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Remove redundant math in tonemapping. #9669

Merged
merged 1 commit into from
Sep 2, 2023
Merged

Remove redundant math in tonemapping. #9669

merged 1 commit into from
Sep 2, 2023

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DGriffin91
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@DGriffin91 DGriffin91 commented Sep 2, 2023 •
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Objective

  • Tony McMapface has some math that cancels out.

Solution

  • Remove it.

@JMS55 JMS55 added the A-Rendering Drawing game state to the screen label Sep 2, 2023
@JMS55 JMS55 added this to the 0.12 milestone Sep 2, 2023
alice-i-cecile
alice-i-cecile approved these changes Sep 2, 2023
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The math checks out.

@alice-i-cecile alice-i-cecile added C-Performance A change motivated by improving speed, memory usage or compile times C-Code-Quality A section of code that is hard to understand or change labels Sep 2, 2023
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JMS55 commented Sep 2, 2023

I'm not good enough at math to see this easily 😅, @DGriffin91 do you mind writing out the derivation for me?

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DGriffin91 commented Sep 2, 2023 •
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I'm not good enough at math to see this easily 😅, @DGriffin91 do you mind writing out the derivation for me?

This impl doesn't have the extra math: https://github.com/h3r2tic/tony-mc-mapface/blob/main/shader/tony_mc_mapface.hlsl
And I tested the output and it was the same either way.

@alice-i-cecile alice-i-cecile 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 Sep 2, 2023
@alice-i-cecile alice-i-cecile added this pull request to the merge queue Sep 2, 2023
Merged via the queue into bevyengine:main with commit e88b6c8 Sep 2, 2023
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@DGriffin91 DGriffin91 deleted the simplify_tony branch September 3, 2023 08:29
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rparrett commented Sep 4, 2023 •
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I have a feeling that the new version is more correct and the difference is too subtle for me to really make out, but the 3d examples are different before/after this PR. (testing on macos)

After:
lighting

Before:
lighting

Output from image-compare's "hybrid comparison"
lighting

edit: lighting seems more interesting.

rdrpenguin04 pushed a commit to rdrpenguin04/bevy that referenced this pull request Jan 9, 2024
@DGriffin91
Remove redundant math in tonemapping. (bevyengine#9669)
2d6d9b3 
# Objective

- Tony McMapface has some math that cancels out.

## Solution

- Remove it.
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@alice-i-cecile alice-i-cecile alice-i-cecile approved these changes

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A-Rendering Drawing game state to the screen C-Code-Quality A section of code that is hard to understand or change 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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