Re: Why V2 8MB can only do 800x600?

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#326

From: Andrew Hodgson
Date: Thu, 14 Oct 1999 00:00

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You need a certain number of bytes free in the framebuffer to do
Z-buffering on a Voodoo2. When you're in 1024x768 resolution the memory
requirements for a double buffered display (essential for games) & Z
buffering are as follows:

Memory needed for display (16-bit colour depth):
(1024x768x16x2)/8 = 3,145,728 bytes (the 2 is for double buffering)
= 3MB

Memory needed for Z (16-bit Z on a V2):
(1024x768x16)/8 = 1,572,864 bytes
= 1.5MB

3+1.5 = 4.5 > 4MB therefore no Z buffer can be used.

Andrew

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From: Andrew Hodgson <ahodgson@nortelnetworks.com>
Subject: Re: Why V2 8MB can only do 800x600?
Date: 1999/10/14
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