1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
2<HTML>
3<HEAD>
4<META http-equiv="Content-Type" content="text/html; charset=windows-1252">
5<META name="GENERATOR" content="Microsoft FrontPage 5.0">
6<META http-equiv="Content-Style-Type" content="text/css">
7<LINK rel="stylesheet" type="text/css" href="../../CSS/revolution.css">
8<TITLE>GXSetZScaleOffset</TITLE>
9</HEAD>
10<BODY>
11<H1 align="left">GXSetZScaleOffset</H1>
12
13<H2>Syntax</H2>
14<dl><dd><pre class="construction">
15#include &lt;revolution/gx.h&gt;
16
17void GXSetZScaleOffset( f32 scale, f32 offset );
18</pre></dd></dl>
19
20<H2>Arguments</H2>
21<TABLE class="arguments" border="1" >
22  <TBODY>
23    <TR>
24<TH><STRONG><EM><CODE>scale</CODE></EM></STRONG></TH>
25<TD>specifies scale value for Z adjustment</TD>
26    </TR>
27    <TR>
28<TH>offset</TH>
29<TD>specifies offset value for Z adjustment</TD>
30    </TR>
31  </TBODY>
32</TABLE>
33
34<H2>Return Values</H2>
35<P>None.</P>
36
37<H2>Description</H2>
38<P>This function sets scale and offset values that are applied to the depth value of each pixel before it is written into the Z buffer. The Z modification function is:</P>
39<P><SPAN class="argument">Zs' = Zs * scale + offset;</SPAN></P>
40<P>where <SPAN class="argument">Zs</SPAN> is the result value in screen-space after model-view, projection and viewport transformations.<BR>This function internally adjusts the viewport setting to realize these scaling/offsetting. With this function, you can easily modify depth priorities for each primitive without changing the entire viewport.</P>
41<P>The viewport depth parameters are normalized coordinates from 0.0f to 1.0f, thus the offset value should be defined in the same manner.</P>
42
43<H2>See Also</H2>
44<P class="reference">
45<A href="GXSetViewport.html">GXSetViewport</A>
46</P>
47
48<H2>Revision History</H2>
49<P>
502006/03/01 Initial version.<br>
51</P>
52
53<hr><p>CONFIDENTIAL</p></body>
54</HTML>