Unable to choose visual

OpenGL
1

I am using open GL on RedHat 7.3. When I
am using the call glXChooseVisual. It is
returning NULL, so I could not proceed
further.

My video card is having 8 MB RAM and depth
is 24 bit and resolution is 1280x1024 pixels.

What could be the reason. Do I have to
change the graphics card or something else
Please advice me on this regard

Thanks in advance

B. Prabakaran
Bangalore

2

What attributes are you using and what is the name of your video card? (ie. what chip can be found on top of it)

3

I am using GLX_RGBA (attributes) and the graphics card is from ATI Technologies.

Do you need any more information

B. Prabakaran

4

Are you only using GLX_RGBA as attribute?

If so, try using the following instead of only GLX_RGBA:

attribList = {
GLX_RGBA,
GLX_DOUBLEBUFFER,
GLX_RED_SIZE, 4,
GLX_GREEN_SIZE, 4,
GLX_BLUE_SIZE, 4,
None
}

If you still don’t get a valid visual in return you can try removing the GLX_DOUBLEBUFFER attribute.
(which will give you a single buffer)

5

What does glxinfo say?

6

Try “GLX_ALPHA_SIZE, 0” as an attribute. Sometimes, this seems to help.

7

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