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Shokunin
f10db8a0f0
Opt-in under the render thread. Composed frames go to a ring of offscreen slots at the window's size (binds of framebuffer 0 on the composing context land on the current slot); a present thread with a second, shared context on the same window waits on the slot's fence, copies it 1:1 and swaps. The compositor's wait moves off rendering; the composing side waits only while every slot is queued or on screen. Falls back to direct swaps when the shared context or sync objects are unavailable. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>