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Fix blocking presents in borderless windowed flip modes

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This commit is contained in:
Cameron Gutman 2022-04-15 23:21:52 -05:00
parent 62136a1a96
commit fd563726f0
1 changed files with 15 additions and 20 deletions
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35
app/streaming/video/ffmpeg-renderers/dxva2.cpp
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@ -602,20 +602,10 @@ bool DXVA2Renderer::initializeDevice(SDL_Window* window, bool enableVsync)
// to reduce latency by avoiding double v-syncing.
d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
// If V-sync is enabled (not rendering faster than display),
// we can use FlipEx for more efficient swapping.
if (enableVsync) {
// D3DSWAPEFFECT_FLIPEX requires at least 2 back buffers to allow us to
// continue while DWM is waiting to render the surface to the display.
d3dpp.SwapEffect = D3DSWAPEFFECT_FLIPEX;
d3dpp.BackBufferCount = 2;
}
else {
// With V-sync off, we won't use FlipEx because that will block while
// DWM is waiting to render our surface (effectively behaving like V-Sync).
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.BackBufferCount = 1;
}
// D3DSWAPEFFECT_FLIPEX requires at least 2 back buffers to allow us to
// continue while DWM is waiting to render the surface to the display.
d3dpp.SwapEffect = D3DSWAPEFFECT_FLIPEX;
d3dpp.BackBufferCount = 2;
m_BlockingPresent = false;
@ -679,12 +669,17 @@ bool DXVA2Renderer::initializeDevice(SDL_Window* window, bool enableVsync)
return false;
}
hr = m_Device->SetMaximumFrameLatency(1);
if (FAILED(hr)) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"SetMaximumFrameLatency() failed: %x",
hr);
return false;
// We must not call this for flip swapchains. It will counterintuitively
// increase latency by forcing our Present() to block on DWM even when
// using D3DPRESENT_INTERVAL_IMMEDIATE.
if (d3dpp.SwapEffect != D3DSWAPEFFECT_FLIPEX) {
hr = m_Device->SetMaximumFrameLatency(1);
if (FAILED(hr)) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"SetMaximumFrameLatency() failed: %x",
hr);
return false;
}
}
return true;