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


Set the brightness (gamma multiplier) for a given window's display.

Header File

Defined in SDL_video.h, but apps should only #include "SDL.h"!


int SDL_SetWindowBrightness(SDL_Window * window, float brightness);

Function Parameters

window the window used to select the display whose brightness will be changed
brightness the brightness (gamma multiplier) value to set where 0.0 is completely dark and 1.0 is normal brightness

Return Value

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


Despite the name and signature, this method sets the brightness of the entire display, not an individual window. A window is considered to be owned by the display that contains the window's center pixel. (The index of this display can be retrieved using SDL_GetWindowDisplayIndex().) The brightness set will not follow the window if it is moved to another display.

Many platforms will refuse to set the display brightness in modern times. You are better off using a shader to adjust gamma during rendering, or something similar.


This function is available since SDL 2.0.0.

See Also

CategoryAPI, CategoryAPIFunction

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