RFR: 8314820: Unify Screen adapter ordinal logic

[Marius Hanl]

On Tue, 16 Dec 2025 16:53:57 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> One thought nagged me during the review: why do we keep the ordinal (an index) when we could, in theory, keep a reference to the object? Is there a potential for misalignment, perhaps a transient one?

My guess: Because the purpose is to be an Identifier (ID) only, so that a Screen can be later mapped to a Pipeline, if needed. The `MTLPipeline` does not need that, but e.g. `D3DPipeline` does. I guess using an object therefore could be possible, but makes sense only for some pipelines still.

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PR Comment: https://git.openjdk.org/jfx/pull/2009#issuecomment-3664833001