<AWT Dev> [jdk17] RFR: 8266079: Lanai: AlphaComposite shows differences on Metal compared to OpenGL

[Jayathirth D V]

On Tue, 15 Jun 2021 16:57:00 GMT, Alexey Ushakov <avu at openjdk.org> wrote:

> Implemented blit via compute kernel

src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLLayer.m line 136:

> 134:         NSUInteger w = computePipelineState.threadExecutionWidth;
> 135: 
> 136:         // Workaround for some OS/device bug reporting incorrect maxTotalThreadsPerThreadgroup

@avu Do we know in which hardware we have this issue? Also do we have any reference to Apple bug?
Also if we use thread group as 1 what is the performance impact in such hardware?

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PR: https://git.openjdk.java.net/jdk17/pull/62