[wxWidgets.git] / src / motif / glcanvas.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        glcanvas.cpp
// Purpose:     wxGLCanvas, for using OpenGL with wxWindows 2.0 for Motif.
//              Uses the GLX extension.
// Author:      Julian Smart and Wolfram Gloger
// Modified by:
// Created:     1995, 1999
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart, Wolfram Gloger
// Licence:   	wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "glcanvas.h"
#endif

#include "wx/setup.h"

#if wxUSE_GLCANVAS

#include "wx/glcanvas.h"
#include "wx/utils.h"
#include "wx/app.h"
#include "wx/log.h"

#ifdef __VMS
# pragma message disable nosimpint
#endif
#include <Xm/Xm.h>
#ifdef __VMS
# pragma message enable nosimpint
#endif
#include "wx/motif/private.h"

#ifdef OLD_MESA
// workaround for bug in Mesa's glx.c
static int bitcount( unsigned long n )
{
    int bits;
    for (bits=0; n>0;) {
	if(n & 1) bits++;
	n = n >> 1;
    }
    return bits;
}
#endif

/*
 * GLContext implementation
 */

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;
    XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
    
    wxCHECK_RET( vi, "invalid visual for OpenGl" );
    
    m_glContext = glXCreateContext( (Display *)m_window->GetXDisplay(), vi,
                                    None, GL_TRUE);
  
    wxCHECK_RET( m_glContext, "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;
    XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
    
    wxCHECK_RET( vi, "invalid visual for OpenGl" );
    
    if( other != 0 )
        m_glContext = glXCreateContext( (Display *)m_window->GetXDisplay(), vi, 
                                        other->m_glContext, GL_TRUE );
    else
        m_glContext = glXCreateContext( (Display *)m_window->GetXDisplay(), vi,
                                        None, GL_TRUE );
    
    wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
}

wxGLContext::~wxGLContext()
{
    if (!m_glContext) return;
    
    if (m_glContext == glXGetCurrentContext())
    {
        glXMakeCurrent( (Display*) m_window->GetXDisplay(), None, NULL);
    }
	
    glXDestroyContext( (Display*) m_window->GetXDisplay(), m_glContext );
}

void wxGLContext::SwapBuffers()
{
    if (m_glContext)
    {
        Display* display = (Display*) m_window->GetXDisplay();
        glXSwapBuffers(display, (Window) m_window->GetXWindow());
    }
}

void wxGLContext::SetCurrent()
{
    if (m_glContext) 
    { 
        Display* display = (Display*) m_window->GetXDisplay();
        glXMakeCurrent(display, (Window) m_window->GetXWindow(), 
                       m_glContext );;
    }
}

void wxGLContext::SetColour(const char *colour)
{
    wxColour *the_colour = wxTheColourDatabase->FindColour(colour);
    if(the_colour) {
	GLboolean b;
	glGetBooleanv(GL_RGBA_MODE, &b);
	if(b) {
	    glColor3ub(the_colour->Red(),
		       the_colour->Green(),
		       the_colour->Blue());
	} else {
	    GLint pix = (GLint)the_colour->m_pixel;
	    if(pix == -1) {
		XColor exact_def;
		exact_def.red = (unsigned short)the_colour->Red() << 8;
		exact_def.green = (unsigned short)the_colour->Green() << 8;
		exact_def.blue = (unsigned short)the_colour->Blue() << 8;
		exact_def.flags = DoRed | DoGreen | DoBlue;
		if(!XAllocColor((Display*) m_window->GetXDisplay(),
                  (Colormap) wxTheApp->GetMainColormap(m_window->GetXDisplay()),
                  &exact_def)) {
		    wxLogError("wxGLCanvas: cannot allocate color\n");
		    return;
		}
		pix = the_colour->m_pixel = exact_def.pixel;
	    }
	    glIndexi(pix);
	}
    }
}

void wxGLContext::SetupPixelFormat()
{
}

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

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


/*
 * GLCanvas implementation
 */

IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)

BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
//    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 )
: wxScrolledWindow(parent, id, pos, size, style, name)
{
    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 )
: wxScrolledWindow(parent, id, pos, size, style, name)
{			
    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 )
: wxScrolledWindow(parent, id, pos, size, style, name)
{			
    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 = -1, const wxPoint& pos,
  const wxSize& size, long style, 
  const wxString& name, int *attribList, const wxPalette& palette):
    wxScrolledWindow(parent, id, pos, size, style, name)
*/

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)
{
    XVisualInfo *vi, vi_templ;
    XWindowAttributes xwa;
    int val, n;

    m_sharedContext = (wxGLContext*)shared;  // const_cast
    m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
    m_glContext = (wxGLContext*) NULL;

    Display* display = (Display*) GetXDisplay();

    // Check for the presence of the GLX extension
    if(!glXQueryExtension(display, NULL, NULL)) {
	wxLogError("wxGLCanvas: GLX extension is missing\n");
	return false;
    }

    if(attribList) {
      int data[512], arg=0, p=0;
       
      while( (attribList[arg]!=0) && (p<512) )
      {
        switch( attribList[arg++] )
        {
          case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
          case WX_GL_BUFFER_SIZE:
            data[p++]=GLX_BUFFER_SIZE; data[p++]=attribList[arg++]; break;
          case WX_GL_LEVEL:
            data[p++]=GLX_LEVEL; data[p++]=attribList[arg++]; break;
          case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
          case WX_GL_STEREO: data[p++] = GLX_STEREO; break;
          case WX_GL_AUX_BUFFERS:
            data[p++]=GLX_AUX_BUFFERS; data[p++]=attribList[arg++]; break;
          case WX_GL_MIN_RED:
            data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
          case WX_GL_MIN_GREEN:
            data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
          case WX_GL_MIN_BLUE:
            data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
          case WX_GL_MIN_ALPHA:
            data[p++]=GLX_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
          case WX_GL_DEPTH_SIZE: 
            data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
          case WX_GL_STENCIL_SIZE: 
            data[p++]=GLX_STENCIL_SIZE; data[p++]=attribList[arg++]; break;
          case WX_GL_MIN_ACCUM_RED:
            data[p++]=GLX_ACCUM_RED_SIZE; data[p++]=attribList[arg++]; break;
          case WX_GL_MIN_ACCUM_GREEN:
            data[p++]=GLX_ACCUM_GREEN_SIZE; data[p++]=attribList[arg++]; break;
          case WX_GL_MIN_ACCUM_BLUE:
            data[p++]=GLX_ACCUM_BLUE_SIZE; data[p++]=attribList[arg++]; break;
          case WX_GL_MIN_ACCUM_ALPHA:
            data[p++]=GLX_ACCUM_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
          default:
            break;
        }
      }       
      data[p] = 0; 

      attribList = (int*) data;
      // Get an appropriate visual
      vi = glXChooseVisual(display, DefaultScreen(display), attribList);
      if(!vi) return false;
      
      // Here we should make sure that vi is the same visual as the
      // one used by the xwindow drawable in wxCanvas.  However,
      // there is currently no mechanism for this in wx_canvs.cc.
    } else {
	// By default, we use the visual of xwindow
        // NI: is this really senseful ? opengl in e.g. color index mode ?
	XGetWindowAttributes(display, (Window) GetXWindow(), &xwa);
	vi_templ.visualid = XVisualIDFromVisual(xwa.visual);
	vi = XGetVisualInfo(display, VisualIDMask, &vi_templ, &n);
	if(!vi) return false;
	glXGetConfig(display, vi, GLX_USE_GL, &val);
	if(!val) return false;
	// Basically, this is it.  It should be possible to use vi
	// in glXCreateContext() below.  But this fails with Mesa.
	// I notified the Mesa author about it; there may be a fix.
#ifdef OLD_MESA
	// Construct an attribute list matching the visual
	int a_list[32];
	n = 0;
	if(vi->c_class==TrueColor || vi->c_class==DirectColor) { // RGBA visual
	    a_list[n++] = GLX_RGBA;
	    a_list[n++] = GLX_RED_SIZE;
	    a_list[n++] = bitcount(vi->red_mask);
	    a_list[n++] = GLX_GREEN_SIZE;
	    a_list[n++] = bitcount(vi->green_mask);
	    a_list[n++] = GLX_BLUE_SIZE;
	    a_list[n++] = bitcount(vi->blue_mask);
	    glXGetConfig(display, vi, GLX_ALPHA_SIZE, &val);
	    a_list[n++] = GLX_ALPHA_SIZE;
	    a_list[n++] = val;
	} else { // Color index visual
	    glXGetConfig(display, vi, GLX_BUFFER_SIZE, &val);
	    a_list[n++] = GLX_BUFFER_SIZE;
	    a_list[n++] = val;
	}
	a_list[n] = None;
	// XFree(vi);
	vi = glXChooseVisual(display, DefaultScreen(display), a_list);
	if(!vi) return false;
#endif /* OLD_MESA */
    }

    m_vi = vi;  // safe for later use
    
    wxCHECK_MSG( m_vi, FALSE, "required visual couldn't be found" );

    // Create the GLX context and make it current

    wxGLContext *share= m_sharedContext;
    if (share==NULL && m_sharedContextOf) 
        share = m_sharedContextOf->GetContext();

    m_glContext = new wxGLContext( TRUE, this, wxNullPalette, share );

#ifndef OLD_MESA
    // XFree(vi);
#endif
    SetCurrent();

    return true;
}

wxGLCanvas::~wxGLCanvas(void)
{
    XVisualInfo *vi = (XVisualInfo *) m_vi;
    
    if (vi) XFree( vi );
    if (m_glContext) delete m_glContext;

    // Display* display = (Display*) GetXDisplay();
    // if(glx_cx) glXDestroyContext(display, glx_cx);
}

void wxGLCanvas::SwapBuffers()
{
    if( m_glContext ) m_glContext->SwapBuffers();

    // Display* display = (Display*) GetXDisplay();
    // if(glx_cx) glXSwapBuffers(display, (Window) GetXWindow());
}

void wxGLCanvas::SetCurrent()
{
    if( m_glContext ) m_glContext->SetCurrent();

    // Display* display = (Display*) GetXDisplay();
    // if(glx_cx) glXMakeCurrent(display, (Window) GetXWindow(), glx_cx);
}

void wxGLCanvas::SetColour(const char *col)
{
    if( m_glContext ) m_glContext->SetColour(col);
}

#endif
    // wxUSE_GLCANVAS
Commit	Line	Data
8b089c5e JS	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: glcanvas.cpp
	3	// Purpose: wxGLCanvas, for using OpenGL with wxWindows 2.0 for Motif.
	4	// Uses the GLX extension.
	5	// Author: Julian Smart and Wolfram Gloger
	6	// Modified by:
	7	// Created: 1995, 1999
	8	// RCS-ID: $Id$
	9	// Copyright: (c) Julian Smart, Wolfram Gloger
f48d169c	10	// Licence: wxWindows licence
8b089c5e JS	11	/////////////////////////////////////////////////////////////////////////////
	12
	13	#ifdef __GNUG__
	14	#pragma implementation "glcanvas.h"
	15	#endif
	16
	17	#include "wx/setup.h"
	18
	19	#if wxUSE_GLCANVAS
	20
	21	#include "wx/glcanvas.h"
	22	#include "wx/utils.h"
	23	#include "wx/app.h"
67a26a1a	24	#include "wx/log.h"
8b089c5e	25
dae752d4 JJ	26	#ifdef __VMS
	27	# pragma message disable nosimpint
	28	#endif
8b089c5e	29	#include <Xm/Xm.h>
dae752d4 JJ	30	#ifdef __VMS
	31	# pragma message enable nosimpint
	32	#endif
8b089c5e JS	33	#include "wx/motif/private.h"
	34
	35	#ifdef OLD_MESA
	36	// workaround for bug in Mesa's glx.c
	37	static int bitcount( unsigned long n )
	38	{
	39	int bits;
	40	for (bits=0; n>0;) {
f48d169c UN	41	if(n & 1) bits++;
f48d169c UN	42	n = n >> 1;
8b089c5e JS	43	}
	44	return bits;
	45	}
	46	#endif
	47
2695b174 UN	48	/*
	49	* GLContext implementation
	50	*/
	51
	52	IMPLEMENT_CLASS(wxGLContext,wxObject)
	53
	54	wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win,
	55	const wxPalette& WXUNUSED(palette) )
	56	{
	57	m_window = win;
	58	// m_widget = win->m_wxwindow;
	59
	60	wxGLCanvas gc = (wxGLCanvas) win;
	61	XVisualInfo vi = (XVisualInfo ) gc->m_vi;
	62
	63	wxCHECK_RET( vi, "invalid visual for OpenGl" );
	64
	65	m_glContext = glXCreateContext( (Display *)m_window->GetXDisplay(), vi,
	66	None, GL_TRUE);
	67
	68	wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
	69	}
	70
	71	wxGLContext::wxGLContext(
	72	bool WXUNUSED(isRGB), wxWindow *win,
	73	const wxPalette& WXUNUSED(palette),
	74	const wxGLContext other / for sharing display lists */
	75	)
	76	{
	77	m_window = win;
	78	// m_widget = win->m_wxwindow;
	79
	80	wxGLCanvas gc = (wxGLCanvas) win;
	81	XVisualInfo vi = (XVisualInfo ) gc->m_vi;
	82
	83	wxCHECK_RET( vi, "invalid visual for OpenGl" );
	84
	85	if( other != 0 )
	86	m_glContext = glXCreateContext( (Display *)m_window->GetXDisplay(), vi,
	87	other->m_glContext, GL_TRUE );
	88	else
	89	m_glContext = glXCreateContext( (Display *)m_window->GetXDisplay(), vi,
	90	None, GL_TRUE );
	91
	92	wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
	93	}
	94
	95	wxGLContext::~wxGLContext()
	96	{
	97	if (!m_glContext) return;
	98
	99	if (m_glContext == glXGetCurrentContext())
	100	{
	101	glXMakeCurrent( (Display*) m_window->GetXDisplay(), None, NULL);
	102	}
	103
	104	glXDestroyContext( (Display*) m_window->GetXDisplay(), m_glContext );
	105	}
	106
	107	void wxGLContext::SwapBuffers()
	108	{
	109	if (m_glContext)
	110	{
	111	Display* display = (Display*) m_window->GetXDisplay();
112	glXSwapBuffers(display, (Window) m_window->GetXWindow());
113	}
114	}
115
116	void wxGLContext::SetCurrent()
117	{
118	if (m_glContext)
119	{
120	Display* display = (Display*) m_window->GetXDisplay();
121	glXMakeCurrent(display, (Window) m_window->GetXWindow(),
122	m_glContext );;
123	}
124	}
125
126	void wxGLContext::SetColour(const char *colour)
127	{
128	wxColour *the_colour = wxTheColourDatabase->FindColour(colour);
129	if(the_colour) {
130	GLboolean b;
131	glGetBooleanv(GL_RGBA_MODE, &b);
132	if(b) {
133	glColor3ub(the_colour->Red(),
134	the_colour->Green(),
135	the_colour->Blue());
136	} else {
137	GLint pix = (GLint)the_colour->m_pixel;
138	if(pix == -1) {
139	XColor exact_def;
140	exact_def.red = (unsigned short)the_colour->Red() << 8;
141	exact_def.green = (unsigned short)the_colour->Green() << 8;
142	exact_def.blue = (unsigned short)the_colour->Blue() << 8;
143	exact_def.flags = DoRed \| DoGreen \| DoBlue;
144	if(!XAllocColor((Display*) m_window->GetXDisplay(),
145	(Colormap) wxTheApp->GetMainColormap(m_window->GetXDisplay()),
146	&exact_def)) {
b64c9793	147	wxLogError("wxGLCanvas: cannot allocate color\n");
2695b174 UN	148	return;
	149	}
	150	pix = the_colour->m_pixel = exact_def.pixel;
	151	}
	152	glIndexi(pix);
	153	}
	154	}
	155	}
	156
	157	void wxGLContext::SetupPixelFormat()
	158	{
	159	}
	160
	161	void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
	162	{
	163	}
	164
	165	wxPalette wxGLContext::CreateDefaultPalette()
	166	{
	167	return wxNullPalette;
	168	}
	169
	170
	171
	172
8b089c5e JS	173	/*
	174	* GLCanvas implementation
	175	*/
	176
	177	IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
	178
2695b174 UN	179	BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
	180	// EVT_SIZE(wxGLCanvas::OnSize)
	181	END_EVENT_TABLE()
	182
	183
	184	wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
	185	const wxPoint& pos, const wxSize& size,
	186	long style, const wxString& name,
	187	int *attribList,
	188	const wxPalette& palette )
	189	: wxScrolledWindow(parent, id, pos, size, style, name)
	190	{
	191	Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
	192	}
	193
	194	wxGLCanvas::wxGLCanvas( wxWindow *parent,
	195	const wxGLContext *shared,
	196	wxWindowID id,
	197	const wxPoint& pos, const wxSize& size,
	198	long style, const wxString& name,
	199	int *attribList,
	200	const wxPalette& palette )
	201	: wxScrolledWindow(parent, id, pos, size, style, name)
	202	{
	203	Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
	204	}
	205
	206	wxGLCanvas::wxGLCanvas( wxWindow *parent,
	207	const wxGLCanvas *shared,
	208	wxWindowID id,
	209	const wxPoint& pos, const wxSize& size,
	210	long style, const wxString& name,
	211	int *attribList,
	212	const wxPalette& palette )
	213	: wxScrolledWindow(parent, id, pos, size, style, name)
	214	{
	215	Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
	216	}
	217
	218
	219	/*
	220	bool wxGLCanvas::Create(wxWindow *parent,
	221	const wxGLContext shared, const wxGLCanvas shared_context_of,
	222	wxWindowID id = -1, const wxPoint& pos,
f48d169c UN	223	const wxSize& size, long style,
	224	const wxString& name, int *attribList, const wxPalette& palette):
	225	wxScrolledWindow(parent, id, pos, size, style, name)
2695b174 UN	226	*/
	227
	228	bool wxGLCanvas::Create( wxWindow *parent,
	229	const wxGLContext *shared,
	230	const wxGLCanvas *shared_context_of,
	231	wxWindowID id,
	232	const wxPoint& pos, const wxSize& size,
	233	long style, const wxString& name,
	234	int *attribList,
	235	const wxPalette& palette)
8b089c5e JS	236	{
	237	XVisualInfo *vi, vi_templ;
	238	XWindowAttributes xwa;
	239	int val, n;
	240
2695b174 UN	241	m_sharedContext = (wxGLContext*)shared; // const_cast
	242	m_sharedContextOf = (wxGLCanvas*)shared_context_of; // const_cast
	243	m_glContext = (wxGLContext*) NULL;
	244
8b089c5e JS	245	Display* display = (Display*) GetXDisplay();
8b089c5e JS	246
8b089c5e JS	247	// Check for the presence of the GLX extension
8b089c5e JS	248	if(!glXQueryExtension(display, NULL, NULL)) {
b64c9793	249	wxLogError("wxGLCanvas: GLX extension is missing\n");
2695b174	250	return false;
8b089c5e JS	251	}
8b089c5e JS	252
f48d169c UN	253	if(attribList) {
	254	int data[512], arg=0, p=0;
	255
	256	while( (attribList[arg]!=0) && (p<512) )
	257	{
	258	switch( attribList[arg++] )
	259	{
	260	case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
	261	case WX_GL_BUFFER_SIZE:
	262	data[p++]=GLX_BUFFER_SIZE; data[p++]=attribList[arg++]; break;
	263	case WX_GL_LEVEL:
	264	data[p++]=GLX_LEVEL; data[p++]=attribList[arg++]; break;
	265	case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
	266	case WX_GL_STEREO: data[p++] = GLX_STEREO; break;
	267	case WX_GL_AUX_BUFFERS:
	268	data[p++]=GLX_AUX_BUFFERS; data[p++]=attribList[arg++]; break;
	269	case WX_GL_MIN_RED:
	270	data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
	271	case WX_GL_MIN_GREEN:
	272	data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
	273	case WX_GL_MIN_BLUE:
	274	data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
	275	case WX_GL_MIN_ALPHA:
	276	data[p++]=GLX_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
	277	case WX_GL_DEPTH_SIZE:
	278	data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
	279	case WX_GL_STENCIL_SIZE:
	280	data[p++]=GLX_STENCIL_SIZE; data[p++]=attribList[arg++]; break;
	281	case WX_GL_MIN_ACCUM_RED:
	282	data[p++]=GLX_ACCUM_RED_SIZE; data[p++]=attribList[arg++]; break;
	283	case WX_GL_MIN_ACCUM_GREEN:
	284	data[p++]=GLX_ACCUM_GREEN_SIZE; data[p++]=attribList[arg++]; break;
	285	case WX_GL_MIN_ACCUM_BLUE:
	286	data[p++]=GLX_ACCUM_BLUE_SIZE; data[p++]=attribList[arg++]; break;
	287	case WX_GL_MIN_ACCUM_ALPHA:
	288	data[p++]=GLX_ACCUM_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
	289	default:
	290	break;
	291	}
	292	}
	293	data[p] = 0;
	294
	295	attribList = (int*) data;
	296	// Get an appropriate visual
	297	vi = glXChooseVisual(display, DefaultScreen(display), attribList);
2695b174	298	if(!vi) return false;
f48d169c UN	299
	300	// Here we should make sure that vi is the same visual as the
	301	// one used by the xwindow drawable in wxCanvas. However,
	302	// there is currently no mechanism for this in wx_canvs.cc.
8b089c5e	303	} else {
f48d169c UN	304	// By default, we use the visual of xwindow
	305	// NI: is this really senseful ? opengl in e.g. color index mode ?
	306	XGetWindowAttributes(display, (Window) GetXWindow(), &xwa);
	307	vi_templ.visualid = XVisualIDFromVisual(xwa.visual);
	308	vi = XGetVisualInfo(display, VisualIDMask, &vi_templ, &n);
2695b174	309	if(!vi) return false;
f48d169c	310	glXGetConfig(display, vi, GLX_USE_GL, &val);
2695b174	311	if(!val) return false;
f48d169c UN	312	// Basically, this is it. It should be possible to use vi
	313	// in glXCreateContext() below. But this fails with Mesa.
	314	// I notified the Mesa author about it; there may be a fix.
8b089c5e	315	#ifdef OLD_MESA
f48d169c UN	316	// Construct an attribute list matching the visual
	317	int a_list[32];
	318	n = 0;
	319	if(vi->c_class==TrueColor \|\| vi->c_class==DirectColor) { // RGBA visual
	320	a_list[n++] = GLX_RGBA;
	321	a_list[n++] = GLX_RED_SIZE;
	322	a_list[n++] = bitcount(vi->red_mask);
	323	a_list[n++] = GLX_GREEN_SIZE;
	324	a_list[n++] = bitcount(vi->green_mask);
	325	a_list[n++] = GLX_BLUE_SIZE;
	326	a_list[n++] = bitcount(vi->blue_mask);
	327	glXGetConfig(display, vi, GLX_ALPHA_SIZE, &val);
	328	a_list[n++] = GLX_ALPHA_SIZE;
	329	a_list[n++] = val;
	330	} else { // Color index visual
	331	glXGetConfig(display, vi, GLX_BUFFER_SIZE, &val);
	332	a_list[n++] = GLX_BUFFER_SIZE;
	333	a_list[n++] = val;
	334	}
	335	a_list[n] = None;
2695b174	336	// XFree(vi);
f48d169c	337	vi = glXChooseVisual(display, DefaultScreen(display), a_list);
2695b174	338	if(!vi) return false;
8b089c5e JS	339	#endif /* OLD_MESA */
	340	}
	341
2695b174 UN	342	m_vi = vi; // safe for later use
	343
	344	wxCHECK_MSG( m_vi, FALSE, "required visual couldn't be found" );
	345
8b089c5e	346	// Create the GLX context and make it current
2695b174 UN	347
	348	wxGLContext *share= m_sharedContext;
	349	if (share==NULL && m_sharedContextOf)
	350	share = m_sharedContextOf->GetContext();
	351
	352	m_glContext = new wxGLContext( TRUE, this, wxNullPalette, share );
	353
8b089c5e	354	#ifndef OLD_MESA
2695b174	355	// XFree(vi);
8b089c5e JS	356	#endif
8b089c5e JS	357	SetCurrent();
2695b174 UN	358
2695b174 UN	359	return true;
8b089c5e JS	360	}
	361
	362	wxGLCanvas::~wxGLCanvas(void)
	363	{
2695b174 UN	364	XVisualInfo vi = (XVisualInfo ) m_vi;
	365
	366	if (vi) XFree( vi );
	367	if (m_glContext) delete m_glContext;
	368
	369	// Display* display = (Display*) GetXDisplay();
	370	// if(glx_cx) glXDestroyContext(display, glx_cx);
8b089c5e JS	371	}
	372
	373	void wxGLCanvas::SwapBuffers()
	374	{
2695b174 UN	375	if( m_glContext ) m_glContext->SwapBuffers();
	376
	377	// Display* display = (Display*) GetXDisplay();
	378	// if(glx_cx) glXSwapBuffers(display, (Window) GetXWindow());
8b089c5e JS	379	}
	380
	381	void wxGLCanvas::SetCurrent()
	382	{
2695b174 UN	383	if( m_glContext ) m_glContext->SetCurrent();
	384
	385	// Display* display = (Display*) GetXDisplay();
	386	// if(glx_cx) glXMakeCurrent(display, (Window) GetXWindow(), glx_cx);
8b089c5e JS	387	}
	388
	389	void wxGLCanvas::SetColour(const char *col)
	390	{
2695b174	391	if( m_glContext ) m_glContext->SetColour(col);
8b089c5e JS	392	}
	393
	394	#endif
	395	// wxUSE_GLCANVAS
	396