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/* GtkGLExt - OpenGL Extension to GTK+
* Copyright (C) 2002-2004 Naofumi Yasufuku
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <string.h>
#include "gtkglprivate.h"
#include "gtkglinit.h"
static gboolean gtk_gl_initialized = FALSE;
guint gtk_gl_debug_flags = 0; /* Global GtkGLExt debug flag */
#ifdef G_ENABLE_DEBUG
static const GDebugKey gtk_gl_debug_keys[] = {
{"misc", GTK_GL_DEBUG_MISC},
{"func", GTK_GL_DEBUG_FUNC}
};
static const guint gtk_gl_ndebug_keys = G_N_ELEMENTS (gtk_gl_debug_keys);
#endif /* G_ENABLE_DEBUG */
/**
* gtk_gl_parse_args:
* @argc: the number of command line arguments.
* @argv: the array of command line arguments.
*
* Parses command line arguments, and initializes global
* attributes of GtkGLExt.
*
* Any arguments used by GtkGLExt are removed from the array and
* @argc and @argv are updated accordingly.
*
* You shouldn't call this function explicitely if you are using
* gtk_gl_init(), or gtk_gl_init_check().
**/
static void
gtk_gl_parse_args (int *argc,
char ***argv)
{
const gchar *env_string;
if (gtk_gl_initialized)
return;
/*
* If window manager doesn't watch the WM_COLORMAP_WINDOWS property on
* the top-level window, we have to set OpenGL window's colormap to the
* top-level window, especially in color index mode (color index mode
* uses own private colormap). This is achieved by setting the window's
* visual.
*/
env_string = g_getenv ("GTK_GL_INSTALL_VISUAL");
if (env_string != NULL)
{
_gtk_gl_widget_install_toplevel_visual = !!g_ascii_strtoll (env_string, NULL, 0);
env_string = NULL;
}
#ifdef G_ENABLE_DEBUG
env_string = g_getenv ("GTK_GL_DEBUG");
if (env_string != NULL)
{
gtk_gl_debug_flags = g_parse_debug_string (env_string,
gtk_gl_debug_keys,
gtk_gl_ndebug_keys);
env_string = NULL;
}
#endif /* G_ENABLE_DEBUG */
if (argc && argv)
{
gint i, j, k;
for (i = 1; i < *argc;)
{
if (strcmp ("--gtk-gl-install-visual", (*argv)[i]) == 0)
{
_gtk_gl_widget_install_toplevel_visual = TRUE;
(*argv)[i] = NULL;
}
#ifdef G_ENABLE_DEBUG
else if ((strcmp ("--gtk-gl-debug", (*argv)[i]) == 0) ||
(strncmp ("--gtk-gl-debug=", (*argv)[i], 15) == 0))
{
gchar *equal_pos = strchr ((*argv)[i], '=');
if (equal_pos != NULL)
{
gtk_gl_debug_flags |= g_parse_debug_string (equal_pos+1,
gtk_gl_debug_keys,
gtk_gl_ndebug_keys);
}
else if ((i + 1) < *argc && (*argv)[i + 1])
{
gtk_gl_debug_flags |= g_parse_debug_string ((*argv)[i+1],
gtk_gl_debug_keys,
gtk_gl_ndebug_keys);
(*argv)[i] = NULL;
i += 1;
}
(*argv)[i] = NULL;
}
else if ((strcmp ("--gtk-gl-no-debug", (*argv)[i]) == 0) ||
(strncmp ("--gtk-gl-no-debug=", (*argv)[i], 18) == 0))
{
gchar *equal_pos = strchr ((*argv)[i], '=');
if (equal_pos != NULL)
{
gtk_gl_debug_flags &= ~g_parse_debug_string (equal_pos+1,
gtk_gl_debug_keys,
gtk_gl_ndebug_keys);
}
else if ((i + 1) < *argc && (*argv)[i + 1])
{
gtk_gl_debug_flags &= ~g_parse_debug_string ((*argv)[i+1],
gtk_gl_debug_keys,
gtk_gl_ndebug_keys);
(*argv)[i] = NULL;
i += 1;
}
(*argv)[i] = NULL;
}
#endif /* G_ENABLE_DEBUG */
i += 1;
}
for (i = 1; i < *argc; i++)
{
for (k = i; k < *argc; k++)
if ((*argv)[k] != NULL)
break;
if (k > i)
{
k -= i;
for (j = i + k; j < *argc; j++)
(*argv)[j-k] = (*argv)[j];
*argc -= k;
}
}
}
/* Set the 'initialized' flag. */
gtk_gl_initialized = TRUE;
}
/**
* gtk_gl_init_check:
* @argc: Address of the <parameter>argc</parameter> parameter of your
* <function>main()</function> function. Changed if any arguments
* were handled.
* @argv: Address of the <parameter>argv</parameter> parameter of
* <function>main()</function>. Any parameters understood by
* gtk_gl_init() are stripped before return.
*
* This function does the same work as gtk_gl_init() with only
* a single change: It does not terminate the program if the library can't be
* initialized. Instead it returns %FALSE on failure.
*
* This way the application can fall back to some other means of communication
* with the user - for example a curses or command line interface.
*
* Return value: %TRUE if the GUI has been successfully initialized,
* %FALSE otherwise.
**/
gboolean
gtk_gl_init_check (int *argc,
char ***argv)
{
/* Init GdkGLExt library. */
if (!gdk_gl_init_check (argc, argv))
return FALSE;
/* Parse args and init GtkGLExt library. */
gtk_gl_parse_args (argc, argv);
return TRUE;
}
/**
* gtk_gl_init:
* @argc: Address of the <parameter>argc</parameter> parameter of your
* <function>main()</function> function. Changed if any arguments
* were handled.
* @argv: Address of the <parameter>argv</parameter> parameter of
* <function>main()</function>. Any parameters understood by
* gtk_gl_init() are stripped before return.
*
* Call this function before using any other GtkGLExt functions in your
* applications. It will initialize everything needed to operate the library
* and parses some standard command line options. @argc and
* @argv are adjusted accordingly so your own code will
* never see those standard arguments.
*
* <note><para>
* This function will terminate your program if it was unable to initialize
* the library for some reason. If you want your program to fall back to a
* textual interface you want to call gtk_gl_init_check() instead.
* </para></note>
**/
void
gtk_gl_init (int *argc,
char ***argv)
{
if (!gtk_gl_init_check (argc, argv))
g_error ("GdkGLExt library initialization fails.");
}
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