author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 21 Jan 2010 18:18:20 +0000 | |
changeset 0 | 89d6a7a84779 |
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-DC8BFEF5-DA50-52DA-8CE2-5729A4A005F6" xml:lang="en"><title>EGL |
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Collection Overview</title><shortdesc>EGL is an interface between EGL client APIs (such as OpenGL ES |
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and OpenVG) and an underlying native platform window system. EGL is independent |
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of definitions and concepts specific to any native window system or rendering |
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API. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>EGL is an open standard developed by the Khronos Group, which |
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is a member-funded industry consortium. Khronos creates open standard, royalty-free |
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APIs to help write and execute dynamic media on a wide variety of platforms |
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and devices. For more information about EGL operations, functions, errors, |
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versions and header files, see <xref href="http://www.khronos.org/egl/" scope="external">http://www.khronos.org/egl/</xref>. </p> |
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<p>In this documentation the term <b>EGL client API</b> is used to mean a |
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rendering API, such as OpenGL ES or OpenVG, that is a client of EGL. </p> |
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<section><title>Introduction to EGL on the Symbian platform</title> <p>EGL |
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provides: </p> <ul> |
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<li id="GUID-DEBBBE4F-8B61-58EF-A4FE-CFC3C63B0223"><p>mechanisms that create |
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rendering surfaces onto which EGL client APIs can draw and which they can |
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share </p> </li> |
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<li id="GUID-1D0D4366-D8B7-50B1-9D5B-1C7BFAC11C94"><p>methods that create |
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and manage graphics contexts for EGL client APIs </p> </li> |
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<li id="GUID-67AC4C95-E548-5275-A151-13AE9F4AFFCB"><p>methods that synchronize |
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drawing by EGL client APIs and Symbian APIs (such as <xref href="GUID-0AEE5955-C530-35F1-A904-69183331B294.dita"><apiname>CWindowGc</apiname></xref>). </p> </li> |
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</ul> <p>One of the purposes of EGL is to provide a means to create EGL client |
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API rendering contexts, and associate them with drawing surfaces. EGL defines |
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three types of drawing surfaces collectively referred to as <codeph>EGLSurfaces</codeph>. |
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These are: </p> <ul> |
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<li id="GUID-21914FD1-9A21-536D-AD5B-09CC15B70ADA"><p> <b>window surfaces</b>, |
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which are used for on-screen rendering into windows that are provided by the |
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Symbian platform (rather than EGL) </p> </li> |
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<li id="GUID-230C6E2A-FC78-57C4-8F58-DDB8684D2385"><p> <b>pbuffer surfaces</b>, |
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which are used for off screen rendering and are entirely provided by EGL </p> </li> |
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<li id="GUID-76001CBC-8E7C-552A-AAC2-76E159FB0FF4"><p> <b>pixmap surfaces</b>, |
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which are used for off screen rendering into pixmap buffers that are provided |
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by the Symbian platform (rather than EGL). </p> </li> |
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</ul> <p>Some key points to note include: </p> <ul> |
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<li id="GUID-6CD11A9A-FF10-5939-9C38-F443397DDD01"><p>EGL objects and their |
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related context state cannot be used outside of the address space in which |
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they are created. </p> </li> |
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<li id="GUID-E8A666F7-1B08-5F18-B117-29B6E35D31C0"><p>EGL enables sharing |
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of certain types of context state among contexts existing in a single address |
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space. </p> </li> |
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</ul> <p><b>Thread-safety </b> </p> <p>Currently EGL and its client APIs are |
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only guaranteed to work correctly on the Symbian platform when they are within |
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a single thread. EGL guarantees sequential ordering within a command stream |
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for each of the EGL client APIs. However, there is no guarantee of sequential |
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ordering between EGL client APIs and Symbian APIs which render into the same |
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surface. </p> <p>EGL client API commands may be asynchronous, in order to |
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prevent impairing the interactive use of the windowing system by the user. |
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For example, otherwise rendering a large texture mapped polygon on a system |
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with no graphics hardware, or drawing a large OpenGL ES vertex array, could |
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prevent a user from invoking a menu soon enough to be usable. </p> <p>Synchronization |
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depends on the client—it can be maintained at moderate cost with the careful |
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use of commands such as <codeph>glFinish</codeph>, <codeph>vgFinish</codeph>, <codeph>eglWaitClient</codeph>, |
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and <codeph>eglWaitNative</codeph>, as well as synchronization commands present |
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in the Symbian APIs. The EGL client API and Symbian API rendering can be done |
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in parallel if the client does not prevent it with explicit synchronization |
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calls. Some performance degradation may be experienced when there is unnecessary |
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switching between EGL client APIs and Symbian API rendering. </p> </section> |
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<section><title>Architectural relationships</title> <p>The following diagram |
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shows the key EGL relationships and dependencies within the Symbian platform. |
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On the Symbian platform, OpenGL ES, OpenVG and EGL all have a component (shown |
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in blue) that declares the interface, and all require an implementation that |
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implements that interface (shown in green). </p> <fig id="GUID-BF9F0E84-F1DA-5D9D-9D4B-14AA55C7DA07"> |
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<title> Key EGL relationships and dependencies </title> |
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<image href="GUID-CBF1D046-92D4-5936-9946-71BB8FC51AB2_d0e181877_href.png" placement="inline"/> |
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</fig> <p>The <xref href="GUID-D252E75C-C8CA-5C51-8DA3-95B937A1295C.dita">EGL Interface |
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component</xref> provides a consistent interface to EGL on the Symbian platform, |
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enabling cross-device compatibility. The component includes the Khronos-released |
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header files (which incorporate some minor changes, such as to the comments). |
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It also provides some Symbian-specific header files and some other files (such |
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as LIB, DEF and MMP files) and UIDs. It does not provide any implementations |
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of the APIs. </p> <p>The EGL Interface component includes the header files |
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for EGL 1.2, 1.3 and 1.4 (which is used by default). The main advantage of |
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EGL 1.4 over previous versions is the introduction of a <b>preserve buffer</b> flag. |
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When supported by the implementation, an EGL window surface can have its color |
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buffer preserved from one frame to the next. This means that the client does |
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not need to send the entire drawing instructions for each frame. Instead the |
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client can simply send the drawing operations for what changes in each frame |
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compared to the previous one. This can reduce the memory footprint and the |
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CPU overhead when an EGL client API renders successive frames. </p> </section> |
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</conbody><related-links> |
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<link href="GUID-8C6D4350-A38D-57A1-8C8D-C777EA7E8A3E.dita"><linktext>EGL |
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Collection</linktext></link> |
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<link href="GUID-1B1C6D35-FFDF-55B3-BCE2-DD0295858E49.dita"><linktext>OpenVG Collection</linktext> |
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</link> |
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<link href="GUID-AB93B01C-B6C2-5B24-ADEF-95706584D625.dita"><linktext>OpenGLES |
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Collection</linktext></link> |
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</related-links></concept> |