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x11: Introduce an envvar to force software vsync

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This can be useful for debugging purposes and for people wishing to ramp
up the refresh rate on their setups with different refresh rates.

BUG: 433094
This commit is contained in:
Vlad Zahorodnii 2021-02-18 14:14:41 +02:00
parent fb93037ca7
commit 45979ed460
1 changed files with 9 additions and 6 deletions
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15
src/plugins/platforms/x11/standalone/glxbackend.cpp
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@ -255,7 +255,8 @@ void GlxBackend::init()
glXQueryDrawable = nullptr;
}
if (supportsSwapEvent) {
static bool forceSoftwareVsync = qEnvironmentVariableIntValue("KWIN_X11_FORCE_SOFTWARE_VSYNC");
if (supportsSwapEvent && !forceSoftwareVsync) {
// Nice, the GLX_INTEL_swap_event extension is available. We are going to receive
// the presentation timestamp (UST) after glXSwapBuffers() via the X command stream.
m_swapEventFilter = std::make_unique<SwapEventFilter>(window, glxWindow);
@ -266,11 +267,13 @@ void GlxBackend::init()
// the vblank may occur right in between querying video sync counter and the act
// of swapping buffers, but on the other hand, there is no any better alternative
// option. NVIDIA doesn't provide any extension such as GLX_INTEL_swap_event.
if (!m_vsyncMonitor) {
m_vsyncMonitor = SGIVideoSyncVsyncMonitor::create(this);
}
if (!m_vsyncMonitor) {
m_vsyncMonitor = OMLSyncControlVsyncMonitor::create(this);
if (!forceSoftwareVsync) {
if (!m_vsyncMonitor) {
m_vsyncMonitor = SGIVideoSyncVsyncMonitor::create(this);
}
if (!m_vsyncMonitor) {
m_vsyncMonitor = OMLSyncControlVsyncMonitor::create(this);
}
}
if (!m_vsyncMonitor) {
SoftwareVsyncMonitor *monitor = SoftwareVsyncMonitor::create(this);