vrr.go RawHistoryFolder

1package drm
2
3import (
4	"time"
5
6	"github.com/bnema/neferwl/internal/ports"
7)
8
9// Tearing, variable refresh and content type of frame commits.
10
11// probeAsync checks once whether async commits may carry IN_FENCE_FD.
12func (o *Output) probeAsync(r ports.Renderer) {
13	if o.asyncProbed || !o.tearing {
14		return
15	}
16	o.asyncProbed = true
17	r.UseTarget(o.back)
18	done, err := r.Render(ports.Scene{Background: "#000000"}, nil)
19	if err != nil {
20		return
21	}
22	req := &atomicReq{}
23	req.set(o.primary.id, o.primary.prop("FB_ID"), uint64(o.fbs[o.back]))
24	if done != nil {
25		defer done.Close()
26		req.set(o.primary.id, o.primary.prop("IN_FENCE_FD"), uint64(done.Fd()))
27	}
28	err = o.k.commit(req, atomicTestOnly|flipAsyncFlag, 0)
29	o.asyncFence = err == nil && done != nil
30	o.log.Info().Err(err).Str("connector", o.conn.name).Bool("async_fence", o.asyncFence).Msg("tearing probe")
31}
32
33// wantVRR is the VRR state the next frame commit sets: on while game (a
34// buffer is scanned out or a fullscreen window covers the output), off
35// after vrrHold without it (each toggle may flicker, so short breaks keep
36// it).
37func (o *Output) wantVRR(game bool) bool {
38	if o.vrrProp == 0 {
39		return false
40	}
41	o.vrrGame = game
42	if game {
43		o.composedSince = time.Time{}
44		return true
45	}
46	if o.composedSince.IsZero() {
47		o.composedSince = time.Now()
48	}
49	return o.vrrOn && time.Since(o.composedSince) <= vrrHold
50}
51
52// stateVRR is the VRR state of a commit without a new frame (cursor,
53// vrrOff timer): the last frame's. A shown buffer is not enough: it may
54// be a tiled window on the overlay plane.
55func (o *Output) stateVRR() bool { return o.wantVRR(o.vrrGame) }
56
57// contentProps changes the connector hint only when it differs from the applied value.
58func (o *Output) contentProps(req *atomicReq) {
59	if o.contentProp != 0 && o.contentWanted != o.contentValue {
60		req.set(o.conn.id, o.contentProp, o.contentWanted)
61	}
62}
63
64// wantContent chooses a content hint for the only visible fullscreen window.
65func (o *Output) wantContent(s ports.Scene, surfaces map[ports.WindowID]ports.SurfaceContent) {
66	o.contentWanted = o.contentValues[0]
67	var full *ports.SceneWindow
68	for i := range s.Windows {
69		w := &s.Windows[i]
70		if w.Hidden || w.Rect.W <= 0 || w.Rect.H <= 0 {
71			continue
72		}
73		if !w.Fullscreen || !covers(&s, w) || full != nil {
74			return
75		}
76		full = w
77	}
78	if full == nil {
79		return
80	}
81	switch surfaces[full.ID].ContentType {
82	case ports.ContentPhoto:
83		o.contentWanted = o.contentValues[2]
84	case ports.ContentVideo:
85		o.contentWanted = o.contentValues[3]
86	case ports.ContentGame:
87		o.contentWanted = o.contentValues[4]
88	}
89}
90
91// vrrHold is how long composition runs before VRR turns off.
92const vrrHold = 500 * time.Millisecond
93
94// setAsync logs when the output starts or stops tearing.
95func (o *Output) setAsync(on bool) {
96	if on != o.async {
97		o.async = on
98		o.log.Info().Bool("tearing", on).Str("connector", o.conn.name).Msg("tearing")
99	}
100}