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7<title>nngxCheckVSync</title>
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10<h1><CODE>nngxCheckVSync</CODE> Function</h1>
11<h2>Syntax</h2>
12    <div class="section">
13      <pre class="definition">
14NNGX_APICALL GLint NNGX_APIENTRY nngxCheckVSync(
15     GLenum display
16);
17</pre>
18    </div>
19<h2>Arguments</h2>
20    <div class="section">
21      <table class="arguments">
22        <thead>
23          <tr>
24            <td width="15" />
25<th>Name</th>
26<td>Description</td>
27          </tr>
28        </thead>
29        <tr>
30<td>in</td>
31<th>display</th>
32<td>Screen for which to get a counter</td>
33        </tr> </table>
34    </div>
35<h2>Return Values</h2>
36<div class="section">VSync counter. </div>
37<h2>Description</h2>
38    <div class="section">
39<p>Gets the V-Sync counter.</p><P>
40The V-Sync counter is incremented for each V-Sync interrupt.
41            </P><P>
42For the V-Sync count 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>. The counter obtained by specifying <CODE>NN_GX_DISPLAY_BOTH</CODE> is incremented when both screen 0 and screen 1 have been updated.
43            </P><P>
44The internal counter for the return value will reset to 0 if the implementation-dependent maximum count is exceeded. This maximum value may be changed without notice in the future when the driver is updated. The maximum value is currently set to 0x7FFFFFFE.
45            </P><P>
46This function generates the following errors.
47<TABLE><TR><TH>GL_ERROR_8019_DMP</TH><TD>A value other than the ones listed above was specified for the display argument. The return value in this case is undefined.</TD></TR></TABLE></P></div>
48<h2>Revision History</h2>
49    <div class="section">
50      <dl class="history">
51        <dt>2010/08/18</dt>
52<dd>Reworked for consistent terminology.
53        </dd>
54        <dt>2010/03/12</dt>
55<dd>Added extended error code(s).<br />
56        </dd>
57        <dt>2010/01/07</dt>
58<dd>Initial version.<br />
59        </dd>
60      </dl>
61    </div>
62  <hr><p>CONFIDENTIAL</p></body>
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