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13
14<h1 align="left">GXSetProjection</h1>
15
16<h2>Syntax</h2>
17<dl><dd><pre class="construction">
18#include &lt;revolution/gx.h&gt;
19
20void GXSetProjection(f32 mtx[4][4], <a href="../Enumerated_Types/GXProjectionType.html">GXProjectionType</a> type);
21</pre></dd></dl>
22
23<h2>Arguments</h2>
24<TABLE class="arguments" border="1" >
25  <tr>
26<TH>mtx</TH>
27<TD>Specifies a pointer to the matrix data.</TD>
28  </tr>
29  <tr>
30<TH>type</TH>
31<TD>Specifies the projection type. Accepted values are: <CODE>GX_PERSPECTIVE</CODE>, <CODE>GX_ORTHOGRAPHIC</CODE>.</TD>
32  </tr>
33</TABLE>
34
35<h2>Return Values</h2>
36<p>None.</p>
37
38<H2>Description</H2>
39<P>This function sets the projection matrix.&nbsp;Only two types of projection matrices are supported.</P>
40<P>Perspective Matrix Format:</P>
41<TABLE border="0" width="50%" style="border-left: 1px solid; border-right: 1px solid; border-top: medium none; border-bottom: medium none">
42  <TBODY>
43    <TR>
44      <TD width="25%" align="center">p0</TD>
45      <TD width="25%" align="center">0</TD>
46      <TD width="25%" align="center">p1</TD>
47      <TD width="25%" align="center">0</TD>
48    </TR>
49    <TR>
50      <TD width="25%" align="center">0</TD>
51      <TD width="25%" align="center">p2</TD>
52      <TD width="25%" align="center">p3</TD>
53      <TD width="25%" align="center">0</TD>
54    </TR>
55    <TR>
56      <TD width="25%" align="center">0</TD>
57      <TD width="25%" align="center">0</TD>
58      <TD width="25%" align="center">p4</TD>
59      <TD width="25%" align="center">p5</TD>
60    </TR>
61    <TR>
62      <TD width="25%" align="center">0</TD>
63      <TD width="25%" align="center">0</TD>
64      <TD width="25%" align="center">-1</TD>
65      <TD width="25%" align="center">0</TD>
66    </TR>
67  </TBODY>
68</TABLE>
69<P>Orthographic Matrix Format:</P>
70<TABLE border="0" width="50%" style="border-left: 1px solid; border-right: 1px solid; border-top: medium none; border-bottom: medium none">
71  <TBODY>
72    <TR>
73      <TD width="25%" align="center">p0</TD>
74      <TD width="25%" align="center">0</TD>
75      <TD width="25%" align="center">0</TD>
76      <TD width="25%" align="center">p1</TD>
77    </TR>
78    <TR>
79      <TD width="25%" align="center">0</TD>
80      <TD width="25%" align="center">p2</TD>
81      <TD width="25%" align="center">0</TD>
82      <TD width="25%" align="center">p3</TD>
83    </TR>
84    <TR>
85      <TD width="25%" align="center">0</TD>
86      <TD width="25%" align="center">0</TD>
87      <TD width="25%" align="center">p4</TD>
88      <TD width="25%" align="center">p5</TD>
89    </TR>
90    <TR>
91      <TD width="25%" align="center">0</TD>
92      <TD width="25%" align="center">0</TD>
93      <TD width="25%" align="center">0</TD>
94      <TD width="25%" align="center">1</TD>
95    </TR>
96  </TBODY>
97</TABLE>
98<P>Only the parameters p0-p5 are actually loaded into the hardware projection matrix. All the other values are determined by the <SPAN class="argument">type</SPAN>.</P>
99<P>The matrix data is copied from main memory through the CPU cache into the graphics FIFO. Matrices loaded using this function are therefore always coherent with the CPU cache.</P>
100
101<h2>See Also</h2>
102<p class="reference">
103<a href="../../mtx/Projection/MTXFrustum.html">MTXFrustum</a>,
104<a href="../../mtx/Projection/MTXPerspective.html">MTXPerspective</a>
105</p>
106
107<H2>Revision History</H2>
108<P>
1092006/03/01 Initial version.<br>
110</P>
111
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