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Prevent Windows borderless mode from taking exclusive fullscreen - #347
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cybersecurity merged 1 commit intoOct 19, 2026
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NVIDIA's OpenGL driver can treat SDL's popup fullscreen window as exclusive even when no display mode is selected, blanking the monitor on Alt+Tab. Clear popup and topmost styles for borderless windows before context creation and presentation, including after SDL restores them. Explicit fullscreen keeps its existing behavior. Checked: Windows release build; hidden native window probe covering styles, bounds, focus, repeated application and mode isolation; git diff --check. Live Alt+Tab was not tested. Android and web targets were unavailable; pytest was not installed.
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I personally was shown the difference via a live stream and believe this to be a needed quality of life improvement for Windows clients, however I was not able to pull in the code myself and test as I do not have a Windows machine to test with. I recommend cherry picking and testing. Steps:
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GuvenHuso
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…port Map facts in the Delta Stats batch
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Borderless mode can blank the monitor on Alt+Tab because NVIDIA's OpenGL driver treats SDL's popup fullscreen window as exclusive, even without a selected display mode.
Clear the popup and topmost styles for borderless windows before OpenGL context creation and presentation. Reapply this when SDL restores those styles after mode or focus changes. Explicit fullscreen retains its existing behavior.
Tested and working on an NVIDIA RTX 3090.