How do you setup brightness/contrast in OpenGL

Your post is a bit vague, but i think this is what you mean.

glcolor3f(0.2f,0.0f,0.0f) is a dull red
glcolor3f(1.0f,0.0f,0.0f) is a bright red

In most games you can go to options menu and set brightness/contrast of the entire screen, so everything you rendered looks brighter

it could be that the brightness is a float that is changed from 0 dark to 1 bright, and then all colors are multiplied by this value.

eg

glColor3f(0.0f*brightness,1.0f*brightness,0.25f * brightness);

otherwise, Im not sure

Quote: Original post by ZaphodBeebelbrox
In most games you can go to options menu and set brightness/contrast of the entire screen, so everything you rendered looks brighter

No, in most games you can set the gamma value, it basicly adjusts the output so that the game is playable eventhough you have a monitor that tend to be a little to dark or to bright.
You can't set the contrast trough application (unless you write a shader for it that is).
It is only on the controls in your drivers or monitor that can adjust the correct brightness/contrast values.

You can blend an additive layer of white, on top of your scene ;)

Most games adjust the gamma though the OS API.

It's pretty easy, i have some windows gamma adjusting code if you want it.

@skow

of course I want it