tests/HwAccelerationTest/src/com/android/test/hwui/GLDepthTestActivity.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2014 The Android Open Source Project
  *
  * 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 com.android.test.hwui;

 import android.app.Activity;
 import android.app.ActivityManager;
 import android.content.Context;
 import android.content.pm.ConfigurationInfo;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.opengl.EGL14;
 import android.opengl.EGLDisplay;
 import android.opengl.GLES20;
 import android.opengl.GLSurfaceView;
 import android.opengl.GLUtils;
 import android.opengl.Matrix;
 import android.os.Bundle;
 import android.os.SystemClock;
 import android.util.Log;
 import android.view.MotionEvent;

 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.nio.FloatBuffer;

 import javax.microedition.khronos.egl.EGLConfig;
 import javax.microedition.khronos.opengles.GL10;

 /**
  * This sample shows how to check for OpenGL ES 2.0 support at runtime, and then
  * use either OpenGL ES 1.0 or OpenGL ES 2.0, as appropriate.
  */
 public class GLDepthTestActivity extends Activity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         mGLSurfaceView = new GLSurfaceView(this);
         if (detectOpenGLES20()) {
             // Tell the surface view we want to create an OpenGL ES
             // 2.0-compatible
             // context, and set an OpenGL ES 2.0-compatible renderer.
             mGLSurfaceView.setEGLContextClientVersion(2);
             mRenderer = new GLES20TriangleRenderer(this);
             mGLSurfaceView.setRenderer(mRenderer);
         } else {
             throw new IllegalStateException("Can't find OGL ES2.0 context");
         }
         setContentView(mGLSurfaceView);
     }

     private boolean detectOpenGLES20() {
         ActivityManager am =
                 (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
         ConfigurationInfo info = am.getDeviceConfigurationInfo();
         return (info.reqGlEsVersion >= 0x20000);
     }

     @Override
     protected void onResume() {
         // Ideally a game should implement onResume() and onPause()
         // to take appropriate action when the activity looses focus
         super.onResume();
         mGLSurfaceView.onResume();
     }

     @Override
     protected void onPause() {
         // Ideally a game should implement onResume() and onPause()
         // to take appropriate action when the activity looses focus
         super.onPause();
         mGLSurfaceView.onPause();
     }

     @Override
     public boolean onTouchEvent(MotionEvent event) {
         Log.i("motion", event.toString());
         if (event.getActionMasked() ==  MotionEvent.ACTION_DOWN) {
             mRenderer.toggleDepthTest();
         }
         return true;
     }

     private GLSurfaceView mGLSurfaceView;
     private GLES20TriangleRenderer mRenderer;

     /*
      * Copyright (C) 2009 The Android Open Source Project 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.
      */

     class GLES20TriangleRenderer implements GLSurfaceView.Renderer {
         private final static int REPEAT_RECTANGLES = 10;
         private boolean mDepthTestEnabled = true;
         private final static int FRAME_REPEAT_TIMES = 1;
         public GLES20TriangleRenderer(Context context) {
             mContext = context;
             mTriangleVertices = ByteBuffer.allocateDirect(mTriangleVerticesData.length
                     * FLOAT_SIZE_BYTES).order(ByteOrder.nativeOrder()).asFloatBuffer();
             mTriangleVertices.put(mTriangleVerticesData).position(0);
         }


         public void toggleDepthTest() {
             mDepthTestEnabled = !mDepthTestEnabled;
             Log.v(TAG, "mDepthTestEnabled is " + mDepthTestEnabled);
         }

         public void onDrawFrame(GL10 glUnused) {
             for (int j = 0 ; j < FRAME_REPEAT_TIMES; j ++) {
                 // Ignore the passed-in GL10 interface, and use the GLES20
                 // class's static methods instead.
                 GLES20.glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
                 if (mDepthTestEnabled) {
                     GLES20.glClear(GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);
                 } else {
                     GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
                 }
                 GLES20.glUseProgram(mProgram);
                 if (mDepthTestEnabled) {
                     GLES20.glEnable(GLES20.GL_DEPTH_TEST);
                 } else {
                     GLES20.glDisable(GLES20.GL_DEPTH_TEST);
                 }
                 checkGlError("glUseProgram");

                 GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
                 GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureID);

                 mTriangleVertices.position(TRIANGLE_VERTICES_DATA_POS_OFFSET);
                 GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false,
                         TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
                 checkGlError("glVertexAttribPointer maPosition");
                 mTriangleVertices.position(TRIANGLE_VERTICES_DATA_UV_OFFSET);
                 GLES20.glEnableVertexAttribArray(maPositionHandle);
                 checkGlError("glEnableVertexAttribArray maPositionHandle");
                 GLES20.glVertexAttribPointer(maTextureHandle, 2, GLES20.GL_FLOAT, false,
                         TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
                 checkGlError("glVertexAttribPointer maTextureHandle");
                 GLES20.glEnableVertexAttribArray(maTextureHandle);
                 checkGlError("glEnableVertexAttribArray maTextureHandle");

                 for (int i = 0 ; i < REPEAT_RECTANGLES; i ++) {
                     float step = ((float)i) / REPEAT_RECTANGLES;
                     Matrix.setIdentityM(mMMatrix, 0);
                     Matrix.translateM(mMMatrix, 0, 0, step, step / 2);
                     Matrix.scaleM(mMMatrix, 0, 2.0f, 1.0f, 1.0f);
                     Matrix.multiplyMM(mMVPMatrix, 0, mVMatrix, 0, mMMatrix, 0);
                     Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mMVPMatrix, 0);

                     GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);
                     GLES20.glUniform4f(muOverlayHandle, step , step, step , step);
                     GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
                     checkGlError("glDrawArrays");
                 }
             }
         }

         public void onSurfaceChanged(GL10 glUnused, int width, int height) {
             // Ignore the passed-in GL10 interface, and use the GLES20
             // class's static methods instead.
             GLES20.glViewport(0, 0, width, height);
             float ratio = (float) width / height;
             Matrix.frustumM(mProjMatrix, 0, -ratio, ratio, -1, 1, 3, 7);
         }

         public void onSurfaceCreated(GL10 glUnused, EGLConfig config) {
             // Ignore the passed-in GL10 interface, and use the GLES20
             // class's static methods instead.
             mProgram = createProgram(mVertexShader, mFragmentShader);
             if (mProgram == 0) {
                 return;
             }
             maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
             checkGlError("glGetAttribLocation aPosition");
             if (maPositionHandle == -1) {
                 throw new RuntimeException("Could not get attrib location for aPosition");
             }
             maTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTextureCoord");
             checkGlError("glGetAttribLocation aTextureCoord");
             if (maTextureHandle == -1) {
                 throw new RuntimeException("Could not get attrib location for aTextureCoord");
             }

             muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
             checkGlError("glGetUniformLocation uMVPMatrix");
             if (muMVPMatrixHandle == -1) {
                 throw new RuntimeException("Could not get attrib location for uMVPMatrix");
             }

             muOverlayHandle = GLES20.glGetUniformLocation(mProgram, "uOverlay");
             checkGlError("glGetUniformLocation uOverlay");
             if (muOverlayHandle == -1) {
                 throw new RuntimeException("Could not get attrib location for muOverlayHandle");
             }

             /*
              * Create our texture. This has to be done each time the surface is
              * created.
              */

             int[] textures = new int[1];
             GLES20.glGenTextures(1, textures, 0);

             mTextureID = textures[0];
             GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureID);

             GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER,
                     GLES20.GL_NEAREST);
             GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
                     GLES20.GL_TEXTURE_MAG_FILTER,
                     GLES20.GL_LINEAR);

             GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S,
                     GLES20.GL_REPEAT);
             GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T,
                     GLES20.GL_REPEAT);

             InputStream is = mContext.getResources()
                     .openRawResource(R.drawable.robot);
             Bitmap bitmap;
             try {
                 bitmap = BitmapFactory.decodeStream(is);
             } finally {
                 try {
                     is.close();
                 } catch (IOException e) {
                     // Ignore.
                 }
             }

             GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
             bitmap.recycle();

             Matrix.setLookAtM(mVMatrix, 0, 0, 0, -5, 0f, 0f, 0f, 0f, 1.0f, 0.0f);

             EGLDisplay display = EGL14.eglGetCurrentDisplay();
             EGL14.eglSwapInterval(display, 0);

         }

         private int loadShader(int shaderType, String source) {
             int shader = GLES20.glCreateShader(shaderType);
             if (shader != 0) {
                 GLES20.glShaderSource(shader, source);
                 GLES20.glCompileShader(shader);
                 int[] compiled = new int[1];
                 GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
                 if (compiled[0] == 0) {
                     Log.e(TAG, "Could not compile shader " + shaderType + ":");
                     Log.e(TAG, GLES20.glGetShaderInfoLog(shader));
                     GLES20.glDeleteShader(shader);
                     shader = 0;
                 }
             }
             return shader;
         }

         private int createProgram(String vertexSource, String fragmentSource) {
             int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
             if (vertexShader == 0) {
                 return 0;
             }

             int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
             if (pixelShader == 0) {
                 return 0;
             }

             int program = GLES20.glCreateProgram();
             if (program != 0) {
                 GLES20.glAttachShader(program, vertexShader);
                 checkGlError("glAttachShader");
                 GLES20.glAttachShader(program, pixelShader);
                 checkGlError("glAttachShader");
                 GLES20.glLinkProgram(program);
                 int[] linkStatus = new int[1];
                 GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
                 if (linkStatus[0] != GLES20.GL_TRUE) {
                     Log.e(TAG, "Could not link program: ");
                     Log.e(TAG, GLES20.glGetProgramInfoLog(program));
                     GLES20.glDeleteProgram(program);
                     program = 0;
                 }
             }
             return program;
         }

         private void checkGlError(String op) {
             int error;
             while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
                 Log.e(TAG, op + ": glError " + error);
                 throw new RuntimeException(op + ": glError " + error);
             }
         }

         private static final int FLOAT_SIZE_BYTES = 4;
         private static final int TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES;
         private static final int TRIANGLE_VERTICES_DATA_POS_OFFSET = 0;
         private static final int TRIANGLE_VERTICES_DATA_UV_OFFSET = 3;
         private final float[] mTriangleVerticesData = {
                                 // X, Y, Z, U, V
                 -1.0f, -1.0f, 0, 0.0f, 0.0f,
                 -1.0f, 1.0f, 0, 0.0f, 1.0f,
                 1.0f, -1.0f, 0, 1.0f, 0.0f,
                 1.0f, 1.0f, 0, 1.0f, 1.0f, };

         private FloatBuffer mTriangleVertices;

         private final String mVertexShader =
                 "uniform mat4 uMVPMatrix;\n" +
                         "attribute vec4 aPosition;\n" +
                         "attribute vec2 aTextureCoord;\n" +
                         "varying vec2 vTextureCoord;\n" +
                         "void main() {\n" +
                         "  gl_Position = uMVPMatrix * aPosition;\n" +
                         "  vTextureCoord = aTextureCoord;\n" +
                         "}\n";

         private final String mFragmentShader =
                 "precision mediump float;\n" +
                         "varying vec2 vTextureCoord;\n" +
                         "uniform sampler2D sTexture;\n" +
                         "uniform vec4 uOverlay;\n" +
                         "void main() {\n" +
                         "  gl_FragColor = texture2D(sTexture, vTextureCoord) * uOverlay;\n" +
                         "}\n";

         private float[] mMVPMatrix = new float[16];
         private float[] mProjMatrix = new float[16];
         private float[] mMMatrix = new float[16];
         private float[] mVMatrix = new float[16];

         private int mProgram;
         private int mTextureID;
         private int muMVPMatrixHandle;
         private int maPositionHandle;
         private int maTextureHandle;
         private int muOverlayHandle;

         private Context mContext;
         private static final String TAG = "GLES20TriangleRenderer";
     }

 }
	/*
	* Copyright (C) 2014 The Android Open Source Project
	*
	* 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 com.android.test.hwui;

	import android.app.Activity;
	import android.app.ActivityManager;
	import android.content.Context;
	import android.content.pm.ConfigurationInfo;
	import android.graphics.Bitmap;
	import android.graphics.BitmapFactory;
	import android.opengl.EGL14;
	import android.opengl.EGLDisplay;
	import android.opengl.GLES20;
	import android.opengl.GLSurfaceView;
	import android.opengl.GLUtils;
	import android.opengl.Matrix;
	import android.os.Bundle;
	import android.os.SystemClock;
	import android.util.Log;
	import android.view.MotionEvent;

	import java.io.IOException;
	import java.io.InputStream;
	import java.nio.ByteBuffer;
	import java.nio.ByteOrder;
	import java.nio.FloatBuffer;

	import javax.microedition.khronos.egl.EGLConfig;
	import javax.microedition.khronos.opengles.GL10;

	/**
	* This sample shows how to check for OpenGL ES 2.0 support at runtime, and then
	* use either OpenGL ES 1.0 or OpenGL ES 2.0, as appropriate.
	*/
	public class GLDepthTestActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	mGLSurfaceView = new GLSurfaceView(this);
	if (detectOpenGLES20()) {
	// Tell the surface view we want to create an OpenGL ES
	// 2.0-compatible
	// context, and set an OpenGL ES 2.0-compatible renderer.
	mGLSurfaceView.setEGLContextClientVersion(2);
	mRenderer = new GLES20TriangleRenderer(this);
	mGLSurfaceView.setRenderer(mRenderer);
	} else {
	throw new IllegalStateException("Can't find OGL ES2.0 context");
	}
	setContentView(mGLSurfaceView);
	}

	private boolean detectOpenGLES20() {
	ActivityManager am =
	(ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
	ConfigurationInfo info = am.getDeviceConfigurationInfo();
	return (info.reqGlEsVersion >= 0x20000);
	}

	@Override
	protected void onResume() {
	// Ideally a game should implement onResume() and onPause()
	// to take appropriate action when the activity looses focus
	super.onResume();
	mGLSurfaceView.onResume();
	}

	@Override
	protected void onPause() {
	// Ideally a game should implement onResume() and onPause()
	// to take appropriate action when the activity looses focus
	super.onPause();
	mGLSurfaceView.onPause();
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
	Log.i("motion", event.toString());
	if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
	mRenderer.toggleDepthTest();
	}
	return true;
	}

	private GLSurfaceView mGLSurfaceView;
	private GLES20TriangleRenderer mRenderer;

	/*
	* Copyright (C) 2009 The Android Open Source Project 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.
	*/

	class GLES20TriangleRenderer implements GLSurfaceView.Renderer {
	private final static int REPEAT_RECTANGLES = 10;
	private boolean mDepthTestEnabled = true;
	private final static int FRAME_REPEAT_TIMES = 1;
	public GLES20TriangleRenderer(Context context) {
	mContext = context;
	mTriangleVertices = ByteBuffer.allocateDirect(mTriangleVerticesData.length
	* FLOAT_SIZE_BYTES).order(ByteOrder.nativeOrder()).asFloatBuffer();
	mTriangleVertices.put(mTriangleVerticesData).position(0);
	}


	public void toggleDepthTest() {
	mDepthTestEnabled = !mDepthTestEnabled;
	Log.v(TAG, "mDepthTestEnabled is " + mDepthTestEnabled);
	}

	public void onDrawFrame(GL10 glUnused) {
	for (int j = 0 ; j < FRAME_REPEAT_TIMES; j ++) {
	// Ignore the passed-in GL10 interface, and use the GLES20
	// class's static methods instead.
	GLES20.glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
	if (mDepthTestEnabled) {
	GLES20.glClear(GLES20.GL_DEPTH_BUFFER_BIT \| GLES20.GL_COLOR_BUFFER_BIT);
	} else {
	GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
	}
	GLES20.glUseProgram(mProgram);
	if (mDepthTestEnabled) {
	GLES20.glEnable(GLES20.GL_DEPTH_TEST);
	} else {
	GLES20.glDisable(GLES20.GL_DEPTH_TEST);
	}
	checkGlError("glUseProgram");

	GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
	GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureID);

	mTriangleVertices.position(TRIANGLE_VERTICES_DATA_POS_OFFSET);
	GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false,
	TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
	checkGlError("glVertexAttribPointer maPosition");
	mTriangleVertices.position(TRIANGLE_VERTICES_DATA_UV_OFFSET);
	GLES20.glEnableVertexAttribArray(maPositionHandle);
	checkGlError("glEnableVertexAttribArray maPositionHandle");
	GLES20.glVertexAttribPointer(maTextureHandle, 2, GLES20.GL_FLOAT, false,
	TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
	checkGlError("glVertexAttribPointer maTextureHandle");
	GLES20.glEnableVertexAttribArray(maTextureHandle);
	checkGlError("glEnableVertexAttribArray maTextureHandle");

	for (int i = 0 ; i < REPEAT_RECTANGLES; i ++) {
	float step = ((float)i) / REPEAT_RECTANGLES;
	Matrix.setIdentityM(mMMatrix, 0);
	Matrix.translateM(mMMatrix, 0, 0, step, step / 2);
	Matrix.scaleM(mMMatrix, 0, 2.0f, 1.0f, 1.0f);
	Matrix.multiplyMM(mMVPMatrix, 0, mVMatrix, 0, mMMatrix, 0);
	Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mMVPMatrix, 0);

	GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);
	GLES20.glUniform4f(muOverlayHandle, step , step, step , step);
	GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
	checkGlError("glDrawArrays");
	}
	}
	}

	public void onSurfaceChanged(GL10 glUnused, int width, int height) {
	// Ignore the passed-in GL10 interface, and use the GLES20
	// class's static methods instead.
	GLES20.glViewport(0, 0, width, height);
	float ratio = (float) width / height;
	Matrix.frustumM(mProjMatrix, 0, -ratio, ratio, -1, 1, 3, 7);
	}

	public void onSurfaceCreated(GL10 glUnused, EGLConfig config) {
	// Ignore the passed-in GL10 interface, and use the GLES20
	// class's static methods instead.
	mProgram = createProgram(mVertexShader, mFragmentShader);
	if (mProgram == 0) {
	return;
	}
	maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
	checkGlError("glGetAttribLocation aPosition");
	if (maPositionHandle == -1) {
	throw new RuntimeException("Could not get attrib location for aPosition");
	}
	maTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTextureCoord");
	checkGlError("glGetAttribLocation aTextureCoord");
	if (maTextureHandle == -1) {
	throw new RuntimeException("Could not get attrib location for aTextureCoord");
	}

	muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
	checkGlError("glGetUniformLocation uMVPMatrix");
	if (muMVPMatrixHandle == -1) {
	throw new RuntimeException("Could not get attrib location for uMVPMatrix");
	}

	muOverlayHandle = GLES20.glGetUniformLocation(mProgram, "uOverlay");
	checkGlError("glGetUniformLocation uOverlay");
	if (muOverlayHandle == -1) {
	throw new RuntimeException("Could not get attrib location for muOverlayHandle");
	}

	/*
	* Create our texture. This has to be done each time the surface is
	* created.
	*/

	int[] textures = new int[1];
	GLES20.glGenTextures(1, textures, 0);

	mTextureID = textures[0];
	GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureID);

	GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER,
	GLES20.GL_NEAREST);
	GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
	GLES20.GL_TEXTURE_MAG_FILTER,
	GLES20.GL_LINEAR);

	GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S,
	GLES20.GL_REPEAT);
	GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T,
	GLES20.GL_REPEAT);

	InputStream is = mContext.getResources()
	.openRawResource(R.drawable.robot);
	Bitmap bitmap;
	try {
	bitmap = BitmapFactory.decodeStream(is);
	} finally {
	try {
	is.close();
	} catch (IOException e) {
	// Ignore.
	}
	}

	GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
	bitmap.recycle();

	Matrix.setLookAtM(mVMatrix, 0, 0, 0, -5, 0f, 0f, 0f, 0f, 1.0f, 0.0f);

	EGLDisplay display = EGL14.eglGetCurrentDisplay();
	EGL14.eglSwapInterval(display, 0);

	}

	private int loadShader(int shaderType, String source) {
	int shader = GLES20.glCreateShader(shaderType);
	if (shader != 0) {
	GLES20.glShaderSource(shader, source);
	GLES20.glCompileShader(shader);
	int[] compiled = new int[1];
	GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
	if (compiled[0] == 0) {
	Log.e(TAG, "Could not compile shader " + shaderType + ":");
	Log.e(TAG, GLES20.glGetShaderInfoLog(shader));
	GLES20.glDeleteShader(shader);
	shader = 0;
	}
	}
	return shader;
	}

	private int createProgram(String vertexSource, String fragmentSource) {
	int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
	if (vertexShader == 0) {
	return 0;
	}

	int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
	if (pixelShader == 0) {
	return 0;
	}

	int program = GLES20.glCreateProgram();
	if (program != 0) {
	GLES20.glAttachShader(program, vertexShader);
	checkGlError("glAttachShader");
	GLES20.glAttachShader(program, pixelShader);
	checkGlError("glAttachShader");
	GLES20.glLinkProgram(program);
	int[] linkStatus = new int[1];
	GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
	if (linkStatus[0] != GLES20.GL_TRUE) {
	Log.e(TAG, "Could not link program: ");
	Log.e(TAG, GLES20.glGetProgramInfoLog(program));
	GLES20.glDeleteProgram(program);
	program = 0;
	}
	}
	return program;
	}

	private void checkGlError(String op) {
	int error;
	while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
	Log.e(TAG, op + ": glError " + error);
	throw new RuntimeException(op + ": glError " + error);
	}
	}

	private static final int FLOAT_SIZE_BYTES = 4;
	private static final int TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES;
	private static final int TRIANGLE_VERTICES_DATA_POS_OFFSET = 0;
	private static final int TRIANGLE_VERTICES_DATA_UV_OFFSET = 3;
	private final float[] mTriangleVerticesData = {
	// X, Y, Z, U, V
	-1.0f, -1.0f, 0, 0.0f, 0.0f,
	-1.0f, 1.0f, 0, 0.0f, 1.0f,
	1.0f, -1.0f, 0, 1.0f, 0.0f,
	1.0f, 1.0f, 0, 1.0f, 1.0f, };

	private FloatBuffer mTriangleVertices;

	private final String mVertexShader =
	"uniform mat4 uMVPMatrix;\n" +
	"attribute vec4 aPosition;\n" +
	"attribute vec2 aTextureCoord;\n" +
	"varying vec2 vTextureCoord;\n" +
	"void main() {\n" +
	" gl_Position = uMVPMatrix * aPosition;\n" +
	" vTextureCoord = aTextureCoord;\n" +
	"}\n";

	private final String mFragmentShader =
	"precision mediump float;\n" +
	"varying vec2 vTextureCoord;\n" +
	"uniform sampler2D sTexture;\n" +
	"uniform vec4 uOverlay;\n" +
	"void main() {\n" +
	" gl_FragColor = texture2D(sTexture, vTextureCoord) * uOverlay;\n" +
	"}\n";

	private float[] mMVPMatrix = new float[16];
	private float[] mProjMatrix = new float[16];
	private float[] mMMatrix = new float[16];
	private float[] mVMatrix = new float[16];

	private int mProgram;
	private int mTextureID;
	private int muMVPMatrixHandle;
	private int maPositionHandle;
	private int maTextureHandle;
	private int muOverlayHandle;

	private Context mContext;
	private static final String TAG = "GLES20TriangleRenderer";
	}

	}