        uniform mat4 uPMatrix;

            varying vec4 vColor;

            void main(void) {
                gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
                vColor = aVertexColor;
            }
        </script>

        <script type="text/javascript">
          learningwebgl.lesson_02.start();
        </script>
    </body>
</html>