[Unit]
Description=Headless Sway compositor for Sunshine wlr capture
# Don't auto-restart on `systemctl --user stop` — but bring sway back if it
# actually crashes mid-stream.
After=graphical-session-pre.target
PartOf=graphical-session.target

[Service]
Type=simple

# Tell wlroots to use the headless backend (no DRM master needed) and skip
# libinput device probing — there are no input devices on a real headless box.
#
# GLES2 renderer: the Vulkan backend strictly requires
# VK_EXT_external_memory_dma_buf, which the proprietary NVIDIA driver
# doesn't expose on every build (esp. data-center / -server branches). GLES2
# is universally available and Sunshine's capture path uses its own dma-buf
# flow, so we don't lose hardware acceleration.
Environment=WLR_BACKENDS=headless
Environment=WLR_LIBINPUT_NO_DEVICES=1
# Pixman (software) renderer. The GLES2 path needs a GBM-allocated framebuffer,
# which fails on the proprietary NVIDIA driver: its GBM bridge doesn't permit
# unprivileged CREATE_DUMB even on render nodes (Mesa drivers do). The trade-
# off: Sunshine's wlr-screencopy then takes the shm path and uses libx264
# software encoding. For NVENC on NVIDIA cloud GPUs, sunshine should be
# pointed at a virtual KMS connector (vkms or Xorg+Dummy) instead of wlroots.
Environment=WLR_RENDERER=pixman
Environment=XDG_SESSION_TYPE=wayland

ExecStart=/usr/bin/sway --config %h/.config/sway/config-headless --unsupported-gpu

Restart=on-failure
RestartSec=2s
TimeoutStopSec=5s

[Install]
WantedBy=default.target