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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_dxgi.h"
#include "base/logging.h"
#include "base/trace_event/typed_macros.h"
#include "base/win/windows_version.h"
#include "ui/gl/gl_features.h"
namespace gl {
namespace {
// Check if a DXGI adapter is stale and needs to be replaced. This can happen
// e.g. when detaching/reattaching remote desktop sessions and causes subsequent
// WaitForVSyncs on the stale adapter/output to return instantly.
bool DXGIFactoryIsCurrent(IDXGIAdapter* dxgi_adapter) {
CHECK(dxgi_adapter);
HRESULT hr = S_OK;
Microsoft::WRL::ComPtr<IDXGIFactory1> dxgi_factory;
hr = dxgi_adapter->GetParent(IID_PPV_ARGS(&dxgi_factory));
CHECK_EQ(S_OK, hr);
return dxgi_factory->IsCurrent();
}
// Create a new factory and find a DXGI adapter matching a LUID. This is useful
// if we have a previous adapter whose factory has become stale.
Microsoft::WRL::ComPtr<IDXGIAdapter> FindDXGIAdapterOnNewFactory(
const LUID luid) {
HRESULT hr = S_OK;
Microsoft::WRL::ComPtr<IDXGIFactory1> factory;
hr = CreateDXGIFactory1(IID_PPV_ARGS(&factory));
CHECK_EQ(S_OK, hr);
Microsoft::WRL::ComPtr<IDXGIAdapter1> new_adapter;
for (uint32_t i = 0;; i++) {
hr = factory->EnumAdapters1(i, &new_adapter);
if (hr == DXGI_ERROR_NOT_FOUND) {
break;
}
if (FAILED(hr)) {
DLOG(ERROR) << "EnumAdapters1 failed: "
<< logging::SystemErrorCodeToString(hr);
return nullptr;
}
DXGI_ADAPTER_DESC1 new_adapter_desc;
hr = new_adapter->GetDesc1(&new_adapter_desc);
CHECK_EQ(S_OK, hr);
if (new_adapter_desc.AdapterLuid.HighPart == luid.HighPart &&
new_adapter_desc.AdapterLuid.LowPart == luid.LowPart) {
return new_adapter;
}
}
DLOG(ERROR) << "Failed to find DXGI adapter with matching LUID";
return nullptr;
}
// Return true if |output| is on |monitor|.
bool DXGIOutputIsOnMonitor(IDXGIOutput* output, const HMONITOR monitor) {
CHECK(output);
DXGI_OUTPUT_DESC desc = {};
HRESULT hr = output->GetDesc(&desc);
CHECK_EQ(S_OK, hr);
return desc.Monitor == monitor;
}
Microsoft::WRL::ComPtr<IDXGIOutput> DXGIOutputFromMonitor(
HMONITOR monitor,
IDXGIAdapter* dxgi_adapter) {
CHECK(dxgi_adapter);
HRESULT hr = S_OK;
Microsoft::WRL::ComPtr<IDXGIOutput> output;
for (uint32_t i = 0;; i++) {
hr = dxgi_adapter->EnumOutputs(i, &output);
if (hr == DXGI_ERROR_NOT_FOUND) {
break;
}
if (FAILED(hr)) {
DLOG(ERROR) << "EnumOutputs failed: "
<< logging::SystemErrorCodeToString(hr);
return nullptr;
}
if (DXGIOutputIsOnMonitor(output.Get(), monitor)) {
return output;
}
}
DLOG(ERROR) << "Failed to find DXGI output with matching monitor";
return nullptr;
}
Microsoft::WRL::ComPtr<IDXGIAdapter> GetAdapter(IDXGIDevice* device) {
CHECK(device);
Microsoft::WRL::ComPtr<IDXGIAdapter> adapter;
CHECK_EQ(S_OK, device->GetAdapter(&adapter));
return adapter;
}
LUID GetLuid(IDXGIAdapter* adapter) {
CHECK(adapter);
DXGI_ADAPTER_DESC desc;
HRESULT hr = adapter->GetDesc(&desc);
CHECK_EQ(S_OK, hr);
return desc.AdapterLuid;
}
} // namespace
VSyncThreadWinDXGI::VSyncThreadWinDXGI(
Microsoft::WRL::ComPtr<IDXGIDevice> dxgi_device)
: VSyncThreadWin(),
vsync_provider_(gfx::kNullAcceleratedWidget),
dxgi_adapter_(GetAdapter(dxgi_device.Get())),
original_adapter_luid_(GetLuid(dxgi_adapter_.Get())) {}
VSyncThreadWinDXGI::~VSyncThreadWinDXGI() {
NOTREACHED();
}
gfx::VSyncProvider* VSyncThreadWinDXGI::vsync_provider() {
return &vsync_provider_;
}
base::TimeDelta VSyncThreadWinDXGI::GetVsyncInterval() {
base::TimeTicks vsync_timebase;
base::TimeDelta vsync_interval;
// This is a simplified initial approach to fix crbug.com/1456399
// In Windows SV3 builds DWM will operate with per monitor refresh
// rates. As a result of this, DwmGetCompositionTimingInfo is no longer
// guaranteed to align with the primary monitor but will instead align
// with the current highest refresh rate monitor. This can cause issues
// in clients which may be waiting on the primary monitor's vblank as
// the reported interval may no longer match with the vblank wait.
// To work around this discrepancy get the VSync interval directly from
// monitor associated with window_ or the primary monitor.
static bool use_sv3_workaround =
base::win::GetVersion() > base::win::Version::WIN11_22H2 &&
base::FeatureList::IsEnabled(
features::kUsePrimaryMonitorVSyncIntervalOnSV3);
const bool get_vsync_params_succeeded =
use_sv3_workaround
? vsync_provider_.GetVSyncIntervalIfAvailable(&vsync_interval)
: vsync_provider_.GetVSyncParametersIfAvailable(&vsync_timebase,
&vsync_interval);
DCHECK(get_vsync_params_succeeded);
return vsync_interval;
}
bool VSyncThreadWinDXGI::WaitForVSyncImpl(base::TimeDelta* vsync_interval) {
*vsync_interval = GetVsyncInterval();
if (!dxgi_adapter_ || !DXGIFactoryIsCurrent(dxgi_adapter_.Get())) {
TRACE_EVENT("gpu", "DXGIFactoryIsCurrent non-current factory");
dxgi_adapter_ = FindDXGIAdapterOnNewFactory(original_adapter_luid_);
primary_output_.Reset();
}
// From Raymond Chen's blog "How do I get a handle to the primary monitor?"
// https://devblogs.microsoft.com/oldnewthing/20141106-00/?p=43683
const HMONITOR monitor = MonitorFromWindow(nullptr, MONITOR_DEFAULTTOPRIMARY);
if (primary_output_ &&
!DXGIOutputIsOnMonitor(primary_output_.Get(), monitor)) {
TRACE_EVENT("gpu", "DXGIOutputIsOnMonitor primary monitor changed");
primary_output_.Reset();
}
if (!primary_output_ && dxgi_adapter_) {
primary_output_ = DXGIOutputFromMonitor(monitor, dxgi_adapter_.Get());
}
// WaitForVBlank returns success on desktop occlusion and returns early
const bool wait_succeeded =
primary_output_ && SUCCEEDED(primary_output_->WaitForVBlank());
if (!wait_succeeded) {
TRACE_EVENT2("gpu", "WaitForVSyncImpl", "has adapter", !!dxgi_adapter_,
"has output", !!primary_output_);
return false;
}
return true;
}
} // namespace gl
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