1 files changed, 101 insertions, 0 deletions
diff --git a/engine/src/terrain/com/jme3/terrain/noise/filter/ThermalErodeFilter.java b/engine/src/terrain/com/jme3/terrain/noise/filter/ThermalErodeFilter.java
new file mode 100644
index 0000000..2e49679
--- /dev/null
+++ b/engine/src/terrain/com/jme3/terrain/noise/filter/ThermalErodeFilter.java
@@ -0,0 +1,101 @@
+/**
+ * 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.filter;
+
+import java.nio.FloatBuffer;
+
+public class ThermalErodeFilter extends AbstractFilter {
+
+	private float talus;
+	private float c;
+
+	public ThermalErodeFilter setC(float c) {
+		this.c = c;
+		return this;
+	}
+
+	public ThermalErodeFilter setTalus(float talus) {
+		this.talus = talus;
+		return this;
+	}
+
+	@Override
+	public int getMargin(int size, int margin) {
+		return super.getMargin(size, margin) + 1;
+	}
+
+	@Override
+	public FloatBuffer filter(float sx, float sy, float base, FloatBuffer buffer, int workSize) {
+		float[] ga = buffer.array();
+		float[] sa = new float[workSize * workSize];
+
+		int[] idxrel = { -workSize - 1, -workSize + 1, workSize - 1, workSize + 1 };
+
+		for (int y = 0; y < workSize; y++) {
+			for (int x = 0; x < workSize; x++) {
+				int idx = y * workSize + x;
+				ga[idx] += sa[idx];
+				sa[idx] = 0;
+
+				float[] deltas = new float[idxrel.length];
+				float deltaMax = this.talus;
+				float deltaTotal = 0;
+
+				for (int j = 0; j < idxrel.length; j++) {
+					if (idx + idxrel[j] > 0 && idx + idxrel[j] < ga.length) {
+						float dj = ga[idx] - ga[idx + idxrel[j]];
+						if (dj > this.talus) {
+							deltas[j] = dj;
+							deltaTotal += dj;
+							if (dj > deltaMax) {
+								deltaMax = dj;
+							}
+						}
+					}
+				}
+
+				for (int j = 0; j < idxrel.length; j++) {
+					if (deltas[j] != 0) {
+						float d = this.c * (deltaMax - this.talus) * deltas[j] / deltaTotal;
+						if (d > ga[idx] + sa[idx]) {
+							d = ga[idx] + sa[idx];
+						}
+						sa[idx] -= d;
+						sa[idx + idxrel[j]] += d;
+					}
+					deltas[j] = 0;
+				}
+			}
+		}
+
+		return buffer;
+	}
+
+}