testing 'tessellate' jni

src/org/oscim/renderer/sublayers/MeshLayer.java

@@ -15,16 +15,65 @@
 package org.oscim.renderer.sublayers;
 
 import java.nio.ShortBuffer;
+import java.util.Arrays;
 
 import org.oscim.core.GeometryBuffer;
+import org.oscim.core.Tile;
+
+import android.util.Log;
 
 public class MeshLayer extends Layer {
+	GeometryBuffer mGeom = new GeometryBuffer(10,10);
+
+	public MeshLayer() {
+		GeometryBuffer e = mGeom;
+
+		int size = Tile.SIZE;
+
+		float x1 = -1;
+		float y1 = -1;
+		float x2 = size + 1;
+		float y2 = size + 1;
+
+		// always clear geometry before starting
+		// a different type.
+		e.clear();
+		e.startPolygon();
+		e.addPoint(x1, y1);
+		e.addPoint(x2, y1);
+		e.addPoint(x2, y2);
+		e.addPoint(x1, y2);
+
+		y1 = 5;
+		y2 = size - 5;
+		x1 = 5;
+		x2 = size - 5;
+
+		e.startHole();
+		e.addPoint(x1, y1);
+		e.addPoint(x2, y1);
+		e.addPoint(x2, y2);
+		e.addPoint(x1, y2);
+
+		addMesh(e);
+	}
 
 	public void addMesh(GeometryBuffer geom){
+		int numRings = 2;
 
-		for (int i = 0, n = geom.points.length; i < n; i++){
+		long ctx = tessellate(geom.points, 0, geom.index, 0, numRings);
 
+		short[] coordinates = new short[100];
+
+		while (tessGetCoordinates(ctx, coordinates, 2) > 0){
+			Log.d("..", Arrays.toString(coordinates));
 		}
+
+		while (tessGetIndices(ctx, coordinates) > 0){
+			Log.d("..", Arrays.toString(coordinates));
+		}
+
+		tessFinish(ctx);
 	}
 
 	@Override
@@ -37,4 +86,25 @@ public class MeshLayer extends Layer {
 
 	}
 
+	/**
+	 * @param points an array of x,y coordinates
+	 * @param pos position in points array
+	 * @param index geom indices
+	 * @param ipos position in index array
+	 * @param numRings number of rings in polygon == outer(1) + inner rings
+	 * @return number of triangles in io buffer
+	 */
+	public static native int tessellate(float[] points, int pos,
+			short[] index, int ipos, int numRings);
+
+	public static native void tessFinish(long ctx);
+
+	public static native int tessGetCoordinates(long ctx, short[] coordinates, float scale);
+
+	public static native int tessGetIndices(long ctx, short[] indices);
+
+
+	static {
+		System.loadLibrary("tessellate");
+	}
 }