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<p class="MsoNormal"><span lang="EN-US">I’m glad the vanishing is not happening anymore, I will double check on these text rendering glitches then. Thanks for checking.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Yes, I did see the numbers, performance problems on discrete GPUs are a separate larger issue that I wanted to tackle after going through simpler functional issues first. I have some ideas on what to do to fix performance
on D3D12, but it will require time.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">-Lukasz<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-ligatures:none;mso-fareast-language:#0C00">From:</span></b><span lang="EN-US" style="mso-ligatures:none;mso-fareast-language:#0C00"> Christopher Schnick <crschnick@xpipe.io>
<br>
<b>Sent:</b> Friday, 28 November 2025 13:25<br>
<b>To:</b> Lukasz Kostyra <lukasz.kostyra@oracle.com><br>
<b>Cc:</b> OpenJFX <openjfx-dev@openjdk.org><br>
<b>Subject:</b> [External] : Re: JavaFX Direct3D 12 - Second EA release<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>I did not encounter the vanishing issue anymore with that build, so at least it is usable.<o:p></o:p></p>
<p>However, the font rendering issue still exists for some nodes:<o:p></o:p></p>
<p><img width="810" height="247" style="width:8.4375in;height:2.5729in" id="_x0000_i1026" src="cid:image001.png@01DC606E.C8E397A0"><o:p></o:p></p>
<p>It is not deterministic, meaning that if I just scroll the scrollpane forward and back, the same text might get rendered correctly.<o:p></o:p></p>
<p>Also, did you see the performance results I posted for my AMD system? Performance was quite bad there, so this is not in a stage where I can test this in production a bit.<o:p></o:p></p>
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<p class="MsoNormal">On 28/11/2025 12:41, Lukasz Kostyra wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span lang="PL">Hi Christopher,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="PL"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I just pushed a fix for JDK-8371995 onto direct3d12 branch in the sandbox -
<a href="https://urldefense.com/v3/__https:/github.com/openjdk/jfx-sandbox/tree/direct3d12__;!!ACWV5N9M2RV99hQ!KuiGt3yDg1iNtCswOA3yLUbPKFpTnRKQE9clxnsd6xQRhnGJLoz7c697JC77xG2Q4qwsMWDePar6hRx9DY1uTPpy$">
https://github.com/openjdk/jfx-sandbox/tree/direct3d12</a> . If you find a moment, could you build JFX from that branch and check if your app works correctly?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">-Lukasz</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-ligatures:none;mso-fareast-language:#0C00">From:</span></b><span lang="EN-US" style="mso-ligatures:none;mso-fareast-language:#0C00"> openjfx-dev
<a href="mailto:openjfx-dev-retn@openjdk.org"><openjfx-dev-retn@openjdk.org></a> <b>
On Behalf Of </b>Lukasz Kostyra<br>
<b>Sent:</b> Monday, 17 November 2025 15:14<br>
<b>To:</b> Christopher Schnick <a href="mailto:crschnick@xpipe.io"><crschnick@xpipe.io></a><br>
<b>Cc:</b> OpenJFX <a href="mailto:openjfx-dev@openjdk.org"><openjfx-dev@openjdk.org></a><br>
<b>Subject:</b> RE: Re: JavaFX Direct3D 12 - Second EA release</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I might’ve found the problem, there is an assertion that triggers when multiple text objects using different fonts are drawn. It could be related (AFAIK Label controls will eventually end up at the same text rendering
routines as Text nodes). Assertions are compiled out on Release for performance, so there is a chance it would corrupt the rendering without anything meaningful shown on screen.<br>
<br>
To track this I just filed <a href="https://bugs.openjdk.org/browse/JDK-8371995">
https://bugs.openjdk.org/browse/JDK-8371995</a> . I will check it and let you know when I fix it.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">On your side It might still be handy to build JFX in DebugNative, to confirm if the triggered assertion is the same and to later confirm if the fix is working for you too.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">-Lukasz</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-ligatures:none;mso-fareast-language:#0C00">From:</span></b><span lang="EN-US" style="mso-ligatures:none;mso-fareast-language:#0C00"> Christopher Schnick <<a href="mailto:crschnick@xpipe.io">crschnick@xpipe.io</a>>
<br>
<b>Sent:</b> Saturday, 15 November 2025 17:39<br>
<b>To:</b> Lukasz Kostyra <<a href="mailto:lukasz.kostyra@oracle.com">lukasz.kostyra@oracle.com</a>><br>
<b>Cc:</b> OpenJFX <<a href="mailto:openjfx-dev@openjdk.org">openjfx-dev@openjdk.org</a>><br>
<b>Subject:</b> Re: [External] : Re: JavaFX Direct3D 12 - Second EA release</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p>Forgot to add, there is nothing out of the ordinary printed in the verbose logs.<br>
<br>
If I find the time, I can look into compiling a debug build.<o:p></o:p></p>
<p>But the problem should be reproducible somehow when just automatically creating a lot of labels with random styles, sizes, and text. Some of them should break as they did for me.<o:p></o:p></p>
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<p class="MsoNormal">On 15/11/2025 17:34, Christopher Schnick wrote:<o:p></o:p></p>
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<p>Ok, so I had more time to debug it. The one weird thing I observed when it was working was that some labels have corrupted text rendering:<o:p></o:p></p>
<p><img border="0" width="810" height="501" style="width:8.4375in;height:5.2187in" id="Picture_x0020_1" src="cid:image002.png@01DC606E.C8E397A0"><o:p></o:p></p>
<p><br>
Not all of them, most are fine. There are no differences in terms of style classes etc. between the labels. When scrolling, the rendering sometimes switches between this corrupted and normal state after some delay.<br>
<br>
After a while I also figured out that text rendering is responsible for the issue of the nodes vanishing: Certain label contents broke the renderer. For example, in my application, the string "Password manager" when assigned to a label broke it and nothing
was rendered anymore. I tried to find an easy reproducer but was not able to. It's probably very dependent on all the different style classes that influence the text shape/size/etc.<o:p></o:p></p>
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<p class="MsoNormal">On 13/11/2025 16:30, Lukasz Kostyra wrote:<o:p></o:p></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="PL">Thanks for checking.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="PL"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">It is very possible the D3D12 runtime did not like something, could be related to your specific hardware. D3D12 by now has many extensions which differ depending on hardware and can lift certain restrictions - we already
internally had a case where one GPU had some restriction that was not enforced on another GPU and we had to accommodate that.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">The first step would be to try running D3D12 with “-Dprism.verbose=true -Dprism.debug=true”. These should print additional logs that might have some extra information.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">If there’s nothing useful there, next step would be to build JavaFX with -PCONF=DebugNative - this will compile shaders in Debug, add assertions and debug logs to the backend - and then run your app with D3D12 debug layers
and GPU debugging enabled by adding “-Dprsim.d3d12.debugLayers=true -Dprism.d3d12.gpuDebug=true”. Those will slow down the app significantly, but will also tell D3D12 to run additional API use and GPU use checks.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">If the problem happens during a render loop and debug layers catch it, there is a chance it will cascade into other errors and spam the console output - you can tell D3D12 debug layers to trigger an assertion on first
encountered error with “-Dprism.d3d12.breakOnError=true”.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I am running out of time today to check this myself, but if you find something let me know - I’ll try to reproduce the problem myself and we’ll see where we go from there.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Good luck!</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">- Lukasz</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-ligatures:none;mso-fareast-language:#0C00">From:</span></b><span lang="EN-US" style="mso-ligatures:none;mso-fareast-language:#0C00"> Christopher Schnick
<a href="mailto:crschnick@xpipe.io"><crschnick@xpipe.io></a> <br>
<b>Sent:</b> Thursday, 13 November 2025 16:11<br>
<b>To:</b> Lukasz Kostyra <a href="mailto:lukasz.kostyra@oracle.com"><lukasz.kostyra@oracle.com></a><br>
<b>Cc:</b> <a href="mailto:openjfx-dev@openjdk.org">openjfx-dev@openjdk.org</a><br>
<b>Subject:</b> [External] : Re: JavaFX Direct3D 12 - Second EA release</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p>I just tried to run a project with provided jmods and at some point, certain nodes are just not rendered anymore and the window contents vanish. But they render for a short period of time.<br>
<br>
There is no exception thrown as far as I can see, so not sure what you need for debugging.<br>
<br>
For testing, this is the built application with the d3d12 jmods that you can use to attempt to reproduce the problem:
<a href="https://urldefense.com/v3/__https:/we.tl/t-DJuX0BeqXm__;!!ACWV5N9M2RV99hQ!K0ztYeDtYFyIwxlmMB-9MDuvY7Xyd60-LuJK99hex3mclCWl29MJfnxkz2mmECxINzNr5bAdKvQ64O9Xn7hHbsl_$">
https://we.tl/t-DJuX0BeqXm</a> . It is built from these sources: <a href="https://urldefense.com/v3/__https:/github.com/xpipe-io/kickstartfx__;!!ACWV5N9M2RV99hQ!K0ztYeDtYFyIwxlmMB-9MDuvY7Xyd60-LuJK99hex3mclCWl29MJfnxkz2mmECxINzNr5bAdKvQ64O9Xn9_QfENu$">
https://github.com/xpipe-io/kickstartfx</a><o:p></o:p></p>
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<p class="MsoNormal">On 13/11/2025 14:40, Lukasz Kostyra wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hello openjfx-dev,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">The second Early Access(EA) build of JavaFX with the Windows Direct3D 12 rendering pipeline is now available at:
<a href="https://urldefense.com/v3/__https:/jdk.java.net/javafxdirect3d12/__;!!ACWV5N9M2RV99hQ!K0ztYeDtYFyIwxlmMB-9MDuvY7Xyd60-LuJK99hex3mclCWl29MJfnxkz2mmECxINzNr5bAdKvQ64O9Xnw7Bj6i8$">
https://jdk.java.net/javafxdirect3d12/</a><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Please test this bundle and share your feedback by:<o:p></o:p></p>
<p class="MsoNormal">- emailing <a href="mailto:openjfx-dev@openjdk.java.net">openjfx-dev@openjdk.java.net</a> or<o:p></o:p></p>
<p class="MsoNormal">- reporting issues via JBS[<a href="https://bugs.openjdk.org/">https://bugs.openjdk.org/</a>] or at
<a href="https://urldefense.com/v3/__https:/bugreport.java.com__;!!ACWV5N9M2RV99hQ!K0ztYeDtYFyIwxlmMB-9MDuvY7Xyd60-LuJK99hex3mclCWl29MJfnxkz2mmECxINzNr5bAdKvQ64O9Xn-g1RFIV$">
https://bugreport.java.com</a><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">This is the second EA release. The backend is feature-complete
<span lang="EN-US">and went through a first optimization pass</span>, but it <span lang="EN-US">
still </span>requires <span lang="EN-US">some </span>more testing <span lang="EN-US">
on more hardware variants </span>before we can consider it complete. As such, with this release we also would like to call for
<span lang="EN-US">help with </span>performance <span lang="EN-US">testing the backend
</span>(more details on that will be sent in a separate email thread).<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Known issues and pending tasks are captured on JBS and can be accessed using the filter provided on the Direct3D 12 EA page [<a href="https://urldefense.com/v3/__https:/jdk.java.net/javafxdirect3d12/__;!!ACWV5N9M2RV99hQ!K0ztYeDtYFyIwxlmMB-9MDuvY7Xyd60-LuJK99hex3mclCWl29MJfnxkz2mmECxINzNr5bAdKvQ64O9Xnw7Bj6i8$">https://jdk.java.net/javafxdirect3d12/</a>].
Before reporting a new bug, please review the existing issues to avoid duplicates.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Important Notes:<o:p></o:p></p>
<p class="MsoNormal">1. This is a Windows-specific feature, so only a Windows-specific bundle is provided.<o:p></o:p></p>
<p class="MsoNormal">2. The default rendering pipeline is set to d3d12. Use "-Dprism.order=d3d" or "-Dprism.order=sw" to select one of the other pipelines for comparison testing.<o:p></o:p></p>
<p class="MsoNormal">3. It is recommended to use JDK 25 or later.<o:p></o:p></p>
<p class="MsoNormal">4. At this stage D3D12 backend is feature-complete and went through the first phase of optimization.
<span lang="EN-US">I</span>t is worth noting <span lang="EN-US">that, while generally we noticed performance improvements,</span> it might not be
<span lang="EN-US">on par with D3D backend on every machine combo - </span>we already noted performance being worse on recent NVidia discrete GPUs [<a href="https://bugs.openjdk.org/browse/JDK-8370486">https://bugs.openjdk.org/browse/JDK-8370486</a>] and are
looking for solutions.<o:p></o:p></p>
<p class="MsoNormal">5. Issue behavior may vary across different hardware<span lang="EN-US">, so
</span>please provide detailed information, such as the output of "java -Dprism.verbose=true" or used hardware, when reporting or discussing issues.<o:p></o:p></p>
<p class="MsoNormal">6. Refer: Run HelloWorld using JavaFX SDK [<a href="https://urldefense.com/v3/__https:/openjfx.io/openjfx-docs/*install-javafx__;Iw!!ACWV5N9M2RV99hQ!K0ztYeDtYFyIwxlmMB-9MDuvY7Xyd60-LuJK99hex3mclCWl29MJfnxkz2mmECxINzNr5bAdKvQ64O9Xn8uMZKUY$">https://openjfx.io/openjfx-docs/#install-javafx</a>]<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">We look forward to your feedback.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Lukasz<o:p></o:p></p>
<p class="MsoNormal"><span style="mso-ligatures:none;mso-fareast-language:#0C00"> </span><o:p></o:p></p>
<p style="margin:5.0pt"><span style="font-size:10.0pt;color:black">Confidential- Oracle Internal</span><o:p></o:p></p>
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