Adjusting contrast / brightness

[mathgenius]

I'm just testing my game on another machine here; it's very dark with high contrast. I've noticed that some games allow adjusting of contrast / brightness parameters: how do they do that? Re-render all the textures ? Or is there an API for doing this (in directX/OpenGL/windowsXYZ) ?

Simon.

[oNyx]

http://www.flipcode.com/cgi-bin/msg.cgi?showThread=00000670&forum=3dtheory&id=-1

Search terms used:
opengl gamma ramp

HTH

[Donavon Keithley]

Direct3D: The SetGammaRamp function on the device.
Win32: SetDeviceGammaRamp