RFR: 8258754: Gracefully fallback to the OpenGL rendering pipeline if Metal rendering pipeline initialization fails [v8]

[Phil Race]

On Fri, 15 Jan 2021 11:14:25 GMT, Ajit Ghaisas <aghaisas at openjdk.org> wrote:

>> This implements fallback to the OpenGL rendering pipeline if Metal rendering pipeline initialization fails.
>> I have tested this fallback on 10.15.4 by stubbing code. We need real testing on a system where Metal is not available.
>
> Ajit Ghaisas has updated the pull request incrementally with one additional commit since the last revision:
> 
>   handle invalid requests to use default pipeline

src/java.desktop/macosx/classes/sun/java2d/macos/MacOSFlags.java line 115:

> 113:                     } else if (metalState == PropertyState.ENABLED) {
> 114:                         if (oglState == PropertyState.ENABLED) {
> 115:                             oglEnabled = true;

By adding the invalid state handling further up, this condition can never be true

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PR: https://git.openjdk.java.net/lanai/pull/147