METAL 3.6 - Object "flashes" on certain mouse events with GPU Backend #106704
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Reference: blender/blender#106704
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System Information
Operating system: MacOs 13.3
Graphics card: M1 Max
Blender Version
Broken: Latest 3.6s
Worked: 3.5 LTS
Short description of error
Objects "flash" on certain mouse events (edit vertex/points), moving mouse to and from 3D Viewport, drawing a stroke... This is more noticeable on Grease Pencil objects.
Exact steps for others to reproduce the error
See video.
. Make sure you are configured with Metal GPU Backend.
. Create Filled Stroke in Grease Pencil.
. Move mouse around viewport elements, or go into Edit Mode and move points...
. Filled objects flashes intermittently.
. It's very annoying :)
METAL 3.6 - Object "flashes" on certain mouse events with GPU Backendto InterestMetal METAL 3.6 - Object "flashes" on certain mouse events with GPU BackendInterestMetal METAL 3.6 - Object "flashes" on certain mouse events with GPU Backendto METAL 3.6 - Object "flashes" on certain mouse events with GPU BackendI can confirm the problem, but the glitch occurs much less frequently than shown in the video.
System Information
Operating system: macOS-13.2.1-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M1 1.2
Also able to reproduce. This appears to be an undesired side-effect of a fix to the issue which could cause the viewport to freeze and timeout under certain circumstances.
This is to do with GPU workload ordering. Previously, the code enforced strict render command ordering, such that all rendering must occur in explicit order. However this meant that certain async work may not get correctly scheduled and would time out. The solution relaxed this across frame boundaries, and uses Metal's built-in dependency resolution, however, it appears that occasionally, specifically with regard to panels being blitted to the swap chain drawable, the drawable gets displayed before all bits have finished executing.
This is partially a consequence of panels being updated on-demand. One possible solution I will look into is whether we can insert additional GPU synchronisation targeting this specific scenario.