Bug 888 - Validate CPU Runtime Performance: X11GLXGraphicsConfiguration.GLXFBConfig2GLCapabilities(..)

X11GLXGraphicsConfiguration.GLXFBConfig2GLCapabilities(..) ran over all FB configs and for each it grabbed
native config values separately. Fetching them in bulk mode saves around 7% of this function's cost.

Also reuse XRenderPictFormat instance for 'XRenderDirectFormat XRenderFindVisualFormat(..)' call,
saving a few NIO creation cycles w/ StructAccessor.

Biggest savior is X11GLXGraphicsConfigurationFactory.chooseGraphicsConfigurationFBConfig()'s
fast path w/o chooser and usable 1st FBConfig. Here we only issue 'GLXFBConfig2GLCapabilities(..)'
on the first valid entry.

Test w/ 50 X11GLXGraphicsConfigurationFactory.chooseGraphicsConfigurationFBConfig() invocations:
  - pre change:  1.708 ms
  - post change:   650 ms

Time is no spent almost solely on native glXChooseFBConfig (546ms).

1 files changed, 15 insertions, 0 deletions

diff --git a/make/config/nativewindow/x11-CustomJavaCode.java b/make/config/nativewindow/x11-CustomJavaCode.java
index 4240c5e2f..d1e011184 100644
--- a/make/config/nativewindow/x11-CustomJavaCode.java
+++ b/make/config/nativewindow/x11-CustomJavaCode.java
@@ -1,4 +1,19 @@
 
+  /** Interface to C language function: <br> <code> XRenderPictFormat *  XRenderFindVisualFormat(Display *  dpy, const Visual *  visual); </code>    */
+  public static boolean XRenderFindVisualFormat(long dpy, long visual, XRenderPictFormat dest)  {
+    if( dest == null ) {
+        throw new RuntimeException("dest is null");
+    }
+    final ByteBuffer destBuffer = dest.getBuffer();
+    if( !Buffers.isDirect(destBuffer) ) {
+        throw new RuntimeException("dest buffer is not direct");
+    }
+    return XRenderFindVisualFormat1(dpy, visual, destBuffer);
+  }
+  /** Entry point to C language function: <code> XVisualInfo *  XGetVisualInfo(Display * , long, XVisualInfo * , int * ); </code>    */
+  private static native boolean XRenderFindVisualFormat1(long dpy, long visual, ByteBuffer xRenderPictFormat);
+
+  
   /** Interface to C language function: <br> <code> XVisualInfo *  XGetVisualInfo(Display * , long, XVisualInfo * , int * ); </code>    */
   public static XVisualInfo[] XGetVisualInfo(long arg0, long arg1, XVisualInfo arg2, int[] arg3, int arg3_offset)
   {