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presentation-time: make API more flexible

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The wlr_presentation_feedback struct now tracks presentation feedback
for multiple resources (but still a single surface content update). This
allows the compositor to properly send presentation events even when
there is more than one frame of latency or when it references a
surface's buffer.
This commit is contained in:
Simon Ser 2019-11-16 23:44:28 +01:00 • committed by Drew DeVault
parent 3084cee7bc
commit 533ea6d7ef
2 changed files with 120 additions and 70 deletions
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29
include/wlr/types/wlr_presentation_time.h
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@ -28,17 +28,19 @@ struct wlr_presentation {
};
struct wlr_presentation_feedback {
struct wl_resource *resource;
struct wlr_presentation *presentation;
struct wlr_surface *surface;
struct wlr_surface *surface; // NULL if the surface has been destroyed
struct wl_list link; // wlr_presentation::feedbacks
struct wl_list resources; // wl_resource_get_link
// The surface contents were committed.
bool committed;
// The surface contents were sampled by the compositor and are to be
// presented on the next flip. Can become true only after committed becomes
// true.
bool sampled;
bool presented;
struct wl_listener surface_commit;
struct wl_listener surface_destroy;
@ -58,10 +60,25 @@ struct wlr_backend;
struct wlr_presentation *wlr_presentation_create(struct wl_display *display,
struct wlr_backend *backend);
void wlr_presentation_destroy(struct wlr_presentation *presentation);
void wlr_presentation_send_surface_presented(
struct wlr_presentation *presentation, struct wlr_surface *surface,
struct wlr_presentation_event *event);
void wlr_presentation_surface_sampled(
/**
* Mark the current surface's buffer as sampled.
*
* The compositor must call this function when it uses the surface's current
* contents (e.g. when rendering the surface's current texture, when
* referencing its current buffer, or when directly scanning out its current
* buffer). A wlr_presentation_feedback is returned. The compositor should call
* wlr_presentation_feedback_send_presented if this content has been displayed,
* then wlr_presentation_feedback_destroy.
*
* NULL is returned if the client hasn't requested presentation feedback for
* this surface.
*/
struct wlr_presentation_feedback *wlr_presentation_surface_sampled(
struct wlr_presentation *presentation, struct wlr_surface *surface);
void wlr_presentation_feedback_send_presented(
struct wlr_presentation_feedback *feedback,
struct wlr_presentation_event *event);
void wlr_presentation_feedback_destroy(
struct wlr_presentation_feedback *feedback);
#endif