the window which will be made transparent or opaque.
the opacity value (0.0f - transparent, 1.0f - opaque).
true on success or false on failure; call SDL_GetError() for more information.
Threadsafety: This function should only be called on the main thread.
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Set the opacity for a window.
The parameter opacity will be clamped internally between 0.0f (transparent) and 1.0f (opaque).
This function also returns false if setting the opacity isn't supported.