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On emscripten, is delta-x of mousewheel event scaled correctly? #10454

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madebr opened this issue Aug 2, 2024 · 4 comments
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On emscripten, is delta-x of mousewheel event scaled correctly? #10454

madebr opened this issue Aug 2, 2024 · 4 comments
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3.2.0

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@madebr
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madebr commented Aug 2, 2024

Whilst looking at imgui's SDL support code, I noticed it scales the wheel delta x of a mouse wheel event by around 100.
link to code

Is the need for this extra scale factor expected?
@icculus icculus self-assigned this Aug 2, 2024
@slouken
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slouken commented Oct 6, 2024

We probably need to divide the values coming in by 120. Take a look at the WHEEL_DELTA code in SDL_windowsevents.c for reference.

@slouken slouken added this to the 3.2.0 milestone Oct 6, 2024
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icculus commented Oct 6, 2024

I'll take a look at this.

icculus added a commit that referenced this issue Oct 24, 2024
@icculus
emscripten: scale mousewheel X coordinates correctly, not just Y coor…
00f15dd 
…dinates.

Fixes #10454.

(cherry picked from commit 4ea26a7)
icculus added a commit that referenced this issue Oct 24, 2024
@icculus
emscripten: scale mousewheel X coordinates correctly, not just Y coor…
5c9f370 
…dinates.

Fixes #10454.

(cherry picked from commit 00f15dd)
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icculus commented Oct 24, 2024

Actually it turns out 100 is the right value for the browser (rather, it's one of three possible units of measurement, and we handle them all).

But we were only adjusting the Y value and not the X value, which is why Dear Imgui has a hardcoded / 100 in there for X.

CC @ocornut: that extra division on Emscripten can be removed now for SDL3 (and the fix has been applied to SDL2, too, and will be in the 2.30.9 release).

ocornut added a commit to ocornut/imgui that referenced this issue Oct 24, 2024
@ocornut
Backends: SDL2, SDL3: SDL_EVENT_MOUSE_WHEEL event doesn't require div…
06092a9 
…iding by 100.0f on Emscripten. (#4019, #6096, #1463)

Ref libsdl-org/SDL#10454 (comment)
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ocornut commented Oct 24, 2024

Thank you Sam, pushed ocornut/imgui@06092a9 for Dear ImGui.

klukaszek pushed a commit to klukaszek/SDL that referenced this issue Nov 17, 2024
@icculus @klukaszek
emscripten: scale mousewheel X coordinates correctly, not just Y coor…
afad65d 
…dinates.

Fixes libsdl-org#10454.
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