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backend: add timeline feature flag

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The output feature flag has a flaw: it's not possible to check
whether the backend supports timelines during compositor
initialization when we need to figure out whether we want to enable
the linux-drm-syncobj-v1 protocol.

Introduce a backend-wide feature flag to indicate support for
timelines to address this defect.

Closes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3904
This commit is contained in:
Simon Ser 2024-10-10 16:23:49 +02:00 • committed by Alexander Orzechowski
parent 8d8d5f5e94
commit 514c4b4cce
4 changed files with 25 additions and 0 deletions
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6
backend/drm/drm.c
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@ -126,6 +126,12 @@ bool check_drm_features(struct wlr_drm_backend *drm) {
drm->supports_tearing_page_flips = drmGetCap(drm->fd, DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP, &cap) == 0 && cap == 1;
}
drm->backend.features.timeline = drm->iface != &legacy_iface;
if (drm->parent) {
drm->backend.features.timeline = drm->backend.features.timeline &&
drm->mgpu_renderer.wlr_rend->features.timeline;
}
if (env_parse_bool("WLR_DRM_NO_MODIFIERS")) {
wlr_log(WLR_DEBUG, "WLR_DRM_NO_MODIFIERS set, disabling modifiers");
} else {