Interface GLDrawable

    • Method Detail

      • createContext

        GLContext createContext​(GLContext shareWith)
        Creates a new context for drawing to this drawable that will optionally share buffer objects, textures and other server-side OpenGL objects with the specified GLContext.

        The GLContext share need not be associated with this GLDrawable and may be null if sharing of display lists and other objects is not desired. See the note in the overview documentation context sharing as well as GLSharedContextSetter.

      • setRealized

        void setRealized​(boolean realized)
        Indicates to GLDrawable implementations whether the underlying surface has been created and can be drawn into.

        If realized, the drawable handle may become valid while it's surface is being locked.

        End users do not need to call this method; it is not necessary to call setRealized on a GLAutoDrawable as these perform the appropriate calls on their underlying GLDrawables internally.

        Developers implementing new OpenGL components for various window toolkits need to call this method against GLDrawables obtained from the GLDrawableFactory via the GLDrawableFactory.createGLDrawable(NativeSurface) method. It must typically be called with an argument of true when the component associated with the GLDrawable is realized and with an argument of false just before the component is unrealized. For the AWT, this means calling setRealized(true) in the addNotify method and with an argument of false in the removeNotify method.

        GLDrawable implementations should handle multiple cycles of setRealized(true) / setRealized(false) calls. Most, if not all, Java window toolkits have a persistent object associated with a given component, regardless of whether that component is currently realized. The GLDrawable object associated with a particular component is intended to be similarly persistent. A GLDrawable is intended to be created for a given component when it is constructed and live as long as that component. setRealized allows the GLDrawable to re-initialize and destroy any associated resources as the component becomes realized and unrealized, respectively.

        With an argument of true, the minimum implementation shall call NativeSurface's lockSurface() and if successful:

        This is important since NativeSurface's lockSurface() ensures resolving the window/surface handles, and the drawable's GLCapabilities might have changed.

        Calling this method has no other effects. For example, if removeNotify is called on a Canvas implementation for which a GLDrawable has been created, it is also necessary to destroy all OpenGL contexts associated with that GLDrawable. This is not done automatically by the implementation.

        See Also:
        isRealized(), getHandle(), NativeSurface.lockSurface()
      • isGLOriented

        boolean isGLOriented()
        Returns true if the drawable is rendered in OpenGL's coordinate system, origin at bottom left. Otherwise returns false, i.e. origin at top left.

        Default impl. is true, i.e. OpenGL coordinate system.

        Currently only MS-Windows bitmap offscreen drawable uses a non OpenGL orientation and hence returns false.
        This removes the need of a vertical flip when used in AWT or Windows applications.

      • swapBuffers

        void swapBuffers()
                  throws GLException
        Swaps the front and back buffers of this drawable. For GLAutoDrawable implementations, when automatic buffer swapping is enabled (as is the default), this method is called automatically and should not be called by the end user.
      • getChosenGLCapabilities

        GLCapabilitiesImmutable getChosenGLCapabilities()
        Fetches the GLCapabilitiesImmutable corresponding to the chosen OpenGL capabilities (pixel format / visual / GLProfile) for this drawable.

        This query only returns the chosen capabilities if isRealized().

        On some platforms, the pixel format is not directly associated with the drawable; a best attempt is made to return a reasonable value in this case.

        This object shall be directly associated to the attached NativeSurface's AbstractGraphicsConfiguration, and if changes are necessary, they should reflect those as well.

        The immutable queried instance.
        See Also:
      • getGLProfile

        GLProfile getGLProfile()
        Fetches the GLProfile for this drawable. Returns the GLProfile object, no copy.