Fix T95644: Cycles doesn't update modified object attributes on GPU
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Authored by Lukas Stockner (lukasstockner97) on Apr 30 2022, 10:23 PM.

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Brecht Van Lommel (brecht)
Sergey Sharybin (sergey)

Maniphest Tasks

T95644: Regression: Cycles preview doesn't refresh viewport with animated colors in custom property (on GPU, CPU is fine)

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rB0fa1c65ee30d: Fix T95644: Cycles doesn't update modified object attributes on GPU

Summary

From what I can tell, device_update_preprocess is supposed to detect modified attributes and flag the device_vector for a copy through device_update_flags.

However, since object attributes are only created in device_update_attributes afterwards, they can't be included in that check.

Therefore, I've changed the function that actually updates the device_vector to tag it as modified as soon as its content gets updated.

This fixes the issue, but I'm submitting this as a patch just to make sure that I'm not missing a larger design consideration here.
Also, I feel like with this change, we can actually get rid of the device_update_flags modification tracking altogether?

Diff Detail

Repository: rB Blender

Event Timeline

Lukas Stockner (lukasstockner97) requested review of this revision.Apr 30 2022, 10:23 PM

Lukas Stockner (lukasstockner97) created this revision.

Harbormaster completed remote builds in B21915: Diff 51034.Apr 30 2022, 10:23 PM

Lukas Stockner (lukasstockner97) added a task: T95644: Regression: Cycles preview doesn't refresh viewport with animated colors in custom property (on GPU, CPU is fine).Apr 30 2022, 10:24 PM

As far as I can tell we can indeed use this indeed of modification tracking in device_update_flags.

Can you try removing that code and see if things still work?

This revision is now accepted and ready to land.May 2 2022, 3:07 PM

The code seems reasonable, although not really something where I know every detail.
Getting rid of device_update_flags sounds great, although can/should happen outside of this fix it feels.

Closed by commit rB0fa1c65ee30d: Fix T95644: Cycles doesn't update modified object attributes on GPU (authored by Lukas Stockner (lukasstockner97), committed by Brecht Van Lommel (brecht)). · Explain WhyMay 4 2022, 8:18 PM

This revision was automatically updated to reflect the committed changes.

Brecht Van Lommel (brecht) added a commit: rB0fa1c65ee30d: Fix T95644: Cycles doesn't update modified object attributes on GPU.