content: /*
   * Copyright (C) 2011-2014 GUIGUI Simon, fyhertz@gmail.com
   * 
   * This file is part of libstreaming (https://github.com/fyhertz/libstreaming)
   * 
   * Spydroid is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 3 of the License, or
   * (at your option) any later version.
   * 
   * This source code is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   * 
   * You should have received a copy of the GNU General Public License
   * along with this source code; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  /*
   * Based on the work of fadden
   * 
   * Copyright 2012 Google Inc. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package net.majorkernelpanic.streaming.gl;
  
  import android.annotation.SuppressLint;
  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.GLES20;
  import android.view.Surface;
  
  @SuppressLint("NewApi")
  public class SurfaceManager {
  
  	public final static String TAG = "TextureManager";
  
  	private static final int EGL_RECORDABLE_ANDROID = 0x3142;
  
  	private EGLContext mEGLContext = null;
  	private EGLContext mEGLSharedContext = null;
  	private EGLSurface mEGLSurface = null;
  	private EGLDisplay mEGLDisplay = null;
  
  	private Surface mSurface;
  
  	/**
  	 * Creates an EGL context and an EGL surface.
  	 */
  	public SurfaceManager(Surface surface, SurfaceManager manager) {
  		mSurface = surface;
  		mEGLSharedContext = manager.mEGLContext;
  		eglSetup();
  	}
  
  	/**
  	 * Creates an EGL context and an EGL surface.
  	 */
  	public SurfaceManager(Surface surface) {
  		mSurface = surface;
  		eglSetup();
  	}
  
  	public void makeCurrent() {
  		if (!EGL14.eglMakeCurrent(mEGLDisplay, mEGLSurface, mEGLSurface, mEGLContext))
  			throw new RuntimeException("eglMakeCurrent failed");
  	}
  
  	public void swapBuffer() {
  		EGL14.eglSwapBuffers(mEGLDisplay, mEGLSurface);
  	}
  
  	/**
  	 * Sends the presentation time stamp to EGL.  Time is expressed in nanoseconds.
  	 */
  	public void setPresentationTime(long nsecs) {
  		EGLExt.eglPresentationTimeANDROID(mEGLDisplay, mEGLSurface, nsecs);
  		checkEglError("eglPresentationTimeANDROID");
  	}
  
  	/**
  	 * Prepares EGL.  We want a GLES 2.0 context and a surface that supports recording.
  	 */
  	private void eglSetup() {
  		mEGLDisplay = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
  		if (mEGLDisplay == EGL14.EGL_NO_DISPLAY) {
  			throw new RuntimeException("unable to get EGL14 display");
  		}
  		int[] version = new int[2];
  		if (!EGL14.eglInitialize(mEGLDisplay, version, 0, version, 1)) {
  			throw new RuntimeException("unable to initialize EGL14");
  		}
  
  		// Configure EGL for recording and OpenGL ES 2.0.
  		int[] attribList;
  		if (mEGLSharedContext == null) {
  			attribList = new int[] {
  					EGL14.EGL_RED_SIZE, 8,
  					EGL14.EGL_GREEN_SIZE, 8,
  					EGL14.EGL_BLUE_SIZE, 8,
  					EGL14.EGL_RENDERABLE_TYPE, EGL14.EGL_OPENGL_ES2_BIT,
  					EGL14.EGL_NONE
  			};
  		} else {
  			attribList = new int[] {
  					EGL14.EGL_RED_SIZE, 8,
  					EGL14.EGL_GREEN_SIZE, 8,
  					EGL14.EGL_BLUE_SIZE, 8,
  					EGL14.EGL_RENDERABLE_TYPE, EGL14.EGL_OPENGL_ES2_BIT,
  					EGL_RECORDABLE_ANDROID, 1,
  					EGL14.EGL_NONE
  			};	
  		}
  		EGLConfig[] configs = new EGLConfig[1];
  		int[] numConfigs = new int[1];
  		EGL14.eglChooseConfig(mEGLDisplay, attribList, 0, configs, 0, configs.length,
  				numConfigs, 0);
  		checkEglError("eglCreateContext RGB888+recordable ES2");
  
  		// Configure context for OpenGL ES 2.0.
  		int[] attrib_list = {
  				EGL14.EGL_CONTEXT_CLIENT_VERSION, 2,
  				EGL14.EGL_NONE
  		};
  
  		if (mEGLSharedContext == null) {
  			mEGLContext = EGL14.eglCreateContext(mEGLDisplay, configs[0], EGL14.EGL_NO_CONTEXT, attrib_list, 0);
  		} else {
  			mEGLContext = EGL14.eglCreateContext(mEGLDisplay, configs[0], mEGLSharedContext, attrib_list, 0);
  		}
  		checkEglError("eglCreateContext");
  
  		// Create a window surface, and attach it to the Surface we received.
  		int[] surfaceAttribs = {
  				EGL14.EGL_NONE
  		};
  		mEGLSurface = EGL14.eglCreateWindowSurface(mEGLDisplay, configs[0], mSurface,
  				surfaceAttribs, 0);
  		checkEglError("eglCreateWindowSurface");
  
          GLES20.glDisable(GLES20.GL_DEPTH_TEST);
          GLES20.glDisable(GLES20.GL_CULL_FACE);
  		
  	}
  
  	/**
  	 * Discards all resources held by this class, notably the EGL context.  Also releases the
  	 * Surface that was passed to our constructor.
  	 */
  	public void release() {
  		if (mEGLDisplay != EGL14.EGL_NO_DISPLAY) {
  			EGL14.eglMakeCurrent(mEGLDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE,
  					EGL14.EGL_NO_CONTEXT);
  			EGL14.eglDestroySurface(mEGLDisplay, mEGLSurface);
  			EGL14.eglDestroyContext(mEGLDisplay, mEGLContext);
  			EGL14.eglReleaseThread();
  			EGL14.eglTerminate(mEGLDisplay);
  		}
  		mEGLDisplay = EGL14.EGL_NO_DISPLAY;
  		mEGLContext = EGL14.EGL_NO_CONTEXT;
  		mEGLSurface = EGL14.EGL_NO_SURFACE;
  		mSurface.release();
  	}
  
  	/**
  	 * Checks for EGL errors. Throws an exception if one is found.
  	 */
  	private void checkEglError(String msg) {
  		int error;
  		if ((error = EGL14.eglGetError()) != EGL14.EGL_SUCCESS) {
  			throw new RuntimeException(msg + ": EGL error: 0x" + Integer.toHexString(error));
  		}
  	}
  
  
  
  
  }
  