tests/src/android/opengl/cts/CompressedTextureSurfaceView.java - platform/cts - Git at Google

 /*
  * Copyright (C) 2011 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 android.opengl.cts;

 import java.io.IOException;
 import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.nio.FloatBuffer;
 import java.util.ArrayList;
 import java.util.HashMap;

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

 import com.android.cts.stub.R;

 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
 import android.graphics.Bitmap.Config;
 import android.graphics.BitmapFactory;
 import android.graphics.Color;
 import android.graphics.SurfaceTexture;
 import android.opengl.ETC1;
 import android.opengl.ETC1Util;
 import android.opengl.GLES20;
 import android.opengl.GLSurfaceView;
 import android.opengl.GLUtils;
 import android.opengl.Matrix;
 import android.util.Log;
 import android.view.Surface;

 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;

 class CompressedTextureSurfaceView extends GLSurfaceView {
     private static final String TAG = "CompressedTextureSurfaceView";
     private static final int SLEEP_TIME_MS = 1000;

     CompressedTextureRender mRenderer;

     public CompressedTextureSurfaceView(Context context,
                                         Bitmap base,
                                         CompressedTextureLoader.Texture compressed) {
         super(context);

         setEGLContextClientVersion(2);
         mRenderer = new CompressedTextureRender(context, base, compressed);
         setRenderer(mRenderer);
         setRenderMode(RENDERMODE_WHEN_DIRTY);
     }

     @Override
     public void onResume() {
         super.onResume();
     }

     public boolean getTestPassed() throws InterruptedException {
         return mRenderer.getTestPassed();
     }

     private static class CompressedTextureRender implements GLSurfaceView.Renderer {
         private static String TAG = "CompressedTextureRender";

         private static final int ALLOWED_DELTA = 25;
         private static final int FBO_PIXEL_SIZE_BYTES = 4;
         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.f, 0.f,
             1.0f, -1.0f, 0, 1.f, 0.f,
             -1.0f,  1.0f, 0, 0.f, 1.f,
             1.0f,  1.0f, 0, 1.f, 1.f,
         };

         private FloatBuffer mTriangleVertices;

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

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

         private float[] mMVPMatrix = new float[16];
         private float[] mSTMatrix = new float[16];

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

         private int mColorTargetID;
         private int mFrameBufferObjectID;

         private boolean updateSurface = false;

         private boolean mTestPassed;
         private CountDownLatch mDoneSignal;

         Bitmap mBaseTexture;
         CompressedTextureLoader.Texture mCompressedTexture;

         int mWidth;
         int mHeight;

         ByteBuffer mReadBackBuffer;

         boolean getTestPassed() throws InterruptedException {
             if (!mDoneSignal.await(2000L, TimeUnit.MILLISECONDS)) {
                 throw new IllegalStateException("Coudn't finish drawing frames!");
             }

             return mTestPassed;
         }

         public CompressedTextureRender(Context context,
                                        Bitmap base,
                                        CompressedTextureLoader.Texture compressed) {
             mBaseTexture = base;
             mCompressedTexture = compressed;
             mTriangleVertices = ByteBuffer.allocateDirect(
                 mTriangleVerticesData.length * FLOAT_SIZE_BYTES)
                     .order(ByteOrder.nativeOrder()).asFloatBuffer();
             mTriangleVertices.put(mTriangleVerticesData).position(0);

             Matrix.setIdentityM(mSTMatrix, 0);

             int byteBufferSize = mBaseTexture.getWidth() *
                                  mBaseTexture.getHeight() *
                                  FBO_PIXEL_SIZE_BYTES;
             mReadBackBuffer = ByteBuffer.allocateDirect(byteBufferSize);

             mDoneSignal = new CountDownLatch(1);
         }

         private void renderQuad(int textureID) {
             GLES20.glUseProgram(mProgram);
             checkGlError("glUseProgram");

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

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

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

             Matrix.setIdentityM(mMVPMatrix, 0);
             GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);

             GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
             checkGlError("glDrawArrays");
         }

         private int getUnsignedByte(byte val) {
             return 0xFF & ((int)val);
         }

         private boolean comparePixel(int x, int y) {
             int w = mBaseTexture.getWidth();
             int sampleStart = (y * w + x) * FBO_PIXEL_SIZE_BYTES;

             int R = getUnsignedByte(mReadBackBuffer.get(sampleStart));
             int G = getUnsignedByte(mReadBackBuffer.get(sampleStart + 1));
             int B = getUnsignedByte(mReadBackBuffer.get(sampleStart + 2));

             int original = mBaseTexture.getPixel(x, y);

             int deltaR = Math.abs(R - Color.red(original));
             int deltaG = Math.abs(G - Color.green(original));
             int deltaB = Math.abs(B - Color.blue(original));

             if (deltaR <= ALLOWED_DELTA &&
                 deltaG <= ALLOWED_DELTA &&
                 deltaB <= ALLOWED_DELTA) {
                 return true;
             }

             Log.i("PIXEL DELTA", "R: " + deltaR + " G: " + deltaG + " B: " + deltaB);

             return false;
         }

         private void comparePixels() {
             int w = mBaseTexture.getWidth();
             int h = mBaseTexture.getWidth();
             int wOver4 = w / 4;
             int hOver4 = h / 4;

             // Sample 4 points in the image. Test is designed so that
             // sample areas are low frequency and easy to compare
             boolean sample1Matches = comparePixel(wOver4, hOver4);
             boolean sample2Matches = comparePixel(wOver4 * 3, hOver4);
             boolean sample3Matches = comparePixel(wOver4, hOver4 * 3);
             boolean sample4Matches = comparePixel(wOver4 * 3, hOver4 * 3);

             mTestPassed = sample1Matches && sample2Matches && sample3Matches && sample4Matches;
             mDoneSignal.countDown();
         }

         public void onDrawFrame(GL10 glUnused) {
             if (mProgram == 0) {
                 return;
             }

             GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, mFrameBufferObjectID);
             GLES20.glViewport(0, 0, mBaseTexture.getWidth(), mBaseTexture.getHeight());
             GLES20.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
             renderQuad(mTextureID);
             GLES20.glReadPixels(0, 0, mBaseTexture.getWidth(), mBaseTexture.getHeight(),
                                 GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, mReadBackBuffer);
             comparePixels();
             GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);

             GLES20.glViewport(0, 0, mWidth, mHeight);
             GLES20.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
             GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);

             renderQuad(mColorTargetID);

             GLES20.glFinish();
         }

         public void onSurfaceChanged(GL10 glUnused, int width, int height) {
             mWidth = width;
             mHeight = height;
         }

         private void setupSamplers() {
             GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
                     GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
             GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
                     GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
             GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
                     GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
             GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
                     GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
         }

         private void initFBO() {
             int[] textures = new int[1];
             GLES20.glGenTextures(1, textures, 0);

             mColorTargetID = textures[0];
             GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mColorTargetID);
             checkGlError("glBindTexture mColorTargetID");
             setupSamplers();
             GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGBA,
                                 mBaseTexture.getWidth(), mBaseTexture.getHeight(), 0,
                                 GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, null);
             checkGlError("glTexImage2D mColorTargetID");

             GLES20.glGenFramebuffers(1, textures, 0);
             mFrameBufferObjectID = textures[0];
             GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, mFrameBufferObjectID);

             GLES20.glFramebufferTexture2D(GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0,
                                           GLES20.GL_TEXTURE_2D, mColorTargetID, 0);

             int status = GLES20.glCheckFramebufferStatus(GLES20.GL_FRAMEBUFFER);
             if(status != GLES20.GL_FRAMEBUFFER_COMPLETE) {
                 throw new RuntimeException("Failed to initialize framebuffer object");
             }

             GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
         }

         public void onSurfaceCreated(GL10 glUnused, EGLConfig config) {
             if (mCompressedTexture != null && !mCompressedTexture.isSupported()) {
                 mTestPassed = true;
                 mDoneSignal.countDown();
                 return;
             }

             initFBO();

             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");
             }

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

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

             if (mCompressedTexture == null) {
                 GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, mBaseTexture, 0);
                 checkGlError("texImage2D mBaseTexture");
             } else {
                 GLES20.glCompressedTexImage2D(GLES20.GL_TEXTURE_2D,
                                               0,
                                               mCompressedTexture.getFormat(),
                                               mCompressedTexture.getWidth(),
                                               mCompressedTexture.getHeight(),
                                               0,
                                               mCompressedTexture.getData().remaining(),
                                               mCompressedTexture.getData());
                 checkGlError("glCompressedTexImage2D mTextureID");
             }
         }

         synchronized public void onFrameAvailable(SurfaceTexture surface) {
             updateSurface = true;
         }

         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);
             }
         }

     }  // End of class CompressedTextureRender.

 }  // End of class CompressedTextureSurfaceView.
	/*
	* Copyright (C) 2011 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 android.opengl.cts;

	import java.io.IOException;
	import java.nio.Buffer;
	import java.nio.ByteBuffer;
	import java.nio.ByteOrder;
	import java.nio.FloatBuffer;
	import java.util.ArrayList;
	import java.util.HashMap;

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

	import com.android.cts.stub.R;

	import android.content.Context;
	import android.content.res.Resources;
	import android.graphics.Bitmap;
	import android.graphics.Bitmap.Config;
	import android.graphics.BitmapFactory;
	import android.graphics.Color;
	import android.graphics.SurfaceTexture;
	import android.opengl.ETC1;
	import android.opengl.ETC1Util;
	import android.opengl.GLES20;
	import android.opengl.GLSurfaceView;
	import android.opengl.GLUtils;
	import android.opengl.Matrix;
	import android.util.Log;
	import android.view.Surface;

	import java.util.concurrent.CountDownLatch;
	import java.util.concurrent.TimeUnit;

	class CompressedTextureSurfaceView extends GLSurfaceView {
	private static final String TAG = "CompressedTextureSurfaceView";
	private static final int SLEEP_TIME_MS = 1000;

	CompressedTextureRender mRenderer;

	public CompressedTextureSurfaceView(Context context,
	Bitmap base,
	CompressedTextureLoader.Texture compressed) {
	super(context);

	setEGLContextClientVersion(2);
	mRenderer = new CompressedTextureRender(context, base, compressed);
	setRenderer(mRenderer);
	setRenderMode(RENDERMODE_WHEN_DIRTY);
	}

	@Override
	public void onResume() {
	super.onResume();
	}

	public boolean getTestPassed() throws InterruptedException {
	return mRenderer.getTestPassed();
	}

	private static class CompressedTextureRender implements GLSurfaceView.Renderer {
	private static String TAG = "CompressedTextureRender";

	private static final int ALLOWED_DELTA = 25;
	private static final int FBO_PIXEL_SIZE_BYTES = 4;
	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.f, 0.f,
	1.0f, -1.0f, 0, 1.f, 0.f,
	-1.0f, 1.0f, 0, 0.f, 1.f,
	1.0f, 1.0f, 0, 1.f, 1.f,
	};

	private FloatBuffer mTriangleVertices;

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

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

	private float[] mMVPMatrix = new float[16];
	private float[] mSTMatrix = new float[16];

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

	private int mColorTargetID;
	private int mFrameBufferObjectID;

	private boolean updateSurface = false;

	private boolean mTestPassed;
	private CountDownLatch mDoneSignal;

	Bitmap mBaseTexture;
	CompressedTextureLoader.Texture mCompressedTexture;

	int mWidth;
	int mHeight;

	ByteBuffer mReadBackBuffer;

	boolean getTestPassed() throws InterruptedException {
	if (!mDoneSignal.await(2000L, TimeUnit.MILLISECONDS)) {
	throw new IllegalStateException("Coudn't finish drawing frames!");
	}

	return mTestPassed;
	}

	public CompressedTextureRender(Context context,
	Bitmap base,
	CompressedTextureLoader.Texture compressed) {
	mBaseTexture = base;
	mCompressedTexture = compressed;
	mTriangleVertices = ByteBuffer.allocateDirect(
	mTriangleVerticesData.length * FLOAT_SIZE_BYTES)
	.order(ByteOrder.nativeOrder()).asFloatBuffer();
	mTriangleVertices.put(mTriangleVerticesData).position(0);

	Matrix.setIdentityM(mSTMatrix, 0);

	int byteBufferSize = mBaseTexture.getWidth() *
	mBaseTexture.getHeight() *
	FBO_PIXEL_SIZE_BYTES;
	mReadBackBuffer = ByteBuffer.allocateDirect(byteBufferSize);

	mDoneSignal = new CountDownLatch(1);
	}

	private void renderQuad(int textureID) {
	GLES20.glUseProgram(mProgram);
	checkGlError("glUseProgram");

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

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

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

	Matrix.setIdentityM(mMVPMatrix, 0);
	GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);

	GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
	checkGlError("glDrawArrays");
	}

	private int getUnsignedByte(byte val) {
	return 0xFF & ((int)val);
	}

	private boolean comparePixel(int x, int y) {
	int w = mBaseTexture.getWidth();
	int sampleStart = (y * w + x) * FBO_PIXEL_SIZE_BYTES;

	int R = getUnsignedByte(mReadBackBuffer.get(sampleStart));
	int G = getUnsignedByte(mReadBackBuffer.get(sampleStart + 1));
	int B = getUnsignedByte(mReadBackBuffer.get(sampleStart + 2));

	int original = mBaseTexture.getPixel(x, y);

	int deltaR = Math.abs(R - Color.red(original));
	int deltaG = Math.abs(G - Color.green(original));
	int deltaB = Math.abs(B - Color.blue(original));

	if (deltaR <= ALLOWED_DELTA &&
	deltaG <= ALLOWED_DELTA &&
	deltaB <= ALLOWED_DELTA) {
	return true;
	}

	Log.i("PIXEL DELTA", "R: " + deltaR + " G: " + deltaG + " B: " + deltaB);

	return false;
	}

	private void comparePixels() {
	int w = mBaseTexture.getWidth();
	int h = mBaseTexture.getWidth();
	int wOver4 = w / 4;
	int hOver4 = h / 4;

	// Sample 4 points in the image. Test is designed so that
	// sample areas are low frequency and easy to compare
	boolean sample1Matches = comparePixel(wOver4, hOver4);
	boolean sample2Matches = comparePixel(wOver4 * 3, hOver4);
	boolean sample3Matches = comparePixel(wOver4, hOver4 * 3);
	boolean sample4Matches = comparePixel(wOver4 * 3, hOver4 * 3);

	mTestPassed = sample1Matches && sample2Matches && sample3Matches && sample4Matches;
	mDoneSignal.countDown();
	}

	public void onDrawFrame(GL10 glUnused) {
	if (mProgram == 0) {
	return;
	}

	GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, mFrameBufferObjectID);
	GLES20.glViewport(0, 0, mBaseTexture.getWidth(), mBaseTexture.getHeight());
	GLES20.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
	renderQuad(mTextureID);
	GLES20.glReadPixels(0, 0, mBaseTexture.getWidth(), mBaseTexture.getHeight(),
	GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, mReadBackBuffer);
	comparePixels();
	GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);

	GLES20.glViewport(0, 0, mWidth, mHeight);
	GLES20.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
	GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT \| GLES20.GL_COLOR_BUFFER_BIT);

	renderQuad(mColorTargetID);

	GLES20.glFinish();
	}

	public void onSurfaceChanged(GL10 glUnused, int width, int height) {
	mWidth = width;
	mHeight = height;
	}

	private void setupSamplers() {
	GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
	GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
	GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
	GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
	GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
	GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
	GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
	GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
	}

	private void initFBO() {
	int[] textures = new int[1];
	GLES20.glGenTextures(1, textures, 0);

	mColorTargetID = textures[0];
	GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mColorTargetID);
	checkGlError("glBindTexture mColorTargetID");
	setupSamplers();
	GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGBA,
	mBaseTexture.getWidth(), mBaseTexture.getHeight(), 0,
	GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, null);
	checkGlError("glTexImage2D mColorTargetID");

	GLES20.glGenFramebuffers(1, textures, 0);
	mFrameBufferObjectID = textures[0];
	GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, mFrameBufferObjectID);

	GLES20.glFramebufferTexture2D(GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0,
	GLES20.GL_TEXTURE_2D, mColorTargetID, 0);

	int status = GLES20.glCheckFramebufferStatus(GLES20.GL_FRAMEBUFFER);
	if(status != GLES20.GL_FRAMEBUFFER_COMPLETE) {
	throw new RuntimeException("Failed to initialize framebuffer object");
	}

	GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
	}

	public void onSurfaceCreated(GL10 glUnused, EGLConfig config) {
	if (mCompressedTexture != null && !mCompressedTexture.isSupported()) {
	mTestPassed = true;
	mDoneSignal.countDown();
	return;
	}

	initFBO();

	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");
	}

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

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

	if (mCompressedTexture == null) {
	GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, mBaseTexture, 0);
	checkGlError("texImage2D mBaseTexture");
	} else {
	GLES20.glCompressedTexImage2D(GLES20.GL_TEXTURE_2D,
	0,
	mCompressedTexture.getFormat(),
	mCompressedTexture.getWidth(),
	mCompressedTexture.getHeight(),
	0,
	mCompressedTexture.getData().remaining(),
	mCompressedTexture.getData());
	checkGlError("glCompressedTexImage2D mTextureID");
	}
	}

	synchronized public void onFrameAvailable(SurfaceTexture surface) {
	updateSurface = true;
	}

	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);
	}
	}

	} // End of class CompressedTextureRender.

	} // End of class CompressedTextureSurfaceView.