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Don't use swap interval 1 by default on Wayland systems

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This commit is contained in:
Cameron Gutman 2022-08-14 13:09:31 -05:00
commit aa7d5fa924
1 changed files with 16 additions and 1 deletions
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17
app/streaming/video/ffmpeg-renderers/eglvid.cpp
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@ -667,7 +667,22 @@ bool EGLRenderer::initialize(PDECODER_PARAMETERS params)
glClearColor(0, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
if (params->enableVsync) {
// SDL always uses swap interval 0 under the hood on Wayland systems,
// because the compositor guarantees tear-free rendering. In this
// situation, swap interval > 0 behaves as a frame pacing option
// rather than a way to eliminate tearing as SDL will block in
// SwapBuffers until the compositor consumes the frame. This will
// needlessly increases latency, so we should avoid it unless asked.
//
// HACK: In SDL 2.0.22+ on GNOME systems with fractional DPI scaling,
// the Wayland viewport can be stale when using Super+Left/Right/Up
// to resize the window. This seems to happen significantly more often
// with vsync enabled, so this also mitigates that problem too.
if (params->enableVsync
#ifdef SDL_VIDEO_DRIVER_WAYLAND
&& (info.subsystem != SDL_SYSWM_WAYLAND || params->enableFramePacing)
#endif
) {
SDL_GL_SetSwapInterval(1);
#if SDL_VERSION_ATLEAST(2, 0, 15) && defined(SDL_VIDEO_DRIVER_KMSDRM)