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Also skip SDL_RENDERER_PRESENTVSYNC on Wayland

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This commit is contained in:
Cameron Gutman 2023-09-09 10:41:33 -05:00
parent aaff04167b
commit 3094185cd6
1 changed files with 29 additions and 6 deletions
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35
app/streaming/video/ffmpeg-renderers/sdlvid.cpp
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@ -5,6 +5,8 @@
#include <Limelight.h>
#include <SDL_syswm.h>
SdlRenderer::SdlRenderer()
: m_VideoFormat(0),
m_Renderer(nullptr),
@ -98,15 +100,36 @@ bool SdlRenderer::initialize(PDECODER_PARAMETERS params)
return false;
}
#ifdef Q_OS_WIN32
// The Windows DWM has tear-free behavior even with V-Sync off, so we will only set SDL_RENDERER_PRESENTVSYNC
// when we're in full-screen exclusive mode if we're running on Windows.
if ((SDL_GetWindowFlags(params->window) & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN)
#endif
{
SDL_SysWMinfo info;
SDL_VERSION(&info.version);
if (!SDL_GetWindowWMInfo(params->window, &info)) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"SDL_GetWindowWMInfo() failed: %s",
SDL_GetError());
return false;
}
// Only set SDL_RENDERER_PRESENTVSYNC if we know we'll get tearing otherwise.
// Since we don't use V-Sync to pace our frame rate, we want non-blocking
// presents to reduce video latency.
switch (info.subsystem) {
case SDL_SYSWM_WINDOWS:
// DWM is always tear-free except in full-screen exclusive mode
if ((SDL_GetWindowFlags(params->window) & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN) {
if (params->enableVsync) {
rendererFlags |= SDL_RENDERER_PRESENTVSYNC;
}
}
break;
case SDL_SYSWM_WAYLAND:
// Wayland is always tear-free in all modes
break;
default:
// For other subsystems, just set SDL_RENDERER_PRESENTVSYNC if asked
if (params->enableVsync) {
rendererFlags |= SDL_RENDERER_PRESENTVSYNC;
}
break;
}
#ifdef Q_OS_WIN32