Experimental Realtime GPU Compositor immediate crash on updating image datablocks in frame change handler #109676

New Issue

Julieta Riley · 2023-07-04T01:43:32+02:00

Julieta Riley commented

2023-07-04 01:43:32 +02:00

System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 535.98

Blender Version
Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-06-30 00:04, hash: e73a9a6a7d7b
Worked: (not applicable (new feature not available in earlier builds of blender to my knowledge))

Short description of error
Immediate crash when updating image datablocks during playback.

Exact steps for others to reproduce the error

The addon is a simplified version of an 8000 line addon. In a nutshell:

in the handlers.py line 34's update on frame change function is called by the bpy.app.handlers.frame_change_post, it:

mutes the render layer and composite node
calls scene_helpers.update_rendered_image_paths() to load the new EXR into the datablock used by the image node.
after playback the muted nodes are unmuted.

Don't worry about the rest of the addon, just the functions called from the frame change handler need to be considered.

This is similar to #109168, but this only affects the new real time gpu compositor.

steps to reproduce:

Install attached addon
open blend file with load UI option so that it opens in compositor worskpace with backdrop enabled.
don't turn on experimental compositors yet
press the spacebar to begin playback. Each frame the image node's image datablock will load in the correct EXR for that frame, which will be shown updating in the compositor backdrop during playback.
now enable the experimental compositors in preferences/experimental
In the compositor's n panel/options, try enabling full frame and then start playback (should work fine)
now try enabling 'realtime GPU'
instead of staring playback, move one frame at a time using the arrow keys (this will work fine)
now try playback - - IMMEDIATE ACCESS VIOLATION

Thanks
Julieta

**System Information** Operating system: Windows-10-10.0.19044-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 535.98 **Blender Version** Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-06-30 00:04, hash: `e73a9a6a7d7b` Worked: (not applicable (new feature not available in earlier builds of blender to my knowledge)) **Short description of error** Immediate crash when updating image datablocks during playback. **Exact steps for others to reproduce the error** The addon is a simplified version of an 8000 line addon. In a nutshell: in the handlers.py line 34's update on frame change function is called by the bpy.app.handlers.frame_change_post, it: - mutes the render layer and composite node - calls scene_helpers.update_rendered_image_paths() to load the new EXR into the datablock used by the image node. - after playback the muted nodes are unmuted. Don't worry about the rest of the addon, just the functions called from the frame change handler need to be considered. This is similar to https://projects.blender.org/blender/blender/issues/109168, but this only affects the new real time gpu compositor. steps to reproduce: 1. Install attached addon 2. open blend file with load UI option so that it opens in compositor worskpace with backdrop enabled. 3. don't turn on experimental compositors yet 4. press the spacebar to begin playback. Each frame the image node's image datablock will load in the correct EXR for that frame, which will be shown updating in the compositor backdrop during playback. 5. now enable the experimental compositors in preferences/experimental 6. In the compositor's n panel/options, try enabling full frame and then start playback (should work fine) 7. now try enabling 'realtime GPU' ![image](/attachments/cdc10852-cf4d-4f8a-9894-f30d52119ec4) 8. instead of staring playback, move one frame at a time using the arrow keys (this will work fine) 9. now try playback - - IMMEDIATE ACCESS VIOLATION Thanks Julieta

blneder_4_0_access_violation_frame_change_handler.zip

93 KiB

image.png

170 KiB

gpu compositor execution mode bug.zip

1.9 MiB

Julieta Riley added the