Updating uniform values (cont’d)

Update our motion variables each frame

gl.uniform1f(location, value); 
function render() {
   gl.clear(gl.COLOR_BUFFER_BIT);

   gl.useProgram(program);
   angle += 3.0; // rotate three degrees each frame
   angle %= 360.0;

   gl.uniform1f(uAngle, angle);

   gl.drawArrays(gl.TRIANGLES, 0, 3);
}