* Linux: draw on the desktop's GPU, not always the discrete one
egui asks wgpu for the high-performance adapter. On a hybrid laptop in
PRIME on-demand mode (Intel + NVIDIA, X11, GNOME) that is the NVIDIA GPU
while the display server runs on the Intel one, so every frame is copied
between the GPUs. During a resize the window then shows stale or garbled
frames and can stop drawing until it is resized again.
On Linux and the BSDs, ask for no power preference instead: wgpu then
takes the first adapter Vulkan lists, and Mesa's device-select layer lists
the display server's GPU first (or the one DRI_PRIME picks). Measured on
an RTX 4060 + Intel RPL-S laptop: in on-demand mode the list starts with
the Intel GPU, in `prime-select nvidia` mode with the NVIDIA one, so the
launcher draws on whichever GPU drives the screens. WGPU_POWER_PREF still
overrides it. Windows and macOS keep their current choice.
Refs #69
* Linux GPU: keep wgpu's adapter order, but a software rasterizer last
Without Mesa's device-select layer the Vulkan order follows the ICD files, and lavapipe can come
before the real driver.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---------
Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
