OpenGL ES with EGLFS - Raspberry Pi Forums

-

g'day,

i'm quite confused how opengl works on rpi (rpi2 in case), i'm hoping more knowledgeable offer insight. i've built , configured custom qt5 package on eglfs-based raspbian lite image (no x environment). pyqt5 application works nicely part, including use of qopenglwidgets, believe use hardware-accelerated rendering opposed rastered qwidget brothers.

i'm trying implement real-time plotting of data stream. i've tried blitting matplotlib, standard plotting pyqtgraph. both raster-based , cause gui lock up, , can offer <1hz refresh rate. weeks of research, discussions on forums , mailing lists, i've come conclusion vispy solution. vispy offers opengl hardware-accelerated plotting, should provide required refresh rates real-time plotting on rpi. issue i'm having vispy can't find opengl libraries. similarly, can't run glxgears (error: couldn't open display (null)).

assumption opengl es 2.0 configured qt5 installation sufficient, i've tried using in-built opengl option in raspi-config well. guess i'm looking direction here; qopenglwidgets work expected qt5-configured opengl es 2.0, glxgears doesn't? there issue here eglfs?

input/guidance appreciated!

:)

glxgears x-windows application.
experimental opengl drivers in "raspi-config" only x-windows use. ( might wrong )

utilize eglfs best in qt5 (afaik) use qtquick2 modules because uses scenegraph rendering.
http://doc.qt.io/qt-5/qtquick-visualcan ... graph.html

examples find written in qml, qtquick2 can used c++ also.
http://doc.qt.io/qt-5/qtquick-module.html

have collection of standard widgets.
http://doc.qt.io/qt-5/qtquickcontrols-index.html

example qml dataplotter.
https://doc.qt.io/qt-5/qtcharts-qmlosci ... ample.html
http://www.arnorehn.de/blog/2014/12/qui ... lot-items/


raspberrypi



Comments

Post a Comment

Popular posts from this blog

Help with Missing Filename Error?

-
Image
hello everyone! having issue code have had no issues running before. today while trying upload code (no changes made) received error: avr-g++: error: missing filename after '-o' exit status 1 error compiling. this first time have received error. mean? using fastled library adafruit pro trinket. here code using. code: [select] #include <fastled.h> #define led_pin_a     5   // pin connecting left side bank of helmet leds #define led_pin_b     6   // pin connecting right side #define buttonpin     3   //  button change patterns #define num_leds    32    // num of ws2811 leds in each - total 32 x 2 = 64 #define brightness  255 #define led_type    ws2811 #define color_order grb crgb leds[num_leds]; #define updates_per_second 100 crgbpalette16 currentpalette; tblendtype    currentblending; extern crgbpalette16 myredwhitebluepalette; extern const ...
Read more

more info - Joomla! Forum - community, help and support

-
Image
hi all, i wondering if point me in right direction find out more info joomla 1.5.... i've looked around on joomla site can find download. no info there i hoping able read bit before decide if change 1.0.12 version. any great. hi, not sure kind of information looking for, try these: http://help.joomla.org/component/option ... temid,268/ i think documentation j1.5 still in development. kind regards, mame du bois Board index Joomla! Older Version Support Joomla! 1.5 General Questions/New to Joomla! 1.5
Read more

Using phone battery to power a plane.

-
Image
hello, i'm trying mount arduino on falcon rc plane fly using cellphone (via bluetooth), problem haven't got original battery i'm trying find light-weight 1 use it. i've tested mc power lab 3003 , works @ maximum speed 5.0v , 3.11a. the plane has 2 dc motors, no flaps, no slats. turn speeds 1 of them depending on side go to. my actual question if can use nokia lumia 605 battery power motors. have tested half-charged 1 of motors, worked (the 4 seconds tested it). will burn, explode, heat or suitable? its characteristics are: nokia bl-5h 1839mah 3.7v 6.8wh li-ion and question, use arduino motor shield (designed 2dc motors, 2 servos , 1 stepper) handle plane's motors? thanks in advance. you need ask question on model airplane forum. it usual model airplanes draw huge current batteries keep down battery weight. if at, example, hobby king website see lipo batteries have c rating - such 15c or 20c. means can safely deliver current equal 15 (o...
Read more