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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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Set the opacity for a window.


int SDL_SetWindowOpacity(SDL_Window *window, float opacity);

Function Parameters

window the window which will be made transparent or opaque
opacity the opacity value (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.


The parameter opacity will be clamped internally between 0.0f (transparent) and 1.0f (opaque).

This function also returns -1 if setting the opacity isn't supported.


This function is available since SDL 3.0.0.

CategoryAPI, CategoryVideo, CategoryDraft

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