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[Merged by Bors] - bevy_pbr: Optimize assign_lights_to_clusters #3984

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[Merged by Bors] - bevy_pbr: Optimize assign_lights_to_clusters #3984

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superdump
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Objective

  • Optimize assign_lights_to_clusters

Solution

  • Avoid inserting entities into hash sets in inner loops when it is known they will be inserted in at least one iteration of the loop.
  • Use a Vec instead of a hash set where the set is not needed
  • Avoid explicit calculation of the cluster_index from x,y,z coordinates, instead using row and column offsets and just adding z in the inner loop
  • These changes cut the time spent in the system roughly in half

@superdump superdump self-assigned this Feb 18, 2022
@github-actions github-actions bot added the S-Needs-Triage This issue needs to be labelled label Feb 18, 2022
@superdump superdump added A-Rendering Drawing game state to the screen and removed S-Needs-Triage This issue needs to be labelled labels Feb 18, 2022
@alice-i-cecile alice-i-cecile added the C-Performance A change motivated by improving speed, memory usage or compile times label Feb 18, 2022
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LGTM!

robtfm added a commit to robtfm/bevy that referenced this pull request Feb 19, 2022
@robtfm
optimisations from bevyengine#3984 + comments
fe967ae
@robtfm robtfm mentioned this pull request Feb 19, 2022
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@mockersf mockersf added the S-Ready-For-Final-Review This PR has been approved by the community. It's ready for a maintainer to consider merging it label Feb 19, 2022
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cart commented Feb 28, 2022

bors r+

bors bot pushed a commit that referenced this pull request Feb 28, 2022
@superdump
bevy_pbr: Optimize assign_lights_to_clusters (#3984)
7866543 
# Objective

- Optimize assign_lights_to_clusters

## Solution

- Avoid inserting entities into hash sets in inner loops when it is known they will be inserted in at least one iteration of the loop.
- Use a Vec instead of a hash set where the set is not needed
- Avoid explicit calculation of the cluster_index from x,y,z coordinates, instead using row and column offsets and just adding z in the inner loop 
- These changes cut the time spent in the system roughly in half
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bors bot commented Feb 28, 2022

Pull request successfully merged into main.

Build succeeded:

@bors bors bot changed the title bevy_pbr: Optimize assign_lights_to_clusters [Merged by Bors] - bevy_pbr: Optimize assign_lights_to_clusters Feb 28, 2022
@bors bors bot closed this Feb 28, 2022
rparrett pushed a commit to rparrett/bevy that referenced this pull request Mar 4, 2022
@superdump @rparrett
bevy_pbr: Optimize assign_lights_to_clusters (bevyengine#3984)
ef656b5 
# Objective

- Optimize assign_lights_to_clusters

## Solution

- Avoid inserting entities into hash sets in inner loops when it is known they will be inserted in at least one iteration of the loop.
- Use a Vec instead of a hash set where the set is not needed
- Avoid explicit calculation of the cluster_index from x,y,z coordinates, instead using row and column offsets and just adding z in the inner loop 
- These changes cut the time spent in the system roughly in half
kurtkuehnert pushed a commit to kurtkuehnert/bevy that referenced this pull request Mar 6, 2022
@superdump
bevy_pbr: Optimize assign_lights_to_clusters (bevyengine#3984)
4657e7c 
# Objective

- Optimize assign_lights_to_clusters

## Solution

- Avoid inserting entities into hash sets in inner loops when it is known they will be inserted in at least one iteration of the loop.
- Use a Vec instead of a hash set where the set is not needed
- Avoid explicit calculation of the cluster_index from x,y,z coordinates, instead using row and column offsets and just adding z in the inner loop 
- These changes cut the time spent in the system roughly in half
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@alice-i-cecile alice-i-cecile alice-i-cecile approved these changes

@mockersf mockersf mockersf approved these changes

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@superdump superdump

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A-Rendering Drawing game state to the screen C-Performance A change motivated by improving speed, memory usage or compile times S-Ready-For-Final-Review This PR has been approved by the community. It's ready for a maintainer to consider merging it
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