func setupGeometry(gl *webgl.Context, program *js.Object) {
gl.BindBuffer(gl.ARRAY_BUFFER, gl.CreateBuffer())
gl.BufferData(gl.ARRAY_BUFFER, buildArray(), gl.STATIC_DRAW)
positionLocation := gl.GetAttribLocation(program, "a_position")
gl.EnableVertexAttribArray(positionLocation)
gl.VertexAttribPointer(positionLocation, 2, gl.FLOAT, false, 0, 0)
}