PACKAGES += xserver-xorg-input-evdev xinput xinput-calibrator

define RPICONFIG +=

### Waveshare 5 Inch Display ###
hdmi_group=2
hdmi_mode=87
hdmi_cvt=800 480 60 6 0 0 0
hdmi_drive=1
dtoverlay=ads7846,cs=1,penirq=25,penirq_pull=2,speed=50000,keep_vref_on=0,swapxy=0,pmax=255,xohms=150,xmin=200,xmax=3900,ymin=200,ymax=3900
endef

export display_ws5inch_cfg display_ws5inch_rotation

define display_ws5inch_cfg :=
Section "InputClass"
	Identifier "evdev touchscreen catchall"
	MatchIsTouchscreen "on"
	Option  "Calibration"   "200 3950 250 4000"
	MatchDevicePath "/dev/input/event*"
	Driver "evdev"
EndSection
endef

define display_ws5inch_rotation :=
# Keep touch matrix rotated in accordance with screen rotation
while sleep 3; do
  oldrotate="$${rotate}"
  rotate="$$(xrandr |grep primary)"
  rotate="$${rotate#*+0+0 }"
  rotate="$${rotate% (*}"

  [ "$${oldrotate}" = "$${rotate}" ] || case $$rotate in
    left)     xinput set-prop 'ADS7846 Touchscreen' 'Coordinate Transformation Matrix' 0 -1 1  1 0 0  0 0 1;;
    right)    xinput set-prop 'ADS7846 Touchscreen' 'Coordinate Transformation Matrix' 0 1 0  -1 0 1  0 0 1;;
    inverted) xinput set-prop 'ADS7846 Touchscreen' 'Coordinate Transformation Matrix' -1 0 1  0 -1 1  0 0 1;;
    *)        xinput set-prop 'ADS7846 Touchscreen' 'Coordinate Transformation Matrix' 1 0 0  0 1 0  0 0 1;;
  esac
done &
endef

.PHONY: _display_ws5inch
_config: _display_ws5inch
_display_ws5inch: ${CFGROOT} _copy _mount
	# Rough touch calibration
	mkdir -p "$${CFGROOT}/usr/share/X11/xorg.conf.d/"
	printf '%s\n' "$${display_ws5inch_cfg}" >"$${CFGROOT}/usr/share/X11/xorg.conf.d/45-evdev.conf"
	# Resolution / Rotation stuff
	mkdir -p "$${CFGROOT}/etc/X11/Xsession.d/"
	printf 'xrandr --size 800x480\n' >"$${CFGROOT}/etc/X11/Xsession.d/10display_resolution"
	printf '%s\n' "$$display_ws5inch_rotation" >"$${CFGROOT}/etc/X11/Xsession.d/20touch_rotation"
	# Correct DPI scaling, although application support is mediocre
	mkdir -p "$${CFGROOT}/etc/X11/Xresources/"
	printf 'Xft.dpi: 180\n' >"$${CFGROOT}/etc/X11/Xresources/dpi_resolution"
	# Workaround for applications that do not handle DPI scaling correctly
	-sed -i 's;^Exec=;Exec=env GDK_DPI_SCALE=.5 ;' \
	  $${CFGROOT}/usr/share/applications/chromium*.desktop \
	  $${CFGROOT}/usr/share/applications/firefox*.desktop \
	  $${CFGROOT}/usr/share/applications/exo-web-browser.desktop