This changeset is the step 1 of 2 in refactoring

OpenSim.Region.Environment into a "framework" part and a modules only
part. This first changeset refactors OpenSim.Region.Environment.Scenes,
OpenSim.Region.Environment.Interfaces, and OpenSim.Region.Interfaces
into OpenSim.Region.Framework.{Interfaces,Scenes} leaving only region
modules in OpenSim.Region.Environment.

The next step will be to move region modules up from
OpenSim.Region.Environment.Modules to OpenSim.Region.CoreModules and
then sort out which modules are really core modules and which should
move out to forge.

I've been very careful to NOT BREAK anything. i hope i've
succeeded. as this is the work of a whole week i hope i managed to
keep track with the applied patches of the last week --- could any of
you that did check in stuff have a look at whether it survived? thx!

1 files changed, 132 insertions, 0 deletions

diff --git a/OpenSim/Region/Framework/Scenes/TerrainUtil.cs b/OpenSim/Region/Framework/Scenes/TerrainUtil.cs
new file mode 100644
index 0000000..318a682
--- /dev/null
+++ b/OpenSim/Region/Framework/Scenes/TerrainUtil.cs
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSim Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using OpenSim.Region.Framework.Interfaces;
+
+namespace OpenSim.Region.Framework.Scenes
+{
+    public static class TerrainUtil
+    {
+        public static double MetersToSphericalStrength(double size)
+        {
+            //return Math.Pow(2, size);
+            return (size + 1) * 1.35; // MCP: a more useful brush size range
+        }
+
+        public static double SphericalFactor(double x, double y, double rx, double ry, double size)
+        {
+            return size * size - ((x - rx) * (x - rx) + (y - ry) * (y - ry));
+        }
+
+        public static double GetBilinearInterpolate(double x, double y, ITerrainChannel map)
+        {
+            int w = map.Width;
+            int h = map.Height;
+
+            if (x > w - 2.0)
+                x = w - 2.0;
+            if (y > h - 2.0)
+                y = h - 2.0;
+            if (x < 0.0)
+                x = 0.0;
+            if (y < 0.0)
+                y = 0.0;
+
+            const int stepSize = 1;
+            double h00 = map[(int) x, (int) y];
+            double h10 = map[(int) x + stepSize, (int) y];
+            double h01 = map[(int) x, (int) y + stepSize];
+            double h11 = map[(int) x + stepSize, (int) y + stepSize];
+            double h1 = h00;
+            double h2 = h10;
+            double h3 = h01;
+            double h4 = h11;
+            double a00 = h1;
+            double a10 = h2 - h1;
+            double a01 = h3 - h1;
+            double a11 = h1 - h2 - h3 + h4;
+            double partialx = x - (int) x;
+            double partialz = y - (int) y;
+            double hi = a00 + (a10 * partialx) + (a01 * partialz) + (a11 * partialx * partialz);
+            return hi;
+        }
+
+        private static double Noise(double x, double y)
+        {
+            int n = (int) x + (int) (y * 749);
+            n = (n << 13) ^ n;
+            return (1.0 - ((n * (n * n * 15731 + 789221) + 1376312589) & 0x7fffffff) / 1073741824.0);
+        }
+
+        private static double SmoothedNoise1(double x, double y)
+        {
+            double corners = (Noise(x - 1, y - 1) + Noise(x + 1, y - 1) + Noise(x - 1, y + 1) + Noise(x + 1, y + 1)) / 16;
+            double sides = (Noise(x - 1, y) + Noise(x + 1, y) + Noise(x, y - 1) + Noise(x, y + 1)) / 8;
+            double center = Noise(x, y) / 4;
+            return corners + sides + center;
+        }
+
+        private static double Interpolate(double x, double y, double z)
+        {
+            return (x * (1.0 - z)) + (y * z);
+        }
+
+        public static double InterpolatedNoise(double x, double y)
+        {
+            int integer_X = (int) (x);
+            double fractional_X = x - integer_X;
+
+            int integer_Y = (int) y;
+            double fractional_Y = y - integer_Y;
+
+            double v1 = SmoothedNoise1(integer_X, integer_Y);
+            double v2 = SmoothedNoise1(integer_X + 1, integer_Y);
+            double v3 = SmoothedNoise1(integer_X, integer_Y + 1);
+            double v4 = SmoothedNoise1(integer_X + 1, integer_Y + 1);
+
+            double i1 = Interpolate(v1, v2, fractional_X);
+            double i2 = Interpolate(v3, v4, fractional_X);
+
+            return Interpolate(i1, i2, fractional_Y);
+        }
+
+        public static double PerlinNoise2D(double x, double y, int octaves, double persistence)
+        {
+            double total = 0.0;
+
+            for (int i = 0; i < octaves; i++)
+            {
+                double frequency = Math.Pow(2, i);
+                double amplitude = Math.Pow(persistence, i);
+
+                total += InterpolatedNoise(x * frequency, y * frequency) * amplitude;
+            }
+            return total;
+        }
+    }
+}