tearing.go RawHistoryFolder

1package wayland
2
3import (
4	"github.com/bnema/go-wayland-bindings/server/tearingcontrol"
5	"github.com/bnema/go-wayland-bindings/server/wayland"
6	"github.com/bnema/purego-libwayland/server"
7)
8
9// Tearing control: a surface asks for async presentation. Outputs honour it
10// only when they scan the surface out directly (ADR 006); the hint is
11// double-buffered state applied on commit.
12
13func registerTearing(d *server.Display, s *Server) error {
14	return tearingcontrol.NewWpTearingControlManagerV1Global(d, 1, func(c server.Client, v, id uint32) {
15		_, _ = tearingcontrol.NewWpTearingControlManagerV1(c, int32(v), id, tearingManager{s})
16	})
17}
18
19type tearingManager struct{ server *Server }
20
21func (tearingManager) Destroy(*tearingcontrol.WpTearingControlManagerV1) {}
22
23func (m tearingManager) GetTearingControl(r *tearingcontrol.WpTearingControlManagerV1, id uint32, surf *wayland.Surface) {
24	var state *surface
25	if surf != nil {
26		state = m.server.surfaces[surf.Resource]
27	}
28	if state != nil && state.tearing != nil {
29		r.PostError(uint32(tearingcontrol.WpTearingControlManagerV1ErrorTearingControlExists), "surface already has a tearing control")
30		return
31	}
32	h := &tearingHandler{surface: state}
33	res, err := tearingcontrol.NewWpTearingControlV1(r.Client(), r.Version(), id, h)
34	if err != nil || state == nil {
35		return
36	}
37	state.tearing = h
38	res.OnDestroy = func() {
39		// Back to vsync on the next commit.
40		if state.tearing == h {
41			state.tearing = nil
42			state.next.async = false
43		}
44	}
45}
46
47type tearingHandler struct{ surface *surface }
48
49func (h *tearingHandler) SetPresentationHint(_ *tearingcontrol.WpTearingControlV1, hint uint32) {
50	if h.surface != nil && h.surface.tearing == h {
51		h.surface.next.async = hint == uint32(tearingcontrol.WpTearingControlV1PresentationHintAsync)
52	}
53}
54
55func (*tearingHandler) Destroy(*tearingcontrol.WpTearingControlV1) {}