)
-  {
-    wglMakeCurrent(NULL, NULL);
-    wglDeleteContext(m_glContext);
-  }
+    // we need to unregister the classes in case we're in a DLL which is
+    // unloaded and then loaded again because if we don't, the registration is
+    // going to fail in wxGLCanvas::Create() the next time we're loaded
+    if ( ms_registeredGLClasses )
+    {
+        ::UnregisterClass(wxGLCanvasClassName, wxhInstance);
+        ::UnregisterClass(wxGLCanvasClassNameNoRedraw, wxhInstance);
+
+        ms_registeredGLClasses = false;
+    }
 }
 
 }
 
-void wxGLContext::SwapBuffers()
+// ----------------------------------------------------------------------------
+// wxGLContext
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_CLASS(wxGLContext, wxObject)
+
+wxGLContext::wxGLContext(wxGLCanvas *win, const wxGLContext* other)
 {
 {
-  if (m_glContext)
-  {
-    wglMakeCurrent((HDC) m_hDC, m_glContext);
-    ::SwapBuffers((HDC) m_hDC);    //blits the backbuffer into DC
-  }
+    m_glContext = wglCreateContext(win->GetHDC());
+    wxCHECK_RET( m_glContext, wxT("Couldn't create OpenGL context") );
+
+    if ( other )
+    {
+        if ( !wglShareLists(other->m_glContext, m_glContext) )
+            wxLogLastError(_T("wglShareLists"));
+    }
 }
 
 }
 
-void wxGLContext::SetCurrent()
+wxGLContext::~wxGLContext()
 {
 {
-  if (m_glContext)
-  {
-    wglMakeCurrent((HDC) m_hDC, m_glContext);
-  }
-
-  /*
-  setupPixelFormat(hDC);
-  setupPalette(hDC);
-  */
+    // note that it's ok to delete the context even if it's the current one
+    wglDeleteContext(m_glContext);
 }
 
 }
 
-void wxGLContext::SetColour(const wxChar *colour)
+bool wxGLContext::SetCurrent(const wxGLCanvas& win) const
 {
 {
-    wxColour col = wxTheColourDatabase->Find(colour);
-    if (col.Ok())
+    if ( !wglMakeCurrent(win.GetHDC(), m_glContext) )
     {
     {
-        float r = (float)(col.Red()/256.0);
-        float g = (float)(col.Green()/256.0);
-        float b = (float)(col.Blue()/256.0);
-        glColor3f( r, g, b);
+        wxLogLastError(_T("wglMakeCurrent"));
+        return false;
     }
     }
+    return true;
 }
 
 }
 
-
-/*
- * wxGLCanvas implementation
- */
+// ============================================================================
+// wxGLCanvas
+// ============================================================================
 
 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 
 BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
 
 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 
 BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
-    EVT_SIZE(wxGLCanvas::OnSize)
     EVT_PALETTE_CHANGED(wxGLCanvas::OnPaletteChanged)
     EVT_QUERY_NEW_PALETTE(wxGLCanvas::OnQueryNewPalette)
 END_EVENT_TABLE()
 
     EVT_PALETTE_CHANGED(wxGLCanvas::OnPaletteChanged)
     EVT_QUERY_NEW_PALETTE(wxGLCanvas::OnQueryNewPalette)
 END_EVENT_TABLE()
 
-wxGLCanvas::wxGLCanvas(wxWindow *parent, wxWindowID id,
-    const wxPoint& pos, const wxSize& size, long style, const wxString& name,
-    int *attribList, const wxPalette& palette) : wxWindow()
-{
-  m_glContext = (wxGLContext*) NULL;
-
-  bool ret = Create(parent, id, pos, size, style, name);
-
-  if ( ret )
-  {
-    SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));
-  }
-
-  m_hDC = (WXHDC) ::GetDC((HWND) GetHWND());
-
-  SetupPixelFormat(attribList);
-  SetupPalette(palette);
+// ----------------------------------------------------------------------------
+// wxGLCanvas construction
+// ----------------------------------------------------------------------------
 
 
-  m_glContext = new wxGLContext(TRUE, this, palette);
-}
-
-wxGLCanvas::wxGLCanvas( wxWindow *parent,
-              const wxGLContext *shared, wxWindowID id,
-              const wxPoint& pos, const wxSize& size, long style, const wxString& name,
-              int *attribList, const wxPalette& palette )
-  : wxWindow()
+void wxGLCanvas::Init()
 {
 {
-  m_glContext = (wxGLContext*) NULL;
-
-  bool ret = Create(parent, id, pos, size, style, name);
-
-  if ( ret )
-  {
-    SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));
-  }
-
-  m_hDC = (WXHDC) ::GetDC((HWND) GetHWND());
-
-  SetupPixelFormat(attribList);
-  SetupPalette(palette);
-
-  m_glContext = new wxGLContext(TRUE, this, palette, shared );
+#if WXWIN_COMPATIBILITY_2_8
+    m_glContext = NULL;
+#endif
+    m_hDC = NULL;
 }
 
 }
 
-// Not very useful for wxMSW, but this is to be wxGTK compliant
-
-wxGLCanvas::wxGLCanvas( wxWindow *parent, const wxGLCanvas *shared, wxWindowID id,
-                        const wxPoint& pos, const wxSize& size, long style, const wxString& name,
-                        int *attribList, const wxPalette& palette ):
-  wxWindow()
+wxGLCanvas::wxGLCanvas(wxWindow *parent,
+                       wxWindowID id,
+                       const int *attribList,
+                       const wxPoint& pos,
+                       const wxSize& size,
+                       long style,
+                       const wxString& name,
+                       const wxPalette& palette)
 {
 {
-  m_glContext = (wxGLContext*) NULL;
-
-  bool ret = Create(parent, id, pos, size, style, name);
-
-  if ( ret )
-  {
-    SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));
-  }
-
-  m_hDC = (WXHDC) ::GetDC((HWND) GetHWND());
+    Init();
 
 
-  SetupPixelFormat(attribList);
-  SetupPalette(palette);
-
-  wxGLContext *sharedContext=0;
-  if (shared) sharedContext=shared->GetContext();
-  m_glContext = new wxGLContext(TRUE, this, palette, sharedContext );
+    (void)Create(parent, id, pos, size, style, name, attribList, palette);
 }
 
 wxGLCanvas::~wxGLCanvas()
 {
 }
 
 wxGLCanvas::~wxGLCanvas()
 {
-  if (m_glContext)
-    delete m_glContext;
-
-  ::ReleaseDC((HWND) GetHWND(), (HDC) m_hDC);
+    ::ReleaseDC(GetHwnd(), m_hDC);
 }
 
 // Replaces wxWindow::Create functionality, since we need to use a different
 }
 
 // Replaces wxWindow::Create functionality, since we need to use a different
@@ -242,267 +320,526 @@ bool wxGLCanvas::Create(wxWindow *parent,
                         const wxPoint& pos,
                         const wxSize& size,
                         long style,
                         const wxPoint& pos,
                         const wxSize& size,
                         long style,
-                        const wxString& name)
+                        const wxString& name,
+                        const int *attribList,
+                        const wxPalette& palette)
 {
 {
-  static bool s_registeredGLCanvasClass = FALSE;
+    wxCHECK_MSG( parent, false, wxT("can't create wxWindow without parent") );
 
 
-  // We have to register a special window class because we need
-  // the CS_OWNDC style for GLCanvas.
+    if ( !wxGLModule::RegisterClasses() )
+    {
+        wxLogError(_("Failed to register OpenGL window class."));
 
 
-  /*
-  From Angel Popov <jumpo@bitex.com>
+        return false;
+    }
 
 
-  Here are two snips from a dicussion in the OpenGL Gamedev list that explains
-  how this problem can be fixed:
+    if ( !CreateBase(parent, id, pos, size, style, wxDefaultValidator, name) )
+        return false;
 
 
-  "There are 5 common DCs available in Win95. These are aquired when you call
-  GetDC or GetDCEx from a window that does _not_ have the OWNDC flag.
-  OWNDC flagged windows do not get their DC from the common DC pool, the issue
-  is they require 800 bytes each from the limited 64Kb local heap for GDI."
+    parent->AddChild(this);
 
 
-  "The deal is, if you hold onto one of the 5 shared DC's too long (as GL apps
-  do), Win95 will actually "steal" it from you.  MakeCurrent fails,
-  apparently, because Windows re-assigns the HDC to a different window.  The
-  only way to prevent this, the only reliable means, is to set CS_OWNDC."
-  */
+    /*
+       A general rule with OpenGL and Win32 is that any window that will have a
+       HGLRC built for it must have two flags:  WS_CLIPCHILDREN & WS_CLIPSIBLINGS.
+       You can find references about this within the knowledge base and most OpenGL
+       books that contain the wgl function descriptions.
+     */
+    WXDWORD exStyle = 0;
+    DWORD msflags = WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
+    msflags |= MSWGetStyle(style, &exStyle);
 
 
-  if (!s_registeredGLCanvasClass)
-  {
-    WNDCLASS wndclass;
+    if ( !MSWCreate(wxGLCanvasClassName, NULL, pos, size, msflags, exStyle) )
+        return false;
 
 
-    // the fields which are common to all classes
-    wndclass.lpfnWndProc   = (WNDPROC)wxWndProc;
-    wndclass.cbClsExtra    = 0;
-    wndclass.cbWndExtra    = sizeof( DWORD ); // VZ: what is this DWORD used for?
-    wndclass.hInstance     = wxhInstance;
-    wndclass.hIcon         = (HICON) NULL;
-    wndclass.hCursor       = ::LoadCursor((HINSTANCE)NULL, IDC_ARROW);
-    wndclass.lpszMenuName  = NULL;
+    m_hDC = ::GetDC(GetHwnd());
+    if ( !m_hDC )
+        return false;
 
 
-    // Register the GLCanvas class name
-    wndclass.hbrBackground = (HBRUSH)NULL;
-    wndclass.lpszClassName = wxGLCanvasClassName;
-    wndclass.style         = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS | CS_OWNDC;
+    if ( !DoSetup(attribList) )
+        return false;
 
 
-    if ( !::RegisterClass(&wndclass) )
+#if wxUSE_PALETTE
+    if ( !SetupPalette(palette) )
+        return false;
+#else // !wxUSE_PALETTE
+    wxUnusedVar(palette);
+#endif // wxUSE_PALETTE/!wxUSE_PALETTE
+
+    return true;
+}
+
+// ----------------------------------------------------------------------------
+// operations
+// ----------------------------------------------------------------------------
+
+bool wxGLCanvas::SwapBuffers()
+{
+    if ( !::SwapBuffers(m_hDC) )
     {
     {
-      wxLogLastError(wxT("RegisterClass(wxGLCanvasClass)"));
-      return FALSE;
+        wxLogLastError(_T("SwapBuffers"));
+        return false;
     }
 
     }
 
-    // Register the GLCanvas class name for windows which don't do full repaint
-    // on resize
-    wndclass.lpszClassName = wxGLCanvasClassNameNoRedraw;
-    wndclass.style        &= ~(CS_HREDRAW | CS_VREDRAW);
+    return true;
+}
 
 
-    if ( !::RegisterClass(&wndclass) )
-    {
-        wxLogLastError(wxT("RegisterClass(wxGLCanvasClassNameNoRedraw)"));
 
 
-        ::UnregisterClass(wxGLCanvasClassName, wxhInstance);
+// ----------------------------------------------------------------------------
+// multi sample support
+// ----------------------------------------------------------------------------
 
 
-        return FALSE;
+// this macro defines a variable of type "name_t" called "name" and initializes
+// it with the pointer to WGL function "name" (which may be NULL)
+#define wxDEFINE_WGL_FUNC(name) \
+    name##_t name = (name##_t)wglGetProcAddress(#name)
+
+/* static */
+bool wxGLCanvasBase::IsExtensionSupported(const char *extension)
+{
+    static const char *s_extensionsList = (char *)wxUIntPtr(-1);
+    if ( s_extensionsList == (char *)wxUIntPtr(-1) )
+    {
+        typedef const char * (WINAPI *wglGetExtensionsStringARB_t)(HDC hdc);
+
+        wxDEFINE_WGL_FUNC(wglGetExtensionsStringARB);
+        if ( wglGetExtensionsStringARB )
+        {
+            s_extensionsList = wglGetExtensionsStringARB(wglGetCurrentDC());
+        }
+        else
+        {
+            typedef const char * (WINAPI * wglGetExtensionsStringEXT_t)();
+
+            wxDEFINE_WGL_FUNC(wglGetExtensionsStringEXT);
+            if ( wglGetExtensionsStringEXT )
+            {
+                s_extensionsList = wglGetExtensionsStringEXT();
+            }
+            else
+            {
+                s_extensionsList = NULL;
+            }
+        }
     }
 
     }
 
-    s_registeredGLCanvasClass = TRUE;
-  }
+    return s_extensionsList && IsExtensionInList(s_extensionsList, extension);
+}
+
+// this is a wrapper around wglChoosePixelFormatARB(): returns the pixel format
+// index matching the given attributes on success or 0 on failure
+static int ChoosePixelFormatARB(HDC hdc, const int *attribList)
+{
+    if ( !wxGLCanvas::IsExtensionSupported("WGL_ARB_multisample") )
+        return 0;
+
+    typedef BOOL (WINAPI * wglChoosePixelFormatARB_t)
+                 (HDC hdc,
+                  const int *piAttribIList,
+                  const FLOAT *pfAttribFList,
+                  UINT nMaxFormats,
+                  int *piFormats,
+                  UINT *nNumFormats
+                 );
+
+    wxDEFINE_WGL_FUNC(wglChoosePixelFormatARB);
+    if ( !wglChoosePixelFormatARB )
+        return 0; // should not occur if extension is supported
+
+    int iAttributes[128];
+    int dst = 0; // index in iAttributes array
 
 
-  wxCHECK_MSG( parent, FALSE, wxT("can't create wxWindow without parent") );
+    #define ADD_ATTR(attr, value) \
+        iAttributes[dst++] = attr; iAttributes[dst++] = value
 
 
-  if ( !CreateBase(parent, id, pos, size, style, wxDefaultValidator, name) )
-    return FALSE;
+    ADD_ATTR( WGL_DRAW_TO_WINDOW_ARB,    GL_TRUE );
+    ADD_ATTR( WGL_SUPPORT_OPENGL_ARB,    GL_TRUE );
+    ADD_ATTR( WGL_ACCELERATION_ARB,      WGL_FULL_ACCELERATION_ARB );
 
 
-  parent->AddChild(this);
+    if ( !attribList )
+    {
+        ADD_ATTR( WGL_COLOR_BITS_ARB,          24 );
+        ADD_ATTR( WGL_ALPHA_BITS_ARB,           8 );
+        ADD_ATTR( WGL_DEPTH_BITS_ARB,          16 );
+        ADD_ATTR( WGL_STENCIL_BITS_ARB,         0 );
+        ADD_ATTR( WGL_DOUBLE_BUFFER_ARB,  GL_TRUE );
+        ADD_ATTR( WGL_SAMPLE_BUFFERS_ARB, GL_TRUE );
+        ADD_ATTR( WGL_SAMPLES_ARB,              4 );
+    }
+    else // have custom attributes
+    {
+        #define ADD_ATTR_VALUE(attr) ADD_ATTR(attr, attribList[src++])
+
+        int src = 0;
+        while ( attribList[src] )
+        {
+            switch ( attribList[src++] )
+            {
+                case WX_GL_RGBA:
+                    ADD_ATTR( WGL_COLOR_BITS_ARB, 24 );
+                    ADD_ATTR( WGL_ALPHA_BITS_ARB,  8 );
+                    break;
+
+                case WX_GL_BUFFER_SIZE:
+                    ADD_ATTR_VALUE( WGL_COLOR_BITS_ARB);
+                    break;
+
+                case WX_GL_LEVEL:
+                    if ( attribList[src] > 0 )
+                    {
+                        ADD_ATTR( WGL_NUMBER_OVERLAYS_ARB, 1 );
+                    }
+                    else if ( attribList[src] <0 )
+                    {
+                        ADD_ATTR( WGL_NUMBER_UNDERLAYS_ARB, 1 );
+                    }
+                    //else: ignore it
+
+                    src++; // skip the value in any case
+                    break;
+
+                case WX_GL_DOUBLEBUFFER:
+                    ADD_ATTR( WGL_DOUBLE_BUFFER_ARB, GL_TRUE );
+                    break;
+
+                case WX_GL_STEREO:
+                    ADD_ATTR( WGL_STEREO_ARB, GL_TRUE );
+                    break;
+
+                case WX_GL_AUX_BUFFERS:
+                    ADD_ATTR_VALUE( WGL_AUX_BUFFERS_ARB );
+                    break;
+
+                case WX_GL_MIN_RED:
+                    ADD_ATTR_VALUE( WGL_RED_BITS_ARB );
+                    break;
+
+                case WX_GL_MIN_GREEN:
+                    ADD_ATTR_VALUE( WGL_GREEN_BITS_ARB );
+                    break;
+
+                case WX_GL_MIN_BLUE:
+                    ADD_ATTR_VALUE( WGL_BLUE_BITS_ARB );
+                    break;
+
+                case WX_GL_MIN_ALPHA:
+                    ADD_ATTR_VALUE( WGL_ALPHA_BITS_ARB );
+                   break;
+
+                case WX_GL_DEPTH_SIZE:
+                    ADD_ATTR_VALUE( WGL_DEPTH_BITS_ARB );
+                    break;
+
+                case WX_GL_STENCIL_SIZE:
+                    ADD_ATTR_VALUE( WGL_STENCIL_BITS_ARB );
+                    break;
+
+               case WX_GL_MIN_ACCUM_RED:
+                    ADD_ATTR_VALUE( WGL_ACCUM_RED_BITS_ARB );
+                    break;
+
+                case WX_GL_MIN_ACCUM_GREEN:
+                    ADD_ATTR_VALUE( WGL_ACCUM_GREEN_BITS_ARB );
+                    break;
+
+                case WX_GL_MIN_ACCUM_BLUE:
+                    ADD_ATTR_VALUE( WGL_ACCUM_BLUE_BITS_ARB );
+                    break;
+
+                case WX_GL_MIN_ACCUM_ALPHA:
+                    ADD_ATTR_VALUE( WGL_ACCUM_ALPHA_BITS_ARB );
+                    break;
+
+                case WX_GL_SAMPLE_BUFFERS:
+                    ADD_ATTR_VALUE( WGL_SAMPLE_BUFFERS_ARB );
+                    break;
+
+                case WX_GL_SAMPLES:
+                    ADD_ATTR_VALUE( WGL_SAMPLES_ARB );
+                    break;
+            }
+        }
+
+        #undef ADD_ATTR_VALUE
+    }
 
 
-  DWORD msflags = 0;
+    #undef ADD_ATTR
 
 
-  /*
-  A general rule with OpenGL and Win32 is that any window that will have a
-  HGLRC built for it must have two flags:  WS_CLIPCHILDREN & WS_CLIPSIBLINGS.
-  You can find references about this within the knowledge base and most OpenGL
-  books that contain the wgl function descriptions.
-  */
+    iAttributes[dst++] = 0;
 
 
-  WXDWORD exStyle = 0;
-  msflags |= WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
-  msflags |= MSWGetStyle(style, & exStyle) ;
+    int pf;
+    UINT numFormats = 0;
+    if ( !wglChoosePixelFormatARB(hdc, iAttributes, NULL, 1, &pf, &numFormats) )
+    {
+        wxLogLastError(_T("wglChoosePixelFormatARB"));
+        return 0;
+    }
 
 
-  return MSWCreate(wxGLCanvasClassName, NULL, pos, size, msflags, exStyle);
+    return pf;
 }
 
 }
 
-static void AdjustPFDForAttributes(PIXELFORMATDESCRIPTOR& pfd, int *attribList)
+// ----------------------------------------------------------------------------
+// pixel format stuff
+// ----------------------------------------------------------------------------
+
+// returns true if pfd was adjusted accordingly to attributes provided, false
+// if there is an error with attributes or -1 if the attributes indicate
+// features not supported by ChoosePixelFormat() at all (currently only multi
+// sampling)
+static int
+AdjustPFDForAttributes(PIXELFORMATDESCRIPTOR& pfd, const int *attribList)
 {
 {
-  if (attribList) {
+    if ( !attribList )
+        return 1;
+
+    // remove default attributes
     pfd.dwFlags &= ~PFD_DOUBLEBUFFER;
     pfd.iPixelType = PFD_TYPE_COLORINDEX;
     pfd.dwFlags &= ~PFD_DOUBLEBUFFER;
     pfd.iPixelType = PFD_TYPE_COLORINDEX;
-    pfd.cColorBits = 0;
-    int arg=0;
 
 
-    while( (attribList[arg]!=0) )
+    for ( int arg = 0; attribList[arg]; )
     {
     {
-      switch( attribList[arg++] )
-      {
-        case WX_GL_RGBA:
-          pfd.iPixelType = PFD_TYPE_RGBA;
-          break;
-        case WX_GL_BUFFER_SIZE:
-          pfd.cColorBits = attribList[arg++];
-          break;
-        case WX_GL_LEVEL:
-          // this member looks like it may be obsolete
-          if (attribList[arg] > 0) {
-            pfd.iLayerType = (BYTE)PFD_OVERLAY_PLANE;
-          } else if (attribList[arg] < 0) {
-            pfd.iLayerType = (BYTE)PFD_UNDERLAY_PLANE;
-          } else {
-            pfd.iLayerType = (BYTE)PFD_MAIN_PLANE;
-          }
-          arg++;
-          break;
-        case WX_GL_DOUBLEBUFFER:
-          pfd.dwFlags |= PFD_DOUBLEBUFFER;
-          break;
-        case WX_GL_STEREO:
-          pfd.dwFlags |= PFD_STEREO;
-          break;
-        case WX_GL_AUX_BUFFERS:
-          pfd.cAuxBuffers = attribList[arg++];
-          break;
-        case WX_GL_MIN_RED:
-          pfd.cColorBits += (pfd.cRedBits = attribList[arg++]);
-          break;
-        case WX_GL_MIN_GREEN:
-          pfd.cColorBits += (pfd.cGreenBits = attribList[arg++]);
-          break;
-        case WX_GL_MIN_BLUE:
-          pfd.cColorBits += (pfd.cBlueBits = attribList[arg++]);
-          break;
-        case WX_GL_MIN_ALPHA:
-          // doesn't count in cColorBits
-          pfd.cAlphaBits = attribList[arg++];
-          break;
-        case WX_GL_DEPTH_SIZE:
-          pfd.cDepthBits = attribList[arg++];
-          break;
-        case WX_GL_STENCIL_SIZE:
-          pfd.cStencilBits = attribList[arg++];
-          break;
-        case WX_GL_MIN_ACCUM_RED:
-          pfd.cAccumBits += (pfd.cAccumRedBits = attribList[arg++]);
-          break;
-        case WX_GL_MIN_ACCUM_GREEN:
-          pfd.cAccumBits += (pfd.cAccumGreenBits = attribList[arg++]);
-          break;
-        case WX_GL_MIN_ACCUM_BLUE:
-          pfd.cAccumBits += (pfd.cAccumBlueBits = attribList[arg++]);
-          break;
-        case WX_GL_MIN_ACCUM_ALPHA:
-          pfd.cAccumBits += (pfd.cAccumAlphaBits = attribList[arg++]);
-          break;
-        default:
-          break;
-      }
+        switch ( attribList[arg++] )
+        {
+            case WX_GL_RGBA:
+                pfd.iPixelType = PFD_TYPE_RGBA;
+                break;
+
+            case WX_GL_BUFFER_SIZE:
+                pfd.cColorBits = attribList[arg++];
+                break;
+
+            case WX_GL_LEVEL:
+                // this member looks like it may be obsolete
+                if ( attribList[arg] > 0 )
+                    pfd.iLayerType = PFD_OVERLAY_PLANE;
+                else if ( attribList[arg] < 0 )
+                    pfd.iLayerType = (BYTE)PFD_UNDERLAY_PLANE;
+                else
+                    pfd.iLayerType = PFD_MAIN_PLANE;
+                arg++;
+                break;
+
+            case WX_GL_DOUBLEBUFFER:
+                pfd.dwFlags |= PFD_DOUBLEBUFFER;
+                break;
+
+            case WX_GL_STEREO:
+                pfd.dwFlags |= PFD_STEREO;
+                break;
+
+            case WX_GL_AUX_BUFFERS:
+                pfd.cAuxBuffers = attribList[arg++];
+                break;
+
+            case WX_GL_MIN_RED:
+                pfd.cColorBits += (pfd.cRedBits = attribList[arg++]);
+                break;
+
+            case WX_GL_MIN_GREEN:
+                pfd.cColorBits += (pfd.cGreenBits = attribList[arg++]);
+                break;
+
+            case WX_GL_MIN_BLUE:
+                pfd.cColorBits += (pfd.cBlueBits = attribList[arg++]);
+                break;
+
+            case WX_GL_MIN_ALPHA:
+                // doesn't count in cColorBits
+                pfd.cAlphaBits = attribList[arg++];
+                break;
+
+            case WX_GL_DEPTH_SIZE:
+                pfd.cDepthBits = attribList[arg++];
+                break;
+
+            case WX_GL_STENCIL_SIZE:
+                pfd.cStencilBits = attribList[arg++];
+                break;
+
+            case WX_GL_MIN_ACCUM_RED:
+                pfd.cAccumBits += (pfd.cAccumRedBits = attribList[arg++]);
+                break;
+
+            case WX_GL_MIN_ACCUM_GREEN:
+                pfd.cAccumBits += (pfd.cAccumGreenBits = attribList[arg++]);
+                break;
+
+            case WX_GL_MIN_ACCUM_BLUE:
+                pfd.cAccumBits += (pfd.cAccumBlueBits = attribList[arg++]);
+                break;
+
+            case WX_GL_MIN_ACCUM_ALPHA:
+                pfd.cAccumBits += (pfd.cAccumAlphaBits = attribList[arg++]);
+                break;
+
+            case WX_GL_SAMPLE_BUFFERS:
+            case WX_GL_SAMPLES:
+                return -1;
+        }
     }
     }
-  }
+
+    return 1;
 }
 
 }
 
-void wxGLCanvas::SetupPixelFormat(int *attribList) // (HDC hDC)
+/* static */
+int
+wxGLCanvas::ChooseMatchingPixelFormat(HDC hdc,
+                                      const int *attribList,
+                                      PIXELFORMATDESCRIPTOR *ppfd)
 {
 {
-  PIXELFORMATDESCRIPTOR pfd = {
-        sizeof(PIXELFORMATDESCRIPTOR),    /* size */
-        1,                /* version */
+    // default neutral pixel format
+    PIXELFORMATDESCRIPTOR pfd =
+    {
+        sizeof(PIXELFORMATDESCRIPTOR),  // size
+        1,                              // version
         PFD_SUPPORT_OPENGL |
         PFD_DRAW_TO_WINDOW |
         PFD_SUPPORT_OPENGL |
         PFD_DRAW_TO_WINDOW |
-        PFD_DOUBLEBUFFER,        /* support double-buffering */
-        PFD_TYPE_RGBA,            /* color type */
-        16,                /* prefered color depth */
-        0, 0, 0, 0, 0, 0,        /* color bits (ignored) */
-        0,                /* no alpha buffer */
-        0,                /* alpha bits (ignored) */
-        0,                /* no accumulation buffer */
-        0, 0, 0, 0,            /* accum bits (ignored) */
-        16,                /* depth buffer */
-        0,                /* no stencil buffer */
-        0,                /* no auxiliary buffers */
-        PFD_MAIN_PLANE,            /* main layer */
-        0,                /* reserved */
-        0, 0, 0,            /* no layer, visible, damage masks */
+        PFD_DOUBLEBUFFER,               // use double-buffering by default
+        PFD_TYPE_RGBA,                  // default pixel type
+        0,                              // preferred color depth (don't care)
+        0, 0, 0, 0, 0, 0,               // color bits and shift bits (ignored)
+        0, 0,                           // alpha bits and shift (ignored)
+        0,                              // accumulation total bits
+        0, 0, 0, 0,                     // accumulator RGBA bits (not used)
+        16,                             // depth buffer
+        0,                              // no stencil buffer
+        0,                              // no auxiliary buffers
+        PFD_MAIN_PLANE,                 // main layer
+        0,                              // reserved
+        0, 0, 0,                        // no layer, visible, damage masks
     };
 
     };
 
-  AdjustPFDForAttributes(pfd, attribList);
+    if ( !ppfd )
+        ppfd = &pfd;
+    else
+        *ppfd = pfd;
 
 
-  int pixelFormat = ChoosePixelFormat((HDC) m_hDC, &pfd);
-  if (pixelFormat == 0) {
-    wxLogLastError(_T("ChoosePixelFormat"));
-  }
-  else {
-    if ( !::SetPixelFormat((HDC) m_hDC, pixelFormat, &pfd) ) {
-      wxLogLastError(_T("SetPixelFormat"));
+    // adjust the PFD using the provided attributes and also check if we can
+    // use PIXELFORMATDESCRIPTOR at all: if multisampling is requested, we
+    // can't as it's not supported by ChoosePixelFormat()
+    switch ( AdjustPFDForAttributes(*ppfd, attribList) )
+    {
+        case 1:
+            return ::ChoosePixelFormat(hdc, ppfd);
+
+        default:
+            wxFAIL_MSG( "unexpected AdjustPFDForAttributes() return value" );
+            // fall through
+
+        case 0:
+            // error in attributes
+            return 0;
+
+        case -1:
+            return ::ChoosePixelFormatARB(hdc, attribList);
     }
     }
-  }
 }
 
 }
 
-void wxGLCanvas::SetupPalette(const wxPalette& palette)
+/* static */
+bool wxGLCanvasBase::IsDisplaySupported(const int *attribList)
+{
+    // We need a device context to test the pixel format, so get one
+    // for the root window.
+    return wxGLCanvas::ChooseMatchingPixelFormat(ScreenHDC(), attribList) > 0;
+}
+
+bool wxGLCanvas::DoSetup(const int *attribList)
 {
 {
-    int pixelFormat = GetPixelFormat((HDC) m_hDC);
     PIXELFORMATDESCRIPTOR pfd;
     PIXELFORMATDESCRIPTOR pfd;
+    const int pixelFormat = ChooseMatchingPixelFormat(m_hDC, attribList, &pfd);
+    if ( !pixelFormat )
+    {
+        wxLogLastError(_T("ChoosePixelFormat"));
+        return false;
+    }
 
 
-    DescribePixelFormat((HDC) m_hDC, pixelFormat, sizeof(PIXELFORMATDESCRIPTOR), &pfd);
+    if ( !::SetPixelFormat(m_hDC, pixelFormat, &pfd) )
+    {
+        wxLogLastError(_T("SetPixelFormat"));
+        return false;
+    }
 
 
-    if (pfd.dwFlags & PFD_NEED_PALETTE)
+    return true;
+}
+
+// ----------------------------------------------------------------------------
+// palette stuff
+// ----------------------------------------------------------------------------
+
+#if wxUSE_PALETTE
+
+bool wxGLCanvas::SetupPalette(const wxPalette& palette)
+{
+    const int pixelFormat = ::GetPixelFormat(m_hDC);
+    if ( !pixelFormat )
     {
     {
+        wxLogLastError(_T("GetPixelFormat"));
+        return false;
     }
     }
-    else
+
+    PIXELFORMATDESCRIPTOR pfd;
+    if ( !::DescribePixelFormat(m_hDC, pixelFormat, sizeof(pfd), &pfd) )
     {
     {
-      return;
+        wxLogLastError(_T("DescribePixelFormat"));
+        return false;
     }
 
     }
 
+    if ( !(pfd.dwFlags & PFD_NEED_PALETTE) )
+        return true;
+
     m_palette = palette;
 
     if ( !m_palette.Ok() )
     {
         m_palette = CreateDefaultPalette();
     m_palette = palette;
 
     if ( !m_palette.Ok() )
     {
         m_palette = CreateDefaultPalette();
+        if ( !m_palette.Ok() )
+            return false;
     }
 
     }
 
-    if (m_palette.Ok())
+    if ( !::SelectPalette(m_hDC, GetHpaletteOf(m_palette), FALSE) )
     {
     {
-        SelectPalette((HDC) m_hDC, (HPALETTE) m_palette.GetHPALETTE(), FALSE);
-        RealizePalette((HDC) m_hDC);
+        wxLogLastError(_T("SelectPalette"));
+        return false;
     }
     }
+
+    if ( ::RealizePalette(m_hDC) == GDI_ERROR )
+    {
+        wxLogLastError(_T("RealizePalette"));
+        return false;
+    }
+
+    return true;
 }
 
 wxPalette wxGLCanvas::CreateDefaultPalette()
 {
     PIXELFORMATDESCRIPTOR pfd;
     int paletteSize;
 }
 
 wxPalette wxGLCanvas::CreateDefaultPalette()
 {
     PIXELFORMATDESCRIPTOR pfd;
     int paletteSize;
-    int pixelFormat = GetPixelFormat((HDC) m_hDC);
+    int pixelFormat = GetPixelFormat(m_hDC);
 
 
-    DescribePixelFormat((HDC) m_hDC, pixelFormat, sizeof(PIXELFORMATDESCRIPTOR), &pfd);
+    DescribePixelFormat(m_hDC, pixelFormat, sizeof(PIXELFORMATDESCRIPTOR), &pfd);
 
     paletteSize = 1 << pfd.cColorBits;
 
     LOGPALETTE* pPal =
      (LOGPALETTE*) malloc(sizeof(LOGPALETTE) + paletteSize * sizeof(PALETTEENTRY));
     pPal->palVersion = 0x300;
 
     paletteSize = 1 << pfd.cColorBits;
 
     LOGPALETTE* pPal =
      (LOGPALETTE*) malloc(sizeof(LOGPALETTE) + paletteSize * sizeof(PALETTEENTRY));
     pPal->palVersion = 0x300;
-    pPal->palNumEntries = paletteSize;
+    pPal->palNumEntries = (WORD)paletteSize;
 
     /* build a simple RGB color palette */
 
     /* build a simple RGB color palette */
-    {
     int redMask = (1 << pfd.cRedBits) - 1;
     int greenMask = (1 << pfd.cGreenBits) - 1;
     int blueMask = (1 << pfd.cBlueBits) - 1;
     int redMask = (1 << pfd.cRedBits) - 1;
     int greenMask = (1 << pfd.cGreenBits) - 1;
     int blueMask = (1 << pfd.cBlueBits) - 1;
-    int i;
 
 
-    for (i=0; i<paletteSize; ++i) {
+    for (int i=0; i<paletteSize; ++i)
+    {
         pPal->palPalEntry[i].peRed =
         pPal->palPalEntry[i].peRed =
-            (((i >> pfd.cRedShift) & redMask) * 255) / redMask;
+            (BYTE)((((i >> pfd.cRedShift) & redMask) * 255) / redMask);
         pPal->palPalEntry[i].peGreen =
         pPal->palPalEntry[i].peGreen =
-            (((i >> pfd.cGreenShift) & greenMask) * 255) / greenMask;
+            (BYTE)((((i >> pfd.cGreenShift) & greenMask) * 255) / greenMask);
         pPal->palPalEntry[i].peBlue =
         pPal->palPalEntry[i].peBlue =
-            (((i >> pfd.cBlueShift) & blueMask) * 255) / blueMask;
+            (BYTE)((((i >> pfd.cBlueShift) & blueMask) * 255) / blueMask);
         pPal->palPalEntry[i].peFlags = 0;
     }
         pPal->palPalEntry[i].peFlags = 0;
     }
-    }
 
     HPALETTE hPalette = CreatePalette(pPal);
     free(pPal);
 
     HPALETTE hPalette = CreatePalette(pPal);
     free(pPal);
@@ -513,47 +850,20 @@ wxPalette wxGLCanvas::CreateDefaultPalette()
     return palette;
 }
 
     return palette;
 }
 
-void wxGLCanvas::SwapBuffers()
-{
-  if (m_glContext)
-    m_glContext->SwapBuffers();
-}
-
-void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
-{
-}
-
-void wxGLCanvas::SetCurrent()
-{
-  if (m_glContext)
-  {
-    m_glContext->SetCurrent();
-  }
-}
-
-void wxGLCanvas::SetColour(const wxChar *colour)
-{
-  if (m_glContext)
-    m_glContext->SetColour(colour);
-}
-
-// TODO: Have to have this called by parent frame (?)
-// So we need wxFrame to call OnQueryNewPalette for all children...
 void wxGLCanvas::OnQueryNewPalette(wxQueryNewPaletteEvent& event)
 {
   /* realize palette if this is the current window */
   if ( GetPalette()->Ok() ) {
     ::UnrealizeObject((HPALETTE) GetPalette()->GetHPALETTE());
 void wxGLCanvas::OnQueryNewPalette(wxQueryNewPaletteEvent& event)
 {
   /* realize palette if this is the current window */
   if ( GetPalette()->Ok() ) {
     ::UnrealizeObject((HPALETTE) GetPalette()->GetHPALETTE());
-    ::SelectPalette((HDC) GetHDC(), (HPALETTE) GetPalette()->GetHPALETTE(), FALSE);
-    ::RealizePalette((HDC) GetHDC());
+    ::SelectPalette(GetHDC(), (HPALETTE) GetPalette()->GetHPALETTE(), FALSE);
+    ::RealizePalette(GetHDC());
     Refresh();
     Refresh();
-    event.SetPaletteRealized(TRUE);
+    event.SetPaletteRealized(true);
   }
   else
   }
   else
-    event.SetPaletteRealized(FALSE);
+    event.SetPaletteRealized(false);
 }
 
 }
 
-// I think this doesn't have to be propagated to child windows.
 void wxGLCanvas::OnPaletteChanged(wxPaletteChangedEvent& event)
 {
   /* realize palette if this is *not* the current window */
 void wxGLCanvas::OnPaletteChanged(wxPaletteChangedEvent& event)
 {
   /* realize palette if this is *not* the current window */
@@ -561,190 +871,84 @@ void wxGLCanvas::OnPaletteChanged(wxPaletteChangedEvent& event)
        GetPalette()->Ok() && (this != event.GetChangedWindow()) )
   {
     ::UnrealizeObject((HPALETTE) GetPalette()->GetHPALETTE());
        GetPalette()->Ok() && (this != event.GetChangedWindow()) )
   {
     ::UnrealizeObject((HPALETTE) GetPalette()->GetHPALETTE());
-    ::SelectPalette((HDC) GetHDC(), (HPALETTE) GetPalette()->GetHPALETTE(), FALSE);
-    ::RealizePalette((HDC) GetHDC());
+    ::SelectPalette(GetHDC(), (HPALETTE) GetPalette()->GetHPALETTE(), FALSE);
+    ::RealizePalette(GetHDC());
     Refresh();
   }
 }
 
     Refresh();
   }
 }
 
-/* Give extensions proper function names. */
-
-/* EXT_vertex_array */
-void glArrayElementEXT(GLint WXUNUSED(i))
-{
-}
-
-void glColorPointerEXT(GLint WXUNUSED(size), GLenum WXUNUSED(type), GLsizei WXUNUSED(stride), GLsizei WXUNUSED(count), const GLvoid *WXUNUSED(pointer))
-{
-}
-
-void glDrawArraysEXT(GLenum mode, GLint first, GLsizei count)
-{
-#ifdef GL_EXT_vertex_array
-    static PFNGLDRAWARRAYSEXTPROC proc = 0;
-
-    if ( !proc )
-    {
-        proc = (PFNGLDRAWARRAYSEXTPROC) wglGetProcAddress("glDrawArraysEXT");
-    }
-
-    if ( proc )
-        (* proc) (mode, first, count);
-#endif
-}
-
-void glEdgeFlagPointerEXT(GLsizei WXUNUSED(stride), GLsizei WXUNUSED(count), const GLboolean *WXUNUSED(pointer))
-{
-}
-
-void glGetPointervEXT(GLenum WXUNUSED(pname), GLvoid* *WXUNUSED(params))
-{
-}
-
-void glIndexPointerEXT(GLenum WXUNUSED(type), GLsizei WXUNUSED(stride), GLsizei WXUNUSED(count), const GLvoid *WXUNUSED(pointer))
-{
-}
-
-void glNormalPointerEXT(GLenum type, GLsizei stride, GLsizei count, const GLvoid *pointer)
-{
-#ifdef GL_EXT_vertex_array
-  static PFNGLNORMALPOINTEREXTPROC proc = 0;
-
-  if ( !proc )
-  {
-    proc = (PFNGLNORMALPOINTEREXTPROC) wglGetProcAddress("glNormalPointerEXT");
-  }
-
-  if ( proc )
-    (* proc) (type, stride, count, pointer);
-#endif
-}
-
-void glTexCoordPointerEXT(GLint WXUNUSED(size), GLenum WXUNUSED(type), GLsizei WXUNUSED(stride), GLsizei WXUNUSED(count), const GLvoid *WXUNUSED(pointer))
-{
-}
-
-void glVertexPointerEXT(GLint size, GLenum type, GLsizei stride, GLsizei count, const GLvoid *pointer)
-{
-#ifdef GL_EXT_vertex_array
-  static PFNGLVERTEXPOINTEREXTPROC proc = 0;
-
-  if ( !proc )
-  {
-    proc = (PFNGLVERTEXPOINTEREXTPROC) wglGetProcAddress("glVertexPointerEXT");
-  }
-  if ( proc )
-    (* proc) (size, type, stride, count, pointer);
-#endif
-}
-
-/* EXT_color_subtable */
-void glColorSubtableEXT(GLenum WXUNUSED(target), GLsizei WXUNUSED(start), GLsizei WXUNUSED(count), GLenum WXUNUSED(format), GLenum WXUNUSED(type), const GLvoid *WXUNUSED(table))
-{
-}
-
-/* EXT_color_table */
-void glColorTableEXT(GLenum WXUNUSED(target), GLenum WXUNUSED(internalformat), GLsizei WXUNUSED(width), GLenum WXUNUSED(format), GLenum WXUNUSED(type), const GLvoid *WXUNUSED(table))
-{
-}
+#endif // wxUSE_PALETTE
 
 
-void glCopyColorTableEXT(GLenum WXUNUSED(target), GLenum WXUNUSED(internalformat), GLint WXUNUSED(x), GLint WXUNUSED(y), GLsizei WXUNUSED(width))
-{
-}
+// ----------------------------------------------------------------------------
+// deprecated wxGLCanvas methods using implicit wxGLContext
+// ----------------------------------------------------------------------------
 
 
-void glGetColorTableEXT(GLenum WXUNUSED(target), GLenum WXUNUSED(format), GLenum WXUNUSED(type), GLvoid *WXUNUSED(table))
-{
-}
+// deprecated constructors creating an implicit m_glContext
+#if WXWIN_COMPATIBILITY_2_8
 
 
-void glGetColorTableParamaterfvEXT(GLenum WXUNUSED(target), GLenum WXUNUSED(pname), GLfloat *WXUNUSED(params))
+wxGLCanvas::wxGLCanvas(wxWindow *parent,
+                       wxWindowID id,
+                       const wxPoint& pos,
+                       const wxSize& size,
+                       long style,
+                       const wxString& name,
+                       const int *attribList,
+                       const wxPalette& palette)
 {
 {
-}
+    Init();
 
 
-void glGetColorTavleParameterivEXT(GLenum WXUNUSED(target), GLenum WXUNUSED(pname), GLint *WXUNUSED(params))
-{
+    if ( Create(parent, id, pos, size, style, name, attribList, palette) )
+        m_glContext = new wxGLContext(this);
 }
 
 }
 
-/* SGI_compiled_vertex_array */
-void glLockArraysSGI(GLint WXUNUSED(first), GLsizei WXUNUSED(count))
+wxGLCanvas::wxGLCanvas(wxWindow *parent,
+                       const wxGLContext *shared,
+                       wxWindowID id,
+                       const wxPoint& pos,
+                       const wxSize& size,
+                       long style,
+                       const wxString& name,
+                       const int *attribList,
+                       const wxPalette& palette)
 {
 {
-}
+    Init();
 
 
-void glUnlockArraysSGI()
-{
+    if ( Create(parent, id, pos, size, style, name, attribList, palette) )
+        m_glContext = new wxGLContext(this, shared);
 }
 
 }
 
-
-/* SGI_cull_vertex */
-void glCullParameterdvSGI(GLenum WXUNUSED(pname), GLdouble* WXUNUSED(params))
+wxGLCanvas::wxGLCanvas(wxWindow *parent,
+                       const wxGLCanvas *shared,
+                       wxWindowID id,
+                       const wxPoint& pos,
+                       const wxSize& size,
+                       long style,
+                       const wxString& name,
+                       const int *attribList,
+                       const wxPalette& palette)
 {
 {
-}
+    Init();
 
 
-void glCullParameterfvSGI(GLenum WXUNUSED(pname), GLfloat* WXUNUSED(params))
-{
+    if ( Create(parent, id, pos, size, style, name, attribList, palette) )
+        m_glContext = new wxGLContext(this, shared ? shared->m_glContext : NULL);
 }
 
 }
 
-/* SGI_index_func */
-void glIndexFuncSGI(GLenum WXUNUSED(func), GLclampf WXUNUSED(ref))
-{
-}
+#endif // WXWIN_COMPATIBILITY_2_8
 
 
-/* SGI_index_material */
-void glIndexMaterialSGI(GLenum WXUNUSED(face), GLenum WXUNUSED(mode))
-{
-}
 
 
-/* WIN_swap_hint */
-void glAddSwapHintRectWin(GLint WXUNUSED(x), GLint WXUNUSED(y), GLsizei WXUNUSED(width), GLsizei WXUNUSED(height))
-{
-}
-
-
-//---------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
 // wxGLApp
 // wxGLApp
-//---------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
 
 
-IMPLEMENT_CLASS(wxGLApp, wxApp)
-
-bool wxGLApp::InitGLVisual(int *attribList)
+bool wxGLApp::InitGLVisual(const int *attribList)
 {
 {
-  int pixelFormat;
-  PIXELFORMATDESCRIPTOR pfd = {
-        sizeof(PIXELFORMATDESCRIPTOR),    /* size */
-        1,                /* version */
-        PFD_SUPPORT_OPENGL |
-        PFD_DRAW_TO_WINDOW |
-        PFD_DOUBLEBUFFER,        /* support double-buffering */
-        PFD_TYPE_RGBA,            /* color type */
-        16,                /* prefered color depth */
-        0, 0, 0, 0, 0, 0,        /* color bits (ignored) */
-        0,                /* no alpha buffer */
-        0,                /* alpha bits (ignored) */
-        0,                /* no accumulation buffer */
-        0, 0, 0, 0,            /* accum bits (ignored) */
-        16,                /* depth buffer */
-        0,                /* no stencil buffer */
-        0,                /* no auxiliary buffers */
-        PFD_MAIN_PLANE,            /* main layer */
-        0,                /* reserved */
-        0, 0, 0,            /* no layer, visible, damage masks */
-    };
-
-  AdjustPFDForAttributes(pfd, attribList);
-
-  // use DC for whole (root) screen, since no windows have yet been created
-  pixelFormat = ChoosePixelFormat(ScreenHDC(), &pfd);
-
-  if (pixelFormat == 0) {
-    wxLogError(_("Failed to initialize OpenGL"));
-    return FALSE;
-  }
-
-  return TRUE;
-}
+    if ( !wxGLCanvas::ChooseMatchingPixelFormat(ScreenHDC(), attribList) )
+    {
+        wxLogError(_("Failed to initialize OpenGL"));
+        return false;
+    }
 
 
-wxGLApp::~wxGLApp()
-{
+    return true;
 }
 
 }
 
-#endif
-    // wxUSE_GLCANVAS
+#endif // wxUSE_GLCANVAS
wxWidgets (Impactor)