[OpenJDK 2D-Dev] Heads up : JDK 17 b19 through b22 will use Metal instead of OpenGL for Java 2D rendering on macOS.

[Philip Race]

 > I’ve only tried a couple of apps and only this test program has shown 
the problem.

Did you try to attach something ? the lists strip attachments.
Sent it directly to me and I'll see if I can add it to a bug report.

-phil.

On 5/6/21 2:50 PM, Alan Snyder wrote:
>
>> On May 6, 2021, at 1:45 PM, Philip Race <philip.race at oracle.com> wrote:
>>
>> Alan,
>>
>> I am not sure this is a known issue. We'll need a lot more details.
> I figured you would. :-)
>
>
>> What is your h+w and OS update ?
> iMac 27 inch 2020 Radeon Pro 5500 XT 8 GB
> 11.3.1
>
>
>> Is this all windows in an app or just the first one ?
> Definitely not just the first one, but not all of them, either.
>
>
>> Does it matter what the window content is ?
> It might. The app is a test program that can create any of 30 different kinds of windows on demand.
>
> So far, I’ve seen the problem in 11 kinds of windows but not in the others. No obvious pattern in the content.
>
> The problem is most likely to happen the first time a given window is shown, but it can also happen on later instances of the same kind of window.
> I just tried a new kind of window and it happened the first 3 times, but not the 4th, then about 50% of the time.
> I tried creating a different window about 25 times, and it happened on #1, #4, and #25.
>
>> Any app or some specific app ?
> I’ve only tried a couple of apps and only this test program has shown the problem.
>
>
>
>> -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.race at 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.race at oracle.com>
>>>> To: 	2d-dev at openjdk.java.net <2d-dev at openjdk.java.net>
>>>> CC: 	lanai-dev at openjdk.java.net, swing-dev at openjdk.java.net <swing-dev at openjdk.java.net>, awt-dev at openjdk.java.net <awt-dev at 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 at 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-dev at 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
>>>>