1 files changed, 78 insertions, 0 deletions
diff --git a/engine/src/terrain/com/jme3/terrain/noise/modulator/CatRom2.java b/engine/src/terrain/com/jme3/terrain/noise/modulator/CatRom2.java
new file mode 100644
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+++ b/engine/src/terrain/com/jme3/terrain/noise/modulator/CatRom2.java
@@ -0,0 +1,78 @@
+/**
+ * Copyright (c) 2011, Novyon Events
+ * 
+ * All rights reserved.
+ * 
+ * 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.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR 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.
+ * 
+ * @author Anthyon
+ */
+package com.jme3.terrain.noise.modulator;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import com.jme3.terrain.noise.ShaderUtils;
+
+public class CatRom2 implements Modulator {
+
+	private int sampleRate = 100;
+
+	private final float[] table;
+
+	private static Map<Integer, CatRom2> instances = new HashMap<Integer, CatRom2>();
+
+	public CatRom2(final int sampleRate) {
+		this.sampleRate = sampleRate;
+		this.table = new float[4 * sampleRate + 1];
+		for (int i = 0; i < 4 * sampleRate + 1; i++) {
+			float x = i / (float) sampleRate;
+			x = (float) Math.sqrt(x);
+			if (x < 1) {
+				this.table[i] = 0.5f * (2 + x * x * (-5 + x * 3));
+			} else {
+				this.table[i] = 0.5f * (4 + x * (-8 + x * (5 - x)));
+			}
+		}
+	}
+
+	public static CatRom2 getInstance(final int sampleRate) {
+		if (!CatRom2.instances.containsKey(sampleRate)) {
+			CatRom2.instances.put(sampleRate, new CatRom2(sampleRate));
+		}
+		return CatRom2.instances.get(sampleRate);
+	}
+
+	@Override
+	public float value(final float... in) {
+		if (in[0] >= 4) {
+			return 0;
+		}
+		in[0] = in[0] * this.sampleRate + 0.5f;
+		int i = ShaderUtils.floor(in[0]);
+		if (i >= 4 * this.sampleRate + 1) {
+			return 0;
+		}
+		return this.table[i];
+	}
+}