GLWindow/GLDrawableHelper: Adding experimental notion of skipping GL context release for a specific thread

- marked deprecated

- used to perf measure situation on omap3, ie
  figuring out where the low perf. in GearsES2 comes from,
  our core JOGL code or the GL usage.
  Turns out it's the GL usage itself, ie the shader - good.

- calls are commented out in the demos

1 files changed, 62 insertions, 16 deletions

diff --git a/src/jogl/classes/jogamp/opengl/GLDrawableHelper.java b/src/jogl/classes/jogamp/opengl/GLDrawableHelper.java
index 5d91a5ee2..722ab4e7f 100644
--- a/src/jogl/classes/jogamp/opengl/GLDrawableHelper.java
+++ b/src/jogl/classes/jogamp/opengl/GLDrawableHelper.java
@@ -43,16 +43,18 @@ package jogamp.opengl;
 import java.util.*;
 import javax.media.opengl.*;
 
+import com.jogamp.opengl.util.Animator;
+
 /** Encapsulates the implementation of most of the GLAutoDrawable's
     methods to be able to share it between GLCanvas and GLJPanel. */
 
 public class GLDrawableHelper {
   protected static final boolean DEBUG = GLDrawableImpl.DEBUG;
-  private static final boolean VERBOSE = Debug.verbose();
   private Object listenersLock = new Object();
   private ArrayList<GLEventListener> listeners;
   private HashSet<GLEventListener> listenersToBeInit;
   private boolean autoSwapBufferMode;
+  private Thread skipContextReleaseThread;
   private Object glRunnablesLock = new Object();
   private ArrayList<GLRunnable> glRunnables;
   private GLAnimatorControl animatorCtrl;
@@ -67,6 +69,7 @@ public class GLDrawableHelper {
         listenersToBeInit = new HashSet<GLEventListener>();
     }
     autoSwapBufferMode = true;
+    skipContextReleaseThread = null;
     synchronized(glRunnablesLock) {
         glRunnables = new ArrayList<GLRunnable>();
     }
@@ -270,14 +273,31 @@ public class GLDrawableHelper {
     }
   }
 
-  public final void setAutoSwapBufferMode(boolean onOrOff) {
-    autoSwapBufferMode = onOrOff;
+  public final void setAutoSwapBufferMode(boolean enable) {
+    autoSwapBufferMode = enable;
   }
 
   public final boolean getAutoSwapBufferMode() {
     return autoSwapBufferMode;
   }
 
+  /**
+   * @param t the thread for which context release shall be skipped, usually the animation thread,
+   *          ie. {@link Animator#getThread()}.
+   * @deprecated this is an experimental feature, 
+   *             intended for measuring performance in regards to GL context switch
+   */
+  public final void setSkipContextReleaseThread(Thread t) {
+    skipContextReleaseThread = t;
+  }
+
+  /**
+   * @deprecated see {@link #setSkipContextReleaseThread(Thread)} 
+   */
+  public final Thread getSkipContextReleaseThread() {
+    return skipContextReleaseThread;
+  }
+
   private static final ThreadLocal<Runnable> perThreadInitAction = new ThreadLocal<Runnable>();
 
   /** Principal helper method which runs a Runnable with the context
@@ -316,16 +336,31 @@ public class GLDrawableHelper {
 
     // Support for recursive makeCurrent() calls as well as calling
     // other drawables' display() methods from within another one's
-    // FIXME: re-evaluate due to possible expensive TLS access ? 
-    GLContext lastContext    = GLContext.getCurrent();
-    Runnable  lastInitAction = perThreadInitAction.get();
+    int res = GLContext.CONTEXT_NOT_CURRENT;
+    GLContext lastContext = GLContext.getCurrent();
+    Runnable  lastInitAction = null;
     if (lastContext != null) {
-      lastContext.release();
+        if (lastContext == context) {
+            res = GLContext.CONTEXT_CURRENT;
+            lastContext = null;
+        } else {
+            lastInitAction = perThreadInitAction.get();
+            lastContext.release();
+        }
     }
   
-    int res = 0;
+    /**
+    long t0 = System.currentTimeMillis();
+    long td1 = 0; // makeCurrent
+    long tdR = 0; // render time
+    long td2 = 0; // swapBuffers
+    long td3 = 0; // release
+    boolean scr = true; */
+    
     try {
-      res = context.makeCurrent();
+      if (res == GLContext.CONTEXT_NOT_CURRENT) {
+          res = context.makeCurrent();
+      }
       if (res != GLContext.CONTEXT_NOT_CURRENT) {
         if(null!=initAction) {
             perThreadInitAction.set(initAction);
@@ -336,32 +371,43 @@ public class GLDrawableHelper {
               initAction.run();
             }
         }
+        // tdR = System.currentTimeMillis();        
+        // td1 = tdR - t0; // makeCurrent
         if(null!=runnable) {
-            if (DEBUG && VERBOSE) {
+            if (DEBUG) {
               System.err.println("GLDrawableHelper " + this + ".invokeGL(): Running runnable");
             }
             runnable.run();
+            // td2 = System.currentTimeMillis();
+            // tdR = td2 - tdR; // render time
             if (autoSwapBufferMode && null != initAction) {
               if (drawable != null) {
                 drawable.swapBuffers();
+                // td3 = System.currentTimeMillis();
+                // td2 = td3 - td2; // swapBuffers
               }
             }
         }
       }
     } finally {
-      try {
-        if (res != GLContext.CONTEXT_NOT_CURRENT) {
-          context.release();
-        }
-      } catch (Exception e) {
+      if(res != GLContext.CONTEXT_NOT_CURRENT &&
+         (null == skipContextReleaseThread || Thread.currentThread()!=skipContextReleaseThread) ) {
+          try {
+              context.release();
+              // scr = false;
+          } catch (Exception e) {
+          }
       }
+      // td3 = System.currentTimeMillis() - td3; // release
       if (lastContext != null) {
         int res2 = lastContext.makeCurrent();
-        if (res2 == GLContext.CONTEXT_CURRENT_NEW) {
+        if (null != lastInitAction && res2 == GLContext.CONTEXT_CURRENT_NEW) {
           lastInitAction.run();
         }
       }
     }
+    // long td0 = System.currentTimeMillis() - t0;
+    // System.err.println("td0 "+td0+"ms, fps "+(1.0/(td0/1000.0))+", td-makeCurrent: "+td1+"ms, td-render "+tdR+"ms, td-swap "+td2+"ms, td-release "+td3+"ms, skip ctx release: "+scr);
   }
 
 }