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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}.
* </p>
* <h5><a name="driverstabilityconstraints">Driver stability constraints</a></h5>
* <p>
* Be aware that the <i>master</i> {@link GLContext} and related resources, i.e. the {@link GLAutoDrawable},
* <i>shall not</i> be destroyed before it's <i>slave</i> {@link GLContext} instances.<br>
* Otherwise the OpenGL driver implementation may crash w/ SIGSEGV if shared resources are still used!<br>
* Note that this is not specified within OpenGL and <i>should work</i>, however, some drivers
* do not seem to handle this situation well, i.e. they do not postpone resource destruction
* until the last reference is removed.<br>
* Since pending destruction of {@link GLContext} and it's {@link GLDrawable} is complex and nearly impossible
* for us at the top level, considering the different windowing systems and {@link GLAutoDrawable} types,
* the user shall take care of proper destruction order.
* </p>
* <p>
* Users may use a {@link GLDrawableFactory#createDummyDrawable(javax.media.nativewindow.AbstractGraphicsDevice, boolean, GLProfile) dummy}
* {@link GLDrawable} and it's {@link GLContext} as the <i>master</i> of all shared <i>slave</i> {@link GLContext}.
* Same constraints as above apply, i.e. it shall be destroyed <i>after</i> all shared slaves.
* </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="#driverstabilityconstraints">driver stability constraints</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="#driverstabilityconstraints">driver stability constraints</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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