Reserving VBO memory twice


I’ve got a question about the usage of VBOs. One can allocate memory when calling glBufferDataARB. But what happens if I call this function twice for the same buffer (maybe with another size)? Is the old memory freed or do I have to worry about that by myself?

I haven’t found an explanation for this question so far… Maybe somebody knows something about that.

Thank you,

Sorry, I just found the answer in the specs. But I can swear that it wasn’t there berfore! :wink:

The glBufferData effectively creates a VBO. The garbage collection for unused data (that is, if you assign another data to an object id) is done automatically by OpenGL.