From 9cb9ef381197c7e378937a5a0de01a0d1412ab79 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Thu, 11 Jun 2015 19:32:57 +1000
Subject: [PATCH] n/turbulence: add seed accessors

---
 noise/turbulence.hpp |  3 +++
 noise/turbulence.ipp | 23 +++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/noise/turbulence.hpp b/noise/turbulence.hpp
index f24057ce..9ccb10eb 100644
--- a/noise/turbulence.hpp
+++ b/noise/turbulence.hpp
@@ -34,6 +34,9 @@ namespace util { namespace noise {
         using seed_t = uint64_t;
         turbulence (seed_t, vector<2,T> scale);
 
+        seed_t seed (seed_t);
+        seed_t seed (void) const;
+
         constexpr T operator() (point<2,T>) const;
         
         D data;
diff --git a/noise/turbulence.ipp b/noise/turbulence.ipp
index f0ebd8a4..8d66bb64 100644
--- a/noise/turbulence.ipp
+++ b/noise/turbulence.ipp
@@ -32,6 +32,29 @@ namespace util { namespace noise {
         scale (_scale)
     { ; }
 
+    ////////////////////////////////////////////////////////////////////////////
+    template <typename T, typename D, typename P>
+    typename turbulence<T,D,P>::seed_t
+    turbulence<T,D,P>::seed (void) const
+    {
+        return data.seed ();
+    }
+
+
+    //------------------------------------------------------------------------- 
+    template <typename T, typename D, typename P>
+    typename turbulence<T,D,P>::seed_t
+    turbulence<T,D,P>::seed (seed_t _seed)
+    {
+        auto ret = _seed;
+
+        data.seed (_seed);          _seed = hash::wang (_seed);
+        perturb[0].seed (_seed);    _seed = hash::wang (_seed);
+        perturb[1].seed (_seed);    _seed = hash::wang (_seed);
+
+        return ret;
+    }
+
 
     ///////////////////////////////////////////////////////////////////////////
     template <typename T, typename D, typename P>