From 1bc857b12c434b7255119de009a50237856a90b2 Mon Sep 17 00:00:00 2001
From: UjinT34 <41110182+UjinT34@users.noreply.github.com>
Date: Wed, 4 Feb 2026 03:27:48 +0300
Subject: fifo: miscellaneous fifo fixes (#13136)

* LOGM: clang-tidy fix

* fix fifo state and scheduling

* disable fifo_pending_workaround by default

* fix tearing

* fix "empty" commit skipping
---
 src/protocols/Fifo.cpp | 90 +++++++++++++++++++++++++++++---------------------
 1 file changed, 53 insertions(+), 37 deletions(-)

(limited to 'src/protocols/Fifo.cpp')

diff --git a/src/protocols/Fifo.cpp b/src/protocols/Fifo.cpp
index 386327b5..8f842593 100644
--- a/src/protocols/Fifo.cpp
+++ b/src/protocols/Fifo.cpp
@@ -18,7 +18,8 @@ CFifoResource::CFifoResource(UP<CWpFifoV1>&& resource_, SP<CWLSurfaceResource> s
             return;
         }
 
-        m_pending.barrierSet = true;
+        m_surface->m_pending.barrierSet        = true;
+        m_surface->m_pending.updated.bits.fifo = true;
     });
 
     m_resource->setWaitBarrier([this](CWpFifoV1* r) {
@@ -27,54 +28,37 @@ CFifoResource::CFifoResource(UP<CWpFifoV1>&& resource_, SP<CWLSurfaceResource> s
             return;
         }
 
-        if (!m_pending.barrierSet)
+        if (!m_surface->m_current.barrierSet) {
+            // that might mean an empty commit with a barrier_set alone
+            static const auto PPEND = CConfigValue<Hyprlang::INT>("debug:fifo_pending_workaround");
+            if (!m_surface->m_pending.fifoScheduled)
+                m_surface->m_pending.fifoScheduled = checkMonitors(*PPEND);
+
             return;
+        }
 
-        m_pending.surfaceLocked = true;
+        m_surface->m_pending.surfaceLocked = true;
     });
 
     m_listeners.surfaceStateCommit = m_surface->m_events.stateCommit.listen([this](auto state) {
+        if (!state || !state->surfaceLocked)
+            return;
+
         static const auto PPEND = CConfigValue<Hyprlang::INT>("debug:fifo_pending_workaround");
 
-        if (!m_pending.surfaceLocked)
-            return;
+        //#TODO:
+        // this feels wrong, but if we have no pending frames, presented might never come because
+        // we are waiting on the barrier to unlock and no damage is around.
+        // unlock on timeout instead?
+        if (!state->fifoScheduled)
+            state->fifoScheduled = checkMonitors(*PPEND);
 
-        if (*PPEND) {
-            //#TODO:
-            // this feels wrong, but if we have no pending frames, presented might never come because
-            // we are waiting on the barrier to unlock and no damage is around.
-            // unlock on timeout instead?
-            if (m_surface->m_enteredOutputs.empty() && m_surface->m_hlSurface) {
-                for (auto& m : g_pCompositor->m_monitors) {
-                    if (!m || !m->m_enabled)
-                        continue;
-
-                    auto box = m_surface->m_hlSurface->getSurfaceBoxGlobal();
-                    if (box && !box->intersection({m->m_position, m->m_size}).empty()) {
-                        if (m->m_tearingState.activelyTearing)
-                            return; // dont fifo lock on tearing.
-
-                        g_pCompositor->scheduleFrameForMonitor(m, Aquamarine::IOutput::AQ_SCHEDULE_NEEDS_FRAME);
-                    }
-                }
-            } else {
-                for (auto& m : m_surface->m_enteredOutputs) {
-                    if (!m)
-                        continue;
-
-                    if (m->m_tearingState.activelyTearing)
-                        return; // dont fifo lock on tearing.
-
-                    g_pCompositor->scheduleFrameForMonitor(m.lock(), Aquamarine::IOutput::AQ_SCHEDULE_NEEDS_FRAME);
-                }
-            }
-        }
+        if (!state->fifoScheduled)
+            return;
 
         // only lock once its mapped.
         if (m_surface->m_mapped)
             m_surface->m_stateQueue.lock(state, LOCK_REASON_FIFO);
-
-        m_pending = {};
     });
 }
 
@@ -87,9 +71,41 @@ bool CFifoResource::good() {
 }
 
 void CFifoResource::presented() {
+    m_surface->m_current.barrierSet = false;
     m_surface->m_stateQueue.unlockFirst(LOCK_REASON_FIFO);
 }
 
+bool CFifoResource::checkMonitors(bool needsSchedule) {
+    if (m_surface->m_enteredOutputs.empty() && m_surface->m_hlSurface) {
+        for (auto& m : g_pCompositor->m_monitors) {
+            if (!m || !m->m_enabled)
+                continue;
+
+            auto box = m_surface->m_hlSurface->getSurfaceBoxGlobal();
+            if (box && !box->intersection({m->m_position, m->m_size}).empty()) {
+                if (m->m_tearingState.activelyTearing)
+                    return false; // dont fifo lock on tearing.
+
+                if (needsSchedule)
+                    g_pCompositor->scheduleFrameForMonitor(m, Aquamarine::IOutput::AQ_SCHEDULE_NEEDS_FRAME);
+            }
+        }
+    } else {
+        for (auto& m : m_surface->m_enteredOutputs) {
+            if (!m)
+                continue;
+
+            if (m->m_tearingState.activelyTearing)
+                return false; // dont fifo lock on tearing.
+
+            if (needsSchedule)
+                g_pCompositor->scheduleFrameForMonitor(m.lock(), Aquamarine::IOutput::AQ_SCHEDULE_NEEDS_FRAME);
+        }
+    }
+
+    return true;
+}
+
 CFifoManagerResource::CFifoManagerResource(UP<CWpFifoManagerV1>&& resource_) : m_resource(std::move(resource_)) {
     if UNLIKELY (!m_resource->resource())
         return;
-- 
cgit v1.2.3