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public interface GLAutoDrawable
A higher-level abstraction than GLDrawable which supplies
an event based mechanism (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 synchronized property enabled so that
calls to 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.
The implementation shall initialize itself as soon as possible,
ie if the attached NativeSurface becomes visible/realized.
The following protocol shall be satisfied:
GLDrawable with the requested GLCapabilitiesGLDrawable to validate the GLCapabilities by calling setRealized(true).GLContext.init(..) for all
registered GLEventListeners. This can be done immediatly, or with the followup display(..) call.reshape(..) for all
registered GLEventListeners. This shall be done after the init(..) calls.
Another implementation detail is the drawable reconfiguration. One use case is where a window is being
dragged to another screen with a different pixel configuration, ie GLCapabilities. The implementation
shall be able to detect such cases in conjunction with the associated NativeSurface.
For example, AWT's Canvas 's getGraphicsConfiguration()
is capable to determine a display device change. This is demonstrated within GLCanvas's
and NEWT's AWTCanvas getGraphicsConfiguration()
specialization. Another demonstration is NEWT's NativeWindow
implementation on the Windows platform, which utilizes the native platform's MonitorFromWindow(HWND) function.
All OpenGL resources shall be regenerated, while the drawable's GLCapabilities has
to be choosen again. The following protocol shall be satisfied.
dispose(..) for all
registered GLEventListeners.GLContext.GLDrawable of the invalid state by calling setRealized(false).GLDrawable with the requested GLCapabilities
GLDrawable to revalidate the GLCapabilities by calling setRealized(true).GLContext.init(..) for all
registered GLEventListeners. This can be done immediatly, or with the followup display(..) call.reshape(..) for all
registered GLEventListeners. This shall be done after the init(..) calls.
However, to not introduce to much breakage with older applications and because of the situation
mentioned above, the boolean system property jogl.screenchange.action will control the
screen change action as follows:
-Djogl.screenchange.action=false Disable the drawable reconfiguration (the default)
-Djogl.screenchange.action=true Enable the drawable reconfiguration
| Field Summary | |
|---|---|
static boolean |
SCREEN_CHANGE_ACTION_ENABLED
Flag reflecting wheather the drawable reconfiguration will be issued in case a screen device change occured, e.g. |
| Method Summary | |
|---|---|
void |
addGLEventListener(GLEventListener listener)
Adds a GLEventListener to the end of this drawable queue. |
void |
addGLEventListener(int index,
GLEventListener listener)
Adds a GLEventListener at the given index of this drawable queue. |
void |
destroy()
Destroys all resources associated with this GLAutoDrawable, inclusive the GLContext. |
void |
display()
Causes OpenGL rendering to be performed for this GLAutoDrawable in the following order: Calling display(..) for all
registered GLEventListeners. |
GLAnimatorControl |
getAnimator()
|
boolean |
getAutoSwapBufferMode()
Indicates whether automatic buffer swapping is enabled for this drawable. |
GLContext |
getContext()
Returns the context associated with this drawable. |
int |
getContextCreationFlags()
|
GL |
getGL()
Returns the GL pipeline object this GLAutoDrawable uses. |
void |
invoke(boolean wait,
GLRunnable glRunnable)
Enqueues a one-shot GLRunnable,
which will be executed with the next display() call. |
void |
removeGLEventListener(GLEventListener listener)
Removes a GLEventListener from this drawable. |
void |
setAnimator(GLAnimatorControl animatorControl)
Registers the usage of an animator, an GLAnimatorControl implementation. |
void |
setAutoSwapBufferMode(boolean enable)
Enables or disables automatic buffer swapping for this drawable. |
void |
setContext(GLContext context)
Associate a new context to this drawable. |
void |
setContextCreationFlags(int flags)
|
GL |
setGL(GL gl)
Sets the GL pipeline object this GLAutoDrawable uses. |
| Methods inherited from interface javax.media.opengl.GLDrawable |
|---|
createContext, getChosenGLCapabilities, getFactory, getGLProfile, getHandle, getHeight, getNativeSurface, getWidth, isRealized, setRealized, swapBuffers, toString |
| Field Detail |
|---|
static final boolean SCREEN_CHANGE_ACTION_ENABLED
| Method Detail |
|---|
GLContext getContext()
void setContext(GLContext context)
void addGLEventListener(GLEventListener listener)
GLEventListener to the end of this drawable queue.
The listeners are notified of events in the order of the queue.
void addGLEventListener(int index,
GLEventListener listener)
throws IndexOutOfBoundsException
GLEventListener at the given index of this drawable queue.
The listeners are notified of events in the order of the queue.
index - Position where the listener will be inserted.
Should be within (0 <= index && index <= size()).
An index value of -1 is interpreted as the end of the list, size().listener - The GLEventListener object to be inserted
IndexOutOfBoundsException - If the index is not within (0 <= index && index <= size()), or -1void removeGLEventListener(GLEventListener listener)
GLEventListener from this drawable. Note that
if this is done from within a particular drawable's GLEventListener handler (reshape, display, etc.) that it is not
guaranteed that all other listeners will be evaluated properly
during this update cycle.
void setAnimator(GLAnimatorControl animatorControl)
throws GLException
Registers the usage of an animator, an GLAnimatorControl implementation.
The animator will be queried whether it's animating, ie periodically issuing display() calls or not.
This method shall be called by an animator implementation only,
e.g. AnimatorBase.add(javax.media.opengl.GLAutoDrawable), passing it's control implementation,
and AnimatorBase.remove(javax.media.opengl.GLAutoDrawable), passing null.
Impacts display() and invoke(boolean, GLRunnable) semantics.
animator - null reference indicates no animator is using
this GLAutoDrawable,GLAutoDrawable.
GLException - if an animator is already registered.display(),
invoke(boolean, GLRunnable),
GLAnimatorControlGLAnimatorControl getAnimator()
GLAnimatorControl implementation, using this GLAutoDrawable.setAnimator(javax.media.opengl.GLAnimatorControl),
GLAnimatorControl
void invoke(boolean wait,
GLRunnable glRunnable)
Enqueues a one-shot GLRunnable,
which will be executed with the next display() call.
If no GLAnimatorControl is animating (default),
or if the current thread is the animator thread,
a display() call is issued after enqueue the GLRunnable.
No extra synchronization is performed in case wait is true, since it is executed in the current thread.
If an GLAnimatorControl is animating,
no display() call is issued, since the animator thread performs it.
If wait is true, the implementation waits until the GLRunnable is executed.
setAnimator(javax.media.opengl.GLAnimatorControl),
display(),
GLRunnablevoid destroy()
dispose(..) for all
registered GLEventListeners. Called automatically by the
window system toolkit upon receiving a destroy notification. This
routine may be called manually.
void display()
Causes OpenGL rendering to be performed for this GLAutoDrawable in the following order:
display(..) for all
registered GLEventListeners. GLRunnable,
enqueued via invoke(boolean, GLRunnable).
May be called periodically by a running GLAnimatorControl implementation,
which must register itself with setAnimator(javax.media.opengl.GLAnimatorControl).
Called automatically by the window system toolkit upon receiving a repaint() request,
except an GLAnimatorControl implementation GLAnimatorControl.isAnimating().
This routine may also be called manually for better control over the
rendering process. It is legal to call another GLAutoDrawable's
display method from within the display(..) callback.
In case of a new generated OpenGL context,
the implementation shall call init(..) for all
registered GLEventListeners before making the
actual display(..) calls,
in case this has not been done yet.
setAnimator(javax.media.opengl.GLAnimatorControl)void setAutoSwapBufferMode(boolean enable)
GLDrawable.swapBuffers(..) manually.
boolean getAutoSwapBufferMode()
setAutoSwapBufferMode(boolean).
void setContextCreationFlags(int flags)
flags - Additional context creation flags.GLContext.setContextCreationFlags(int),
GLContext.enableGLDebugMessage(boolean)int getContextCreationFlags()
GL getGL()
GL pipeline object this GLAutoDrawable uses.
If this method is called outside of the 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.
GL setGL(GL gl)
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.
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