Hi, On 02/14/2015 08:05 PM, Roberto Garrido Martín wrote: > Hi all, > > We have a windows Qt desktop app that links to a rendering library based > on OpenGL ES 2.0. > We want to assure that the app will run on as much as devices as > possible, so we think that using ANGLE is a good idea. > My question is: is there anything we can do to force our Qt 5.4 app to > use ANGLE instead of the fallback sequence [OpenGL > 2.0 Driver] -> > [ANGLE] -> [Software rasterizer] described here > [http://blog.qt.io/blog/2014/11/27/qt-weekly-21-dynamic-opengl-implementation-loading-in-qt-5-4/]?
FTA, use the QT_OPENGL environment variable (set QT_OPENGL=angle) or the application attribute (QCoreApplication::setAttribute(Qt::AA_UseOpenGLES)). From your results below, it doesn't appear you've tried either. Finally, you can also rebuild Qt with the -opengl es2 switch (which is on by default anyway). This will disable the dynamic GL feature and only use ANGLE. > We have seleted the Qt-ANGLE Kit from QtCreator to build our app. It > compiles, links, and deploys fine. I want to test the initialization > sequence of the render library when ANGLE is used (we have to check the > presence of some GL ES Extensions, and those have to be checked with > EGL), but my dev machine has an OpenGL 4.4 capable Nvidia Graphics card, > and apparently the fallback sequence is being launched, and Qt selects > my OpenGL driver by default, instead of ANGLE. > > I have explicitly linked to QtANGLE’s implementation with -llibGLESv2 > -llibEGL, and used the QtANGLE’s OpenGL ES headers. > > Here the startup trace with GL debugging enabled (env variable > QT_LOGGING_RULES = qt.qpa.gl <http://qt.qpa.gl>=true): > > ----------------------------------------------BEGIN > TRACE--------------------------------------- > qt.qpa.gl <http://qt.qpa.gl>: OpenGL 2.0 entry points available > qt.qpa.gl <http://qt.qpa.gl>: Qt: Using WGL and OpenGL from "opengl32.dll" > qt.qpa.gl <http://qt.qpa.gl>: QOpenGLStaticContext::create OpenGL: > "NVIDIA Corporation","GeForce GTX 570/PCIe/SSE2" default ContextFormat: > v4.5 profile: 0 options: QFlags(0x4 > ),SampleBuffers, Extension-API present > Extensions: 309 > qt.qpa.gl <http://qt.qpa.gl>: > QWindowsIntegration::createPlatformOpenGLContext QSurfaceFormat(version > 2.0, options QFlags(), depthBufferSize 24, redBufferSize -1, greenBuffer > Size -1, blueBufferSize -1, alphaBufferSize -1, stencilBufferSize 8, > samples -1, swapBehavior 2, swapInterval 1, profile 0) > qt.qpa.gl <http://qt.qpa.gl>: "ARB::choosePixelFormat Attributes: > 0x2003 , 0x2027 , 0x2010 , 0x1 , 0x2001 , 0x1 , 0x2014 , 0x18 , 0x2011 > , 0x1 , 0x2022 , 0x18 , 0x2013 , 0x > 202b , 0x201b , 0x8 , 0x2023 , 0x8 , 0x2041 , 0x0 , > obtained px # 10 of 2 > PIXELFORMATDESCRIPTOR dwFlags=0x8225 PFD_DRAW_TO_WINDOW > PFD_SUPPORT_OPENGL PFD_SUPPORT_COMPOSITION PFD_DOUBLEBUFFER iPixelType=0 > cColorBits=32 cRedBit > s=8 cRedShift=16 cGreenBits=8 cGreenShift=8 cBlueBits=8 cBlueShift=0 > cDepthBits=24 cStencilBits=8 cAuxBuffers=4 iLayerType=0 cAlphaBits=8 > cAlphaShift=24 cA > ccumBits=64 cAccumRedBits=16 cAccumGreenBits=16 cAccumBlueBits=16 > cAccumAlphaBits=16" > qt.qpa.gl <http://qt.qpa.gl>: ARB::createContext Creating context > version 2 . 0 3 attributes > qt.qpa.gl <http://qt.qpa.gl>: QWindowsGLContext::QWindowsGLContext > 0x1179548 ARB requested: QSurfaceFormat(version 2.0, options QFlags(), > depthBufferSize 24, redBufferSize > -1, greenBufferSize -1, blueBufferSize -1, alphaBufferSize -1, > stencilBufferSize 8, samples -1, swapBehavior 2, swapInterval 1, profile 0) > obtained # 10 ARB QSurfaceFormat(version 4.5, options QFlags(0x4), > depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize > 8, alphaBuffe > rSize 8, stencilBufferSize 8, samples 0, swapBehavior 2, swapInterval 1, > profile 2) > PIXELFORMATDESCRIPTOR dwFlags=0x8225 PFD_DRAW_TO_WINDOW > PFD_SUPPORT_OPENGL PFD_SUPPORT_COMPOSITION PFD_DOUBLEBUFFER iPixelType=0 > cColorBits=32 cRedBit > s=8 cRedShift=16 cGreenBits=8 cGreenShift=8 cBlueBits=8 cBlueShift=0 > cDepthBits=24 cStencilBits=8 cAuxBuffers=4 iLayerType=0 cAlphaBits=8 > cAlphaShift=24 cA > ccumBits=64 cAccumRedBits=16 cAccumGreenBits=16 cAccumBlueBits=16 > cAccumAlphaBits=16 swap interval: 1 > default: ContextFormat: v4.5 profile: 0 options: QFlags(0x4) > HGLRC=0x30000 > > ----------------------------------------------END > TRACE--------------------------------------- > > So it seems that OpenGL ES 2.0 and EGL are not being used. But, if we > put these lines in the very beginning of the main function of the app: > > QSurfaceFormat format; > format.setRenderableType(QSurfaceFormat::OpenGLES); > QSurfaceFormat::setDefaultFormat(format); > > Then we have the following output: > > ----------------------------------------------BEGIN > TRACE--------------------------------------- > qt.qpa.gl <http://qt.qpa.gl>: OpenGL 2.0 entry points available > qt.qpa.gl <http://qt.qpa.gl>: Qt: Using WGL and OpenGL from "opengl32.dll" > qt.qpa.gl <http://qt.qpa.gl>: QOpenGLStaticContext::create OpenGL: > "NVIDIA Corporation","GeForce GTX 570/PCIe/SSE2" default ContextFormat: > v4.5 profile: 0 options: QFlags(0x4 > ),SampleBuffers, Extension-API present > Extensions: 309 > qt.qpa.gl <http://qt.qpa.gl>: > QWindowsIntegration::createPlatformOpenGLContext QSurfaceFormat(version > 2.0, options QFlags(), depthBufferSize 24, redBufferSize -1, greenBuffer > Size -1, blueBufferSize -1, alphaBufferSize -1, stencilBufferSize 8, > samples -1, swapBehavior 2, swapInterval 1, profile 0) > Failed to create EGL context for format QSurfaceFormat(version 2.0, > options QFlags(), depthBufferSize 24, redBufferSize -1, greenBufferSize > -1, blueBufferS > ize -1, alphaBufferSize -1, stencilBufferSize 8, samples -1, > swapBehavior 2, swapInterval 1, profile 0) . > This is most likely caused by not having the necessary graphics drivers > installed. > Install a driver providing OpenGL 2.0 or higher, or, if this is not > possible, make sure the ANGLE Open GL ES 2.0 emulation libraries > (libEGL.dll, libGLESv2 > .dll and d3dcompiler_*.dll) are available in the application > executable's directory or in a location listed in PATH. > ----------------------------------------------END > TRACE--------------------------------------- > > In this case, in spite of saying that WGL and OpenGL from “opengl32.dll” > are being used by Qt, it tries to create an EGL context, and it fails. > libEGL, libGLES and d3d_compiler dlls are in the same directory as the > executable. > > Any ideas on how can we force GLES 2 ANGLE implementation? > Thanks, > Robert. > > > -- > Website: http://robertogarrido.com > Twitter: http://twitter.com/che1404 > LinkedIn: http://es.linkedin.com/in/robertogarrido/en > > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest > Cheers, Andrew _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
