GLArrayData/ImmModeSink: Remove implicit dependency on ShaderState - allow operating w/o it; ShaderState: Remove notion of GL context attachment, use pass-through or object association; GLArrayData/GLUniformData: Add basic GLSL location methods

- GLArrayData/GLUniformData: Add basic GLSL location methods
  - GLArrayData
    - add: setLocation(..) for attribute location/index retrieval (post link) and binding (pre link)
  - GLUniformData
    - add: setLocation(..) for attribute location/index retrieval (post link)

- GLArrayData/ImmModeSink: Remove implicit dependency on ShaderState - allow operating w/o it
  - GLArrayData
    - add: 'public void associate(Object obj, boolean enable)', allows setting ShaderState usage

- ShaderState: Remove notion of GL context attachment, use pass-through or object association
  - ownsAttribute(..) associates the attribute w/ ShaderState
  - removed GL context ShaderState attachment

Tested:
 - ImmModeSink w/ GLSL/ES2 w/ and w/o ShaderState
 - GLArrayData* w/ and w/o ShaderState

1 files changed, 18 insertions, 2 deletions

diff --git a/src/jogl/classes/javax/media/opengl/GLUniformData.java b/src/jogl/classes/javax/media/opengl/GLUniformData.java
index 18a422670..60d0c58bf 100644
--- a/src/jogl/classes/javax/media/opengl/GLUniformData.java
+++ b/src/jogl/classes/javax/media/opengl/GLUniformData.java
@@ -147,10 +147,26 @@ public class GLUniformData {
     public int getLocation() { return location; }
 
     /**
-     * Sets the determined location of the shader uniform.
+     * Sets the given location of the shader uniform.
+     * @return the given location
      */
-    public GLUniformData setLocation(int location) { this.location=location; return this; }
+    public int setLocation(int location) { this.location=location; return location; }
 
+    /**
+     * Retrieves the location of the shader uniform from the linked shader program.
+     * <p>
+     * No validation is performed within the implementation.
+     * </p>
+     * @param gl
+     * @param program
+     * @return &ge;0 denotes a valid uniform location as found and used in the given shader program.
+     *         &lt;0 denotes an invalid location, i.e. not found or used in the given shader program.
+     */
+    public int setLocation(GL2ES2 gl, int program) {
+        location = gl.glGetUniformLocation(program, name);
+        return location;
+    }
+    
     public Object getObject() {
         return data;
     }