/// The location of a UI element, in one of a few
/// possible coordinate systems.
///
/// Positive Y always points up,
/// positive X always points right.
#[derive(Debug, Clone)]
pub enum PositionAnchor {
	/// Position of this sprite's center,
	/// relative to the nw corner of the window.
	NwC,

	/// Position of this sprite's nw corner,
	/// relative to the nw corner of the window.
	NwNw,

	/// Position of this sprite's ne corner,
	/// relative to the nw corner of the window.
	NwNe,

	/// Position of this sprite's sw corner,
	/// relative to the nw corner of the window.
	NwSw,

	/// Position of this sprite's se corner,
	/// relative to the nw corner of the window.
	NwSe,

	/// Position of this sprite's ne corner,
	/// relative to the ne corner of the window.
	NeNe,

	/// Position of this sprite's center,
	/// relative to the center of the window.
	CC,

	/// Position of this sprite's NW corner,
	/// relative to the center of the window.
	CNw,
}

// These offsets are implemented in wgsl shaders.

impl PositionAnchor {
	/// Get the uint that represents this anchor mode in shaders
	pub fn to_int(&self) -> u32 {
		match self {
			Self::NwC => 0,
			Self::NwNw => 1,
			Self::NwNe => 2,
			Self::NwSw => 3,
			Self::NwSe => 4,
			Self::NeNe => 5,
			Self::CC => 6,
			Self::CNw => 7,
		}
	}
}