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perf: 优化渲染延迟

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刘旭 2023-06-20 00:34:13 +08:00
commit 0b43a42197
2 changed files with 41 additions and 13 deletions
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44
src/Magpie.Core/Renderer.cpp
View file

@ -45,6 +45,19 @@ bool Renderer::Initialize(HWND hwndSrc, HWND hwndScaling, const ScalingOptions&
return false;
}
HRESULT hr = _frontendResources.GetD3DDevice()->CreateFence(
_frontendFenceValue, D3D11_FENCE_FLAG_NONE, IID_PPV_ARGS(&_frontendD3dFence));
if (FAILED(hr)) {
Logger::Get().ComError("CreateFence 失败", hr);
return false;
}
_frontendFenceEvent.reset(Win32Utils::SafeHandle(CreateEvent(nullptr, FALSE, FALSE, nullptr)));
if (!_frontendFenceEvent) {
Logger::Get().Win32Error("CreateEvent 失败");
return false;
}
// 等待后端初始化完成
while (true) {
{
@ -58,7 +71,7 @@ bool Renderer::Initialize(HWND hwndSrc, HWND hwndScaling, const ScalingOptions&
}
// 获取共享纹理
HRESULT hr = _frontendResources.GetD3DDevice()->OpenSharedResource(
hr = _frontendResources.GetD3DDevice()->OpenSharedResource(
_sharedTextureHandle, IID_PPV_ARGS(_frontendSharedTexture.put()));
if (FAILED(hr)) {
Logger::Get().ComError("OpenSharedResource 失败", hr);
@ -244,6 +257,18 @@ void Renderer::Render(HCURSOR hCursor, POINT cursorPos) noexcept {
// 丢弃渲染目标的内容。仅当现有内容将被完全覆盖时，此操作才有效
d3dDC->DiscardView(backBufferRtv);
hr = d3dDC->Signal(_frontendD3dFence.get(), ++_frontendFenceValue);
if (FAILED(hr)) {
return;
}
hr = _frontendD3dFence->SetEventOnCompletion(_frontendFenceValue, _frontendFenceEvent.get());
if (FAILED(hr)) {
return;
}
// 等待渲染完成以最大程度的降低延迟。前端渲染非常廉价，相比性能我们更关心延迟
WaitForSingleObject(_frontendFenceEvent.get(), INFINITE);
}
bool Renderer::_InitFrameSource(const ScalingOptions& options) noexcept {
@ -471,14 +496,14 @@ void Renderer::_BackendThreadProc(const ScalingOptions& options) noexcept {
}
HRESULT hr = _backendResources.GetD3DDevice()->CreateFence(
_fenceValue, D3D11_FENCE_FLAG_NONE, IID_PPV_ARGS(&_d3dFence));
_backendFenceValue, D3D11_FENCE_FLAG_NONE, IID_PPV_ARGS(&_backendD3dFence));
if (FAILED(hr)) {
Logger::Get().ComError("CreateFence 失败", hr);
return;
}
_fenceEvent.reset(Win32Utils::SafeHandle(CreateEvent(nullptr, FALSE, FALSE, nullptr)));
if (!_fenceEvent) {
_backendFenceEvent.reset(Win32Utils::SafeHandle(CreateEvent(nullptr, FALSE, FALSE, nullptr)));
if (!_backendFenceEvent) {
Logger::Get().Win32Error("CreateEvent 失败");
return;
}
@ -535,11 +560,11 @@ void Renderer::_BackendRender(ID3D11Texture2D* effectsOutput) noexcept {
effectDrawer.Draw();
}
HRESULT hr = d3dDC->Signal(_d3dFence.get(), ++_fenceValue);
HRESULT hr = d3dDC->Signal(_backendD3dFence.get(), ++_backendFenceValue);
if (FAILED(hr)) {
return;
}
hr = _d3dFence->SetEventOnCompletion(_fenceValue, _fenceEvent.get());
hr = _backendD3dFence->SetEventOnCompletion(_backendFenceValue, _backendFenceEvent.get());
if (FAILED(hr)) {
return;
}
@ -547,7 +572,7 @@ void Renderer::_BackendRender(ID3D11Texture2D* effectsOutput) noexcept {
d3dDC->Flush();
// 等待渲染完成
WaitForSingleObject(_fenceEvent.get(), INFINITE);
WaitForSingleObject(_backendFenceEvent.get(), INFINITE);
// 渲染完成后再更新 _sharedTextureMutexKey，否则前端必须等待，会大幅降低帧率
const uint64_t key = ++_sharedTextureMutexKey;
@ -560,10 +585,9 @@ void Renderer::_BackendRender(ID3D11Texture2D* effectsOutput) noexcept {
_backendSharedTextureMutex->ReleaseSync(key);
// 根据 https://learn.microsoft.com/en-us/windows/win32/api/d3d11/nf-d3d11-id3d11device-opensharedresource，
// 更新共享纹理后必须调用 Flush
d3dDC->Flush();
// 唤醒前端线程
PostMessage(_hwndScaling, WM_NULL, 0, 0);
}
}

10
src/Magpie.Core/Renderer.h
View file

@ -57,6 +57,10 @@ private:
HCURSOR _lastCursorHandle = NULL;
POINT _lastCursorPos{ std::numeric_limits<LONG>::max(), std::numeric_limits<LONG>::max() };
winrt::com_ptr<ID3D11Fence> _frontendD3dFence;
uint64_t _frontendFenceValue = 0;
Win32Utils::ScopedHandle _frontendFenceEvent;
winrt::com_ptr<ID3D11Texture2D> _frontendSharedTexture;
winrt::com_ptr<IDXGIKeyedMutex> _frontendSharedTextureMutex;
RECT _destRect{};
@ -70,9 +74,9 @@ private:
StepTimer _stepTimer;
winrt::com_ptr<ID3D11Fence> _d3dFence;
uint64_t _fenceValue = 0;
Win32Utils::ScopedHandle _fenceEvent;
winrt::com_ptr<ID3D11Fence> _backendD3dFence;
uint64_t _backendFenceValue = 0;
Win32Utils::ScopedHandle _backendFenceEvent;
winrt::com_ptr<ID3D11Texture2D> _backendSharedTexture;
winrt::com_ptr<IDXGIKeyedMutex> _backendSharedTextureMutex;