retropie and waveshare 32b

git clone https://github.com/swkim01/waveshare-dtoverlays.git
sudo cp waveshare-dtoverlays/waveshare32b-overlay.dtb /boot/overlays/waveshare32b.dtbo

sudo nano /boot/config.txt

dtparam=spi=on
dtoverlay=waveshare32b

sudo apt-get install cmake
git clone https://github.com/tasanakorn/rpi-fbcp
cd rpi-fbcp/
mkdir build
cd build/
cmake ..
make
sudo install fbcp /usr/local/bin/fbcp 

sudo nano /etc/rc.local

/usr/local/bin/fbcp &

reboot