The Skung Rockification of Ziggy Skungdust and the SIMD's

Sources/Maths/Vector4.swift

@@ -0,0 +1,56 @@
+#if USE_SIMD
+import simd
+#endif
+
+
+#if USE_SIMD
+public typealias Vector4 = SIMD4
+#else
+
+public struct Vector4<T: FloatingPoint>: Equatable
+{
+	public typealias Scalar = T
+
+	public var x, y, z, w: T
+
+	public init() { self.x = 0; self.y = 0; self.z = 0; self.w = 0 }
+	public init(_ x: T, _ y: T, _ z: T, _ w: T) { self.x = x; self.y = y; self.z = z; self.w = w }
+}
+
+public extension Vector4
+{
+	// constants
+	@inline(__always) static var zero: Self { Self(0, 0, 0, 0) }
+	@inline(__always) static var one: Self { Self(1, 1, 1, 1) }
+
+	subscript(index: Int) -> T
+	{
+		get
+		{
+			switch index
+			{
+			case 0: x
+			case 1: y
+			case 2: z
+			case 3: w
+			default: fatalError()
+			}
+		}
+	}
+
+	init(_ xyz: Vector3<T>, _ w: T) { self.x = xyz.x; self.y =  xyz.y; self.z = xyz.z; self.w = w }
+}
+
+#endif
+
+public extension Vector4 where Scalar: FloatingPoint
+{
+	@inline(__always) static var X: Self { Self(1, 0, 0, 0) }
+	@inline(__always) static var Y: Self { Self(0, 1, 0, 0) }
+	@inline(__always) static var Z: Self { Self(0, 0, 1, 0) }
+	@inline(__always) static var W: Self { Self(0, 0, 0, 1) }
+}
+
+
+public typealias Vec4f = Vector4<Float>
+public typealias Vec4d = Vector4<Double>