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/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package javax.media.opengl;
// FIXME: We need some way to tell when the device upon which the canvas is
// being displayed has changed (e.g., the user drags the canvas's parent
// window from one screen on multi-screen environment to another, when the
// user changes the display bit depth or screen resolution, etc). When this
// occurs, we need the canvas to reset the gl function pointer tables for the
// canvas, because the new device may have different capabilities (e.g.,
// doesn't support as many opengl extensions) from the original device. This
// hook would also be useful in other GLDrawables (for example, offscreen
// buffers such as pbuffers, whose contents may or may not be invalidated when
// the display mode changes, depending on the vendor's GL implementation).
//
// Right now I'm not sure how hook into when this change occurs. There isn't
// any AWT event corresponding to a device change (as far as I can
// tell). We could constantly check the GraphicsConfiguration of the canvas's top-level
// parent to see if it has changed, but this would be very slow (we'd have to
// do it every time the context is made current). There has got to be a better
// solution, but I'm not sure what it is.
// FIXME: Subclasses need to call resetGLFunctionAvailability() on their
// context whenever the displayChanged() function is called on our
// GLEventListeners
/** An abstraction for an OpenGL rendering target. A GLDrawable's
primary functionality is to create OpenGL contexts which can be
used to perform rendering. A GLDrawable does not automatically
create an OpenGL context, but all implementations of {@link
GLAutoDrawable} do so upon creation. */
public interface GLDrawable {
/**
* Creates a new context for drawing to this drawable that will
* optionally share display lists and other server-side OpenGL
* objects with the specified GLContext. <P>
*
* The GLContext <code>share</code> 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 on
* <a href="../../../overview-summary.html#SHARING">context sharing</a>.
*/
public GLContext createContext(GLContext shareWith);
/**
* Indicates to on-screen GLDrawable implementations whether the
* underlying window has been created and can be drawn into. This
* method must be called from GLDrawables obtained from the
* GLDrawableFactory via the {@link GLDrawableFactory#getGLDrawable
* GLDrawableFactory.getGLDrawable()} method. It must typically be
* called with an argument of <code>true</code> in the
* <code>addNotify</code> method of components performing OpenGL
* rendering and with an argument of <code>false</code> in the
* <code>removeNotify</code> method. Calling this method has no
* other effects. For example, if <code>removeNotify</code> 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. It is not necessary to call
* <code>setRealized</code> on a GLCanvas, a GLJPanel, or a
* GLPbuffer, as these perform the appropriate calls on their
* underlying GLDrawables internally..
*/
public void setRealized(boolean realized);
/** Requests a new width and height for this GLDrawable. Not all
drawables are able to respond to this request and may silently
ignore it. */
public void setSize(int width, int height);
/** Returns the current width of this GLDrawable. */
public int getWidth();
/** Returns the current height of this GLDrawable. */
public int getHeight();
/** Swaps the front and back buffers of this drawable. For {@link
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. */
public void swapBuffers() throws GLException;
}
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