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Games Have Brightness Option. How does this work?

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I do it by drawing a big white alpha blended quad over the screen to increase the brightness, or a big black quad to decrease the brightness.

There may be a better way using extensions, but I haven''t come across it.

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You can adjust your gamma using SetDeviceGammaRamp in windows
(see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/icm/icm_0yi8.asp)

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I believe the best way of doing this is to set the operating system''s gamma function/gamma ramp. When using SDL with OpenGL, you should be able to use SDL''s gamma wrapper functions SDL_SetGamma() and SDL_SetGammaRamp(). If you aren''t using SDL, you''ll have to use the X or the Win32 functions, respectively.

- JQ

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