added simplex noise

Based on mesa3d MIT-licensed code

Author: agladysh

AUTHORS

@@ -1,5 +1,8 @@
 Acknowledgements
-----------------
+================
+
+Perlin noise
+------------
 
 Perlin Noise Implementation is based on Ken Perlin's own Java reference code:
 
@@ -11,9 +14,14 @@ Tiled Perlin noise is based on Perlin Noise Math FAQ by M. Zucker
     http://web.archive.org/web/20070708001151/\
       http://www.cs.cmu.edu/~mzucker/code/perlin-noise-math-faq.html
 
+Simplex noise
+-------------
+
+Simplex noise implementation is taken from MIT-licensed Mesa 7.5 library.
+http://www.mesa3d.org/
 
 Lua-Noise authors
------------------
+=================
 
 This Lua C module was coded by:
 

make.sh

@@ -4,3 +4,5 @@
 # Under Linux you'd need other flags to create .so.
 
 gcc src/perlin.c -O2 -Werror -Wall --pedantic -c89 $LDFLAGS -llua -dynamiclib -undefined dynamic_lookup -o perlin.so
+
+gcc src/mesa/prog_noise.c src/simplex.c -O2 -Werror -Wall --pedantic -c89 $LDFLAGS -llua -dynamiclib -undefined dynamic_lookup -o simplex.so

src/mesa/VERSION

@@ -0,0 +1,5 @@
+Excerpt from MIT-licensed Mesa 7.5
+http://cgit.freedesktop.org/mesa/mesa/
+
+File main/imports.h is substitute with slim version
+to suit the needs of the prog_noise.c.

src/mesa/main/imports.h

@@ -0,0 +1,20 @@
+/*
+* imports.h: drop-in replacement for mesa imports.h
+* For the needs of prog_noise.c
+* This file is NOT from the mesa sources.
+*/
+
+#ifndef IMPORTS_H
+#define IMPORTS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef float GLfloat;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* IMPORTS_H */