ShaderState: Add 'ownUniform()/ownAttribute()'; rename glFunction -> function; switch program enh. ; Graph lifecycle

Add 'ownUniform()/ownAttribute()' allowing to reset all bound uniforms/attributes,
not just active ones plus handling the lifecycle of the owned attributes (destroy).
This simplifies the lifecycle of all shader attributes.

Rename glFunction -> function .. well, the GL attribute marks them GL related already

Switch program enhancement. If switching to new program (unlinked), issue glBindAttributeLocation ..

Graph lifecycle cleanup using the above ..

8 files changed, 344 insertions, 258 deletions

diff --git a/src/jogl/classes/com/jogamp/graph/curve/Region.java b/src/jogl/classes/com/jogamp/graph/curve/Region.java
index a759546ba..eb88b787c 100755
--- a/src/jogl/classes/com/jogamp/graph/curve/Region.java
+++ b/src/jogl/classes/com/jogamp/graph/curve/Region.java
@@ -117,7 +117,7 @@ public interface Region {
     /** Delete and clean the associated OGL

      *  objects

      */

-    public void destroy(GL2ES2 gl);

+    public void destroy(GL2ES2 gl, RenderState rs);

     

     public AABBox getBounds(); 

     

diff --git a/src/jogl/classes/com/jogamp/graph/curve/opengl/RegionRenderer.java b/src/jogl/classes/com/jogamp/graph/curve/opengl/RegionRenderer.java
index 2b4c8b7c5..69fdd5c4a 100644
--- a/src/jogl/classes/com/jogamp/graph/curve/opengl/RegionRenderer.java
+++ b/src/jogl/classes/com/jogamp/graph/curve/opengl/RegionRenderer.java
@@ -79,7 +79,7 @@ public abstract class RegionRenderer extends Renderer {
         Iterator<Region> iterator = regions.values().iterator();
         while(iterator.hasNext()){
             Region region = iterator.next();
-            region.destroy(gl);
+            region.destroy(gl, rs);
         }
         regions.clear();
     }       
diff --git a/src/jogl/classes/com/jogamp/graph/curve/opengl/RenderState.java b/src/jogl/classes/com/jogamp/graph/curve/opengl/RenderState.java
index 6450f9f8b..84323f6e5 100644
--- a/src/jogl/classes/com/jogamp/graph/curve/opengl/RenderState.java
+++ b/src/jogl/classes/com/jogamp/graph/curve/opengl/RenderState.java
@@ -27,29 +27,28 @@
  */
 package com.jogamp.graph.curve.opengl;
 
-import javax.media.opengl.GL;
-import javax.media.opengl.GLProfile;
+import javax.media.opengl.GL2ES2;
 import javax.media.opengl.GLUniformData;
 
-import com.jogamp.common.os.Platform;
-import com.jogamp.common.util.VersionUtil;
 import com.jogamp.graph.geom.Vertex;
 import com.jogamp.opengl.util.PMVMatrix;
 import com.jogamp.opengl.util.glsl.ShaderState;
 
 public interface RenderState {
     
+    void destroy(GL2ES2 gl);
+    
     ShaderState getShaderState();
     Vertex.Factory<? extends Vertex> getPointFactory();
-    PMVMatrix getPMVMatrix();
-    GLUniformData getPMVMatrixUniform();
+    PMVMatrix pmvMatrix();
+    GLUniformData getPMVMatrix();
     GLUniformData getSharpness();
     GLUniformData getAlpha();
     GLUniformData getColorStatic();
     GLUniformData getStrength();
     
-    RenderState attachTo(GL gl);
-    boolean detachFrom(GL gl);   
+    RenderState attachTo(GL2ES2 gl);
+    boolean detachFrom(GL2ES2 gl);   
     
     StringBuilder toString(StringBuilder sb);
     String toString();
diff --git a/src/jogl/classes/com/jogamp/graph/curve/opengl/Renderer.java b/src/jogl/classes/com/jogamp/graph/curve/opengl/Renderer.java
index 4db917fdd..35022f769 100644
--- a/src/jogl/classes/com/jogamp/graph/curve/opengl/Renderer.java
+++ b/src/jogl/classes/com/jogamp/graph/curve/opengl/Renderer.java
@@ -63,7 +63,7 @@ public abstract class Renderer {
    
     /** 
      * Flushes all cached data
-     * @see #dispose(GL2ES2)
+     * @see #destroy(GL2ES2)
      */
     public abstract void flushCache(GL2ES2 gl);
     
@@ -130,58 +130,59 @@ public abstract class Renderer {
         rs.attachTo(gl);
         
         gl.glEnable(GL2ES2.GL_BLEND);
-        gl.glBlendFunc(GL2ES2.GL_SRC_ALPHA, GL2ES2.GL_ONE_MINUS_SRC_ALPHA);
+        gl.glBlendFunc(GL2ES2.GL_SRC_ALPHA, GL2ES2.GL_ONE_MINUS_SRC_ALPHA); // FIXME: alpha blending stage ?
         
         initialized = initShaderProgram(gl);
         if(!initialized) {
             return false;
         }
         
-        if(!rs.getShaderState().glUniform(gl, rs.getPMVMatrixUniform())) {
+        if(!rs.getShaderState().uniform(gl, rs.getPMVMatrix())) {
             if(DEBUG){
                 System.err.println("Error setting PMVMatrix in shader: "+rs.getShaderState());
             }
             return false;
         }
         
-        if(!rs.getShaderState().glUniform(gl, rs.getSharpness())) {
+        if(!rs.getShaderState().uniform(gl, rs.getSharpness())) {
             if(DEBUG){
                 System.err.println("Error setting sharpness in shader: "+rs.getShaderState());
             }
             return false;
         }
                 
-        if(!rs.getShaderState().glUniform(gl, rs.getAlpha())) {
+        if(!rs.getShaderState().uniform(gl, rs.getAlpha())) {
             if(DEBUG){
                 System.err.println("Error setting global alpha in shader: "+rs.getShaderState());
             }
             return false;
         }        
         
-        if(!rs.getShaderState().glUniform(gl, rs.getColorStatic())) {
+        if(!rs.getShaderState().uniform(gl, rs.getColorStatic())) {
             if(DEBUG){
                 System.err.println("Error setting global color in shader: "+rs.getShaderState());
             }
             return false;
         }        
         
-        if(!rs.getShaderState().glUniform(gl, rs.getStrength())) {
+        if(!rs.getShaderState().uniform(gl, rs.getStrength())) {
             System.err.println("Error setting antialias strength in shader: "+rs.getShaderState());
         }
                 
         return initialized;
     }
 
-    public void dispose(GL2ES2 gl) {
+    public void destroy(GL2ES2 gl) {
         if(!initialized){
             if(DEBUG_INSTANCE) {
                 System.err.println("TextRenderer: Not initialized!");
             }
             return;
         }
+        rs.getShaderState().useProgram(gl, false);
         flushCache(gl);
         disposeImpl(gl);
-        rs.getShaderState().destroy(gl);
+        rs.destroy(gl);
         initialized = false;        
     }
     
@@ -189,7 +190,7 @@ public abstract class Renderer {
     public final ShaderState getShaderState() { return rs.getShaderState(); }
     
     public final void enable(GL2ES2 gl, boolean enable) { 
-        rs.getShaderState().glUseProgram(gl, enable);
+        rs.getShaderState().useProgram(gl, enable);
     }
 
     public float getSharpness() {
@@ -199,7 +200,7 @@ public abstract class Renderer {
     public void setSharpness(GL2ES2 gl, float v) {
         rs.getSharpness().setData(v);
         if(null != gl && rs.getShaderState().inUse()) {
-            rs.getShaderState().glUniform(gl, rs.getSharpness());
+            rs.getShaderState().uniform(gl, rs.getSharpness());
         }
     }
 
@@ -210,7 +211,7 @@ public abstract class Renderer {
     public void setStrength(GL2ES2 gl, float v) {
         rs.getStrength().setData(v);
         if(null != gl && rs.getShaderState().inUse()) {
-            rs.getShaderState().glUniform(gl, rs.getStrength());
+            rs.getShaderState().uniform(gl, rs.getStrength());
         }
     }
     
@@ -221,7 +222,7 @@ public abstract class Renderer {
     public void setAlpha(GL2ES2 gl, float alpha_t) {
         rs.getAlpha().setData(alpha_t);
         if(null != gl && rs.getShaderState().inUse()) {
-            rs.getShaderState().glUniform(gl, rs.getAlpha());
+            rs.getShaderState().uniform(gl, rs.getAlpha());
         }
 
     }
@@ -239,36 +240,36 @@ public abstract class Renderer {
         fb.put(1, g);
         fb.put(2, b);
         if(null != gl && rs.getShaderState().inUse()) {
-            rs.getShaderState().glUniform(gl, rs.getColorStatic());
+            rs.getShaderState().uniform(gl, rs.getColorStatic());
         }
     }
     
-    public final PMVMatrix getMatrix() { return rs.getPMVMatrix(); }
+    public final PMVMatrix getMatrix() { return rs.pmvMatrix(); }
 
     public void rotate(GL2ES2 gl, float angle, float x, float y, float z) {
-        rs.getPMVMatrix().glRotatef(angle, x, y, z);
+        rs.pmvMatrix().glRotatef(angle, x, y, z);
         updateMatrix(gl);
     }
 
     public void translate(GL2ES2 gl, float x, float y, float z) {
-        rs.getPMVMatrix().glTranslatef(x, y, z);
+        rs.pmvMatrix().glTranslatef(x, y, z);
         updateMatrix(gl);
     }
     
     public void scale(GL2ES2 gl, float x, float y, float z) {
-        rs.getPMVMatrix().glScalef(x, y, z);
+        rs.pmvMatrix().glScalef(x, y, z);
         updateMatrix(gl);
     }
 
     public void resetModelview(GL2ES2 gl) {
-        rs.getPMVMatrix().glMatrixMode(GLMatrixFunc.GL_MODELVIEW);
-        rs.getPMVMatrix().glLoadIdentity();
+        rs.pmvMatrix().glMatrixMode(GLMatrixFunc.GL_MODELVIEW);
+        rs.pmvMatrix().glLoadIdentity();
         updateMatrix(gl);
     }
 
     public void updateMatrix(GL2ES2 gl) {
         if(initialized && null != gl && rs.getShaderState().inUse()) {
-            rs.getShaderState().glUniform(gl, rs.getPMVMatrixUniform());
+            rs.getShaderState().uniform(gl, rs.getPMVMatrix());
         }
     }
 
@@ -276,7 +277,7 @@ public abstract class Renderer {
         this.vp_width = width;
         this.vp_height = height;
         final float ratio = (float)width/(float)height;
-        final PMVMatrix p = rs.getPMVMatrix();
+        final PMVMatrix p = rs.pmvMatrix();
         p.glMatrixMode(GLMatrixFunc.GL_PROJECTION);
         p.glLoadIdentity();
         p.gluPerspective(angle, ratio, near, far);
@@ -287,7 +288,7 @@ public abstract class Renderer {
     public boolean reshapeOrtho(GL2ES2 gl, int width, int height, float near, float far) {
         this.vp_width = width;
         this.vp_height = height;
-        final PMVMatrix p = rs.getPMVMatrix();
+        final PMVMatrix p = rs.pmvMatrix();
         p.glMatrixMode(GLMatrixFunc.GL_PROJECTION);
         p.glLoadIdentity();
         p.glOrthof(0, width, 0, height, near, far);
diff --git a/src/jogl/classes/com/jogamp/graph/curve/opengl/TextRenderer.java b/src/jogl/classes/com/jogamp/graph/curve/opengl/TextRenderer.java
index a955d5a88..deaa1dfad 100644
--- a/src/jogl/classes/com/jogamp/graph/curve/opengl/TextRenderer.java
+++ b/src/jogl/classes/com/jogamp/graph/curve/opengl/TextRenderer.java
@@ -96,7 +96,7 @@ public abstract class TextRenderer extends Renderer {
        Iterator<GlyphString> iterator = stringCacheMap.values().iterator();
        while(iterator.hasNext()){
            GlyphString glyphString = iterator.next();
-           glyphString.destroy(gl);
+           glyphString.destroy(gl, rs);
        }
        stringCacheMap.clear();    
        stringCacheArray.clear();
@@ -167,7 +167,7 @@ public abstract class TextRenderer extends Renderer {
        final String key = getKey(font, str, fontSize);
        GlyphString glyphString = stringCacheMap.remove(key);
        if(null != glyphString) {
-           glyphString.destroy(gl);
+           glyphString.destroy(gl, rs);
        }       
        stringCacheArray.remove(key);
    }
@@ -176,7 +176,7 @@ public abstract class TextRenderer extends Renderer {
        final String key = stringCacheArray.remove(idx);
        final GlyphString glyphString = stringCacheMap.remove(key);
        if(null != glyphString) {
-           glyphString.destroy(gl);
+           glyphString.destroy(gl, rs);
        }
    }
       
diff --git a/src/jogl/classes/com/jogamp/opengl/util/ImmModeSink.java b/src/jogl/classes/com/jogamp/opengl/util/ImmModeSink.java
index cb9e4cce5..9e92a9a1d 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/ImmModeSink.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/ImmModeSink.java
@@ -37,7 +37,7 @@ public class ImmModeSink {
    * a ShaderState must be current, using ShaderState.glUseProgram().
    *
    * @see #draw(GL, boolean)
-   * @see com.jogamp.opengl.util.glsl.ShaderState#glUseProgram(GL2ES2, boolean)
+   * @see com.jogamp.opengl.util.glsl.ShaderState#useProgram(GL2ES2, boolean)
    * @see com.jogamp.opengl.util.glsl.ShaderState#getCurrentShaderState()
    */
   public static ImmModeSink createGLSL(GL gl, int glBufferUsage, int initialSize,
@@ -762,35 +762,35 @@ public class ImmModeSink {
         }
 
         if(vComps>0) {
-           st.glEnableVertexAttribArray(glsl, vArrayData);
-           st.glVertexAttribPointer(glsl, vArrayData);
+           st.enableVertexAttribArray(glsl, vArrayData);
+           st.vertexAttribPointer(glsl, vArrayData);
         }
         if(cComps>0) {
-           st.glEnableVertexAttribArray(glsl, cArrayData);
-           st.glVertexAttribPointer(glsl, cArrayData);
+           st.enableVertexAttribArray(glsl, cArrayData);
+           st.vertexAttribPointer(glsl, cArrayData);
         }
         if(nComps>0) {
-           st.glEnableVertexAttribArray(glsl, nArrayData);
-           st.glVertexAttribPointer(glsl, nArrayData);
+           st.enableVertexAttribArray(glsl, nArrayData);
+           st.vertexAttribPointer(glsl, nArrayData);
         }
         if(tComps>0) {
-           st.glEnableVertexAttribArray(glsl, tArrayData);
-           st.glVertexAttribPointer(glsl, tArrayData);
+           st.enableVertexAttribArray(glsl, tArrayData);
+           st.vertexAttribPointer(glsl, tArrayData);
         }
 
         glsl.glBindBuffer(GL.GL_ARRAY_BUFFER, 0);
     } else {
         if(vComps>0) {
-           st.glDisableVertexAttribArray(glsl, vArrayData);
+           st.disableVertexAttribArray(glsl, vArrayData);
         }
         if(cComps>0) {
-           st.glDisableVertexAttribArray(glsl, cArrayData);
+           st.disableVertexAttribArray(glsl, cArrayData);
         }
         if(nComps>0) {
-           st.glDisableVertexAttribArray(glsl, nArrayData);
+           st.disableVertexAttribArray(glsl, nArrayData);
         }
         if(tComps>0) {
-           st.glDisableVertexAttribArray(glsl, tArrayData);
+           st.disableVertexAttribArray(glsl, tArrayData);
         }
     }
   }
diff --git a/src/jogl/classes/com/jogamp/opengl/util/glsl/GLSLArrayHandler.java b/src/jogl/classes/com/jogamp/opengl/util/glsl/GLSLArrayHandler.java
index f771ea019..73a1c2721 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/glsl/GLSLArrayHandler.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/glsl/GLSLArrayHandler.java
@@ -53,7 +53,7 @@ public class GLSLArrayHandler implements GLArrayHandler {
     GL2ES2 glsl = gl.getGL2ES2();
 
     if(enable) {
-        st.glEnableVertexAttribArray(glsl, ad);
+        st.enableVertexAttribArray(glsl, ad);
 
         Buffer buffer = ad.getBuffer();
 
@@ -68,7 +68,7 @@ public class GLSLArrayHandler implements GLArrayHandler {
                     glsl.glBufferData(ad.getVBOTarget(), ad.getByteSize(), buffer, ad.getVBOUsage());
                 }
                 ad.setVBOWritten(true);
-                st.glVertexAttribPointer(glsl, ad);
+                st.vertexAttribPointer(glsl, ad);
             } else {
                 // didn't experience a performance hit on this query ..
                 int[] qi = new int[1];
@@ -78,18 +78,18 @@ public class GLSLArrayHandler implements GLArrayHandler {
                         System.err.println("XXX VA "+ad.getName()+" VBO rebind: "+qi[0]+" -> "+ad.getVBOName());
                     }
                     glsl.glBindBuffer(ad.getVBOTarget(), ad.getVBOName());
-                    st.glVertexAttribPointer(glsl, ad);
+                    st.vertexAttribPointer(glsl, ad);
                 }
             }
         } else if(null!=buffer) {
-            st.glVertexAttribPointer(glsl, ad);
+            st.vertexAttribPointer(glsl, ad);
             ad.setVBOWritten(true);
         }
     } else {
         if(ad.isVBO()) {
             glsl.glBindBuffer(ad.getVBOTarget(), 0);
         }
-        st.glDisableVertexAttribArray(glsl, ad);
+        st.disableVertexAttribArray(glsl, ad);
     }
   }
 
diff --git a/src/jogl/classes/com/jogamp/opengl/util/glsl/ShaderState.java b/src/jogl/classes/com/jogamp/opengl/util/glsl/ShaderState.java
index de77a1941..f8fe987d7 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/glsl/ShaderState.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/glsl/ShaderState.java
@@ -29,6 +29,7 @@
 package com.jogamp.opengl.util.glsl;
 
 import java.security.AccessController;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
@@ -58,7 +59,7 @@ public class ShaderState {
     /**
      * Fetches the current shader state from this thread (TLS) current GLContext
      *
-     * @see com.jogamp.opengl.util.glsl.ShaderState#glUseProgram(GL2ES2, boolean)
+     * @see com.jogamp.opengl.util.glsl.ShaderState#useProgram(GL2ES2, boolean)
      * @see com.jogamp.opengl.util.glsl.ShaderState#getShaderState(GL)
      * @see com.jogamp.opengl.util.glsl.ShaderState#getCurrentShaderState()
      */
@@ -71,7 +72,7 @@ public class ShaderState {
      *
      * @param gl the GL object referencing the GLContext
      * 
-     * @see com.jogamp.opengl.util.glsl.ShaderState#glUseProgram(GL2ES2, boolean)
+     * @see com.jogamp.opengl.util.glsl.ShaderState#useProgram(GL2ES2, boolean)
      * @see com.jogamp.opengl.util.glsl.ShaderState#getShaderState(GL)
      * @see com.jogamp.opengl.util.glsl.ShaderState#getCurrentShaderState()
      */
@@ -130,32 +131,36 @@ public class ShaderState {
      * if <code>on</code> is <code>true</code>.
      *
      * @throws GLException if no program is attached
-     * @throws GLException if no program is not linked
      *
-     * @see com.jogamp.opengl.util.glsl.ShaderState#glUseProgram(GL2ES2, boolean)
+     * @see com.jogamp.opengl.util.glsl.ShaderState#useProgram(GL2ES2, boolean)
      * @see com.jogamp.opengl.util.glsl.ShaderState#getShaderState(GL)
      * @see com.jogamp.opengl.util.glsl.ShaderState#getCurrentShaderState()
      */
-    public synchronized void glUseProgram(GL2ES2 gl, boolean on) {
-        if(null==shaderProgram) { throw new GLException("No program is attached"); }
+    public synchronized void useProgram(GL2ES2 gl, boolean on) throws GLException {
+        if(null==shaderProgram) { throw new GLException("No program is attached"); }        
         if(on) {
-            shaderProgram.useProgram(gl, true);
             // update the current ShaderState to the TLS ..
             gl.getContext().attachObject(ShaderState.class.getName(), this);
-            if(resetAllShaderData) {
-                resetAllShaderData = false;
-                glResetAllVertexAttributes(gl);
-                glResetAllUniforms(gl);
+            if(shaderProgram.linked()) {
+                shaderProgram.useProgram(gl, true);
+                if(resetAllShaderData) {
+                    resetAllAttributes(gl);
+                    resetAllUniforms(gl);
+                }
+            } else if(resetAllShaderData) {
+                setAllAttributes(gl);
+                if(!shaderProgram.link(gl, System.err)) {
+                    throw new GLException("could not link program: "+shaderProgram);
+                }
+                shaderProgram.useProgram(gl, true);
+                resetAllUniforms(gl);
             }
+            resetAllShaderData = false;            
         } else {
             shaderProgram.useProgram(gl, false);
         }
     }
 
-    public synchronized void glUseProgram(GL2ES2 gl, ShaderProgram prog, boolean on) {
-        
-    }
-    
     public boolean linked() {
         return (null!=shaderProgram)?shaderProgram.linked():false;
     }
@@ -167,11 +172,16 @@ public class ShaderState {
     /**
      * Attach or switch a shader program
      *
-     * Attaching a shader program the first time, 
+     * <p>Attaching a shader program the first time, 
      * as well as switching to another program on the fly,
-     * while managing all attribute and uniform data.
+     * while managing all attribute and uniform data.</p>
+     * 
+     * <p>[Re]sets all data and use program in case of a program switch.<br> 
+     * Use program if linked in case of a 1st time attachment.</p>
+     * 
+     * @throws GLException if program was not linked and linking fails
      */
-    public synchronized void attachShaderProgram(GL2ES2 gl, ShaderProgram prog) {
+    public synchronized void attachShaderProgram(GL2ES2 gl, ShaderProgram prog) throws GLException {
         boolean prgInUse = false; // earmarked state
 
         if(DEBUG) {
@@ -192,7 +202,7 @@ public class ShaderState {
                 return;
             }
             prgInUse = shaderProgram.inUse();
-            glUseProgram(gl, false);
+            useProgram(gl, false);
             resetAllShaderData = true;
         }
 
@@ -200,9 +210,10 @@ public class ShaderState {
         shaderProgram = prog;
 
         if(null!=shaderProgram) {
-            // reinstall all data ..
-            if(shaderProgram.linked()) {
-                glUseProgram(gl, true);
+            // [re]set all data and use program if switching program, 
+            // or  use program if program is linked
+            if(shaderProgram.linked() || resetAllShaderData) {
+                useProgram(gl, true);
                 if(!prgInUse) {
                     shaderProgram.useProgram(gl, false);
                 }
@@ -216,27 +227,27 @@ public class ShaderState {
     public ShaderProgram shaderProgram() { return shaderProgram; }
 
     /**
-     * Calls release(gl, true, true)
+     * Calls {@link #release(GL2ES2, boolean, boolean, boolean) release(gl, true, true, true)}
      *
      * @see #glReleaseAllVertexAttributes
      * @see #glReleaseAllUniforms
-     * @see #release(GL2ES2, boolean, boolean)
+     * @see #release(GL2ES2, boolean, boolean, boolean)
      */
     public synchronized void destroy(GL2ES2 gl) {
-        release(gl, true, true);
+        release(gl, true, true, true);
         attachedObjectsByString.clear();        
         attachedObjectsByInt.clear();
     }
 
     /**
-     * Calls release(gl, false, false)
+     * Calls {@link #release(GL2ES2, boolean, boolean, boolean) release(gl, false, false, false)}
      *
      * @see #glReleaseAllVertexAttributes
      * @see #glReleaseAllUniforms
-     * @see #release(GL2ES2, boolean, boolean)
+     * @see #release(GL2ES2, boolean, boolean, boolean)
      */
     public synchronized void releaseAllData(GL2ES2 gl) {
-        release(gl, false, false);
+        release(gl, false, false, false);
     }
 
     /**
@@ -244,22 +255,21 @@ public class ShaderState {
      * @see #glReleaseAllUniforms
      * @see ShaderProgram#release(GL2ES2, boolean)
      */
-    public synchronized void release(GL2ES2 gl, boolean releaseProgramToo, boolean releaseShaderToo) {
-        boolean prgInUse = false;
-        if(null!=shaderProgram) {
-            prgInUse = shaderProgram.inUse();
-            if(!prgInUse) {
-                shaderProgram.useProgram(gl, true);
-            }
+    public synchronized void release(GL2ES2 gl, boolean destroyBoundAttributes, boolean releaseProgramToo, boolean releaseShaderToo) {
+        if(null!=shaderProgram) {            
+            shaderProgram.useProgram(gl, false);
+        }
+        if(destroyBoundAttributes) {
+            for(Iterator<GLArrayData> iter = managedAttributes.iterator(); iter.hasNext(); ) {
+                iter.next().destroy(gl);
+            }            
         }
-        glReleaseAllVertexAttributes(gl);
-        glReleaseAllUniforms(gl);
+        releaseAllAttributes(gl);
+        releaseAllUniforms(gl);
         if(null!=shaderProgram) {
             if(releaseProgramToo) {
                 shaderProgram.release(gl, releaseShaderToo);
-            } else if(!prgInUse) {
-                shaderProgram.useProgram(gl, false);
-            }
+            } 
         }
     }
 
@@ -273,13 +283,13 @@ public class ShaderState {
      * @return -1 if there is no such attribute available, 
      *         otherwise >= 0
      *
-     * @see #glBindAttribLocation(GL2ES2, int, String)
-     * @see #glBindAttribLocation(GL2ES2, int, GLArrayData)
-     * @see #glGetAttribLocation(GL2ES2, String)
+     * @see #bindAttribLocation(GL2ES2, int, String)
+     * @see #bindAttribLocation(GL2ES2, int, GLArrayData)
+     * @see #getAttribLocation(GL2ES2, String)
      * @see GL2ES2#glGetAttribLocation(int, String)
      */
     public int getAttribLocation(String name) {
-        Integer idx = (Integer) attribMap2Location.get(name);
+        Integer idx = (Integer) activeAttribLocationMap.get(name);
         return (null!=idx)?idx.intValue():-1;
     }
     
@@ -288,7 +298,7 @@ public class ShaderState {
      *
      * @return the GLArrayData object, null if not previously set.
      *
-     * @see #bindAttribute(GLArrayData)
+     * @see #ownAttribute(GLArrayData, boolean)
      *
      * @see #glEnableVertexAttribArray
      * @see #glDisableVertexAttribArray
@@ -299,26 +309,40 @@ public class ShaderState {
      * @see ShaderProgram#glReplaceShader
      */
     public GLArrayData getAttribute(String name) {
-        return (GLArrayData) vertexAttribMap2Data.get(name);
+        return (GLArrayData) activeAttribDataMap.get(name);
     }
     
     /**
-     * Bind the {@link GLArrayData} to this ShaderState. 
-     * If an attribute location is cached (ie {@link #glBindAttribLocation(GL2ES2, int, String)})
-     * it is promoted to the {@link GLArrayData} instance.
-     * To bind a {@link GLArrayData} with a given location
-     * {@link #glBindAttribLocation(GL2ES2, int, GLArrayData)} shall be used.
+     * Binds or unbinds the {@link GLArrayData} lifecycle to this ShaderState.
+     *  
+     * <p>If an attribute location is cached (ie {@link #bindAttribLocation(GL2ES2, int, String)})
+     * it is promoted to the {@link GLArrayData} instance.</p>
      * 
-     * @param data the {@link GLArrayData} to be processed
-     * @see #glBindAttribLocation(GL2ES2, int, String)
+     * <p>The attribute will be destroyed with {@link #destroy(GL2ES2)} 
+     * and it's location will be reset when switching shader with {@link #attachShaderProgram(GL2ES2, ShaderProgram)}.</p>
+     *  
+     * <p>The data will not be transfered to the GPU, use {@link #vertexAttribPointer(GL2ES2, GLArrayData)} additionally.</p>
+     * 
+     * @param attribute the {@link GLArrayData} which lifecycle shall be managed
+     * @param own true if <i>owning</i> shall be performs, false if <i>disowning</i>.
+     * 
+     * @see #bindAttribLocation(GL2ES2, int, String)
      * @see #getAttribute(String)
      */
-    public void bindAttribute(GLArrayData data) {
-        final int location = getAttribLocation(data.getName());
-        if(0<=location) {
-            data.setLocation(location);
+    public void ownAttribute(GLArrayData attribute, boolean own) {
+        if(own) {
+            final int location = getAttribLocation(attribute.getName());
+            if(0<=location) {
+                attribute.setLocation(location);
+            }
+            managedAttributes.add(managedAttributes.size(), attribute);
+        } else {
+            managedAttributes.remove(attribute);
         }
-        vertexAttribMap2Data.put(data.getName(), data);
+    }
+    
+    public boolean ownsAttribute(GLArrayData attribute) {
+        return managedAttributes.contains(attribute);
     }
     
     /**
@@ -331,14 +355,14 @@ public class ShaderState {
      * @throws GLException if the program is already linked
      * 
      * @see javax.media.opengl.GL2ES2#glBindAttribLocation(int, int, String)
-     * @see #glGetAttribLocation(GL2ES2, String)
+     * @see #getAttribLocation(GL2ES2, String)
      * @see #getAttribLocation(String)
      */
-    public void glBindAttribLocation(GL2ES2 gl, int location, String name) {
+    public void bindAttribLocation(GL2ES2 gl, int location, String name) {
         if(null==shaderProgram) throw new GLException("No program is attached");
         if(shaderProgram.linked()) throw new GLException("Program is already linked");        
         final Integer loc = new Integer(location);
-        attribMap2Location.put(name, loc);
+        activeAttribLocationMap.put(name, loc);
         gl.glBindAttribLocation(shaderProgram.program(), location, name);
     }
 
@@ -353,14 +377,14 @@ public class ShaderState {
      * @throws GLException if the program is already linked
      * 
      * @see javax.media.opengl.GL2ES2#glBindAttribLocation(int, int, String)
-     * @see #glGetAttribLocation(GL2ES2, String)
+     * @see #getAttribLocation(GL2ES2, String)
      * @see #getAttribLocation(String)
      * @see #getAttribute(String)
      */
-    public void glBindAttribLocation(GL2ES2 gl, int location, GLArrayData data) {
-        glBindAttribLocation(gl, location, data.getName());
+    public void bindAttribLocation(GL2ES2 gl, int location, GLArrayData data) {
+        bindAttribLocation(gl, location, data.getName());
         data.setLocation(location);
-        vertexAttribMap2Data.put(data.getName(), data);
+        activeAttribDataMap.put(data.getName(), data);
     }
 
     /**
@@ -375,11 +399,11 @@ public class ShaderState {
      * @throws GLException if the program is not linked and no location was cached.
      *
      * @see #getAttribLocation(String)
-     * @see #glBindAttribLocation(GL2ES2, int, GLArrayData)
-     * @see #glBindAttribLocation(GL2ES2, int, String)
+     * @see #bindAttribLocation(GL2ES2, int, GLArrayData)
+     * @see #bindAttribLocation(GL2ES2, int, String)
      * @see GL2ES2#glGetAttribLocation(int, String)
      */
-    public int glGetAttribLocation(GL2ES2 gl, String name) {
+    public int getAttribLocation(GL2ES2 gl, String name) {
         if(null==shaderProgram) throw new GLException("No program is attached");
         int location = getAttribLocation(name);
         if(0>location) {
@@ -387,7 +411,7 @@ public class ShaderState {
             location = gl.glGetAttribLocation(shaderProgram.program(), name);
             if(0<=location) {
                 Integer idx = new Integer(location);
-                attribMap2Location.put(name, idx);
+                activeAttribLocationMap.put(name, idx);
                 if(DEBUG) {
                     System.err.println("Info: glGetAttribLocation: "+name+", loc: "+location);
                 }
@@ -413,15 +437,15 @@ public class ShaderState {
      * @throws GLException if the program is not linked and no location was cached.
      *
      * @see #getAttribLocation(String)
-     * @see #glBindAttribLocation(GL2ES2, int, GLArrayData)
-     * @see #glBindAttribLocation(GL2ES2, int, String)
+     * @see #bindAttribLocation(GL2ES2, int, GLArrayData)
+     * @see #bindAttribLocation(GL2ES2, int, String)
      * @see GL2ES2#glGetAttribLocation(int, String)
      * @see #getAttribute(String)
      */
-    public int glGetAttribLocation(GL2ES2 gl, GLArrayData data) {
-        int location = glGetAttribLocation(gl, data.getName());
+    public int getAttribLocation(GL2ES2 gl, GLArrayData data) {
+        int location = getAttribLocation(gl, data.getName());
         data.setLocation(location);
-        vertexAttribMap2Data.put(data.getName(), data);
+        activeAttribDataMap.put(data.getName(), data);
         return location;
     }
     
@@ -433,7 +457,7 @@ public class ShaderState {
      * @return true if the named attribute is enable
      */
     public final boolean isVertexAttribArrayEnabled(String name) {
-        return enabledVertexAttribArraySet.contains(name);
+        return enabledAttributes.contains(name);
     }
     
     /**
@@ -443,10 +467,10 @@ public class ShaderState {
         return isVertexAttribArrayEnabled(data.getName());
     }
     
-    private boolean glEnableVertexAttribArray(GL2ES2 gl, String name, int location) {
-        enabledVertexAttribArraySet.add(name);
+    private boolean enableVertexAttribArray(GL2ES2 gl, String name, int location) {
+        enabledAttributes.add(name);
         if(0>location) {
-            location = glGetAttribLocation(gl, name);
+            location = getAttribLocation(gl, name);
             if(0>location) {
                 if(verbose) {
                     Throwable tX = new Throwable("Info: glEnableVertexAttribArray failed, no index for: "+name);
@@ -465,15 +489,14 @@ public class ShaderState {
     /**
      * Enables a vertex attribute array.
      * 
-     * This method retrieves the the location via {@link #glGetAttribLocation(GL2ES2, GLArrayData)}
-     * hence {@link #glEnableVertexAttribArray(GL2ES2, GLArrayData)} shall be preferred. 
+     * This method retrieves the the location via {@link #getAttribLocation(GL2ES2, GLArrayData)}
+     * hence {@link #enableVertexAttribArray(GL2ES2, GLArrayData)} shall be preferred. 
      *
      * Even if the attribute is not found in the current shader,
      * it is marked enabled in this state.
      *
      * @return false, if the name is not found, otherwise true
      *
-     * @throws GLException if no program is attached
      * @throws GLException if the program is not linked and no location was cached.
      * 
      * @see #glEnableVertexAttribArray
@@ -481,8 +504,8 @@ public class ShaderState {
      * @see #glVertexAttribPointer
      * @see #getVertexAttribPointer
      */
-    public boolean glEnableVertexAttribArray(GL2ES2 gl, String name) {
-        return glEnableVertexAttribArray(gl, name, -1);
+    public boolean enableVertexAttribArray(GL2ES2 gl, String name) {
+        return enableVertexAttribArray(gl, name, -1);
     }
     
 
@@ -490,8 +513,8 @@ public class ShaderState {
      * Enables a vertex attribute array, usually invoked by {@link GLArrayDataEditable#enableBuffer(GL, boolean)}.
      *
      * This method uses the {@link GLArrayData}'s location if set
-     * and is the preferred alternative to {@link #glEnableVertexAttribArray(GL2ES2, String)}.
-     * If data location is unset it will be retrieved via {@link #glGetAttribLocation(GL2ES2, GLArrayData)} set
+     * and is the preferred alternative to {@link #enableVertexAttribArray(GL2ES2, String)}.
+     * If data location is unset it will be retrieved via {@link #getAttribLocation(GL2ES2, GLArrayData)} set
      * and cached in this state.
      *  
      * Even if the attribute is not found in the current shader,
@@ -499,7 +522,6 @@ public class ShaderState {
      *
      * @return false, if the name is not found, otherwise true
      *
-     * @throws GLException if no program is attached
      * @throws GLException if the program is not linked and no location was cached.
      *
      * @see #glEnableVertexAttribArray
@@ -508,21 +530,20 @@ public class ShaderState {
      * @see #getVertexAttribPointer
      * @see GLArrayDataEditable#enableBuffer(GL, boolean)
      */
-    public boolean glEnableVertexAttribArray(GL2ES2 gl, GLArrayData data) {
-        if(null==shaderProgram) throw new GLException("No program is attached");
+    public boolean enableVertexAttribArray(GL2ES2 gl, GLArrayData data) {
         if(0 > data.getLocation()) {
-            glGetAttribLocation(gl, data);
+            getAttribLocation(gl, data);
         } else {
             // ensure data is the current bound one
-            vertexAttribMap2Data.put(data.getName(), data);             
+            activeAttribDataMap.put(data.getName(), data);             
         }
-        return glEnableVertexAttribArray(gl, data.getName(), data.getLocation());
+        return enableVertexAttribArray(gl, data.getName(), data.getLocation());
     }
     
-    private boolean glDisableVertexAttribArray(GL2ES2 gl, String name, int location) {
-        enabledVertexAttribArraySet.remove(name);
+    private boolean disableVertexAttribArray(GL2ES2 gl, String name, int location) {
+        enabledAttributes.remove(name);
         if(0>location) {
-            location = glGetAttribLocation(gl, name);
+            location = getAttribLocation(gl, name);
             if(0>location) {
                 if(verbose) {
                     Throwable tX = new Throwable("Info: glDisableVertexAttribArray failed, no index for: "+name);
@@ -541,8 +562,8 @@ public class ShaderState {
     /**
      * Disables a vertex attribute array
      *
-     * This method retrieves the the location via {@link #glGetAttribLocation(GL2ES2, GLArrayData)}
-     * hence {@link #glDisableVertexAttribArray(GL2ES2, GLArrayData)} shall be preferred.
+     * This method retrieves the the location via {@link #getAttribLocation(GL2ES2, GLArrayData)}
+     * hence {@link #disableVertexAttribArray(GL2ES2, GLArrayData)} shall be preferred.
      *  
      * Even if the attribute is not found in the current shader,
      * it is removed from this state enabled list.
@@ -557,16 +578,16 @@ public class ShaderState {
      * @see #glVertexAttribPointer
      * @see #getVertexAttribPointer
      */
-    public boolean glDisableVertexAttribArray(GL2ES2 gl, String name) {
-        return glDisableVertexAttribArray(gl, name, -1);
+    public boolean disableVertexAttribArray(GL2ES2 gl, String name) {
+        return disableVertexAttribArray(gl, name, -1);
     }
 
     /**
      * Disables a vertex attribute array
      *
      * This method uses the {@link GLArrayData}'s location if set
-     * and is the preferred alternative to {@link #glDisableVertexAttribArray(GL2ES2, String)}.
-     * If data location is unset it will be retrieved via {@link #glGetAttribLocation(GL2ES2, GLArrayData)} set
+     * and is the preferred alternative to {@link #disableVertexAttribArray(GL2ES2, String)}.
+     * If data location is unset it will be retrieved via {@link #getAttribLocation(GL2ES2, GLArrayData)} set
      * and cached in this state.
      *  
      * Even if the attribute is not found in the current shader,
@@ -582,41 +603,40 @@ public class ShaderState {
      * @see #glVertexAttribPointer
      * @see #getVertexAttribPointer
      */
-    public boolean glDisableVertexAttribArray(GL2ES2 gl, GLArrayData data) {
-        if(null==shaderProgram) throw new GLException("No program is attached");
+    public boolean disableVertexAttribArray(GL2ES2 gl, GLArrayData data) {
         if(0 > data.getLocation()) {
-            glGetAttribLocation(gl, data);
+            getAttribLocation(gl, data);
         }
-        return glDisableVertexAttribArray(gl, data.getName(), data.getLocation());
+        return disableVertexAttribArray(gl, data.getName(), data.getLocation());
     }
     
     /**
      * Set the {@link GLArrayData} vertex attribute data.
      * 
      * This method uses the {@link GLArrayData}'s location if set.
-     * If data location is unset it will be retrieved via {@link #glGetAttribLocation(GL2ES2, GLArrayData)}, set
+     * If data location is unset it will be retrieved via {@link #getAttribLocation(GL2ES2, GLArrayData)}, set
      * and cached in this state.
      * 
      * @return false, if the location could not be determined, otherwise true
      *
-     * @throws GLException if the program is not in use
-     *
+     * @throws GLException if no program is attached
+     * @throws GLException if the program is not linked and no location was cached.
+     * 
      * @see #glEnableVertexAttribArray
      * @see #glDisableVertexAttribArray
      * @see #glVertexAttribPointer
      * @see #getVertexAttribPointer
      */
-    public boolean glVertexAttribPointer(GL2ES2 gl, GLArrayData data) {
-        if(null==shaderProgram) throw new GLException("No program is attached");
-        // if(!shaderProgram.inUse()) throw new GLException("Program is not in use");
-        if(0 > data.getLocation()) {
-            glGetAttribLocation(gl, data);
-        } /* else {
-            // Already achieved by glEnableVertexAttribArray(..)
+    public boolean vertexAttribPointer(GL2ES2 gl, GLArrayData data) {
+        int location = data.getLocation();
+        if(0 > location) {
+            location = getAttribLocation(gl, data);
+        } /* else { 
+            done via enable ..
             // ensure data is the current bound one
-            vertexAttribMap2Data.put(data.getName(), data); 
+            activeAttribDataMap.put(data.getName(), data);             
         } */
-        if(0 <= data.getLocation()) {
+        if(0 <= location) {
             // only pass the data, if the attribute exists in the current shader
             if(DEBUG) {
                 System.err.println("Info: glVertexAttribPointer: "+data);
@@ -631,8 +651,6 @@ public class ShaderState {
      * Releases all mapped vertex attribute data,
      * disables all enabled attributes and loses all indices
      *
-     * @throws GLException is the program is not in use but the shaderProgram is set
-     *
      * @see #glEnableVertexAttribArray
      * @see #glDisableVertexAttribArray
      * @see #glVertexAttribPointer
@@ -642,23 +660,23 @@ public class ShaderState {
      * @see #glResetAllVertexAttributes
      * @see ShaderProgram#glReplaceShader
      */
-    public void glReleaseAllVertexAttributes(GL2ES2 gl) {
+    public void releaseAllAttributes(GL2ES2 gl) {
         if(null!=shaderProgram) {
-            if(!shaderProgram.inUse()) throw new GLException("Program is not in use");
-            for(Iterator<GLArrayData> iter = vertexAttribMap2Data.values().iterator(); iter.hasNext(); ) {
-                if(!glDisableVertexAttribArray(gl, iter.next())) {
+            for(Iterator<GLArrayData> iter = activeAttribDataMap.values().iterator(); iter.hasNext(); ) {
+                if(!disableVertexAttribArray(gl, iter.next())) {
                     throw new GLException("Internal Error: mapped vertex attribute couldn't be disabled");
                 }
             }
-            for(Iterator iter = enabledVertexAttribArraySet.iterator(); iter.hasNext(); ) {
-                if(!glDisableVertexAttribArray(gl, (String) iter.next())) {
+            for(Iterator<String> iter = enabledAttributes.iterator(); iter.hasNext(); ) {
+                if(!disableVertexAttribArray(gl, iter.next())) {
                     throw new GLException("Internal Error: prev enabled vertex attribute couldn't be disabled");
                 }
             }
         }
-        vertexAttribMap2Data.clear();
-        enabledVertexAttribArraySet.clear();
-        attribMap2Location.clear();
+        activeAttribDataMap.clear();
+        enabledAttributes.clear();
+        activeAttribLocationMap.clear();
+        managedAttributes.clear();        
     }
         
     /**
@@ -669,8 +687,6 @@ public class ShaderState {
      *
      * This method purpose is more for debugging. 
      *
-     * @throws GLException is the program is not in use but the shaderProgram is set
-     *
      * @see #glEnableVertexAttribArray
      * @see #glDisableVertexAttribArray
      * @see #glVertexAttribPointer
@@ -680,62 +696,92 @@ public class ShaderState {
      * @see #glResetAllVertexAttributes
      * @see ShaderProgram#glReplaceShader
      */
-    public void glDisableAllVertexAttributeArrays(GL2ES2 gl, boolean removeFromState) {
-        if(!shaderProgram.inUse()) throw new GLException("Program is not in use");
-
-        for(Iterator iter = enabledVertexAttribArraySet.iterator(); iter.hasNext(); ) {
-            String name = (String) iter.next();
+    public void disableAllVertexAttributeArrays(GL2ES2 gl, boolean removeFromState) {
+        for(Iterator<String> iter = enabledAttributes.iterator(); iter.hasNext(); ) {
+            String name = iter.next();
             if(removeFromState) {
-                enabledVertexAttribArraySet.remove(name);
+                enabledAttributes.remove(name);
             }
-            int index = glGetAttribLocation(gl, name);
+            int index = getAttribLocation(gl, name);
             if(0<=index) {
                 gl.glDisableVertexAttribArray(index);
             }
         }
     }
 
+    private final void relocateAttribute(GL2ES2 gl, GLArrayData attribute) {
+        // get new location ..
+        String name = attribute.getName();
+        int loc = getAttribLocation(gl, name);
+        attribute.setLocation(loc);
+
+        if(0<=loc) {
+            if(enabledAttributes.contains(name)) {
+                // enable attrib, VBO and pass location/data
+                gl.glEnableVertexAttribArray(loc);
+            }
+    
+            if( attribute.isVBO() ) {
+                gl.glBindBuffer(GL.GL_ARRAY_BUFFER, attribute.getVBOName());
+            } 
+    
+            gl.glVertexAttribPointer(attribute);
+        }
+    }
+    
     /**
      * Reset all previously enabled mapped vertex attribute data.
      * 
-     * Attribute data is bound to the GL state<br>
-     * Attribute location is bound to the program<br>
+     * <p>Attribute data is bound to the GL state</p>
+     * <p>Attribute location is bound to the program</p>
      * 
-     * However, since binding an attribute to a location via {@link #glBindAttribLocation(GL2ES2, int, GLArrayData)}
+     * <p>However, since binding an attribute to a location via {@link #bindAttribLocation(GL2ES2, int, GLArrayData)}
      * <i>must</i> happen before linking <b>and</b> we try to promote the attributes to the new program,
-     * we have to gather the probably new location etc.
+     * we have to gather the probably new location etc.</p>
      *
-     * @throws GLException is the program is not in use
+     * @throws GLException is the program is not linked
      *
      * @see #attachShaderProgram(GL2ES2, ShaderProgram)
      */
-    public void glResetAllVertexAttributes(GL2ES2 gl) {
-        if(!shaderProgram.inUse()) throw new GLException("Program is not in use");
-        attribMap2Location.clear();
+    private final void resetAllAttributes(GL2ES2 gl) {
+        if(!shaderProgram.linked()) throw new GLException("Program is not linked");
+        activeAttribLocationMap.clear();
         
-        for(Iterator<GLArrayData> iter = vertexAttribMap2Data.values().iterator(); iter.hasNext(); ) {        
-            GLArrayData data = iter.next();
-            
-            // get new location ..
-            String name = data.getName();
-            int loc = glGetAttribLocation(gl, name);
-            data.setLocation(loc);
-
-            if(0>loc) {
-                // not used in shader
-                continue;
-            }
+        for(Iterator<GLArrayData> iter = managedAttributes.iterator(); iter.hasNext(); ) {
+            iter.next().setLocation(-1);
+        }
+        for(Iterator<GLArrayData> iter = activeAttribDataMap.values().iterator(); iter.hasNext(); ) {
+            relocateAttribute(gl, iter.next());
+        }
+    }
+
+    private final void setAttribute(GL2ES2 gl, GLArrayData attribute) {
+        // get new location ..
+        final String name = attribute.getName();
+        final int loc = attribute.getLocation();
+
+        if(0<=loc) {
+            this.bindAttribLocation(gl, loc, name);
             
-            if(enabledVertexAttribArraySet.contains(name)) {
+            if(enabledAttributes.contains(name)) {
                 // enable attrib, VBO and pass location/data
                 gl.glEnableVertexAttribArray(loc);
             }
-
-            if( data.isVBO() ) {
-                gl.glBindBuffer(GL.GL_ARRAY_BUFFER, data.getVBOName());
+    
+            if( attribute.isVBO() ) {
+                gl.glBindBuffer(GL.GL_ARRAY_BUFFER, attribute.getVBOName());
             } 
-
-            gl.glVertexAttribPointer(data);
+    
+            gl.glVertexAttribPointer(attribute);
+        }
+    }
+    
+    /**
+     * preserves the attribute location .. (program not linked)
+     */
+    private final void setAllAttributes(GL2ES2 gl) {
+        for(Iterator<GLArrayData> iter = activeAttribDataMap.values().iterator(); iter.hasNext(); ) {
+            setAttribute(gl, iter.next());
         }
     }
 
@@ -744,6 +790,33 @@ public class ShaderState {
     //
 
     /**
+     * Bind the {@link GLUniform} lifecycle to this ShaderState.
+     *  
+     * <p>If a uniform location is cached it is promoted to the {@link GLUniformData} instance.</p>
+     * 
+     * <p>The attribute will be destroyed with {@link #destroy(GL2ES2)} 
+     * and it's location will be reset when switching shader with {@link #attachShaderProgram(GL2ES2, ShaderProgram)}.</p>
+     *  
+     * <p>The data will not be transfered to the GPU, use {@link #uniform(GL2ES2, GLUniformData)} additionally.</p>
+     * 
+     * @param uniform the {@link GLUniformData} which lifecycle shall be managed
+     * 
+     * @see #getUniform(String)
+     */
+    public void ownUniform(GLUniformData uniform) {
+        final int location = getUniformLocation(uniform.getName());
+        if(0<=location) {
+            uniform.setLocation(location);
+        }        
+        activeUniformDataMap.put(uniform.getName(), uniform);
+        managedUniforms.add(uniform);        
+    }
+    
+    public boolean ownsUniform(GLUniformData uniform) {
+        return managedUniforms.contains(uniform);
+    }
+    
+    /**
      * Gets the index of a shader uniform.
      * This must be done when the program is in use !
      *
@@ -757,14 +830,14 @@ public class ShaderState {
      * @see #getUniformLocation
      * @see ShaderProgram#glReplaceShader
      */
-    protected int glGetUniformLocation(GL2ES2 gl, String name) {
+    protected final int getUniformLocation(GL2ES2 gl, String name) {
         if(!shaderProgram.inUse()) throw new GLException("Program is not in use");
         int location = getUniformLocation(name);
         if(0>location) {
             location = gl.glGetUniformLocation(shaderProgram.program(), name);
             if(0<=location) {
                 Integer idx = new Integer(location);
-                uniformMap2Location.put(name, idx);
+                activeUniformLocationMap.put(name, idx);
             } else if(verbose) {
                 Throwable tX = new Throwable("Info: glUniform failed, no location for: "+name+", index: "+location);
                 tX.printStackTrace();
@@ -773,8 +846,8 @@ public class ShaderState {
         return location;
     }
 
-    protected int getUniformLocation(String name) {
-        Integer idx = (Integer) uniformMap2Location.get(name);
+    protected final int getUniformLocation(String name) {
+        Integer idx = (Integer) activeUniformLocationMap.get(name);
         return (null!=idx)?idx.intValue():-1;
     }
 
@@ -798,11 +871,14 @@ public class ShaderState {
      * @see #getUniformLocation
      * @see ShaderProgram#glReplaceShader
      */
-    public boolean glUniform(GL2ES2 gl, GLUniformData data) {
+    public boolean uniform(GL2ES2 gl, GLUniformData data) {
         if(!shaderProgram.inUse()) throw new GLException("Program is not in use");
-        int location = glGetUniformLocation(gl, data.getName());
-        data.setLocation(location);
-        uniformMap2Data.put(data.getName(), data);
+        int location = data.getLocation();
+        if(0>location) {
+            location = getUniformLocation(gl, data.getName());
+            data.setLocation(location);
+        }
+        activeUniformDataMap.put(data.getName(), data);
         if(0<=location) {
             // only pass the data, if the uniform exists in the current shader
             if(DEBUG) {
@@ -819,18 +895,17 @@ public class ShaderState {
      * @return the GLUniformData object, null if not previously set.
      */
     public GLUniformData getUniform(String name) {
-        return uniformMap2Data.get(name);
+        return activeUniformDataMap.get(name);
     }
 
     /**
      * Releases all mapped uniform data
      * and loses all indices
-     *
-     * @throws GLException is the program is not in use
      */
-    public void glReleaseAllUniforms(GL2ES2 gl) {
-        uniformMap2Data.clear();
-        uniformMap2Location.clear();
+    public void releaseAllUniforms(GL2ES2 gl) {
+        activeUniformDataMap.clear();
+        activeUniformLocationMap.clear();
+        managedUniforms.clear();
     }
         
     /**
@@ -843,11 +918,16 @@ public class ShaderState {
      * 
      * @see #attachShaderProgram(GL2ES2, ShaderProgram)
      */
-    public void glResetAllUniforms(GL2ES2 gl) {
-        if(!shaderProgram.inUse()) throw new GLException("Program is not in use");
-        uniformMap2Location.clear();
-        for(Iterator<GLUniformData> iter = uniformMap2Data.values().iterator(); iter.hasNext(); ) {
-            glUniform(gl, iter.next());
+    private final void resetAllUniforms(GL2ES2 gl) {
+        if(!shaderProgram.inUse()) throw new GLException("Program is not in use");        
+        activeUniformLocationMap.clear();
+        for(Iterator<GLUniformData> iter = managedUniforms.iterator(); iter.hasNext(); ) {
+            iter.next().setLocation(-1);
+        }        
+        for(Iterator<GLUniformData> iter = activeUniformDataMap.values().iterator(); iter.hasNext(); ) {
+            final GLUniformData uniform = iter.next();
+            uniform.setLocation(-1);
+            uniform(gl, uniform);
         }
     }
 
@@ -858,26 +938,30 @@ public class ShaderState {
         
         sb.append("ShaderState[");
         sb.append(shaderProgram.toString());
-        sb.append(",EnabledStates: [");
-        for(Iterator iter = enabledVertexAttribArraySet.iterator(); iter.hasNext(); ) {
+        sb.append(", enabledAttributes: [");
+        for(Iterator<String> iter = enabledAttributes.iterator(); iter.hasNext(); ) {
             sb.append("\n  ");
             sb.append((String)iter.next());
         }
-        sb.append("], [");
-        for(Iterator<GLArrayData> iter = vertexAttribMap2Data.values().iterator(); iter.hasNext(); ) {
-            GLArrayData data = iter.next();
-            if(data.getLocation()>=0) {
-                sb.append("\n  ");
-                sb.append(data);
-            }
+        sb.append("], activeAttributes [");
+        for(Iterator<GLArrayData> iter = activeAttribDataMap.values().iterator(); iter.hasNext(); ) {
+            sb.append("\n  ");
+            sb.append(iter.next());
         }
-        sb.append("], [");
-        for(Iterator<GLUniformData> iter=uniformMap2Data.values().iterator(); iter.hasNext(); ) {
-            GLUniformData data = iter.next();
-            if(data.getLocation()>=0) {
-                sb.append("\n  ");
-                sb.append(data);
-            }
+        sb.append("], managedAttributes [");
+        for(Iterator<GLArrayData> iter = managedAttributes.iterator(); iter.hasNext(); ) {
+            sb.append("\n  ");
+            sb.append(iter.next());
+        }
+        sb.append("], activeUniforms [");
+        for(Iterator<GLUniformData> iter=activeUniformDataMap.values().iterator(); iter.hasNext(); ) {
+            sb.append("\n  ");
+            sb.append(iter.next());
+        }
+        sb.append("], managedUniforms [");
+        for(Iterator<GLUniformData> iter = managedUniforms.iterator(); iter.hasNext(); ) {
+            sb.append("\n  ");
+            sb.append(iter.next());
         }
         sb.append("]");
         return sb;
@@ -888,15 +972,17 @@ public class ShaderState {
         return toString(null).toString();
     }
     
-    protected boolean verbose = false;
-    protected ShaderProgram shaderProgram=null;
+    private boolean verbose = false;
+    private ShaderProgram shaderProgram=null;
     
-    protected HashSet<String> enabledVertexAttribArraySet = new HashSet<String>();
-    protected HashMap<String, Integer> attribMap2Location = new HashMap<String, Integer>();
-    protected HashMap<String, GLArrayData> vertexAttribMap2Data = new HashMap<String, GLArrayData>();
+    private HashSet<String> enabledAttributes = new HashSet<String>();
+    private HashMap<String, Integer> activeAttribLocationMap = new HashMap<String, Integer>();
+    private HashMap<String, GLArrayData> activeAttribDataMap = new HashMap<String, GLArrayData>();
+    private ArrayList<GLArrayData> managedAttributes = new ArrayList<GLArrayData>();
     
-    protected HashMap<String, Integer> uniformMap2Location = new HashMap<String, Integer>();
-    protected HashMap<String, GLUniformData> uniformMap2Data = new HashMap<String, GLUniformData>();
+    private HashMap<String, Integer> activeUniformLocationMap = new HashMap<String, Integer>();
+    private HashMap<String, GLUniformData> activeUniformDataMap = new HashMap<String, GLUniformData>();
+    private ArrayList<GLUniformData> managedUniforms = new ArrayList<GLUniformData>();
     
     private HashMap<String, Object> attachedObjectsByString = new HashMap<String, Object>();    
     private IntObjectHashMap attachedObjectsByInt = new IntObjectHashMap();