SDL Wiki
(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)

SDL_SetWindowOpacity

Set the opacity for a window.

Syntax

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.

Remarks

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.

Version

This function is available since SDL 2.0.5.


CategoryAPI


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