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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifdef MOZ_WAYLAND
# include "WaylandVsyncSource.h"
# include "nsThreadUtils.h"
# include "nsISupportsImpl.h"
# include "MainThreadUtils.h"
# include <gdk/gdkwayland.h>
using namespace mozilla::widget;
namespace mozilla {
static void WaylandVsyncSourceCallbackHandler(void* data,
struct wl_callback* callback,
uint32_t time) {
WaylandVsyncSource::WaylandDisplay* context =
(WaylandVsyncSource::WaylandDisplay*)data;
wl_callback_destroy(callback);
context->FrameCallback(time);
}
static const struct wl_callback_listener WaylandVsyncSourceCallbackListener = {
WaylandVsyncSourceCallbackHandler};
WaylandVsyncSource::WaylandDisplay::WaylandDisplay(MozContainer* container)
: mEnabledLock("WaylandVsyncEnabledLock"),
mIsShutdown(false),
mVsyncEnabled(false),
mMonitorEnabled(false),
mCallback(nullptr),
mContainer(container),
mLastVsyncTimeStamp(TimeStamp::Now()) {
MOZ_ASSERT(NS_IsMainThread());
// We store the display here so all the frame callbacks won't have to look it
// up all the time.
mDisplay = WaylandDisplayGetWLDisplay();
mVsyncRate = TimeDuration::FromMilliseconds(1000.0 / 60.0);
}
void WaylandVsyncSource::WaylandDisplay::ClearFrameCallback() {
if (mCallback) {
wl_callback_destroy(mCallback);
mCallback = nullptr;
}
}
void WaylandVsyncSource::WaylandDisplay::Refresh() {
TimeStamp outputTimestamp;
{
MutexAutoLock lock(mEnabledLock);
if (!mMonitorEnabled || !mVsyncEnabled || mCallback) {
// We don't need to do anything because:
// * We are unwanted by our widget or monitor, or
// * The last frame callback hasn't yet run to see that it had been shut
// down, so we can reuse it after having set mVsyncEnabled to true.
return;
}
struct wl_surface* surface = moz_container_wayland_surface_lock(mContainer);
if (!surface) {
// The surface hasn't been created yet. Try again when the surface is
// ready.
RefPtr<WaylandVsyncSource::WaylandDisplay> self(this);
moz_container_wayland_add_initial_draw_callback(
mContainer, [self]() -> void { self->Refresh(); });
return;
}
moz_container_wayland_surface_unlock(mContainer, &surface);
// Vsync is enabled, but we don't have a callback configured. Set one up so
// we can get to work.
SetupFrameCallback();
mLastVsyncTimeStamp = TimeStamp::Now();
outputTimestamp = mLastVsyncTimeStamp + GetVsyncRate();
}
NotifyVsync(mLastVsyncTimeStamp, outputTimestamp);
}
void WaylandVsyncSource::WaylandDisplay::EnableMonitor() {
{
MutexAutoLock lock(mEnabledLock);
if (mMonitorEnabled) {
return;
}
mMonitorEnabled = true;
}
Refresh();
}
void WaylandVsyncSource::WaylandDisplay::DisableMonitor() {
MutexAutoLock lock(mEnabledLock);
if (!mMonitorEnabled) {
return;
}
mMonitorEnabled = false;
ClearFrameCallback();
}
void WaylandVsyncSource::WaylandDisplay::SetupFrameCallback() {
MOZ_ASSERT(mCallback == nullptr);
struct wl_surface* surface = moz_container_wayland_surface_lock(mContainer);
if (!surface) {
// We don't have a surface, either due to being called before it was made
// available in the mozcontainer, or after it was destroyed. We're all done
// regardless.
ClearFrameCallback();
return;
}
mCallback = wl_surface_frame(surface);
wl_callback_add_listener(mCallback, &WaylandVsyncSourceCallbackListener,
this);
wl_surface_commit(surface);
wl_display_flush(mDisplay);
moz_container_wayland_surface_unlock(mContainer, &surface);
}
void WaylandVsyncSource::WaylandDisplay::FrameCallback(uint32_t timestampTime) {
TimeStamp outputTimestamp;
{
MutexAutoLock lock(mEnabledLock);
mCallback = nullptr;
if (!mVsyncEnabled || !mMonitorEnabled) {
// We are unwanted by either our creator or our consumer, so we just stop
// here without setting up a new frame callback.
return;
}
// Configure our next frame callback.
SetupFrameCallback();
int64_t tick =
BaseTimeDurationPlatformUtils::TicksFromMilliseconds(timestampTime);
TimeStamp callbackTimeStamp = TimeStamp::FromSystemTime(tick);
double duration = (TimeStamp::Now() - callbackTimeStamp).ToMilliseconds();
TimeStamp vsyncTimestamp;
if (duration < 50 && duration > -50) {
vsyncTimestamp = callbackTimeStamp;
} else {
vsyncTimestamp = TimeStamp::Now();
}
CalculateVsyncRate(vsyncTimestamp);
mLastVsyncTimeStamp = vsyncTimestamp;
outputTimestamp = vsyncTimestamp + GetVsyncRate();
}
NotifyVsync(mLastVsyncTimeStamp, outputTimestamp);
}
TimeDuration WaylandVsyncSource::WaylandDisplay::GetVsyncRate() {
return mVsyncRate;
}
void WaylandVsyncSource::WaylandDisplay::CalculateVsyncRate(
TimeStamp vsyncTimestamp) {
double duration = (vsyncTimestamp - mLastVsyncTimeStamp).ToMilliseconds();
double curVsyncRate = mVsyncRate.ToMilliseconds();
double correction;
if (duration > curVsyncRate) {
correction = fmin(curVsyncRate, (duration - curVsyncRate) / 10);
mVsyncRate += TimeDuration::FromMilliseconds(correction);
} else {
correction = fmin(curVsyncRate / 2, (curVsyncRate - duration) / 10);
mVsyncRate -= TimeDuration::FromMilliseconds(correction);
}
}
void WaylandVsyncSource::WaylandDisplay::EnableVsync() {
MOZ_ASSERT(NS_IsMainThread());
{
MutexAutoLock lock(mEnabledLock);
if (mVsyncEnabled || mIsShutdown) {
return;
}
mVsyncEnabled = true;
}
Refresh();
}
void WaylandVsyncSource::WaylandDisplay::DisableVsync() {
MutexAutoLock lock(mEnabledLock);
mVsyncEnabled = false;
ClearFrameCallback();
}
bool WaylandVsyncSource::WaylandDisplay::IsVsyncEnabled() {
MutexAutoLock lock(mEnabledLock);
return mVsyncEnabled;
}
void WaylandVsyncSource::WaylandDisplay::Shutdown() {
MOZ_ASSERT(NS_IsMainThread());
MutexAutoLock lock(mEnabledLock);
mIsShutdown = true;
mVsyncEnabled = false;
ClearFrameCallback();
wl_display_roundtrip(mDisplay);
}
} // namespace mozilla
#endif // MOZ_WAYLAND
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