mitigate ds artifacting and update linux-dmabuf comments

with this commit artifacting now only occurs when the
client's fps is above the refresh rate of the monitor

src/helpers/Monitor.cpp

@@ -812,6 +812,7 @@ bool CMonitor::attemptDirectScanout() {
     // and comes from the appropriate device. This may implode on multi-gpu!!
 
     output->state->setBuffer(PSURFACE->current.buffer);
+    output->state->setPresentationMode(Aquamarine::eOutputPresentationMode::AQ_OUTPUT_PRESENTATION_VSYNC);
 
     if (!state.test())
         return false;

src/protocols/LinuxDMABUF.cpp

@@ -441,7 +441,8 @@ CLinuxDMABufV1Protocol::CLinuxDMABufV1Protocol(const wl_interface* iface, const
         std::vector<std::pair<SP<CMonitor>, SDMABUFTranche>> tches;
 
         if (g_pCompositor->m_pAqBackend->hasSession()) {
-            // this assumes there's 1 device used for scanout and each monitor never changes its primary plane
+            // this assumes there's only 1 device used for both scanout and rendering
+            // also that each monitor never changes its primary plane
 
             for (auto& mon : g_pCompositor->m_vMonitors) {
                 auto tranche = SDMABUFTranche{
@@ -594,18 +595,14 @@ void CLinuxDMABufV1Protocol::updateScanoutTranche(SP<CWLSurfaceResource> surface
 
     LOGM(LOG, "updateScanoutTranche: sending a scanout tranche");
 
-    // send a dedicated scanout tranche that contains formats that:
-    //  - match the format of the output
-    //  - are not linear or implicit
-
     struct wl_array deviceArr = {
         .size = sizeof(mainDevice),
         .data = (void*)&mainDevice,
     };
     feedbackResource->resource->sendMainDevice(&deviceArr);
 
     // prioritize scnaout tranche but have renderer fallback tranche
-    // also yes flags can be duped here because different tranche flags (ds and no ds)
+    // also yes formats can be duped here because different tranche flags (ds and no ds)
     feedbackResource->sendTranche(monitorTranche);
     feedbackResource->sendTranche(formatTable->rendererTranche);
 

src/render/Renderer.cpp

@@ -1167,6 +1167,9 @@ void CHyprRenderer::renderMonitor(CMonitor* pMonitor) {
         g_pLayoutManager->getCurrentLayout()->recalculateMonitor(pMonitor->ID);
     }
 
+    if (!pMonitor->output->needsFrame && pMonitor->forceFullFrames == 0)
+        return;
+
     // tearing and DS first
     bool shouldTear = false;
     if (pMonitor->tearingState.nextRenderTorn) {
@@ -1211,9 +1214,7 @@ void CHyprRenderer::renderMonitor(CMonitor* pMonitor) {
     clock_gettime(CLOCK_MONOTONIC, &now);
 
     // check the damage
-    bool hasChanged = pMonitor->output->needsFrame || pMonitor->damage.hasChanged();
-
-    if (!hasChanged && *PDAMAGETRACKINGMODE != DAMAGE_TRACKING_NONE && pMonitor->forceFullFrames == 0 && damageBlinkCleanup == 0)
+    if (!pMonitor->damage.hasChanged() && *PDAMAGETRACKINGMODE != DAMAGE_TRACKING_NONE && damageBlinkCleanup == 0)
         return;
 
     if (*PDAMAGETRACKINGMODE == -1) {