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
// ----------------------------------------------------------------------------

/* static */
bool wxGLCanvasBase::IsExtensionSupported(const char *extension)
{
    Display * const dpy = wxGetX11Display();

    return IsExtensionInList(glXQueryExtensionsString(dpy, DefaultScreen(dpy)),
                             extension);
}


/* static */
bool wxGLCanvasX11::IsGLXMultiSampleAvailable()
{
    static int s_isMultiSampleAvailable = -1;
    if ( s_isMultiSampleAvailable == -1 )
        s_isMultiSampleAvailable = IsExtensionSupported("GLX_ARB_multisample");

    return s_isMultiSampleAvailable != 0;
}

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

    /*
       Different versions of GLX API use rather different attributes lists, see
       the following URLs:

        - <= 1.2: http://www.opengl.org/sdk/docs/man/xhtml/glXChooseVisual.xml
        - >= 1.3: http://www.opengl.org/sdk/docs/man/xhtml/glXChooseFBConfig.xml

       Notice in particular that
        - GLX_RGBA is boolean attribute in the old version of the API but a
          value of GLX_RENDER_TYPE in the new one
        - Boolean attributes such as GLX_DOUBLEBUFFER don't take values in the
          old version but must be followed by True or False in the new one.
     */

    if ( !wxattrs )
    {
        size_t i = 0;

        // use double-buffered true colour by default
        glattrs[i++] = GLX_DOUBLEBUFFER;

        if ( GetGLXVersion() < 13 )
        {
            // default settings if attriblist = 0
            glattrs[i++] = GLX_RGBA;
            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;
        }
        else // recent GLX can choose the defaults on its own just fine
        {
            // we just need to have a value after GLX_DOUBLEBUFFER
            glattrs[i++] = True;
        }

        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 - 3 )
                return false;

            // indicates whether we have a boolean attribute
            bool isBoolAttr = false;

            switch ( wxattrs[arg++] )
            {
                case WX_GL_BUFFER_SIZE:
                    glattrs[p++] = GLX_BUFFER_SIZE;
                    break;

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

                case WX_GL_RGBA:
                    if ( GetGLXVersion() >= 13 )
                    {
                        // this is the default GLX_RENDER_TYPE anyhow
                        continue;
                    }

                    glattrs[p++] = GLX_RGBA;
                    isBoolAttr = true;
                    break;

                case WX_GL_DOUBLEBUFFER:
                    glattrs[p++] = GLX_DOUBLEBUFFER;
                    isBoolAttr = true;
                    break;

                case WX_GL_STEREO:
                    glattrs[p++] = GLX_STEREO;
                    isBoolAttr = true;
                    break;

                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;

                case WX_GL_SAMPLE_BUFFERS:
                    if ( !IsGLXMultiSampleAvailable() )
                    {
                        // if it was specified just to disable it, no problem
                        if ( !wxattrs[arg++] )
                            continue;

                        // otherwise indicate that it's not supported
                        return false;
                    }

                    glattrs[p++] = GLX_SAMPLE_BUFFERS_ARB;
                    break;

                case WX_GL_SAMPLES:
                    if ( !IsGLXMultiSampleAvailable() )
                    {
                        if ( !wxattrs[arg++] )
                            continue;

                        return false;
                    }

                    glattrs[p++] = GLX_SAMPLES_ARB;
                    break;

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

            if ( isBoolAttr )
            {
                // as explained above, for pre 1.3 API the attribute just needs
                // to be present so we only add its value when using the new API
                if ( GetGLXVersion() >= 13 )
                    glattrs[p++] = True;
            }
            else // attribute with real (non-boolean) value
            {
                // 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	/* static */
	126	bool wxGLCanvasBase::IsExtensionSupported(const char *extension)
	127	{
	128	Display * const dpy = wxGetX11Display();
	129
	130	return IsExtensionInList(glXQueryExtensionsString(dpy, DefaultScreen(dpy)),
	131	extension);
	132	}
	133
	134
	135	/* static */
	136	bool wxGLCanvasX11::IsGLXMultiSampleAvailable()
	137	{
	138	static int s_isMultiSampleAvailable = -1;
	139	if ( s_isMultiSampleAvailable == -1 )
	140	s_isMultiSampleAvailable = IsExtensionSupported("GLX_ARB_multisample");
	141
	142	return s_isMultiSampleAvailable != 0;
	143	}
	144
	145	bool
	146	wxGLCanvasX11::ConvertWXAttrsToGL(const int wxattrs, int glattrs, size_t n)
	147	{
	148	wxCHECK_MSG( n >= 16, false, _T("GL attributes buffer too small") );
	149
	150	/*
	151	Different versions of GLX API use rather different attributes lists, see
	152	the following URLs:
	153
	154	- <= 1.2: http://www.opengl.org/sdk/docs/man/xhtml/glXChooseVisual.xml
	155	- >= 1.3: http://www.opengl.org/sdk/docs/man/xhtml/glXChooseFBConfig.xml
	156
	157	Notice in particular that
	158	- GLX_RGBA is boolean attribute in the old version of the API but a
	159	value of GLX_RENDER_TYPE in the new one
	160	- Boolean attributes such as GLX_DOUBLEBUFFER don't take values in the
	161	old version but must be followed by True or False in the new one.
	162	*/
	163
	164	if ( !wxattrs )
	165	{
	166	size_t i = 0;
	167
	168	// use double-buffered true colour by default
	169	glattrs[i++] = GLX_DOUBLEBUFFER;
	170
	171	if ( GetGLXVersion() < 13 )
	172	{
	173	// default settings if attriblist = 0
	174	glattrs[i++] = GLX_RGBA;
	175	glattrs[i++] = GLX_DEPTH_SIZE; glattrs[i++] = 1;
	176	glattrs[i++] = GLX_RED_SIZE; glattrs[i++] = 1;
	177	glattrs[i++] = GLX_GREEN_SIZE; glattrs[i++] = 1;
	178	glattrs[i++] = GLX_BLUE_SIZE; glattrs[i++] = 1;
	179	glattrs[i++] = GLX_ALPHA_SIZE; glattrs[i++] = 0;
	180	}
	181	else // recent GLX can choose the defaults on its own just fine
	182	{
	183	// we just need to have a value after GLX_DOUBLEBUFFER
	184	glattrs[i++] = True;
	185	}
	186
	187	glattrs[i] = None;
	188
	189	wxASSERT_MSG( i < n, _T("GL attributes buffer too small") );
	190	}
	191	else // have non-default attributes
	192	{
	193	size_t p = 0;
	194	for ( int arg = 0; wxattrs[arg] != 0; )
	195	{
	196	// check if we have any space left, knowing that we may insert 2
	197	// more elements during this loop iteration and we always need to
	198	// terminate the list with None (hence -3)
	199	if ( p > n - 3 )
	200	return false;
	201
	202	// indicates whether we have a boolean attribute
	203	bool isBoolAttr = false;
	204
	205	switch ( wxattrs[arg++] )
	206	{
	207	case WX_GL_BUFFER_SIZE:
	208	glattrs[p++] = GLX_BUFFER_SIZE;
	209	break;
	210
	211	case WX_GL_LEVEL:
	212	glattrs[p++] = GLX_LEVEL;
	213	break;
	214
	215	case WX_GL_RGBA:
	216	if ( GetGLXVersion() >= 13 )
	217	{
	218	// this is the default GLX_RENDER_TYPE anyhow
	219	continue;
	220	}
	221
	222	glattrs[p++] = GLX_RGBA;
	223	isBoolAttr = true;
	224	break;
	225
	226	case WX_GL_DOUBLEBUFFER:
	227	glattrs[p++] = GLX_DOUBLEBUFFER;
	228	isBoolAttr = true;
	229	break;
	230
	231	case WX_GL_STEREO:
	232	glattrs[p++] = GLX_STEREO;
	233	isBoolAttr = true;
	234	break;
	235
	236	case WX_GL_AUX_BUFFERS:
	237	glattrs[p++] = GLX_AUX_BUFFERS;
	238	break;
	239
	240	case WX_GL_MIN_RED:
	241	glattrs[p++] = GLX_RED_SIZE;
	242	break;
	243
	244	case WX_GL_MIN_GREEN:
	245	glattrs[p++] = GLX_GREEN_SIZE;
	246	break;
	247
	248	case WX_GL_MIN_BLUE:
	249	glattrs[p++] = GLX_BLUE_SIZE;
	250	break;
	251
	252	case WX_GL_MIN_ALPHA:
	253	glattrs[p++] = GLX_ALPHA_SIZE;
	254	break;
	255
	256	case WX_GL_DEPTH_SIZE:
	257	glattrs[p++] = GLX_DEPTH_SIZE;
	258	break;
	259
	260	case WX_GL_STENCIL_SIZE:
	261	glattrs[p++] = GLX_STENCIL_SIZE;
	262	break;
	263
	264	case WX_GL_MIN_ACCUM_RED:
	265	glattrs[p++] = GLX_ACCUM_RED_SIZE;
	266	break;
	267
	268	case WX_GL_MIN_ACCUM_GREEN:
	269	glattrs[p++] = GLX_ACCUM_GREEN_SIZE;
	270	break;
	271
	272	case WX_GL_MIN_ACCUM_BLUE:
	273	glattrs[p++] = GLX_ACCUM_BLUE_SIZE;
	274	break;
	275
	276	case WX_GL_MIN_ACCUM_ALPHA:
	277	glattrs[p++] = GLX_ACCUM_ALPHA_SIZE;
	278	break;
	279
	280	case WX_GL_SAMPLE_BUFFERS:
	281	if ( !IsGLXMultiSampleAvailable() )
	282	{
	283	// if it was specified just to disable it, no problem
	284	if ( !wxattrs[arg++] )
	285	continue;
	286
	287	// otherwise indicate that it's not supported
	288	return false;
	289	}
	290
	291	glattrs[p++] = GLX_SAMPLE_BUFFERS_ARB;
	292	break;
	293
	294	case WX_GL_SAMPLES:
	295	if ( !IsGLXMultiSampleAvailable() )
	296	{
	297	if ( !wxattrs[arg++] )
	298	continue;
	299
	300	return false;
	301	}
	302
	303	glattrs[p++] = GLX_SAMPLES_ARB;
	304	break;
	305
	306	default:
	307	wxLogDebug(_T("Unsupported OpenGL attribute %d"),
	308	wxattrs[arg - 1]);
	309	continue;
	310	}
	311
	312	if ( isBoolAttr )
	313	{
	314	// as explained above, for pre 1.3 API the attribute just needs
	315	// to be present so we only add its value when using the new API
	316	if ( GetGLXVersion() >= 13 )
	317	glattrs[p++] = True;
	318	}
	319	else // attribute with real (non-boolean) value
	320	{
	321	// copy attribute value as is
	322	glattrs[p++] = wxattrs[arg++];
	323	}
	324	}
	325
	326	glattrs[p] = None;
	327	}
	328
	329	return true;
	330	}
	331
	332	/* static */
	333	bool
	334	wxGLCanvasX11::InitXVisualInfo(const int *attribList,
	335	GLXFBConfig **pFBC,
	336	XVisualInfo **pXVisual)
	337	{
	338	int data[512];
	339	if ( !ConvertWXAttrsToGL(attribList, data, WXSIZEOF(data)) )
	340	return false;
	341
	342	Display * const dpy = wxGetX11Display();
	343
	344	if ( GetGLXVersion() >= 13 )
	345	{
	346	int returned;
	347	*pFBC = glXChooseFBConfig(dpy, DefaultScreen(dpy), data, &returned);
	348
	349	if ( *pFBC )
	350	{
	351	pXVisual = glXGetVisualFromFBConfig(wxGetX11Display(), *pFBC);
	352	if ( !*pXVisual )
	353	{
	354	XFree(*pFBC);
	355	*pFBC = NULL;
	356	}
	357	}
	358	}
	359	else // GLX <= 1.2
	360	{
	361	*pFBC = NULL;
	362	*pXVisual = glXChooseVisual(dpy, DefaultScreen(dpy), data);
	363	}
	364
	365	return *pXVisual != NULL;
	366	}
	367
	368	/* static */
	369	bool
	370	wxGLCanvasBase::IsDisplaySupported(const int *attribList)
	371	{
	372	GLXFBConfig *fbc = NULL;
	373	XVisualInfo *vi = NULL;
	374
	375	const bool
	376	isSupported = wxGLCanvasX11::InitXVisualInfo(attribList, &fbc, &vi);
	377
	378	if ( fbc )
	379	XFree(fbc);
	380	if ( vi )
	381	XFree(vi);
	382
	383	return isSupported;
	384	}
	385
	386	// ----------------------------------------------------------------------------
	387	// default visual management
	388	// ----------------------------------------------------------------------------
	389
	390	XVisualInfo *wxGLCanvasX11::ms_glVisualInfo = NULL;
	391	GLXFBConfig *wxGLCanvasX11::ms_glFBCInfo = NULL;
	392
	393	/* static */
	394	bool wxGLCanvasX11::InitDefaultVisualInfo(const int *attribList)
	395	{
	396	FreeDefaultVisualInfo();
	397
	398	return InitXVisualInfo(attribList, &ms_glFBCInfo, &ms_glVisualInfo);
	399	}
	400
	401	/* static */
	402	void wxGLCanvasX11::FreeDefaultVisualInfo()
	403	{
	404	if ( ms_glFBCInfo )
	405	{
	406	XFree(ms_glFBCInfo);
	407	ms_glFBCInfo = NULL;
	408	}
	409
	410	if ( ms_glVisualInfo )
	411	{
	412	XFree(ms_glVisualInfo);
	413	ms_glVisualInfo = NULL;
	414	}
	415	}
	416
	417	// ----------------------------------------------------------------------------
	418	// other GL methods
	419	// ----------------------------------------------------------------------------
	420
	421	/* static */
	422	int wxGLCanvasX11::GetGLXVersion()
	423	{
	424	static int s_glxVersion = 0;
	425	if ( s_glxVersion == 0 )
	426	{
	427	// check the GLX version
	428	int glxMajorVer, glxMinorVer;
	429	bool ok = glXQueryVersion(wxGetX11Display(), &glxMajorVer, &glxMinorVer);
	430	wxASSERT_MSG( ok, _T("GLX version not found") );
	431	if (!ok)
	432	s_glxVersion = 10; // 1.0 by default
	433	else
	434	s_glxVersion = glxMajorVer*10 + glxMinorVer;
	435	}
	436
	437	return s_glxVersion;
	438	}
	439
	440	bool wxGLCanvasX11::SwapBuffers()
	441	{
	442	const Window xid = GetXWindow();
	443	wxCHECK2_MSG( xid, return false, _T("window must be shown") );
	444
	445	glXSwapBuffers(wxGetX11Display(), xid);
	446	return true;
	447	}
	448
	449	bool wxGLCanvasX11::IsShownOnScreen() const
	450	{
	451	return GetXWindow() && wxGLCanvasBase::IsShownOnScreen();
	452	}
	453
	454	#endif // wxUSE_GLCANVAS
	455