[Plib-cvs] plib/src/sg sgPerlinNoise.cxx,NONE,1.1 Makefile.am,1.6,1.7 sg.h,1.44,1.45

[Steve B. <sj...@us...>]

Update of /cvsroot/plib/plib/src/sg
In directory usw-pr-cvs1:/tmp/cvs-serv5373/plib/src/sg

Modified Files:
	Makefile.am sg.h 
Added Files:
	sgPerlinNoise.cxx 
Log Message:
Added Perlin Noise functions - plus documentation.


--- NEW FILE: sgPerlinNoise.cxx ---


/*
  sgPerlinNoise
 
  This is a class to implement coherent noise over 1, 2, or 3
  dimensions.  The implementation is based on the Ken Perlin's
  noise function and borrows heavily from Matt Zucker's implementation.
*/


#include <stdio.h>
#include <time.h>
#include <math.h>
#include "sg.h"

static unsigned int *permTable = NULL ;


[...255 lines suppressed...]
{
  int i ;

  for ( i = 0 ; i < SG_PERLIN_NOISE_WRAP_INDEX ; i++ )
  {
    sgSetVec3 ( gradTable [ i ], randFloat(), randFloat(), randFloat() ) ;
    sgNormalizeVec3 ( gradTable [ i ] ) ;
  }

  for ( i = 0 ; i < SG_PERLIN_NOISE_WRAP_INDEX + 2 ; i++ )
  {
    gradTable [ SG_PERLIN_NOISE_WRAP_INDEX + i ][ 0 ] = gradTable [ i ][ 0 ] ;
    gradTable [ SG_PERLIN_NOISE_WRAP_INDEX + i ][ 1 ] = gradTable [ i ][ 1 ] ;
    gradTable [ SG_PERLIN_NOISE_WRAP_INDEX + i ][ 2 ] = gradTable [ i ][ 2 ] ;
  }

  initPermTable () ;
}



Index: Makefile.am
===================================================================
RCS file: /cvsroot/plib/plib/src/sg/Makefile.am,v
retrieving revision 1.6
retrieving revision 1.7
diff -u -d -r1.6 -r1.7
--- Makefile.am	18 Dec 2001 04:06:04 -0000	1.6
+++ Makefile.am	24 Aug 2002 23:22:13 -0000	1.7
@@ -2,7 +2,9 @@
 
 include_HEADERS = sg.h
 
-libplibsg_a_SOURCES = sg.cxx sgd.cxx sgIsect.cxx sgdIsect.cxx
+libplibsg_a_SOURCES = sg.cxx sgd.cxx \
+                      sgIsect.cxx sgdIsect.cxx \
+                      sgPerlinNoise.cxx
 
 INCLUDES = -I$(top_srcdir)/src/util
 

Index: sg.h
===================================================================
RCS file: /cvsroot/plib/plib/src/sg/sg.h,v
retrieving revision 1.44
retrieving revision 1.45
diff -u -d -r1.44 -r1.45
--- sg.h	11 Aug 2002 19:52:07 -0000	1.44
+++ sg.h	24 Aug 2002 23:22:13 -0000	1.45
@@ -574,6 +574,10 @@
 
 extern void sgVectorProductVec3 ( sgVec3 dst, const sgVec3 a, const sgVec3 b ) ;
 
+inline SGfloat sgLerp ( const SGfloat a, const SGfloat b, const SGfloat f )
+{
+  return a + f * ( b - a ) ;
+}
 
 inline void sgLerpVec4 ( sgVec4 dst, const sgVec4 a, const sgVec4 b, const SGfloat f )
 {
@@ -2795,6 +2799,86 @@
[...66 lines suppressed...]
+  sgVec3 gradTable [ SG_PERLIN_NOISE_WRAP_INDEX * 2 + 2 ] ;
+
+public:
+
+  sgPerlinNoise_3D () ;
+
+  void regenerate () ;
+
+  SGfloat getNoise ( sgVec3 pos ) ;
+  SGfloat getNoise ( SGfloat x, SGfloat y, SGfloat z )
+  {
+    sgVec3 p ;
+    sgSetVec3 ( p, x, y, z ) ;
+    return getNoise ( p ) ;
+  }
+} ;
+
 
 
 #endif