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Fix FlipEx on Windows 7

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This commit is contained in:
Cameron Gutman 2018-08-21 00:49:29 -07:00
parent 0fa0ab43c9
commit 7d9478b774
1 changed files with 6 additions and 17 deletions
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21
app/streaming/video/ffmpeg-renderers/dxva2.cpp
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@ -460,7 +460,6 @@ bool DXVA2Renderer::initializeDevice(SDL_Window* window, bool enableVsync)
D3DPRESENT_PARAMETERS d3dpp = {}; D3DPRESENT_PARAMETERS d3dpp = {};
d3dpp.hDeviceWindow = info.info.win.window; d3dpp.hDeviceWindow = info.info.win.window;
d3dpp.BackBufferCount = 1;
d3dpp.Flags = D3DPRESENTFLAG_VIDEO; d3dpp.Flags = D3DPRESENTFLAG_VIDEO;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
@ -485,22 +484,10 @@ bool DXVA2Renderer::initializeDevice(SDL_Window* window, bool enableVsync)
// to reduce latency by avoiding double v-syncing. // to reduce latency by avoiding double v-syncing.
d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE; d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
// On Windows 7, DWM seems to have a nasty bug where using // D3DSWAPEFFECT_FLIPEX requires at least 2 back buffers to allow us to
// FlipEx causes rendering to be locked to 30 FPS. I'm not // continue while DWM is waiting to render the surface to the display.
// sure if Windows 8 is affected, but I confirmed Windows 8.1
// is not. I'm erring on the side of caution and assuming
// Windows 8 is affected.
if (IsWindows8Point1OrGreater()) {
// Use FlipEx mode if DWM is running to increase efficiency
d3dpp.SwapEffect = D3DSWAPEFFECT_FLIPEX; d3dpp.SwapEffect = D3DSWAPEFFECT_FLIPEX;
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, d3dpp.BackBufferCount = 2;
"Using FlipEx swapping with DWM");
}
else {
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"Using discard swapping with DWM");
}
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"Windowed mode with DWM running"); "Windowed mode with DWM running");
@ -509,6 +496,7 @@ bool DXVA2Renderer::initializeDevice(SDL_Window* window, bool enableVsync)
// Uncomposited desktop or full-screen exclusive mode with V-sync enabled // Uncomposited desktop or full-screen exclusive mode with V-sync enabled
// We will enable V-sync in this scenario to avoid tearing. // We will enable V-sync in this scenario to avoid tearing.
d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_ONE; d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_ONE;
d3dpp.BackBufferCount = 1;
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"V-Sync enabled"); "V-Sync enabled");
@ -517,6 +505,7 @@ bool DXVA2Renderer::initializeDevice(SDL_Window* window, bool enableVsync)
// Uncomposited desktop or full-screen exclusive mode with V-sync disabled // Uncomposited desktop or full-screen exclusive mode with V-sync disabled
// We will allowing tearing for lowest latency. // We will allowing tearing for lowest latency.
d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE; d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
d3dpp.BackBufferCount = 1;
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"V-Sync disabled in tearing mode"); "V-Sync disabled in tearing mode");