hg: lanai/lanai: 8234506: implement cleaning logic for textures pool

[Jayathirth Rao]

Hi Artem,

I was working on JDK-8233190 <https://bugs.openjdk.java.net/browse/JDK-8233190> to move main draw logic to QueueFlusher as we dont want to hold Appkit thread for longer durations.
To achieve that I made changes to create more than one command buffer per frame so that I can draw back buffer independent of final blit operation in Appkit.

But the change made in JDK-8234506 couples command buffer creation and release with texture creation and release. And I am not able to create commandbuffers as required and release textures when drawing is completed. I have attached the patch for JDK-8233190 <https://bugs.openjdk.java.net/browse/JDK-8233190> which can be applied without JDK-8234506 change and we see significant performance improvement. Performance numbers are captured in JDK-8233190 <https://bugs.openjdk.java.net/browse/JDK-8233190>.

Please let me know your thoughts about whether we can move back to old method of command buffer and texture management.

Thanks,
Jay



> On 20-Nov-2019, at 5:23 PM, artem.bochkarev at jetbrains.com wrote:
> 
> Changeset: b4f3e13ea1a0
> Author:    abochkarev
> Date:      2019-11-20 14:41 +0300
> URL:       https://hg.openjdk.java.net/lanai/lanai/rev/b4f3e13ea1a0
> 
> 8234506: implement cleaning logic for textures pool
> 
> * use Last-Recent-Used strategy
> * also optimized search of item
> * also add command buffer wrapper (that manages binded per-frame resources)
> 
> ! src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLBlitLoops.m
> ! src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLContext.h
> ! src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLContext.m
> ! src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLLayer.m
> ! src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLTexturePool.h
> ! src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLTexurePool.m
>