func setResolution(
gl *webgl.Context, canvas *js.Object, uResolution *js.Object) {
width := canvas.Get("clientWidth").Int()
height := canvas.Get("clientHeight").Int()
if (canvas.Get("width").Int() != width) ||
(canvas.Get("height").Int() != height) {
canvas.Set("width", width)
canvas.Set("height", height)
}
gl.Viewport(0, 0, width, height)
gl.Uniform2f(uResolution, float32(width), float32(height))
}