add ElementLayer/RenderElement prepare()

- used to prepare for compile() when all layer data is added

vtm/src/org/oscim/layers/marker/MarkerRenderer.java

@@ -162,8 +162,8 @@ public class MarkerRenderer extends ElementRenderer {
 			mSymbolLayer.pushSymbol(s);
 		}
 
-		mSymbolLayer.prepare();
 		layers.setTextureLayers(mSymbolLayer);
+		layers.prepare();
 
 		compile();
 	}

vtm/src/org/oscim/layers/tile/vector/VectorTileLoader.java

@@ -130,7 +130,11 @@ public class VectorTileLoader extends TileLoader implements IRenderTheme.Callbac
 	public void completed(QueryResult result) {
 		mTileLayer.callHooksComplete(mTile, result == QueryResult.SUCCESS);
 
+		/* finish layers - tessellate and cleanup on worker-thread */
+		mLayers.prepare();
+
 		super.completed(result);
+
 		clearState();
 	}
 

vtm/src/org/oscim/renderer/elements/BitmapLayer.java

@@ -122,11 +122,6 @@ public class BitmapLayer extends TextureLayer {
 		sbuf.put(buf);
 	}
 
-	@Override
-	public boolean prepare() {
-		return false;
-	}
-
 	@Override
 	protected void compile(ShortBuffer sbuf) {
 

vtm/src/org/oscim/renderer/elements/ElementLayers.java

@@ -365,4 +365,12 @@ public class ElementLayers extends TileData {
 
 		TextureItem.init(gl);
 	}
+
+	public void prepare() {
+		for (RenderElement l = baseLayers; l != null; l = l.next)
+			l.prepare();
+
+		for (RenderElement l = textureLayers; l != null; l = l.next)
+			l.prepare();
+	}
 }

vtm/src/org/oscim/renderer/elements/RenderElement.java

@@ -54,7 +54,15 @@ public abstract class RenderElement extends Inlist<RenderElement> {
 		numVertices = 0;
 	}
 
-	/** compile vertex data to vbo. */
+	/**
+	 * Final preparation of content before compilation
+	 * for stuff that should not be done on render-thread.
+	 */
+	protected void prepare() {
+
+	}
+
+	/** Compile vertex data to vbo. */
 	protected void compile(ShortBuffer sbuf) {
 		compileVertexItems(sbuf);
 	}

vtm/src/org/oscim/renderer/elements/SymbolLayer.java

@@ -196,9 +196,4 @@ public final class SymbolLayer extends TextureLayer {
 		super.clear();
 		clearItems();
 	}
-
-	@Override
-	public boolean prepare() {
-		return true;
-	}
 }

vtm/src/org/oscim/renderer/elements/TextLayer.java

@@ -79,7 +79,7 @@ public class TextLayer extends TextureLayer {
 	}
 
 	@Override
-	public boolean prepare() {
+	public void prepare() {
 		short numIndices = 0;
 		short offsetIndices = 0;
 		numVertices = 0;
@@ -158,8 +158,6 @@ public class TextLayer extends TextureLayer {
 
 		t.offset = offsetIndices;
 		t.indices = (short) (numIndices - offsetIndices);
-
-		return true;
 	}
 
 	protected void addItem(TextItem it,

vtm/src/org/oscim/renderer/elements/TextureLayer.java

@@ -66,7 +66,6 @@ public abstract class TextureLayer extends RenderElement {
 		compileVertexItems(sbuf);
 	}
 
-	abstract public boolean prepare();
 
 	protected void clear() {
 		while (textures != null)