source: OGRE/trunk/ogrenew/Docs/manual/manual_44.html @ 692

Revision 692, 2.9 KB checked in by mattausch, 19 years ago (diff)

adding ogre 1.2 and dependencies
Line 
1<HTML>
2<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
3<!-- Created on , 12 2006 by texi2html 1.64 -->
4<!--
5Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)
6            Karl Berry  <karl@freefriends.org>
7            Olaf Bachmann <obachman@mathematik.uni-kl.de>
8            and many others.
9Maintained by: Olaf Bachmann <obachman@mathematik.uni-kl.de>
10Send bugs and suggestions to <texi2html@mathematik.uni-kl.de>
11 
12-->
13<HEAD>
14<TITLE>OGRE Manual v1.2.0 ('Dagon'): Shadow Buffers</TITLE>
15
16<META NAME="description" CONTENT="OGRE Manual v1.2.0 ('Dagon'): Shadow Buffers">
17<META NAME="keywords" CONTENT="OGRE Manual v1.2.0 ('Dagon'): Shadow Buffers">
18<META NAME="resource-type" CONTENT="document">
19<META NAME="distribution" CONTENT="global">
20<META NAME="Generator" CONTENT="texi2html 1.64">
21<LINK TYPE="text/css" rel="stylesheet" href="../style.css"> 
22</HEAD>
23
24<BODY LANG="" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#800080" ALINK="#FF0000">
25
26<A NAME="SEC233"></A>
27<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
28<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="manual_43.html#SEC232"> &lt; </A>]</TD>
29<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="manual_41.html#SEC230"> Up </A>]</TD>
30<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="manual_45.html#SEC234"> &gt; </A>]</TD>
31<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="index.html#SEC_Top">Top</A>]</TD>
32<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="manual_toc.html#SEC_Contents">Contents</A>]</TD>
33<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
34<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="manual_abt.html#SEC_About"> ? </A>]</TD>
35</TR></TABLE>
36<HR SIZE=1>
37<H2> 5.3 Shadow Buffers </H2>
38<!--docid::SEC233::-->
39As discussed in the previous section, reading data back from a hardware buffer performs very badly. However, if you have a cast-iron need to read the contents of the vertex buffer, you should set the 'shadowBuffer' parameter of createVertexBuffer or createIndexBuffer to 'true'. This causes the hardware buffer to be backed with a system memory copy, which you can read from with no more penalty than reading ordinary memory. The catch is that when you write data into this buffer, it will first update the system memory copy, then it will update the hardware buffer, as separate copying process - therefore this technique has an additional overhead when writing data. Don't use it unless you really need it.
40<P>
41
42<A NAME="Locking buffers"></A>
43<HR SIZE=1>
44<BR> 
45<FONT SIZE="-1">
46This document was generated
47by <I>Steve Streeting</I> on <I>, 12 2006</I>
48using <A HREF="http://www.mathematik.uni-kl.de/~obachman/Texi2html
49"><I>texi2html</I></A>
50
51</BODY>
52</HTML>
Note: See TracBrowser for help on using the repository browser.