the window to get the current opacity value from.
the opacity, (0.0f - transparent, 1.0f - opaque), or -1.0f on failure; call SDL_GetError() for more information.
Threadsafety: This function should only be called on the main thread.
Page generated by adrdox
Get the opacity of a window.
If transparency isn't supported on this platform, opacity will be returned as 1.0f without error.