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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
<refentry xml:base="" id="eglSurfaceAttrib">
<refentryinfo>
<copyright>
<year>2003-2014</year>
<holder>The Khronos Group Inc.</holder>
</copyright>
</refentryinfo>
<refmeta>
<refentrytitle>eglSurfaceAttrib</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>eglSurfaceAttrib</refname>
<refpurpose>
set an <acronym>EGL</acronym> surface attribute
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>EGLBoolean <function>eglSurfaceAttrib</function></funcdef>
<paramdef>EGLDisplay <parameter>display</parameter></paramdef>
<paramdef>EGLSurface <parameter>surface</parameter></paramdef>
<paramdef>EGLint <parameter>attribute</parameter></paramdef>
<paramdef>EGLint <parameter>value</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>display</parameter></term>
<listitem>
<para>
Specifies the EGL display connection.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>surface</parameter></term>
<listitem>
<para>
Specifies the EGL surface.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>attribute</parameter></term>
<listitem>
<para>
Specifies the EGL surface attribute to set.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>value</parameter></term>
<listitem>
<para>
Specifies the attributes required value.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="description"><title>Description</title>
<para>
<function>eglSurfaceAttrib</function> sets the value of
<parameter>attribute</parameter> for
<parameter>surface</parameter> to
<parameter>value</parameter>.
<parameter>attribute</parameter> can be one of the
following:
</para>
<variablelist>
<varlistentry>
<term><constant>EGL_MIPMAP_LEVEL</constant></term>
<listitem><para>
For mipmap textures, the
<constant>EGL_MIPMAP_LEVEL</constant> attribute
indicates which level of the mipmap should be
rendered. If the value of this attribute is outside
the range of supported mipmap levels, the closest
valid mipmap level is selected for rendering. The
default value is <constant>0</constant>.
</para></listitem>
</varlistentry>
<varlistentry>
<term><constant>EGL_MULTISAMPLE_RESOLVE</constant></term>
<listitem>
<para>
Specifies the filter to use when resolving the
multisample buffer (this may occur when swapping or
copying the surface, or when changing the client API
context bound to the surface). A
<parameter>value</parameter> of
<constant>EGL_MULTISAMPLE_RESOLVE_DEFAULT</constant>
chooses the default implementation-defined filtering
method, while
<constant>EGL_MULTISAMPLE_RESOLVE_BOX</constant>
chooses a one-pixel wide box filter placing equal
weighting on all multisample values.
</para>
<para>
The initial value of
<constant>EGL_MULTISAMPLE_RESOLVE</constant> is
<constant>EGL_MULTISAMPLE_RESOLVE_DEFAULT</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>EGL_SWAP_BEHAVIOR</constant></term>
<listitem>
<para>
Specifies the effect on the color buffer of posting
a surface with
<citerefentry><refentrytitle>eglSwapBuffers</refentrytitle></citerefentry>.
A <parameter>value</parameter> of
<constant>EGL_BUFFER_PRESERVED</constant> indicates
that color buffer contents are unaffected, while
<constant>EGL_BUFFER_DESTROYED</constant> indicates
that color buffer contents may be destroyed or
changed by the operation.
</para>
<para>
The initial value of
<constant>EGL_SWAP_BEHAVIOR</constant> is chosen by
the implementation.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="notes"><title>Notes</title>
<para>
Attribute <constant>EGL_MULTISAMPLE_RESOLVE</constant> is
supported only if the EGL version is 1.4 or greater.
</para>
<para>
Attribute <constant>EGL_SWAP_BEHAVIOR</constant> is
supported only if the EGL version is 1.2 or greater.
</para>
<para>
If the value of pbuffer attribute
<constant>EGL_TEXTURE_FORMAT</constant> is
<constant>EGL_NO_TEXTURE</constant>, the value of attribute
<constant>EGL_TEXTURE_TARGET</constant> is
<constant>EGL_NO_TEXTURE</constant>, or
<parameter>surface</parameter> is not a pbuffer, then
attribute <constant>EGL_MIPMAP_LEVEL</constant> may be set,
but has no effect.
</para>
</refsect1>
<refsect1 id="errors"><title>Errors</title>
<para>
<constant>EGL_FALSE</constant> is returned on failure,
<constant>EGL_TRUE</constant> otherwise.
</para>
<para>
<constant>EGL_BAD_DISPLAY</constant> is generated if
<parameter>display</parameter> is not an EGL display connection.
</para>
<para>
<constant>EGL_BAD_MATCH</constant> is generated if
<parameter>attribute</parameter> is
<constant>EGL_MULTISAMPLE_RESOLVE</constant>,
<parameter>value</parameter> is
<constant>EGL_MULTISAMPLE_RESOLVE_BOX</constant>, and the
<constant>EGL_SURFACE_TYPE</constant> attribute of the
<type>EGLConfig</type> used to create
<parameter>surface</parameter> does not contain
<constant>EGL_MULTISAMPLE_RESOLVE_BOX_BIT</constant>.
</para>
<para>
<constant>EGL_BAD_MATCH</constant> is generated if
<parameter>attribute</parameter> is
<constant>EGL_SWAP_BEHAVIOR</constant>,
<parameter>value</parameter> is
<constant>EGL_BUFFER_PRESERVED</constant>, and the
<constant>EGL_SURFACE_TYPE</constant> attribute of the
<type>EGLConfig</type> used to create
<parameter>surface</parameter> does not contain
<constant>EGL_SWAP_BEHAVIOR_PRESERVED_BIT</constant>.
</para>
<para>
<constant>EGL_NOT_INITIALIZED</constant> is generated if
<parameter>display</parameter> has not been initialized.
</para>
<para>
<constant>EGL_BAD_SURFACE</constant> is generated if
<parameter>surface</parameter> is not an EGL surface.
</para>
<para>
<constant>EGL_BAD_ATTRIBUTE</constant> is generated if
<parameter>attribute</parameter> is not a valid surface attribute.
</para>
</refsect1>
<refsect1 id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>eglCreatePbufferSurface</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>eglCreatePixmapSurface</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>eglCreateWindowSurface</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>eglQuerySurface</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect3 id="Copyright"><title></title>
<!-- Content included from copyright.inc.xsl -->
<imageobject>
<imagedata fileref="KhronosLogo.jpg" format="jpg" />
</imageobject>
<para />
</refsect3>
</refentry>
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