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Subdivision Surface: fix a serious performance hit when mixing CPU & GPU. #104441

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Alexander Gavrilov merged 1 commits from angavrilov/blender:pr-subdiv-gpu-cpu-conflict into main 2023-02-08 10:27:24 +01:00
Conversation 3 Commits 1 Files Changed 4 +55 -16
Alexander Gavrilov commented 2023-02-07 22:35:57 +01:00
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Subdivision surface efficiency relies on caching pre-computed topology
data for evaluation between frames. However, while eed45d2a23
introduced a second GPU subdiv evaluator type, it still only kept
one slot for caching this runtime data per mesh.

The result is that if the mesh is also needed on CPU, for instance
due to a modifier on a different object (e.g. shrinkwrap), the two
evaluators are used at the same time and fight over the single slot.
This causes the topology data to be discarded and recomputed twice
per frame.

Since avoiding duplicate evaluation is a complex task, this fix
simply adds a second separate cache slot for the GPU data, so that
the cost is simply running subdivision twice, not recomputing topology
twice.

To help diagnostics, I also add a message to show when GPU evaluation
is actually used to the modifier panel. Two frame counters are used
to suppress flicker in the UI panel.

Differential Revision: https://developer.blender.org/D17117

Subdivision surface efficiency relies on caching pre-computed topology data for evaluation between frames. However, while eed45d2a239a introduced a second GPU subdiv evaluator type, it still only kept one slot for caching this runtime data per mesh. The result is that if the mesh is also needed on CPU, for instance due to a modifier on a different object (e.g. shrinkwrap), the two evaluators are used at the same time and fight over the single slot. This causes the topology data to be discarded and recomputed twice per frame. Since avoiding duplicate evaluation is a complex task, this fix simply adds a second separate cache slot for the GPU data, so that the cost is simply running subdivision twice, not recomputing topology twice. To help diagnostics, I also add a message to show when GPU evaluation is actually used to the modifier panel. Two frame counters are used to suppress flicker in the UI panel. Differential Revision: https://developer.blender.org/D17117
Alexander Gavrilov requested review from Campbell Barton 2023-02-07 22:37:15 +01:00
Alexander Gavrilov requested review from Brecht Van Lommel 2023-02-07 22:37:30 +01:00
Alexander Gavrilov force-pushed pr-subdiv-gpu-cpu-conflict from 4b4e8ad190 to bf214a0bdf 2023-02-07 22:41:49 +01:00 Compare
Brecht Van Lommel refused to review 2023-02-07 22:47:02 +01:00
Brecht Van Lommel removed review request for Campbell Barton 2023-02-07 22:47:02 +01:00
Brecht Van Lommel requested review from Kévin Dietrich 2023-02-07 22:47:03 +01:00
Brecht Van Lommel requested review from Campbell Barton 2023-02-07 22:47:26 +01:00
Brecht Van Lommel removed review request for Kévin Dietrich 2023-02-07 22:47:26 +01:00
Brecht Van Lommel removed review request for Campbell Barton 2023-02-07 22:48:49 +01:00
Brecht Van Lommel requested review from Kévin Dietrich 2023-02-07 22:48:49 +01:00
Brecht Van Lommel commented 2023-02-07 22:49:24 +01:00
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Sorry about that, I'm trying to assign multiple reviewers but it's not letting me, something else to be fixed.

Sorry about that, I'm trying to assign multiple reviewers but it's not letting me, something else to be fixed.
Brecht Van Lommel commented 2023-02-07 23:03:09 +01:00
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@blender-bot build

@blender-bot build
Blender Bot commented 2023-02-07 23:03:12 +01:00
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Build started.

Build started.
Brecht Van Lommel requested changes 2023-02-07 23:09:58 +01:00
source/blender/modifiers/intern/MOD_subsurf.cc
@ -418,0 +435,4 @@
if (runtime_data && runtime_data->used_gpu) {
if (runtime_data->used_cpu) {
uiItemL(layout, "Using both CPU and GPU subdivision!", ICON_ERROR);
Brecht Van Lommel commented 2023-02-07 23:06:16 +01:00
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Leave out the exclamation mark, we should generally not use them in UI text unless it's something really critical.

Leave out the exclamation mark, we should generally not use them in UI text unless it's something really critical.
Brecht Van Lommel commented 2023-02-07 23:11:16 +01:00
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Also this is not really an error, at most a warning but even then would still go with ICON_INFO.

It's not something users are able to fix in generally, some setup just require it with our current implementation.

Also this is not really an error, at most a warning but even then would still go with ICON_INFO. It's not something users are able to fix in generally, some setup just require it with our current implementation.
angavrilov marked this conversation as resolved
Alexander Gavrilov force-pushed pr-subdiv-gpu-cpu-conflict from bf214a0bdf to d8bb0d329c 2023-02-08 07:59:56 +01:00 Compare
Brecht Van Lommel approved these changes 2023-02-08 09:15:10 +01:00
Kévin Dietrich approved these changes 2023-02-08 10:20:33 +01:00
Alexander Gavrilov merged commit 4d3bfb3f41 into main 2023-02-08 10:27:24 +01:00
Alexander Gavrilov deleted branch pr-subdiv-gpu-cpu-conflict 2023-02-08 10:27:25 +01:00
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