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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="eglCreateWindowSurface">
+ <refentryinfo>
+ <copyright>
+ <year>2003-2014</year>
+ <holder>The Khronos Group Inc.</holder>
+ </copyright>
+ </refentryinfo>
+ <refmeta>
+ <refentrytitle>eglCreateWindowSurface</refentrytitle>
+ <manvolnum>3G</manvolnum>
+ </refmeta>
+ <refnamediv>
+ <refname>eglCreateWindowSurface</refname>
+ <refpurpose>
+ create a new <acronym>EGL</acronym> window surface
+ </refpurpose>
+ </refnamediv>
+ <refsynopsisdiv>
+ <title>C Specification</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>EGLSurface <function>eglCreateWindowSurface</function></funcdef>
+ <paramdef>EGLDisplay <parameter>display</parameter></paramdef>
+ <paramdef>EGLConfig <parameter>config</parameter></paramdef>
+ <paramdef>NativeWindowType <parameter>native_window</parameter></paramdef>
+ <paramdef>EGLint const * <parameter>attrib_list</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>config</parameter></term>
+ <listitem>
+ <para>Specifies the EGL frame buffer configuration that defines the
+ frame buffer resource available to the surface.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><parameter>native_window</parameter></term>
+ <listitem><para>Specifies the native window.</para></listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><parameter>attrib_list</parameter></term>
+ <listitem><para>
+ Specifies window surface attributes.
+ May be <constant>NULL</constant> or empty
+ (first attribute is <constant>EGL_NONE</constant>).
+ </para></listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+ <refsect1 id="description"><title>Description</title>
+ <para>
+ <function>eglCreateWindowSurface</function> creates an EGL
+ window surface and returns its handle. If
+ <function>eglCreateWindowSurface</function> fails to create
+ a window surface, <constant>EGL_NO_SURFACE</constant> is
+ returned.
+ </para>
+ <para>
+ Surface attributes are specified as a list of
+ attribute-value pairs, terminated with
+ <constant>EGL_NONE</constant>. Accepted attributes
+ are:
+ </para>
+ <variablelist>
+ <varlistentry>
+ <term><constant>EGL_RENDER_BUFFER</constant></term>
+ <listitem>
+ <para>
+ Specifies which buffer should be used for client API
+ rendering to the window. If its value is
+ <constant>EGL_SINGLE_BUFFER</constant>, then client
+ APIs should render directly into the visible window.
+ If its value is
+ <constant>EGL_BACK_BUFFER</constant>, then client
+ APIs should render into the back buffer. The default
+ value of <constant>EGL_RENDER_BUFFER</constant> is
+ <constant>EGL_BACK_BUFFER</constant>.
+ </para>
+ <para>
+ Client APIs may not be able to respect the requested
+ rendering buffer. To determine the actual buffer
+ being rendered to by a context, call
+ <citerefentry><refentrytitle>eglQueryContext</refentrytitle></citerefentry>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><constant>EGL_VG_ALPHA_FORMAT</constant></term>
+ <listitem>
+ <para>
+ Specifies how alpha values are interpreted by OpenVG
+ when rendering to the surface. If its value is
+ <constant>EGL_VG_ALPHA_FORMAT_NONPRE</constant>,
+ then alpha values are not premultipled. If its value
+ is <constant>EGL_VG_ALPHA_FORMAT_PRE</constant>,
+ then alpha values are premultiplied. The default
+ value of <constant>EGL_VG_ALPHA_FORMAT</constant> is
+ <constant>EGL_VG_ALPHA_FORMAT_NONPRE</constant>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><constant>EGL_VG_COLORSPACE</constant></term>
+ <listitem>
+ <para>
+ Specifies the color space used by OpenVG when
+ rendering to the surface. If its value is
+ <constant>EGL_VG_COLORSPACE_sRGB</constant>, then a
+ non-linear, perceptually uniform color space is
+ assumed, with a corresponding
+ <type>VGImageFormat</type> of form
+ <constant>VG_s*</constant>. If its value is
+ <constant>EGL_VG_COLORSPACE_LINEAR</constant>, then
+ a linear color space is assumed, with a
+ corresponding <type>VGImageFormat</type> of form
+ <constant>VG_l*</constant>. The default value of
+ <constant>EGL_VG_COLORSPACE</constant> is
+ <constant>EGL_VG_COLORSPACE_sRGB</constant>.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ <para>
+ Any EGL rendering context that was created with respect to
+ <parameter>config</parameter> can be used to render into the
+ surface. Use
+ <citerefentry><refentrytitle>eglMakeCurrent</refentrytitle></citerefentry>
+ to attach an EGL rendering context to the surface.
+ </para>
+ <para>
+ Use
+ <citerefentry><refentrytitle>eglQuerySurface</refentrytitle></citerefentry>
+ to retrieve the ID of <parameter>config</parameter>.
+ </para>
+ <para>
+ Use
+ <citerefentry><refentrytitle>eglDestroySurface</refentrytitle></citerefentry>
+ to destroy the surface.
+ </para>
+ </refsect1>
+ <refsect1 id="notes"><title>Notes</title>
+ <para>
+ Attributes <constant>EGL_RENDER_BUFFER</constant>,
+ <constant>EGL_VG_ALPHA_FORMAT</constant>, and
+ <constant>EGL_VG_COLORSPACE</constant>, and the
+ corresponding attribute values, are supported only if the
+ EGL version is 1.2 or greater.
+ </para>
+ <!-- Might want to mention aliasing of EGL_VG_* -> EGL_* that occurred in EGL 1.3 -->
+ <para>
+ The <constant>EGL_VG_ALPHA_FORMAT</constant> and
+ <constant>EGL_VG_COLORSPACE</constant> attributes are used
+ only by OpenVG. EGL itself, and other client APIs such as
+ OpenGL and OpenGL ES , do not distinguish multiple
+ colorspace models. Refer to section 11.2 of the OpenVG 1.0
+ specification for more information. The native window
+ system's use and interpretation of alpha values is outside
+ the scope of EGL, although the preferred behavior is for the
+ window system to ignore the value of
+ <constant>EGL_VG_ALPHA_FORMAT</constant> when compositing
+ window surfaces.
+ </para>
+ </refsect1>
+ <refsect1 id="errors"><title>Errors</title>
+ <para>
+ <constant>EGL_NO_SURFACE</constant> is returned if creation of
+ the context fails.
+ </para>
+ <para>
+ <constant>EGL_BAD_DISPLAY</constant> is generated if
+ <parameter>display</parameter> is not an EGL display connection.
+ </para>
+ <para>
+ <constant>EGL_NOT_INITIALIZED</constant> is generated if
+ <parameter>display</parameter> has not been initialized.
+ </para>
+ <para>
+ <constant>EGL_BAD_CONFIG</constant> is generated if
+ <parameter>config</parameter> is not an EGL frame buffer configuration.
+ </para>
+ <para>
+ <constant>EGL_BAD_NATIVE_WINDOW</constant> may be generated if
+ <parameter>native_window</parameter> is not a valid native window.
+ </para>
+ <para>
+ <constant>EGL_BAD_ATTRIBUTE</constant> is generated if
+ <parameter>attrib_list</parameter> contains an invalid window attribute
+ or if an attribute value is not recognized or is out of range.
+ </para>
+ <para>
+ <constant>EGL_BAD_ALLOC</constant> is generated if there are not
+ enough resources to allocate the new surface.
+ </para>
+ <para>
+ <constant>EGL_BAD_MATCH</constant> is generated if the attributes of
+ <parameter>native_window</parameter> do not correspond to
+ <parameter>config</parameter> or if
+ <parameter>config</parameter> does not support rendering to windows
+ (the <constant>EGL_SURFACE_TYPE</constant> attribute does not contain
+ <constant>EGL_WINDOW_BIT</constant>).
+ </para>
+ <para>
+ <constant>EGL_BAD_MATCH</constant> is generated if
+ <parameter>config</parameter> does not support the specified
+ OpenVG alpha format attribute (the value of
+ <constant>EGL_VG_ALPHA_FORMAT</constant> is
+ <constant>EGL_VG_ALPHA_FORMAT_PRE</constant> and the
+ <constant>EGL_VG_ALPHA_FORMAT_PRE_BIT</constant> is not set
+ in the <constant>EGL_SURFACE_TYPE</constant> attribute of
+ <parameter>config</parameter>) or colorspace attribute (the
+ value of <constant>EGL_VG_COLORSPACE</constant> is
+ <constant>EGL_VG_COLORSPACE_LINEAR</constant> and the
+ <constant>EGL_VG_COLORSPACE_LINEAR_IT</constant> is not set
+ in the <constant>EGL_SURFACE_TYPE</constant> attribute of
+ <parameter>config</parameter>).
+ </para>
+ </refsect1>
+ <refsect1 id="seealso"><title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>eglDestroySurface</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglChooseConfig</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglGetConfigs</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglMakeCurrent</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>