/*
 * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
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 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
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 * - 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.
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 * 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
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 * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
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 * You acknowledge that this software is not designed or intended for use
 * in the design, construction, operation or maintenance of any nuclear
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 * 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.
   *
   * 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.
   */
  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;
}