src/unix/glx11.cpp

///////////////////////////////////////////////////////////////////////////////
// Name:        src/unix/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"

// IRIX headers call this differently
#ifdef __SGI__
    #ifndef GLX_SAMPLE_BUFFERS_ARB
        #define GLX_SAMPLE_BUFFERS_ARB GLX_SAMPLE_BUFFERS_SGIS
    #endif
    #ifndef GLX_SAMPLES_ARB
        #define GLX_SAMPLES_ARB GLX_SAMPLES_SGIS
    #endif
#endif // __SGI__

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

IMPLEMENT_CLASS(wxGLContext, wxObject)

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

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

    wxASSERT_MSG( m_glContext, wxT("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, wxT("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, wxT("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, wxT("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:
#ifdef GLX_SAMPLE_BUFFERS_ARB
                    if ( IsGLXMultiSampleAvailable() )
                    {
                        glattrs[p++] = GLX_SAMPLE_BUFFERS_ARB;
                        break;
                    }
#endif // GLX_SAMPLE_BUFFERS_ARB
                    // if it was specified just to disable it, no problem
                    if ( !wxattrs[arg++] )
                        continue;

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

                case WX_GL_SAMPLES:
#ifdef GLX_SAMPLES_ARB
                    if ( IsGLXMultiSampleAvailable() )
                    {
                        glattrs[p++] = GLX_SAMPLES_ARB;
                        break;
                    }
#endif // GLX_SAMPLES_ARB

                    if ( !wxattrs[arg++] )
                        continue;

                    return false;

                default:
                    wxLogDebug(wxT("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, wxT("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, wxT("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/unix/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	// IRIX headers call this differently
	31	#ifdef __SGI__
	32	#ifndef GLX_SAMPLE_BUFFERS_ARB
	33	#define GLX_SAMPLE_BUFFERS_ARB GLX_SAMPLE_BUFFERS_SGIS
	34	#endif
	35	#ifndef GLX_SAMPLES_ARB
	36	#define GLX_SAMPLES_ARB GLX_SAMPLES_SGIS
	37	#endif
	38	#endif // __SGI__
	39
	40	// ============================================================================
	41	// wxGLContext implementation
	42	// ============================================================================
	43
	44	IMPLEMENT_CLASS(wxGLContext, wxObject)
	45
	46	wxGLContext::wxGLContext(wxGLCanvas gc, const wxGLContext other)
	47	{
	48	if ( wxGLCanvas::GetGLXVersion() >= 13 )
	49	{
	50	GLXFBConfig *fbc = gc->GetGLXFBConfig();
	51	wxCHECK_RET( fbc, wxT("invalid GLXFBConfig for OpenGL") );
	52
	53	m_glContext = glXCreateNewContext( wxGetX11Display(), fbc[0], GLX_RGBA_TYPE,
	54	other ? other->m_glContext : None,
	55	GL_TRUE );
	56	}
	57	else // GLX <= 1.2
	58	{
	59	XVisualInfo *vi = gc->GetXVisualInfo();
	60	wxCHECK_RET( vi, wxT("invalid visual for OpenGL") );
	61
	62	m_glContext = glXCreateContext( wxGetX11Display(), vi,
	63	other ? other->m_glContext : None,
	64	GL_TRUE );
	65	}
	66
	67	wxASSERT_MSG( m_glContext, wxT("Couldn't create OpenGL context") );
	68	}
	69
	70	wxGLContext::~wxGLContext()
	71	{
	72	if ( !m_glContext )
	73	return;
	74
	75	if ( m_glContext == glXGetCurrentContext() )
	76	MakeCurrent(None, NULL);
	77
	78	glXDestroyContext( wxGetX11Display(), m_glContext );
	79	}
	80
	81	bool wxGLContext::SetCurrent(const wxGLCanvas& win) const
	82	{
	83	if ( !m_glContext )
	84	return false;
	85
	86	const Window xid = win.GetXWindow();
	87	wxCHECK2_MSG( xid, return false, wxT("window must be shown") );
	88
	89	return MakeCurrent(xid, m_glContext);
	90	}
	91
	92	// wrapper around glXMakeContextCurrent/glXMakeCurrent depending on GLX
	93	// version
	94	/* static */
	95	bool wxGLContext::MakeCurrent(GLXDrawable drawable, GLXContext context)
	96	{
	97	if (wxGLCanvas::GetGLXVersion() >= 13)
	98	return glXMakeContextCurrent( wxGetX11Display(), drawable, drawable, context);
	99	else // GLX <= 1.2 doesn't have glXMakeContextCurrent()
	100	return glXMakeCurrent( wxGetX11Display(), drawable, context);
	101	}
	102
	103	// ============================================================================
	104	// wxGLCanvasX11 implementation
	105	// ============================================================================
	106
	107	// ----------------------------------------------------------------------------
	108	// initialization methods and dtor
	109	// ----------------------------------------------------------------------------
	110
	111	wxGLCanvasX11::wxGLCanvasX11()
	112	{
	113	m_fbc = NULL;
	114	m_vi = NULL;
	115	}
	116
	117	bool wxGLCanvasX11::InitVisual(const int *attribList)
	118	{
	119	return InitXVisualInfo(attribList, &m_fbc, &m_vi);
	120	}
	121
	122	wxGLCanvasX11::~wxGLCanvasX11()
	123	{
	124	if ( m_fbc && m_fbc != ms_glFBCInfo )
	125	XFree(m_fbc);
	126
	127	if ( m_vi && m_vi != ms_glVisualInfo )
	128	XFree(m_vi);
	129	}
	130
	131	// ----------------------------------------------------------------------------
	132	// working with GL attributes
	133	// ----------------------------------------------------------------------------
	134
	135	/* static */
	136	bool wxGLCanvasBase::IsExtensionSupported(const char *extension)
	137	{
	138	Display * const dpy = wxGetX11Display();
	139
	140	return IsExtensionInList(glXQueryExtensionsString(dpy, DefaultScreen(dpy)),
	141	extension);
	142	}
	143
	144
	145	/* static */
	146	bool wxGLCanvasX11::IsGLXMultiSampleAvailable()
	147	{
	148	static int s_isMultiSampleAvailable = -1;
	149	if ( s_isMultiSampleAvailable == -1 )
	150	s_isMultiSampleAvailable = IsExtensionSupported("GLX_ARB_multisample");
	151
	152	return s_isMultiSampleAvailable != 0;
	153	}
	154
	155	bool
	156	wxGLCanvasX11::ConvertWXAttrsToGL(const int wxattrs, int glattrs, size_t n)
	157	{
	158	wxCHECK_MSG( n >= 16, false, wxT("GL attributes buffer too small") );
	159
	160	/*
	161	Different versions of GLX API use rather different attributes lists, see
	162	the following URLs:
	163
	164	- <= 1.2: http://www.opengl.org/sdk/docs/man/xhtml/glXChooseVisual.xml
	165	- >= 1.3: http://www.opengl.org/sdk/docs/man/xhtml/glXChooseFBConfig.xml
	166
	167	Notice in particular that
	168	- GLX_RGBA is boolean attribute in the old version of the API but a
	169	value of GLX_RENDER_TYPE in the new one
	170	- Boolean attributes such as GLX_DOUBLEBUFFER don't take values in the
	171	old version but must be followed by True or False in the new one.
	172	*/
	173
	174	if ( !wxattrs )
	175	{
	176	size_t i = 0;
	177
	178	// use double-buffered true colour by default
	179	glattrs[i++] = GLX_DOUBLEBUFFER;
	180
	181	if ( GetGLXVersion() < 13 )
	182	{
	183	// default settings if attriblist = 0
	184	glattrs[i++] = GLX_RGBA;
	185	glattrs[i++] = GLX_DEPTH_SIZE; glattrs[i++] = 1;
	186	glattrs[i++] = GLX_RED_SIZE; glattrs[i++] = 1;
	187	glattrs[i++] = GLX_GREEN_SIZE; glattrs[i++] = 1;
	188	glattrs[i++] = GLX_BLUE_SIZE; glattrs[i++] = 1;
	189	glattrs[i++] = GLX_ALPHA_SIZE; glattrs[i++] = 0;
	190	}
	191	else // recent GLX can choose the defaults on its own just fine
	192	{
	193	// we just need to have a value after GLX_DOUBLEBUFFER
	194	glattrs[i++] = True;
	195	}
	196
	197	glattrs[i] = None;
	198
	199	wxASSERT_MSG( i < n, wxT("GL attributes buffer too small") );
	200	}
	201	else // have non-default attributes
	202	{
	203	size_t p = 0;
	204	for ( int arg = 0; wxattrs[arg] != 0; )
	205	{
	206	// check if we have any space left, knowing that we may insert 2
	207	// more elements during this loop iteration and we always need to
	208	// terminate the list with None (hence -3)
	209	if ( p > n - 3 )
	210	return false;
	211
	212	// indicates whether we have a boolean attribute
	213	bool isBoolAttr = false;
	214
	215	switch ( wxattrs[arg++] )
	216	{
	217	case WX_GL_BUFFER_SIZE:
	218	glattrs[p++] = GLX_BUFFER_SIZE;
	219	break;
	220
	221	case WX_GL_LEVEL:
	222	glattrs[p++] = GLX_LEVEL;
	223	break;
	224
	225	case WX_GL_RGBA:
	226	if ( GetGLXVersion() >= 13 )
	227	{
	228	// this is the default GLX_RENDER_TYPE anyhow
	229	continue;
	230	}
	231
	232	glattrs[p++] = GLX_RGBA;
	233	isBoolAttr = true;
	234	break;
	235
	236	case WX_GL_DOUBLEBUFFER:
	237	glattrs[p++] = GLX_DOUBLEBUFFER;
	238	isBoolAttr = true;
	239	break;
	240
	241	case WX_GL_STEREO:
	242	glattrs[p++] = GLX_STEREO;
	243	isBoolAttr = true;
	244	break;
	245
	246	case WX_GL_AUX_BUFFERS:
	247	glattrs[p++] = GLX_AUX_BUFFERS;
	248	break;
	249
	250	case WX_GL_MIN_RED:
	251	glattrs[p++] = GLX_RED_SIZE;
	252	break;
	253
	254	case WX_GL_MIN_GREEN:
	255	glattrs[p++] = GLX_GREEN_SIZE;
	256	break;
	257
	258	case WX_GL_MIN_BLUE:
	259	glattrs[p++] = GLX_BLUE_SIZE;
	260	break;
	261
	262	case WX_GL_MIN_ALPHA:
	263	glattrs[p++] = GLX_ALPHA_SIZE;
	264	break;
	265
	266	case WX_GL_DEPTH_SIZE:
	267	glattrs[p++] = GLX_DEPTH_SIZE;
	268	break;
	269
	270	case WX_GL_STENCIL_SIZE:
	271	glattrs[p++] = GLX_STENCIL_SIZE;
	272	break;
	273
	274	case WX_GL_MIN_ACCUM_RED:
	275	glattrs[p++] = GLX_ACCUM_RED_SIZE;
	276	break;
	277
	278	case WX_GL_MIN_ACCUM_GREEN:
	279	glattrs[p++] = GLX_ACCUM_GREEN_SIZE;
	280	break;
	281
	282	case WX_GL_MIN_ACCUM_BLUE:
	283	glattrs[p++] = GLX_ACCUM_BLUE_SIZE;
	284	break;
	285
	286	case WX_GL_MIN_ACCUM_ALPHA:
	287	glattrs[p++] = GLX_ACCUM_ALPHA_SIZE;
	288	break;
	289
	290	case WX_GL_SAMPLE_BUFFERS:
	291	#ifdef GLX_SAMPLE_BUFFERS_ARB
	292	if ( IsGLXMultiSampleAvailable() )
	293	{
	294	glattrs[p++] = GLX_SAMPLE_BUFFERS_ARB;
	295	break;
	296	}
	297	#endif // GLX_SAMPLE_BUFFERS_ARB
	298	// if it was specified just to disable it, no problem
	299	if ( !wxattrs[arg++] )
	300	continue;
	301
	302	// otherwise indicate that it's not supported
	303	return false;
	304
	305	case WX_GL_SAMPLES:
	306	#ifdef GLX_SAMPLES_ARB
	307	if ( IsGLXMultiSampleAvailable() )
	308	{
	309	glattrs[p++] = GLX_SAMPLES_ARB;
	310	break;
	311	}
	312	#endif // GLX_SAMPLES_ARB
	313
	314	if ( !wxattrs[arg++] )
	315	continue;
	316
	317	return false;
	318
	319	default:
	320	wxLogDebug(wxT("Unsupported OpenGL attribute %d"),
	321	wxattrs[arg - 1]);
	322	continue;
	323	}
	324
	325	if ( isBoolAttr )
	326	{
	327	// as explained above, for pre 1.3 API the attribute just needs
	328	// to be present so we only add its value when using the new API
	329	if ( GetGLXVersion() >= 13 )
	330	glattrs[p++] = True;
	331	}
	332	else // attribute with real (non-boolean) value
	333	{
	334	// copy attribute value as is
	335	glattrs[p++] = wxattrs[arg++];
	336	}
	337	}
	338
	339	glattrs[p] = None;
	340	}
	341
	342	return true;
	343	}
	344
	345	/* static */
	346	bool
	347	wxGLCanvasX11::InitXVisualInfo(const int *attribList,
	348	GLXFBConfig **pFBC,
	349	XVisualInfo **pXVisual)
	350	{
	351	int data[512];
	352	if ( !ConvertWXAttrsToGL(attribList, data, WXSIZEOF(data)) )
	353	return false;
	354
	355	Display * const dpy = wxGetX11Display();
	356
	357	if ( GetGLXVersion() >= 13 )
	358	{
	359	int returned;
	360	*pFBC = glXChooseFBConfig(dpy, DefaultScreen(dpy), data, &returned);
	361
	362	if ( *pFBC )
	363	{
	364	pXVisual = glXGetVisualFromFBConfig(wxGetX11Display(), *pFBC);
	365	if ( !*pXVisual )
	366	{
	367	XFree(*pFBC);
	368	*pFBC = NULL;
	369	}
	370	}
	371	}
	372	else // GLX <= 1.2
	373	{
	374	*pFBC = NULL;
	375	*pXVisual = glXChooseVisual(dpy, DefaultScreen(dpy), data);
	376	}
	377
	378	return *pXVisual != NULL;
	379	}
	380
	381	/* static */
	382	bool
	383	wxGLCanvasBase::IsDisplaySupported(const int *attribList)
	384	{
	385	GLXFBConfig *fbc = NULL;
	386	XVisualInfo *vi = NULL;
	387
	388	const bool
	389	isSupported = wxGLCanvasX11::InitXVisualInfo(attribList, &fbc, &vi);
	390
	391	if ( fbc )
	392	XFree(fbc);
	393	if ( vi )
	394	XFree(vi);
	395
	396	return isSupported;
	397	}
	398
	399	// ----------------------------------------------------------------------------
	400	// default visual management
	401	// ----------------------------------------------------------------------------
	402
	403	XVisualInfo *wxGLCanvasX11::ms_glVisualInfo = NULL;
	404	GLXFBConfig *wxGLCanvasX11::ms_glFBCInfo = NULL;
	405
	406	/* static */
	407	bool wxGLCanvasX11::InitDefaultVisualInfo(const int *attribList)
	408	{
	409	FreeDefaultVisualInfo();
	410
	411	return InitXVisualInfo(attribList, &ms_glFBCInfo, &ms_glVisualInfo);
	412	}
	413
	414	/* static */
	415	void wxGLCanvasX11::FreeDefaultVisualInfo()
	416	{
	417	if ( ms_glFBCInfo )
	418	{
	419	XFree(ms_glFBCInfo);
	420	ms_glFBCInfo = NULL;
	421	}
	422
	423	if ( ms_glVisualInfo )
	424	{
	425	XFree(ms_glVisualInfo);
	426	ms_glVisualInfo = NULL;
	427	}
	428	}
	429
	430	// ----------------------------------------------------------------------------
	431	// other GL methods
	432	// ----------------------------------------------------------------------------
	433
	434	/* static */
	435	int wxGLCanvasX11::GetGLXVersion()
	436	{
	437	static int s_glxVersion = 0;
	438	if ( s_glxVersion == 0 )
	439	{
	440	// check the GLX version
	441	int glxMajorVer, glxMinorVer;
	442	bool ok = glXQueryVersion(wxGetX11Display(), &glxMajorVer, &glxMinorVer);
	443	wxASSERT_MSG( ok, wxT("GLX version not found") );
	444	if (!ok)
	445	s_glxVersion = 10; // 1.0 by default
	446	else
	447	s_glxVersion = glxMajorVer*10 + glxMinorVer;
	448	}
	449
	450	return s_glxVersion;
	451	}
	452
	453	bool wxGLCanvasX11::SwapBuffers()
	454	{
	455	const Window xid = GetXWindow();
	456	wxCHECK2_MSG( xid, return false, wxT("window must be shown") );
	457
	458	glXSwapBuffers(wxGetX11Display(), xid);
	459	return true;
	460	}
	461
	462	bool wxGLCanvasX11::IsShownOnScreen() const
	463	{
	464	return GetXWindow() && wxGLCanvasBase::IsShownOnScreen();
	465	}
	466
	467	#endif // wxUSE_GLCANVAS
	468