src/gtk1/glcanvas.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        src/gtk1/glcanvas.cpp
// Purpose:     wxGLCanvas, for using OpenGL/Mesa with wxWidgets and GTK
// Author:      Robert Roebling
// Modified by:
// Created:     17/08/98
// RCS-ID:      $Id$
// Copyright:   (c) Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

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

#if wxUSE_GLCANVAS

#include "wx/glcanvas.h"

#ifndef WX_PRECOMP
    #include "wx/app.h"
    #include "wx/frame.h"
    #include "wx/colour.h"
    #include "wx/module.h"
#endif // WX_PRECOMP

extern "C"
{
#include "gtk/gtk.h"
#include "gdk/gdk.h"
#include "gdk/gdkx.h"
}

#include "wx/gtk1/win_gtk.h"

// DLL options compatibility check:
#include "wx/build.h"
WX_CHECK_BUILD_OPTIONS("wxGL")


//---------------------------------------------------------------------------
// static variables
//---------------------------------------------------------------------------
int wxGLCanvas::m_glxVersion = 0;

//---------------------------------------------------------------------------
// global data
//---------------------------------------------------------------------------

XVisualInfo *g_vi = (XVisualInfo*) NULL;
//-----------------------------------------------------------------------------
// idle system
//-----------------------------------------------------------------------------

extern void wxapp_install_idle_handler();
extern bool g_isIdle;

//---------------------------------------------------------------------------
// wxGLContext
//---------------------------------------------------------------------------

IMPLEMENT_CLASS(wxGLContext,wxObject)

wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
{
    m_window = win;
    m_widget = win->m_wxwindow;

    wxGLCanvas *gc = (wxGLCanvas*) win;

    if (wxGLCanvas::GetGLXVersion() >= 13)
    {
        // GLX >= 1.3
        GLXFBConfig *fbc = gc->m_fbc;
        wxCHECK_RET( fbc, _T("invalid GLXFBConfig for OpenGl") );
        m_glContext = glXCreateNewContext( GDK_DISPLAY(), fbc[0], GLX_RGBA_TYPE, None, GL_TRUE );
    }
    else
    {
        // GLX <= 1.2
        XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
        wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
        m_glContext = glXCreateContext( GDK_DISPLAY(), vi, None, GL_TRUE );
    }

    wxCHECK_RET( m_glContext, _T("Couldn't create OpenGl context") );
}

wxGLContext::wxGLContext(
               bool WXUNUSED(isRGB), wxWindow *win,
               const wxPalette& WXUNUSED(palette),
               const wxGLContext *other        /* for sharing display lists */
)
{
    m_window = win;
    m_widget = win->m_wxwindow;

    wxGLCanvas *gc = (wxGLCanvas*) win;

    if (wxGLCanvas::GetGLXVersion() >= 13)
    {
        // GLX >= 1.3
        GLXFBConfig *fbc = gc->m_fbc;
        wxCHECK_RET( fbc, _T("invalid GLXFBConfig for OpenGl") );
        m_glContext = glXCreateNewContext( GDK_DISPLAY(), fbc[0], GLX_RGBA_TYPE,
                                           other ? other->m_glContext : None,
                                           GL_TRUE );
    }
    else
    {
        // GLX <= 1.2
        XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
        wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
        m_glContext = glXCreateContext( GDK_DISPLAY(), vi,
                                        other ? other->m_glContext : None,
                                        GL_TRUE );
    }

    if ( !m_glContext )
    {
        wxFAIL_MSG( _T("Couldn't create OpenGl context") );
    }
}

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

    if (m_glContext == glXGetCurrentContext())
    {
        if (wxGLCanvas::GetGLXVersion() >= 13)
            // GLX >= 1.3
            glXMakeContextCurrent( GDK_DISPLAY(), None, None, NULL);
        else
            // GLX <= 1.2
            glXMakeCurrent( GDK_DISPLAY(), None, NULL);
    }

    glXDestroyContext( GDK_DISPLAY(), m_glContext );
}

void wxGLContext::SwapBuffers()
{
    if (m_glContext)
    {
        GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
        glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
    }
}

void wxGLContext::SetCurrent()
{
    if (m_glContext)
    {
        GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;

        if (wxGLCanvas::GetGLXVersion() >= 13)
            // GLX >= 1.3
            glXMakeContextCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window),
                                   GDK_WINDOW_XWINDOW(window), m_glContext );
        else
            // GLX <= 1.2
            glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
    }
}

void wxGLContext::SetColour(const wxChar *colour)
{
    wxColour col = wxTheColourDatabase->Find(colour);
    if (col.Ok())
    {
        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);
    }
}

void wxGLContext::SetupPixelFormat()
{
}

void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
{
}

wxPalette wxGLContext::CreateDefaultPalette()
{
    return wxNullPalette;
}

//-----------------------------------------------------------------------------
// "realize" from m_wxwindow
//-----------------------------------------------------------------------------

extern "C" {
static gint
gtk_glwindow_realized_callback( GtkWidget *WXUNUSED(widget), wxGLCanvas *win )
{
    if ( !win->m_glContext )
    {
        wxGLContext *share = win->m_sharedContext;
        if ( !share && win->m_sharedContextOf )
            share = win->m_sharedContextOf->GetContext();

        win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, share );
    }

    return FALSE;
}
}

//-----------------------------------------------------------------------------
// "map" from m_wxwindow
//-----------------------------------------------------------------------------

extern "C" {
static gint
gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
{
    if (win->m_glContext/* && win->m_exposed*/)
    {
        wxPaintEvent event( win->GetId() );
        event.SetEventObject( win );
        win->GetEventHandler()->ProcessEvent( event );

        win->m_exposed = false;
        win->GetUpdateRegion().Clear();
    }

    return FALSE;
}
}

//-----------------------------------------------------------------------------
// "expose_event" of m_wxwindow
//-----------------------------------------------------------------------------

extern "C" {
static void
gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
{
    if (g_isIdle)
        wxapp_install_idle_handler();

    win->m_exposed = true;

    win->GetUpdateRegion().Union( gdk_event->area.x,
                                  gdk_event->area.y,
                                  gdk_event->area.width,
                                  gdk_event->area.height );
}
}

//-----------------------------------------------------------------------------
// "draw" of m_wxwindow
//-----------------------------------------------------------------------------

extern "C" {
static void
gtk_glwindow_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxGLCanvas *win )
{
    if (g_isIdle)
        wxapp_install_idle_handler();

    win->m_exposed = true;

    win->GetUpdateRegion().Union( rect->x, rect->y,
                                  rect->width, rect->height );
}
}

//-----------------------------------------------------------------------------
// "size_allocate" of m_wxwindow
//-----------------------------------------------------------------------------

extern "C" {
static void
gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxGLCanvas *win )
{
    if (g_isIdle)
        wxapp_install_idle_handler();

    if (!win->m_hasVMT)
        return;

    wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
    event.SetEventObject( win );
    win->GetEventHandler()->ProcessEvent( event );
}
}

//---------------------------------------------------------------------------
// wxGlCanvas
//---------------------------------------------------------------------------

IMPLEMENT_CLASS(wxGLCanvas, wxWindow)

BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
    EVT_SIZE(wxGLCanvas::OnSize)
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 )
{
    Create( parent, NULL, NULL, id, pos, size, style, name, attribList, 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 )
{
    Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
}

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 )
{
    Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
}

bool wxGLCanvas::Create( wxWindow *parent,
                         const wxGLContext *shared,
                         const wxGLCanvas *shared_context_of,
                         wxWindowID id,
                         const wxPoint& pos, const wxSize& size,
                         long style, const wxString& name,
                         int *attribList,
                         const wxPalette& palette)
{
    m_sharedContext = (wxGLContext*)shared;  // const_cast
    m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
    m_glContext = (wxGLContext*) NULL;

    m_exposed = false;
    m_noExpose = true;
    m_nativeSizeEvent = true;
    m_fbc = NULL;
    m_vi = NULL;

    // to be sure the glx version is known
    wxGLCanvas::QueryGLXVersion();

    if (wxGLCanvas::GetGLXVersion() >= 13)
    {
        // GLX >= 1.3 uses a GLXFBConfig
        GLXFBConfig * fbc = NULL;
        if (wxTheApp->m_glFBCInfo != NULL)
        {
            fbc = (GLXFBConfig *) wxTheApp->m_glFBCInfo;
            m_canFreeFBC = false; // owned by wxTheApp - don't free upon destruction
        }
        else
        {
            fbc = (GLXFBConfig *) wxGLCanvas::ChooseGLFBC(attribList);
            m_canFreeFBC = true;
        }
        m_fbc = fbc;  // save for later use
        wxCHECK_MSG( m_fbc, false, _T("required FBConfig couldn't be found") );
    }

    XVisualInfo *vi = NULL;
    if (wxTheApp->m_glVisualInfo != NULL)
    {
        vi = (XVisualInfo *)wxTheApp->m_glVisualInfo;
        m_canFreeVi = false; // owned by wxTheApp - don't free upon destruction
    }
    else
    {
        if (wxGLCanvas::GetGLXVersion() >= 13)
        // GLX >= 1.3
            vi = glXGetVisualFromFBConfig(GDK_DISPLAY(), m_fbc[0]);
        else
            // GLX <= 1.2
            vi = (XVisualInfo *) ChooseGLVisual(attribList);

        m_canFreeVi = true;
    }

    m_vi = vi;  // save for later use

    wxCHECK_MSG( m_vi, false, _T("required visual couldn't be found") );
    GdkVisual *visual;
    GdkColormap *colormap;

    // MR: This needs a fix for lower gtk+ versions too. Might need to rethink logic (FIXME)
#if 0
    if (!gtk_check_version(2,2,0))
    {
        wxWindow::Create( parent, id, pos, size, style, name );

        m_glWidget = m_wxwindow;

        GdkScreen *screen = gtk_widget_get_screen( m_glWidget );
        colormap = gdk_screen_get_default_colormap(screen);
        visual = gdk_colormap_get_visual(colormap);

        if (GDK_VISUAL_XVISUAL(visual)->visualid != vi->visualid)
        {
            visual = gdk_x11_screen_lookup_visual( screen, vi->visualid );
            colormap = gdk_colormap_new(visual, FALSE);
        }

        gtk_widget_set_colormap( m_glWidget, colormap );
    }
    else
#endif
    {
        visual = gdkx_visual_get( vi->visualid );
        colormap = gdk_colormap_new( visual, TRUE );

        gtk_widget_push_colormap( colormap );
        gtk_widget_push_visual( visual );

        wxWindow::Create( parent, id, pos, size, style, name );
        m_glWidget = m_wxwindow;
    }

    gtk_pizza_set_clear( GTK_PIZZA(m_wxwindow), FALSE );

    gtk_signal_connect( GTK_OBJECT(m_wxwindow), "realize",
                            GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );

    gtk_signal_connect( GTK_OBJECT(m_wxwindow), "map",
                            GTK_SIGNAL_FUNC(gtk_glwindow_map_callback), (gpointer) this );

    gtk_signal_connect( GTK_OBJECT(m_wxwindow), "expose_event",
        GTK_SIGNAL_FUNC(gtk_glwindow_expose_callback), (gpointer)this );

    gtk_signal_connect( GTK_OBJECT(m_wxwindow), "draw",
        GTK_SIGNAL_FUNC(gtk_glwindow_draw_callback), (gpointer)this );

    gtk_signal_connect( GTK_OBJECT(m_widget), "size_allocate",
        GTK_SIGNAL_FUNC(gtk_glcanvas_size_callback), (gpointer)this );

    gtk_widget_pop_visual();
    gtk_widget_pop_colormap();

    // if our parent window is already visible, we had been realized before we
    // connected to the "realize" signal and hence our m_glContext hasn't been
    // initialized yet and we have to do it now
    if (GTK_WIDGET_REALIZED(m_wxwindow))
        gtk_glwindow_realized_callback( m_wxwindow, this );

    if (GTK_WIDGET_MAPPED(m_wxwindow))
        gtk_glwindow_map_callback( m_wxwindow, this );

    return true;
}

wxGLCanvas::~wxGLCanvas()
{
    GLXFBConfig * fbc = (GLXFBConfig *) m_fbc;
    if (fbc && m_canFreeFBC)
        XFree( fbc );

    XVisualInfo *vi = (XVisualInfo *) m_vi;
    if (vi && m_canFreeVi)
        XFree( vi );

    delete m_glContext;
}

void* wxGLCanvas::ChooseGLVisual(int *attribList)
{
    int data[512];
    GetGLAttribListFromWX( attribList, data );
    attribList = (int*) data;

    Display *dpy = GDK_DISPLAY();

    return glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
}

void* wxGLCanvas::ChooseGLFBC(int *attribList)
{
    int data[512];
    GetGLAttribListFromWX( attribList, data );
    attribList = (int*) data;

    int returned;
    return glXChooseFBConfig( GDK_DISPLAY(), DefaultScreen(GDK_DISPLAY()),
                              attribList, &returned );
}


void wxGLCanvas::GetGLAttribListFromWX(int *wx_attribList, int *gl_attribList )
{
    if (!wx_attribList)
    {
        if (wxGLCanvas::GetGLXVersion() >= 13)
        // leave GLX >= 1.3 choose the default attributes
            gl_attribList[0] = 0;
        else
        {
            int i = 0;
            // default settings if attriblist = 0
            gl_attribList[i++] = GLX_RGBA;
            gl_attribList[i++] = GLX_DOUBLEBUFFER;
            gl_attribList[i++] = GLX_DEPTH_SIZE;   gl_attribList[i++] = 1;
            gl_attribList[i++] = GLX_RED_SIZE;     gl_attribList[i++] = 1;
            gl_attribList[i++] = GLX_GREEN_SIZE;   gl_attribList[i++] = 1;
            gl_attribList[i++] = GLX_BLUE_SIZE;    gl_attribList[i++] = 1;
            gl_attribList[i++] = GLX_ALPHA_SIZE;   gl_attribList[i++] = 0;
            gl_attribList[i++] = None;
        }
    }
    else
    {
        int arg=0, p=0;
        while( (wx_attribList[arg]!=0) && (p<510) )
        {
            switch( wx_attribList[arg++] )
            {
                case WX_GL_RGBA:
                    if (wxGLCanvas::GetGLXVersion() <= 12)
                        // for GLX >= 1.3, GLX_RGBA is useless (setting this flags will crash on most opengl implm)
                        gl_attribList[p++] = GLX_RGBA;
                    break;
                case WX_GL_BUFFER_SIZE:
                    gl_attribList[p++] = GLX_BUFFER_SIZE;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                case WX_GL_LEVEL:
                    gl_attribList[p++] = GLX_LEVEL;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                case WX_GL_DOUBLEBUFFER:
                    if (wxGLCanvas::GetGLXVersion() <= 12)
                        gl_attribList[p++] = GLX_DOUBLEBUFFER;
                    else
                        // for GLX >= 1.3, GLX_DOUBLEBUFFER format is different (1 <=> True)
                        // it seems this flag is useless for some hardware opengl implementation.
                        // but for Mesa 6.2.1, this flag is used so don't ignore it.
                        gl_attribList[p++] = GLX_DOUBLEBUFFER;
                    gl_attribList[p++] = 1;
                    break;
                case WX_GL_STEREO:
                    gl_attribList[p++] = GLX_STEREO;
                    break;
                case WX_GL_AUX_BUFFERS:
                    gl_attribList[p++] = GLX_AUX_BUFFERS;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                case WX_GL_MIN_RED:
                    gl_attribList[p++] = GLX_RED_SIZE;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                case WX_GL_MIN_GREEN:
                    gl_attribList[p++] = GLX_GREEN_SIZE;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                case WX_GL_MIN_BLUE:
                    gl_attribList[p++] = GLX_BLUE_SIZE;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                case WX_GL_MIN_ALPHA:
                    gl_attribList[p++] = GLX_ALPHA_SIZE;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                case WX_GL_DEPTH_SIZE:
                    gl_attribList[p++] = GLX_DEPTH_SIZE;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                case WX_GL_STENCIL_SIZE:
                    gl_attribList[p++] = GLX_STENCIL_SIZE;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                case WX_GL_MIN_ACCUM_RED:
                    gl_attribList[p++] = GLX_ACCUM_RED_SIZE;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                case WX_GL_MIN_ACCUM_GREEN:
                    gl_attribList[p++] = GLX_ACCUM_GREEN_SIZE;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                case WX_GL_MIN_ACCUM_BLUE:
                    gl_attribList[p++] = GLX_ACCUM_BLUE_SIZE;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                case WX_GL_MIN_ACCUM_ALPHA:
                    gl_attribList[p++] = GLX_ACCUM_ALPHA_SIZE;
                    gl_attribList[p++] = wx_attribList[arg++];
                    break;
                default:
                    break;
            }
        }

        gl_attribList[p] = 0;
    }
}

void wxGLCanvas::QueryGLXVersion()
{
    if (m_glxVersion == 0)
    {
        // check the GLX version
        int glxMajorVer, glxMinorVer;
        bool ok = glXQueryVersion(GDK_DISPLAY(), &glxMajorVer, &glxMinorVer);
        wxASSERT_MSG( ok, _T("GLX version not found") );
        if (!ok)
            m_glxVersion = 10; // 1.0 by default
        else
            m_glxVersion = glxMajorVer*10 + glxMinorVer;
    }
}

int wxGLCanvas::GetGLXVersion()
{
    wxASSERT_MSG( m_glxVersion>0, _T("GLX version has not been initialized with wxGLCanvas::QueryGLXVersion()") );
    return m_glxVersion;
}


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 );
}

void wxGLCanvas::OnInternalIdle()
{
    if (m_glContext && m_exposed)
    {
        wxPaintEvent event( GetId() );
        event.SetEventObject( this );
        GetEventHandler()->ProcessEvent( event );

        m_exposed = false;
        GetUpdateRegion().Clear();
    }

    wxWindow::OnInternalIdle();
}


//---------------------------------------------------------------------------
// wxGLApp
//---------------------------------------------------------------------------

IMPLEMENT_CLASS(wxGLApp, wxApp)

wxGLApp::~wxGLApp()
{
    if (m_glFBCInfo)
        XFree(m_glFBCInfo);
    if (m_glVisualInfo)
        XFree(m_glVisualInfo);
}

bool wxGLApp::InitGLVisual(int *attribList)
{
    wxGLCanvas::QueryGLXVersion();

    if (wxGLCanvas::GetGLXVersion() >= 13)
    {
        // GLX >= 1.3
        if (m_glFBCInfo)
            XFree(m_glFBCInfo);
        m_glFBCInfo = wxGLCanvas::ChooseGLFBC(attribList);

        if (m_glFBCInfo)
        {
            if (m_glVisualInfo)
                XFree(m_glVisualInfo);
            m_glVisualInfo = glXGetVisualFromFBConfig(GDK_DISPLAY(), ((GLXFBConfig *)m_glFBCInfo)[0]);
        }
        return (m_glFBCInfo != NULL) && (m_glVisualInfo != NULL);
    }
    else
    {
        // GLX <= 1.2
        if (m_glVisualInfo)
            XFree(m_glVisualInfo);
        m_glVisualInfo = wxGLCanvas::ChooseGLVisual(attribList);
        return m_glVisualInfo != NULL;
    }
}

#endif
    // wxUSE_GLCANVAS
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: src/gtk1/glcanvas.cpp
	3	// Purpose: wxGLCanvas, for using OpenGL/Mesa with wxWidgets and GTK
	4	// Author: Robert Roebling
	5	// Modified by:
	6	// Created: 17/08/98
	7	// RCS-ID: $Id$
	8	// Copyright: (c) Robert Roebling
	9	// Licence: wxWindows licence
	10	/////////////////////////////////////////////////////////////////////////////
	11
	12	// For compilers that support precompilation, includes "wx.h".
	13	#include "wx/wxprec.h"
	14
	15	#if wxUSE_GLCANVAS
	16
	17	#include "wx/glcanvas.h"
	18
	19	#ifndef WX_PRECOMP
	20	#include "wx/app.h"
	21	#include "wx/frame.h"
	22	#include "wx/colour.h"
	23	#include "wx/module.h"
	24	#endif // WX_PRECOMP
	25
	26	extern "C"
	27	{
	28	#include "gtk/gtk.h"
	29	#include "gdk/gdk.h"
	30	#include "gdk/gdkx.h"
	31	}
	32
	33	#include "wx/gtk1/win_gtk.h"
	34
	35	// DLL options compatibility check:
	36	#include "wx/build.h"
	37	WX_CHECK_BUILD_OPTIONS("wxGL")
	38
	39
	40	//---------------------------------------------------------------------------
	41	// static variables
	42	//---------------------------------------------------------------------------
	43	int wxGLCanvas::m_glxVersion = 0;
	44
	45	//---------------------------------------------------------------------------
	46	// global data
	47	//---------------------------------------------------------------------------
	48
	49	XVisualInfo g_vi = (XVisualInfo) NULL;
	50	//-----------------------------------------------------------------------------
	51	// idle system
	52	//-----------------------------------------------------------------------------
	53
	54	extern void wxapp_install_idle_handler();
	55	extern bool g_isIdle;
	56
	57	//---------------------------------------------------------------------------
	58	// wxGLContext
	59	//---------------------------------------------------------------------------
	60
	61	IMPLEMENT_CLASS(wxGLContext,wxObject)
	62
	63	wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
	64	{
	65	m_window = win;
	66	m_widget = win->m_wxwindow;
	67
	68	wxGLCanvas gc = (wxGLCanvas) win;
	69
	70	if (wxGLCanvas::GetGLXVersion() >= 13)
	71	{
	72	// GLX >= 1.3
	73	GLXFBConfig *fbc = gc->m_fbc;
	74	wxCHECK_RET( fbc, _T("invalid GLXFBConfig for OpenGl") );
	75	m_glContext = glXCreateNewContext( GDK_DISPLAY(), fbc[0], GLX_RGBA_TYPE, None, GL_TRUE );
	76	}
	77	else
	78	{
	79	// GLX <= 1.2
	80	XVisualInfo vi = (XVisualInfo ) gc->m_vi;
	81	wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
	82	m_glContext = glXCreateContext( GDK_DISPLAY(), vi, None, GL_TRUE );
	83	}
	84
	85	wxCHECK_RET( m_glContext, _T("Couldn't create OpenGl context") );
	86	}
	87
	88	wxGLContext::wxGLContext(
	89	bool WXUNUSED(isRGB), wxWindow *win,
	90	const wxPalette& WXUNUSED(palette),
	91	const wxGLContext other / for sharing display lists */
	92	)
	93	{
	94	m_window = win;
	95	m_widget = win->m_wxwindow;
	96
	97	wxGLCanvas gc = (wxGLCanvas) win;
	98
	99	if (wxGLCanvas::GetGLXVersion() >= 13)
	100	{
	101	// GLX >= 1.3
	102	GLXFBConfig *fbc = gc->m_fbc;
	103	wxCHECK_RET( fbc, _T("invalid GLXFBConfig for OpenGl") );
	104	m_glContext = glXCreateNewContext( GDK_DISPLAY(), fbc[0], GLX_RGBA_TYPE,
	105	other ? other->m_glContext : None,
	106	GL_TRUE );
	107	}
	108	else
	109	{
	110	// GLX <= 1.2
	111	XVisualInfo vi = (XVisualInfo ) gc->m_vi;
	112	wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
	113	m_glContext = glXCreateContext( GDK_DISPLAY(), vi,
	114	other ? other->m_glContext : None,
	115	GL_TRUE );
	116	}
	117
	118	if ( !m_glContext )
	119	{
	120	wxFAIL_MSG( _T("Couldn't create OpenGl context") );
	121	}
	122	}
	123
	124	wxGLContext::~wxGLContext()
	125	{
	126	if (!m_glContext) return;
	127
	128	if (m_glContext == glXGetCurrentContext())
	129	{
	130	if (wxGLCanvas::GetGLXVersion() >= 13)
	131	// GLX >= 1.3
	132	glXMakeContextCurrent( GDK_DISPLAY(), None, None, NULL);
	133	else
	134	// GLX <= 1.2
	135	glXMakeCurrent( GDK_DISPLAY(), None, NULL);
	136	}
	137
	138	glXDestroyContext( GDK_DISPLAY(), m_glContext );
	139	}
	140
	141	void wxGLContext::SwapBuffers()
	142	{
	143	if (m_glContext)
	144	{
	145	GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
	146	glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
	147	}
	148	}
	149
	150	void wxGLContext::SetCurrent()
	151	{
	152	if (m_glContext)
	153	{
	154	GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
	155
	156	if (wxGLCanvas::GetGLXVersion() >= 13)
	157	// GLX >= 1.3
	158	glXMakeContextCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window),
	159	GDK_WINDOW_XWINDOW(window), m_glContext );
	160	else
	161	// GLX <= 1.2
	162	glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
	163	}
	164	}
	165
	166	void wxGLContext::SetColour(const wxChar *colour)
	167	{
	168	wxColour col = wxTheColourDatabase->Find(colour);
	169	if (col.Ok())
	170	{
	171	float r = (float)(col.Red()/256.0);
	172	float g = (float)(col.Green()/256.0);
	173	float b = (float)(col.Blue()/256.0);
	174	glColor3f( r, g, b);
	175	}
	176	}
	177
	178	void wxGLContext::SetupPixelFormat()
	179	{
	180	}
	181
	182	void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
	183	{
	184	}
	185
	186	wxPalette wxGLContext::CreateDefaultPalette()
	187	{
	188	return wxNullPalette;
	189	}
	190
	191	//-----------------------------------------------------------------------------
	192	// "realize" from m_wxwindow
	193	//-----------------------------------------------------------------------------
	194
	195	extern "C" {
	196	static gint
	197	gtk_glwindow_realized_callback( GtkWidget WXUNUSED(widget), wxGLCanvas win )
	198	{
	199	if ( !win->m_glContext )
	200	{
	201	wxGLContext *share = win->m_sharedContext;
	202	if ( !share && win->m_sharedContextOf )
	203	share = win->m_sharedContextOf->GetContext();
	204
	205	win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, share );
	206	}
	207
	208	return FALSE;
	209	}
	210	}
	211
	212	//-----------------------------------------------------------------------------
	213	// "map" from m_wxwindow
	214	//-----------------------------------------------------------------------------
	215
	216	extern "C" {
	217	static gint
	218	gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
	219	{
	220	if (win->m_glContext/* && win->m_exposed*/)
	221	{
	222	wxPaintEvent event( win->GetId() );
	223	event.SetEventObject( win );
	224	win->GetEventHandler()->ProcessEvent( event );
	225
	226	win->m_exposed = false;
	227	win->GetUpdateRegion().Clear();
	228	}
	229
	230	return FALSE;
	231	}
	232	}
	233
	234	//-----------------------------------------------------------------------------
	235	// "expose_event" of m_wxwindow
	236	//-----------------------------------------------------------------------------
	237
	238	extern "C" {
	239	static void
	240	gtk_glwindow_expose_callback( GtkWidget WXUNUSED(widget), GdkEventExpose gdk_event, wxGLCanvas *win )
	241	{
	242	if (g_isIdle)
	243	wxapp_install_idle_handler();
	244
	245	win->m_exposed = true;
	246
	247	win->GetUpdateRegion().Union( gdk_event->area.x,
	248	gdk_event->area.y,
	249	gdk_event->area.width,
	250	gdk_event->area.height );
	251	}
	252	}
	253
	254	//-----------------------------------------------------------------------------
	255	// "draw" of m_wxwindow
	256	//-----------------------------------------------------------------------------
	257
	258	extern "C" {
	259	static void
	260	gtk_glwindow_draw_callback( GtkWidget WXUNUSED(widget), GdkRectangle rect, wxGLCanvas *win )
	261	{
	262	if (g_isIdle)
	263	wxapp_install_idle_handler();
	264
	265	win->m_exposed = true;
	266
	267	win->GetUpdateRegion().Union( rect->x, rect->y,
	268	rect->width, rect->height );
	269	}
	270	}
	271
	272	//-----------------------------------------------------------------------------
	273	// "size_allocate" of m_wxwindow
	274	//-----------------------------------------------------------------------------
	275
	276	extern "C" {
	277	static void
	278	gtk_glcanvas_size_callback( GtkWidget WXUNUSED(widget), GtkAllocation alloc, wxGLCanvas *win )
	279	{
	280	if (g_isIdle)
	281	wxapp_install_idle_handler();
	282
	283	if (!win->m_hasVMT)
	284	return;
	285
	286	wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
	287	event.SetEventObject( win );
	288	win->GetEventHandler()->ProcessEvent( event );
	289	}
	290	}
	291
	292	//---------------------------------------------------------------------------
	293	// wxGlCanvas
	294	//---------------------------------------------------------------------------
	295
	296	IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
	297
	298	BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
	299	EVT_SIZE(wxGLCanvas::OnSize)
	300	END_EVENT_TABLE()
	301
	302	wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
	303	const wxPoint& pos, const wxSize& size,
	304	long style, const wxString& name,
	305	int *attribList,
	306	const wxPalette& palette )
	307	{
	308	Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
	309	}
	310
	311	wxGLCanvas::wxGLCanvas( wxWindow *parent,
	312	const wxGLContext *shared,
	313	wxWindowID id,
	314	const wxPoint& pos, const wxSize& size,
	315	long style, const wxString& name,
	316	int *attribList,
	317	const wxPalette& palette )
	318	{
	319	Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
	320	}
	321
	322	wxGLCanvas::wxGLCanvas( wxWindow *parent,
	323	const wxGLCanvas *shared,
	324	wxWindowID id,
	325	const wxPoint& pos, const wxSize& size,
	326	long style, const wxString& name,
	327	int *attribList,
	328	const wxPalette& palette )
	329	{
	330	Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
	331	}
	332
	333	bool wxGLCanvas::Create( wxWindow *parent,
	334	const wxGLContext *shared,
	335	const wxGLCanvas *shared_context_of,
	336	wxWindowID id,
	337	const wxPoint& pos, const wxSize& size,
	338	long style, const wxString& name,
	339	int *attribList,
	340	const wxPalette& palette)
	341	{
	342	m_sharedContext = (wxGLContext*)shared; // const_cast
	343	m_sharedContextOf = (wxGLCanvas*)shared_context_of; // const_cast
	344	m_glContext = (wxGLContext*) NULL;
	345
	346	m_exposed = false;
	347	m_noExpose = true;
	348	m_nativeSizeEvent = true;
	349	m_fbc = NULL;
	350	m_vi = NULL;
	351
	352	// to be sure the glx version is known
	353	wxGLCanvas::QueryGLXVersion();
	354
	355	if (wxGLCanvas::GetGLXVersion() >= 13)
	356	{
	357	// GLX >= 1.3 uses a GLXFBConfig
	358	GLXFBConfig * fbc = NULL;
	359	if (wxTheApp->m_glFBCInfo != NULL)
	360	{
	361	fbc = (GLXFBConfig *) wxTheApp->m_glFBCInfo;
	362	m_canFreeFBC = false; // owned by wxTheApp - don't free upon destruction
	363	}
	364	else
	365	{
	366	fbc = (GLXFBConfig *) wxGLCanvas::ChooseGLFBC(attribList);
	367	m_canFreeFBC = true;
	368	}
	369	m_fbc = fbc; // save for later use
	370	wxCHECK_MSG( m_fbc, false, _T("required FBConfig couldn't be found") );
	371	}
	372
	373	XVisualInfo *vi = NULL;
	374	if (wxTheApp->m_glVisualInfo != NULL)
	375	{
	376	vi = (XVisualInfo *)wxTheApp->m_glVisualInfo;
	377	m_canFreeVi = false; // owned by wxTheApp - don't free upon destruction
	378	}
	379	else
	380	{
	381	if (wxGLCanvas::GetGLXVersion() >= 13)
	382	// GLX >= 1.3
	383	vi = glXGetVisualFromFBConfig(GDK_DISPLAY(), m_fbc[0]);
	384	else
	385	// GLX <= 1.2
	386	vi = (XVisualInfo *) ChooseGLVisual(attribList);
	387
	388	m_canFreeVi = true;
	389	}
	390
	391	m_vi = vi; // save for later use
	392
	393	wxCHECK_MSG( m_vi, false, _T("required visual couldn't be found") );
	394	GdkVisual *visual;
	395	GdkColormap *colormap;
	396
	397	// MR: This needs a fix for lower gtk+ versions too. Might need to rethink logic (FIXME)
	398	#if 0
	399	if (!gtk_check_version(2,2,0))
	400	{
	401	wxWindow::Create( parent, id, pos, size, style, name );
	402
	403	m_glWidget = m_wxwindow;
	404
	405	GdkScreen *screen = gtk_widget_get_screen( m_glWidget );
	406	colormap = gdk_screen_get_default_colormap(screen);
	407	visual = gdk_colormap_get_visual(colormap);
	408
	409	if (GDK_VISUAL_XVISUAL(visual)->visualid != vi->visualid)
	410	{
	411	visual = gdk_x11_screen_lookup_visual( screen, vi->visualid );
	412	colormap = gdk_colormap_new(visual, FALSE);
	413	}
	414
	415	gtk_widget_set_colormap( m_glWidget, colormap );
	416	}
	417	else
	418	#endif
	419	{
	420	visual = gdkx_visual_get( vi->visualid );
	421	colormap = gdk_colormap_new( visual, TRUE );
	422
	423	gtk_widget_push_colormap( colormap );
	424	gtk_widget_push_visual( visual );
	425
	426	wxWindow::Create( parent, id, pos, size, style, name );
	427	m_glWidget = m_wxwindow;
	428	}
	429
	430	gtk_pizza_set_clear( GTK_PIZZA(m_wxwindow), FALSE );
	431
	432	gtk_signal_connect( GTK_OBJECT(m_wxwindow), "realize",
	433	GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
	434
	435	gtk_signal_connect( GTK_OBJECT(m_wxwindow), "map",
	436	GTK_SIGNAL_FUNC(gtk_glwindow_map_callback), (gpointer) this );
	437
	438	gtk_signal_connect( GTK_OBJECT(m_wxwindow), "expose_event",
	439	GTK_SIGNAL_FUNC(gtk_glwindow_expose_callback), (gpointer)this );
	440
	441	gtk_signal_connect( GTK_OBJECT(m_wxwindow), "draw",
	442	GTK_SIGNAL_FUNC(gtk_glwindow_draw_callback), (gpointer)this );
	443
	444	gtk_signal_connect( GTK_OBJECT(m_widget), "size_allocate",
	445	GTK_SIGNAL_FUNC(gtk_glcanvas_size_callback), (gpointer)this );
	446
	447	gtk_widget_pop_visual();
	448	gtk_widget_pop_colormap();
	449
	450	// if our parent window is already visible, we had been realized before we
	451	// connected to the "realize" signal and hence our m_glContext hasn't been
	452	// initialized yet and we have to do it now
	453	if (GTK_WIDGET_REALIZED(m_wxwindow))
	454	gtk_glwindow_realized_callback( m_wxwindow, this );
	455
	456	if (GTK_WIDGET_MAPPED(m_wxwindow))
	457	gtk_glwindow_map_callback( m_wxwindow, this );
	458
	459	return true;
	460	}
	461
	462	wxGLCanvas::~wxGLCanvas()
	463	{
	464	GLXFBConfig * fbc = (GLXFBConfig *) m_fbc;
	465	if (fbc && m_canFreeFBC)
	466	XFree( fbc );
	467
	468	XVisualInfo vi = (XVisualInfo ) m_vi;
	469	if (vi && m_canFreeVi)
	470	XFree( vi );
	471
	472	delete m_glContext;
	473	}
	474
	475	void* wxGLCanvas::ChooseGLVisual(int *attribList)
	476	{
	477	int data[512];
	478	GetGLAttribListFromWX( attribList, data );
	479	attribList = (int*) data;
	480
	481	Display *dpy = GDK_DISPLAY();
	482
	483	return glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
	484	}
	485
	486	void* wxGLCanvas::ChooseGLFBC(int *attribList)
	487	{
	488	int data[512];
	489	GetGLAttribListFromWX( attribList, data );
	490	attribList = (int*) data;
	491
	492	int returned;
	493	return glXChooseFBConfig( GDK_DISPLAY(), DefaultScreen(GDK_DISPLAY()),
	494	attribList, &returned );
	495	}
	496
	497
	498	void wxGLCanvas::GetGLAttribListFromWX(int wx_attribList, int gl_attribList )
	499	{
	500	if (!wx_attribList)
	501	{
	502	if (wxGLCanvas::GetGLXVersion() >= 13)
	503	// leave GLX >= 1.3 choose the default attributes
	504	gl_attribList[0] = 0;
	505	else
	506	{
	507	int i = 0;
	508	// default settings if attriblist = 0
	509	gl_attribList[i++] = GLX_RGBA;
	510	gl_attribList[i++] = GLX_DOUBLEBUFFER;
	511	gl_attribList[i++] = GLX_DEPTH_SIZE; gl_attribList[i++] = 1;
	512	gl_attribList[i++] = GLX_RED_SIZE; gl_attribList[i++] = 1;
	513	gl_attribList[i++] = GLX_GREEN_SIZE; gl_attribList[i++] = 1;
	514	gl_attribList[i++] = GLX_BLUE_SIZE; gl_attribList[i++] = 1;
	515	gl_attribList[i++] = GLX_ALPHA_SIZE; gl_attribList[i++] = 0;
	516	gl_attribList[i++] = None;
	517	}
	518	}
	519	else
	520	{
	521	int arg=0, p=0;
	522	while( (wx_attribList[arg]!=0) && (p<510) )
	523	{
	524	switch( wx_attribList[arg++] )
	525	{
	526	case WX_GL_RGBA:
	527	if (wxGLCanvas::GetGLXVersion() <= 12)
	528	// for GLX >= 1.3, GLX_RGBA is useless (setting this flags will crash on most opengl implm)
	529	gl_attribList[p++] = GLX_RGBA;
	530	break;
	531	case WX_GL_BUFFER_SIZE:
	532	gl_attribList[p++] = GLX_BUFFER_SIZE;
	533	gl_attribList[p++] = wx_attribList[arg++];
	534	break;
	535	case WX_GL_LEVEL:
	536	gl_attribList[p++] = GLX_LEVEL;
	537	gl_attribList[p++] = wx_attribList[arg++];
	538	break;
	539	case WX_GL_DOUBLEBUFFER:
	540	if (wxGLCanvas::GetGLXVersion() <= 12)
	541	gl_attribList[p++] = GLX_DOUBLEBUFFER;
	542	else
	543	// for GLX >= 1.3, GLX_DOUBLEBUFFER format is different (1 <=> True)
	544	// it seems this flag is useless for some hardware opengl implementation.
	545	// but for Mesa 6.2.1, this flag is used so don't ignore it.
	546	gl_attribList[p++] = GLX_DOUBLEBUFFER;
	547	gl_attribList[p++] = 1;
	548	break;
	549	case WX_GL_STEREO:
	550	gl_attribList[p++] = GLX_STEREO;
	551	break;
	552	case WX_GL_AUX_BUFFERS:
	553	gl_attribList[p++] = GLX_AUX_BUFFERS;
	554	gl_attribList[p++] = wx_attribList[arg++];
	555	break;
	556	case WX_GL_MIN_RED:
	557	gl_attribList[p++] = GLX_RED_SIZE;
	558	gl_attribList[p++] = wx_attribList[arg++];
	559	break;
	560	case WX_GL_MIN_GREEN:
	561	gl_attribList[p++] = GLX_GREEN_SIZE;
	562	gl_attribList[p++] = wx_attribList[arg++];
	563	break;
	564	case WX_GL_MIN_BLUE:
	565	gl_attribList[p++] = GLX_BLUE_SIZE;
	566	gl_attribList[p++] = wx_attribList[arg++];
	567	break;
	568	case WX_GL_MIN_ALPHA:
	569	gl_attribList[p++] = GLX_ALPHA_SIZE;
	570	gl_attribList[p++] = wx_attribList[arg++];
	571	break;
	572	case WX_GL_DEPTH_SIZE:
	573	gl_attribList[p++] = GLX_DEPTH_SIZE;
	574	gl_attribList[p++] = wx_attribList[arg++];
	575	break;
	576	case WX_GL_STENCIL_SIZE:
	577	gl_attribList[p++] = GLX_STENCIL_SIZE;
	578	gl_attribList[p++] = wx_attribList[arg++];
	579	break;
	580	case WX_GL_MIN_ACCUM_RED:
	581	gl_attribList[p++] = GLX_ACCUM_RED_SIZE;
	582	gl_attribList[p++] = wx_attribList[arg++];
	583	break;
	584	case WX_GL_MIN_ACCUM_GREEN:
	585	gl_attribList[p++] = GLX_ACCUM_GREEN_SIZE;
	586	gl_attribList[p++] = wx_attribList[arg++];
	587	break;
	588	case WX_GL_MIN_ACCUM_BLUE:
	589	gl_attribList[p++] = GLX_ACCUM_BLUE_SIZE;
	590	gl_attribList[p++] = wx_attribList[arg++];
	591	break;
	592	case WX_GL_MIN_ACCUM_ALPHA:
	593	gl_attribList[p++] = GLX_ACCUM_ALPHA_SIZE;
	594	gl_attribList[p++] = wx_attribList[arg++];
	595	break;
	596	default:
	597	break;
	598	}
	599	}
	600
	601	gl_attribList[p] = 0;
	602	}
	603	}
	604
	605	void wxGLCanvas::QueryGLXVersion()
	606	{
	607	if (m_glxVersion == 0)
	608	{
	609	// check the GLX version
	610	int glxMajorVer, glxMinorVer;
	611	bool ok = glXQueryVersion(GDK_DISPLAY(), &glxMajorVer, &glxMinorVer);
	612	wxASSERT_MSG( ok, _T("GLX version not found") );
	613	if (!ok)
	614	m_glxVersion = 10; // 1.0 by default
	615	else
	616	m_glxVersion = glxMajorVer*10 + glxMinorVer;
	617	}
	618	}
	619
	620	int wxGLCanvas::GetGLXVersion()
	621	{
	622	wxASSERT_MSG( m_glxVersion>0, _T("GLX version has not been initialized with wxGLCanvas::QueryGLXVersion()") );
	623	return m_glxVersion;
	624	}
	625
	626
	627	void wxGLCanvas::SwapBuffers()
	628	{
	629	if (m_glContext)
	630	m_glContext->SwapBuffers();
	631	}
	632
	633	void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
	634	{
	635	}
	636
	637	void wxGLCanvas::SetCurrent()
	638	{
	639	if (m_glContext)
	640	m_glContext->SetCurrent();
	641	}
	642
	643	void wxGLCanvas::SetColour( const wxChar *colour )
	644	{
	645	if (m_glContext)
	646	m_glContext->SetColour( colour );
	647	}
	648
	649	void wxGLCanvas::OnInternalIdle()
	650	{
	651	if (m_glContext && m_exposed)
	652	{
	653	wxPaintEvent event( GetId() );
	654	event.SetEventObject( this );
	655	GetEventHandler()->ProcessEvent( event );
	656
	657	m_exposed = false;
	658	GetUpdateRegion().Clear();
	659	}
	660
	661	wxWindow::OnInternalIdle();
	662	}
	663
	664
	665
	666	//---------------------------------------------------------------------------
	667	// wxGLApp
	668	//---------------------------------------------------------------------------
	669
	670	IMPLEMENT_CLASS(wxGLApp, wxApp)
	671
	672	wxGLApp::~wxGLApp()
	673	{
	674	if (m_glFBCInfo)
	675	XFree(m_glFBCInfo);
	676	if (m_glVisualInfo)
	677	XFree(m_glVisualInfo);
	678	}
	679
	680	bool wxGLApp::InitGLVisual(int *attribList)
	681	{
	682	wxGLCanvas::QueryGLXVersion();
	683
	684	if (wxGLCanvas::GetGLXVersion() >= 13)
	685	{
	686	// GLX >= 1.3
	687	if (m_glFBCInfo)
	688	XFree(m_glFBCInfo);
	689	m_glFBCInfo = wxGLCanvas::ChooseGLFBC(attribList);
	690
	691	if (m_glFBCInfo)
	692	{
	693	if (m_glVisualInfo)
	694	XFree(m_glVisualInfo);
	695	m_glVisualInfo = glXGetVisualFromFBConfig(GDK_DISPLAY(), ((GLXFBConfig *)m_glFBCInfo)[0]);
	696	}
	697	return (m_glFBCInfo != NULL) && (m_glVisualInfo != NULL);
	698	}
	699	else
	700	{
	701	// GLX <= 1.2
	702	if (m_glVisualInfo)
	703	XFree(m_glVisualInfo);
	704	m_glVisualInfo = wxGLCanvas::ChooseGLVisual(attribList);
	705	return m_glVisualInfo != NULL;
	706	}
	707	}
	708
	709	#endif
	710	// wxUSE_GLCANVAS