iOS: Initial working commit supporting iOS (ipad pro 11)

using our OpenJFK 9 x86_64 and arm64 build.

Test demo class is 'com.jogamp.opengl.demos.ios.Hello',
residing in the new demo folder 'src/demos/com/jogamp/opengl/demos/ios/Hello.java'.

This commit does not yet include a working NEWT
specialization for iOS, but it shall followup soon.

Instead this commit demonstrates JOGL operating on
native UIWindow, UIView and CAEAGLLayer as provided by
Nativewindow's IOSUtil.

Test Video https://www.youtube.com/watch?v=Z4lUQNFTGMI

+++

Notable bug: The FBO used and sharing the COLORBUFFER RENDERBUFFER
memory resources with CAEAGLLayer to be displayed in the UIView
seemingly cannot handle GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24
or GL_DEPTH_COMPONENT32 depth buffer - none at all (Device + Simulation).

Therefor the default demo GLEventListener chosen here
don't require a depth buffer ;-)

This issue can hopefully be mitigated with other means
than using a flat FBO sink similar to FBO multisampling.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/jogl/classes/jogamp/opengl/GLFBODrawableImpl.java b/src/jogl/classes/jogamp/opengl/GLFBODrawableImpl.java
index cddaebe25..64cca7bdd 100644
--- a/src/jogl/classes/jogamp/opengl/GLFBODrawableImpl.java
+++ b/src/jogl/classes/jogamp/opengl/GLFBODrawableImpl.java
@@ -87,17 +87,17 @@ public class GLFBODrawableImpl extends GLDrawableImpl implements GLFBODrawable {
      * @param parent
      * @param surface
      * @param fboCaps the requested FBO capabilities
-     * @param textureUnit
+     * @param textureUnit if valid, i.e. >= 0, signals {@link #FBOMODE_USE_TEXTURE}, otherwise a color renderbuffer is assumed
      */
     protected GLFBODrawableImpl(final GLDrawableFactoryImpl factory, final GLDrawableImpl parent, final NativeSurface surface,
                                 final GLCapabilitiesImmutable fboCaps, final int textureUnit) {
         super(factory, surface, fboCaps, false);
         this.initialized = false;
-        this.fboModeBits = FBOMODE_USE_TEXTURE;
+        this.fboModeBits = textureUnit>=0 ? FBOMODE_USE_TEXTURE : 0;
 
         this.parent = parent;
         this.origParentChosenCaps = getChosenGLCapabilities(); // just to avoid null, will be reset at initialize(..)
-        this.texUnit = textureUnit;
+        this.texUnit = textureUnit>=0 ? textureUnit : 0;
         this.samples = fboCaps.getNumSamples();
         this.fboResetQuirk = false;
         this.swapBufferContext = null;