android opengl 点击正方形的一个面给出相应事件

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android opengl 点击正方形的一个面给出相应事件0

用OpenGL做的可旋转的正方形，有6个面，现在想做点击其中一个面，让我知道点的是谁，如何做呢？

public class MyRender implements Renderer {
	public static float step = 15;
    boolean key;
    boolean light = true;
    
    public static float xrot, yrot;    //x,y轴旋转
    public static float xspeed, yspeed;//旋转的速度
    private int one = 0x10000;
    private int[] textures = new int[1];
    /**
     * @param context
     *            顶点及纹理
     */
    // verticesBuffer
    private IntBuffer verticesBuffer;
    // texcoordBuffer
    private IntBuffer texcoordBuffer;
    // 顶点数组vertices
    private int[] vertices;
    // 纹理数组texcoord
    private int[] texcoord;

    // 构造方法
    public MyRender() {
        // 在构造方法中初始化
        initData();
        initBuffer();
    }

    // 初始化各类值
    public void initData() {
        vertices = new int[] { -one, -one, one, one, -one, one, -one, one, one,
                one, one, one, one, -one, one, one, -one, -one, one, one, one,
                one, one, -one, one, -one, -one, -one, -one, -one, one, one,
                -one, -one, one, -one, -one, -one, -one, -one, -one, one, -one,
                one, -one, -one, one, one, -one, one, -one, one, one, -one,
                -one, one, one, one, one, one, -one, -one, -one, -one, -one,
                one, one, -one, -one, one, -one, one };

        texcoord = new int[] { 0, 0, one, 0, 0, one, one, one };
    }

    public void initBuffer() {
        // verticesbyteBuffer
        ByteBuffer verticesbyteBuffer = ByteBuffer
                .allocateDirect(vertices.length * 4);
        verticesbyteBuffer.order(ByteOrder.nativeOrder());
        verticesBuffer = verticesbyteBuffer.asIntBuffer();
        verticesBuffer.put(vertices);
        verticesBuffer.position(0);

        // texcoordBuffer
        ByteBuffer texcoordbyteBuffer = ByteBuffer
                .allocateDirect(texcoord.length * 4 * 6);
        texcoordbyteBuffer.order(ByteOrder.nativeOrder());
        texcoordBuffer = texcoordbyteBuffer.asIntBuffer();
        for (int i = 0; i < 6; i++) {
            texcoordBuffer.put(texcoord);
        }
        texcoordBuffer.position(0);
    }

    @Override
    public void onDrawFrame(GL10 gl) {

        // 清除深度缓存和颜色
        gl.glClear(GL10.GL_DEPTH_BUFFER_BIT | GL10.GL_COLOR_BUFFER_BIT);
        // 重置观察模型
        gl.glLoadIdentity();
        // 启用vertex及texcoord
        gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
        gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);

        // 向左移动1.5f并向里移动6.0f
        gl.glTranslatef(0.0f, 0.0f, -6.0f);
        
        //设置旋转
        gl.glRotatef(MainActivity5.anglex, 0, 1, 0);
        gl.glRotatef(MainActivity5.angley, 1, 0, 0);
        
        // 指定顶点映射
        gl.glVertexPointer(3, GL10.GL_FIXED, 0, verticesBuffer);
        // 指定纹理映射(每次都写错，烦)
        gl.glTexCoordPointer(2, GL10.GL_FIXED, 0, texcoordBuffer);

        for (int i = 0; i < 6; i++) {
        	switch(i){
	        	case 0:
	        		GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, BitGL.bitmapA, 0);
	        		break;
	        	case 1:
	        		GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, BitGL.bitmapB, 0);
	        		break;
	        	case 2:
	        		GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, BitGL.bitmapC, 0);
	        		break;
	        	case 3:
	        		GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, BitGL.bitmapD, 0);
	        		break;
	        	case 4:
	        		GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, BitGL.bitmapE, 0);
	        		break;
	        	case 5:
	        		GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, BitGL.bitmapF, 0);
	        		break;
        	}
        	gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, i * 4, 4);
        }

        // 取消顶点及纹理映射
        gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
        gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
    }

    @Override
    public void onSurfaceChanged(GL10 gl, int width, int height) {
        gl.glViewport(0, 0, width, height);
        float ratio = (float) width / height;
        gl.glMatrixMode(GL10.GL_PROJECTION);
        gl.glLoadIdentity();
        gl.glFrustumf(-ratio, ratio, -1, 1, 1, 10);
        // 设置观察模型
        gl.glMatrixMode(GL10.GL_MODELVIEW);
        gl.glLoadIdentity();
    }

    @Override
    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
        // 告诉系统对透视进行修正
        gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
        // 设置背景色为绿色
        gl.glClearColor(0, 1, 0, 0);
        // 启用阴影平滑
        gl.glShadeModel(GL10.GL_SMOOTH);

        // 设置深度缓存
        gl.glClearDepthf(one);
        // 启用深度测试
        gl.glEnable(GL10.GL_DEPTH_TEST);
        // 所做深度测试的类型
        gl.glDepthFunc(GL10.GL_LEQUAL);

        // 启用纹理
        gl.glEnable(GL10.GL_TEXTURE_2D); // 不启用没有效果的
        // 创建纹理
        gl.glGenTextures(1, textures, 0);
        // 绑定纹理
        gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
        // 生成纹理
        GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, BitGL.bitmapA, 0);
        
        // 线性滤波  
        gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER,GL10.GL_LINEAR);  
        gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER,GL10.GL_LINEAR);
    }
}

public class MainActivity5  extends Activity implements OnGestureListener {
	// 定义旋转角度  
    public static float anglex = 0f;  
    public static float angley = 0f;  
    static final float ROTATE_FACTOR = 60;  
    // 定义手势检测器实例  
    GestureDetector detector;  
  
    @Override  
    public void onCreate(Bundle savedInstanceState)  
    {  
        super.onCreate(savedInstanceState);  
        // 载入图片
        BitGL.init(this.getResources());
        // 创建一个GLSurfaceView，用于显示OpenGL绘制的图形  
        GLSurfaceView glView = new GLSurfaceView(this);  
        // 创建GLSurfaceView的内容绘制器  
        MyRender myRender = new MyRender();  
        // 为GLSurfaceView设置绘制器  
        glView.setRenderer(myRender);  
        setContentView(glView);  
        // 创建手势检测器  
        detector = new GestureDetector(this);  
    }  
    @Override  
    public boolean onTouchEvent(MotionEvent me)  
    {  
        // 将该Activity上的触碰事件交给GestureDetector处理  
    	anglex = me.getX();
    	angley = me.getY();
    	return true;
    }  
  
    @Override  
    public boolean onFling(MotionEvent event1, MotionEvent event2,  
        float velocityX, float velocityY)  
    {  
        return true;  
    }  
  
    @Override  
    public boolean onDown(MotionEvent arg0)  
    {  
        return false;  
    }  
  
    @Override  
    public void onLongPress(MotionEvent event)  
    {  
    }  
  
    @Override  
    public boolean onScroll(MotionEvent event1, MotionEvent event2,  
        float distanceX, float distanceY)  
    {  
        return false;  
    }  
  
    @Override  
    public void onShowPress(MotionEvent event)  
    {  
    }  
  
    @Override  
    public boolean onSingleTapUp(MotionEvent event)  
    {  
        return false;  
    }
}

Android