VAR and normal pointer not compatable?

OpenGL OpenGL: Advanced Coding
1

I just discovered that I can’t use a VAR allocated arrays with a normal allocated arrays.

This is what I did. I used glNormalPointer and glVertexPointer with VAR, and glTexCoordPointer with a normaly allocated array. All I got when I used glDrawElements was a really screwed up bunch of triangles scattered in the original shape of the model.

Is this suppose to happen?

2

That’s correct, you cannot mix memory like that.

It is actually mentionned in the specs.

3

Hi!

I don’t know the answer. But just a question: Why are you allocating the texcoords array outside the AGP memory??
If your app have to access both memories… it will slow down the process. Have it any sense?

-nemesis-

4

It’s only a temporary bit of code. I’m slowly converting my code to support multitexturing and multi UV layers, since my code isn’t set up in a streamlined way yet I just went ahead and used my normal system allocated texture array for now to debug the multi layered UVs.

I know now that when I use VAR, all the UV layers for a particular object will need to be allocated using VAR.

Thanks for clearing up my question BTW! I thought it was a bit odd that it was thrashing like it was…it freaked me out in fact because I didn’t know when the problem occured…and tracking down the problem took a while .