I am seeing some unusual behavior (in b20) that I do not see using OpenGL (or using JDK 16).
Sometimes when I open a new window, the window appears blank (except for the title bar) for about two seconds before the content appears. This behavior is not consistent. Opening another instance of the same window might be fast or slow. It happens with a variety of window classes. In JDK16 and using OpenGL, the content always appears immediately. > On Apr 23, 2021, at 1:13 PM, Philip Race <philip.r...@oracle.com> wrote: > > FYI to the wider community that may not subscribe to the client mailing > lists, nor appreciate too much cross-posting. > > -phil. > > > -------- Forwarded Message -------- > Subject: Heads up : JDK 17 b19 through b22 will use Metal instead of > OpenGL for Java 2D rendering on macOS. > Date: Fri, 23 Apr 2021 13:10:46 -0700 > From: Philip Race <philip.r...@oracle.com> > To: 2d-dev@openjdk.java.net <2d-dev@openjdk.java.net> > CC: lanai-...@openjdk.java.net, swing-...@openjdk.java.net > <swing-...@openjdk.java.net>, awt-...@openjdk.java.net > <awt-...@openjdk.java.net> > > > > > Heads up to anyone who is testing JDK 17 for running apps on macOS. > Starting with build 19 [1], JDK 17 for macOS is *temporarily* switched from > using OpenGL > to using Apple's Metal API for Java 2D rendering. This should be invisible to > applications. > We expect to revert this temporary switch in JDK 17 build 23,meaning b22 will > be the last build with Metal as default. > > See JEP 382 [2] for more information about how Metal is used by JDK. > > If you are running any kind of 2D / Swing/ AWT UI application on macOS, and > see any rendering related problems > starting with JDK 17 b19, please do report them to us at either the usual bug > submission channel [3], > or on the 2d-dev@openjdk.java.net OpenJDK mailing list [4] > Please be ready to provide us with a test case and screen shots. > > You may also set "-Dsun.java2d.opengl=true" to re-enable OpenGL - which > implicitly disables Metal - > to confirm that any problem you see is a Metal related rendering glitch. > > I will also forward this email to jdk-...@openjdk.java.net > > -Phil. > > [1] https://jdk.java.net/17/ > [2] https://openjdk.java.net/jeps/382 <https://openjdk.java.net/jeps/382> > [3] https://bugreport.java.com/bugreport/ > [4] https://mail.openjdk.java.net/mailman/listinfo/2d-dev >
