From 78b4918b207e16b967e8335fb8ec1b31c706c507 Mon Sep 17 00:00:00 2001
From: Sven Gothel
- * Sharing of server-side OpenGL objects such as buffer objects, e.g. VBOs,
- * and textures among OpenGL contexts is supported with this interface.
- *
- * A master {@link GLContext} is the {@link GLContext} which is created first.
- * Subsequent shared {@link GLContext} w/ the master are referred as slave {@link GLContext}.
- *
- * Implementations of this interface control the slave's {@link GLContext} and {@link GLAutoDrawable} realization,
- * i.e. the slave {@link GLAutoDrawable} will not be realized before their associated master.
- *
- * Using the nearest or same {@link GLCapabilitiesImmutable#getVisualID(com.jogamp.nativewindow.VisualIDHolder.VIDType) visual ID}
- * or {@link GLCapabilitiesImmutable caps} across the shared {@link GLDrawable}s will yield best compatibility.
- *
- * After shared objects are created on the master, the OpenGL pipeline
- * might need to be synchronized w/ the slaves, e.g. via {@link GL#glFinish()}.
- * At least this has been experienced w/ OSX 10.9.
- *
- * In general, destroying a master {@link GLContext} before their shared slaves
- * shall be permissible, i.e. the OpenGL driver needs to handle pending destruction of shared resources.
- * This is confirmed to work properly on most platform/driver combinations,
- * see unit test
- * However, to avoid scenarios with buggy drivers, users may not destroy the
- * master {@link GLContext} before its shared slave {@link GLContext} instances
- * as long as they are using them.
- * To simplify above lifecycle issues, one may use a {@link GLDrawableFactory#createDummyDrawable(com.jogamp.nativewindow.AbstractGraphicsDevice, boolean, GLCapabilitiesImmutable, GLCapabilitiesChooser) dummy}
- * {@link GLDrawable} and it's {@link GLContext} as the master of all shared slave {@link GLContext}.
- * Since this dummy instance does not depend on any native windowing system, it can be controlled easily w/o being in sight.Lifecycle Considerations
- * com.jogamp.opengl.test.junit.jogl.acore.TestSharedContextVBOES2NEWT3
and similar.
- *
- * Otherwise the OpenGL driver may crash w/ SIGSEGV, due to using already destroyed shared resources,
- * if not handling the pending destruction of the latter!
- * Either proper lifecycle synchronization is implemented, e.g. by notifying the slaves about the loss of the shared resources,
- * or the slaves validate whether the resources are still valid.
- *
- * Below code creates a {@link GLAutoDrawable} based on a dummy GLDrawable:
- *
- // GLProfile and GLCapabilities should be equal across all shared GL drawable/context.
- final GLCapabilitiesImmutable caps = ... ;
- final GLProfile glp = caps.getGLProfile();
- ..
- final boolean createNewDevice = true; // use 'own' display device!
- final GLAutoDrawable sharedDrawable = GLDrawableFactory.getFactory(glp).createDummyAutoDrawable(null, createNewDevice, caps, null);
- sharedDrawable.display(); // triggers GLContext object creation and native realization.
- ...
- // Later a shared 'slave' can be created e.g.:
- GLWindow glad = GLWindow.create(caps); // or any other GLAutoDrawable supporting GLSharedContextSetter
- glad.setSharedAutoDrawable(sharedDrawable);
- glad.addGLEventListener(..);
- glad.setVisible(true); // GLWindow creation ..
- *
- *
- * Usually synchronization of shared GL objects should not be required, if the shared GL objects - * are created and immutable before concurrent usage. - *
- *- * However, using drivers exposing {@link GLRendererQuirks#NeedSharedObjectSync} always - * require the user to synchronize access of shared GL objects. - *
- *- * Synchronization can be avoided if accessing the shared GL objects - * exclusively via a queue or {@link com.jogamp.common.util.Ringbuffer Ringbuffer}, see GLMediaPlayerImpl as an example. - *
- * - *- *
- * Error: 'intel_do_flush_locked: No such file or directory' - * JogAmp: https://jogamp.org/bugzilla/show_bug.cgi?id=873 - * freedesktop.org: https://bugs.freedesktop.org/show_bug.cgi?id=41736#c8 - *- * Shared context seems not to be supported w/ lock-free bound X11 display connections - * per OpenGL drawable/context. The error message above is thrown in this case. - * Hence the driver bug renders shared context use w/ JOGL impossible. - * - *
- * We failed to create a shared ES2 context on another thread. - *
- */ -public interface GLSharedContextSetter extends GLAutoDrawable { - /** - * Specifies an {@link GLContext OpenGL context}, which shall be shared by this {@link GLAutoDrawable}'s {@link GLContext}. - *- * Since the {@link GLDrawable drawable} and {@link GLContext context} is created - * at {@link GLAutoDrawable#initialization GLAutoDrawable initialization} - * this method shall be called beforehand to have any effect. - *
- *- * A set sharedContext will block context creation, i.e. {@link GLAutoDrawable#initialization GLAutoDrawable initialization}, - * as long it is not {@link GLContext#isCreated() created natively}. - *
- *- * The preferred method of assigning a shared context is - * to {@link #setSharedAutoDrawable(GLAutoDrawable) set the shared GLAutoDrawable}, - * since this method also takes the {@link GLEventListener} - * {@link GLAutoDrawable#areAllGLEventListenerInitialized() initialization into account}. - *
- *- * See Lifecycle Considerations. - *
- * - * @param sharedContext The OpenGL context to be shared by this {@link GLAutoDrawable}'s {@link GLContext}. - * @throws IllegalStateException if a {@link #setSharedContext(GLContext) shared GLContext} - * or {@link #setSharedAutoDrawable(GLAutoDrawable) shared GLAutoDrawable} is already set, - * the given sharedContext is null or equal to this {@link GLAutoDrawable}'s context. - * @see #setSharedAutoDrawable(GLAutoDrawable) - */ - void setSharedContext(GLContext sharedContext) throws IllegalStateException; - - /** - * Specifies an {@link GLAutoDrawable}, which {@link GLContext OpenGL context} shall be shared by this {@link GLAutoDrawable}'s {@link GLContext}. - *- * Since the {@link GLDrawable drawable} and {@link GLContext context} is created - * at {@link GLAutoDrawable#initialization GLAutoDrawable initialization} - * this method shall be called beforehand to have any effect. - *
- *- * A set sharedAutoDrawable will block context creation, i.e. initialization - * as long it's - *
null
, or- * See Lifecycle Considerations. - *
- * - * @param sharedContext The GLAutoDrawable, which OpenGL context shall be shared by this {@link GLAutoDrawable}'s {@link GLContext}. - * @throws IllegalStateException if a {@link #setSharedContext(GLContext) shared GLContext} - * or {@link #setSharedAutoDrawable(GLAutoDrawable) shared GLAutoDrawable} is already set, - * the given sharedAutoDrawable is null or equal to this GLAutoDrawable. - * @see #setSharedContext(GLContext) - */ - void setSharedAutoDrawable(GLAutoDrawable sharedAutoDrawable) throws IllegalStateException; -} -- cgit v1.2.3