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21402f4aeb0Sopenharmony_ci                                        
21502f4aeb0Sopenharmony_ci</style>
21602f4aeb0Sopenharmony_ci    <title>eglMakeCurrent</title>
21702f4aeb0Sopenharmony_ci    <meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
21802f4aeb0Sopenharmony_ci  </head>
21902f4aeb0Sopenharmony_ci  <body>
22002f4aeb0Sopenharmony_ci    <div class="refentry">
22102f4aeb0Sopenharmony_ci      <a id="eglMakeCurrent"></a>
22202f4aeb0Sopenharmony_ci      <div class="titlepage"></div>
22302f4aeb0Sopenharmony_ci      <div xmlns="" class="refnamediv">
22402f4aeb0Sopenharmony_ci        <h1>eglMakeCurrent</h1>
22502f4aeb0Sopenharmony_ci        <p>
22602f4aeb0Sopenharmony_ci            attach an EGL rendering context to EGL surfaces
22702f4aeb0Sopenharmony_ci        </p>
22802f4aeb0Sopenharmony_ci      </div>
22902f4aeb0Sopenharmony_ci      <div class="refsynopsisdiv">
23002f4aeb0Sopenharmony_ci        <h2>C Specification</h2>
23102f4aeb0Sopenharmony_ci        <div class="funcsynopsis">
23202f4aeb0Sopenharmony_ci          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
23302f4aeb0Sopenharmony_ci            <tr valign="bottom">
23402f4aeb0Sopenharmony_ci              <td>
23502f4aeb0Sopenharmony_ci                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">EGLBoolean <strong class="fsfunc">eglMakeCurrent</strong>(</code>
23602f4aeb0Sopenharmony_ci                <td>EGLDisplay  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">display</var>, </td>
23702f4aeb0Sopenharmony_ci              </td>
23802f4aeb0Sopenharmony_ci            </tr>
23902f4aeb0Sopenharmony_ci            <tr valign="top">
24002f4aeb0Sopenharmony_ci              <td> </td>
24102f4aeb0Sopenharmony_ci              <td>EGLSurface  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">draw</var>, </td>
24202f4aeb0Sopenharmony_ci            </tr>
24302f4aeb0Sopenharmony_ci            <tr valign="top">
24402f4aeb0Sopenharmony_ci              <td> </td>
24502f4aeb0Sopenharmony_ci              <td>EGLSurface  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">read</var>, </td>
24602f4aeb0Sopenharmony_ci            </tr>
24702f4aeb0Sopenharmony_ci            <tr valign="top">
24802f4aeb0Sopenharmony_ci              <td> </td>
24902f4aeb0Sopenharmony_ci              <td>EGLContext  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">context</var><code>)</code></td>
25002f4aeb0Sopenharmony_ci            </tr>
25102f4aeb0Sopenharmony_ci          </table>
25202f4aeb0Sopenharmony_ci        </div>
25302f4aeb0Sopenharmony_ci      </div>
25402f4aeb0Sopenharmony_ci      <div class="refsect1">
25502f4aeb0Sopenharmony_ci        <a id="parameters"></a>
25602f4aeb0Sopenharmony_ci        <h2>Parameters</h2>
25702f4aeb0Sopenharmony_ci        <div class="variablelist">
25802f4aeb0Sopenharmony_ci          <dl class="variablelist">
25902f4aeb0Sopenharmony_ci            <dt>
26002f4aeb0Sopenharmony_ci              <span class="term">
26102f4aeb0Sopenharmony_ci                <em class="parameter">
26202f4aeb0Sopenharmony_ci                  <code>display</code>
26302f4aeb0Sopenharmony_ci                </em>
26402f4aeb0Sopenharmony_ci              </span>
26502f4aeb0Sopenharmony_ci            </dt>
26602f4aeb0Sopenharmony_ci            <dd>
26702f4aeb0Sopenharmony_ci              <p>Specifies the <acronym class="acronym">EGL</acronym> display connection.</p>
26802f4aeb0Sopenharmony_ci            </dd>
26902f4aeb0Sopenharmony_ci            <dt>
27002f4aeb0Sopenharmony_ci              <span class="term">
27102f4aeb0Sopenharmony_ci                <em class="parameter">
27202f4aeb0Sopenharmony_ci                  <code>draw</code>
27302f4aeb0Sopenharmony_ci                </em>
27402f4aeb0Sopenharmony_ci              </span>
27502f4aeb0Sopenharmony_ci            </dt>
27602f4aeb0Sopenharmony_ci            <dd>
27702f4aeb0Sopenharmony_ci              <p>Specifies the <acronym class="acronym">EGL</acronym> draw surface.</p>
27802f4aeb0Sopenharmony_ci            </dd>
27902f4aeb0Sopenharmony_ci            <dt>
28002f4aeb0Sopenharmony_ci              <span class="term">
28102f4aeb0Sopenharmony_ci                <em class="parameter">
28202f4aeb0Sopenharmony_ci                  <code>read</code>
28302f4aeb0Sopenharmony_ci                </em>
28402f4aeb0Sopenharmony_ci              </span>
28502f4aeb0Sopenharmony_ci            </dt>
28602f4aeb0Sopenharmony_ci            <dd>
28702f4aeb0Sopenharmony_ci              <p>Specifies the <acronym class="acronym">EGL</acronym> read surface.</p>
28802f4aeb0Sopenharmony_ci            </dd>
28902f4aeb0Sopenharmony_ci            <dt>
29002f4aeb0Sopenharmony_ci              <span class="term">
29102f4aeb0Sopenharmony_ci                <em class="parameter">
29202f4aeb0Sopenharmony_ci                  <code>context</code>
29302f4aeb0Sopenharmony_ci                </em>
29402f4aeb0Sopenharmony_ci              </span>
29502f4aeb0Sopenharmony_ci            </dt>
29602f4aeb0Sopenharmony_ci            <dd>
29702f4aeb0Sopenharmony_ci              <p>Specifies the <acronym class="acronym">EGL</acronym> rendering context
29802f4aeb0Sopenharmony_ci                        to be attached to the surfaces.
29902f4aeb0Sopenharmony_ci                    </p>
30002f4aeb0Sopenharmony_ci            </dd>
30102f4aeb0Sopenharmony_ci          </dl>
30202f4aeb0Sopenharmony_ci        </div>
30302f4aeb0Sopenharmony_ci      </div>
30402f4aeb0Sopenharmony_ci      <div class="refsect1">
30502f4aeb0Sopenharmony_ci        <a id="description"></a>
30602f4aeb0Sopenharmony_ci        <h2>Description</h2>
30702f4aeb0Sopenharmony_ci        <p>
30802f4aeb0Sopenharmony_ci            <code class="function">eglMakeCurrent</code> binds <em class="parameter"><code>context</code></em>
30902f4aeb0Sopenharmony_ci            to the current rendering thread and to the <em class="parameter"><code>draw</code></em>
31002f4aeb0Sopenharmony_ci            and <em class="parameter"><code>read</code></em> surfaces. <em class="parameter"><code>draw</code></em>
31102f4aeb0Sopenharmony_ci            is used for all GL operations except for any pixel data read back
31202f4aeb0Sopenharmony_ci            (<a class="citerefentry" href="glReadPixels.html"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a>,
31302f4aeb0Sopenharmony_ci            <a class="citerefentry" href="glCopyTexImage2D.html"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>, and
31402f4aeb0Sopenharmony_ci            <a class="citerefentry" href="glCopyTexSubImage2D.html"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>),
31502f4aeb0Sopenharmony_ci            which is taken from the frame buffer values of
31602f4aeb0Sopenharmony_ci            <em class="parameter"><code>read</code></em>.
31702f4aeb0Sopenharmony_ci        </p>
31802f4aeb0Sopenharmony_ci        <p>
31902f4aeb0Sopenharmony_ci            If the calling thread has already a current rendering context, that
32002f4aeb0Sopenharmony_ci            context is flushed and marked as no longer current.
32102f4aeb0Sopenharmony_ci        </p>
32202f4aeb0Sopenharmony_ci        <p>
32302f4aeb0Sopenharmony_ci            The first time that <em class="parameter"><code>context</code></em> is made current,
32402f4aeb0Sopenharmony_ci            the viewport and scissor dimensions are set to the size of the
32502f4aeb0Sopenharmony_ci            <em class="parameter"><code>draw</code></em> surface. The viewport and
32602f4aeb0Sopenharmony_ci            scissor are not modified when <em class="parameter"><code>context</code></em> is
32702f4aeb0Sopenharmony_ci            subsequently made current.
32802f4aeb0Sopenharmony_ci        </p>
32902f4aeb0Sopenharmony_ci        <p>
33002f4aeb0Sopenharmony_ci            To release the current context without assigning a new one, call
33102f4aeb0Sopenharmony_ci            <code class="function">eglMakeCurrent</code> with <em class="parameter"><code>draw</code></em>
33202f4aeb0Sopenharmony_ci            and <em class="parameter"><code>read</code></em> set to
33302f4aeb0Sopenharmony_ci            <code class="constant">EGL_NO_SURFACE</code> and <em class="parameter"><code>context</code></em>
33402f4aeb0Sopenharmony_ci            set to <code class="constant">EGL_NO_CONTEXT</code>.
33502f4aeb0Sopenharmony_ci        </p>
33602f4aeb0Sopenharmony_ci        <p>
33702f4aeb0Sopenharmony_ci            Use
33802f4aeb0Sopenharmony_ci            <a class="citerefentry" href="eglGetCurrentContext.html"><span class="citerefentry"><span class="refentrytitle">eglGetCurrentContext</span></span></a>,
33902f4aeb0Sopenharmony_ci            <a class="citerefentry" href="eglGetCurrentDisplay.html"><span class="citerefentry"><span class="refentrytitle">eglGetCurrentDisplay</span></span></a>, and
34002f4aeb0Sopenharmony_ci            <a class="citerefentry" href="eglGetCurrentSurface.html"><span class="citerefentry"><span class="refentrytitle">eglGetCurrentSurface</span></span></a>
34102f4aeb0Sopenharmony_ci            to query the current rendering context and associated display connection and surfaces.
34202f4aeb0Sopenharmony_ci        </p>
34302f4aeb0Sopenharmony_ci      </div>
34402f4aeb0Sopenharmony_ci      <div class="refsect1">
34502f4aeb0Sopenharmony_ci        <a id="errors"></a>
34602f4aeb0Sopenharmony_ci        <h2>Errors</h2>
34702f4aeb0Sopenharmony_ci        <p>
34802f4aeb0Sopenharmony_ci            <code class="constant">EGL_FALSE</code> is returned on failure,
34902f4aeb0Sopenharmony_ci            <code class="constant">EGL_TRUE</code> otherwise. If <code class="constant">EGL_FALSE</code>
35002f4aeb0Sopenharmony_ci            is returned, the previously current rendering context and
35102f4aeb0Sopenharmony_ci            surfaces (if any) remain unchanged.
35202f4aeb0Sopenharmony_ci        </p>
35302f4aeb0Sopenharmony_ci        <p>
35402f4aeb0Sopenharmony_ci            <code class="constant">EGL_BAD_DISPLAY</code> is generated if
35502f4aeb0Sopenharmony_ci            <em class="parameter"><code>display</code></em> is not an EGL display connection.
35602f4aeb0Sopenharmony_ci        </p>
35702f4aeb0Sopenharmony_ci        <p>
35802f4aeb0Sopenharmony_ci            <code class="constant">EGL_NOT_INITIALIZED</code> is generated if
35902f4aeb0Sopenharmony_ci            <em class="parameter"><code>display</code></em> has not been initialized.
36002f4aeb0Sopenharmony_ci        </p>
36102f4aeb0Sopenharmony_ci        <p>
36202f4aeb0Sopenharmony_ci            <code class="constant">EGL_BAD_SURFACE</code> is generated if
36302f4aeb0Sopenharmony_ci            <em class="parameter"><code>draw</code></em> or <em class="parameter"><code>read</code></em> is not an
36402f4aeb0Sopenharmony_ci            EGL surface.
36502f4aeb0Sopenharmony_ci        </p>
36602f4aeb0Sopenharmony_ci        <p>
36702f4aeb0Sopenharmony_ci            <code class="constant">EGL_BAD_CONTEXT</code> is generated if
36802f4aeb0Sopenharmony_ci            <em class="parameter"><code>context</code></em> is not an EGL rendering context.
36902f4aeb0Sopenharmony_ci        </p>
37002f4aeb0Sopenharmony_ci        <p>
37102f4aeb0Sopenharmony_ci            <code class="constant">EGL_BAD_MATCH</code> is generated if
37202f4aeb0Sopenharmony_ci            <em class="parameter"><code>draw</code></em> or
37302f4aeb0Sopenharmony_ci            <em class="parameter"><code>read</code></em>
37402f4aeb0Sopenharmony_ci            are not compatible with
37502f4aeb0Sopenharmony_ci            <em class="parameter"><code>context</code></em>, or if
37602f4aeb0Sopenharmony_ci            <em class="parameter"><code>context</code></em> is set to
37702f4aeb0Sopenharmony_ci            <code class="constant">EGL_NO_CONTEXT</code> and
37802f4aeb0Sopenharmony_ci            <em class="parameter"><code>draw</code></em> or
37902f4aeb0Sopenharmony_ci            <em class="parameter"><code>read</code></em>
38002f4aeb0Sopenharmony_ci            are not set to
38102f4aeb0Sopenharmony_ci            <code class="constant">EGL_NO_SURFACE</code>, or if
38202f4aeb0Sopenharmony_ci            <em class="parameter"><code>draw</code></em> or
38302f4aeb0Sopenharmony_ci            <em class="parameter"><code>read</code></em> are set to
38402f4aeb0Sopenharmony_ci            <code class="constant">EGL_NO_SURFACE</code> and
38502f4aeb0Sopenharmony_ci            <em class="parameter"><code>context</code></em> is not set to
38602f4aeb0Sopenharmony_ci            <code class="constant">EGL_NO_CONTEXT</code>.
38702f4aeb0Sopenharmony_ci        </p>
38802f4aeb0Sopenharmony_ci        <p>
38902f4aeb0Sopenharmony_ci            <code class="constant">EGL_BAD_ACCESS</code> is generated if
39002f4aeb0Sopenharmony_ci            <em class="parameter"><code>context</code></em>
39102f4aeb0Sopenharmony_ci            is current to some other thread.
39202f4aeb0Sopenharmony_ci        </p>
39302f4aeb0Sopenharmony_ci        <p>
39402f4aeb0Sopenharmony_ci            <code class="constant">EGL_BAD_NATIVE_PIXMAP</code> may be generated if
39502f4aeb0Sopenharmony_ci            a native pixmap underlying either
39602f4aeb0Sopenharmony_ci            <em class="parameter"><code>draw</code></em> or
39702f4aeb0Sopenharmony_ci            <em class="parameter"><code>read</code></em>
39802f4aeb0Sopenharmony_ci            is no longer valid.
39902f4aeb0Sopenharmony_ci        </p>
40002f4aeb0Sopenharmony_ci        <p>
40102f4aeb0Sopenharmony_ci            <code class="constant">EGL_BAD_NATIVE_WINDOW</code> may be generated if
40202f4aeb0Sopenharmony_ci            a native window underlying either
40302f4aeb0Sopenharmony_ci            <em class="parameter"><code>draw</code></em> or
40402f4aeb0Sopenharmony_ci            <em class="parameter"><code>read</code></em>
40502f4aeb0Sopenharmony_ci            is no longer valid.
40602f4aeb0Sopenharmony_ci        </p>
40702f4aeb0Sopenharmony_ci        <p>
40802f4aeb0Sopenharmony_ci            <code class="constant">EGL_BAD_CURRENT_SURFACE</code> is generated if
40902f4aeb0Sopenharmony_ci            the previous context has unflushed commands and the previous surface
41002f4aeb0Sopenharmony_ci            is no longer valid.
41102f4aeb0Sopenharmony_ci        </p>
41202f4aeb0Sopenharmony_ci        <p>
41302f4aeb0Sopenharmony_ci            <code class="constant">EGL_BAD_ALLOC</code> may be generated if
41402f4aeb0Sopenharmony_ci            allocation of ancillary buffers for <em class="parameter"><code>draw</code></em> or
41502f4aeb0Sopenharmony_ci            <em class="parameter"><code>read</code></em> were delayed until
41602f4aeb0Sopenharmony_ci            <code class="function">eglMakeCurrent</code> is called, and there are not
41702f4aeb0Sopenharmony_ci            enough resources to allocate them.
41802f4aeb0Sopenharmony_ci        </p>
41902f4aeb0Sopenharmony_ci        <p>
42002f4aeb0Sopenharmony_ci            <code class="constant">EGL_CONTEXT_LOST</code> is generated if a power management
42102f4aeb0Sopenharmony_ci            event has occurred. The application must destroy all contexts and
42202f4aeb0Sopenharmony_ci            reinitialise OpenGL ES state and objects to continue rendering.
42302f4aeb0Sopenharmony_ci        </p>
42402f4aeb0Sopenharmony_ci      </div>
42502f4aeb0Sopenharmony_ci      <div class="refsect1">
42602f4aeb0Sopenharmony_ci        <a id="seealso"></a>
42702f4aeb0Sopenharmony_ci        <h2>See Also</h2>
42802f4aeb0Sopenharmony_ci        <p>
42902f4aeb0Sopenharmony_ci            <a class="citerefentry" href="glReadPixels.html"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a>,
43002f4aeb0Sopenharmony_ci            <a class="citerefentry" href="glCopyTexImage2D.html"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>,
43102f4aeb0Sopenharmony_ci            <a class="citerefentry" href="glCopyTexSubImage2D.html"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>,
43202f4aeb0Sopenharmony_ci            <a class="citerefentry" href="eglCreateContext.html"><span class="citerefentry"><span class="refentrytitle">eglCreateContext</span></span></a>,
43302f4aeb0Sopenharmony_ci            <a class="citerefentry" href="eglCreatePbufferSurface.html"><span class="citerefentry"><span class="refentrytitle">eglCreatePbufferSurface</span></span></a>,
43402f4aeb0Sopenharmony_ci            <a class="citerefentry" href="eglCreatePixmapSurface.html"><span class="citerefentry"><span class="refentrytitle">eglCreatePixmapSurface</span></span></a>,
43502f4aeb0Sopenharmony_ci            <a class="citerefentry" href="eglCreateWindowSurface.html"><span class="citerefentry"><span class="refentrytitle">eglCreateWindowSurface</span></span></a>,
43602f4aeb0Sopenharmony_ci            <a class="citerefentry" href="eglGetCurrentContext.html"><span class="citerefentry"><span class="refentrytitle">eglGetCurrentContext</span></span></a>,
43702f4aeb0Sopenharmony_ci            <a class="citerefentry" href="eglGetCurrentDisplay.html"><span class="citerefentry"><span class="refentrytitle">eglGetCurrentDisplay</span></span></a>,
43802f4aeb0Sopenharmony_ci            <a class="citerefentry" href="eglGetCurrentSurface.html"><span class="citerefentry"><span class="refentrytitle">eglGetCurrentSurface</span></span></a>,
43902f4aeb0Sopenharmony_ci            <a class="citerefentry" href="eglGetDisplay.html"><span class="citerefentry"><span class="refentrytitle">eglGetDisplay</span></span></a>,
44002f4aeb0Sopenharmony_ci            <a class="citerefentry" href="eglInitialize.html"><span class="citerefentry"><span class="refentrytitle">eglInitialize</span></span></a>
44102f4aeb0Sopenharmony_ci        </p>
44202f4aeb0Sopenharmony_ci      </div>
44302f4aeb0Sopenharmony_ci      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>
44402f4aeb0Sopenharmony_ciCopyright © 2003-2014 The Khronos Group Inc.
44502f4aeb0Sopenharmony_ciPermission is hereby granted, free of charge, to any person obtaining a
44602f4aeb0Sopenharmony_cicopy of this software and/or associated documentation files (the
44702f4aeb0Sopenharmony_ci"Materials"), to deal in the Materials without restriction, including
44802f4aeb0Sopenharmony_ciwithout limitation the rights to use, copy, modify, merge, publish,
44902f4aeb0Sopenharmony_cidistribute, sublicense, and/or sell copies of the Materials, and to
45002f4aeb0Sopenharmony_cipermit persons to whom the Materials are furnished to do so, subject to
45102f4aeb0Sopenharmony_cithe condition that this copyright notice and permission notice shall be included
45202f4aeb0Sopenharmony_ciin all copies or substantial portions of the Materials.
45302f4aeb0Sopenharmony_ci</div>
45402f4aeb0Sopenharmony_ci    </div>
45502f4aeb0Sopenharmony_ci  </body>
45602f4aeb0Sopenharmony_ci</html>
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