Add swizzling up to dimension 3 to vectors.

src/base/mod.rs

@@ -12,6 +12,7 @@ pub mod storage;
 
 mod alias;
 mod alias_slice;
+mod swizzle;
 mod cg;
 mod componentwise;
 mod construction;

src/base/swizzle.rs

@@ -0,0 +1,66 @@
+use base::{Scalar, Vector, DimName, U0, U1, U2, U3, U4, Vector2, Vector3};
+use storage::Storage;
+use typenum::{Cmp, Greater};
+
+
+macro_rules! impl_swizzle {
+    ($(where $BaseDim: ty: $name: ident() -> $Result: ident[$($i: expr),*]);*) => {
+        $(
+            impl<N: Scalar, D: DimName, S: Storage<N, D>> Vector<N, D, S> {
+                #[inline]
+                pub fn $name(&self) -> $Result<N>
+                    where D::Value: Cmp<$BaseDim, Output=Greater> {
+                    $Result::new($(self[$i]),*)
+                }
+            }
+        )*
+    }
+}
+
+impl_swizzle!(
+    where U0: xx() -> Vector2[0, 0];
+    where U1: xy() -> Vector2[0, 1];
+    where U2: xz() -> Vector2[0, 2];
+    where U1: yx() -> Vector2[1, 0];
+    where U1: yy() -> Vector2[1, 1];
+    where U1: yz() -> Vector2[1, 2];
+    where U2: zx() -> Vector2[2, 0];
+    where U2: zy() -> Vector2[2, 1];
+    where U2: zz() -> Vector2[2, 2];
+
+    where U0: xxx() -> Vector3[0, 0, 0];
+    where U1: xxy() -> Vector3[0, 0, 1];
+    where U2: xxz() -> Vector3[0, 0, 2];
+
+    where U1: xyx() -> Vector3[0, 1, 0];
+    where U1: xyy() -> Vector3[0, 1, 1];
+    where U2: xyz() -> Vector3[0, 1, 2];
+
+    where U2: xzx() -> Vector3[0, 2, 0];
+    where U2: xzy() -> Vector3[0, 2, 1];
+    where U2: xzz() -> Vector3[0, 2, 2];
+
+    where U1: yxx() -> Vector3[1, 0, 0];
+    where U1: yxy() -> Vector3[1, 0, 1];
+    where U2: yxz() -> Vector3[1, 0, 2];
+
+    where U1: yyx() -> Vector3[1, 1, 0];
+    where U1: yyy() -> Vector3[1, 1, 1];
+    where U2: yyz() -> Vector3[1, 1, 2];
+
+    where U2: yzx() -> Vector3[1, 2, 0];
+    where U2: yzy() -> Vector3[1, 2, 1];
+    where U2: yzz() -> Vector3[1, 2, 2];
+
+    where U2: zxx() -> Vector3[2, 0, 0];
+    where U2: zxy() -> Vector3[2, 0, 1];
+    where U2: zxz() -> Vector3[2, 0, 2];
+
+    where U2: zyx() -> Vector3[2, 1, 0];
+    where U2: zyy() -> Vector3[2, 1, 1];
+    where U2: zyz() -> Vector3[2, 1, 2];
+
+    where U2: zzx() -> Vector3[2, 2, 0];
+    where U2: zzy() -> Vector3[2, 2, 1];
+    where U2: zzz() -> Vector3[2, 2, 2]
+);