sdk/android/src/java/org/webrtc/EglBase14Impl.java - src - Git at Google

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */

 package org.webrtc;

 import android.graphics.SurfaceTexture;
 import android.opengl.EGL14;
 import android.opengl.EGLConfig;
 import android.opengl.EGLContext;
 import android.opengl.EGLDisplay;
 import android.opengl.EGLExt;
 import android.opengl.EGLSurface;
 import android.opengl.GLException;
 import android.view.Surface;
 import androidx.annotation.Nullable;

 /**
  * Holds EGL state and utility methods for handling an EGL14 EGLContext, an EGLDisplay,
  * and an EGLSurface.
  */
 @SuppressWarnings("ReferenceEquality") // We want to compare to EGL14 constants.
 class EglBase14Impl implements EglBase14 {
   private static final String TAG = "EglBase14Impl";
   private static final EglConnection EGL_NO_CONNECTION = new EglConnection();

   private EGLSurface eglSurface = EGL14.EGL_NO_SURFACE;
   private EglConnection eglConnection;

   public static class Context implements EglBase14.Context {
     private final EGLContext egl14Context;

     @Override
     public EGLContext getRawContext() {
       return egl14Context;
     }

     @Override
     public long getNativeEglContext() {
       return egl14Context.getNativeHandle();
     }

     public Context(android.opengl.EGLContext eglContext) {
       this.egl14Context = eglContext;
     }
   }

   public static class EglConnection implements EglBase14.EglConnection {
     private final EGLContext eglContext;
     private final EGLDisplay eglDisplay;
     private final EGLConfig eglConfig;
     private final RefCountDelegate refCountDelegate;
     private EGLSurface currentSurface = EGL14.EGL_NO_SURFACE;

     public EglConnection(EGLContext sharedContext, int[] configAttributes) {
       eglDisplay = getEglDisplay();
       eglConfig = getEglConfig(eglDisplay, configAttributes);
       final int openGlesVersion = EglBase.getOpenGlesVersionFromConfig(configAttributes);
       Logging.d(TAG, "Using OpenGL ES version " + openGlesVersion);
       eglContext = createEglContext(sharedContext, eglDisplay, eglConfig, openGlesVersion);

       // Ref count delegate with release callback.
       refCountDelegate = new RefCountDelegate(() -> {
         synchronized (EglBase.lock) {
           EGL14.eglMakeCurrent(
               eglDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_CONTEXT);
           EGL14.eglDestroyContext(eglDisplay, eglContext);
         }
         EGL14.eglReleaseThread();
         EGL14.eglTerminate(eglDisplay);
         currentSurface = EGL14.EGL_NO_SURFACE;
       });
     }

     // Returns a "null" EglConnection. Useful to represent a released instance with default values.
     private EglConnection() {
       eglContext = EGL14.EGL_NO_CONTEXT;
       eglDisplay = EGL14.EGL_NO_DISPLAY;
       eglConfig = null;
       refCountDelegate = new RefCountDelegate(() -> {});
     }

     @Override
     public void retain() {
       refCountDelegate.retain();
     }

     @Override
     public void release() {
       refCountDelegate.release();
     }

     @Override
     public EGLContext getContext() {
       return eglContext;
     }

     @Override
     public EGLDisplay getDisplay() {
       return eglDisplay;
     }

     @Override
     public EGLConfig getConfig() {
       return eglConfig;
     }

     public void makeCurrent(EGLSurface eglSurface) {
       if (EGL14.eglGetCurrentContext() == eglContext && currentSurface == eglSurface) {
         return;
       }

       synchronized (EglBase.lock) {
         if (!EGL14.eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext)) {
           throw new GLException(EGL14.eglGetError(),
               "eglMakeCurrent failed: 0x" + Integer.toHexString(EGL14.eglGetError()));
         }
       }
       currentSurface = eglSurface;
     }

     public void detachCurrent() {
       synchronized (EglBase.lock) {
         if (!EGL14.eglMakeCurrent(
                 eglDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_CONTEXT)) {
           throw new GLException(EGL14.eglGetError(),
               "eglDetachCurrent failed: 0x" + Integer.toHexString(EGL14.eglGetError()));
         }
       }
       currentSurface = EGL14.EGL_NO_SURFACE;
     }
   }
   // Create a new context with the specified config type, sharing data with sharedContext.
   // `sharedContext` may be null.
   public EglBase14Impl(EGLContext sharedContext, int[] configAttributes) {
     this.eglConnection = new EglConnection(sharedContext, configAttributes);
   }

   // Create a new EglBase using an existing, possibly externally managed, EglConnection.
   public EglBase14Impl(EglConnection eglConnection) {
     this.eglConnection = eglConnection;
     this.eglConnection.retain();
   }

   // Create EGLSurface from the Android Surface.
   @Override
   public void createSurface(Surface surface) {
     createSurfaceInternal(surface);
   }

   // Create EGLSurface from the Android SurfaceTexture.
   @Override
   public void createSurface(SurfaceTexture surfaceTexture) {
     createSurfaceInternal(surfaceTexture);
   }

   // Create EGLSurface from either Surface or SurfaceTexture.
   private void createSurfaceInternal(Object surface) {
     if (!(surface instanceof Surface) && !(surface instanceof SurfaceTexture)) {
       throw new IllegalStateException("Input must be either a Surface or SurfaceTexture");
     }
     checkIsNotReleased();
     if (eglSurface != EGL14.EGL_NO_SURFACE) {
       throw new RuntimeException("Already has an EGLSurface");
     }
     int[] surfaceAttribs = {EGL14.EGL_NONE};
     eglSurface = EGL14.eglCreateWindowSurface(
         eglConnection.getDisplay(), eglConnection.getConfig(), surface, surfaceAttribs, 0);
     if (eglSurface == EGL14.EGL_NO_SURFACE) {
       throw new GLException(EGL14.eglGetError(),
           "Failed to create window surface: 0x" + Integer.toHexString(EGL14.eglGetError()));
     }
   }

   @Override
   public void createDummyPbufferSurface() {
     createPbufferSurface(1, 1);
   }

   @Override
   public void createPbufferSurface(int width, int height) {
     checkIsNotReleased();
     if (eglSurface != EGL14.EGL_NO_SURFACE) {
       throw new RuntimeException("Already has an EGLSurface");
     }
     int[] surfaceAttribs = {EGL14.EGL_WIDTH, width, EGL14.EGL_HEIGHT, height, EGL14.EGL_NONE};
     eglSurface = EGL14.eglCreatePbufferSurface(
         eglConnection.getDisplay(), eglConnection.getConfig(), surfaceAttribs, 0);
     if (eglSurface == EGL14.EGL_NO_SURFACE) {
       throw new GLException(EGL14.eglGetError(),
           "Failed to create pixel buffer surface with size " + width + "x" + height + ": 0x"
               + Integer.toHexString(EGL14.eglGetError()));
     }
   }

   @Override
   public Context getEglBaseContext() {
     return new Context(eglConnection.getContext());
   }

   @Override
   public boolean hasSurface() {
     return eglSurface != EGL14.EGL_NO_SURFACE;
   }

   @Override
   public int surfaceWidth() {
     final int[] widthArray = new int[1];
     EGL14.eglQuerySurface(eglConnection.getDisplay(), eglSurface, EGL14.EGL_WIDTH, widthArray, 0);
     return widthArray[0];
   }

   @Override
   public int surfaceHeight() {
     final int[] heightArray = new int[1];
     EGL14.eglQuerySurface(eglConnection.getDisplay(), eglSurface, EGL14.EGL_HEIGHT, heightArray, 0);
     return heightArray[0];
   }

   @Override
   public void releaseSurface() {
     if (eglSurface != EGL14.EGL_NO_SURFACE) {
       EGL14.eglDestroySurface(eglConnection.getDisplay(), eglSurface);
       eglSurface = EGL14.EGL_NO_SURFACE;
     }
   }

   private void checkIsNotReleased() {
     if (eglConnection == EGL_NO_CONNECTION) {
       throw new RuntimeException("This object has been released");
     }
   }

   @Override
   public void release() {
     checkIsNotReleased();
     releaseSurface();
     eglConnection.release();
     eglConnection = EGL_NO_CONNECTION;
   }

   @Override
   public void makeCurrent() {
     checkIsNotReleased();
     if (eglSurface == EGL14.EGL_NO_SURFACE) {
       throw new RuntimeException("No EGLSurface - can't make current");
     }
     eglConnection.makeCurrent(eglSurface);
   }

   // Detach the current EGL context, so that it can be made current on another thread.
   @Override
   public void detachCurrent() {
     eglConnection.detachCurrent();
   }

   @Override
   public void swapBuffers() {
     checkIsNotReleased();
     if (eglSurface == EGL14.EGL_NO_SURFACE) {
       throw new RuntimeException("No EGLSurface - can't swap buffers");
     }
     synchronized (EglBase.lock) {
       EGL14.eglSwapBuffers(eglConnection.getDisplay(), eglSurface);
     }
   }

   @Override
   public void swapBuffers(long timeStampNs) {
     checkIsNotReleased();
     if (eglSurface == EGL14.EGL_NO_SURFACE) {
       throw new RuntimeException("No EGLSurface - can't swap buffers");
     }
     synchronized (EglBase.lock) {
       // See
       // https://android.googlesource.com/platform/frameworks/native/+/tools_r22.2/opengl/specs/EGL_ANDROID_presentation_time.txt
       EGLExt.eglPresentationTimeANDROID(eglConnection.getDisplay(), eglSurface, timeStampNs);
       EGL14.eglSwapBuffers(eglConnection.getDisplay(), eglSurface);
     }
   }

   // Return an EGLDisplay, or die trying.
   private static EGLDisplay getEglDisplay() {
     EGLDisplay eglDisplay = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
     if (eglDisplay == EGL14.EGL_NO_DISPLAY) {
       throw new GLException(EGL14.eglGetError(),
           "Unable to get EGL14 display: 0x" + Integer.toHexString(EGL14.eglGetError()));
     }
     int[] version = new int[2];
     if (!EGL14.eglInitialize(eglDisplay, version, 0, version, 1)) {
       throw new GLException(EGL14.eglGetError(),
           "Unable to initialize EGL14: 0x" + Integer.toHexString(EGL14.eglGetError()));
     }
     return eglDisplay;
   }

   // Return an EGLConfig, or die trying.
   private static EGLConfig getEglConfig(EGLDisplay eglDisplay, int[] configAttributes) {
     EGLConfig[] configs = new EGLConfig[1];
     int[] numConfigs = new int[1];
     if (!EGL14.eglChooseConfig(
             eglDisplay, configAttributes, 0, configs, 0, configs.length, numConfigs, 0)) {
       throw new GLException(EGL14.eglGetError(),
           "eglChooseConfig failed: 0x" + Integer.toHexString(EGL14.eglGetError()));
     }
     if (numConfigs[0] <= 0) {
       throw new RuntimeException("Unable to find any matching EGL config");
     }
     final EGLConfig eglConfig = configs[0];
     if (eglConfig == null) {
       throw new RuntimeException("eglChooseConfig returned null");
     }
     return eglConfig;
   }

   // Return an EGLConfig, or die trying.
   private static EGLContext createEglContext(@Nullable EGLContext sharedContext,
       EGLDisplay eglDisplay, EGLConfig eglConfig, int openGlesVersion) {
     if (sharedContext != null && sharedContext == EGL14.EGL_NO_CONTEXT) {
       throw new RuntimeException("Invalid sharedContext");
     }
     int[] contextAttributes = {EGL14.EGL_CONTEXT_CLIENT_VERSION, openGlesVersion, EGL14.EGL_NONE};
     EGLContext rootContext = sharedContext == null ? EGL14.EGL_NO_CONTEXT : sharedContext;
     final EGLContext eglContext;
     synchronized (EglBase.lock) {
       eglContext = EGL14.eglCreateContext(eglDisplay, eglConfig, rootContext, contextAttributes, 0);
     }
     if (eglContext == EGL14.EGL_NO_CONTEXT) {
       throw new GLException(EGL14.eglGetError(),
           "Failed to create EGL context: 0x" + Integer.toHexString(EGL14.eglGetError()));
     }
     return eglContext;
   }
 }
	/*
	* Copyright 2015 The WebRTC project authors. All Rights Reserved.
	*
	* Use of this source code is governed by a BSD-style license
	* that can be found in the LICENSE file in the root of the source
	* tree. An additional intellectual property rights grant can be found
	* in the file PATENTS. All contributing project authors may
	* be found in the AUTHORS file in the root of the source tree.
	*/

	package org.webrtc;

	import android.graphics.SurfaceTexture;
	import android.opengl.EGL14;
	import android.opengl.EGLConfig;
	import android.opengl.EGLContext;
	import android.opengl.EGLDisplay;
	import android.opengl.EGLExt;
	import android.opengl.EGLSurface;
	import android.opengl.GLException;
	import android.view.Surface;
	import androidx.annotation.Nullable;

	/**
	* Holds EGL state and utility methods for handling an EGL14 EGLContext, an EGLDisplay,
	* and an EGLSurface.
	*/
	@SuppressWarnings("ReferenceEquality") // We want to compare to EGL14 constants.
	class EglBase14Impl implements EglBase14 {
	private static final String TAG = "EglBase14Impl";
	private static final EglConnection EGL_NO_CONNECTION = new EglConnection();

	private EGLSurface eglSurface = EGL14.EGL_NO_SURFACE;
	private EglConnection eglConnection;

	public static class Context implements EglBase14.Context {
	private final EGLContext egl14Context;

	@Override
	public EGLContext getRawContext() {
	return egl14Context;
	}

	@Override
	public long getNativeEglContext() {
	return egl14Context.getNativeHandle();
	}

	public Context(android.opengl.EGLContext eglContext) {
	this.egl14Context = eglContext;
	}
	}

	public static class EglConnection implements EglBase14.EglConnection {
	private final EGLContext eglContext;
	private final EGLDisplay eglDisplay;
	private final EGLConfig eglConfig;
	private final RefCountDelegate refCountDelegate;
	private EGLSurface currentSurface = EGL14.EGL_NO_SURFACE;

	public EglConnection(EGLContext sharedContext, int[] configAttributes) {
	eglDisplay = getEglDisplay();
	eglConfig = getEglConfig(eglDisplay, configAttributes);
	final int openGlesVersion = EglBase.getOpenGlesVersionFromConfig(configAttributes);
	Logging.d(TAG, "Using OpenGL ES version " + openGlesVersion);
	eglContext = createEglContext(sharedContext, eglDisplay, eglConfig, openGlesVersion);

	// Ref count delegate with release callback.
	refCountDelegate = new RefCountDelegate(() -> {
	synchronized (EglBase.lock) {
	EGL14.eglMakeCurrent(
	eglDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_CONTEXT);
	EGL14.eglDestroyContext(eglDisplay, eglContext);
	}
	EGL14.eglReleaseThread();
	EGL14.eglTerminate(eglDisplay);
	currentSurface = EGL14.EGL_NO_SURFACE;
	});
	}

	// Returns a "null" EglConnection. Useful to represent a released instance with default values.
	private EglConnection() {
	eglContext = EGL14.EGL_NO_CONTEXT;
	eglDisplay = EGL14.EGL_NO_DISPLAY;
	eglConfig = null;
	refCountDelegate = new RefCountDelegate(() -> {});
	}

	@Override
	public void retain() {
	refCountDelegate.retain();
	}

	@Override
	public void release() {
	refCountDelegate.release();
	}

	@Override
	public EGLContext getContext() {
	return eglContext;
	}

	@Override
	public EGLDisplay getDisplay() {
	return eglDisplay;
	}

	@Override
	public EGLConfig getConfig() {
	return eglConfig;
	}

	public void makeCurrent(EGLSurface eglSurface) {
	if (EGL14.eglGetCurrentContext() == eglContext && currentSurface == eglSurface) {
	return;
	}

	synchronized (EglBase.lock) {
	if (!EGL14.eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext)) {
	throw new GLException(EGL14.eglGetError(),
	"eglMakeCurrent failed: 0x" + Integer.toHexString(EGL14.eglGetError()));
	}
	}
	currentSurface = eglSurface;
	}

	public void detachCurrent() {
	synchronized (EglBase.lock) {
	if (!EGL14.eglMakeCurrent(
	eglDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_CONTEXT)) {
	throw new GLException(EGL14.eglGetError(),
	"eglDetachCurrent failed: 0x" + Integer.toHexString(EGL14.eglGetError()));
	}
	}
	currentSurface = EGL14.EGL_NO_SURFACE;
	}
	}
	// Create a new context with the specified config type, sharing data with sharedContext.
	// `sharedContext` may be null.
	public EglBase14Impl(EGLContext sharedContext, int[] configAttributes) {
	this.eglConnection = new EglConnection(sharedContext, configAttributes);
	}

	// Create a new EglBase using an existing, possibly externally managed, EglConnection.
	public EglBase14Impl(EglConnection eglConnection) {
	this.eglConnection = eglConnection;
	this.eglConnection.retain();
	}

	// Create EGLSurface from the Android Surface.
	@Override
	public void createSurface(Surface surface) {
	createSurfaceInternal(surface);
	}

	// Create EGLSurface from the Android SurfaceTexture.
	@Override
	public void createSurface(SurfaceTexture surfaceTexture) {
	createSurfaceInternal(surfaceTexture);
	}

	// Create EGLSurface from either Surface or SurfaceTexture.
	private void createSurfaceInternal(Object surface) {
	if (!(surface instanceof Surface) && !(surface instanceof SurfaceTexture)) {
	throw new IllegalStateException("Input must be either a Surface or SurfaceTexture");
	}
	checkIsNotReleased();
	if (eglSurface != EGL14.EGL_NO_SURFACE) {
	throw new RuntimeException("Already has an EGLSurface");
	}
	int[] surfaceAttribs = {EGL14.EGL_NONE};
	eglSurface = EGL14.eglCreateWindowSurface(
	eglConnection.getDisplay(), eglConnection.getConfig(), surface, surfaceAttribs, 0);
	if (eglSurface == EGL14.EGL_NO_SURFACE) {
	throw new GLException(EGL14.eglGetError(),
	"Failed to create window surface: 0x" + Integer.toHexString(EGL14.eglGetError()));
	}
	}

	@Override
	public void createDummyPbufferSurface() {
	createPbufferSurface(1, 1);
	}

	@Override
	public void createPbufferSurface(int width, int height) {
	checkIsNotReleased();
	if (eglSurface != EGL14.EGL_NO_SURFACE) {
	throw new RuntimeException("Already has an EGLSurface");
	}
	int[] surfaceAttribs = {EGL14.EGL_WIDTH, width, EGL14.EGL_HEIGHT, height, EGL14.EGL_NONE};
	eglSurface = EGL14.eglCreatePbufferSurface(
	eglConnection.getDisplay(), eglConnection.getConfig(), surfaceAttribs, 0);
	if (eglSurface == EGL14.EGL_NO_SURFACE) {
	throw new GLException(EGL14.eglGetError(),
	"Failed to create pixel buffer surface with size " + width + "x" + height + ": 0x"
	+ Integer.toHexString(EGL14.eglGetError()));
	}
	}

	@Override
	public Context getEglBaseContext() {
	return new Context(eglConnection.getContext());
	}

	@Override
	public boolean hasSurface() {
	return eglSurface != EGL14.EGL_NO_SURFACE;
	}

	@Override
	public int surfaceWidth() {
	final int[] widthArray = new int[1];
	EGL14.eglQuerySurface(eglConnection.getDisplay(), eglSurface, EGL14.EGL_WIDTH, widthArray, 0);
	return widthArray[0];
	}

	@Override
	public int surfaceHeight() {
	final int[] heightArray = new int[1];
	EGL14.eglQuerySurface(eglConnection.getDisplay(), eglSurface, EGL14.EGL_HEIGHT, heightArray, 0);
	return heightArray[0];
	}

	@Override
	public void releaseSurface() {
	if (eglSurface != EGL14.EGL_NO_SURFACE) {
	EGL14.eglDestroySurface(eglConnection.getDisplay(), eglSurface);
	eglSurface = EGL14.EGL_NO_SURFACE;
	}
	}

	private void checkIsNotReleased() {
	if (eglConnection == EGL_NO_CONNECTION) {
	throw new RuntimeException("This object has been released");
	}
	}

	@Override
	public void release() {
	checkIsNotReleased();
	releaseSurface();
	eglConnection.release();
	eglConnection = EGL_NO_CONNECTION;
	}

	@Override
	public void makeCurrent() {
	checkIsNotReleased();
	if (eglSurface == EGL14.EGL_NO_SURFACE) {
	throw new RuntimeException("No EGLSurface - can't make current");
	}
	eglConnection.makeCurrent(eglSurface);
	}

	// Detach the current EGL context, so that it can be made current on another thread.
	@Override
	public void detachCurrent() {
	eglConnection.detachCurrent();
	}

	@Override
	public void swapBuffers() {
	checkIsNotReleased();
	if (eglSurface == EGL14.EGL_NO_SURFACE) {
	throw new RuntimeException("No EGLSurface - can't swap buffers");
	}
	synchronized (EglBase.lock) {
	EGL14.eglSwapBuffers(eglConnection.getDisplay(), eglSurface);
	}
	}

	@Override
	public void swapBuffers(long timeStampNs) {
	checkIsNotReleased();
	if (eglSurface == EGL14.EGL_NO_SURFACE) {
	throw new RuntimeException("No EGLSurface - can't swap buffers");
	}
	synchronized (EglBase.lock) {
	// See
	// https://android.googlesource.com/platform/frameworks/native/+/tools_r22.2/opengl/specs/EGL_ANDROID_presentation_time.txt
	EGLExt.eglPresentationTimeANDROID(eglConnection.getDisplay(), eglSurface, timeStampNs);
	EGL14.eglSwapBuffers(eglConnection.getDisplay(), eglSurface);
	}
	}

	// Return an EGLDisplay, or die trying.
	private static EGLDisplay getEglDisplay() {
	EGLDisplay eglDisplay = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
	if (eglDisplay == EGL14.EGL_NO_DISPLAY) {
	throw new GLException(EGL14.eglGetError(),
	"Unable to get EGL14 display: 0x" + Integer.toHexString(EGL14.eglGetError()));
	}
	int[] version = new int[2];
	if (!EGL14.eglInitialize(eglDisplay, version, 0, version, 1)) {
	throw new GLException(EGL14.eglGetError(),
	"Unable to initialize EGL14: 0x" + Integer.toHexString(EGL14.eglGetError()));
	}
	return eglDisplay;
	}

	// Return an EGLConfig, or die trying.
	private static EGLConfig getEglConfig(EGLDisplay eglDisplay, int[] configAttributes) {
	EGLConfig[] configs = new EGLConfig[1];
	int[] numConfigs = new int[1];
	if (!EGL14.eglChooseConfig(
	eglDisplay, configAttributes, 0, configs, 0, configs.length, numConfigs, 0)) {
	throw new GLException(EGL14.eglGetError(),
	"eglChooseConfig failed: 0x" + Integer.toHexString(EGL14.eglGetError()));
	}
	if (numConfigs[0] <= 0) {
	throw new RuntimeException("Unable to find any matching EGL config");
	}
	final EGLConfig eglConfig = configs[0];
	if (eglConfig == null) {
	throw new RuntimeException("eglChooseConfig returned null");
	}
	return eglConfig;
	}

	// Return an EGLConfig, or die trying.
	private static EGLContext createEglContext(@Nullable EGLContext sharedContext,
	EGLDisplay eglDisplay, EGLConfig eglConfig, int openGlesVersion) {
	if (sharedContext != null && sharedContext == EGL14.EGL_NO_CONTEXT) {
	throw new RuntimeException("Invalid sharedContext");
	}
	int[] contextAttributes = {EGL14.EGL_CONTEXT_CLIENT_VERSION, openGlesVersion, EGL14.EGL_NONE};
	EGLContext rootContext = sharedContext == null ? EGL14.EGL_NO_CONTEXT : sharedContext;
	final EGLContext eglContext;
	synchronized (EglBase.lock) {
	eglContext = EGL14.eglCreateContext(eglDisplay, eglConfig, rootContext, contextAttributes, 0);
	}
	if (eglContext == EGL14.EGL_NO_CONTEXT) {
	throw new GLException(EGL14.eglGetError(),
	"Failed to create EGL context: 0x" + Integer.toHexString(EGL14.eglGetError()));
	}
	return eglContext;
	}
	}