sdk/android/src/java/org/webrtc/EglBase10Impl.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.Canvas;
 import android.graphics.Rect;
 import android.graphics.SurfaceTexture;
 import android.opengl.GLException;
 import android.view.Surface;
 import android.view.SurfaceHolder;
 import androidx.annotation.Nullable;
 import javax.microedition.khronos.egl.EGL10;
 import javax.microedition.khronos.egl.EGLConfig;
 import javax.microedition.khronos.egl.EGLContext;
 import javax.microedition.khronos.egl.EGLDisplay;
 import javax.microedition.khronos.egl.EGLSurface;

 /**
  * Holds EGL state and utility methods for handling an egl 1.0 EGLContext, an EGLDisplay,
  * and an EGLSurface.
  */
 class EglBase10Impl implements EglBase10 {
   private static final String TAG = "EglBase10Impl";
   // This constant is taken from EGL14.EGL_CONTEXT_CLIENT_VERSION.
   private static final int EGL_CONTEXT_CLIENT_VERSION = 0x3098;

   private static final EglConnection EGL_NO_CONNECTION = new EglConnection();

   private EGLSurface eglSurface = EGL10.EGL_NO_SURFACE;
   private EglConnection eglConnection;

   // EGL wrapper for an actual EGLContext.
   private static class Context implements EglBase10.Context {
     private final EGL10 egl;
     private final EGLContext eglContext;
     private final EGLConfig eglContextConfig;

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

     @Override
     public long getNativeEglContext() {
       EGLContext previousContext = egl.eglGetCurrentContext();
       EGLDisplay currentDisplay = egl.eglGetCurrentDisplay();
       EGLSurface previousDrawSurface = egl.eglGetCurrentSurface(EGL10.EGL_DRAW);
       EGLSurface previousReadSurface = egl.eglGetCurrentSurface(EGL10.EGL_READ);
       EGLSurface tempEglSurface = null;

       if (currentDisplay == EGL10.EGL_NO_DISPLAY) {
         currentDisplay = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
       }

       try {
         if (previousContext != eglContext) {
           int[] surfaceAttribs = {EGL10.EGL_WIDTH, 1, EGL10.EGL_HEIGHT, 1, EGL10.EGL_NONE};
           tempEglSurface =
               egl.eglCreatePbufferSurface(currentDisplay, eglContextConfig, surfaceAttribs);
           if (!egl.eglMakeCurrent(currentDisplay, tempEglSurface, tempEglSurface, eglContext)) {
             throw new GLException(egl.eglGetError(),
                 "Failed to make temporary EGL surface active: " + egl.eglGetError());
           }
         }

         return nativeGetCurrentNativeEGLContext();
       } finally {
         if (tempEglSurface != null) {
           egl.eglMakeCurrent(
               currentDisplay, previousDrawSurface, previousReadSurface, previousContext);
           egl.eglDestroySurface(currentDisplay, tempEglSurface);
         }
       }
     }

     public Context(EGL10 egl, EGLContext eglContext, EGLConfig eglContextConfig) {
       this.egl = egl;
       this.eglContext = eglContext;
       this.eglContextConfig = eglContextConfig;
     }
   }

   public static class EglConnection implements EglBase10.EglConnection {
     private final EGL10 egl;
     private final EGLContext eglContext;
     private final EGLDisplay eglDisplay;
     private final EGLConfig eglConfig;
     private final RefCountDelegate refCountDelegate;
     private EGLSurface currentSurface = EGL10.EGL_NO_SURFACE;

     public EglConnection(EGLContext sharedContext, int[] configAttributes) {
       egl = (EGL10) EGLContext.getEGL();
       eglDisplay = getEglDisplay(egl);
       eglConfig = getEglConfig(egl, eglDisplay, configAttributes);
       final int openGlesVersion = EglBase.getOpenGlesVersionFromConfig(configAttributes);
       Logging.d(TAG, "Using OpenGL ES version " + openGlesVersion);
       eglContext = createEglContext(egl, sharedContext, eglDisplay, eglConfig, openGlesVersion);

       // Ref count delegate with release callback.
       refCountDelegate = new RefCountDelegate(() -> {
         synchronized (EglBase.lock) {
           egl.eglMakeCurrent(
               eglDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT);
         }
         egl.eglDestroyContext(eglDisplay, eglContext);
         egl.eglTerminate(eglDisplay);
         currentSurface = EGL10.EGL_NO_SURFACE;
       });
     }

     // Returns a "null" EglConnection. Useful to represent a released instance with default values.
     private EglConnection() {
       egl = (EGL10) EGLContext.getEGL();
       eglContext = EGL10.EGL_NO_CONTEXT;
       eglDisplay = EGL10.EGL_NO_DISPLAY;
       eglConfig = null;
       refCountDelegate = new RefCountDelegate(() -> {});
     }

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

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

     @Override
     public EGL10 getEgl() {
       return egl;
     }

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

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

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

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

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

     public void detachCurrent() {
       synchronized (EglBase.lock) {
         if (!egl.eglMakeCurrent(
                 eglDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT)) {
           throw new GLException(egl.eglGetError(),
               "eglDetachCurrent failed: 0x" + Integer.toHexString(egl.eglGetError()));
         }
       }
       currentSurface = EGL10.EGL_NO_SURFACE;
     }
   }

   // Create a new context with the specified config type, sharing data with sharedContext.
   public EglBase10Impl(EGLContext sharedContext, int[] configAttributes) {
     this.eglConnection = new EglConnection(sharedContext, configAttributes);
   }

   public EglBase10Impl(EglConnection eglConnection) {
     this.eglConnection = eglConnection;
     this.eglConnection.retain();
   }

   @Override
   public void createSurface(Surface surface) {
     /**
      * We have to wrap Surface in a SurfaceHolder because for some reason eglCreateWindowSurface
      * couldn't actually take a Surface object until API 17. Older versions fortunately just call
      * SurfaceHolder.getSurface(), so we'll do that. No other methods are relevant.
      */
     class FakeSurfaceHolder implements SurfaceHolder {
       private final Surface surface;

       FakeSurfaceHolder(Surface surface) {
         this.surface = surface;
       }

       @Override
       public void addCallback(Callback callback) {}

       @Override
       public void removeCallback(Callback callback) {}

       @Override
       public boolean isCreating() {
         return false;
       }

       @Deprecated
       @Override
       public void setType(int i) {}

       @Override
       public void setFixedSize(int i, int i2) {}

       @Override
       public void setSizeFromLayout() {}

       @Override
       public void setFormat(int i) {}

       @Override
       public void setKeepScreenOn(boolean b) {}

       @Nullable
       @Override
       public Canvas lockCanvas() {
         return null;
       }

       @Nullable
       @Override
       public Canvas lockCanvas(Rect rect) {
         return null;
       }

       @Override
       public void unlockCanvasAndPost(Canvas canvas) {}

       @Nullable
       @Override
       public Rect getSurfaceFrame() {
         return null;
       }

       @Override
       public Surface getSurface() {
         return surface;
       }
     }

     createSurfaceInternal(new FakeSurfaceHolder(surface));
   }

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

   // Create EGLSurface from either a SurfaceHolder or a SurfaceTexture.
   private void createSurfaceInternal(Object nativeWindow) {
     if (!(nativeWindow instanceof SurfaceHolder) && !(nativeWindow instanceof SurfaceTexture)) {
       throw new IllegalStateException("Input must be either a SurfaceHolder or SurfaceTexture");
     }
     checkIsNotReleased();
     if (eglSurface != EGL10.EGL_NO_SURFACE) {
       throw new RuntimeException("Already has an EGLSurface");
     }

     EGL10 egl = eglConnection.getEgl();
     int[] surfaceAttribs = {EGL10.EGL_NONE};
     eglSurface = egl.eglCreateWindowSurface(
         eglConnection.getDisplay(), eglConnection.getConfig(), nativeWindow, surfaceAttribs);
     if (eglSurface == EGL10.EGL_NO_SURFACE) {
       throw new GLException(egl.eglGetError(),
           "Failed to create window surface: 0x" + Integer.toHexString(egl.eglGetError()));
     }
   }

   // Create dummy 1x1 pixel buffer surface so the context can be made current.
   @Override
   public void createDummyPbufferSurface() {
     createPbufferSurface(1, 1);
   }

   @Override
   public void createPbufferSurface(int width, int height) {
     checkIsNotReleased();
     if (eglSurface != EGL10.EGL_NO_SURFACE) {
       throw new RuntimeException("Already has an EGLSurface");
     }
     EGL10 egl = eglConnection.getEgl();
     int[] surfaceAttribs = {EGL10.EGL_WIDTH, width, EGL10.EGL_HEIGHT, height, EGL10.EGL_NONE};
     eglSurface = egl.eglCreatePbufferSurface(
         eglConnection.getDisplay(), eglConnection.getConfig(), surfaceAttribs);
     if (eglSurface == EGL10.EGL_NO_SURFACE) {
       throw new GLException(egl.eglGetError(),
           "Failed to create pixel buffer surface with size " + width + "x" + height + ": 0x"
               + Integer.toHexString(egl.eglGetError()));
     }
   }

   @Override
   public org.webrtc.EglBase.Context getEglBaseContext() {
     return new Context(
         eglConnection.getEgl(), eglConnection.getContext(), eglConnection.getConfig());
   }

   @Override
   public boolean hasSurface() {
     return eglSurface != EGL10.EGL_NO_SURFACE;
   }

   @Override
   public int surfaceWidth() {
     final int widthArray[] = new int[1];
     eglConnection.getEgl().eglQuerySurface(
         eglConnection.getDisplay(), eglSurface, EGL10.EGL_WIDTH, widthArray);
     return widthArray[0];
   }

   @Override
   public int surfaceHeight() {
     final int heightArray[] = new int[1];
     eglConnection.getEgl().eglQuerySurface(
         eglConnection.getDisplay(), eglSurface, EGL10.EGL_HEIGHT, heightArray);
     return heightArray[0];
   }

   @Override
   public void releaseSurface() {
     if (eglSurface != EGL10.EGL_NO_SURFACE) {
       eglConnection.getEgl().eglDestroySurface(eglConnection.getDisplay(), eglSurface);
       eglSurface = EGL10.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 == EGL10.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 == EGL10.EGL_NO_SURFACE) {
       throw new RuntimeException("No EGLSurface - can't swap buffers");
     }
     synchronized (EglBase.lock) {
       eglConnection.getEgl().eglSwapBuffers(eglConnection.getDisplay(), eglSurface);
     }
   }

   @Override
   public void swapBuffers(long timeStampNs) {
     // Setting presentation time is not supported for EGL 1.0.
     swapBuffers();
   }

   // Return an EGLDisplay, or die trying.
   private static EGLDisplay getEglDisplay(EGL10 egl) {
     EGLDisplay eglDisplay = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
     if (eglDisplay == EGL10.EGL_NO_DISPLAY) {
       throw new GLException(egl.eglGetError(),
           "Unable to get EGL10 display: 0x" + Integer.toHexString(egl.eglGetError()));
     }
     int[] version = new int[2];
     if (!egl.eglInitialize(eglDisplay, version)) {
       throw new GLException(egl.eglGetError(),
           "Unable to initialize EGL10: 0x" + Integer.toHexString(egl.eglGetError()));
     }
     return eglDisplay;
   }

   // Return an EGLConfig, or die trying.
   private static EGLConfig getEglConfig(EGL10 egl, EGLDisplay eglDisplay, int[] configAttributes) {
     EGLConfig[] configs = new EGLConfig[1];
     int[] numConfigs = new int[1];
     if (!egl.eglChooseConfig(eglDisplay, configAttributes, configs, configs.length, numConfigs)) {
       throw new GLException(
           egl.eglGetError(), "eglChooseConfig failed: 0x" + Integer.toHexString(egl.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(EGL10 egl, @Nullable EGLContext sharedContext,
       EGLDisplay eglDisplay, EGLConfig eglConfig, int openGlesVersion) {
     if (sharedContext != null && sharedContext == EGL10.EGL_NO_CONTEXT) {
       throw new RuntimeException("Invalid sharedContext");
     }
     int[] contextAttributes = {EGL_CONTEXT_CLIENT_VERSION, openGlesVersion, EGL10.EGL_NONE};
     EGLContext rootContext = sharedContext == null ? EGL10.EGL_NO_CONTEXT : sharedContext;
     final EGLContext eglContext;
     synchronized (EglBase.lock) {
       eglContext = egl.eglCreateContext(eglDisplay, eglConfig, rootContext, contextAttributes);
     }
     if (eglContext == EGL10.EGL_NO_CONTEXT) {
       throw new GLException(egl.eglGetError(),
           "Failed to create EGL context: 0x" + Integer.toHexString(egl.eglGetError()));
     }
     return eglContext;
   }

   private static native long nativeGetCurrentNativeEGLContext();
 }
	/*
	* 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.Canvas;
	import android.graphics.Rect;
	import android.graphics.SurfaceTexture;
	import android.opengl.GLException;
	import android.view.Surface;
	import android.view.SurfaceHolder;
	import androidx.annotation.Nullable;
	import javax.microedition.khronos.egl.EGL10;
	import javax.microedition.khronos.egl.EGLConfig;
	import javax.microedition.khronos.egl.EGLContext;
	import javax.microedition.khronos.egl.EGLDisplay;
	import javax.microedition.khronos.egl.EGLSurface;

	/**
	* Holds EGL state and utility methods for handling an egl 1.0 EGLContext, an EGLDisplay,
	* and an EGLSurface.
	*/
	class EglBase10Impl implements EglBase10 {
	private static final String TAG = "EglBase10Impl";
	// This constant is taken from EGL14.EGL_CONTEXT_CLIENT_VERSION.
	private static final int EGL_CONTEXT_CLIENT_VERSION = 0x3098;

	private static final EglConnection EGL_NO_CONNECTION = new EglConnection();

	private EGLSurface eglSurface = EGL10.EGL_NO_SURFACE;
	private EglConnection eglConnection;

	// EGL wrapper for an actual EGLContext.
	private static class Context implements EglBase10.Context {
	private final EGL10 egl;
	private final EGLContext eglContext;
	private final EGLConfig eglContextConfig;

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

	@Override
	public long getNativeEglContext() {
	EGLContext previousContext = egl.eglGetCurrentContext();
	EGLDisplay currentDisplay = egl.eglGetCurrentDisplay();
	EGLSurface previousDrawSurface = egl.eglGetCurrentSurface(EGL10.EGL_DRAW);
	EGLSurface previousReadSurface = egl.eglGetCurrentSurface(EGL10.EGL_READ);
	EGLSurface tempEglSurface = null;

	if (currentDisplay == EGL10.EGL_NO_DISPLAY) {
	currentDisplay = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
	}

	try {
	if (previousContext != eglContext) {
	int[] surfaceAttribs = {EGL10.EGL_WIDTH, 1, EGL10.EGL_HEIGHT, 1, EGL10.EGL_NONE};
	tempEglSurface =
	egl.eglCreatePbufferSurface(currentDisplay, eglContextConfig, surfaceAttribs);
	if (!egl.eglMakeCurrent(currentDisplay, tempEglSurface, tempEglSurface, eglContext)) {
	throw new GLException(egl.eglGetError(),
	"Failed to make temporary EGL surface active: " + egl.eglGetError());
	}
	}

	return nativeGetCurrentNativeEGLContext();
	} finally {
	if (tempEglSurface != null) {
	egl.eglMakeCurrent(
	currentDisplay, previousDrawSurface, previousReadSurface, previousContext);
	egl.eglDestroySurface(currentDisplay, tempEglSurface);
	}
	}
	}

	public Context(EGL10 egl, EGLContext eglContext, EGLConfig eglContextConfig) {
	this.egl = egl;
	this.eglContext = eglContext;
	this.eglContextConfig = eglContextConfig;
	}
	}

	public static class EglConnection implements EglBase10.EglConnection {
	private final EGL10 egl;
	private final EGLContext eglContext;
	private final EGLDisplay eglDisplay;
	private final EGLConfig eglConfig;
	private final RefCountDelegate refCountDelegate;
	private EGLSurface currentSurface = EGL10.EGL_NO_SURFACE;

	public EglConnection(EGLContext sharedContext, int[] configAttributes) {
	egl = (EGL10) EGLContext.getEGL();
	eglDisplay = getEglDisplay(egl);
	eglConfig = getEglConfig(egl, eglDisplay, configAttributes);
	final int openGlesVersion = EglBase.getOpenGlesVersionFromConfig(configAttributes);
	Logging.d(TAG, "Using OpenGL ES version " + openGlesVersion);
	eglContext = createEglContext(egl, sharedContext, eglDisplay, eglConfig, openGlesVersion);

	// Ref count delegate with release callback.
	refCountDelegate = new RefCountDelegate(() -> {
	synchronized (EglBase.lock) {
	egl.eglMakeCurrent(
	eglDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT);
	}
	egl.eglDestroyContext(eglDisplay, eglContext);
	egl.eglTerminate(eglDisplay);
	currentSurface = EGL10.EGL_NO_SURFACE;
	});
	}

	// Returns a "null" EglConnection. Useful to represent a released instance with default values.
	private EglConnection() {
	egl = (EGL10) EGLContext.getEGL();
	eglContext = EGL10.EGL_NO_CONTEXT;
	eglDisplay = EGL10.EGL_NO_DISPLAY;
	eglConfig = null;
	refCountDelegate = new RefCountDelegate(() -> {});
	}

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

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

	@Override
	public EGL10 getEgl() {
	return egl;
	}

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

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

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

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

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

	public void detachCurrent() {
	synchronized (EglBase.lock) {
	if (!egl.eglMakeCurrent(
	eglDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT)) {
	throw new GLException(egl.eglGetError(),
	"eglDetachCurrent failed: 0x" + Integer.toHexString(egl.eglGetError()));
	}
	}
	currentSurface = EGL10.EGL_NO_SURFACE;
	}
	}

	// Create a new context with the specified config type, sharing data with sharedContext.
	public EglBase10Impl(EGLContext sharedContext, int[] configAttributes) {
	this.eglConnection = new EglConnection(sharedContext, configAttributes);
	}

	public EglBase10Impl(EglConnection eglConnection) {
	this.eglConnection = eglConnection;
	this.eglConnection.retain();
	}

	@Override
	public void createSurface(Surface surface) {
	/**
	* We have to wrap Surface in a SurfaceHolder because for some reason eglCreateWindowSurface
	* couldn't actually take a Surface object until API 17. Older versions fortunately just call
	* SurfaceHolder.getSurface(), so we'll do that. No other methods are relevant.
	*/
	class FakeSurfaceHolder implements SurfaceHolder {
	private final Surface surface;

	FakeSurfaceHolder(Surface surface) {
	this.surface = surface;
	}

	@Override
	public void addCallback(Callback callback) {}

	@Override
	public void removeCallback(Callback callback) {}

	@Override
	public boolean isCreating() {
	return false;
	}

	@Deprecated
	@Override
	public void setType(int i) {}

	@Override
	public void setFixedSize(int i, int i2) {}

	@Override
	public void setSizeFromLayout() {}

	@Override
	public void setFormat(int i) {}

	@Override
	public void setKeepScreenOn(boolean b) {}

	@Nullable
	@Override
	public Canvas lockCanvas() {
	return null;
	}

	@Nullable
	@Override
	public Canvas lockCanvas(Rect rect) {
	return null;
	}

	@Override
	public void unlockCanvasAndPost(Canvas canvas) {}

	@Nullable
	@Override
	public Rect getSurfaceFrame() {
	return null;
	}

	@Override
	public Surface getSurface() {
	return surface;
	}
	}

	createSurfaceInternal(new FakeSurfaceHolder(surface));
	}

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

	// Create EGLSurface from either a SurfaceHolder or a SurfaceTexture.
	private void createSurfaceInternal(Object nativeWindow) {
	if (!(nativeWindow instanceof SurfaceHolder) && !(nativeWindow instanceof SurfaceTexture)) {
	throw new IllegalStateException("Input must be either a SurfaceHolder or SurfaceTexture");
	}
	checkIsNotReleased();
	if (eglSurface != EGL10.EGL_NO_SURFACE) {
	throw new RuntimeException("Already has an EGLSurface");
	}

	EGL10 egl = eglConnection.getEgl();
	int[] surfaceAttribs = {EGL10.EGL_NONE};
	eglSurface = egl.eglCreateWindowSurface(
	eglConnection.getDisplay(), eglConnection.getConfig(), nativeWindow, surfaceAttribs);
	if (eglSurface == EGL10.EGL_NO_SURFACE) {
	throw new GLException(egl.eglGetError(),
	"Failed to create window surface: 0x" + Integer.toHexString(egl.eglGetError()));
	}
	}

	// Create dummy 1x1 pixel buffer surface so the context can be made current.
	@Override
	public void createDummyPbufferSurface() {
	createPbufferSurface(1, 1);
	}

	@Override
	public void createPbufferSurface(int width, int height) {
	checkIsNotReleased();
	if (eglSurface != EGL10.EGL_NO_SURFACE) {
	throw new RuntimeException("Already has an EGLSurface");
	}
	EGL10 egl = eglConnection.getEgl();
	int[] surfaceAttribs = {EGL10.EGL_WIDTH, width, EGL10.EGL_HEIGHT, height, EGL10.EGL_NONE};
	eglSurface = egl.eglCreatePbufferSurface(
	eglConnection.getDisplay(), eglConnection.getConfig(), surfaceAttribs);
	if (eglSurface == EGL10.EGL_NO_SURFACE) {
	throw new GLException(egl.eglGetError(),
	"Failed to create pixel buffer surface with size " + width + "x" + height + ": 0x"
	+ Integer.toHexString(egl.eglGetError()));
	}
	}

	@Override
	public org.webrtc.EglBase.Context getEglBaseContext() {
	return new Context(
	eglConnection.getEgl(), eglConnection.getContext(), eglConnection.getConfig());
	}

	@Override
	public boolean hasSurface() {
	return eglSurface != EGL10.EGL_NO_SURFACE;
	}

	@Override
	public int surfaceWidth() {
	final int widthArray[] = new int[1];
	eglConnection.getEgl().eglQuerySurface(
	eglConnection.getDisplay(), eglSurface, EGL10.EGL_WIDTH, widthArray);
	return widthArray[0];
	}

	@Override
	public int surfaceHeight() {
	final int heightArray[] = new int[1];
	eglConnection.getEgl().eglQuerySurface(
	eglConnection.getDisplay(), eglSurface, EGL10.EGL_HEIGHT, heightArray);
	return heightArray[0];
	}

	@Override
	public void releaseSurface() {
	if (eglSurface != EGL10.EGL_NO_SURFACE) {
	eglConnection.getEgl().eglDestroySurface(eglConnection.getDisplay(), eglSurface);
	eglSurface = EGL10.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 == EGL10.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 == EGL10.EGL_NO_SURFACE) {
	throw new RuntimeException("No EGLSurface - can't swap buffers");
	}
	synchronized (EglBase.lock) {
	eglConnection.getEgl().eglSwapBuffers(eglConnection.getDisplay(), eglSurface);
	}
	}

	@Override
	public void swapBuffers(long timeStampNs) {
	// Setting presentation time is not supported for EGL 1.0.
	swapBuffers();
	}

	// Return an EGLDisplay, or die trying.
	private static EGLDisplay getEglDisplay(EGL10 egl) {
	EGLDisplay eglDisplay = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
	if (eglDisplay == EGL10.EGL_NO_DISPLAY) {
	throw new GLException(egl.eglGetError(),
	"Unable to get EGL10 display: 0x" + Integer.toHexString(egl.eglGetError()));
	}
	int[] version = new int[2];
	if (!egl.eglInitialize(eglDisplay, version)) {
	throw new GLException(egl.eglGetError(),
	"Unable to initialize EGL10: 0x" + Integer.toHexString(egl.eglGetError()));
	}
	return eglDisplay;
	}

	// Return an EGLConfig, or die trying.
	private static EGLConfig getEglConfig(EGL10 egl, EGLDisplay eglDisplay, int[] configAttributes) {
	EGLConfig[] configs = new EGLConfig[1];
	int[] numConfigs = new int[1];
	if (!egl.eglChooseConfig(eglDisplay, configAttributes, configs, configs.length, numConfigs)) {
	throw new GLException(
	egl.eglGetError(), "eglChooseConfig failed: 0x" + Integer.toHexString(egl.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(EGL10 egl, @Nullable EGLContext sharedContext,
	EGLDisplay eglDisplay, EGLConfig eglConfig, int openGlesVersion) {
	if (sharedContext != null && sharedContext == EGL10.EGL_NO_CONTEXT) {
	throw new RuntimeException("Invalid sharedContext");
	}
	int[] contextAttributes = {EGL_CONTEXT_CLIENT_VERSION, openGlesVersion, EGL10.EGL_NONE};
	EGLContext rootContext = sharedContext == null ? EGL10.EGL_NO_CONTEXT : sharedContext;
	final EGLContext eglContext;
	synchronized (EglBase.lock) {
	eglContext = egl.eglCreateContext(eglDisplay, eglConfig, rootContext, contextAttributes);
	}
	if (eglContext == EGL10.EGL_NO_CONTEXT) {
	throw new GLException(egl.eglGetError(),
	"Failed to create EGL context: 0x" + Integer.toHexString(egl.eglGetError()));
	}
	return eglContext;
	}

	private static native long nativeGetCurrentNativeEGLContext();
	}