1 files changed, 44 insertions, 0 deletions
diff --git a/stockton-levels/src/coords.rs b/stockton-levels/src/coords.rs
new file mode 100644
index 0000000..613c932
--- /dev/null
+++ b/stockton-levels/src/coords.rs
@@ -0,0 +1,44 @@
+// Copyright (C) Oscar Shrimpton 2019  
+
+// This program is free software: you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+// more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this program.  If not, see <http://www.gnu.org/licenses/>.
+//! Marker traits for different co-ordinate systems, and functions to swizzle between them
+
+use na::Vector3;
+use na::base::Scalar;
+use std::ops::Neg;
+
+pub trait CoordSystem {}
+
+/// X points East, Y points South, Z points downwards
+pub struct Q3System;
+impl CoordSystem for Q3System {}
+
+/// X points east, Y points downwards, Z points inwards
+pub struct VulkanSystem;
+impl CoordSystem for VulkanSystem {}
+
+
+pub struct Swizzler;
+
+pub trait SwizzleFromTo<F: CoordSystem, T: CoordSystem> {
+	fn swizzle<U: Scalar + Copy + Neg<Output = U>>(vec: &mut Vector3<U>) -> ();
+}
+
+impl SwizzleFromTo<Q3System, VulkanSystem> for Swizzler {
+	fn swizzle<U: Scalar + Copy + Neg<Output = U>>(vec: &mut Vector3<U>) -> () {
+		let temp = 	vec.y;
+		vec.y = vec.z;
+		vec.z = -temp;
+	}
+}
+\ No newline at end of file