[gtk+/wip/gdk-gl: 4/31] gtk: Add a GL drawing widget
- From: Emmanuele Bassi <ebassi src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/wip/gdk-gl: 4/31] gtk: Add a GL drawing widget
- Date: Thu, 14 Aug 2014 11:12:39 +0000 (UTC)
commit ffcd7983aa6a993e00dae794b17ea32062cf9f68
Author: Emmanuele Bassi <ebassi gnome org>
Date: Mon Aug 11 11:34:05 2014 +0100
gtk: Add a GL drawing widget
https://bugzilla.gnome.org/show_bug.cgi?id=119189
gtk/Makefile.am | 2 +
gtk/gtk.h | 1 +
gtk/gtkglarea.c | 483 ++++++++++++++++++++++++++++++++++++++++++++++++
gtk/gtkglarea.h | 80 ++++++++
gtk/gtkmarshalers.list | 1 +
tests/Makefile.am | 1 +
tests/testglarea.c | 57 ++++++
7 files changed, 625 insertions(+), 0 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 5c31084..a0de7d1 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -365,6 +365,7 @@ gtk_public_h_sources = \
gtkgesturesingle.h \
gtkgestureswipe.h \
gtkgesturezoom.h \
+ gtkglarea.h \
gtkgrid.h \
gtkheaderbar.h \
gtkicontheme.h \
@@ -937,6 +938,7 @@ gtk_base_c_sources = \
gtkgesturesingle.c \
gtkgestureswipe.c \
gtkgesturezoom.c \
+ gtkglarea.c \
gtkgrid.c \
gtkheaderbar.c \
gtkhsla.c \
diff --git a/gtk/gtk.h b/gtk/gtk.h
index a6ec45f..3b48b68 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -114,6 +114,7 @@
#include <gtk/gtkgesturesingle.h>
#include <gtk/gtkgestureswipe.h>
#include <gtk/gtkgesturezoom.h>
+#include <gtk/gtkglarea.h>
#include <gtk/gtkgrid.h>
#include <gtk/gtkheaderbar.h>
#include <gtk/gtkicontheme.h>
diff --git a/gtk/gtkglarea.c b/gtk/gtkglarea.c
new file mode 100644
index 0000000..d020d28
--- /dev/null
+++ b/gtk/gtkglarea.c
@@ -0,0 +1,483 @@
+#include "config.h"
+
+#include "config.h"
+#include "gtkglarea.h"
+#include "gtkintl.h"
+#include "gtkstylecontext.h"
+#include "gtkmarshalers.h"
+#include "gtkprivate.h"
+
+/**
+ * SECTION:gtkglarea
+ * @Title: GtkGLArea
+ * @Short_description: A widget for custom drawing with OpenGL
+ *
+ * #GtkGLArea is a widget that allows drawing with OpenGL.
+ *
+ * #GtkGLArea can set up its own #GdkGLContext using a provided
+ * #GdkGLPixelFormat, or can use a given #GdkGLContext.
+ *
+ * In order to draw, you have to connect to the #GtkGLArea::draw-with-context
+ * signal, or subclass #GtkGLArea and override the @GtkGLAreaClass.draw_with_context
+ * virtual function.
+ *
+ * The #GtkGLArea widget ensures that the #GdkGLContext is associated with the
+ * widget's drawing area, and it is kept updated when the size and position of
+ * the drawing area changes.
+ */
+
+typedef struct {
+ GdkGLPixelFormat *pixel_format;
+ GdkGLContext *context;
+} GtkGLAreaPrivate;
+
+enum {
+ PROP_0,
+
+ PROP_PIXEL_FORMAT,
+ PROP_CONTEXT,
+
+ LAST_PROP
+};
+
+static GParamSpec *obj_props[LAST_PROP] = { NULL, };
+
+enum {
+ RENDER,
+ CREATE_CONTEXT,
+
+ LAST_SIGNAL
+};
+
+static guint area_signals[LAST_SIGNAL] = { 0, };
+
+G_DEFINE_TYPE_WITH_PRIVATE (GtkGLArea, gtk_gl_area, GTK_TYPE_WIDGET)
+
+static void
+gtk_gl_area_dispose (GObject *gobject)
+{
+ GtkGLArea *self = GTK_GL_AREA (gobject);
+ GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (self);
+
+ g_clear_object (&priv->pixel_format);
+ g_clear_object (&priv->context);
+
+ G_OBJECT_CLASS (gtk_gl_area_parent_class)->dispose (gobject);
+}
+
+static void
+gtk_gl_area_set_property (GObject *gobject,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GtkGLArea *self = GTK_GL_AREA (gobject);
+ GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (self);
+
+ switch (prop_id)
+ {
+ case PROP_PIXEL_FORMAT:
+ priv->pixel_format = g_value_dup_object (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
+ }
+}
+
+static void
+gtk_gl_area_get_property (GObject *gobject,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (GTK_GL_AREA (gobject));
+
+ switch (prop_id)
+ {
+ case PROP_PIXEL_FORMAT:
+ g_value_set_object (value, priv->pixel_format);
+ break;
+
+ case PROP_CONTEXT:
+ g_value_set_object (value, priv->context);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
+ }
+}
+
+static GdkGLContext *
+gtk_gl_area_create_context (GtkGLArea *area)
+{
+ GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
+ GdkGLContext *context;
+
+ if (priv->context != NULL)
+ return priv->context;
+
+ context = NULL;
+ g_signal_emit (area, area_signals[CREATE_CONTEXT], 0,
+ priv->pixel_format,
+ &context);
+
+ if (context == NULL)
+ {
+ g_critical ("No GL context was created for the widget");
+ return NULL;
+ }
+
+ gtk_widget_set_visual (GTK_WIDGET (area), gdk_gl_context_get_visual (context));
+
+ priv->context = context;
+
+ return priv->context;
+}
+
+static void
+gtk_gl_area_realize (GtkWidget *widget)
+{
+ GdkGLContext *context;
+ GtkAllocation allocation;
+ GdkWindow *window;
+ GdkWindowAttr attributes;
+ gint attributes_mask;
+
+ gtk_widget_set_realized (widget, TRUE);
+ gtk_widget_get_allocation (widget, &allocation);
+
+ context = gtk_gl_area_create_context (GTK_GL_AREA (widget));
+
+ attributes.window_type = GDK_WINDOW_CHILD;
+ attributes.x = allocation.x;
+ attributes.y = allocation.y;
+ attributes.width = allocation.width;
+ attributes.height = allocation.height;
+ attributes.wclass = GDK_INPUT_OUTPUT;
+ attributes.visual = gtk_widget_get_visual (widget);
+ attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
+
+ attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
+
+ window = gdk_window_new (gtk_widget_get_parent_window (widget),
+ &attributes,
+ attributes_mask);
+ gtk_widget_register_window (widget, window);
+ gtk_widget_set_window (widget, window);
+
+ if (context != NULL)
+ {
+ gdk_gl_context_set_window (context, gtk_widget_get_window (widget));
+ gdk_gl_context_update (context);
+ }
+}
+
+static void
+gtk_gl_area_unrealize (GtkWidget *widget)
+{
+ GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private ((GtkGLArea *) widget);
+
+ if (priv->context != NULL)
+ gdk_gl_context_set_window (priv->context, NULL);
+
+ GTK_WIDGET_CLASS (gtk_gl_area_parent_class)->unrealize (widget);
+}
+
+static void
+gtk_gl_area_size_allocate (GtkWidget *widget,
+ GtkAllocation *allocation)
+{
+ GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private ((GtkGLArea *) widget);
+ GtkAllocation old_alloc;
+ gboolean same_size;
+
+ gtk_widget_get_allocation (widget, &old_alloc);
+ gtk_widget_set_allocation (widget, allocation);
+
+ if (!gtk_widget_get_realized (widget))
+ return;
+
+ same_size = old_alloc.width == allocation->width &&
+ old_alloc.height == allocation->height;
+
+ gdk_window_move_resize (gtk_widget_get_window (widget),
+ allocation->x,
+ allocation->y,
+ allocation->width,
+ allocation->height);
+
+ /* no need to reset the viewport if the size of the window did not change */
+ if (priv->context != NULL && !same_size)
+ gdk_gl_context_update (priv->context);
+}
+
+static gboolean
+gtk_gl_area_draw (GtkWidget *widget,
+ cairo_t *cr)
+{
+ GtkGLArea *self = GTK_GL_AREA (widget);
+ GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (self);
+ gboolean unused;
+
+ if (priv->context == NULL)
+ return FALSE;
+
+ if (!gtk_gl_area_make_current (self))
+ return FALSE;
+
+ g_signal_emit (self, area_signals[RENDER], 0, priv->context, &unused);
+
+ gtk_gl_area_flush_buffer (self);
+
+ return TRUE;
+}
+
+static void
+gtk_gl_area_screen_changed (GtkWidget *widget,
+ GdkScreen *old_screen)
+{
+ GtkGLArea *self = GTK_GL_AREA (widget);
+ GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (self);
+
+ /* this will cause the context to be recreated on realize */
+ g_clear_object (&priv->context);
+}
+
+static GdkGLContext *
+gtk_gl_area_real_create_context (GtkGLArea *area,
+ GdkGLPixelFormat *format)
+{
+ GdkDisplay *display = gtk_widget_get_display (GTK_WIDGET (area));
+ GdkGLContext *retval;
+ GError *error = NULL;
+
+ if (display == NULL)
+ display = gdk_display_get_default ();
+
+ retval = gdk_display_get_gl_context (display, format, NULL, &error);
+ if (error != NULL)
+ {
+ g_critical ("Unable to create a GdkGLContext: %s", error->message);
+ g_error_free (error);
+ return NULL;
+ }
+
+ return retval;
+}
+
+static gboolean
+create_context_accumulator (GSignalInvocationHint *ihint,
+ GValue *return_accu,
+ const GValue *handler_return,
+ gpointer data)
+{
+ g_value_copy (handler_return, return_accu);
+
+ /* stop after the first handler returning a valid object */
+ return g_value_get_object (handler_return) == NULL;
+}
+
+static void
+gtk_gl_area_class_init (GtkGLAreaClass *klass)
+{
+ GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+ klass->create_context = gtk_gl_area_real_create_context;
+
+ widget_class->screen_changed = gtk_gl_area_screen_changed;
+ widget_class->realize = gtk_gl_area_realize;
+ widget_class->unrealize = gtk_gl_area_unrealize;
+ widget_class->size_allocate = gtk_gl_area_size_allocate;
+ widget_class->draw = gtk_gl_area_draw;
+
+ gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_DRAWING_AREA);
+
+ obj_props[PROP_PIXEL_FORMAT] =
+ g_param_spec_object ("pixel-format",
+ P_("Pixel Format"),
+ P_("The GDK pixel format for creating the GL context"),
+ GDK_TYPE_GL_PIXEL_FORMAT,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT_ONLY |
+ G_PARAM_STATIC_STRINGS);
+
+ obj_props[PROP_CONTEXT] =
+ g_param_spec_object ("context",
+ P_("Context"),
+ P_("The GL context"),
+ GDK_TYPE_GL_CONTEXT,
+ G_PARAM_READABLE |
+ G_PARAM_STATIC_STRINGS);
+
+ gobject_class->set_property = gtk_gl_area_set_property;
+ gobject_class->get_property = gtk_gl_area_get_property;
+ gobject_class->dispose = gtk_gl_area_dispose;
+
+ g_object_class_install_properties (gobject_class, LAST_PROP, obj_props);
+
+ area_signals[CREATE_CONTEXT] =
+ g_signal_new (I_("create-context"),
+ G_TYPE_FROM_CLASS (gobject_class),
+ G_SIGNAL_RUN_LAST,
+ G_STRUCT_OFFSET (GtkGLAreaClass, create_context),
+ create_context_accumulator, NULL,
+ _gtk_marshal_OBJECT__OBJECT,
+ GDK_TYPE_GL_CONTEXT, 1,
+ GDK_TYPE_GL_PIXEL_FORMAT);
+
+ /**
+ * GtkGLArea::render:
+ * @area: the #GtkGLArea that emitted the signal
+ * @context: the #GdkGLContext used by @area
+ *
+ * The ::render signal is emitted every time the contents
+ * of the #GtkGLArea should be redrawn.
+ *
+ * The @context is bound to the @area prior to emitting this function,
+ * and the buffers are flushed once the emission terminates.
+ *
+ * Returns: %TRUE to stop other handlers from being invoked for the event.
+ * %FALSE to propagate the event further.
+ *
+ * Since: 3.14
+ */
+ area_signals[RENDER] =
+ g_signal_new (I_("render"),
+ G_TYPE_FROM_CLASS (gobject_class),
+ G_SIGNAL_RUN_LAST,
+ G_STRUCT_OFFSET (GtkGLAreaClass, render),
+ _gtk_boolean_handled_accumulator, NULL,
+ NULL,
+ G_TYPE_BOOLEAN, 1,
+ GDK_TYPE_GL_CONTEXT);
+}
+
+static void
+gtk_gl_area_init (GtkGLArea *self)
+{
+ gtk_widget_set_has_window (GTK_WIDGET (self), TRUE);
+}
+
+/**
+ * gtk_gl_area_new:
+ * @pixel_format: a #GdkGLPixelFormat
+ *
+ * Creates a new #GtkGLArea widget using the given @pixel_format to
+ * configure a #GdkGLContext.
+ *
+ * Returns: (transfer full): the newly created #GtkGLArea
+ *
+ * Since: 3.14
+ */
+GtkWidget *
+gtk_gl_area_new (GdkGLPixelFormat *pixel_format)
+{
+ g_return_val_if_fail (GDK_IS_GL_PIXEL_FORMAT (pixel_format), NULL);
+
+ return g_object_new (GTK_TYPE_GL_AREA,
+ "pixel-format", pixel_format,
+ NULL);
+}
+
+/**
+ * gtk_gl_area_get_pixel_format:
+ * @area: a #GtkGLArea
+ *
+ * Retrieves the #GdkGLPixelFormat used by @area.
+ *
+ * Returns: (transfer none): the #GdkGLPixelFormat
+ *
+ * Since: 3.14
+ */
+GdkGLPixelFormat *
+gtk_gl_area_get_pixel_format (GtkGLArea *area)
+{
+ GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
+
+ g_return_val_if_fail (GTK_IS_GL_AREA (area), NULL);
+
+ return priv->pixel_format;
+}
+
+/**
+ * gtk_gl_area_get_context:
+ * @area: a #GtkGLArea
+ *
+ * Retrieves the #GdkGLContext used by @area.
+ *
+ * Returns: (transfer none): the #GdkGLContext
+ *
+ * Since: 3.14
+ */
+GdkGLContext *
+gtk_gl_area_get_context (GtkGLArea *area)
+{
+ GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
+
+ g_return_val_if_fail (GTK_IS_GL_AREA (area), NULL);
+
+ return priv->context;
+}
+
+/**
+ * gtk_gl_area_make_current:
+ * @area: a #GtkGLArea
+ *
+ * Ensures that the #GdkGLContext used by @area is associated with
+ * the #GtkGLArea.
+ *
+ * This function is automatically called before emitting the
+ * #GtkGLArea::draw-with-context signal, and should not be called
+ * by application code.
+ *
+ * Returns: %TRUE if the context was associated successfully with
+ * the widget
+ *
+ * Since: 3.14
+ */
+gboolean
+gtk_gl_area_make_current (GtkGLArea *area)
+{
+ GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
+ GtkWidget *widget;
+
+ g_return_val_if_fail (GTK_IS_GL_AREA (area), FALSE);
+
+ widget = GTK_WIDGET (area);
+ g_return_val_if_fail (gtk_widget_get_realized (widget), FALSE);
+
+ if (priv->context == NULL)
+ return FALSE;
+
+ gdk_gl_context_set_window (priv->context, gtk_widget_get_window (widget));
+
+ return gdk_gl_context_make_current (priv->context);
+}
+
+/**
+ * gtk_gl_area_flush_buffer:
+ * @area: a #GtkGLArea
+ *
+ * Flushes the buffer associated with @area.
+ *
+ * This function is automatically called after emitting
+ * the #GtkGLArea::draw-with-context signal, and should not
+ * be called by application code.
+ *
+ * Since: 3.14
+ */
+void
+gtk_gl_area_flush_buffer (GtkGLArea *area)
+{
+ GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
+
+ g_return_if_fail (GTK_IS_GL_AREA (area));
+ g_return_if_fail (gtk_widget_get_realized (GTK_WIDGET (area)));
+
+ if (priv->context == NULL)
+ return;
+
+ gdk_gl_context_flush_buffer (priv->context);
+}
diff --git a/gtk/gtkglarea.h b/gtk/gtkglarea.h
new file mode 100644
index 0000000..6f65366
--- /dev/null
+++ b/gtk/gtkglarea.h
@@ -0,0 +1,80 @@
+/* GTK - The GIMP Toolkit
+ *
+ * gtkglarea.h: A GL drawing area
+ *
+ * Copyright © 2014 Emmanuele Bassi
+ *
+ * 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 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GTK_GL_AREA_H__
+#define __GTK_GL_AREA_H__
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtkwidget.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_GL_AREA (gtk_gl_area_get_type ())
+#define GTK_GL_AREA(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_GL_AREA, GtkGLArea))
+#define GTK_IS_GL_AREA(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_GL_AREA))
+#define GTK_GL_AREA_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_GL_AREA, GtkGLAreaClass))
+#define GTK_IS_GL_AREA_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_GL_AREA))
+#define GTK_GL_AREA_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_GL_AREA, GtkGLAreaClass))
+
+typedef struct _GtkGLArea GtkGLArea;
+typedef struct _GtkGLAreaClass GtkGLAreaClass;
+
+struct _GtkGLArea
+{
+ /*< private >*/
+ GtkWidget parent_instance;
+};
+
+struct _GtkGLAreaClass
+{
+ /*< private >*/
+ GtkWidgetClass parent_class;
+
+ /*< public >*/
+ GdkGLContext * (* create_context) (GtkGLArea *area,
+ GdkGLPixelFormat *format);
+
+ gboolean (* render) (GtkGLArea *area,
+ GdkGLContext *context);
+
+ /*< private >*/
+ gpointer _padding[6];
+};
+
+GDK_AVAILABLE_IN_3_14
+GType gtk_gl_area_get_type (void) G_GNUC_CONST;
+
+GDK_AVAILABLE_IN_3_14
+GtkWidget * gtk_gl_area_new (GdkGLPixelFormat *format);
+
+GDK_AVAILABLE_IN_3_14
+GdkGLContext * gtk_gl_area_get_context (GtkGLArea *area);
+
+GDK_AVAILABLE_IN_3_14
+gboolean gtk_gl_area_make_current (GtkGLArea *area);
+GDK_AVAILABLE_IN_3_14
+void gtk_gl_area_flush_buffer (GtkGLArea *area);
+
+G_END_DECLS
+
+#endif /* __GTK_GL_AREA_H__ */
diff --git a/gtk/gtkmarshalers.list b/gtk/gtkmarshalers.list
index ab6983d..8fe9237 100644
--- a/gtk/gtkmarshalers.list
+++ b/gtk/gtkmarshalers.list
@@ -124,6 +124,7 @@ VOID:UINT,STRING,UINT
VOID:UINT,UINT
VOID:VOID
OBJECT:OBJECT,INT,INT
+OBJECT:OBJECT
VOID:POINTER,POINTER,POINTER,POINTER,STRING
VOID:OBJECT,STRING,POINTER,POINTER
INT:INT
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 0bc2cb0..861ee46 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -66,6 +66,7 @@ noinst_PROGRAMS = $(TEST_PROGS) \
testfullscreen \
testgeometry \
testgiconpixbuf \
+ testglarea \
testgrid \
testgtk \
testheaderbar \
diff --git a/tests/testglarea.c b/tests/testglarea.c
new file mode 100644
index 0000000..108dcdf
--- /dev/null
+++ b/tests/testglarea.c
@@ -0,0 +1,57 @@
+#include <stdlib.h>
+#include <gtk/gtk.h>
+
+#include <epoxy/gl.h>
+
+static gboolean
+render (GtkGLArea *area,
+ GdkGLContext *context)
+{
+ glClearColor (0, 0, 0, 0);
+ glClear (GL_COLOR_BUFFER_BIT);
+
+ glColor3f (1.0f, 0.85f, 0.35f);
+ glBegin (GL_TRIANGLES);
+ {
+ glVertex3f ( 0.0, 0.6, 0.0);
+ glVertex3f (-0.2, -0.3, 0.0);
+ glVertex3f ( 0.2, -0.3, 0.0);
+ }
+ glEnd ();
+
+ glFlush ();
+
+ return TRUE;
+}
+
+int
+main (int argc, char *argv[])
+{
+ GtkWidget *window, *gl_area;
+ GdkGLPixelFormat *pixel_format;
+
+ gtk_init (&argc, &argv);
+
+ /* create a new pixel format; we use this to configure the
+ * GL context, and to check for features
+ */
+ pixel_format = gdk_gl_pixel_format_new ("double-buffer", TRUE, NULL);
+
+ window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+ gtk_window_set_title (GTK_WINDOW (window), "GtkGLArea - Golden Triangle");
+ gtk_window_set_default_size (GTK_WINDOW (window), 400, 400);
+ gtk_container_set_border_width (GTK_CONTAINER (window), 12);
+ g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+ gtk_widget_show (window);
+
+ gl_area = gtk_gl_area_new (pixel_format);
+ gtk_container_add (GTK_CONTAINER (window), gl_area);
+ gtk_widget_show (gl_area);
+ g_object_unref (pixel_format);
+
+ g_signal_connect (gl_area, "render", G_CALLBACK (render), NULL);
+
+ gtk_main ();
+
+ return EXIT_SUCCESS;
+}
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