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this variable was added in commit 2067a7db8e4a36ba40ab34a55b3166ca28638a60 and ultimately tracks if this is a surface's first present. checking if the current bo is NULL provides the same functionality and cuts down on a redundant piece of state potentially getting out of sync in the future
Simple DirectMedia Layer (SDL) Version 2.0
Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting with README.md
Enjoy!
Sam Lantinga (slouken@libsdl.org)
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