Hi Alistair, Great work,before we used a GLES Modified SDL+ANGLE to let OSG run in directx mode. zhuwan 07,11,2014
在2014-7-10 21:16:25，"Alistair Baxter" <[email protected]> 写道: -----原始邮件----- 发件人: "Alistair Baxter" <[email protected]> 发送时间: 2014-7-10 21:16:25 收件人: "OpenSceneGraph Users" <[email protected]> 主题: [osg-users] OpenSceneGraph using ANGLE on Windows We have been developing a cross-platform tablet app using Qt Quick integrated with OpenSceneGraph in a similar way to that described here: http://qt-project.org/forums/viewthread/31277 Qt 5 is available set up to use both desktop OpenGL and Google’s ANGLE wrapper for Direct3D ( https://code.google.com/p/angleproject/ ), so I was interested to see if I could make OSG, and osgEarth, work in this environment, since I had seen ANGLE mentioned several times on this mailing list, but no evidence of any development with it. Qt official advice recommends ANGLE for the following situations: · You need OpenGL ES features, but not full OpenGL · You have a heterogeneous user base with different Windows versions & graphics cards · You do not want your user to have to install a recent graphics card driver · Your application needs to run over Windows Remote Desktop Protocol And in addition, it forms a step towards getting OSG going on Windows RT 8.1 and Windows Phone 8.1. I am pleased to report that I have both packages working with ANGLE now to my satisfaction, and have had it running for a few weeks now, with shaders and other rendering code identical between desktop Windows, iOS and Android. I outline here the steps I had to take so that others may follow my example, or that the build system issues I faced might be sorted out. I started my most recent build with the following: · OSG developer release 3.3.2 · osgEarth trunk (08/07/2014) · Visual Studio 2013 Pro update 2 · OSG prebuilt dependencies for VS2013 · Qt Enterprise 5.3.1 for VS2013 32-bit, without Desktop OpenGL (I see no reason why this shouldn’t work as well with Qt Open Source) · Sqlite and geos, built from source with VS2013 for osgEarth The process I followed was as follows · Using CMake Gui, Configure osg for OpenGL ES 2.0 (as per here http://trac.openscenegraph.org/projects/osg/wiki/Community/OpenGL-ES ) · Set the opengl library to be libgles2 (release) and libgles2d (debug) · Set use Qt to OFF · Create visual studio project Then in Visual Studio · Remove GraphicsWindowWin32 and PixelBufferWin32 cpp files from the osgViewer project · Add to the Include Directories in the VC++ Directories section of all the project properties <qtdir>\include\QtANGLE · Add to the Libraries Directories <qtdir>\lib (group-selecting all the projects in Solution Explorer makes that easier) · Edit the osg::getGLExtensionFuncPtr function to load libgles2d.dll for debug builds · Build the solution OsgEarth requires similar changes – set the name of the opengl es library appropriately in CMake, and add the include and library paths in Visual Studio. It was then possible to integrate osg with QT Quick’s ANGLE-based OpenGL ES 2.0 contexts by overriding the background-drawing code of QQuickView using osgViewer::GraphicsWindowEmbedded. The principal remaining issue is that neither the osgviewer executable nor any of the examples will run, since there is no code to set up windows for them – that would require integration of ANGLE’s version of EGL in place of the deleted GraphicsWindowWin32 etc. Also, this build process is not compatible with osgQt, but it should be able to be made compatible, since the old QGLWidget code should still work via ANGLE if it is made to use OpenGL ES 2.0 calls. I did not need any of that though, so I have not investigated further. Hopefully this information will be useful for anyone else who wants to use ANGLE on Windows with OpenSceneGraph, and it would be great if somebody who is sufficiently expert with CMake could fix the setup issues so that there was less hacking of the generated Visual Studio projects required. Alistair Baxter Software Engineer ________________________________ Have you upgraded FieldMove Clino to FieldMove Clino Pro? In-app purchase from these app stores: Midland Valley Exploration Ltd. 2 West Regent Street Glasgow G2 1RW United Kingdom Tel: +44 (0) 141 332 2681 Fax: +44 (0) 141 332 6792 The structural geology experts
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