shady is a CLI tool to render GLSL shaders.
ledcat is a tool to control lots of LED's over lots of protocols.
ledcat is also a script within the rpi-rgb-led-matrix library, used to display animations on RGB-LED displays.
I use shady with rpi-rgb-led-matrix/ledcat to display animations on my LED-Cube.
1. Install shady
Follow the instructions given in how-to-install-shady-in-raspberry-pi4.
polyfloyd/ledcat :
2. Install :
$ wget https://github.com/polyfloyd/ledcat/releases/download/v0.2.0/ledcat-armv7-unknown-linux-gnueabihf.tar.gz
$ tar -xzf ledcat-armv7-unknown-linux-gnueabihf.tar.gz
$ ./ledcat
3. Test :
see https://github.com/polyfloyd/shady/issues/14
$ export LEDCAT_GEOMETRY=64x64
$ export EGL_PLATFORM=surfaceless
$ export MESA_GL_VERSION_OVERRIDE=3.3
$ shady -i example.glsl -ofmt rgb24 -g 64x64 -f 20 | ledcat -f 20 show
Note : in the above example, the -f 20 parameter must be specified for both commands.
# GPIO for Adafruit RGB Bonnet :
$ shady -i example.glsl -ofmt rgb24 -g 64x64 \
| sudo ledcat --geometry 64x64 hub75 --level-select 22,26,27,20,24 \
--red 5,12 --green 13,16 --blue 6,23 --clock 17 --latch 21 --output-enable 4
$ shady -i example.glsl -g 64x64 -f 20 -ofmt rgb24 \
| sudo ledcat --led-rows=64 --led-cols=64 --led-slowdown-gpio=4 --led-show-refresh \
--led-pwm-bits=11 --led-pwm-lsb-nanoseconds=100 --led-brightness=80 --led-rgb-sequence RBG
rpi-rgb-led-matrix/ledcat.cc
Install :
$ git clone https://github.com/hzeller/rpi-rgb-led-matrix.git
$ cd rpi-rgb-led-matrix/
$ make
Test :
$ cd examples-api-use/
$ sudo ./demo --led-rows=64 --led-cols=64 --led-gpio-mapping=adafruit-hat --led-slowdown-gpio=5 -D 0
$ cat /dev/random | sudo ./ledcat --led-rows=64 --led-cols=64 --led-gpio-mapping=adafruit-hat --led-slowdown-gpio=5
with shady :
$ shady -ofmt rgb24 -g 64x64 -f 20 -i ~/projects/shady/shaders/example.glsl \
| sudo ./ledcat --led-rows=64 --led-cols=64 --led-gpio-mapping=adafruit-hat --led-slowdown-gpio=5
note: param -f 20 is mandatory