PRESENT-NG (v4) - #145
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No functional change, for now.
Move flip_pending, flip_active and unflip_event_id from per-Screen to per-CRTC present_crtc_priv. Replace global present_exec_queue and present_flip_queue with a per-CRTC exec_queue and flip_queue.
Add BlockHandler hook to present_screen_priv and wrap screen BlockHandler in present_screen_priv_init. Add stub present_scmd_block_handler that chains to saved handler. No functional change.
Move scheduling to per-Screen BlockHandler. Add present_scmd_replace_queued_per_crtc and present_scmd_block_handler that for each CRTC does exclusive coalescing, checks fence and flip state, arms vblank or executes when ready. Make present_scmd_pixmap enqueue-only.
Use QueueWorkProc to wake BlockHandler for wait fences, syncobj and vblank events. Keep flip completion immediate.
Merge per-CRTC exec and flip queues into a single queue with bypass for blocked flips. Keep TearFree guard and fake queue global.
Enqueue was not waking server, so first frame with exec_msc <= crtc_msc never armed a vblank fd and stayed in poll. Queue work to run BlockHandler.
Call AdjustWaitForDelay 0 when no candidate due to fence or pending flip, so poll does not sleep with work queued.
Use RegisterBlockAndWakeupHandlers per Screen with data=ScreenPtr. Remove ScreenBlockHandler wrap. Keep single scan and non-NULL wakeup.
Schedule future presents via queue_vblank and bound poll when blocked. Keep single scan per CRTC.
Use WakeupHandler for immediate work (exec <= msc). BlockHandler schedules future via queue_vblank.
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Highly draft and experimental, won't be shipped until 27.1.