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Improper batching of non-mesh phase items. #14295

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james-j-obrien opened this issue Jul 13, 2024 · 0 comments · Fixed by #14296
Closed

Improper batching of non-mesh phase items. #14295

james-j-obrien opened this issue Jul 13, 2024 · 0 comments · Fixed by #14296
Labels
A-Rendering Drawing game state to the screen C-Bug An unexpected or incorrect behavior P-Regression Functionality that used to work but no longer does. Add a test for this!

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@james-j-obrien
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james-j-obrien commented Jul 13, 2024 •
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Bevy version

v0.14.0

What you did

Run bevy_vector_shapes examples with all features enabled.

What went wrong

The batch_range of custom phase items was being trampled causing failure to render, upon investigation I discovered that this was happening in the gpu_preprocessing variant of batch_and_prepare_sorted_render_phase. The result is non-deterministic due to system ordering.

When GFBD::get_index_and_compare_data() returns None it should skip batching for that item in it's entirety as it may already be being batched by some other pipeline. The batch_range of those items should not be modified.

I was able to mitigate the issue in the repro I have by adding this at line 426:

if current_batch_input_index.is_none() {
    continue;
}

There may be a more appropriate way to handle this in the context of mesh batching at large but the current behavior is definitely incorrect.

Additional information

Original bug: james-j-obrien/bevy_vector_shapes#42
@james-j-obrien james-j-obrien added C-Bug An unexpected or incorrect behavior S-Needs-Triage This issue needs to be labelled A-Rendering Drawing game state to the screen P-Regression Functionality that used to work but no longer does. Add a test for this! labels Jul 13, 2024
@james-j-obrien james-j-obrien mentioned this issue Jul 13, 2024
Merged
@alice-i-cecile alice-i-cecile added P-Regression Functionality that used to work but no longer does. Add a test for this! and removed P-Regression Functionality that used to work but no longer does. Add a test for this! S-Needs-Triage This issue needs to be labelled labels Jul 14, 2024
@rparrett rparrett mentioned this issue Jul 31, 2024
Closed
github-merge-queue bot pushed a commit that referenced this issue Aug 2, 2024
@james-j-obrien
Skip batching for phase items from other pipelines (#14296)
b98d15f 
# Objective

- Fix #14295

## Solution

- Early out when `GFBD::get_index_and_compare_data` returns None.

## Testing

- Tested on a selection of examples including `many_foxes` and
`3d_shapes`.
- Resolved the original issue in `bevy_vector_shapes`.
mockersf pushed a commit that referenced this issue Aug 2, 2024
@james-j-obrien @mockersf
Skip batching for phase items from other pipelines (#14296)
833ee3f 
# Objective

- Fix #14295

## Solution

- Early out when `GFBD::get_index_and_compare_data` returns None.

## Testing

- Tested on a selection of examples including `many_foxes` and
`3d_shapes`.
- Resolved the original issue in `bevy_vector_shapes`.
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A-Rendering Drawing game state to the screen C-Bug An unexpected or incorrect behavior P-Regression Functionality that used to work but no longer does. Add a test for this!
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Skip batching for phase items from other pipelines james-j-obrien/bevy
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@alice-i-cecile @james-j-obrien