Как заполнить каждую сторону куба разными текстурами в OpenGL ES 1.1?

Пожалуйста, мне нужны учебные пособия / примеры кода, как заполнить каждую сторону куба разными текстурами в OpenGL ES 1.1

Я нашел много обучающие программы, но ни один из них не объясняет четко, как наложить разные текстуры на каждую грань, и ни один из них не дает простых примеров кода, как это сделать.

Мой реальный код (из примеров), который рисует куб с одинаковой текстурой на каждой грани:

public class Cube {

/** The buffer holding the vertices */
private FloatBuffer vertexBuffer;
/** The buffer holding the texture coordinates */
private FloatBuffer textureBuffer;
/** The buffer holding the indices */
private ByteBuffer indexBuffer;

/** Our texture pointer */
private int[] textures = new int[1];

/** 
 * The initial vertex definition
 * 
 * Note that each face is defined, even
 * if indices are available, because
 * of the texturing we want to achieve 
 */ 
private float vertices[] = {
                    //Vertices according to faces
                    -1.0f, -1.0f, 1.0f, //Vertex 0
                    1.0f, -1.0f, 1.0f,  //v1
                    -1.0f, 1.0f, 1.0f,  //v2
                    1.0f, 1.0f, 1.0f,   //v3

                    1.0f, -1.0f, 1.0f,  //...
                    1.0f, -1.0f, -1.0f,         
                    1.0f, 1.0f, 1.0f,
                    1.0f, 1.0f, -1.0f,

                    1.0f, -1.0f, -1.0f,
                    -1.0f, -1.0f, -1.0f,            
                    1.0f, 1.0f, -1.0f,
                    -1.0f, 1.0f, -1.0f,

                    -1.0f, -1.0f, -1.0f,
                    -1.0f, -1.0f, 1.0f,         
                    -1.0f, 1.0f, -1.0f,
                    -1.0f, 1.0f, 1.0f,

                    -1.0f, -1.0f, -1.0f,
                    1.0f, -1.0f, -1.0f,         
                    -1.0f, -1.0f, 1.0f,
                    1.0f, -1.0f, 1.0f,

                    -1.0f, 1.0f, 1.0f,
                    1.0f, 1.0f, 1.0f,           
                    -1.0f, 1.0f, -1.0f,
                    1.0f, 1.0f, -1.0f,
                                        };

/** The initial texture coordinates (u, v) */   
private float texture[] = {         
                    //Mapping coordinates for the vertices
                    0.0f, 0.0f,
                    0.0f, 1.0f,
                    1.0f, 0.0f,
                    1.0f, 1.0f, 

                    0.0f, 0.0f,
                    0.0f, 1.0f,
                    1.0f, 0.0f,
                    1.0f, 1.0f,

                    0.0f, 0.0f,
                    0.0f, 1.0f,
                    1.0f, 0.0f,
                    1.0f, 1.0f,

                    0.0f, 0.0f,
                    0.0f, 1.0f,
                    1.0f, 0.0f,
                    1.0f, 1.0f,

                    0.0f, 0.0f,
                    0.0f, 1.0f,
                    1.0f, 0.0f,
                    1.0f, 1.0f,

                    0.0f, 0.0f,
                    0.0f, 1.0f,
                    1.0f, 0.0f,
                    1.0f, 1.0f,

                                        };

/** The initial indices definition */   
private byte indices[] = {
                    //Faces definition
                    0,1,3, 0,3,2,           //Face front
                    4,5,7, 4,7,6,           //Face right
                    8,9,11, 8,11,10,        //... 
                    12,13,15, 12,15,14,     
                    16,17,19, 16,19,18,     
                    20,21,23, 20,23,22,     
                                        };

/**
 * The Cube constructor.
 * 
 * Initiate the buffers.
 */
public Cube() {
    //
    ByteBuffer byteBuf = ByteBuffer.allocateDirect(vertices.length * 4);
    byteBuf.order(ByteOrder.nativeOrder());
    vertexBuffer = byteBuf.asFloatBuffer();
    vertexBuffer.put(vertices);
    vertexBuffer.position(0);

    //
    byteBuf = ByteBuffer.allocateDirect(texture.length * 4);
    byteBuf.order(ByteOrder.nativeOrder());
    textureBuffer = byteBuf.asFloatBuffer();
    textureBuffer.put(texture);
    textureBuffer.position(0);

    //
    indexBuffer = ByteBuffer.allocateDirect(indices.length);
    indexBuffer.put(indices);
    indexBuffer.position(0);
}

/**
 * The object own drawing function.
 * Called from the renderer to redraw this instance
 * with possible changes in values.
 * 
 * @param gl - The GL Context
 */
public void draw(GL10 gl) {
    //Bind our only previously generated texture in this case
    gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);

    //Point to our buffers
    gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
    gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);

    //Set the face rotation
    gl.glFrontFace(GL10.GL_CCW);

    //Enable the vertex and texture state
    gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
    gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, textureBuffer);

    //Draw the vertices as triangles, based on the Index Buffer information
    gl.glDrawElements(GL10.GL_TRIANGLES, indices.length, GL10.GL_UNSIGNED_BYTE, indexBuffer);

    //Disable the client state before leaving
    gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
    gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
}

/**
 * Load the textures
 * 
 * @param gl - The GL Context
 * @param context - The Activity context
 */
public void loadGLTexture(GL10 gl, Context context) {
    //Get the texture from the Android resource directory
    InputStream is = context.getResources().openRawResource(R.drawable.nehe);
    Bitmap bitmap = null;
    try {
        //BitmapFactory is an Android graphics utility for images
        bitmap = BitmapFactory.decodeStream(is);

    } finally {
        //Always clear and close
        try {
            is.close();
            is = null;
        } catch (IOException e) {
        }
    }

    //Generate one texture pointer...
    gl.glGenTextures(1, textures, 0);
    //...and bind it to our array
    gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);

    //Create Nearest Filtered Texture
    gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
    gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);

    //Different possible texture parameters, e.g. GL10.GL_CLAMP_TO_EDGE
    gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_REPEAT);
    gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_REPEAT);

    //Use the Android GLUtils to specify a two-dimensional texture image from our bitmap
    GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);

    //Clean up
    bitmap.recycle();
}
}