From b45fff547049103287ba4a6b0f7b635013b81298 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Fri, 12 Jun 2009 13:01:31 +0000
Subject: GLSL ShaderUtil: Use TLS to make it thread safe

git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/branches/JOGL_2_SANDBOX@1934 232f8b59-042b-4e1e-8c03-345bb8c30851
---
 .../com/sun/opengl/util/glsl/ShaderState.java       | 21 +++++++++++++--------
 .../com/sun/opengl/util/glsl/ShaderUtil.java        |  6 ++----
 2 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/src/jogl/classes/com/sun/opengl/util/glsl/ShaderState.java b/src/jogl/classes/com/sun/opengl/util/glsl/ShaderState.java
index 5acbff241..bab9ef4f3 100644
--- a/src/jogl/classes/com/sun/opengl/util/glsl/ShaderState.java
+++ b/src/jogl/classes/com/sun/opengl/util/glsl/ShaderState.java
@@ -20,16 +20,23 @@ public class ShaderState {
     public void setVerbose(boolean v) { verbose=v; }
 
     /**
-     * Fetches the current shader state
+     * Fetches the current shader state from the thread local storage (TLS)
      *
      * @see javax.media.opengl.glsl.ShaderState#glUseProgram(GL2ES2, boolean)
      * @see javax.media.opengl.glsl.ShaderState#getCurrent()
      */
-    public static synchronized ShaderState getCurrent() { return currentShaderState; }
+    public static synchronized ShaderState getCurrent() { 
+        GLContext current = GLContext.getCurrent();
+        if(null==current) {
+            throw new GLException("No context is current on this thread");
+        }
+        return (ShaderState) current.getAttachedObject(ShaderState.class.getName());
+    }
 
     /**
-     * Turns the shader program on 
-     * and set this ShaderState to current if on equals true
+     * Turns the shader program on or off.<br>
+     * Puts this ShaderState to to the thread local storage (TLS),
+     * if <code>on</code> is <code>true</code>.
      *
      * @see javax.media.opengl.glsl.ShaderState#glUseProgram(GL2ES2, boolean)
      * @see javax.media.opengl.glsl.ShaderState#getCurrent()
@@ -41,9 +48,8 @@ public class ShaderState {
             } else {
                 throw new GLException("No program is attached");
             }
-            if(currentShaderState!=this) {
-                currentShaderState = this;
-            }
+            // update the current ShaderState to the TLS ..
+            gl.getContext().putAttachedObject(ShaderState.class.getName(), this);
         } else if(null!=shaderProgram) {
             shaderProgram.glUseProgram(gl, false);
         }
@@ -637,7 +643,6 @@ public class ShaderState {
     protected HashMap vertexAttribMap2Data = new HashMap();
     protected HashMap uniformMap2Idx = new HashMap();
     protected HashMap uniformMap2Data = new HashMap();
-    protected static ShaderState currentShaderState = null;
 
 }
 
diff --git a/src/jogl/classes/com/sun/opengl/util/glsl/ShaderUtil.java b/src/jogl/classes/com/sun/opengl/util/glsl/ShaderUtil.java
index 8bac24b86..d1bb8b32b 100644
--- a/src/jogl/classes/com/sun/opengl/util/glsl/ShaderUtil.java
+++ b/src/jogl/classes/com/sun/opengl/util/glsl/ShaderUtil.java
@@ -388,12 +388,10 @@ public class ShaderUtil {
     private static Impl getImpl(GL _gl) {
         GL2ES2 gl = _gl.getGL2ES2();
         GLContext context = gl.getContext();
-        // Argument could be anything suitably unique
-        String name = "com.sun.opengl.util.glsl.ShaderUtil.GL2ES2Impl";
-        Impl impl = (Impl) context.getAttachedObject(name);
+        Impl impl = (Impl) context.getAttachedObject(ShaderUtil.class.getName());
         if (impl == null) {
             impl = new GL2ES2Impl();
-            context.putAttachedObject(name, impl);
+            context.putAttachedObject(ShaderUtil.class.getName(), impl);
         }
         return impl;
     }
-- 
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