Bug 1202 - Add support of Adaptive Vsync via [GLX|WGL]_EXT_swap_control_tear

[GLX|WGL]_EXT_swap_control_tear extensions support
asynchronous buffer swaps, i.e. adaptive Vsync.

<https://www.opengl.org/wiki/SwapInterval_aka_vsync#Adaptive_Vsync>
<https://www.opengl.org/registry/specs/EXT/wgl_swap_control_tear.txt>
<https://www.opengl.org/registry/specs/EXT/glx_swap_control_tear.txt>

<http://keithp.com/blogs/async_flip/>

The extensions utilizes a negative interval value,
enabling late swaps to occur without synchronization to the video frame.

Hence '-1' has new semantics, previously it was the 'default value'
of 'untouched vsync interval'.

New default is:
  - 0 for unrealized context
  - 1 for realized context

+++

It requires [GLX|WGL]_EXT_swap_control,
hence we shall ensure to use use this extension
in the implementation of GLContext.setSwapInterval(..).

+++

Mesa3D seems to support GLX_SGI_swap_control only.

+++

Implemented on Windows and X11.

+++

On GNU/Linux using NVidia driver w/ my setup(*), sadly the query
  GLX.glXQueryDrawable(displayHandle, drawable.getHandle(), GLX.GLX_LATE_SWAPS_TEAR_EXT, val);
always returns zero here, indicating async vsync is not supported.

(Queried the attribute for every frame in windowed or fullscreen mode)

Fullscreen
(*)
  - Debian 8
  - Kernel 3.16
  - KDE/Kwin
  - GL Version     4.5 (Core profile, arb, compat[ES2, ES3, ES31], FBO, hardware) - 4.5.0 NVIDIA 355.06 [GL 4.5.0, vendor 355.6.0 (NVIDIA 355.06)]
  - GL_RENDERER    GeForce GTX 660/PCIe/SSE2
  - Samsung U28D590 (DFP-4): Internal DisplayPort

+++

3 files changed, 3 insertions, 6 deletions

diff --git a/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtApplet1Run.java b/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtApplet1Run.java
index cd53294a1..6bf9f41a6 100644
--- a/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtApplet1Run.java
+++ b/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtApplet1Run.java
@@ -115,7 +115,7 @@ public class JOGLNewtApplet1Run extends Applet {
 
         String glEventListenerClazzName=null;
         String glProfileName=null;
-        int glSwapInterval=0;
+        int glSwapInterval=1;
         boolean glDebug=false;
         boolean glTrace=false;
         boolean glUndecorated=false;
diff --git a/src/newt/classes/com/jogamp/newt/util/applet/JOGLNewtAppletBase.java b/src/newt/classes/com/jogamp/newt/util/applet/JOGLNewtAppletBase.java
index cc159e6ed..c2cf64da2 100644
--- a/src/newt/classes/com/jogamp/newt/util/applet/JOGLNewtAppletBase.java
+++ b/src/newt/classes/com/jogamp/newt/util/applet/JOGLNewtAppletBase.java
@@ -291,10 +291,7 @@ public class JOGLNewtAppletBase implements KeyListener, GLEventListener {
                 _gl = _gl.getContext().setGL( GLPipelineFactory.create("com.jogamp.opengl.Trace", null, _gl, new Object[] { System.err } ) );
             } catch (final Exception e) {e.printStackTrace();}
         }
-
-        if(glSwapInterval>=0) {
-            _gl.setSwapInterval(glSwapInterval);
-        }
+        _gl.setSwapInterval(glSwapInterval);
     }
     @Override
     public void reshape(final GLAutoDrawable drawable, final int x, final int y, final int width, final int height) {
diff --git a/src/newt/classes/com/jogamp/newt/util/applet3/JOGLNewtApplet3Run.java b/src/newt/classes/com/jogamp/newt/util/applet3/JOGLNewtApplet3Run.java
index 9b9b7d532..fce43d71f 100644
--- a/src/newt/classes/com/jogamp/newt/util/applet3/JOGLNewtApplet3Run.java
+++ b/src/newt/classes/com/jogamp/newt/util/applet3/JOGLNewtApplet3Run.java
@@ -243,7 +243,7 @@ public class JOGLNewtApplet3Run implements Applet3 {
         }
         this.ctx = ctx;
         String glEventListenerClazzName=null;
-        int glSwapInterval=0;
+        int glSwapInterval=1;
         boolean glDebug=false;
         boolean glTrace=false;
         boolean glNoDefaultKeyListener = false;