I really kicked ha hornets nest. Qt5 compiles on Stretch, but it's got terrible hardware accleration performance (read: none)
There's no difference for me between xcb and eglfs and glxgears is running at 30fps.
$ glxgears -info
GL_RENDERER = Gallium 0.4 on llvmpipe (LLVM 3.9, 128 bits)
GL_VERSION = 3.0 Mesa 13.0.6
GL_VENDOR = VMware, Inc.
GL_RENDERER = Gallium 0.4 on llvmpipe (LLVM 3.9, 128 bits)
GL_VERSION = 3.0 Mesa 13.0.6
GL_VENDOR = VMware, Inc.
...
152 frames in 5.0 seconds = 30.357 FPS
$ qtapp -platform eglfs
libEGL warning: DRI2: failed to authenticate
Unable to query physical screen size, defaulting to 100 dpi.
To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).
Running on a software rasterizer (LLVMpipe), expect limited performance.
libEGL warning: DRI2: failed to authenticate
Unable to query physical screen size, defaulting to 100 dpi.
To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).
Running on a software rasterizer (LLVMpipe), expect limited performance.
What's the best backend to use for Qt on q RPi 3b?
Sent: Thursday, November 08, 2018 at 8:24 AM
From: "Colin Worth" <jlk2...@gmail.com>
To: interest@qt-project.org
Subject: Re: [Interest] Compiling 5.11.2 on a Pi 3B
From: "Colin Worth" <jlk2...@gmail.com>
To: interest@qt-project.org
Subject: Re: [Interest] Compiling 5.11.2 on a Pi 3B
I cross-compiled latest Qt 5.10.1 for Raspberry Pi 3B on linux a few months ago. Disabled es2 configure (-no-eglfs -no-egl). Stretch supports an experimental version of OpenGL for the pi, so platform plugin libxcb is okay. This is a good starting point: https://www.raspberrypi.org/forums/viewtopic.php?t=204529. In addition the configure flags, you can also remove references to egl eglfs from qtbase/mkspecs/devices/linux-rasp-pi3-vc4-g++/qmake.conf in the source tree. Hope this helps.
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Colin
On Nov 8, 2018, at 7:24 AM, interest-requ...@qt-project.org wrote:Re: [Interest] Compiling 5.11.2 on a Pi 3B
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