> Check with QSG_INFO what you get. It may either be 8880 or 8888 Yes, seems this:
{code} QQuickView view; QSurfaceFormat format; format.setAlphaBufferSize(8); view.setFormat(format); {code} same as QT_QPA_EGLFS_FORCE888, I got: {quote} qt.scenegraph.general: texture atlas dimensions: 2048x2048 qt.scenegraph.general: R/G/B/A Buffers: 8 8 8 8 qt.scenegraph.general: Depth Buffer: 0 qt.scenegraph.general: Stencil Buffer: 0 qt.scenegraph.general: Samples: 0 qt.scenegraph.general: GL_VENDOR: NVIDIA Corporation qt.scenegraph.general: GL_RENDERER: NVIDIA Tegra 3 qt.scenegraph.general: GL_VERSION: OpenGL ES 2.0 14.01002 {quote} BUT: I faced with randomly flickering (with a random white polygons on a black background on 1/2 - 1/3 of height of my display) when an QML animation is running.. sad sad sad... :( I have tried to setup a different buffer's sizes, intervals, and other properties to QSurfaceFormat, but it did not help. It works without flickering only with RGBA=5650, but then I see borders of gradients of images.. :( 2016-08-04 18:39 GMT+03:00 Laszlo Agocs <laszlo.ag...@qt.io>: > > Hi Denis, > > > QSurfaceFormat::setDefaultFormat() with a format of red/blue/green set to > 8, or alternatively setting QT_QPA_EGLFS_FORCE888 is indeed what you need. > The default format with unspecified sizes results in choosing 16 over 32 > bit configs when both are offered, that's normal. > > > Check with QSG_INFO what you get. It may either be 8880 or 8888, depending > on what is offered by the EGL implementation. As for the 24 bit depth, > regardless of what X or EGL says, under the hood it is quite likely that > you have 32 bit framebuffers anyway, true packed 24 bit ones are probably > rare. > > > As for the "other bad issues", the flickering, that is the real issue > here, but that's likely caused by something else outside of Qt's scope. > > > Best regards, > > Laszlo > ------------------------------ > *From:* Denis Shienkov <denis.shien...@gmail.com> > *Sent:* Thursday, August 4, 2016 4:48:40 PM > *To:* development@qt-project.org; Laszlo Agocs > *Subject:* [QML][EGLFS] Bits depth > > Hi guys, > > I have use Qt 5.7 on Linux Embedded board (Toradex Apalis T30) with the > EGLFS via X11 platform (NVidia drivers). > > My QML application uses 24-bit PNG images. But I see that these images is > looks like 16-bit (I see the gradients borders, and it looks ugly), > howewer my X11 uses DefaultDepth == 24!!! > > Also this command: > > {quote} > root@apalis-t30:~/deploy-apps# xdpyinfo | grep 'depth of root' > depth of root window: 24 planes > {quote} > > shows 24-bit mode too. > > Next, I have added this debug env variable: > > {quote} > export QSG_INFO=1 > {quote} > > to see what happens when my QML app starts: > > {quote} > ... > qt.scenegraph.general: threaded render loop > qt.scenegraph.general: Using sg animation driver > qt.scenegraph.general: Animation Driver: using vsync: 16.67 ms > qt.scenegraph.general: Animation Driver: using vsync: 16.67 ms > qt.scenegraph.general: texture atlas dimensions: 2048x2048 > qt.scenegraph.general: R/G/B/A Buffers: 5 6 5 0 > qt.scenegraph.general: Depth Buffer: 16 > qt.scenegraph.general: Stencil Buffer: 8 > qt.scenegraph.general: Samples: 0 > qt.scenegraph.general: GL_VENDOR: NVIDIA Corporation > qt.scenegraph.general: GL_RENDERER: NVIDIA Tegra 3 > ... > {quote} > > I see that OpenGL (yes?) initializes with the "R/G/B/A Buffers: 5 6 5 > 0" mode, > that is 16-bit depth!!! O_O > > Next, I have tried to change the FB depth via: > > {quote} > fbset -fb /dev/fb1 -depth 24 > {quote} > > I see that FB changes own settings, but nothing changes when my app starts, > it still shows images ugly, as 16-bit depth. > > Also I have tried to use QT_QPA_EGLFS_DEPTH variable (with 16, 24 or 32), > but nothing changes, not helps. > > Helps only the QT_QPA_EGLFS_FORCE888 variable, but it introduces others > bad issues, > like the whole/half HDMI display flickering.. So, I can not to use > QT_QPA_EGLFS_FORCE888.. > > So, is there are any tricks to use 24-bit depth? > > BR, > Denis >
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