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investigate clear color optimization + ubersdf #185711

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@gaaclarke

In wonderous I'm seeing 4 full screen draw rects at the beginning of a render pass. We implemented a clear color optimization that is supposed to handle cases like this, where it removes draw calls and instead collapses them in to the clear color for the render pass (

if (render_passes_.back().IsApplyingClearColor()) {
). We need to double check that the UberSDF did not break that.

Screen.Recording.2026-04-28.at.1.07.35.PM.mov

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    P2Important issues not at the top of the work liste: impellerImpeller rendering backend issues and features requeststeam-engineOwned by Engine teamtriaged-engineTriaged by Engine team

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