diff --git a/vtm-gdx/src/org/oscim/gdx/GdxAssetAdapter.java b/vtm-gdx/src/org/oscim/gdx/GdxAssetAdapter.java
index b0119ddc..6af06f06 100644
--- a/vtm-gdx/src/org/oscim/gdx/GdxAssetAdapter.java
+++ b/vtm-gdx/src/org/oscim/gdx/GdxAssetAdapter.java
@@ -35,6 +35,7 @@ public class GdxAssetAdapter extends AssetAdapter {
 		try {
 			return file.read();
 		} catch (GdxRuntimeException e) {
+			e.printStackTrace();
 			return null;
 		}
 	}
diff --git a/vtm/resources/assets/shaders/extrusion_layer_ext.glsl b/vtm/resources/assets/shaders/extrusion_layer_ext.glsl
new file mode 100644
index 00000000..4ae42668
--- /dev/null
+++ b/vtm/resources/assets/shaders/extrusion_layer_ext.glsl
@@ -0,0 +1,59 @@
+uniform mat4 u_mvp;
+uniform vec4 u_color[4];
+uniform int u_mode;
+uniform float u_alpha;
+attribute vec4 a_pos;
+attribute vec2 a_light;
+varying vec4 color;
+varying float depth;
+const float ff = 255.0;
+void
+main(){
+  //   change height by u_alpha
+  gl_Position = u_mvp * vec4(a_pos.xy, a_pos.z * u_alpha, 1.0);
+  //  depth = gl_Position.z;
+  if (u_mode == -1) {
+    ;
+    //     roof / depth pass
+    //    color = u_color[0] * u_alpha;
+  }
+  else if (u_mode == 0) {
+    //     roof / depth pass
+    color = u_color[0] * u_alpha;
+  }
+  else if (u_mode == 1) {
+    //     sides 1 - use 0xff00
+    //     scale direction to -0.5<>0.5
+    float dir = a_light.y / ff;
+    float z = (0.98 + gl_Position.z * 0.02);
+    float h = 0.9 + clamp(a_pos.z / 2000.0, 0.0, 0.1);
+    color = u_color[1];
+    color.rgb *= (0.8 + dir * 0.2) * z * h;
+    color *= u_alpha;
+  }
+  else if (u_mode == 2) {
+    //     sides 2 - use 0x00ff
+    float dir = a_light.x / ff;
+    float z = (0.98 + gl_Position.z * 0.02);
+    float h = 0.9 + clamp(a_pos.z / 2000.0, 0.0, 0.1);
+    color = u_color[2];
+    color.rgb *= (0.8 + dir * 0.2) * z * h;
+    color *= u_alpha;
+  }
+  else if (u_mode == 3) {
+    //     outline
+    float z = (0.98 - gl_Position.z * 0.02);
+    color = u_color[3] * z;
+  }
+}
+
+$$
+
+#ifdef GLES
+precision mediump float;
+#endif
+varying vec4 color;
+void
+main(){
+  gl_FragColor = color;
+}
diff --git a/vtm/resources/assets/shaders/extrusion_layer_mesh.glsl b/vtm/resources/assets/shaders/extrusion_layer_mesh.glsl
new file mode 100644
index 00000000..34db13b1
--- /dev/null
+++ b/vtm/resources/assets/shaders/extrusion_layer_mesh.glsl
@@ -0,0 +1,50 @@
+uniform mat4 u_mvp;
+uniform vec4 u_color;
+uniform float u_alpha;
+attribute vec4 a_pos;
+attribute vec2 a_light;
+varying vec4 color;
+varying float depth;
+const float alpha = 1.0;
+void
+main(){
+  //   change height by u_alpha
+  vec4 pos = a_pos;
+  pos.z *= u_alpha;
+  gl_Position = u_mvp * pos;
+  //   normalize face x/y direction
+  vec2 enc = (a_light / 255.0);
+  vec2 fenc = enc * 4.0 - 2.0;
+  float f = dot(fenc, fenc);
+  float g = sqrt(1.0 - f / 4.0);
+  vec3 r_norm;
+  r_norm.xy = fenc * g;
+  r_norm.z = 1.0 - f / 2.0;
+  //     normal points up or down (1,-1)
+  ////    float dir = 1.0 - (2.0 * abs(mod(a_light.x,2.0)));
+  //     recreate face normal vector
+  ///    vec3 r_norm = vec3(n.xy, dir * (1.0 - length(n.xy)));
+  vec3 light_dir = normalize(vec3(0.2, 0.2, 1.0));
+  float l = dot(r_norm, light_dir) * 0.8;
+
+  light_dir = normalize(vec3(-0.2, -0.2, 1.0));
+  l += dot(r_norm, light_dir) * 0.2;
+
+  //  l = (l + (1.0 - r_norm.z))*0.5;
+  l = 0.4 + l * 0.6;
+
+  // extreme fake-ssao by height
+  l += (clamp(a_pos.z / 2048.0, 0.0, 0.1) - 0.05);
+  color = vec4(u_color.rgb * (clamp(l, 0.0, 1.0) * alpha), u_color.a * alpha);
+}
+
+$$
+
+#ifdef GLES
+precision mediump float;
+#endif
+varying vec4 color;
+void
+main(){
+  gl_FragColor = color;
+}
diff --git a/vtm/resources/assets/shaders/line_aa.glsl b/vtm/resources/assets/shaders/line_aa.glsl
new file mode 100644
index 00000000..64b06bd2
--- /dev/null
+++ b/vtm/resources/assets/shaders/line_aa.glsl
@@ -0,0 +1,61 @@
+#ifndef DESKTOP_QUIRKS
+precision mediump float;
+#endif
+uniform mat4 u_mvp;
+// uniform mat4 u_vp;
+// factor to increase line width relative to scale
+uniform float u_width;
+// xy hold position, zw extrusion vector
+attribute vec4 a_pos;
+uniform float u_mode;
+uniform float u_height;
+varying vec2 v_st;
+void
+main(){
+
+  // scale extrusion to u_width pixel
+  // just ignore the two most insignificant bits.
+  vec2 dir = a_pos.zw;
+  gl_Position = u_mvp * vec4(a_pos.xy + (u_width * dir), u_height, 1.0);
+
+  // last two bits hold the texture coordinates.
+  v_st = abs(mod(dir, 4.0)) - 1.0;
+}
+$$
+#ifndef DESKTOP_QUIRKS
+precision mediump float;
+#endif
+uniform sampler2D tex;
+uniform float u_fade;
+uniform float u_mode;
+uniform vec4 u_color;
+varying vec2 v_st;
+void
+main(){
+  float len;
+  if (u_mode == 2.0) {
+    // round cap line
+#ifdef DESKTOP_QUIRKS
+    len = length(v_st);
+#else
+    len = texture2D(tex, v_st).a;
+#endif
+  }
+  else {
+    // flat cap line
+    len = abs(v_st.s);
+  }
+  // Antialias line-edges:
+  // - 'len' is 0 at center of line. -> (1.0 - len) is 0 at the
+  // edges
+  // - 'u_fade' is 'pixel' / 'width', i.e. the inverse width of
+  // the
+  // line in pixel on screen.
+  // - 'pixel' is 1.5 / relativeScale
+  // - '(1.0 - len) / u_fade' interpolates the 'pixel' on
+  // line-edge
+  // between 0 and 1 (it is greater 1 for all inner pixel).
+  gl_FragColor = u_color * clamp((1.0 - len) / u_fade, 0.0, 1.0);
+  // -> nicer for thin lines
+  //  gl_FragColor = u_color * clamp((1.0 - (len * len)) / u_fade, 0.0, 1.0);
+}
diff --git a/vtm/resources/assets/shaders/line_aa_proj.glsl b/vtm/resources/assets/shaders/line_aa_proj.glsl
new file mode 100644
index 00000000..e2dfb095
--- /dev/null
+++ b/vtm/resources/assets/shaders/line_aa_proj.glsl
@@ -0,0 +1,60 @@
+#ifndef DESKTOP_QUIRKS
+precision mediump float;
+#endif
+uniform mat4 u_mvp;
+// uniform mat4 u_vp;
+// factor to increase line width relative to scale
+uniform float u_width;
+// xy hold position, zw extrusion vector
+attribute vec4 a_pos;
+uniform float u_mode;
+uniform float u_height;
+varying vec2 v_st;
+void
+main(){
+
+  // scale extrusion to u_width pixel
+  // just ignore the two most insignificant bits.
+  vec2 dir = a_pos.zw;
+  gl_Position = u_mvp * vec4(a_pos.xy + (u_width * dir), u_height, 1.0);
+
+  // last two bits hold the texture coordinates.
+  v_st = abs(mod(dir, 4.0)) - 1.0;
+}
+$$
+#extension GL_OES_standard_derivatives : enable
+#ifndef DESKTOP_QUIRKS
+precision mediump float;
+#endif
+uniform sampler2D tex;
+uniform float u_mode;
+uniform vec4 u_color;
+uniform float u_fade;
+varying vec2 v_st;
+void
+main(){
+  float len;
+  float fuzz;
+  if (u_mode == 2.0) {
+    /* round cap line */
+#ifdef DESKTOP_QUIRKS
+    len = length(v_st);
+#else
+    len = texture2D(tex, v_st).a;
+#endif
+    vec2 st_width = fwidth(v_st);
+    fuzz = max(st_width.s, st_width.t);
+  }
+  else {
+    /* flat cap line */
+    len = abs(v_st.s);
+    fuzz = fwidth(v_st.s);
+  }
+  // u_mode == 0.0 -> thin line
+  //  len = len * clamp(u_mode, len, 1.0);
+  if (fuzz > 2.0)
+    gl_FragColor = u_color * 0.5;
+  else
+    gl_FragColor = u_color * clamp((1.0 - len) / max(u_fade, fuzz), 0.0, 1.0);
+//  gl_FragColor = u_color * clamp((1.0 - len), 0.0, 1.0);
+}
diff --git a/vtm/resources/assets/shaders/poly_texture.glsl b/vtm/resources/assets/shaders/poly_texture.glsl
new file mode 100644
index 00000000..01c5d144
--- /dev/null
+++ b/vtm/resources/assets/shaders/poly_texture.glsl
@@ -0,0 +1,22 @@
+precision mediump float;
+uniform mat4 u_mvp;
+uniform vec2 u_scale;
+attribute vec4 a_pos;
+varying vec2 v_st;
+varying vec2 v_st2;
+void main() {
+	v_st = clamp(a_pos.xy, 0.0, 1.0) * (2.0 / u_scale.y);
+	v_st2 = clamp(a_pos.xy, 0.0, 1.0) * (4.0 / u_scale.y);
+	gl_Position = u_mvp * a_pos;
+}
+
+§
+precision mediump float;
+uniform vec4 u_color;
+uniform sampler2D tex;
+uniform vec2 u_scale;
+varying vec2 v_st;
+varying vec2 v_st2;
+void main() {
+	gl_FragColor = mix(texture2D(tex, v_st), texture2D(tex, v_st2), u_scale.x);
+}
diff --git a/vtm/resources/assets/shaders/simple_shader.glsl b/vtm/resources/assets/shaders/simple_shader.glsl
new file mode 100644
index 00000000..174ce389
--- /dev/null
+++ b/vtm/resources/assets/shaders/simple_shader.glsl
@@ -0,0 +1,13 @@
+precision mediump float;
+uniform mat4 u_mvp;
+attribute vec4 a_pos;
+void main() {
+	gl_Position = u_mvp * a_pos;
+}
+§
+precision mediump float;
+uniform vec4 u_color;
+void main() {
+	gl_FragColor = u_color;
+}
+
diff --git a/vtm/resources/assets/shaders/texture_layer.glsl b/vtm/resources/assets/shaders/texture_layer.glsl
new file mode 100644
index 00000000..169d7a4d
--- /dev/null
+++ b/vtm/resources/assets/shaders/texture_layer.glsl
@@ -0,0 +1,37 @@
+#ifdef GLES
+precision highp float;
+#endif
+attribute vec4 vertex;
+attribute vec2 tex_coord;
+uniform mat4 u_mv;
+uniform mat4 u_proj;
+uniform float u_scale;
+uniform vec2 u_div;
+varying vec2 tex_c;
+const float coord_scale = 1.0/8.0;
+void
+main(){
+  vec4 pos;
+  vec2 dir = vertex.zw;
+  if (mod(vertex.x, 2.0) == 0.0) {
+    pos = u_proj * (u_mv * vec4(vertex.xy + dir * u_scale, 0.0, 1.0));
+  }
+  else { // place as billboard
+    vec4 center = u_mv * vec4(vertex.xy, 0.0, 1.0);
+    pos = u_proj * (center + vec4(dir * coord_scale, 0.0, 0.0));
+  }
+  gl_Position = pos;
+  tex_c = tex_coord * u_div;
+}
+
+$$
+
+#ifdef GLES
+precision highp float;
+#endif
+uniform sampler2D tex;
+varying vec2 tex_c;
+void
+main(){
+  gl_FragColor = texture2D(tex, tex_c.xy);
+}
diff --git a/vtm/src/org/oscim/backend/AssetAdapter.java b/vtm/src/org/oscim/backend/AssetAdapter.java
index 33d06845..ce6fa3f7 100644
--- a/vtm/src/org/oscim/backend/AssetAdapter.java
+++ b/vtm/src/org/oscim/backend/AssetAdapter.java
@@ -16,7 +16,10 @@
  */
 package org.oscim.backend;
 
+import java.io.BufferedReader;
+import java.io.IOException;
 import java.io.InputStream;
+import java.io.InputStreamReader;
 
 /**
  * The Class AssetAdapter.
@@ -33,4 +36,25 @@ public abstract class AssetAdapter {
 	 * @return the input stream
 	 */
 	public abstract InputStream openFileAsStream(String name);
+
+	public String openTextFile(String name) {
+		StringBuilder sb = new StringBuilder();
+
+		InputStream is = g.openFileAsStream(name);
+		if (is == null)
+			return null;
+
+		BufferedReader r = new BufferedReader(new InputStreamReader(is));
+		String line;
+		try {
+			while ((line = r.readLine()) != null) {
+				sb.append(line);
+				sb.append('\n');
+			}
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+
+		return sb.toString();
+	}
 }
diff --git a/vtm/src/org/oscim/renderer/GLShader.java b/vtm/src/org/oscim/renderer/GLShader.java
new file mode 100644
index 00000000..61e06cf8
--- /dev/null
+++ b/vtm/src/org/oscim/renderer/GLShader.java
@@ -0,0 +1,129 @@
+package org.oscim.renderer;
+
+import java.nio.IntBuffer;
+
+import org.oscim.backend.AssetAdapter;
+import org.oscim.backend.GL20;
+import org.oscim.backend.GLAdapter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public abstract class GLShader {
+	final static Logger log = LoggerFactory.getLogger(GLShader.class);
+
+	static GL20 GL;
+
+	public int program;
+
+	protected boolean create(String vertexSource, String fragmentSource) {
+		program = createProgram(vertexSource, fragmentSource);
+		return program != 0;
+	}
+
+	protected boolean create(String fileName) {
+		program = loadShader(fileName);
+		return program != 0;
+	}
+
+	protected int getAttrib(String name) {
+		int loc = GL.glGetAttribLocation(program, name);
+		if (loc < 0)
+			log.debug("missing attribute: {}", name);
+		return loc;
+	}
+
+	protected int getUniform(String name) {
+		int loc = GL.glGetUniformLocation(program, name);
+		if (loc < 0)
+			log.debug("missing uniform: {}", name);
+		return loc;
+	}
+
+	public boolean useProgram() {
+		return GLState.useProgram(program);
+	}
+
+	public static int loadShader(String file) {
+		String path = "shaders/" + file + ".glsl";
+		String vs = AssetAdapter.g.openTextFile(path);
+
+		if (vs == null)
+			throw new IllegalArgumentException("shader file not found: " + path);
+
+		// TODO ...
+		int fsStart = vs.indexOf('$');
+		if (fsStart < 0 || vs.charAt(fsStart + 1) != '$')
+			throw new IllegalArgumentException("not a shader file " + path);
+
+		String fs = vs.substring(fsStart + 2);
+		vs = vs.substring(0, fsStart);
+
+		int shader = createProgram(vs, fs);
+		if (shader == 0) {
+			System.out.println(vs + " \n\n" + fs);
+		}
+		return shader;
+	}
+
+	public static int loadShader(int shaderType, String source) {
+
+		int shader = GL.glCreateShader(shaderType);
+		if (shader != 0) {
+			GL.glShaderSource(shader, source);
+			GL.glCompileShader(shader);
+			IntBuffer compiled = MapRenderer.getIntBuffer(1);
+
+			GL.glGetShaderiv(shader, GL20.GL_COMPILE_STATUS, compiled);
+			compiled.position(0);
+			if (compiled.get() == 0) {
+				log.error("Could not compile shader " + shaderType + ":");
+				log.error(GL.glGetShaderInfoLog(shader));
+				GL.glDeleteShader(shader);
+				shader = 0;
+			}
+		}
+		return shader;
+	}
+
+	public static int createProgram(String vertexSource, String fragmentSource) {
+		String defs = "";
+		if (GLAdapter.GDX_DESKTOP_QUIRKS)
+			defs += "#define DESKTOP_QUIRKS 1\n";
+		else
+			defs += "#define GLES 1\n";
+
+		int vertexShader = loadShader(GL20.GL_VERTEX_SHADER, defs + vertexSource);
+		if (vertexShader == 0) {
+			return 0;
+		}
+
+		int pixelShader = loadShader(GL20.GL_FRAGMENT_SHADER, defs + fragmentSource);
+		if (pixelShader == 0) {
+			return 0;
+		}
+
+		int program = GL.glCreateProgram();
+		if (program != 0) {
+			GLUtils.checkGlError("glCreateProgram");
+			GL.glAttachShader(program, vertexShader);
+			GLUtils.checkGlError("glAttachShader");
+			GL.glAttachShader(program, pixelShader);
+			GLUtils.checkGlError("glAttachShader");
+			GL.glLinkProgram(program);
+			IntBuffer linkStatus = MapRenderer.getIntBuffer(1);
+			GL.glGetProgramiv(program, GL20.GL_LINK_STATUS, linkStatus);
+			linkStatus.position(0);
+			if (linkStatus.get() != GL20.GL_TRUE) {
+				log.error("Could not link program: ");
+				log.error(GL.glGetProgramInfoLog(program));
+				GL.glDeleteProgram(program);
+				program = 0;
+			}
+		}
+		return program;
+	}
+
+	public static class SimpleShader {
+
+	}
+}
diff --git a/vtm/src/org/oscim/renderer/MapRenderer.java b/vtm/src/org/oscim/renderer/MapRenderer.java
index 02c748e7..68ea493b 100644
--- a/vtm/src/org/oscim/renderer/MapRenderer.java
+++ b/vtm/src/org/oscim/renderer/MapRenderer.java
@@ -324,6 +324,7 @@ public class MapRenderer {
 
 		GLState.init(GL);
 		GLUtils.init(GL);
+		GLShader.GL = GL;
 
 		// Set up some vertex buffer objects
 		BufferObject.init(GL, 200);
diff --git a/vtm/src/org/oscim/renderer/elements/PolygonLayer.java b/vtm/src/org/oscim/renderer/elements/PolygonLayer.java
index 0eed9f1e..4ca4ac79 100644
--- a/vtm/src/org/oscim/renderer/elements/PolygonLayer.java
+++ b/vtm/src/org/oscim/renderer/elements/PolygonLayer.java
@@ -21,7 +21,6 @@ import java.nio.ByteOrder;
 import java.nio.FloatBuffer;
 
 import org.oscim.backend.GL20;
-import org.oscim.backend.GLAdapter;
 import org.oscim.core.GeometryBuffer;
 import org.oscim.core.Tile;
 import org.oscim.renderer.GLMatrix;
@@ -145,16 +144,11 @@ public final class PolygonLayer extends RenderElement {
 
 				// Set up the program for rendering polygons
 				if (i == 0) {
-					if (GLAdapter.debugView)
-						polygonProgram[i] = GLUtils.createProgram(polygonVertexShaderZ,
-						                                          polygonFragmentShaderZ);
-					else
-						polygonProgram[i] = GLUtils.createProgram(polygonVertexShader,
-						                                          polygonFragmentShader);
+					polygonProgram[i] = ShaderProgram.loadShader("simple_shader");
+					//polygonProgram[i] = GLUtils.createProgram(polygonVertexShader,
+					//                                         polygonFragmentShader);
 				} else if (i == 1) {
-					polygonProgram[i] = GLUtils.createProgram(textureVertexShader,
-					                                          textureFragmentShader);
-
+					polygonProgram[i] = ShaderProgram.loadShader("poly_texture");
 				}
 
 				if (polygonProgram[i] == 0) {
@@ -482,68 +476,68 @@ public final class PolygonLayer extends RenderElement {
 			GLUtils.checkGlError("draw debug");
 		}
 
-		private final static String polygonVertexShader = ""
-		        + "precision mediump float;"
-		        + "uniform mat4 u_mvp;"
-		        + "attribute vec4 a_pos;"
-		        + "void main() {"
-		        + "  gl_Position = u_mvp * a_pos;"
-		        + "}";
+		//		private final static String polygonVertexShader = ""
+		//		        + "precision mediump float;"
+		//		        + "uniform mat4 u_mvp;"
+		//		        + "attribute vec4 a_pos;"
+		//		        + "void main() {"
+		//		        + "  gl_Position = u_mvp * a_pos;"
+		//		        + "}";
+		//
+		//		private final static String polygonFragmentShader = ""
+		//		        + "precision mediump float;"
+		//		        + "uniform vec4 u_color;"
+		//		        + "void main() {"
+		//		        + "  gl_FragColor = u_color;"
+		//		        + "}";
 
-		private final static String polygonFragmentShader = ""
-		        + "precision mediump float;"
-		        + "uniform vec4 u_color;"
-		        + "void main() {"
-		        + "  gl_FragColor = u_color;"
-		        + "}";
+		//		private final static String polygonVertexShaderZ = ""
+		//		        + "precision highp float;"
+		//		        + "uniform mat4 u_mvp;"
+		//		        + "attribute vec4 a_pos;"
+		//		        + "varying float z;"
+		//		        + "void main() {"
+		//		        + "  gl_Position = u_mvp * a_pos;"
+		//		        + "  z = gl_Position.z;"
+		//		        + "}";
+		//		private final static String polygonFragmentShaderZ = ""
+		//		        + "precision highp float;"
+		//		        + "uniform vec4 u_color;"
+		//		        + "varying float z;"
+		//		        + "void main() {"
+		//		        + "if (z < -1.0)"
+		//		        + "  gl_FragColor = vec4(0.0, z + 2.0, 0.0, 1.0)*0.8;"
+		//		        + "else if (z < 0.0)"
+		//		        + "  gl_FragColor = vec4(z + 1.0, 0.0, 0.0, 1.0)*0.8;"
+		//		        + "else if (z < 1.0)"
+		//		        + "  gl_FragColor = vec4(0.0, 0.0, z, 1.0)*0.8;"
+		//		        + "else"
+		//		        + "  gl_FragColor = vec4(0.0, z - 1.0, 0.0, 1.0)*0.8;"
+		//		        + "}";
 
-		private final static String polygonVertexShaderZ = ""
-		        + "precision highp float;"
-		        + "uniform mat4 u_mvp;"
-		        + "attribute vec4 a_pos;"
-		        + "varying float z;"
-		        + "void main() {"
-		        + "  gl_Position = u_mvp * a_pos;"
-		        + "  z = gl_Position.z;"
-		        + "}";
-		private final static String polygonFragmentShaderZ = ""
-		        + "precision highp float;"
-		        + "uniform vec4 u_color;"
-		        + "varying float z;"
-		        + "void main() {"
-		        + "if (z < -1.0)"
-		        + "  gl_FragColor = vec4(0.0, z + 2.0, 0.0, 1.0)*0.8;"
-		        + "else if (z < 0.0)"
-		        + "  gl_FragColor = vec4(z + 1.0, 0.0, 0.0, 1.0)*0.8;"
-		        + "else if (z < 1.0)"
-		        + "  gl_FragColor = vec4(0.0, 0.0, z, 1.0)*0.8;"
-		        + "else"
-		        + "  gl_FragColor = vec4(0.0, z - 1.0, 0.0, 1.0)*0.8;"
-		        + "}";
-
-		private final static String textureVertexShader = ""
-		        + "precision mediump float;"
-		        + "uniform mat4 u_mvp;"
-		        + "uniform vec2 u_scale;"
-		        + "attribute vec4 a_pos;"
-		        + "varying vec2 v_st;"
-		        + "varying vec2 v_st2;"
-		        + "void main() {"
-		        + "  v_st = clamp(a_pos.xy, 0.0, 1.0) * (2.0 / u_scale.y);"
-		        + "  v_st2 = clamp(a_pos.xy, 0.0, 1.0) * (4.0 / u_scale.y);"
-		        + "  gl_Position = u_mvp * a_pos;"
-		        + "}";
-
-		private final static String textureFragmentShader = ""
-		        + "precision mediump float;"
-		        + "uniform vec4 u_color;"
-		        + "uniform sampler2D tex;"
-		        + "uniform vec2 u_scale;"
-		        + "varying vec2 v_st;"
-		        + "varying vec2 v_st2;"
-		        + "void main() {"
-		        + "  gl_FragColor = mix(texture2D(tex, v_st), texture2D(tex, v_st2), u_scale.x);"
-		        + "}";
+		//		private final static String textureVertexShader = ""
+		//		        + "precision mediump float;"
+		//		        + "uniform mat4 u_mvp;"
+		//		        + "uniform vec2 u_scale;"
+		//		        + "attribute vec4 a_pos;"
+		//		        + "varying vec2 v_st;"
+		//		        + "varying vec2 v_st2;"
+		//		        + "void main() {"
+		//		        + "  v_st = clamp(a_pos.xy, 0.0, 1.0) * (2.0 / u_scale.y);"
+		//		        + "  v_st2 = clamp(a_pos.xy, 0.0, 1.0) * (4.0 / u_scale.y);"
+		//		        + "  gl_Position = u_mvp * a_pos;"
+		//		        + "}";
+		//
+		//		private final static String textureFragmentShader = ""
+		//		        + "precision mediump float;"
+		//		        + "uniform vec4 u_color;"
+		//		        + "uniform sampler2D tex;"
+		//		        + "uniform vec2 u_scale;"
+		//		        + "varying vec2 v_st;"
+		//		        + "varying vec2 v_st2;"
+		//		        + "void main() {"
+		//		        + "  gl_FragColor = mix(texture2D(tex, v_st), texture2D(tex, v_st2), u_scale.x);"
+		//		        + "}";
 	}
 
 }