1 files changed, 102 insertions, 0 deletions
diff --git a/gl4java/drawable/GLEventListener.java b/gl4java/drawable/GLEventListener.java
new file mode 100644
index 0000000..feb388d
--- /dev/null
+++ b/gl4java/drawable/GLEventListener.java
@@ -0,0 +1,102 @@
+package gl4java.drawable;
+
+import gl4java.GLEnum;
+import gl4java.GLUEnum;
+
+/** Declares events which client code can handle to perform OpenGL
+    rendering into a GLDrawable without subclassing. */
+
+public interface GLEventListener
+	extends java.util.EventListener, GLEnum, GLUEnum
+{
+  /** Called by the drawable immediately after the OpenGL context is
+      initialized; the GLContext has already been made current when
+      this method is called. Can be used to perform one-time OpenGL
+      initialization such as setup of lights and display lists.
+
+      @see gl4java.awt.GLCanvas#init
+      @see gl4java.swing.GLJPanel#init
+  */
+  public void init(GLDrawable drawable);
+
+  /** Called by the drawable before initiate rendering by the client. At
+      the time this method is called, the duration for this frames
+      time consume is started.
+      After all GLEventListeners have been notified of a preDisplay event, 
+      the drawable will continues with the
+      {@link gl4java.drawable.GLEventListener#display} event.
+
+      @see gl4java.awt.GLAnimCanvas#display
+      @see gl4java.awt.GLCanvas#display
+      @see gl4java.swing.GLJPanel#display
+      @see gl4java.drawable.GLEventListener#display
+      @see gl4java.drawable.GLEventListener#postDisplay
+  */
+  public void preDisplay(GLDrawable drawable);
+
+  /** Called by the drawable to initiate rendering by the client. At
+      the time this method is called, the drawable has already called
+      {@link gl4java.drawable.GLEventListener#preDisplay} and made
+      its associated GLContext current by a call to {@link
+      gl4java.GLContext#gljMakeCurrent}. After all GLEventListeners
+      have been notified of a display event, the drawable will swap
+      its buffers if necessary and then free its GLContext with a call
+      to {@link gl4java.GLContext#gljFree} and
+      and continues with the 
+      {@link gl4java.drawable.GLEventListener#postDisplay} event.
+      So the GLContext is locked while the GLEventListeners
+      receives this display event.
+
+      @see gl4java.awt.GLAnimCanvas#display
+      @see gl4java.awt.GLCanvas#display
+      @see gl4java.swing.GLJPanel#display
+      @see gl4java.drawable.GLEventListener#preDisplay
+      @see gl4java.drawable.GLEventListener#postDisplay
+  */
+  public void display(GLDrawable drawable);
+
+  /** Called by the drawable after initiate rendering by the client. At
+      the time this method is called, the drawable has already called
+      {@link gl4java.drawable.GLEventListener#display}.
+      After all GLEventListeners
+      have been notified of a postDisplay event, the 
+      duration for the consumed time is stopped.
+
+      @see gl4java.awt.GLAnimCanvas#display
+      @see gl4java.awt.GLCanvas#display
+      @see gl4java.swing.GLJPanel#display
+      @see gl4java.drawable.GLEventListener#preDisplay
+      @see gl4java.drawable.GLEventListener#display
+      @see gl4java.drawable.GLEventListener#postDisplay
+  */
+  public void postDisplay(GLDrawable drawable);
+
+  /** Called by the drawable if it wants to destroy itself.
+      Here you can clean up any OpenGL stuff (delete textures
+      or whatever) prior to actually deleting the OpenGL context.
+
+      @see gl4java.awt.GLCanvas#doCleanup
+      @see gl4java.swing.GLJPanel#doCleanup
+  */
+  public void cleanup(GLDrawable drawable);
+
+  /** Called by the drawable during the first repaint after the
+      component has been resized. The client can update the viewport
+      and view volume of the window appropriately, for example by a
+      call to {@link gl4java.GLFunc#glViewport}; note that for
+      convenience the component has already called {@link
+      gl4java.GLContext#gljResize}(width, height) and {@link
+      gl4java.GLFunc.glViewport}(0, 0, width, height) when this method
+      is called, so the client may not have to do anything in this
+      method. At the time this method is called, the drawable has
+      already made its associated GLContext current by a call to
+      {@link gl4java.GLContext#gljMakeCurrent}. After all
+      GLEventListeners have been notified of a reshape event, the
+      drawable will free its GLContext with a call to {@link
+      gl4java.GLContext#gljFree}.
+
+      @see gl4java.awt.GLCanvas#reshape
+      @see gl4java.swing.GLJPanel#reshape
+ */
+  public void reshape(GLDrawable drawable, int width, int height);
+}