NEWT iOS: Support Multi-Touch Events, PixelScale, ..

Note: Two subsequent commit will add some required change in the
native UIWindow/UIView creation methods to actually make the NEWT view being displayed ;-)

The demo 'com.jogamp.opengl.demos.ios.Hello' demonstrated a standard NEWT application
running on iOS.
Previous NativeWindow wrap-around demo is preserved in 'com.jogamp.opengl.demos.ios.Hello1'.

Tested on ipad 11'inch arm64 and x86_64 simulation:
- Using GearsES2 demo
- PixelScale 1f, 2f and 0f - last two using max pixel scale
- Touch w/ GearsES2 works:
-- 1 finger rotate
-- 2 finger drag
-- 2 finger pinch-zoom gesture detection

1 files changed, 5 insertions, 0 deletions

diff --git a/src/newt/native/NewtCommon.c b/src/newt/native/NewtCommon.c
index d580012ef..ec10b2da5 100644
--- a/src/newt/native/NewtCommon.c
+++ b/src/newt/native/NewtCommon.c
@@ -27,6 +27,7 @@
  */
 #include "NewtCommon.h"
 #include <string.h>
+#include <math.h>
 
 static const char * const ClazzNameRuntimeException = "java/lang/RuntimeException";
 static jclass    runtimeExceptionClz=NULL;
@@ -166,3 +167,7 @@ void NewtCommon_ReleaseJNIEnv (int shallBeDetached) {
     }
 }
 
+int NewtCommon_isFloatZero(float f) {
+    // EPSILON = 1.1920929E-7f; // Float.MIN_VALUE == 1.4e-45f ; double EPSILON 2.220446049250313E-16d
+    return fabsf(f) < 1.1920929E-7f;
+}