🚀 go-pugleaf

Maple Moose <maple-moose@home.com> wrote in message
news:OKeN3.2098$AX.75933@news1.rdc1.ab.home.com...
> I once ran across the calculation but had since forgotten it.  Could some
> one enlight me the math as to why V2 8MB or 12MB can
> only do 800X600 16 bit with Z buffer but could do
> 1024X768 16 bit without Z buffer?  I know about the 4MB frame buffer
> limit but couldn't get the math right.  Thanks.

You need to include an extra frame, for double-buffering (page-flipping).

800x600 x2 (bytes per pixel) x3 (2 image buffer and 1 Z-buffer) = 2.88 MB.

1024x768x2x3 = 4.7MB - too big to fit in 4MB.

Actually, at 800x600 there is enough room for triple-buffering:

800x600x2x4 = 3.84 MB.

--
Mike Smith

There are perhaps 5% of the population that simply *can't* think.
There are another 5% who *can*, and *do*.
The remaining 90% *can* think, but *don't*.
-- R. A. Heinlein