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 * This software is provided "AS IS," without a warranty of any kind. ALL
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package net.java.games.jogl;

/** A higher-level abstraction than {@link GLDrawable} which supplies
    an event based mechanism ({@link GLEventListener}) for performing
    OpenGL rendering. A GLAutoDrawable automatically creates a primary
    rendering context which is associated with the GLAutoDrawable for
    the lifetime of the object. This context has the {@link
    GLContext#setSynchronized synchronized} property enabled so that
    calls to {@link GLContext#makeCurrent makeCurrent} will block if
    the context is current on another thread. This allows the internal
    GLContext for the GLAutoDrawable to be used both by the event
    based rendering mechanism as well by end users directly. */

public interface GLAutoDrawable extends GLDrawable, ComponentEvents {
  /**
   * Returns the context associated with this drawable. The returned
   * context will be synchronized.
   */
  public GLContext getContext();

  /** Adds a {@link GLEventListener} to this drawable. If multiple
      listeners are added to a given drawable, they are notified of
      events in an arbitrary order. */
  public void addGLEventListener(GLEventListener listener);

  /** Removes a {@link GLEventListener} from this drawable. Note that
      if this is done from within a particular drawable's {@link
      GLEventListener} handler (reshape, display, etc.) that it is not
      guaranteed that all other listeners will be evaluated properly
      during this update cycle. */
  public void removeGLEventListener(GLEventListener listener);

  /** Causes OpenGL rendering to be performed for this GLAutoDrawable
      by calling {@link GLEventListener#display display} for all
      registered {@link GLEventListener}s. Called automatically by the
      window system toolkit upon receiving a repaint() request. this
      routine may be called manually for better control over the
      rendering process. It is legal to call another GLAutoDrawable's
      display method from within the {@link GLEventListener#display
      display} callback. */
  public void display();

  /** Enables or disables automatic buffer swapping for this drawable.
      By default this property is set to true; when true, after all
      GLEventListeners have been called for a display() event, the
      front and back buffers are swapped, displaying the results of
      the render. When disabled, the user is responsible for calling
      {@link #swapBuffers} manually. */
  public void setAutoSwapBufferMode(boolean onOrOff);

  /** Indicates whether automatic buffer swapping is enabled for this
      drawable. See {@link #setAutoSwapBufferMode}. */
  public boolean getAutoSwapBufferMode();

  /** Returns the {@link GL} pipeline object this GLAutoDrawable uses.
      If this method is called outside of the {@link
      GLEventListener}'s callback methods (init, display, etc.) it may
      return null. Users should not rely on the identity of the
      returned GL object; for example, users should not maintain a
      hash table with the GL object as the key. Additionally, the GL
      object should not be cached in client code, but should be
      re-fetched from the GLAutoDrawable at the beginning of each call
      to init, display, etc. */
  public GL getGL();

  /** Sets the {@link GL} pipeline object this GLAutoDrawable uses.
      This should only be called from within the GLEventListener's
      callback methods, and usually only from within the init()
      method, in order to install a composable pipeline. See the JOGL
      demos for examples. */
  public void setGL(GL gl);

  /** Returns the {@link GLU} pipeline object this GLAutoDrawable
      uses. */
  public GLU getGLU();

  /** Sets the {@link GLU} pipeline object this GLAutoDrawable
      uses. */
  public void setGLU(GLU glu);
}