From b2ae0a3ce9536029fb0e637eb4d7af8c9050cfc0 Mon Sep 17 00:00:00 2001
From: Christophe Riccio <g.truc.creation@gmail.com>
Date: Wed, 13 Apr 2011 22:30:20 +0100
Subject: [PATCH] Added detail code for simplex noise implementation

---
 glm/core/func_noise.inl | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/glm/core/func_noise.inl b/glm/core/func_noise.inl
index c780534e..a8e700ec 100644
--- a/glm/core/func_noise.inl
+++ b/glm/core/func_noise.inl
@@ -12,6 +12,41 @@ namespace glm
 	namespace core{
 	namespace function{
 	namespace noise{
+    namespace detail
+    {
+        template <typenane valType, typenane vecType> 
+        inline vecType permute
+        (
+            vecType const & x0,
+            detail::tvec3<valType> const & p 
+        ) 
+        {
+            vecType x1 = mod(x0 * p.y, p.x);
+            return floor(  mod( (x1 + p.z) *x0, p.x ));
+        }
+
+        inline detail::tvec2<T> permute
+        (
+            detail::tvec2<T> const & x0, 
+            detail::tvec3<valType> const & p
+        )
+        {
+            vec2 x1 = mod(x0 * p.y, p.x);
+            return floor(  mod( (x1 + p.z) *x0, p.x ));
+        }
+
+        inline vec3 permute(vec3 x0,vec3 p)
+        {
+            vec3 x1 = mod(x0 * p.y, p.x);
+            return floor(  mod( (x1 + p.z) *x0, p.x ));
+        }
+
+        inline vec4 permute(vec4 x0,vec3 p)
+        {
+            vec4 x1 = mod(x0 * p.y, p.x);
+            return floor(  mod( (x1 + p.z) *x0, p.x ));
+        }
+    }//namespace detail
 
 	// noise1
 	template <typename genType>