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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gl/vsync_thread_win_dcomp.h"
#include "base/logging.h"
#include "base/trace_event/typed_macros.h"
#include "ui/gl/direct_composition_support.h"
#include "ui/gl/gl_features.h"
namespace gl {
VSyncThreadWinDComp::VSyncThreadWinDComp()
: VSyncThreadWin(), vsync_provider_() {}
VSyncThreadWinDComp::~VSyncThreadWinDComp() = default;
base::TimeDelta VSyncThreadWinDComp::GetVsyncInterval() {
base::TimeTicks vsync_timebase;
base::TimeDelta vsync_interval;
// Use the compositor clock to determine vsync interval, disabled by default
const bool get_vsync_succeeded =
vsync_provider_.GetVSyncParametersIfAvailable(&vsync_timebase,
&vsync_interval);
DCHECK(get_vsync_succeeded);
return vsync_interval;
}
gfx::VSyncProvider* VSyncThreadWinDComp::vsync_provider() {
return &vsync_provider_;
}
bool VSyncThreadWinDComp::WaitForVSyncImpl(base::TimeDelta* vsync_interval) {
*vsync_interval = GetVsyncInterval();
// Using INFINITE timeout as it is expected for the wait to return in a
// timely manner - either at the next vblank or immediately due to desktop
// occlusion. This behavior matches the DXGI case.
// DCompositionWaitForCompositorClock returns an error on desktop occlusion
// and returns early.
DWORD wait_result =
gl::DCompositionWaitForCompositorClock(0, nullptr, INFINITE);
if (wait_result != WAIT_OBJECT_0) {
TRACE_EVENT1("gpu", "WaitForVSyncImpl", "wait result", wait_result);
return false;
}
return true;
}
} // namespace gl
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