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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title xmlns:xlink="http://www.w3.org/1999/xlink">eglBindTexImage - EGL Reference Pages</title>
<link rel="stylesheet" type="text/css" href="khronos-man.css"/>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"/>
</head>
<body>
<header/>
<div class="refentry" id="eglBindTexImage">
<div class="titlepage"/>
<div class="refnamediv">
<h2>Name</h2>
<p>eglBindTexImage —
Defines a two-dimensional texture image
</p>
</div>
<div class="refsynopsisdiv">
<h2>C Specification</h2>
<div class="funcsynopsis">
<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
<tr>
<td>
<code class="funcdef">EGLBoolean <strong class="fsfunc">eglBindTexImage</strong>(</code>
</td>
<td>EGLDisplay <var class="pdparam">display</var>, </td>
</tr>
<tr>
<td> </td>
<td>EGLSurface <var class="pdparam">surface</var>, </td>
</tr>
<tr>
<td> </td>
<td>EGLint <var class="pdparam">buffer</var><code>)</code>;</td>
</tr>
</table>
<div class="funcprototype-spacer"> </div>
</div>
</div>
<div class="refsect1" id="parameters">
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<em class="parameter">
<code>display</code>
</em>
</span>
</dt>
<dd>
<p>Specifies the EGL display connection.</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>surface</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the EGL surface.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>buffer</code>
</em>
</span>
</dt>
<dd>
<p>Specifies the texture image data.</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>
The texture image consists of the image data in <em class="parameter"><code>buffer</code></em> for the specified surface, and need not be copied.
</p>
<p>
The texture target, the texture format and the size of the texture components are derived from
attributes of the specified surface, which must be a pbuffer supporting one of the
<code class="constant">EGL_BIND_TO_TEXTURE_RGB</code> or <code class="constant">EGL_BIND_TO_TEXTURE_RGBA</code> attributes.
</p>
<p>
The pbuffer attribute <code class="constant">EGL_TEXTURE_FORMAT</code> determines the base internal format
of the texture.
</p>
<p>
The texture target is derived from the <code class="constant">EGL_TEXTURE_TARGET</code> attribute of surface.
If the attribute value is <code class="constant">EGL_TEXTURE_2D</code>, then <em class="parameter"><code>buffer</code></em> defines a texture for
the two-dimensional texture object which is bound to the current context (hereafter
referred to as the current texture object).
</p>
<p>
If <em class="parameter"><code>display</code></em> and <em class="parameter"><code>surface</code></em> are the display and surface for the calling thread's current
context, <code class="function">eglBindTexImage</code> performs an implicit <a class="citerefentry" href="glFlush.xhtml"><span class="citerefentry"><span class="refentrytitle">glFlush</span></span></a>.
For other surfaces, <code class="function">eglBindTexImage</code> waits for all effects from previously issued OpenGL ES commands
drawing to the surface to complete before defining the texture image, as
though <a class="citerefentry" href="glFinish.xhtml"><span class="citerefentry"><span class="refentrytitle">glFinish</span></span></a> were called on the last context to which that surface were bound.
</p>
<p>
After <code class="function">eglBindTexImage</code> is called, the specified surface is no longer available
for reading or writing. Any read operation, such as <a class="citerefentry" href="glReadPixels.xhtml"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a> or
<a class="citerefentry" href="eglCopyBuffers.xhtml"><span class="citerefentry"><span class="refentrytitle">eglCopyBuffers</span></span></a>, which reads values from any of the surface's color buffers or ancillary
buffers will produce indeterminate results. In addition, draw operations that are
done to the surface before its color buffer is released from the texture produce indeterminate
results. Specifically, if the surface is current to a context and thread
then rendering commands will be processed and the context state will be updated,
but the surface may or may not be written.
</p>
<p>
Texture mipmap levels are automatically generated when all of the following
conditions are met while calling <code class="function">eglBindTexImage</code>:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>
The <code class="constant">EGL_MIPMAP_TEXTURE</code> attribute of the pbuffer being bound is
<code class="constant">EGL_TRUE</code>.
</p>
</li>
<li class="listitem">
<p>
The OpenGL ES texture parameter <code class="constant">GL_GENERATE_MIPMAP</code> is <code class="constant">GL_TRUE</code> for
the currently bound texture.
</p>
</li>
<li class="listitem">
<p>
The value of the <code class="constant">EGL_MIPMAP_LEVEL</code> attribute of the pbuffer being bound is
equal to the value of the texture parameter <code class="constant">GL_TEXTURE_BASE_LEVEL</code>.
In this case, additional mipmap levels are generated as described in section 3.8
of the OpenGL ES 1.1 Specification.
</p>
</li>
</ul>
</div>
<p>
In this case, additional mipmap levels are generated as described in section 3.8
of the OpenGL ES 1.1 Specification.
</p>
</div>
<div class="refsect1" id="notes">
<h2>Notes</h2>
<p>
<a class="citerefentry" href="eglSwapBuffers.xhtml"><span class="citerefentry"><span class="refentrytitle">eglSwapBuffers</span></span></a> has no effect if it is
called on a bound surface.
</p>
<p>
Any existing images associated with the different mipmap levels of the texture object
are freed (it is as if <a class="citerefentry" href="glTexImage.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexImage</span></span></a>
was called with an image of zero width).
</p>
<p>
The color buffer is bound to a texture object. If the texture object is
shared between contexts, then the color buffer is also shared. If a texture object is
deleted before <a class="citerefentry" href="eglReleaseTexImage.xhtml"><span class="citerefentry"><span class="refentrytitle">eglReleaseTexImage</span></span></a> is called, then the color buffer is released and
the surface is made available for reading and writing.
</p>
<p>
It is not an error to call <a class="citerefentry" href="glTexImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a> or
<a class="citerefentry" href="glCopyTexImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a> to replace an
image of a texture object that has a color buffer bound to it. However, these calls
will cause the color buffer to be released back to the surface and new memory will
be allocated for the texture. Note that the color buffer is released even if the image
that is being defined is a mipmap level that was not defined by the color buffer.
</p>
<p>
<code class="function">eglBindTexImage</code> is ignored if there is no current rendering context.
</p>
</div>
<div class="refsect1" id="errors">
<h2>Errors</h2>
<p>
<code class="constant">EGL_BAD_ACCESS</code> is generated if
<em class="parameter"><code>buffer</code></em> is already bound to a texture.
</p>
<p>
<code class="constant">EGL_BAD_MATCH</code> is generated if the
surface attribute <code class="constant">EGL_TEXTURE_FORMAT</code> is
set to <code class="constant">EGL_NO_TEXTURE</code>.
</p>
<p>
<code class="constant">EGL_BAD_MATCH</code> is generated if
<em class="parameter"><code>buffer</code></em> is not a valid buffer
(currently only <code class="constant">EGL_BACK_BUFFER</code> may be
specified).
</p>
<p>
<code class="constant">EGL_BAD_SURFACE</code> is generated if
<em class="parameter"><code>surface</code></em> is not an EGL surface, or is
not a pbuffer surface supporting texture binding.
</p>
</div>
<div class="refsect1" id="seealso">
<h2>See Also</h2>
<p>
<a class="citerefentry" href="eglReleaseTexImage.xhtml"><span class="citerefentry"><span class="refentrytitle">eglReleaseTexImage</span></span></a>
</p>
</div>
<p>
</p>
<div class="refsect3" id="copyright">
<img src="KhronosLogo.jpg"/>
<p>
Copyright © 2003-2014 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.
</p>
</div>
<p>
</p>
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