src/unix/glx11.cpp

///////////////////////////////////////////////////////////////////////////////
// Name:        src/univ/glx11.cpp
// Purpose:     code common to all X11-based wxGLCanvas implementations
// Author:      Vadim Zeitlin
// Created:     2007-04-15
// RCS-ID:      $Id$
// Copyright:   (c) 2007 Vadim Zeitlin <vadim@wxwindows.org>
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

// for compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#if wxUSE_GLCANVAS

#ifndef WX_PRECOMP
    #include "wx/log.h"
#endif //WX_PRECOMP

#include "wx/glcanvas.h"

// ============================================================================
// wxGLContext implementation
// ============================================================================

IMPLEMENT_CLASS(wxGLContext, wxObject)

wxGLContext::wxGLContext(wxGLCanvas *gc, const wxGLContext *other)
{
    if ( wxGLCanvas::GetGLXVersion() >= 13 )
    {
        GLXFBConfig *fbc = gc->GetGLXFBConfig();
        wxCHECK_RET( fbc, _T("invalid GLXFBConfig for OpenGL") );

        m_glContext = glXCreateNewContext( wxGetX11Display(), fbc[0], GLX_RGBA_TYPE,
                                           other ? other->m_glContext : None,
                                           GL_TRUE );
    }
    else // GLX <= 1.2
    {
        XVisualInfo *vi = gc->GetXVisualInfo();
        wxCHECK_RET( vi, _T("invalid visual for OpenGL") );

        m_glContext = glXCreateContext( wxGetX11Display(), vi,
                                        other ? other->m_glContext : None,
                                        GL_TRUE );
    }

    wxASSERT_MSG( m_glContext, _T("Couldn't create OpenGL context") );
}

wxGLContext::~wxGLContext()
{
    if ( !m_glContext )
        return;

    if ( m_glContext == glXGetCurrentContext() )
        MakeCurrent(None, NULL);

    glXDestroyContext( wxGetX11Display(), m_glContext );
}

bool wxGLContext::SetCurrent(const wxGLCanvas& win) const
{
    if ( !m_glContext )
        return false;

    const Window xid = win.GetXWindow();
    wxCHECK2_MSG( xid, return false, _T("window must be shown") );

    return MakeCurrent(xid, m_glContext);
}

// wrapper around glXMakeContextCurrent/glXMakeCurrent depending on GLX
// version
/* static */
bool wxGLContext::MakeCurrent(GLXDrawable drawable, GLXContext context)
{
    if (wxGLCanvas::GetGLXVersion() >= 13)
        return glXMakeContextCurrent( wxGetX11Display(), drawable, drawable, context);
    else // GLX <= 1.2 doesn't have glXMakeContextCurrent()
        return glXMakeCurrent( wxGetX11Display(), drawable, context);
}

// ============================================================================
// wxGLCanvasX11 implementation
// ============================================================================

// ----------------------------------------------------------------------------
// initialization methods and dtor
// ----------------------------------------------------------------------------

wxGLCanvasX11::wxGLCanvasX11()
{
    m_fbc = NULL;
    m_vi = NULL;
}

bool wxGLCanvasX11::InitVisual(const int *attribList)
{
    return InitXVisualInfo(attribList, &m_fbc, &m_vi);
}

wxGLCanvasX11::~wxGLCanvasX11()
{
    if ( m_fbc && m_fbc != ms_glFBCInfo )
        XFree(m_fbc);

    if ( m_vi && m_vi != ms_glVisualInfo )
        XFree(m_vi);
}

// ----------------------------------------------------------------------------
// working with GL attributes
// ----------------------------------------------------------------------------

bool
wxGLCanvasX11::ConvertWXAttrsToGL(const int *wxattrs, int *glattrs, size_t n)
{
    wxCHECK_MSG( n >= 16, false, _T("GL attributes buffer too small") );

    if ( !wxattrs )
    {
        if ( GetGLXVersion() >= 13 )
        {
            // leave GLX >= 1.3 choose the default attributes
            glattrs[0] = None;
        }
        else // GLX < 1.3
        {
            // default settings if attriblist = 0
            size_t i = 0;
            glattrs[i++] = GLX_RGBA;
            glattrs[i++] = GLX_DOUBLEBUFFER;
            glattrs[i++] = GLX_DEPTH_SIZE;   glattrs[i++] = 1;
            glattrs[i++] = GLX_RED_SIZE;     glattrs[i++] = 1;
            glattrs[i++] = GLX_GREEN_SIZE;   glattrs[i++] = 1;
            glattrs[i++] = GLX_BLUE_SIZE;    glattrs[i++] = 1;
            glattrs[i++] = GLX_ALPHA_SIZE;   glattrs[i++] = 0;
            glattrs[i++] = None;

            wxASSERT_MSG( i < n, _T("GL attributes buffer too small") );
        }
    }
    else // have non-default attributes
    {
        size_t p = 0;
        for ( int arg = 0; wxattrs[arg] != 0; )
        {
            // check if we have any space left, knowing that we may insert 2
            // more elements during this loop iteration and we always need to
            // terminate the list with None (hence -3)
            if ( p >= n - 2 )
                return false;

            switch ( wxattrs[arg++] )
            {
                case WX_GL_RGBA:
                    // for GLX >= 1.3, GLX_RGBA is useless and apparently
                    // harmful for some implementations
                    //
                    // FIXME: is this true?
                    if ( GetGLXVersion() <= 12 )
                    {
                        glattrs[p++] = GLX_RGBA;
                    }

                    // use "continue" to skip the assignment of the attribute
                    // value at the end of the loop
                    continue;

                case WX_GL_BUFFER_SIZE:
                    glattrs[p++] = GLX_BUFFER_SIZE;
                    break;

                case WX_GL_LEVEL:
                    glattrs[p++] = GLX_LEVEL;
                    break;

                    // the following boolean attributes don't have values in wx
                    // API (they're turned on if specified) but do have them in
                    // OpenGL, so do put them into glattrs and also skip the
                    // copy of wx value after switch by using "continue"
                    // instead of "break"
                case WX_GL_DOUBLEBUFFER:
                    glattrs[p++] = GLX_DOUBLEBUFFER;
                    glattrs[p++] = True;
                    continue;

                case WX_GL_STEREO:
                    glattrs[p++] = GLX_STEREO;
                    glattrs[p++] = True;
                    continue;


                case WX_GL_AUX_BUFFERS:
                    glattrs[p++] = GLX_AUX_BUFFERS;
                    break;

                case WX_GL_MIN_RED:
                    glattrs[p++] = GLX_RED_SIZE;
                    break;

                case WX_GL_MIN_GREEN:
                    glattrs[p++] = GLX_GREEN_SIZE;
                    break;

                case WX_GL_MIN_BLUE:
                    glattrs[p++] = GLX_BLUE_SIZE;
                    break;

                case WX_GL_MIN_ALPHA:
                    glattrs[p++] = GLX_ALPHA_SIZE;
                    break;

                case WX_GL_DEPTH_SIZE:
                    glattrs[p++] = GLX_DEPTH_SIZE;
                    break;

                case WX_GL_STENCIL_SIZE:
                    glattrs[p++] = GLX_STENCIL_SIZE;
                    break;

                case WX_GL_MIN_ACCUM_RED:
                    glattrs[p++] = GLX_ACCUM_RED_SIZE;
                    break;

                case WX_GL_MIN_ACCUM_GREEN:
                    glattrs[p++] = GLX_ACCUM_GREEN_SIZE;
                    break;

                case WX_GL_MIN_ACCUM_BLUE:
                    glattrs[p++] = GLX_ACCUM_BLUE_SIZE;
                    break;

                case WX_GL_MIN_ACCUM_ALPHA:
                    glattrs[p++] = GLX_ACCUM_ALPHA_SIZE;
                    break;

                default:
                    wxLogDebug(_T("Unsupported OpenGL attribute %d"),
                               wxattrs[arg - 1]);
                    continue;
            }

            // copy attribute value as is
            glattrs[p++] = wxattrs[arg++];
        }

        glattrs[p] = None;
    }

    return true;
}

/* static */
bool
wxGLCanvasX11::InitXVisualInfo(const int *attribList,
                               GLXFBConfig **pFBC,
                               XVisualInfo **pXVisual)
{
    int data[512];
    if ( !ConvertWXAttrsToGL(attribList, data, WXSIZEOF(data)) )
        return false;

    Display * const dpy = wxGetX11Display();

    if ( GetGLXVersion() >= 13 )
    {
        int returned;
        *pFBC = glXChooseFBConfig(dpy, DefaultScreen(dpy), data, &returned);

        if ( *pFBC )
        {
            *pXVisual = glXGetVisualFromFBConfig(wxGetX11Display(), **pFBC);
            if ( !*pXVisual )
            {
                XFree(*pFBC);
                *pFBC = NULL;
            }
        }
    }
    else // GLX <= 1.2
    {
        *pFBC = NULL;
        *pXVisual = glXChooseVisual(dpy, DefaultScreen(dpy), data);
    }

    return *pXVisual != NULL;
}

/* static */
bool
wxGLCanvasBase::IsDisplaySupported(const int *attribList)
{
    GLXFBConfig *fbc = NULL;
    XVisualInfo *vi = NULL;

    const bool
        isSupported = wxGLCanvasX11::InitXVisualInfo(attribList, &fbc, &vi);

    if ( fbc )
        XFree(fbc);
    if ( vi )
        XFree(vi);

    return isSupported;
}

// ----------------------------------------------------------------------------
// default visual management
// ----------------------------------------------------------------------------

XVisualInfo *wxGLCanvasX11::ms_glVisualInfo = NULL;
GLXFBConfig *wxGLCanvasX11::ms_glFBCInfo = NULL;

/* static */
bool wxGLCanvasX11::InitDefaultVisualInfo(const int *attribList)
{
    FreeDefaultVisualInfo();

    return InitXVisualInfo(attribList, &ms_glFBCInfo, &ms_glVisualInfo);
}

/* static */
void wxGLCanvasX11::FreeDefaultVisualInfo()
{
    if ( ms_glFBCInfo )
    {
        XFree(ms_glFBCInfo);
        ms_glFBCInfo = NULL;
    }

    if ( ms_glVisualInfo )
    {
        XFree(ms_glVisualInfo);
        ms_glVisualInfo = NULL;
    }
}

// ----------------------------------------------------------------------------
// other GL methods
// ----------------------------------------------------------------------------

/* static */
int wxGLCanvasX11::GetGLXVersion()
{
    static int s_glxVersion = 0;
    if ( s_glxVersion == 0 )
    {
        // check the GLX version
        int glxMajorVer, glxMinorVer;
        bool ok = glXQueryVersion(wxGetX11Display(), &glxMajorVer, &glxMinorVer);
        wxASSERT_MSG( ok, _T("GLX version not found") );
        if (!ok)
            s_glxVersion = 10; // 1.0 by default
        else
            s_glxVersion = glxMajorVer*10 + glxMinorVer;
    }

    return s_glxVersion;
}

bool wxGLCanvasX11::SwapBuffers()
{
    const Window xid = GetXWindow();
    wxCHECK2_MSG( xid, return false, _T("window must be shown") );

    glXSwapBuffers(wxGetX11Display(), xid);
    return true;
}

bool wxGLCanvasX11::IsShownOnScreen() const
{
    return GetXWindow() && wxGLCanvasBase::IsShownOnScreen();
}

#endif // wxUSE_GLCANVAS
Commit	Line	Data
	1	///////////////////////////////////////////////////////////////////////////////
	2	// Name: src/univ/glx11.cpp
	3	// Purpose: code common to all X11-based wxGLCanvas implementations
	4	// Author: Vadim Zeitlin
	5	// Created: 2007-04-15
	6	// RCS-ID: $Id$
	7	// Copyright: (c) 2007 Vadim Zeitlin <vadim@wxwindows.org>
	8	// Licence: wxWindows licence
	9	///////////////////////////////////////////////////////////////////////////////
	10
	11	// ============================================================================
	12	// declarations
	13	// ============================================================================
	14
	15	// ----------------------------------------------------------------------------
	16	// headers
	17	// ----------------------------------------------------------------------------
	18
	19	// for compilers that support precompilation, includes "wx.h".
	20	#include "wx/wxprec.h"
	21
	22	#if wxUSE_GLCANVAS
	23
	24	#ifndef WX_PRECOMP
	25	#include "wx/log.h"
	26	#endif //WX_PRECOMP
	27
	28	#include "wx/glcanvas.h"
	29
	30	// ============================================================================
	31	// wxGLContext implementation
	32	// ============================================================================
	33
	34	IMPLEMENT_CLASS(wxGLContext, wxObject)
	35
	36	wxGLContext::wxGLContext(wxGLCanvas gc, const wxGLContext other)
	37	{
	38	if ( wxGLCanvas::GetGLXVersion() >= 13 )
	39	{
	40	GLXFBConfig *fbc = gc->GetGLXFBConfig();
	41	wxCHECK_RET( fbc, _T("invalid GLXFBConfig for OpenGL") );
	42
	43	m_glContext = glXCreateNewContext( wxGetX11Display(), fbc[0], GLX_RGBA_TYPE,
	44	other ? other->m_glContext : None,
	45	GL_TRUE );
	46	}
	47	else // GLX <= 1.2
	48	{
	49	XVisualInfo *vi = gc->GetXVisualInfo();
	50	wxCHECK_RET( vi, _T("invalid visual for OpenGL") );
	51
	52	m_glContext = glXCreateContext( wxGetX11Display(), vi,
	53	other ? other->m_glContext : None,
	54	GL_TRUE );
	55	}
	56
	57	wxASSERT_MSG( m_glContext, _T("Couldn't create OpenGL context") );
	58	}
	59
	60	wxGLContext::~wxGLContext()
	61	{
	62	if ( !m_glContext )
	63	return;
	64
	65	if ( m_glContext == glXGetCurrentContext() )
	66	MakeCurrent(None, NULL);
	67
	68	glXDestroyContext( wxGetX11Display(), m_glContext );
	69	}
	70
	71	bool wxGLContext::SetCurrent(const wxGLCanvas& win) const
	72	{
	73	if ( !m_glContext )
	74	return false;
	75
	76	const Window xid = win.GetXWindow();
	77	wxCHECK2_MSG( xid, return false, _T("window must be shown") );
	78
	79	return MakeCurrent(xid, m_glContext);
	80	}
	81
	82	// wrapper around glXMakeContextCurrent/glXMakeCurrent depending on GLX
	83	// version
	84	/* static */
	85	bool wxGLContext::MakeCurrent(GLXDrawable drawable, GLXContext context)
	86	{
	87	if (wxGLCanvas::GetGLXVersion() >= 13)
	88	return glXMakeContextCurrent( wxGetX11Display(), drawable, drawable, context);
	89	else // GLX <= 1.2 doesn't have glXMakeContextCurrent()
	90	return glXMakeCurrent( wxGetX11Display(), drawable, context);
	91	}
	92
	93	// ============================================================================
	94	// wxGLCanvasX11 implementation
	95	// ============================================================================
	96
	97	// ----------------------------------------------------------------------------
	98	// initialization methods and dtor
	99	// ----------------------------------------------------------------------------
	100
	101	wxGLCanvasX11::wxGLCanvasX11()
	102	{
	103	m_fbc = NULL;
	104	m_vi = NULL;
	105	}
	106
	107	bool wxGLCanvasX11::InitVisual(const int *attribList)
	108	{
	109	return InitXVisualInfo(attribList, &m_fbc, &m_vi);
	110	}
	111
	112	wxGLCanvasX11::~wxGLCanvasX11()
	113	{
	114	if ( m_fbc && m_fbc != ms_glFBCInfo )
	115	XFree(m_fbc);
	116
	117	if ( m_vi && m_vi != ms_glVisualInfo )
	118	XFree(m_vi);
	119	}
	120
	121	// ----------------------------------------------------------------------------
	122	// working with GL attributes
	123	// ----------------------------------------------------------------------------
	124
	125	bool
	126	wxGLCanvasX11::ConvertWXAttrsToGL(const int wxattrs, int glattrs, size_t n)
	127	{
	128	wxCHECK_MSG( n >= 16, false, _T("GL attributes buffer too small") );
	129
	130	if ( !wxattrs )
	131	{
	132	if ( GetGLXVersion() >= 13 )
	133	{
	134	// leave GLX >= 1.3 choose the default attributes
	135	glattrs[0] = None;
	136	}
	137	else // GLX < 1.3
	138	{
	139	// default settings if attriblist = 0
	140	size_t i = 0;
	141	glattrs[i++] = GLX_RGBA;
	142	glattrs[i++] = GLX_DOUBLEBUFFER;
	143	glattrs[i++] = GLX_DEPTH_SIZE; glattrs[i++] = 1;
	144	glattrs[i++] = GLX_RED_SIZE; glattrs[i++] = 1;
	145	glattrs[i++] = GLX_GREEN_SIZE; glattrs[i++] = 1;
	146	glattrs[i++] = GLX_BLUE_SIZE; glattrs[i++] = 1;
	147	glattrs[i++] = GLX_ALPHA_SIZE; glattrs[i++] = 0;
	148	glattrs[i++] = None;
	149
	150	wxASSERT_MSG( i < n, _T("GL attributes buffer too small") );
	151	}
	152	}
	153	else // have non-default attributes
	154	{
	155	size_t p = 0;
	156	for ( int arg = 0; wxattrs[arg] != 0; )
	157	{
	158	// check if we have any space left, knowing that we may insert 2
	159	// more elements during this loop iteration and we always need to
	160	// terminate the list with None (hence -3)
	161	if ( p >= n - 2 )
	162	return false;
	163
	164	switch ( wxattrs[arg++] )
	165	{
	166	case WX_GL_RGBA:
	167	// for GLX >= 1.3, GLX_RGBA is useless and apparently
	168	// harmful for some implementations
	169	//
	170	// FIXME: is this true?
	171	if ( GetGLXVersion() <= 12 )
	172	{
	173	glattrs[p++] = GLX_RGBA;
	174	}
	175
	176	// use "continue" to skip the assignment of the attribute
	177	// value at the end of the loop
	178	continue;
	179
	180	case WX_GL_BUFFER_SIZE:
	181	glattrs[p++] = GLX_BUFFER_SIZE;
	182	break;
	183
	184	case WX_GL_LEVEL:
	185	glattrs[p++] = GLX_LEVEL;
	186	break;
	187
	188	// the following boolean attributes don't have values in wx
	189	// API (they're turned on if specified) but do have them in
	190	// OpenGL, so do put them into glattrs and also skip the
	191	// copy of wx value after switch by using "continue"
	192	// instead of "break"
	193	case WX_GL_DOUBLEBUFFER:
	194	glattrs[p++] = GLX_DOUBLEBUFFER;
	195	glattrs[p++] = True;
	196	continue;
	197
	198	case WX_GL_STEREO:
	199	glattrs[p++] = GLX_STEREO;
	200	glattrs[p++] = True;
	201	continue;
	202
	203
	204	case WX_GL_AUX_BUFFERS:
	205	glattrs[p++] = GLX_AUX_BUFFERS;
	206	break;
	207
	208	case WX_GL_MIN_RED:
	209	glattrs[p++] = GLX_RED_SIZE;
	210	break;
	211
	212	case WX_GL_MIN_GREEN:
	213	glattrs[p++] = GLX_GREEN_SIZE;
	214	break;
	215
	216	case WX_GL_MIN_BLUE:
	217	glattrs[p++] = GLX_BLUE_SIZE;
	218	break;
	219
	220	case WX_GL_MIN_ALPHA:
	221	glattrs[p++] = GLX_ALPHA_SIZE;
	222	break;
	223
	224	case WX_GL_DEPTH_SIZE:
	225	glattrs[p++] = GLX_DEPTH_SIZE;
	226	break;
	227
	228	case WX_GL_STENCIL_SIZE:
	229	glattrs[p++] = GLX_STENCIL_SIZE;
	230	break;
	231
	232	case WX_GL_MIN_ACCUM_RED:
	233	glattrs[p++] = GLX_ACCUM_RED_SIZE;
	234	break;
	235
	236	case WX_GL_MIN_ACCUM_GREEN:
	237	glattrs[p++] = GLX_ACCUM_GREEN_SIZE;
	238	break;
	239
	240	case WX_GL_MIN_ACCUM_BLUE:
	241	glattrs[p++] = GLX_ACCUM_BLUE_SIZE;
	242	break;
	243
	244	case WX_GL_MIN_ACCUM_ALPHA:
	245	glattrs[p++] = GLX_ACCUM_ALPHA_SIZE;
	246	break;
	247
	248	default:
	249	wxLogDebug(_T("Unsupported OpenGL attribute %d"),
	250	wxattrs[arg - 1]);
	251	continue;
	252	}
	253
	254	// copy attribute value as is
	255	glattrs[p++] = wxattrs[arg++];
	256	}
	257
	258	glattrs[p] = None;
	259	}
	260
	261	return true;
	262	}
	263
	264	/* static */
	265	bool
	266	wxGLCanvasX11::InitXVisualInfo(const int *attribList,
	267	GLXFBConfig **pFBC,
	268	XVisualInfo **pXVisual)
	269	{
	270	int data[512];
	271	if ( !ConvertWXAttrsToGL(attribList, data, WXSIZEOF(data)) )
	272	return false;
	273
	274	Display * const dpy = wxGetX11Display();
	275
	276	if ( GetGLXVersion() >= 13 )
	277	{
	278	int returned;
	279	*pFBC = glXChooseFBConfig(dpy, DefaultScreen(dpy), data, &returned);
	280
	281	if ( *pFBC )
	282	{
	283	pXVisual = glXGetVisualFromFBConfig(wxGetX11Display(), *pFBC);
	284	if ( !*pXVisual )
	285	{
	286	XFree(*pFBC);
	287	*pFBC = NULL;
	288	}
	289	}
	290	}
	291	else // GLX <= 1.2
	292	{
	293	*pFBC = NULL;
	294	*pXVisual = glXChooseVisual(dpy, DefaultScreen(dpy), data);
	295	}
	296
	297	return *pXVisual != NULL;
	298	}
	299
	300	/* static */
	301	bool
	302	wxGLCanvasBase::IsDisplaySupported(const int *attribList)
	303	{
	304	GLXFBConfig *fbc = NULL;
	305	XVisualInfo *vi = NULL;
	306
	307	const bool
	308	isSupported = wxGLCanvasX11::InitXVisualInfo(attribList, &fbc, &vi);
	309
	310	if ( fbc )
	311	XFree(fbc);
	312	if ( vi )
	313	XFree(vi);
	314
	315	return isSupported;
	316	}
	317
	318	// ----------------------------------------------------------------------------
	319	// default visual management
	320	// ----------------------------------------------------------------------------
	321
	322	XVisualInfo *wxGLCanvasX11::ms_glVisualInfo = NULL;
	323	GLXFBConfig *wxGLCanvasX11::ms_glFBCInfo = NULL;
	324
	325	/* static */
	326	bool wxGLCanvasX11::InitDefaultVisualInfo(const int *attribList)
	327	{
	328	FreeDefaultVisualInfo();
	329
	330	return InitXVisualInfo(attribList, &ms_glFBCInfo, &ms_glVisualInfo);
	331	}
	332
	333	/* static */
	334	void wxGLCanvasX11::FreeDefaultVisualInfo()
	335	{
	336	if ( ms_glFBCInfo )
	337	{
	338	XFree(ms_glFBCInfo);
	339	ms_glFBCInfo = NULL;
	340	}
	341
	342	if ( ms_glVisualInfo )
	343	{
	344	XFree(ms_glVisualInfo);
	345	ms_glVisualInfo = NULL;
	346	}
	347	}
	348
	349	// ----------------------------------------------------------------------------
	350	// other GL methods
	351	// ----------------------------------------------------------------------------
	352
	353	/* static */
	354	int wxGLCanvasX11::GetGLXVersion()
	355	{
	356	static int s_glxVersion = 0;
	357	if ( s_glxVersion == 0 )
	358	{
	359	// check the GLX version
	360	int glxMajorVer, glxMinorVer;
	361	bool ok = glXQueryVersion(wxGetX11Display(), &glxMajorVer, &glxMinorVer);
	362	wxASSERT_MSG( ok, _T("GLX version not found") );
	363	if (!ok)
	364	s_glxVersion = 10; // 1.0 by default
	365	else
	366	s_glxVersion = glxMajorVer*10 + glxMinorVer;
	367	}
	368
	369	return s_glxVersion;
	370	}
	371
	372	bool wxGLCanvasX11::SwapBuffers()
	373	{
	374	const Window xid = GetXWindow();
	375	wxCHECK2_MSG( xid, return false, _T("window must be shown") );
	376
	377	glXSwapBuffers(wxGetX11Display(), xid);
	378	return true;
	379	}
	380
	381	bool wxGLCanvasX11::IsShownOnScreen() const
	382	{
	383	return GetXWindow() && wxGLCanvasBase::IsShownOnScreen();
	384	}
	385
	386	#endif // wxUSE_GLCANVAS
	387