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| /*
* low-level.c:
* Low-level GdkGLExt example. This program uses only gdkgl stuff.
*
* written by Naofumi Yasufuku <naofumi@users.sourceforge.net>
*/
#include <stdlib.h>
#include <gtk/gtk.h>
#include <gdk/gdkgl.h>
#ifdef G_OS_WIN32
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>
#endif
#include <GL/gl.h>
#include <GL/glu.h>
static GdkGLConfig *glconfig = NULL;
static GdkGLWindow *glwindow = NULL;
static GdkGLContext *glcontext = NULL;
static const int config_attributes[] = {
GDK_GL_DOUBLEBUFFER,
GDK_GL_RGBA,
GDK_GL_RED_SIZE, 1,
GDK_GL_GREEN_SIZE, 1,
GDK_GL_BLUE_SIZE, 1,
GDK_GL_DEPTH_SIZE, 12,
GDK_GL_ATTRIB_LIST_NONE
};
static void
realize (GtkWidget *widget,
gpointer data)
{
GLUquadricObj *qobj;
static GLfloat light_diffuse[] = {1.0, 0.0, 0.0, 1.0};
static GLfloat light_position[] = {1.0, 1.0, 1.0, 0.0};
/*
* Create GdkGLWindow for widget->window.
*/
glwindow = gdk_gl_window_new (glconfig,
widget->window,
NULL);
/* Set a background of "None" on window to avoid AIX X server crash */
gdk_window_set_back_pixmap (widget->window, NULL, FALSE);
/*
* Create OpenGL rendering context.
*/
if (glcontext == NULL)
{
glcontext = gdk_gl_context_new (GDK_GL_DRAWABLE (glwindow),
NULL,
TRUE,
GDK_GL_RGBA_TYPE);
if (glcontext == NULL)
{
g_print ("Connot create the OpenGL rendering context\n");
exit (1);
}
g_print ("The OpenGL rendering context is created\n");
}
/*** OpenGL BEGIN ***/
if (!gdk_gl_drawable_gl_begin (GDK_GL_DRAWABLE (glwindow), glcontext))
return;
qobj = gluNewQuadric ();
gluQuadricDrawStyle (qobj, GLU_FILL);
glNewList (1, GL_COMPILE);
gluSphere (qobj, 1.0, 20, 20);
glEndList ();
glLightfv (GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv (GL_LIGHT0, GL_POSITION, light_position);
glEnable (GL_LIGHTING);
glEnable (GL_LIGHT0);
glEnable (GL_DEPTH_TEST);
glClearColor (1.0, 1.0, 1.0, 1.0);
glClearDepth (1.0);
glViewport (0, 0,
widget->allocation.width, widget->allocation.height);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gluPerspective (40.0, 1.0, 1.0, 10.0);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
gluLookAt (0.0, 0.0, 3.0,
0.0, 0.0, 0.0,
0.0, 1.0, 0.0);
glTranslatef (0.0, 0.0, -3.0);
gdk_gl_drawable_gl_end (GDK_GL_DRAWABLE (glwindow));
/*** OpenGL END ***/
}
static void
size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
gpointer data)
{
/* Synchronize OpenGL rendering pipeline on resizing X window. */
if (glwindow != NULL)
gdk_gl_drawable_wait_gdk (GDK_GL_DRAWABLE (glwindow));
}
static gboolean
configure_event (GtkWidget *widget,
GdkEventConfigure *event,
gpointer data)
{
/* gtk_drawing_area sends configure_event when it is realized. */
if (glwindow == NULL)
return FALSE;
/*** OpenGL BEGIN ***/
if (!gdk_gl_drawable_gl_begin (GDK_GL_DRAWABLE (glwindow), glcontext))
return FALSE;
glViewport (0, 0,
widget->allocation.width, widget->allocation.height);
gdk_gl_drawable_gl_end (GDK_GL_DRAWABLE (glwindow));
/*** OpenGL END ***/
return TRUE;
}
static gboolean
expose_event (GtkWidget *widget,
GdkEventExpose *event,
gpointer data)
{
/*** OpenGL BEGIN ***/
if (!gdk_gl_drawable_gl_begin (GDK_GL_DRAWABLE (glwindow), glcontext))
return FALSE;
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glCallList (1);
if (gdk_gl_drawable_is_double_buffered (GDK_GL_DRAWABLE (glwindow)))
gdk_gl_drawable_swap_buffers (GDK_GL_DRAWABLE (glwindow));
else
glFlush ();
gdk_gl_drawable_gl_end (GDK_GL_DRAWABLE (glwindow));
/*** OpenGL END ***/
return TRUE;
}
static void
unrealize (GtkWidget *widget,
gpointer data)
{
if (glcontext != NULL)
{
g_object_unref (G_OBJECT (glcontext));
glcontext = NULL;
}
if (glwindow != NULL)
{
g_object_unref (G_OBJECT (glwindow));
glwindow = NULL;
}
if (glconfig != NULL)
{
g_object_unref (G_OBJECT (glconfig));
glconfig = NULL;
}
}
static void
print_gl_config_attrib (GdkGLConfig *glconfig,
const gchar *attrib_str,
int attrib,
gboolean is_boolean)
{
int value;
g_print ("%s = ", attrib_str);
if (gdk_gl_config_get_attrib (glconfig, attrib, &value))
{
if (is_boolean)
g_print ("%s\n", value == TRUE ? "TRUE" : "FALSE");
else
g_print ("%d\n", value);
}
else
g_print ("*** Cannot get %s attribute value\n", attrib_str);
}
static void
examine_gl_config_attrib (GdkGLConfig *glconfig)
{
g_print ("\nOpenGL visual configurations :\n\n");
g_print ("gdk_gl_config_is_rgba (glconfig) = %s\n",
gdk_gl_config_is_rgba (glconfig) ? "TRUE" : "FALSE");
g_print ("gdk_gl_config_is_double_buffered (glconfig) = %s\n",
gdk_gl_config_is_double_buffered (glconfig) ? "TRUE" : "FALSE");
g_print ("gdk_gl_config_is_stereo (glconfig) = %s\n",
gdk_gl_config_is_stereo (glconfig) ? "TRUE" : "FALSE");
g_print ("gdk_gl_config_has_alpha (glconfig) = %s\n",
gdk_gl_config_has_alpha (glconfig) ? "TRUE" : "FALSE");
g_print ("gdk_gl_config_has_depth_buffer (glconfig) = %s\n",
gdk_gl_config_has_depth_buffer (glconfig) ? "TRUE" : "FALSE");
g_print ("gdk_gl_config_has_stencil_buffer (glconfig) = %s\n",
gdk_gl_config_has_stencil_buffer (glconfig) ? "TRUE" : "FALSE");
g_print ("gdk_gl_config_has_accum_buffer (glconfig) = %s\n",
gdk_gl_config_has_accum_buffer (glconfig) ? "TRUE" : "FALSE");
g_print ("\n");
print_gl_config_attrib (glconfig, "GDK_GL_USE_GL", GDK_GL_USE_GL, TRUE);
print_gl_config_attrib (glconfig, "GDK_GL_BUFFER_SIZE", GDK_GL_BUFFER_SIZE, FALSE);
print_gl_config_attrib (glconfig, "GDK_GL_LEVEL", GDK_GL_LEVEL, FALSE);
print_gl_config_attrib (glconfig, "GDK_GL_RGBA", GDK_GL_RGBA, TRUE);
print_gl_config_attrib (glconfig, "GDK_GL_DOUBLEBUFFER", GDK_GL_DOUBLEBUFFER, TRUE);
print_gl_config_attrib (glconfig, "GDK_GL_STEREO", GDK_GL_STEREO, TRUE);
print_gl_config_attrib (glconfig, "GDK_GL_AUX_BUFFERS", GDK_GL_AUX_BUFFERS, FALSE);
print_gl_config_attrib (glconfig, "GDK_GL_RED_SIZE", GDK_GL_RED_SIZE, FALSE);
print_gl_config_attrib (glconfig, "GDK_GL_GREEN_SIZE", GDK_GL_GREEN_SIZE, FALSE);
print_gl_config_attrib (glconfig, "GDK_GL_BLUE_SIZE", GDK_GL_BLUE_SIZE, FALSE);
print_gl_config_attrib (glconfig, "GDK_GL_ALPHA_SIZE", GDK_GL_ALPHA_SIZE, FALSE);
print_gl_config_attrib (glconfig, "GDK_GL_DEPTH_SIZE", GDK_GL_DEPTH_SIZE, FALSE);
print_gl_config_attrib (glconfig, "GDK_GL_STENCIL_SIZE", GDK_GL_STENCIL_SIZE, FALSE);
print_gl_config_attrib (glconfig, "GDK_GL_ACCUM_RED_SIZE", GDK_GL_ACCUM_RED_SIZE, FALSE);
print_gl_config_attrib (glconfig, "GDK_GL_ACCUM_GREEN_SIZE", GDK_GL_ACCUM_GREEN_SIZE, FALSE);
print_gl_config_attrib (glconfig, "GDK_GL_ACCUM_BLUE_SIZE", GDK_GL_ACCUM_BLUE_SIZE, FALSE);
print_gl_config_attrib (glconfig, "GDK_GL_ACCUM_ALPHA_SIZE", GDK_GL_ACCUM_ALPHA_SIZE, FALSE);
g_print ("\n");
}
int
main (int argc,
char *argv[])
{
gint major, minor;
GtkWidget *window;
GtkWidget *vbox;
GtkWidget *drawing_area;
GtkWidget *button;
/*
* Init GTK.
*/
gtk_init (&argc, &argv);
/*
* Init GdkGLExt.
*/
gdk_gl_init (&argc, &argv);
/*
* Query OpenGL extension version.
*/
gdk_gl_query_version (&major, &minor);
g_print ("\nOpenGL extension version - %d.%d\n",
major, minor);
/*
* Configure OpenGL-capable visual.
*/
/* Try double-buffered visual */
glconfig = gdk_gl_config_new (&config_attributes[0]);
if (glconfig == NULL)
{
g_print ("*** Cannot find the double-buffered visual.\n");
g_print ("*** Trying single-buffered visual.\n");
/* Try single-buffered visual */
glconfig = gdk_gl_config_new (&config_attributes[1]);
if (glconfig == NULL)
{
g_print ("*** No appropriate OpenGL-capable visual found.\n");
exit (1);
}
}
examine_gl_config_attrib (glconfig);
/*
* Top-level window.
*/
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "low-level");
/*
* 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.
*/
gtk_widget_set_colormap (window,
gdk_gl_config_get_colormap (glconfig));
/* Get automatically redrawn if any of their children changed allocation. */
gtk_container_set_reallocate_redraws (GTK_CONTAINER (window), TRUE);
g_signal_connect (G_OBJECT (window), "delete_event",
G_CALLBACK (gtk_main_quit), NULL);
/*
* VBox.
*/
vbox = gtk_vbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (window), vbox);
gtk_widget_show (vbox);
/*
* Drawing area for drawing OpenGL scene.
*/
drawing_area = gtk_drawing_area_new ();
gtk_widget_set_size_request (drawing_area, 200, 200);
/* Set OpenGL-capable colormap. */
gtk_widget_set_colormap (drawing_area,
gdk_gl_config_get_colormap (glconfig));
/* Disable backing store feature of the widget. */
gtk_widget_set_double_buffered (drawing_area, FALSE);
g_signal_connect_after (G_OBJECT (drawing_area), "realize",
G_CALLBACK (realize), NULL);
g_signal_connect (G_OBJECT (drawing_area), "size_allocate",
G_CALLBACK (size_allocate), NULL);
g_signal_connect (G_OBJECT (drawing_area), "configure_event",
G_CALLBACK (configure_event), NULL);
g_signal_connect (G_OBJECT (drawing_area), "expose_event",
G_CALLBACK (expose_event), NULL);
g_signal_connect (G_OBJECT (drawing_area), "unrealize",
G_CALLBACK (unrealize), NULL);
gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
gtk_widget_show (drawing_area);
/*
* Simple quit button.
*/
button = gtk_button_new_with_label ("Quit");
g_signal_connect (G_OBJECT (button), "clicked",
G_CALLBACK (gtk_main_quit), NULL);
gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
/*
* Show window.
*/
gtk_widget_show (window);
/*
* Main loop.
*/
/* Destroy the GLX context explicitly when application is terminated. */
gtk_quit_add_destroy (gtk_main_level () + 1,
GTK_OBJECT (drawing_area));
gtk_main ();
return 0;
} |
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