update Swift 4 syntax and integer protocol

Author: tayloraswift

sources/noise/cell.swift

@@ -301,9 +301,12 @@ extension _CellNoise3D
 
         //          0b XXX YYY ZZ
 
-        let dp:Math.DoubleV3 = ((Double(hash >> 5                                         ) - 7/2) * 1/8,
-                                (Double(hash >> 2 & 0b0111                                ) - 7/2) * 1/8,
-                                (Double(hash << 1 & 0b0111 + ((hash >> 5 ^ hash >> 2) & 1)) - 7/2) * 1/8)
+        let axes:Math.DoubleV3 = Math.cast_double(( hash >> 5,
+                                                    hash >> 2 & 0b0111,
+                                                    hash << 1 & 0b0111 + ((hash >> 5 ^ hash >> 2) & 1)))
+        let dp:Math.DoubleV3 = ((axes.x - 7.0/2.0) * 1.0/8.0,
+                                (axes.y - 7.0/2.0) * 1.0/8.0,
+                                (axes.z - 7.0/2.0) * 1.0/8.0)
 
         let dv:Math.DoubleV3 = Math.sub(Math.add(Math.cast_double(generating_point), dp), sample_point)
         return Math.dot(dv, dv)

sources/noise/compounds.swift

@@ -113,7 +113,6 @@ extension FBM where Source:TilingNoise
     public
     init(tiling source:Source, octaves:Int, persistence:Double = 0.5)
     {
-        print("tiling fbm")
         // calculate maximum range
         let range_inverse:Double
         if persistence == 0.5

sources/noise/hash.swift

@@ -129,7 +129,7 @@ struct RandomXorshift
 
     init(seed:Int)
     {
-        self.state128 = (1, 0, UInt32(extendingOrTruncating: seed >> UInt32.bitWidth), UInt32(extendingOrTruncating: seed))
+        self.state128 = (1, 0, UInt32(truncatingIfNeeded: seed >> UInt32.bitWidth), UInt32(truncatingIfNeeded: seed))
     }
 
     mutating

tests/noise/tests.swift

@@ -23,7 +23,7 @@ func write_png(path:String, width:Int, height:Int, pixbytes:UnsafeBufferPointer<
 
 extension UInt8
 {
-    init<T>(clamping value:T) where T:FloatingPoint
+    init<T>(clamping value:T) where T:BinaryFloatingPoint
     {
         self.init(Swift.max(0, Swift.min(255, value)))
     }