Mirrors/moonlight-qt
2
0
Fork 0
mirror of https://github.com/moonlight-stream/moonlight-qt synced 2024-12-14 21:32:27 +00:00
Code Issues Projects Releases Packages Wiki Activity

Cleanup D3D11VA renderer by removing unnecessary codepaths

Browse source 
Waitable swapchains seem to be worse than our existing DXVsyncSource for synchronizing with VBlank.

Full-screen exclusive mode isn't beneficial vs Independent Flip on modern Win10/Win11 systems.
This commit is contained in:
Cameron Gutman 2022-04-15 23:26:32 -05:00
parent fd563726f0
commit 747d3eedf1
2 changed files with 30 additions and 148 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

175
app/streaming/video/ffmpeg-renderers/d3d11va.cpp
View file

@ -80,7 +80,6 @@ D3D11VARenderer::D3D11VARenderer()
m_LastColorSpace(AVCOL_SPC_UNSPECIFIED),
m_LastColorRange(AVCOL_RANGE_UNSPECIFIED),
m_AllowTearing(false),
m_FrameWaitableObject(nullptr),
m_VideoGenericPixelShader(nullptr),
m_VideoBt601LimPixelShader(nullptr),
m_VideoBt2020LimPixelShader(nullptr),
@ -127,15 +126,6 @@ D3D11VARenderer::~D3D11VARenderer()
SAFE_COM_RELEASE(m_OverlayPixelShader);
SAFE_COM_RELEASE(m_RenderTargetView);
if (m_FrameWaitableObject != nullptr) {
CloseHandle(m_FrameWaitableObject);
}
if (m_SwapChain != nullptr && !m_Windowed) {
// It's illegal to destroy a full-screen swapchain. Make sure we're in windowed mode.
m_SwapChain->SetFullscreenState(FALSE, nullptr);
}
SAFE_COM_RELEASE(m_SwapChain);
if (m_HwFramesContext != nullptr) {
@ -224,20 +214,13 @@ bool D3D11VARenderer::initialize(PDECODER_PARAMETERS params)
adapter->Release();
adapter = nullptr;
#if 0
m_Windowed = (SDL_GetWindowFlags(params->window) & SDL_WINDOW_FULLSCREEN_DESKTOP) != SDL_WINDOW_FULLSCREEN;
#else
// Always use windowed or borderless windowed mode for now. SDL does mode-setting for us
// in full-screen exclusive mode, so this actually works out okay.
m_Windowed = true;
#endif
DXGI_SWAP_CHAIN_DESC1 swapChainDesc = {};
swapChainDesc.Stereo = FALSE;
swapChainDesc.SampleDesc.Count = 1;
swapChainDesc.SampleDesc.Quality = 0;
swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
swapChainDesc.Scaling = DXGI_SCALING_STRETCH;
swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
swapChainDesc.AlphaMode = DXGI_ALPHA_MODE_UNSPECIFIED;
swapChainDesc.Flags = 0;
@ -247,42 +230,20 @@ bool D3D11VARenderer::initialize(PDECODER_PARAMETERS params)
//
// Even though we allocate 3 front buffers for pre-rendered frames,
// they won't actually increase presentation latency because we
// always use SyncInterval 0 which replaces the last one. See
// the SetMaximumFrameLatency comment below for more details.
// always use SyncInterval 0 which replaces the last one.
//
// IDXGIDevice1 has a SetMaximumFrameLatency() function, but counter-
// intuitively we must avoid it to reduce latency. If we set our max
// frame latency to 1 on thedevice, our SyncInterval 0 Present() calls
// will block on DWM (acting like SyncInterval 1) rather than doing
// the non-blocking present we expect.
//
// NB: 3 total buffers seems sufficient on NVIDIA hardware but
// causes performance issues (buffer starvation) on AMD GPUs.
swapChainDesc.BufferCount = 3 + 1 + 1;
DXGI_SWAP_CHAIN_FULLSCREEN_DESC fullScreenDesc = {};
if (m_Windowed) {
// Use the current window size as the swapchain size
SDL_GetWindowSize(params->window, (int*)&swapChainDesc.Width, (int*)&swapChainDesc.Height);
}
else {
// Use the current display mode as the swapchain size
SDL_DisplayMode sdlMode;
if (SDL_GetWindowDisplayMode(params->window, &sdlMode) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"SDL_GetWindowDisplayMode() failed: %s",
SDL_GetError());
return false;
}
swapChainDesc.Width = sdlMode.w;
swapChainDesc.Height = sdlMode.h;
// Leave these unspecified to ensure we don't end up in an inefficient "proxy"
// full-screen swapchain with DXGI doing format conversion behind our backs.
// https://youtu.be/E3wTajGZOsA?t=1489
fullScreenDesc.RefreshRate.Numerator = 0;
fullScreenDesc.RefreshRate.Denominator = 0;
fullScreenDesc.Scaling = DXGI_MODE_SCALING_UNSPECIFIED;
fullScreenDesc.ScanlineOrdering = DXGI_MODE_SCANLINE_ORDER_UNSPECIFIED;
fullScreenDesc.Windowed = FALSE;
}
// Use the current window size as the swapchain size
SDL_GetWindowSize(params->window, (int*)&swapChainDesc.Width, (int*)&swapChainDesc.Height);
m_DisplayWidth = swapChainDesc.Width;
m_DisplayHeight = swapChainDesc.Height;
@ -294,41 +255,21 @@ bool D3D11VARenderer::initialize(PDECODER_PARAMETERS params)
swapChainDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
}
// Use DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING with flip mode for non-vsync case, if possible
// Use DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING with flip mode for non-vsync case, if possible.
// NOTE: This is only possible in windowed or borderless windowed mode.
if (!params->enableVsync) {
// DXGI_PRESENT_ALLOW_TEARING may only be used in windowed mode
if (m_Windowed) {
BOOL allowTearing = FALSE;
hr = m_Factory->CheckFeatureSupport(DXGI_FEATURE_PRESENT_ALLOW_TEARING,
&allowTearing,
sizeof(allowTearing));
if (SUCCEEDED(hr)) {
// Use flip discard with allow tearing mode if possible.
swapChainDesc.Flags |= DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING;
swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
m_AllowTearing = true;
}
else {
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
"GPU driver doesn't support DXGI_FEATURE_PRESENT_ALLOW_TEARING");
// Without tearing support, we'll have to use regular discard mode to get tearing
swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
}
BOOL allowTearing = FALSE;
hr = m_Factory->CheckFeatureSupport(DXGI_FEATURE_PRESENT_ALLOW_TEARING,
&allowTearing,
sizeof(allowTearing));
if (SUCCEEDED(hr)) {
// Use flip discard with allow tearing mode if possible.
swapChainDesc.Flags |= DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING;
m_AllowTearing = true;
}
else {
// In full-screen exclusive mode, we'll have to use regular discard mode
swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
}
}
else {
// In V-sync mode, we can always use flip discard
swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
// We'll use a waitable swapchain to pace frame delivery
// NB: We can only use this option in windowed mode (or borderless fullscreen).
if (m_Windowed && params->enableFramePacing) {
swapChainDesc.Flags |= DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT;
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"GPU driver doesn't support DXGI_FEATURE_PRESENT_ALLOW_TEARING");
}
}
@ -337,11 +278,13 @@ bool D3D11VARenderer::initialize(PDECODER_PARAMETERS params)
SDL_GetWindowWMInfo(params->window, &info);
SDL_assert(info.subsystem == SDL_SYSWM_WINDOWS);
// Always use windowed or borderless windowed mode.. SDL does mode-setting for us in
// full-screen exclusive mode (SDL_WINDOW_FULLSCREEN), so this actually works out okay.
IDXGISwapChain1* swapChain;
hr = m_Factory->CreateSwapChainForHwnd(m_Device,
info.info.win.window,
&swapChainDesc,
m_Windowed ? nullptr : &fullScreenDesc,
nullptr,
nullptr,
&swapChain);
@ -449,29 +392,6 @@ bool D3D11VARenderer::initialize(PDECODER_PARAMETERS params)
}
}
// We have to set the maximum frame latency on waitable swapchains.
//
// NB: IDXGIDevice1 has a SetMaximumFrameLatency() function, but counterintuitively
// we must avoid it to reduce latency. If we set our max frame latency to 1 on the
// device, our SyncInterval 0 Present() calls will block on DWM (acting like
// SyncInterval 1) rather than doing the non-blocking present we expect.
if (swapChainDesc.Flags & DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT) {
SDL_assert(params->enableVsync);
SDL_assert(m_Windowed);
// We only want one buffered frame on our waitable swapchain to pace properly
hr = m_SwapChain->SetMaximumFrameLatency(1);
if (FAILED(hr)) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"IDXGISwapChain::SetMaximumFrameLatency() failed: %x",
hr);
return false;
}
m_FrameWaitableObject = m_SwapChain->GetFrameLatencyWaitableObject();
SDL_assert(m_FrameWaitableObject != nullptr);
}
return true;
}
@ -560,23 +480,6 @@ void D3D11VARenderer::setHdrMode(bool enabled)
unlockContext(this);
}
void D3D11VARenderer::waitToRender()
{
if (m_FrameWaitableObject != nullptr) {
SDL_assert(m_Windowed);
SDL_assert(m_DecoderParams.enableVsync);
SDL_assert(m_DecoderParams.enableFramePacing);
// Wait for the pipeline to be ready for the next frame in pacing mode.
//
// This callback happens before selecting the next frame to render, so
// we can wait for the previous frame to finish prior to picking the
// next one to display. This reduces the effective display latency
// by ensuring we always render the most recent frame immediately.
WaitForSingleObjectEx(m_FrameWaitableObject, 500, FALSE);
}
}
void D3D11VARenderer::renderFrame(AVFrame* frame)
{
// Acquire the context lock for rendering to prevent concurrent
@ -603,33 +506,15 @@ void D3D11VARenderer::renderFrame(AVFrame* frame)
if (m_AllowTearing) {
SDL_assert(!m_DecoderParams.enableVsync);
SDL_assert(m_Windowed);
// If tearing is allowed, use DXGI_PRESENT_ALLOW_TEARING with syncInterval 0.
// It is not valid to use any other syncInterval values in tearing mode.
flags = DXGI_PRESENT_ALLOW_TEARING;
}
else if (!m_DecoderParams.enableVsync) {
// In any other non-vsync mode, just render with syncInterval 0.
// We'll probably have a non-flip swapchain here.
flags = 0;
}
else if (m_FrameWaitableObject != nullptr) {
SDL_assert(m_Windowed);
SDL_assert(m_DecoderParams.enableVsync);
SDL_assert(m_DecoderParams.enableFramePacing);
// With frame pacing, we'll have a waitable swapchain, so we can
// use syncInterval 0 and the wait will sync us with VBlank.
flags = 0;
}
else {
SDL_assert(m_DecoderParams.enableVsync);
SDL_assert(!m_DecoderParams.enableFramePacing);
SDL_assert(m_FrameWaitableObject == nullptr);
// With vsync enabled but frame pacing disabled, we'll submit as
// fast as possible and DWM will discard excess frames for us.
// Otherwise, we'll submit as fast as possible and DWM will discard excess
// frames for us. If frame pacing is also enabled, our Vsync source will keep
// us in sync with VBlank.
flags = 0;
}
@ -1046,8 +931,8 @@ bool D3D11VARenderer::checkDecoderSupport(IDXGIAdapter* adapter)
int D3D11VARenderer::getRendererAttributes()
{
// This renderer supports HDR and can frame pace with waitToRender()
return RENDERER_ATTRIBUTE_HDR_SUPPORT | RENDERER_ATTRIBUTE_SELF_PACING;
// This renderer supports HDR
return RENDERER_ATTRIBUTE_HDR_SUPPORT;
}
void D3D11VARenderer::lockContext(void *lock_ctx)

3
app/streaming/video/ffmpeg-renderers/d3d11va.h
View file

@ -19,7 +19,6 @@ public:
virtual bool prepareDecoderContext(AVCodecContext* context, AVDictionary**) override;
virtual bool prepareDecoderContextInGetFormat(AVCodecContext* context, AVPixelFormat pixelFormat) override;
virtual void renderFrame(AVFrame* frame) override;
virtual void waitToRender() override;
virtual void notifyOverlayUpdated(Overlay::OverlayType) override;
virtual void setHdrMode(bool enabled) override;
virtual int getRendererAttributes() override;
@ -46,12 +45,10 @@ private:
int m_TextureAlignment;
int m_DisplayWidth;
int m_DisplayHeight;
bool m_Windowed;
AVColorSpace m_LastColorSpace;
AVColorRange m_LastColorRange;
bool m_AllowTearing;
HANDLE m_FrameWaitableObject;
ID3D11PixelShader* m_VideoGenericPixelShader;
ID3D11PixelShader* m_VideoBt601LimPixelShader;