Man page - sdl_setwindowopacity(3)

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Manual

SDL_SetWindowOpacity(3) SDL3 FUNCTIONS SDL_SetWindowOpacity(3)

SDL_SetWindowOpacity - Set the opacity for a window.

Defined in SDL3/SDL_video.h

#include "SDL3/SDL.h"
bool SDL_SetWindowOpacity(SDL_Window *window, float opacity);

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.

the window which will be made transparent or opaque.
the opacity value (0.0f - transparent, 1.0f - opaque).

Returns true on success or false on failure; call

SDL_GetError () for more information.

This function should only be called on the main thread.

This function is available since SDL 3.2.0.

•(3), SDL_GetWindowOpacity(3)

SDL 3.2.10 Simple Directmedia Layer