From f442395a1180974bab1754f1c41e7eada8dd5476 Mon Sep 17 00:00:00 2001
From: Hannes Janetzek <hannes.janetzek@gmail.com>
Date: Thu, 31 Jan 2013 05:43:08 +0100
Subject: [PATCH] clear stencil after each tile

---
 src/org/oscim/renderer/BaseMap.java         | 13 +++++++++++--
 src/org/oscim/renderer/PolygonRenderer.java | 11 +++++++++--
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/src/org/oscim/renderer/BaseMap.java b/src/org/oscim/renderer/BaseMap.java
index a951a524..c24669ad 100644
--- a/src/org/oscim/renderer/BaseMap.java
+++ b/src/org/oscim/renderer/BaseMap.java
@@ -16,6 +16,7 @@ package org.oscim.renderer;
 
 import static android.opengl.GLES20.GL_ARRAY_BUFFER;
 import static android.opengl.GLES20.GL_BLEND;
+import static android.opengl.GLES20.glStencilMask;
 import static org.oscim.generator.JobTile.STATE_READY;
 
 import org.oscim.core.MapPosition;
@@ -54,8 +55,9 @@ public class BaseMap {
 		mDrawCnt = 0;
 
 		GLES20.glDepthFunc(GLES20.GL_LESS);
-
+		glStencilMask(0xFF);
 		LineRenderer.beginLines();
+
 		for (int i = 0; i < tileCnt; i++) {
 			MapTile t = tiles[i];
 			if (t.isVisible && t.state == STATE_READY)
@@ -79,6 +81,7 @@ public class BaseMap {
 		}
 
 		LineRenderer.endLines();
+		glStencilMask(0x0);
 
 		//long end = SystemClock.uptimeMillis();
 		//Log.d(TAG, "base took " + (end - start));
@@ -144,7 +147,13 @@ public class BaseMap {
 					break;
 			}
 		}
-		PolygonRenderer.drawOver(mvp);
+
+		glStencilMask(0xFF);
+		GLES20.glClear(GLES20.GL_STENCIL_BUFFER_BIT);
+		//glStencilMask(0x0);
+
+		//PolygonRenderer.drawOver(mvp);
+		//GLES20.glFlush();
 	}
 
 	private static int drawProxyChild(MapTile tile, MapPosition pos) {
diff --git a/src/org/oscim/renderer/PolygonRenderer.java b/src/org/oscim/renderer/PolygonRenderer.java
index 6f707c56..9014e021 100644
--- a/src/org/oscim/renderer/PolygonRenderer.java
+++ b/src/org/oscim/renderer/PolygonRenderer.java
@@ -243,14 +243,20 @@ public final class PolygonRenderer {
 		return l;
 	}
 
+	/**
+	 * @param clip ...
+	 * @param first ...
+	 */
 	static void drawStencilRegion(boolean clip, boolean first) {
 		GLState.useProgram(polygonProgram);
 
 		// disable drawing to framebuffer (will be re-enabled in fill)
 		glColorMask(false, false, false, false);
 
-		// write to all bits
-		glStencilMask(0xFF);
+		if (!first) {
+			// write to all bits 
+			glStencilMask(0xFF);
+		}
 
 		// set clip bit (0x80) for draw region
 		glStencilOp(GLES20.GL_KEEP, GLES20.GL_KEEP, GLES20.GL_REPLACE);
@@ -295,6 +301,7 @@ public final class PolygonRenderer {
 	}
 
 	static void drawOver(float[] matrix) {
+
 		GLState.useProgram(polygonProgram);
 
 		GLState.enableVertexArrays(hPolygonVertexPosition, -1);