Symbian3/PDK/Source/GUID-8ED4E590-4FDC-4267-87D9-C7E5E57D6B7E.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
parent 14 578be2adaf3e
permissions -rw-r--r--
Initial contribution of the Adaptation Documentation.
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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-8ED4E590-4FDC-4267-87D9-C7E5E57D6B7E" xml:lang="en"><title>EGL
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Resource Profiling Extension</title><shortdesc>This topic describes the EGL resource profiling extension, which
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provides a way to retrieve information about GPU resource utilization. UI
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middleware can use this extension to find out how much memory is being used
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by the objects created by EGL.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>There are two Nokia EGL resource profiling extensions:</p>
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<ul>
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<li><p><b>EGL_NOK_resource_profiling</b>. This extension retrieves data about
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GPU resource usage level in a synchronous way. EGL client applications can
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call <codeph>eglQueryProfilingDataNOK()</codeph> after <codeph>eglInitialize()</codeph> to
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obtain the current resource profiling information.</p></li>
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<li><p><b>EGL_NOK_resource_profiling2</b>. This extension is based on the
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EGL_NOK_resource_profiling extension. EGL_NOK_resource_profiling2 additionally
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provides asynchronous notification of memory usage changes using resource
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profiling sync objects. This uses the <xref href="GUID-DEA883D0-7C53-407A-AC5D-0A3208E667C7.dita">EGL_KHR_reusable_sync </xref> extension.</p></li>
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</ul>
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<section id="GUID-A91A60AC-1DAB-4C48-8B7C-93993DA0A79A"><title><codeph>eglQueryProfilingDataNOK</codeph></title><p>The <codeph>eglQueryProfilingDataNOK()</codeph> extension function retrieves the resource profiling statistics, such as
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the total amount of graphics memory or the amount of private memory used by
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a process. </p><p>To obtain an extension function, clients call <codeph>eglGetProcAddress()</codeph> and
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pass in the function name.</p><p><b>Process ID</b></p><p> The Symbian platform
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has an 8-byte (64-bit) process ID. <codeph>EGLNativeProcessIdTypeNOK</codeph> is
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defined as follows:</p><codeblock xml:space="preserve">typedef TUint64 EGLNativeProcessIdTypeNOK;</codeblock><p>When
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the returned profiling data contains the <codeph>EGL_PROF_PROCESS_ID_NOK</codeph> attribute,
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the next two 32-bit data elements encode the Symbian 64-bit procecss ID. EGL
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Client applications can reconstruct the process ID as follows: </p><codeblock xml:space="preserve">EGLNativeProcessIdTypeNOK processId = ((EGLNativeProcessIdTypeNOK)(data[i]))
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                                      +(((EGLNativeProcessIdTypeNOK)(data[i + 1]))&lt;&lt;32);
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</codeblock></section>
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</conbody><related-links>
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<link href="GUID-A5914CFF-6F86-53E8-9928-36D3379835B1.dita"><linktext>EGL Interface
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Overview</linktext></link>
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<link href="GUID-894AB487-C127-532D-852B-37CB0DEA1440.dita"><linktext>Symbian-Specific
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Behavior</linktext></link>
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<link href="GUID-46813F51-370B-5853-917C-6916925A347D.dita"><linktext>EGL Tutorial</linktext>
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</link>
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<link href="GUID-DC8BFEF5-DA50-52DA-8CE2-5729A4A005F6.dita"><linktext>EGL Collection
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Overview</linktext></link>
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<link href="GUID-DEA883D0-7C53-407A-AC5D-0A3208E667C7.dita"><linktext>EGL Reusable
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Sync Extension</linktext></link>
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</related-links></concept>