Multisampling and double buffers

OpenGL OpenGL: Basic Coding
1

Hi there,

I was just wondering how to calculate the VRAM bytes required when using multisampling (full screen anti-aliasing) and double buffers.

Anyone have the formula?

I’m mostly wanting to know what my VRAM requirements are given multiple sampling (4 samples), a resolution of 1920 x 1080, 32 bit colour (RGBA), 24 bit depth buffer and double buffering enabled.

Is it simply 4 * 1920 * 1080 * 4 * 3 * 2 / 1024 /1024 = ~190MB?

Cheers,
-C

2

A google turned this up (there’s a formula mid page):

http://www.nvnews.net/articles/fsaa/page_1.shtml

It’s old, but I believe it’s still representative of current hardware.

The IHV web sites have more up-to-date documentation on AA technology if you’re interested in that.

Cheers

3

Thanks, so I’m around 100MB- yikes! I’ll have to for-go multisampling!

Thanks again.

4

Sorry, forgot to ask - what are the IHV sites?

5

IHV = independent hardware vendor:
http://developer.nvidia.com/page/home.html
http://www.ati.com/developer/index.html
…

Cheers