Show Context.java syntax highlighted
/*
* Copyright (c) 2002-2004 LWJGL Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of 'LWJGL' nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT OWNER 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.
*/
package org.lwjgl.d3d;
import java.nio.ByteBuffer;
import org.lwjgl.LWJGLException;
import org.lwjgl.LWJGLUtil;
import org.lwjgl.Sys;
/**
* <p/>
* Context encapsulates an OpenGL context.
* <p/>
*
* This class is thread-safe.
*
* @author elias_naur <elias_naur@users.sourceforge.net>
* @version $Revision: 2730 $
* $Id: Context.java 2730 2007-01-17 12:58:38Z elias_naur $
*/
final class Context {
/**
* The platform specific implementation of context methods
*/
private final static ContextImplementation implementation;
/** The current Context */
private final static ThreadLocal current_context_local = new ThreadLocal();
/**
* Handle to the native GL rendering context
*/
private final ByteBuffer handle;
private final PeerInfo peer_info;
/** Whether the context has been destroyed */
private boolean destroyed;
private boolean destroy_requested;
/** The thread that has this context current, or null. */
private Thread thread;
static {
Sys.initialize();
implementation = createImplementation();
}
private static ContextImplementation createImplementation() {
switch (LWJGLUtil.getPlatform()) {
case LWJGLUtil.PLATFORM_WINDOWS:
return new WindowsContextImplementation();
default:
throw new IllegalStateException("Unsupported platform");
}
}
PeerInfo getPeerInfo() {
return peer_info;
}
static Context getCurrentContext() {
return (Context)current_context_local.get();
}
/**
* Create a context with the specified peer info and shared context
*/
public Context(PeerInfo peer_info, Context shared_context) throws LWJGLException {
Context context_lock = shared_context != null ? shared_context : this;
// If shared_context is not null, synchronize on it to make sure it is not deleted
// while this context is created. Otherwise, simply synchronize on ourself to avoid NPE
synchronized (context_lock) {
if (shared_context != null && shared_context.destroyed)
throw new IllegalArgumentException("Shared context is destroyed");
// GLContext.loadOpenGLLibrary();
try {
this.peer_info = peer_info;
this.handle = implementation.create(peer_info, shared_context != null ? shared_context.handle : null);
} catch (LWJGLException e) {
// GLContext.unloadOpenGLLibrary();
throw e;
}
}
}
/**
* Release the current context (if any). After this call, no context is current.
*/
public static void releaseCurrentContext() throws LWJGLException {
Context current_context = getCurrentContext();
if (current_context != null) {
implementation.releaseCurrentContext();
// GLContext.useContext(null);
current_context_local.set(null);
synchronized (current_context) {
current_context.thread = null;
current_context.checkDestroy();
}
}
}
/**
* Release the context from its drawable. This is necessary on some platforms,
* like Mac OS X, where binding the context to a drawable and binding the context
* for rendering are two distinct actions and where calling releaseDrawable
* on every releaseCurrentContext results in artifacts.
*/
public synchronized void releaseDrawable() throws LWJGLException {
if (destroyed)
throw new IllegalStateException("Context is destroyed");
implementation.releaseDrawable(getHandle());
}
/**
* Update the context. Should be called whenever it's drawable is moved or resized
*/
public synchronized void update() {
if (destroyed)
throw new IllegalStateException("Context is destroyed");
implementation.update(getHandle());
}
/**
* Swap the buffers on the current context. Only valid for double-buffered contexts
*/
public static void swapBuffers(PeerInfo peerInfo) throws LWJGLException {
implementation.swapBuffers(peerInfo);
}
private boolean canAccess() {
return thread == null || Thread.currentThread() == thread;
}
private void checkAccess() {
if (!canAccess())
throw new IllegalStateException("From thread " + Thread.currentThread() + ": " + thread + " already has the context current");
}
/**
* Make the context current
*/
public synchronized void makeCurrent() throws LWJGLException {
checkAccess();
if (destroyed)
throw new IllegalStateException("Context is destroyed");
thread = Thread.currentThread();
current_context_local.set(this);
implementation.makeCurrent(peer_info, handle);
// GLContext.useContext(this);
}
ByteBuffer getHandle() {
return handle;
}
/**
* Query whether the context is current
*/
public synchronized boolean isCurrent() throws LWJGLException {
if (destroyed)
throw new IllegalStateException("Context is destroyed");
return implementation.isCurrent(handle);
}
private void checkDestroy() {
if (!destroyed && destroy_requested) {
try {
releaseDrawable();
implementation.destroy(peer_info, handle);
destroyed = true;
thread = null;
// GLContext.unloadOpenGLLibrary();
} catch (LWJGLException e) {
LWJGLUtil.log("Exception occurred while destroying context: " + e);
}
}
}
/**
* Set the buffer swap interval. This call is a best-attempt at changing
* the monitor swap interval, which is the minimum periodicity of color buffer swaps,
* measured in video frame periods, and is not guaranteed to be successful.
*
* A video frame period is the time required to display a full frame of video data.
*
* @param sync true to synchronize; false to ignore synchronization
*/
public static void setSwapInterval(int value) {
implementation.setSwapInterval(value);
}
/**
* Destroy the context. This method behaves the same as destroy() with the extra
* requirement that the context must be either current to the current thread or not
* current at all.
*/
public synchronized void forceDestroy() throws LWJGLException {
checkAccess();
destroy();
}
/**
* Request destruction of the Context. If the context is current, no context will be current after this call.
* The context is destroyed when no thread has it current.
*/
public synchronized void destroy() throws LWJGLException {
if (destroyed)
return;
destroy_requested = true;
boolean was_current = isCurrent();
// int error = GL11.GL_NO_ERROR;
if (was_current) {
// if (GLContext.getCapabilities() != null && GLContext.getCapabilities().OpenGL11)
// error = GL11.glGetError();
releaseCurrentContext();
}
checkDestroy();
// if (was_current && error != GL11.GL_NO_ERROR)
// throw new OpenGLException(error);
}
}
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