1 files changed, 113 insertions, 0 deletions
diff --git a/engine/src/terrain/com/jme3/terrain/noise/filter/OptimizedErode.java b/engine/src/terrain/com/jme3/terrain/noise/filter/OptimizedErode.java
new file mode 100644
index 0000000..fc20da6
--- /dev/null
+++ b/engine/src/terrain/com/jme3/terrain/noise/filter/OptimizedErode.java
@@ -0,0 +1,113 @@
+/**
+ * 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 OptimizedErode extends AbstractFilter {
+
+	private float talus;
+	private int radius;
+
+	public OptimizedErode setRadius(int radius) {
+		this.radius = radius;
+		return this;
+	}
+
+	public int getRadius() {
+		return this.radius;
+	}
+
+	public OptimizedErode setTalus(float talus) {
+		this.talus = talus;
+		return this;
+	}
+
+	public float getTalus() {
+		return this.talus;
+	}
+
+	@Override
+	public int getMargin(int size, int margin) {
+		return super.getMargin(size, margin) + this.radius;
+	}
+
+	@Override
+	public FloatBuffer filter(float sx, float sy, float base, FloatBuffer buffer, int size) {
+		float[] tmp = buffer.array();
+		float[] retval = new float[tmp.length];
+
+		for (int y = this.radius + 1; y < size - this.radius; y++) {
+			for (int x = this.radius + 1; x < size - this.radius; x++) {
+				int idx = y * size + x;
+				float h = tmp[idx];
+
+				float horizAvg = 0;
+				int horizCount = 0;
+				float vertAvg = 0;
+				int vertCount = 0;
+
+				boolean horizT = false;
+				boolean vertT = false;
+
+				for (int i = 0; i >= -this.radius; i--) {
+					int idxV = (y + i) * size + x;
+					int idxVL = (y + i - 1) * size + x;
+					int idxH = y * size + x + i;
+					int idxHL = y * size + x + i - 1;
+					float hV = tmp[idxV];
+					float hH = tmp[idxH];
+
+					if (Math.abs(h - hV) > this.talus && Math.abs(h - tmp[idxVL]) > this.talus || vertT) {
+						vertT = true;
+					} else {
+						if (Math.abs(h - hV) <= this.talus) {
+							vertAvg += hV;
+							vertCount++;
+						}
+					}
+
+					if (Math.abs(h - hH) > this.talus && Math.abs(h - tmp[idxHL]) > this.talus || horizT) {
+						horizT = true;
+					} else {
+						if (Math.abs(h - hH) <= this.talus) {
+							horizAvg += hH;
+							horizCount++;
+						}
+					}
+				}
+
+				retval[idx] = 0.5f * (vertAvg / (vertCount > 0 ? vertCount : 1) + horizAvg / (horizCount > 0 ? horizCount : 1));
+			}
+		}
+		return FloatBuffer.wrap(retval);
+	}
+
+}