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Improve multithreading support for render command encoding #17733

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@PPakalns

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@PPakalns

What problem does this solve or what need does it fill?

Multi-threading support for rendering command encoding was added in #9172 .

Support for it was added to some subset of nodes. Currently for example MainOpaquePass2dNode has been parallelized, but MainTransparentPass2dNode has not been parallelized.

Parallelized command encoding is especially important for setups where multiple camera views are rendered. Currently graph is executed in serial and no parallelization is done for unsupported nodes.

What solution would you like?

Continue adding support for render node parallelization.

What alternative(s) have you considered?

Currently none.

Additional context

See discussion on discord rendering channel: https://discord.com/channels/691052431525675048/866787577687310356/1337553149208035359

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    A-RenderingDrawing game state to the screenC-FeatureA new feature, making something new possibleC-PerformanceA change motivated by improving speed, memory usage or compile timesS-Ready-For-ImplementationThis issue is ready for an implementation PR. Go for it!

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