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Diffstat (limited to 'src/jogl/classes/com/jogamp/opengl/GLSharedContextSetter.java')
| -rw-r--r-- | src/jogl/classes/com/jogamp/opengl/GLSharedContextSetter.java | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/src/jogl/classes/com/jogamp/opengl/GLSharedContextSetter.java b/src/jogl/classes/com/jogamp/opengl/GLSharedContextSetter.java new file mode 100644 index 000000000..852ebcaa7 --- /dev/null +++ b/src/jogl/classes/com/jogamp/opengl/GLSharedContextSetter.java @@ -0,0 +1,181 @@ +/** + * 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 com.jogamp.opengl; + +import com.jogamp.opengl.GLRendererQuirks; + +/** + * 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. + * Subsequent shared {@link GLContext} w/ the <i>master</i> are referred as <i>slave</i> {@link GLContext}. + * </p> + * <p> + * Implementations of this interface control the <i>slave's</i> {@link GLContext} and {@link GLAutoDrawable} realization, + * i.e. the <i>slave</i> {@link GLAutoDrawable} will not be realized before their associated <i>master</i>. + * </p> + * <p> + * 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. + * </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> + * In general, destroying a <i>master</i> {@link GLContext} before their shared <i>slaves</i> + * 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 <code>com.jogamp.opengl.test.junit.jogl.acore.TestSharedContextVBOES2NEWT3</code> and similar. + * </p> + * <p> + * However, to avoid scenarios with buggy drivers, users <i>may not</i> destroy the + * <i>master</i> {@link GLContext} before its shared <i>slave</i> {@link GLContext} instances + * <i>as long as they are using them</i>.<br> + * Otherwise the OpenGL driver may crash w/ SIGSEGV, due to using already destroyed shared resources, + * if not handling the pending destruction of the latter!<br> + * 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(com.jogamp.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="synchronization">GL Object Synchronization</a></h5> + * <p> + * Usually synchronization of shared GL objects should not be required, if the shared GL objects + * are created and immutable before concurrent usage. + * </p> + * <p> + * However, using drivers exposing {@link GLRendererQuirks#NeedSharedObjectSync} always + * require the user to synchronize access of shared GL objects. + * </p> + * <p> + * 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. + * </p> + * </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> + * The <i>preferred method</i> of assigning a <i>shared context</i> is + * to {@link #setSharedAutoDrawable(GLAutoDrawable) set the shared GLAutoDrawable}, + * since this method also takes the {@link GLEventListener} + * {@link GLAutoDrawable#areAllGLEventListenerInitialized() initialization into account}. + * </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. <a href="GLAutoDrawable.html#initialization">initialization</a> + * as long it's + * <ul> + * <li>{@link GLContext} is <code>null</code>, or</li> + * <li>{@link GLContext} has not been {@link GLContext#isCreated() created natively}, or</li> + * <li>{@link GLEventListener} are <i>not</i> {@link GLAutoDrawable#areAllGLEventListenerInitialized() completely initialized}</li> + * </ul> + * </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; +} |