nicer gl api

- java class name should suffice as namespace
- also use import static gl instance seems to work now with Gwt

vtm-web/src/org/oscim/gdx/emu/com/badlogic/gdx/backends/gwt/GwtGraphics.java

@@ -16,7 +16,7 @@
 
 package com.badlogic.gdx.backends.gwt;
 
-import org.oscim.gdx.client.GwtGLAdapter;
+import org.oscim.gdx.client.GdxGL;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -91,7 +91,7 @@ public class GwtGraphics implements Graphics {
 			log.error("Missing gl extension for WEBKIT_WEBGL_depth_texture");
 		}
 
-		this.gl = config.useDebugGL ? new GwtGL20Debug(context) : new GwtGLAdapter(context);
+		this.gl = config.useDebugGL ? new GwtGL20Debug(context) : new GdxGL(context);
 	}
 
 	public static native double getDevicePixelRatioJSNI() /*-{

vtm-web/src/org/oscim/gdx/emu/org/oscim/renderer/GLMatrix.java

@@ -17,6 +17,8 @@
 
 package org.oscim.renderer;
 
+import static org.oscim.backend.GLAdapter.gl;
+
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.nio.FloatBuffer;
@@ -295,7 +297,7 @@ public class GLMatrix {
 		buffer.clear();
 		buffer.put(val, 0, 16);
 		buffer.position(0);
-		MapRenderer.GL.glUniformMatrix4fv(location, 1, false, buffer);
+		gl.uniformMatrix4fv(location, 1, false, buffer);
 	}
 
 	/**