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backend: add get_present_clock

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This commit is contained in:
emersion 2018-10-01 22:44:33 +02:00
parent 9203bfdd4f
commit 54e1287f30
7 changed files with 33 additions and 6 deletions
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7
backend/backend.c
View file

@ -64,6 +64,13 @@ struct wlr_session *wlr_backend_get_session(struct wlr_backend *backend) {
return NULL;
}
clockid_t wlr_backend_get_present_clock(struct wlr_backend *backend) {
if (backend->impl->get_present_clock) {
return backend->impl->get_present_clock(backend);
}
return CLOCK_MONOTONIC;
}
static size_t parse_outputs_env(const char *name) {
const char *outputs_str = getenv(name);
if (outputs_str == NULL) {

6
backend/drm/backend.c
View file

@ -65,10 +65,16 @@ static struct wlr_renderer *backend_get_renderer(
}
}
static clockid_t backend_get_present_clock(struct wlr_backend *backend) {
struct wlr_drm_backend *drm = get_drm_backend_from_backend(backend);
return drm->clock;
}
static struct wlr_backend_impl backend_impl = {
.start = backend_start,
.destroy = backend_destroy,
.get_renderer = backend_get_renderer,
.get_present_clock = backend_get_present_clock,
};
bool wlr_backend_is_drm(struct wlr_backend *b) {

12
backend/drm/drm.c
View file

@ -1,3 +1,4 @@
#define _POSIX_C_SOURCE 199309L
#include <assert.h>
#include <drm_mode.h>
#include <EGL/egl.h>
@ -27,8 +28,8 @@
#include "util/signal.h"
bool check_drm_features(struct wlr_drm_backend *drm) {
uint64_t cap;
if (drm->parent) {
uint64_t cap;
if (drmGetCap(drm->fd, DRM_CAP_PRIME, &cap) ||
!(cap & DRM_PRIME_CAP_IMPORT)) {
wlr_log(WLR_ERROR,
@ -51,16 +52,21 @@ bool check_drm_features(struct wlr_drm_backend *drm) {
const char *no_atomic = getenv("WLR_DRM_NO_ATOMIC");
if (no_atomic && strcmp(no_atomic, "1") == 0) {
wlr_log(WLR_DEBUG, "WLR_DRM_NO_ATOMIC set, forcing legacy DRM interface");
wlr_log(WLR_DEBUG,
"WLR_DRM_NO_ATOMIC set, forcing legacy DRM interface");
drm->iface = &legacy_iface;
} else if (drmSetClientCap(drm->fd, DRM_CLIENT_CAP_ATOMIC, 1)) {
wlr_log(WLR_DEBUG, "Atomic modesetting unsupported, using legacy DRM interface");
wlr_log(WLR_DEBUG,
"Atomic modesetting unsupported, using legacy DRM interface");
drm->iface = &legacy_iface;
} else {
wlr_log(WLR_DEBUG, "Using atomic DRM interface");
drm->iface = &atomic_iface;
}
int ret = drmGetCap(drm->fd, DRM_CAP_TIMESTAMP_MONOTONIC, &cap);
drm->clock = (ret == 0 && cap == 1) ? CLOCK_MONOTONIC : CLOCK_REALTIME;
return true;
}

2
include/backend/drm/drm.h
View file

@ -6,6 +6,7 @@
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <time.h>
#include <wayland-server.h>
#include <wayland-util.h>
#include <wlr/backend/drm.h>
@ -67,6 +68,7 @@ struct wlr_drm_backend {
struct wlr_drm_backend *parent;
const struct wlr_drm_interface *iface;
clockid_t clock;
int fd;

4
include/wlr/backend.h
View file

@ -62,5 +62,9 @@ struct wlr_renderer *wlr_backend_get_renderer(struct wlr_backend *backend);
* Might return NULL for backends that don't use a session.
*/
struct wlr_session *wlr_backend_get_session(struct wlr_backend *backend);
/**
* Returns the clock used by the backend for presentation feedback.
*/
clockid_t wlr_backend_get_present_clock(struct wlr_backend *backend);
#endif

2
include/wlr/backend/interface.h
View file

@ -10,6 +10,7 @@
#define WLR_BACKEND_INTERFACE_H
#include <stdbool.h>
#include <time.h>
#include <wlr/backend.h>
#include <wlr/render/egl.h>
@ -18,6 +19,7 @@ struct wlr_backend_impl {
void (*destroy)(struct wlr_backend *backend);
struct wlr_renderer *(*get_renderer)(struct wlr_backend *backend);
struct wlr_session *(*get_session)(struct wlr_backend *backend);
clockid_t (*get_present_clock)(struct wlr_backend *backend);
};
/**

6
types/wlr_output.c
View file

@ -18,8 +18,6 @@
#define OUTPUT_VERSION 3
#define DEFAULT_PRESENT_CLOCK CLOCK_MONOTONIC
static void output_send_to_resource(struct wl_resource *resource) {
struct wlr_output *output = wlr_output_from_resource(resource);
const uint32_t version = wl_resource_get_version(resource);
@ -268,6 +266,7 @@ void wlr_output_init(struct wlr_output *output, struct wlr_backend *backend,
wl_signal_init(&output->events.frame);
wl_signal_init(&output->events.needs_swap);
wl_signal_init(&output->events.swap_buffers);
wl_signal_init(&output->events.present);
wl_signal_init(&output->events.enable);
wl_signal_init(&output->events.mode);
wl_signal_init(&output->events.scale);
@ -566,7 +565,8 @@ void wlr_output_send_present(struct wlr_output *output, struct timespec *when,
unsigned seq, uint32_t flags) {
struct timespec now;
if (when == NULL) {
if (!clock_gettime(DEFAULT_PRESENT_CLOCK, &now)) {
clockid_t clock = wlr_backend_get_present_clock(output->backend);
if (!clock_gettime(clock, &now)) {
wlr_log_errno(WLR_ERROR, "failed to send output present event: "
"failed to read clock");
return;