author | Dominic Pinkman <dominic.pinkman@nokia.com> |
Tue, 20 Jul 2010 12:00:49 +0100 | |
changeset 13 | 48780e181b38 |
parent 7 | 51a74ef9ed63 |
permissions | -rw-r--r-- |
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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-FFA5956E-0632-42F5-A2F9-0503888EF72B" xml:lang="en"><title>EGL |
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Reference Implementation Component</title><shortdesc>The EGL Reference Implementation component implements the minimum |
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EGL functionality to support OpenWF composition. It does not implement the |
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EGL functionality required to support the use of the Khronos rendering APIs, |
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such as OpenGL ES and OpenVG. Typically device creators replace the reference |
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implementation with a fully functional implementation of their own. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p><b>Target audience</b>: Device creators. </p> |
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<section id="GUID-3400F826-F4A6-4BCA-BF98-9CD941532B8A"><title>Implemented |
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APIs</title><p>The EGL Reference Implementation implements the following EGL |
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1.4 APIs: </p><ul> |
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<li><codeph>eglGetError()</codeph></li> |
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<li><codeph>eglGetDisplay()</codeph></li> |
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<li><codeph>eglInitialize()</codeph></li> |
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<li><codeph>eglTerminate()</codeph></li> |
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<li><codeph>eglReleaseThread()</codeph></li> |
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<li><codeph>eglQueryString()</codeph></li> |
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<li><codeph>eglGetProcAddress()</codeph></li> |
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</ul><p>The EGL Reference Implementation also implements the following reusable |
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sync extension functions:</p><ul> |
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<li><codeph>eglCreateSyncKHR()</codeph></li> |
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<li><codeph>eglDestroySyncKHR()</codeph></li> |
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<li><codeph>eglClientWaitSyncKHR()</codeph></li> |
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<li><codeph>eglSignalSyncKHR()</codeph></li> |
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<li><codeph>eglGetSyncAttribKHR()</codeph></li> |
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</ul><p>The Reference Implementation implements <codeph>eglGetProcAddress()</codeph> , |
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which supports retrieving OpenWF-C extension functions. </p><p>Calling any |
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of the unsupported APIs panics the client with the <codeph>EEglPanicNotSupported</codeph> panic |
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code and the return value and EGL error code are undefined. This behavior |
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deliberately does not conform to the EGL specification. It is intended to |
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make it easy to detect errors in the platform configuration—for example, where |
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the intention was to use a fully-functional EGL implementation instead of |
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the Reference Implementation.</p></section> |
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<section id="GUID-264ED891-CB0A-4D6D-8640-8A11A9BD79A5"><title>Implementation-specific |
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information</title><p>The Reference Implementation returns the following implementation-specific |
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strings: </p><table id="GUID-EAEA383C-E4ED-4C11-A957-6EFFEECDE6BD"> |
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<tgroup cols="2"><colspec colname="col1"/><colspec colname="col2"/> |
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<thead> |
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<row> |
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<entry valign="top">String</entry> |
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<entry valign="top">Value</entry> |
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</row> |
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</thead> |
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<tbody> |
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<row> |
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<entry>EGL_CLIENT_APIS</entry> |
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<entry>“”</entry> |
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</row> |
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<row> |
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<entry>EGL_EXTENSIONS</entry> |
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<entry>“EGL_KHR_reusable_sync”</entry> |
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</row> |
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<row> |
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<entry>EGL_VENDOR</entry> |
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<entry>“Nokia”</entry> |
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</row> |
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<row> |
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<entry>EGL_VERSION</entry> |
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<entry>“1.4 Reference EGL”</entry> |
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</row> |
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</tbody> |
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</tgroup> |
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</table></section> |
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|
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<section id="GUID-8ED3006D-56A3-4512-A1A8-0E88149C236B"><title>Thread handling</title><p>The |
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Reference Implementation allows the supported EGL APIs to be used from multiple |
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threads within the same process. The Reference Implementation maintains the |
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process and thread state in order to conform to the correct behavior described |
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in the EGL specification. Access to process-wide objects is serialized and |
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protected by mutex to prevent race conditions.</p><p>The Reference Implementation |
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uses its own heap to allow the creation, access and destruction of process-wide |
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objects from any thread. This includes the <codeph>EGLDisplay</codeph> and <codeph>EGLSync</codeph> objects. |
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The heap is created in a local chunk.</p><p>For simplicity, the Reference |
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Implementation supports only one display: <codeph>EGL_DEFAULT_DISPLAY</codeph>. |
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A request to obtain any other <codeph>EGLDisplay</codeph> returns <codeph>EGL_NO_DISPLAY</codeph>. <codeph>EGLDisplay</codeph> is |
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a process-wide resource that can be accessed from any thread. Its behavior |
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follows the EGL specification for <codeph>eglGetDisplay()</codeph>, <codeph>eglInitialize()</codeph> and <codeph>eglTerminate()</codeph>.</p><p>Each |
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client thread can have its own EGL error. Error handling and thread state |
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management follows the EGL specification for <codeph>eglGetError()</codeph> and <codeph>eglReleaseThread()</codeph>.</p></section> |
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<section id="GUID-8B9FB71D-8DC8-4944-9DA8-AEC821C1041D"><title>DLL summary</title><table id="GUID-80E05C78-5FD4-5489-A1DA-A759EB7F9530"> |
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<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/> |
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<thead> |
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<row> |
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<entry>DLL</entry> |
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<entry>Description</entry> |
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</row> |
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</thead> |
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<tbody> |
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<row> |
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<entry><filepath>libegl_ref.dll</filepath> </entry> |
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<entry>The EGL reference implementation. </entry> |
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</row> |
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<row> |
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<entry><filepath>libEGL.dll</filepath></entry> |
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<entry>In the emulator, this provides a mechanism that switches among different |
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EGL implementation DLLs used in different scenarios, including the Reference |
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Implementation mentioned above. For ARM builds, the file above is renamed |
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to this during the ROM build process. This is controlled by IBY files.</entry> |
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</row> |
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</tbody> |
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</tgroup> |
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</table><p>To allow different EGL implementations to be used on a platform, |
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the Reference Implementation is built with a target name of <filepath>libegl_ref.dll</filepath>. |
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However, EGL Clients should link their code against <filepath>libEGL.lib</filepath>.</p></section> |
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<section id="GUID-0685C8AA-5F35-49B7-BF02-C147BCDCCE89"><title>Enabling the |
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EGL Reference Implementation</title><p><b>Emulator</b></p><p>To enable the |
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ScreenPlay OpenWF-C components and the EGL Reference Implementation in the |
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emulator, add the following lines to the <filepath>\epoc32\data\epoc.ini</filepath> file:</p><codeblock xml:space="preserve">SYMBIAN_GRAPHICS_USE_OPENWF |
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SYMBIAN_GRAPHICS_USE_EGL_REF</codeblock></section> |
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</conbody><related-links> |
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|
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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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</related-links></concept> |