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-F64E6551-670E-5E12-8103-DE504D3EC94F" xml:lang="en"><title>The |
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Non-ScreenPlay Graphics Architecture</title><shortdesc>ScreenPlay provides improved support for graphics hardware acceleration |
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and some other new features. However, it is possible to use the Symbian platform |
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without enabling ScreenPlay. This is called the non-ScreenPlay variant (sometimes |
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referred to as the <b>non-NGA</b> variant). This topic provides an introduction |
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to the graphics architecture when ScreenPlay is <b>not</b> enabled. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>The following diagram shows the non-ScreenPlay architecture. It includes |
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the components in the Graphics package and some closely related components |
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in other packages. </p> |
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<fig id="GUID-060B8747-36A8-5F2A-BE82-0F637381673A"> |
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<title>The Symbian Foundation non-ScreenPlay graphics architecture </title> |
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<image href="GUID-1EC68F99-C383-5D3A-BAE9-52AF530F8445_d0e162719_href.png" placement="inline"/> |
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</fig> |
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<p>The software model is as follows: </p> |
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<ul> |
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<li id="GUID-8BDB2015-C8FD-51EC-AB19-A55C55DD6D4B"><p>The Hardware Adaptation |
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Layer (HAL) consists of the frame buffer and basic attributes. All processes |
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have equal access to the frame buffer and can both read and write to it. </p> </li> |
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<li id="GUID-06209922-9276-5843-95ED-CCE01A96A67C"><p>The Screen Driver provides |
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simple pixel, scan-line and bitmap operations. The Screen Driver has the same |
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interface for both bitmaps and the frame buffer. Hardware manufacturers can |
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adapt the Screen Driver to suit the available hardware. </p> </li> |
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<li id="GUID-333C52F6-5B6C-5212-8286-B344749550B5"><p>The BitGDI component |
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provides support for higher-level geometric primitives and text. The BitGDI |
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component is implemented in terms of Screen Driver operations. All BitGDI |
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rendering operations are synchronous. </p> </li> |
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<li id="GUID-B542796F-47AE-5B8A-976A-446315EC6550"><p>The Window Server multiplexes |
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access to the screen and provides a BitGDI-like interface. </p> </li> |
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<li id="GUID-81912D86-0CF6-5399-84FF-904E15BA8B50"><p>The Window Server provides |
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Direct Screen Access (DSA) support for applications that require high frame |
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rates (such as video and games) to bypass the Window Server and write to the |
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frame buffer directly. However, some interaction with the Window Server is |
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needed to prevent the application from drawing over other application's data. </p> </li> |
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</ul> |
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<p>In addition, the non-ScreenPlay architecture provides support for EGL, |
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OpenGL and OpenVG. </p> |
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<p>The following diagram shows the rendering stack in the non-ScreenPlay variant. </p> |
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<fig id="GUID-4A245007-BE0A-5DD6-A3D5-CAD9A16E0540"> |
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<title>The rendering stack in the non-ScreenPlay variant</title> |
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<image href="GUID-A51AB0B8-A13D-52D0-BEF8-435F76B30941_d0e162764_href.png" placement="inline"/> |
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</fig> |
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|
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<p>Although DSA provides a solution for applications that require high frame |
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rates, the non-ScreenPlay architecture has limitations when used on graphics |
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accelerated hardware and non-uniform memory models. The architecture may require |
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the copying of buffers between CPU and GPU memory as shown in the following |
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diagram. ScreenPlay provides a solution that requires less copying of buffers |
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in this type of use case. </p> |
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<fig id="GUID-0EAF51D1-173E-52E2-8E28-C5FB7F6F9BD0"> |
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<title> Example non-uniform memory, non-ScreenPlay hardware model </title> |
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<image href="GUID-AB35BA46-87DB-59F0-9342-75550AD338B7_d0e162776_href.png" placement="inline"/> |
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</fig> |
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</conbody><related-links> |
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<link href="GUID-D93978BE-11A3-5CE3-B110-1DEAA5AD566C.dita"><linktext>The ScreenPlay |
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Architecture</linktext></link> |
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<link href="GUID-EF62BF88-3687-505D-8BD7-EEDF36246E56.dita"><linktext>Graphics |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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Hardware Acceleration</linktext></link> |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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<link href="GUID-99BC101A-9466-59EE-B5C9-7622BAF6E6FF.dita"><linktext>Graphics |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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Concepts</linktext></link> |
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Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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</related-links></concept> |