OpenGL-Capable Widget

OpenGL-Capable Widget — OpenGL extension to GtkWidget API

Synopsis


#include <gtk/gtkgl.h>


gboolean    gtk_widget_set_gl_capability    (GtkWidget *widget,
                                             GdkGLConfig *glconfig,
                                             GdkGLContext *share_list,
                                             gboolean direct,
                                             int render_type);
gboolean    gtk_widget_is_gl_capable        (GtkWidget *widget);
GdkGLConfig* gtk_widget_get_gl_config       (GtkWidget *widget);
GdkGLContext* gtk_widget_create_gl_context  (GtkWidget *widget,
                                             GdkGLContext *share_list,
                                             gboolean direct,
                                             int render_type);
GdkGLContext* gtk_widget_get_gl_context     (GtkWidget *widget);
GdkGLWindow* gtk_widget_get_gl_window       (GtkWidget *widget);
#define     gtk_widget_get_gl_drawable      (widget)

Description

GtkGLExt is an extension to GTK which adds OpenGL capabilities to GtkWidget. Its use is quite simple: use gtk_widget_set_gl_capability to add OpenGL support to a widget, it will create a OpenGL drawable (GdkGLDrawable) for the widget, which can be obtained via gtk_widget_get_gl_drawable. OpenGL rendering context (GdkGLContext) can also be obtained via gtk_widget_get_gl_context. With GdkGLDrawable and GdkGLContext, gdk_gl_drawable_gl_begin and gdk_gl_drawable_gl_end can be called, and OpenGL function calls can be made between those two functions.

Details

gtk_widget_set_gl_capability ()

gboolean    gtk_widget_set_gl_capability    (GtkWidget *widget,
                                             GdkGLConfig *glconfig,
                                             GdkGLContext *share_list,
                                             gboolean direct,
                                             int render_type);

Set the OpenGL-capability to the widget. This function prepares the widget for its use with OpenGL.

`widget` :	the GtkWidget to be used as the rendering area.
`glconfig` :	a GdkGLConfig.
`share_list` :	the GdkGLContext with which to share display lists and texture objects. NULL indicates that no sharing is to take place.
`direct` :	whether rendering is to be done with a direct connection to the graphics system.
`render_type` :	GDK_GL_RGBA_TYPE or GDK_GL_COLOR_INDEX_TYPE (currently not used).
Returns :	TRUE if it is successful, FALSE otherwise.

gtk_widget_is_gl_capable ()

gboolean    gtk_widget_is_gl_capable        (GtkWidget *widget);

Returns whether the widget is OpenGL-capable.

`widget` :	a GtkWidget.
Returns :	TRUE if the `widget` is OpenGL-capable, FALSE otherwise.

gtk_widget_get_gl_config ()

GdkGLConfig* gtk_widget_get_gl_config       (GtkWidget *widget);

Returns the GdkGLConfig referred by the widget.

`widget` :	a GtkWidget.
Returns :	the GdkGLConfig.

gtk_widget_create_gl_context ()

GdkGLContext* gtk_widget_create_gl_context  (GtkWidget *widget,
                                             GdkGLContext *share_list,
                                             gboolean direct,
                                             int render_type);

Creates a new GdkGLContext with the appropriate GdkGLDrawable for this widget. The GL context must be freed when you're finished with it. See also gtk_widget_get_gl_context().

`widget` :	a GtkWidget.
`share_list` :	the GdkGLContext with which to share display lists and texture objects. NULL indicates that no sharing is to take place.
`direct` :	whether rendering is to be done with a direct connection to the graphics system.
`render_type` :	GDK_GL_RGBA_TYPE or GDK_GL_COLOR_INDEX_TYPE (currently not used).
Returns :	the new GdkGLContext.

gtk_widget_get_gl_context ()

GdkGLContext* gtk_widget_get_gl_context     (GtkWidget *widget);

Returns the GdkGLContext with the appropriate GdkGLDrawable for this widget. Unlike the GL context returned by gtk_widget_create_gl_context(), this context is owned by the widget.

GdkGLContext is needed for the function gdk_gl_drawable_begin, or for sharing display lists (see gtk_widget_set_gl_capability()).

`widget` :	a GtkWidget.
Returns :	the GdkGLContext.

gtk_widget_get_gl_window ()

GdkGLWindow* gtk_widget_get_gl_window       (GtkWidget *widget);

Returns the GdkGLWindow owned by the widget.

`widget` :	a GtkWidget.
Returns :	the GdkGLWindow.

gtk_widget_get_gl_drawable()

#define     gtk_widget_get_gl_drawable(widget)

Returns the GdkGLDrawable owned by the widget. In fact, this is macro that casts the result of gtk_widget_get_gl_window to GdkGLDrawable.

`widget` :	a GtkWidget.
Returns :	the GdkGLDrawable.