[gimp-help] Add Simplex Noise filter

[Julien Hardlin <jhardlin src gnome org>]

commit 48a92ab04a33b92278bf7382cd9141a4eefc72c4
Author: Julien Hardelin <jhardlin orange fr>
Date:   Sun Mar 10 17:51:53 2019 +0100

    Add Simplex Noise filter

 .../examples/render/simplex_noise-default.png      | Bin 0 -> 21098 bytes
 images/C/filters/render/simplex_noise-dialog.png   | Bin 0 -> 19301 bytes
 src/filters/render.xml                             |   2 +-
 src/filters/render/simplex-noise.xml               |  96 +++++++++++++++++++++
 4 files changed, 97 insertions(+), 1 deletion(-)
---
diff --git a/images/C/filters/examples/render/simplex_noise-default.png 
b/images/C/filters/examples/render/simplex_noise-default.png
new file mode 100644
index 000000000..5425bab78
Binary files /dev/null and b/images/C/filters/examples/render/simplex_noise-default.png differ
diff --git a/images/C/filters/render/simplex_noise-dialog.png 
b/images/C/filters/render/simplex_noise-dialog.png
new file mode 100644
index 000000000..10799e561
Binary files /dev/null and b/images/C/filters/render/simplex_noise-dialog.png differ
diff --git a/src/filters/render.xml b/src/filters/render.xml
index 6b897382d..78d9672ae 100644
--- a/src/filters/render.xml
+++ b/src/filters/render.xml
@@ -16,7 +16,7 @@
   <xi:include href="render/cell-noise.xml"/>
   <xi:include href="render/perlin-noise.xml"/>
   <xi:include href="render/plasma.xml"/>
-  <!--<xi:include href="render/simplex_noise.xml"/>-->
+  <xi:include href="render/simplex-noise.xml"/>
   <xi:include href="render/solid-noise.xml"/>
   <xi:include href="render/difference-clouds.xml"/>
 
diff --git a/src/filters/render/simplex-noise.xml b/src/filters/render/simplex-noise.xml
new file mode 100644
index 000000000..3d349f174
--- /dev/null
+++ b/src/filters/render/simplex-noise.xml
@@ -0,0 +1,96 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE sect2 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+                       "http://www.docbook.org/xml/4.3/docbookx.dtd";>
+<!-- section history:
+  2019-03-08 j.h: create, with the same doubts as before
+-->
+<sect2 xmlns:xi="http://www.w3.org/2001/XInclude"; id="gimp-filter-noise-simplex">
+  <title>Simplex Noise</title>
+
+  <indexterm>
+    <primary>Filters</primary>
+    <secondary>Render</secondary>
+    <tertiary>Simplex Noise</tertiary>
+  </indexterm>
+  <indexterm>
+    <primary>Grid</primary>
+    <secondary>Simplex Noise</secondary>
+  </indexterm>
+  
+  <sect3>
+    <title>Overview</title>
+    <para>
+      This filter generates a noise texture using the Simplex Noise algorithm.  
+      Results don't on the image you opened
+      <mediaobject>
+        <imageobject>
+          <imagedata format="PNG"
+            fileref="images/filters/examples/render/simplex_noise-default.png"/>
+        </imageobject>
+        <caption>
+          <para>
+            Filter applied with default options
+          </para>
+        </caption>
+      </mediaobject>
+    </para>
+  </sect3>
+  
+  <sect3>
+    <title>Activating the filter</title>
+    <para>
+      This filter is found in the image window menu under
+      <menuchoice>
+        <guimenu>Filters</guimenu>
+        <guisubmenu>Render</guisubmenu>
+        <guisubmenu>Noise</guisubmenu>
+        <guimenuitem>Simplex Noise…</guimenuitem>
+      </menuchoice>.
+    </para>
+  </sect3>
+  
+  <sect3>
+    <title>Options</title>
+    <figure>
+      <title><quote>Simplex Noise</quote> filter options</title>
+      <mediaobject>
+        <imageobject>
+          <imagedata format="PNG"
+            fileref="images/filters/render/simplex_noise-dialog.png"/>
+        </imageobject>
+      </mediaobject>
+    </figure>
+    <variablelist>
+      <varlistentry>
+        <term>Presets, Preview, Split view, Use selection as input</term>
+        <listitem>
+          <xi:include href="../about-common-features.xml"/>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term>Scale</term>
+        <listitem>
+          <para>
+            Scale of the noise function: works like a zoom.
+          </para>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term>Iterations</term>
+        <listitem>
+          <para>
+            The number of noise octaves.
+          </para>
+          </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term>Random seed, New seed</term>
+        <listitem>
+          <para>
+            To vary noise.
+          </para>
+          </listitem>
+      </varlistentry>
+    </variablelist>
+  </sect3>
+</sect2>
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