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This widget is derived from Gtk_Drawing_Area and provides an area where it is possible to use the openGL API.
Widget Hierarchy |
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GObject (see Package_Glib.Object) Gtk_Object (see Package_Gtk.Object) \___ Gtk_Widget (see Package_Gtk.Widget) \___ Gtk_Drawing_Area (see Package_Gtk.Drawing_Area) \___ Gtk_GLArea (see Package_Gtk.GLArea) |
Types |
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Note: as opposed to what exists in C, you don't need to have
the last element in the array be GDK_GL_NONE. This is done
transparently by GtkAda itself.
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Subprograms |
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procedure Gtk_New (Widget : out Gtk_GLArea; Attr_List : in Attributes_Array); |
Make an OpenGL widget, Attr_List is passed to glXChooseVisual GLX call. Attr_List specifies a list of Boolean attributes and enum/integer attribute/value pairs. See glXChooseVisual man page for more explanation on Attr_List. Widget is created with visual and colormap of the requested type and GLX context is created for this widget. You can't do opengl calls on widget until it has X window. X window is not created until widget is realized. |
procedure Gtk_New (Widget : out Gtk_GLArea; Attr_List : in Attributes_Array; Share : access Gtk_GLArea_Record'Class); |
Same as above. Share specifies the widget with which to share display lists and texture objects. A non initialized value indicates that no sharing is to take place. |
function Make_Current (Glarea : access Gtk_GLArea_Record'Class) return Boolean; |
Must be called before rendering into OpenGL widgets. Return True if rendering to widget is possible. Rendering is not possible if widget is not Gtk_GLArea widget or widget is not realized. |
procedure Swap_Buffers (Glarea : access Gtk_GLArea_Record'Class); |
Promote contents of back buffer of Glarea to front buffer. The contents of front buffer become undefined. |