<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

<!-- This component and the accompanying materials are made available under the terms of the License 

"Eclipse Public License v1.0" which accompanies this distribution, 

and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->

<!-- Initial Contributors:

    Nokia Corporation - initial contribution.

Contributors: 

-->

<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-04D917A1-E1A0-5149-9660-80A1146D0984" xml:lang="en"><title>OpenGLES

Collection Overview</title><shortdesc>OpenGL ES is a cross-platform API for 2D and 3D graphics on embedded

systems. It consists of a subset of desktop OpenGL, which is a widely adopted

2D and 3D graphics API, creating a low-level interface between software and

graphics acceleration. OpenGL ES includes profiles for floating-point and

fixed-point systems and the EGL specification for portably binding to native

windowing systems. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p> <b>Variant</b>: <xref href="GUID-D93978BE-11A3-5CE3-B110-1DEAA5AD566C.dita">ScreenPlay</xref> and <xref href="GUID-F64E6551-670E-5E12-8103-DE504D3EC94F.dita">non-ScreenPlay</xref>. </p>

<p>The Symbian platform supports two versions of OpenGL ES: </p>

<ul>

<li id="GUID-09B72D5B-EF77-5317-90C9-B048241D8569"><p>OpenGL ES 1.X, which

is for fixed function hardware and offers acceleration, image quality and

performance. </p> </li>

<li id="GUID-F9E98024-8198-586D-8E97-C00EB090158E"><p>OpenGL ES 2.X, which

is for programmable hardware and enables fully programmable 3D graphics and

shader objects. </p> </li>

</ul>

<p>OpenGL ES is an open standard developed by the Khronos Group (<xref href="http://www.khronos.org/" scope="external">www.khronos.org</xref>). </p>

<p>The following diagram shows the direct use of OpenGL ES by an application

through the public OpenGL ES interface together with EGL. On the Symbian platform,

both OpenGL ES and EGL have a component (shown in blue) that declares the

interface, and both require an implementation that implements that interface

(shown in green). </p>

<fig id="GUID-41677786-E59F-5DF7-97BB-05D7FDA0950C">

<title>           OpenGLES component relationships          </title>

</fig>

<p>It is possible for the OpenGL ES and EGL implementations to communicate

through a private interface that is not standardized by Symbian. </p>

<ul>

<li id="GUID-537E019E-A415-5C6B-A144-D5AD3494E35B"><p>The <xref href="GUID-CBC43846-22BB-5AAF-89FE-3CF4F11B76F6.dita">OpenGLES

Interface component</xref> provides a consistent interface to OpenGL ES on

the Symbian platform, enabling cross-device compatibility. The component includes

the Khronos-released header files (which incorporate some minor changes, such

as in-source comments). It also provides some Symbian-specific header files

and LIB, DEF and MMP files and UIDs. It does not provide any implementations

of the APIs. </p> </li>

<li id="GUID-712E1F08-6F6F-5E84-A9F1-3EC06D089E62"><p><xref href="GUID-8C6D4350-A38D-57A1-8C8D-C777EA7E8A3E.dita">EGL</xref> is

an interface between rendering APIs such as OpenGL ES or OpenVG and an underlying

native platform window system. </p> </li>

</ul>

</conbody><related-links>

<link href="GUID-AB93B01C-B6C2-5B24-ADEF-95706584D625.dita"><linktext>OpenGLES

Collection</linktext></link>

<link href="GUID-8C6D4350-A38D-57A1-8C8D-C777EA7E8A3E.dita"><linktext>EGL     

           Collection</linktext></link>

</related-links></concept>