/*
* Copyright (c) 2002-2008 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
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* 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.opengl;
import org.lwjgl.LWJGLException;
import org.lwjgl.LWJGLUtil;
import org.lwjgl.Sys;
import org.lwjgl.opengles.EGLContext;
import org.lwjgl.opengles.GLContext;
import org.lwjgl.opengles.GLES20;
import org.lwjgl.opengles.PowerManagementEventException;
import static org.lwjgl.opengles.EGL.*;
/**
* <p/>
* Context encapsulates an OpenGL ES context.
* <p/>
* <p/>
* This class is thread-safe.
*
* @author elias_naur <elias_naur@users.sourceforge.net>
* @version $Revision: 3332 $
* $Id: Context.java 3332 2010-04-20 18:21:05Z spasi $
*/
final class ContextGLES implements org.lwjgl.opengl.Context {
/** The current Context */
private static final ThreadLocal<ContextGLES> current_context_local = new ThreadLocal<ContextGLES>();
/** Handle to the native GL rendering context */
private final DrawableGLES drawable;
private final EGLContext eglContext;
private final org.lwjgl.opengles.ContextAttribs contextAttribs;
/** 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();
}
public EGLContext getEGLContext() {
return eglContext;
}
org.lwjgl.opengles.ContextAttribs getContextAttribs() {
return contextAttribs;
}
static ContextGLES getCurrentContext() {
return current_context_local.get();
}
/** Create a context with the specified peer info and shared context */
ContextGLES(DrawableGLES drawable, org.lwjgl.opengles.ContextAttribs attribs, ContextGLES shared_context) throws LWJGLException {
if ( drawable == null )
throw new IllegalArgumentException();
ContextGLES 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");
this.drawable = drawable;
this.contextAttribs = attribs;
this.eglContext = drawable.getEGLDisplay().createContext(drawable.getEGLConfig(),
shared_context == null ? null : shared_context.eglContext,
attribs == null ? new org.lwjgl.opengles.ContextAttribs(2).getAttribList() : attribs.getAttribList());
}
}
/** Release the current context (if any). After this call, no context is current. */
public void releaseCurrent() throws LWJGLException, PowerManagementEventException {
eglReleaseCurrent(drawable.getEGLDisplay());
org.lwjgl.opengles.GLContext.useContext(null);
current_context_local.set(null);
synchronized ( this ) {
thread = null;
checkDestroy();
}
}
/** Swap the buffers on the current context. Only valid for double-buffered contexts */
public static void swapBuffers() throws LWJGLException, PowerManagementEventException {
ContextGLES current_context = getCurrentContext();
if ( current_context != null )
current_context.drawable.getEGLSurface().swapBuffers();
}
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, PowerManagementEventException {
checkAccess();
if ( destroyed )
throw new IllegalStateException("Context is destroyed");
thread = Thread.currentThread();
current_context_local.set(this);
eglContext.makeCurrent(drawable.getEGLSurface());
org.lwjgl.opengles.GLContext.useContext(this);
}
/** Query whether the context is current */
public synchronized boolean isCurrent() throws LWJGLException {
if ( destroyed )
throw new IllegalStateException("Context is destroyed");
return eglIsCurrentContext(eglContext);
}
private void checkDestroy() {
if ( !destroyed && destroy_requested ) {
try {
eglContext.destroy();
destroyed = true;
thread = null;
} 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.
* <p/>
* A video frame period is the time required to display a full frame of video data.
*/
public static void setSwapInterval(int value) {
ContextGLES current_context = getCurrentContext();
if ( current_context != null ) {
try {
current_context.drawable.getEGLDisplay().setSwapInterval(value);
} catch (LWJGLException e) {
LWJGLUtil.log("Failed to set swap interval. Reason: " + e.getMessage());
}
}
}
/**
* 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 = GLES20.GL_NO_ERROR;
if ( was_current ) {
if ( org.lwjgl.opengles.GLContext.getCapabilities() != null && GLContext.getCapabilities().OpenGLES20 )
error = GLES20.glGetError();
try {
releaseCurrent();
} catch (PowerManagementEventException e) {
// Ignore
}
}
checkDestroy();
if ( was_current && error != GLES20.GL_NO_ERROR )
throw new OpenGLException(error);
}
public void releaseDrawable() throws LWJGLException {
}
}