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7<title>nngxSetVSyncCallback</title>
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10<h1><CODE>nngxSetVSyncCallback</CODE> Function</h1>
11<h2>Syntax</h2>
12    <div class="section">
13      <pre class="definition">
14NNGX_APICALL void NNGX_APIENTRY nngxSetVSyncCallback(
15     GLenum display,
16     void(*)(GLenum) func
17);
18</pre>
19    </div>
20<h2>Arguments</h2>
21    <div class="section">
22      <table class="arguments">
23        <thead>
24          <tr>
25            <td width="15" />
26<th>Name</th>
27<td>Description</td>
28          </tr>
29        </thead>
30        <tr>
31<td>in</td>
32<th>display</th>
33<td>Screen to set the callback for</td>
34        </tr>
35        <tr>
36<td>in</td>
37<th>func</th>
38<td>Callback function</td>
39        </tr> </table>
40    </div>
41<h2>Return Values</h2>
42<div class="section">No values are returned. </div>
43<h2>Description</h2>
44    <div class="section">
45<p>Registers the V-Sync callback.</p><P>
46To receive a callback for a V-Sync on the upper screen, specify <SPAN class="argument">display</SPAN> as <CODE>NN_GX_DISPLAY0</CODE>. For the lower screen, specify <CODE>NN_GX_DISPLAY1</CODE>, and for both screens specify <CODE>NN_GX_DISPLAY_BOTH</CODE>.
47            </P><P>
48Set <SPAN class="argument">func</SPAN> to the callback function. The callback function is given <CODE>NN_GX_DISPLAY0</CODE> as an argument for screen 0 and <CODE>NN_GX_DISPLAY1</CODE> for screen 1. The callback is not invoked if <SPAN class="argument">func</SPAN> is set to 0.
49            </P><P>
50This function generates the following errors.
51<TABLE><TR><TH>GL_ERROR_801B_DMP</TH><TD>If any other value is specified for the <SPAN class="argument">display</SPAN> argument.</TD></TR></TABLE></P></div>
52<h2>Revision History</h2>
53    <div class="section">
54      <dl class="history">
55        <dt>2010/08/18</dt>
56<dd>Reworked for consistent terminology.
57        </dd>
58        <dt>2010/03/12</dt>
59<dd>Added extended error code(s).<br />
60        </dd>
61        <dt>2010/01/07</dt>
62<dd>Initial version.<br />
63        </dd>
64      </dl>
65    </div>
66  <hr><p>CONFIDENTIAL</p></body>
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