225 lines
7.8 KiB
Java
225 lines
7.8 KiB
Java
/*
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* Copyright (c) 2002-2008 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl.opengl;
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import org.lwjgl.LWJGLException;
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import org.lwjgl.LWJGLUtil;
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import org.lwjgl.Sys;
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import org.lwjgl.opengles.EGLContext;
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import org.lwjgl.opengles.GLContext;
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import org.lwjgl.opengles.GLES20;
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import org.lwjgl.opengles.PowerManagementEventException;
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import static org.lwjgl.opengles.EGL.*;
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/**
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* <p/>
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* Context encapsulates an OpenGL ES context.
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* <p/>
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* <p/>
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* This class is thread-safe.
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*
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* @author elias_naur <elias_naur@users.sourceforge.net>
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* @version $Revision: 3332 $
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* $Id: Context.java 3332 2010-04-20 18:21:05Z spasi $
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*/
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final class ContextGLES implements org.lwjgl.opengl.Context {
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/** The current Context */
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private static final ThreadLocal<ContextGLES> current_context_local = new ThreadLocal<ContextGLES>();
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/** Handle to the native GL rendering context */
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private final DrawableGLES drawable;
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private final EGLContext eglContext;
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private final org.lwjgl.opengles.ContextAttribs contextAttribs;
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/** Whether the context has been destroyed */
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private boolean destroyed;
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private boolean destroy_requested;
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/** The thread that has this context current, or null. */
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private Thread thread;
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static {
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Sys.initialize();
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}
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public EGLContext getEGLContext() {
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return eglContext;
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}
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org.lwjgl.opengles.ContextAttribs getContextAttribs() {
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return contextAttribs;
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}
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static ContextGLES getCurrentContext() {
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return current_context_local.get();
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}
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/** Create a context with the specified peer info and shared context */
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ContextGLES(DrawableGLES drawable, org.lwjgl.opengles.ContextAttribs attribs, ContextGLES shared_context) throws LWJGLException {
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if ( drawable == null )
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throw new IllegalArgumentException();
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ContextGLES context_lock = shared_context != null ? shared_context : this;
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// If shared_context is not null, synchronize on it to make sure it is not deleted
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// while this context is created. Otherwise, simply synchronize on ourself to avoid NPE
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synchronized ( context_lock ) {
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if ( shared_context != null && shared_context.destroyed )
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throw new IllegalArgumentException("Shared context is destroyed");
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this.drawable = drawable;
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this.contextAttribs = attribs;
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this.eglContext = drawable.getEGLDisplay().createContext(drawable.getEGLConfig(),
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shared_context == null ? null : shared_context.eglContext,
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attribs == null ? new org.lwjgl.opengles.ContextAttribs(2).getAttribList() : attribs.getAttribList());
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}
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}
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/** Release the current context (if any). After this call, no context is current. */
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public void releaseCurrent() throws LWJGLException, PowerManagementEventException {
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eglReleaseCurrent(drawable.getEGLDisplay());
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org.lwjgl.opengles.GLContext.useContext(null);
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current_context_local.set(null);
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synchronized ( this ) {
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thread = null;
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checkDestroy();
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}
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}
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/** Swap the buffers on the current context. Only valid for double-buffered contexts */
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public static void swapBuffers() throws LWJGLException, PowerManagementEventException {
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ContextGLES current_context = getCurrentContext();
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if ( current_context != null )
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current_context.drawable.getEGLSurface().swapBuffers();
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}
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private boolean canAccess() {
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return thread == null || Thread.currentThread() == thread;
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}
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private void checkAccess() {
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if ( !canAccess() )
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throw new IllegalStateException("From thread " + Thread.currentThread() + ": " + thread + " already has the context current");
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}
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/** Make the context current */
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public synchronized void makeCurrent() throws LWJGLException, PowerManagementEventException {
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checkAccess();
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if ( destroyed )
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throw new IllegalStateException("Context is destroyed");
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thread = Thread.currentThread();
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current_context_local.set(this);
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eglContext.makeCurrent(drawable.getEGLSurface());
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org.lwjgl.opengles.GLContext.useContext(this);
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}
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/** Query whether the context is current */
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public synchronized boolean isCurrent() throws LWJGLException {
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if ( destroyed )
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throw new IllegalStateException("Context is destroyed");
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return eglIsCurrentContext(eglContext);
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}
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private void checkDestroy() {
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if ( !destroyed && destroy_requested ) {
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try {
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eglContext.destroy();
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destroyed = true;
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thread = null;
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} catch (LWJGLException e) {
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LWJGLUtil.log("Exception occurred while destroying context: " + e);
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}
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}
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}
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/**
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* Set the buffer swap interval. This call is a best-attempt at changing
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* the monitor swap interval, which is the minimum periodicity of color buffer swaps,
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* measured in video frame periods, and is not guaranteed to be successful.
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* <p/>
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* A video frame period is the time required to display a full frame of video data.
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*/
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public static void setSwapInterval(int value) {
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ContextGLES current_context = getCurrentContext();
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if ( current_context != null ) {
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try {
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current_context.drawable.getEGLDisplay().setSwapInterval(value);
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} catch (LWJGLException e) {
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LWJGLUtil.log("Failed to set swap interval. Reason: " + e.getMessage());
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}
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}
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}
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/**
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* Destroy the context. This method behaves the same as destroy() with the extra
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* requirement that the context must be either current to the current thread or not
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* current at all.
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*/
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public synchronized void forceDestroy() throws LWJGLException {
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checkAccess();
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destroy();
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}
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/**
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* Request destruction of the Context. If the context is current, no context will be current after this call.
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* The context is destroyed when no thread has it current.
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*/
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public synchronized void destroy() throws LWJGLException {
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if ( destroyed )
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return;
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destroy_requested = true;
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boolean was_current = isCurrent();
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int error = GLES20.GL_NO_ERROR;
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if ( was_current ) {
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if ( org.lwjgl.opengles.GLContext.getCapabilities() != null && GLContext.getCapabilities().OpenGLES20 )
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error = GLES20.glGetError();
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try {
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releaseCurrent();
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} catch (PowerManagementEventException e) {
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// Ignore
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}
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}
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checkDestroy();
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if ( was_current && error != GLES20.GL_NO_ERROR )
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throw new OpenGLException(error);
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}
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public void releaseDrawable() throws LWJGLException {
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}
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}
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