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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2006 William Jon McCann <mccann@jhu.edu>
* Copyright (C) 1999, 2000, 2003 Jamie Zawinski <jwz@jwz.org>
* Copyright (C) 2012-2021 MATE Developers
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*/
#include "config.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#ifdef HAVE_LIBGL
#include <GL/gl.h>
#include <GL/glx.h>
#endif /* HAVE_GL */
#include "gs-visual-gl.h"
#include "gs-debug.h"
GdkVisual *
gs_visual_gl_get_best_for_display (GdkDisplay *display)
{
GdkVisual *visual;
#ifdef HAVE_LIBGL
Display *xdisplay;
GdkScreen *screen;
int screen_num;
int i;
# define R GLX_RED_SIZE
# define G GLX_GREEN_SIZE
# define B GLX_BLUE_SIZE
# define D GLX_DEPTH_SIZE
# define I GLX_BUFFER_SIZE
# define DB GLX_DOUBLEBUFFER
# define ST GLX_STENCIL_SIZE
static int attrs [][20] =
{
{ GLX_RGBA, R, 8, G, 8, B, 8, D, 8, DB, ST,1, 0 }, /* rgb double, stencil */
{ GLX_RGBA, R, 4, G, 4, B, 4, D, 4, DB, ST,1, 0 },
{ GLX_RGBA, R, 2, G, 2, B, 2, D, 2, DB, ST,1, 0 },
{ GLX_RGBA, R, 8, G, 8, B, 8, D, 8, DB, 0 }, /* rgb double */
{ GLX_RGBA, R, 4, G, 4, B, 4, D, 4, DB, 0 },
{ GLX_RGBA, R, 2, G, 2, B, 2, D, 2, DB, 0 },
{ GLX_RGBA, R, 8, G, 8, B, 8, D, 8, 0 }, /* rgb single */
{ GLX_RGBA, R, 4, G, 4, B, 4, D, 4, 0 },
{ GLX_RGBA, R, 2, G, 2, B, 2, D, 2, 0 },
{ I, 8, D, 8, DB, 0 }, /* cmap double */
{ I, 4, D, 4, DB, 0 },
{ I, 8, D, 8, 0 }, /* cmap single */
{ I, 4, D, 4, 0 },
{ GLX_RGBA, R, 1, G, 1, B, 1, D, 1, 0 } /* monochrome */
};
g_return_val_if_fail (display != NULL, NULL);
xdisplay = GDK_DISPLAY_XDISPLAY (display);
screen = gdk_display_get_default_screen (display);
screen_num = GDK_SCREEN_XNUMBER (screen);
gdk_x11_display_error_trap_push (display);
visual = NULL;
for (i = 0; i < G_N_ELEMENTS (attrs); i++)
{
XVisualInfo *vi;
vi = glXChooseVisual (xdisplay, screen_num, attrs [i]);
if (vi != NULL)
{
VisualID vid;
vid = XVisualIDFromVisual (vi->visual);
visual = gdk_x11_screen_lookup_visual (screen, vid);
XFree (vi);
if (visual != NULL)
{
break;
}
}
}
gdk_x11_display_error_trap_pop_ignored (display);
#else
visual = NULL;
#endif /* HAVE_LIBGL */
return visual;
}
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