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Offline erikd

JGO Ninja

Medals: 16
Projects: 4
Exp: 14 years


« Posted 2004-01-08 14:53:20 »

Why is it so important? I mean, I use it because I have to, I read the source to see what it does and the comments but I still can't quite see how it relates to the 'real world' so that I understand exactly why it is so important...

EDIT: To be more specific, why does it matter so much what the position, limit and mark is when I call some LWJGL function to get it to work right? Why isn't the data just read from begin to end anyway?

Maybe I'm just stupid  Embarrassed


Offline swpalmer

JGO Coder

Exp: 12 years

Where's the Kaboom?

« Reply #1 - Posted 2004-01-08 15:57:52 »

Buffer reuse maybe?  By fiddling with the current position you could avoid writing parts of structures that never change and leave them many structs in a single buffer.. making less garbage..?? I don't know..  I'm just guessing at potential benefits..

Offline cfmdobbie

Senior Devvie

Medals: 1

Who, me?

« Reply #2 - Posted 2004-01-08 18:50:54 »

To LWJGL, I believe mark is irrelevant.  Limit isn't being checked at the moment, but may be in the future?

Position is used C-side as (bufferBaseAddress + bufferPosition) to get the pointer to your data - so you can do exactly as SWP says, effectively allowing you to pass a pointer to one piece of data that is contained within a larger buffer.

As far as I'm aware, anyway!

(Edit: better wordage)

Hellomynameis Charlie Dobbie.
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