Alan,
I am not sure this is a known issue. We'll need a lot more details.
What is your h+w and OS update ?
Is this all windows in an app or just the first one ?
Does it matter what the window content is ?
Any app or some specific app ?
-phil.
On 4/29/21 7:18 PM, Alan Snyder wrote:
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
