renderer: pump events until the window is exposed on creation - #1818
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ranawaqas-ai wants to merge 1 commit into
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ranawaqas-ai wants to merge 1 commit into
ranawaqas-ai wants to merge 1 commit into
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macOS never delivers the first expose event unless the event loop runs before the first frame is drawn. Qt then refuses every buffer flush with "exposed size does not match geometry", so the window never receives content and stays 0x0 and invisible. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
TheJJ
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Sep 21, 2026
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thanks. while this also seems a weird workaround i think we can take it in for now.
i plan on switching to using a real qt window and then rendering inside it - our other way round has really caused too many problems.
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could you make the ci pass here as well, please? |
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On macOS the window never receives its first expose event, because nothing runs the event loop between
setVisible(true)and the first rendered frame. Qt then refuses every buffer flush withWindow exposed size does not match geometry (yet). Skipping flush to avoid visual artifacts., logged over 300,000 times in seven seconds, so the window never gets content and stays 0x0 and invisible.Reproduced on macOS 27 (arm64) with Qt 6.11.2 on every renderer demo. A plain QML window displays correctly on the same machine, so the problem is specific to this window setup rather than Qt on macOS.
Pumping events until
isExposed()returns true fixes it. Verified withrenderer_demo 0andrenderer_demo 3, both of which now open a visible 800x600 window.The
copying.mdauthors entry is included in #the shader PR from the same branch series.make checkmergepasses.