libnoise-bestest.diff

Index: libnoise/noise/src/interp.h
===================================================================
--- libnoise.orig/noise/src/interp.h	2009-06-07 18:50:45.000000000 +0200
+++ libnoise/noise/src/interp.h	2009-06-07 18:51:39.000000000 +0200
@@ -105,6 +105,18 @@
     return (6.0 * a5) - (15.0 * a4) + (10.0 * a3);
   }
 
+  inline double SCurve7 (double a)
+  {
+      double a2 = a * a;
+      //double a3 = a2 * a;
+      double a4 = a2 * a2;
+      double a5 = a4 * a;
+      double a6 = a4 * a2;
+      double a7 = a5 * a2;
+      //return 6.0*a5 - 15.0*a4 + 10.0*a3;
+      return -20.0*a7 + 70.0*a6 - 84.0*a5 + 35.0*a4;
+  }
+
   // @}
 
 }
Index: libnoise/noise/src/noisegen.cpp
===================================================================
--- libnoise.orig/noise/src/noisegen.cpp	2009-06-07 18:51:18.000000000 +0200
+++ libnoise/noise/src/noisegen.cpp	2009-06-07 18:51:39.000000000 +0200
@@ -86,6 +86,11 @@
       ys = SCurve5 (y - (double)y0);
       zs = SCurve5 (z - (double)z0);
       break;
+    case QUALITY_BESTEST:
+      xs = SCurve7 (x - (double)x0);
+      ys = SCurve7 (y - (double)y0);
+      zs = SCurve7 (z - (double)z0);
+      break;
   }
 
   // Now calculate the noise values at each vertex of the cube.  To generate
@@ -189,6 +194,11 @@
       ys = SCurve5 (y - (double)y0);
       zs = SCurve5 (z - (double)z0);
       break;
+    case QUALITY_BESTEST:
+      xs = SCurve7 (x - (double)x0);
+      ys = SCurve7 (y - (double)y0);
+      zs = SCurve7 (z - (double)z0);
+      break;
   }
 
   // Now calculate the noise values at each vertex of the cube.  To generate
Index: libnoise/noise/src/noisegen.h
===================================================================
--- libnoise.orig/noise/src/noisegen.h	2009-06-07 18:51:18.000000000 +0200
+++ libnoise/noise/src/noisegen.h	2009-06-07 18:51:39.000000000 +0200
@@ -55,7 +55,9 @@
     /// image, there are no "creasing" artifacts in the resulting image.  This
     /// is because the first and second derivatives of that function are
     /// continuous at integer boundaries.
-    QUALITY_BEST = 2
+    QUALITY_BEST = 2,
+
+    QUALITY_BESTEST = 3
 
   };