Fix reversed analog-stick Y-axis on iOS controllers - #512
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The native GameController bridge in StreamerView.payload(for:) forwarded raw thumbstick Y values to the embedded streamer JS. Apple's GameController framework reports Y as up = +1, but the streamer JS (normalizeGamepadAxis(-(axes[1]))) expects the W3C browser convention (up = -1) and negates Y itself — so the value was double-inverted, reversing Y on both sticks. Negating Y in the Swift bridge converts to the browser convention at the source, so up/down match again. Verified on a device build: both sticks now correct.
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Hi @n-elnouby, thank you for the PR! Please provide a video demonstrating this fix. |
Kief5555
approved these changes
Jun 17, 2026
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Pull request overview
This PR fixes inverted vertical (Y) thumbstick input for iOS GameController-based controllers by aligning the native Swift bridge’s axis sign convention with the W3C browser Gamepad convention expected by the embedded streamer JavaScript.
Changes:
- Negate
leftThumbstick.yAxis.valueandrightThumbstick.yAxis.valuein the native controller payload to convert iOS “up = +1” into browser “up = -1”. - Preserve existing clamping and payload shape so the embedded JS mapping continues to work as-is.
Collaborator
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Actually, LGTM. Thank you for the PR! |
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The native GameController bridge in StreamerView.payload(for:) forwarded raw thumbstick Y values to the embedded streamer JS. Apple's GameController framework reports Y as up = +1, but the streamer JS (normalizeGamepadAxis(-(axes[1]))) expects the W3C browser convention (up = -1) and negates Y itself — so the value was double-inverted, reversing Y on both sticks.
Negating Y in the Swift bridge converts to the browser convention at the source, so up/down match again. Verified on a device build: both sticks now correct.
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