expose Xorshift RNG max

Author: tayloraswift

sources/noise/noise.swift

@@ -217,14 +217,15 @@ struct RandomXorshift
     private
     var state128:(UInt32, UInt32, UInt32, UInt32)
 
+    public
     var max:UInt32
     {
         return UInt32.max
     }
 
     init(seed:Int)
     {
-        self.state128 = (1, 0, UInt32(extendingOrTruncating: seed >> 32), UInt32(extendingOrTruncating: seed))
+        self.state128 = (1, 0, UInt32(extendingOrTruncating: seed >> UInt32.bitWidth), UInt32(extendingOrTruncating: seed))
     }
 
     mutating
@@ -245,7 +246,7 @@ struct RandomXorshift
     mutating
     func generate(less_than maximum:UInt32) -> UInt32
     {
-        let upper_bound:UInt32 = UInt32.max - UInt32.max % maximum
+        let upper_bound:UInt32 = self.max - self.max % maximum
         var x:UInt32 = 0
         repeat
         {

tests/LinuxMain.swift

@@ -4,20 +4,6 @@ import MaxPNG
 
 let viewer_size:Int = 1024
 
-func rgba_from_argb32(_ argb32:[UInt32]) -> [UInt8]
-{
-    var rgba:[UInt8] = []
-    rgba.reserveCapacity(argb32.count * 4)
-    for argb in argb32
-    {
-        rgba.append(UInt8(extendingOrTruncating: argb >> 16))
-        rgba.append(UInt8(extendingOrTruncating: argb >> 8 ))
-        rgba.append(UInt8(extendingOrTruncating: argb      ))
-        rgba.append(UInt8(extendingOrTruncating: argb >> 24))
-    }
-    return rgba
-}
-
 import func Glibc.clock