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, 90 insertions, 0 deletions

diff --git a/src/jogl/classes/jogamp/opengl/ios/eagl/IOSEAGLDrawable.java b/src/jogl/classes/jogamp/opengl/ios/eagl/IOSEAGLDrawable.java
new file mode 100644
index 000000000..a851e60c6
--- /dev/null
+++ b/src/jogl/classes/jogamp/opengl/ios/eagl/IOSEAGLDrawable.java
@@ -0,0 +1,90 @@
+/**
+ * Copyright 2019 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+package jogamp.opengl.ios.eagl;
+
+import com.jogamp.nativewindow.NativeSurface;
+import com.jogamp.opengl.GL;
+import com.jogamp.opengl.GLContext;
+import com.jogamp.opengl.GLDrawableFactory;
+import com.jogamp.opengl.GLException;
+
+import jogamp.opengl.GLDrawableImpl;
+
+public abstract class IOSEAGLDrawable extends GLDrawableImpl {
+  public enum GLBackendType {
+    /** Default OpenGL Backend */
+    CAEAGL_LAYER(0);
+
+    public final int id;
+
+    GLBackendType(final int id){
+        this.id = id;
+    }
+  }
+
+  private boolean haveSetOpenGLMode = false;
+  private GLBackendType openGLMode = GLBackendType.CAEAGL_LAYER;
+
+  public IOSEAGLDrawable(final GLDrawableFactory factory, final NativeSurface comp, final boolean realized) {
+    super(factory, comp, realized);
+    initOpenGLImpl(getOpenGLMode());
+  }
+
+  @Override
+  protected void setRealizedImpl() {
+  }
+
+  @Override
+  protected void associateContext(final GLContext ctx, final boolean bound) {
+  }
+
+  @Override
+  protected final void swapBuffersImpl(final boolean doubleBuffered) {
+  }
+
+  // Support for "mode switching" as described in MacOSXCGLDrawable
+  public void setOpenGLMode(final GLBackendType mode) {
+      if (mode == openGLMode) {
+        return;
+      }
+      if (haveSetOpenGLMode) {
+        throw new GLException("Can't switch between using NSOpenGLPixelBuffer and CGLPBufferObj more than once");
+      }
+      setRealized(false);
+      if (DEBUG) {
+        System.err.println("MacOSXCGLDrawable: Switching context mode " + openGLMode + " -> " + mode);
+      }
+      initOpenGLImpl(mode);
+      openGLMode = mode;
+      haveSetOpenGLMode = true;
+  }
+  public final GLBackendType getOpenGLMode() { return openGLMode; }
+
+  protected void initOpenGLImpl(final GLBackendType backend) { /* nop */ }
+
+}