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由 Chris Bracken 提交于
On iOS, backgrounded applications are not permitted to execute GPU work. See [1]. When backgrounding the application, we now tear down the underlying iOS render surface, and re-create when the app returns to foreground. See [2] for a Technica Q&A on GL-related crashes when rendering is attempted by a backgrounded application. [1]: https://developer.apple.com/library/content/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/ImplementingaMultitasking-awareOpenGLESApplication/ImplementingaMultitasking-awareOpenGLESApplication.html#//apple_ref/doc/uid/TP40008793-CH5-SW1 [2]: https://developer.apple.com/library/content/qa/qa1766/_index.html
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