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/**
* Copyright 2013 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions 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.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package javax.media.opengl;
/**
* Adds capabilities to set a shared {@link GLContext} directly or via an {@link GLAutoDrawable}.
* <p>
* Sharing of server-side OpenGL objects such as buffer objects, e.g. VBOs,
* and textures among OpenGL contexts is supported with this interface.
* </p>
* <p>
* A <i>master</i> {@link GLContext} is the {@link GLContext} which is created first,
* shared {@link GLContext} w/ this master are referred as slave {@link GLContext}
* and controls the shared object's lifecycle, i.e. their construction and destruction.
* </p>
* <p>
* Using the nearest or same {@link GLCapabilitiesImmutable#getVisualID(javax.media.nativewindow.VisualIDHolder.VIDType) visual ID}
* or {@link GLCapabilitiesImmutable caps} across the shared {@link GLDrawable}s will yield best compatibility.
* </p>
* <h5><a name="lifecycle">Lifecycle Considerations</a></h5>
* <p>
* After shared objects are created on the <i>master</i>, the OpenGL pipeline
* might need to be synchronized w/ the <i>slaves</i>, e.g. via {@link GL#glFinish()}.
* At least this has been experienced w/ OSX 10.9.
* </p>
* <p>
* Be aware that the <i>master</i> {@link GLContext} and related resources
* <i>shall not</i> be destroyed before it's <i>slave</i> {@link GLContext} instances <i>while they are using them</i>.<br>
* Otherwise the OpenGL driver implementation may crash w/ SIGSEGV, since using already destroyed resources,
* e.g. OpenGL buffer objects, may not be validated by the driver!<br>
* </p>
* <p>
* Either proper lifecycle synchronization is implemented, e.g. by notifying the <i>slaves</i> about the loss of the shared resources,
* <i>or</i> the <i>slaves</i> validate whether the resources are still valid.
* </p>
* <p>
* To simplify above lifecycle issues, one may use a {@link GLDrawableFactory#createDummyDrawable(javax.media.nativewindow.AbstractGraphicsDevice, boolean, GLCapabilitiesImmutable, GLCapabilitiesChooser) dummy}
* {@link GLDrawable} and it's {@link GLContext} as the <i>master</i> of all shared <i>slave</i> {@link GLContext}.
* Since this <i>dummy instance</i> does not depend on any native windowing system, it can be controlled easily w/o being <i>in sight</i>.<br>
* Below code creates a {@link GLAutoDrawable} based on a <i>dummy GLDrawable</i>:
* <pre>
// 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 ..
* </pre>
* </p>
* <h5><a name="driverissues">Known Driver Issues</a></h5>
* <h7><a name="intelmesa">Intel's Mesa >= 9.1.2 Backend for [Sandybridge/Ivybridge] on GNU/Linux</a></h7>
* <p>
* <pre>
* 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
* </pre>
* 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.
* </p>
* <h7><a name="hisilicon">Hisilicon's Immersion.16 on Android</a></h7>
* <p>
* We failed to create a shared ES2 context on another thread.
* </p>
*/
public interface GLSharedContextSetter extends GLAutoDrawable {
/**
* Specifies an {@link GLContext OpenGL context}, which shall be shared by this {@link GLAutoDrawable}'s {@link GLContext}.
* <p>
* 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.
* </p>
* <p>
* A set <i>sharedContext</i> will block context creation, i.e. {@link GLAutoDrawable#initialization GLAutoDrawable initialization},
* as long it is not {@link GLContext#isCreated() created natively}.
* </p>
* <p>
* See <a href="#lifecycle">Lifecycle Considerations</a>.
* </p>
*
* @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}.
* <p>
* 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.
* </p>
* <p>
* A set <i>sharedAutoDrawable</i> will block context creation, i.e. {@link GLAutoDrawable#initialization GLAutoDrawable initialization},
* as long it's {@link GLContext} is <code>null</code>
* or has not been {@link GLContext#isCreated() created natively}.
* </p>
* <p>
* See <a href="#lifecycle">Lifecycle Considerations</a>.
* </p>
*
* @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;
}
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