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(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


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Get the opacity of a window.


int SDL_GetWindowOpacity(SDL_Window *window, float *out_opacity);

Function Parameters

window the window to get the current opacity value from
out_opacity the float filled in (0.0f - transparent, 1.0f - opaque)

Return Value

Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.


If transparency isn't supported on this platform, opacity will be reported as 1.0f without error.

The parameter opacity is ignored if it is NULL.

This function also returns -1 if an invalid window was provided.


This function is available since SDL 3.0.0.

CategoryAPI, CategoryVideo, CategoryDraft

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