@Override
  public void onSurfaceCreated(GL10 glUnused, EGLConfig config) {
    GLES20.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);

    int vertexShaderHandle = GLES20.glCreateShader(GLES20.GL_VERTEX_SHADER);
    GLES20.glShaderSource(vertexShaderHandle, loadShader(R.raw.vertex_shader));
    GLES20.glCompileShader(vertexShaderHandle);
    int fragmentShaderHandle = GLES20.glCreateShader(GLES20.GL_FRAGMENT_SHADER);
    GLES20.glShaderSource(fragmentShaderHandle, loadShader(R.raw.fragment_shader));
    GLES20.glCompileShader(fragmentShaderHandle);
    int programHandle = GLES20.glCreateProgram();
    GLES20.glAttachShader(programHandle, vertexShaderHandle);
    GLES20.glAttachShader(programHandle, fragmentShaderHandle);
    GLES20.glLinkProgram(programHandle);
    GLES20.glUseProgram(programHandle);
    Object3D.init(programHandle);
    mLightPosHandle = GLES20.glGetUniformLocation(programHandle, "uLightPos");

    GLES20.glEnable(GLES20.GL_DEPTH_TEST);
    GLES20.glEnable(GLES20.GL_CULL_FACE);
    GLES20.glCullFace(GLES20.GL_BACK);

    //		GLES20.glEnable(GLES20.GL_BLEND);
    //		GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);

    mPrism.init();
    mCylinder.init();
    mSphere.init();
  }
  @Override
  public void onDrawFrame(GL10 glUnused) {
    GLES20.glClear(GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);

    Matrix.setIdentityM(mModelMatrix, 0);
    Matrix.rotateM(mModelMatrix, 0, 90, 1.0f, 0.0f, 0.0f);
    Matrix.multiplyMM(mMVMatrix, 0, mViewMatrix, 0, mModelMatrix, 0);
    Matrix.multiplyMM(mMVPMatrix, 0, mProjectionMatrix, 0, mMVMatrix, 0);
    mPrism.render(mMVPMatrix, mMVMatrix);
    mCylinder.render(mMVPMatrix, mMVMatrix);
    mSphere.render(mMVPMatrix, mMVMatrix);
  }
 public void release() {
   mSphere.release();
   mCylinder.release();
   mPrism.release();
   Object3D.releaseBuffer();
 }