OpenGL ES 2.0 - Cube

// init:
GLES20.glEnable(GLES20.GL_DEPTH_TEST);

Mesh cube = new Mesh(false, 8, 36,
    new VertexAttribute(VertexAttribute.POSITION, 3, ShaderProgram.POSITION_ATTRIBUTE),
    new VertexAttribute(VertexAttribute.COLOR_PACKED, 4, ShaderProgram.COLOR_ATTRIBUTE)
);

float x = -100;
float y = -50;
float z = 250;

float w = 50;
float h = 50;
float l = 50;

float r = Color.RED.toFloatBits();
float g = Color.GREEN.toFloatBits();
float b = Color.BLUE.toFloatBits();

float[] vertices = {
    -w / 2f + x, y, l / 2f + z,  // 0
    r,
    -w / 2f + x, h + y, l / 2f + z, // 1
    r,
    w / 2f + x, h + y, l / 2f + z, // 2
    b,
    w / 2f + x, y, l / 2f + z, // 3
    b,

    w / 2f + x, y, -l / 2f + z, // 4
    g,
    w / 2f + x, y + h, -l / 2f + z, // 5
    g,
    -w / 2f + x, y + h, -l / 2f + z, // 6
    r,
    -w / 2f + x, y, -l / 2f + z, // 7
    r
};

short[] indices = {
    0, 1, 2, 2, 3, 0,
    3, 2, 5, 5, 4, 3,
    4, 5, 6, 6, 7, 4,
    7, 6, 1, 1, 0, 7,
    0, 3, 4, 4, 7, 0,
    1, 6, 5, 5, 2, 1
};

cube.setIndices(indices);
cube.setVertices(vertices);

// render:
GLES20.glClearColor(0f, 0f, 0f, 1f);
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);

shaderProgram.begin();
cube.render(shaderProgram, GLES20.GL_TRIANGLES, 0, 36);
shaderProgram.end();