From 479fee984a595cab4fad0aae9157c5e168da692f Mon Sep 17 00:00:00 2001
From: Andrey Kleshchev <andreykproductengine@lindenlab.com>
Date: Fri, 29 Aug 2025 00:03:07 +0300
Subject: #4604 Warn user off high settings when on low-RAM hardware

---
 indra/newview/llfloaterpreference.cpp              | 28 ++++++++++++++++++++++
 indra/newview/llfloaterpreference.h                |  1 +
 .../newview/skins/default/xui/en/notifications.xml | 11 +++++++++
 3 files changed, 40 insertions(+)

diff --git a/indra/newview/llfloaterpreference.cpp b/indra/newview/llfloaterpreference.cpp
index b74736a39d..291f22d78f 100644
--- a/indra/newview/llfloaterpreference.cpp
+++ b/indra/newview/llfloaterpreference.cpp
@@ -758,6 +758,7 @@ void LLFloaterPreference::onOpen(const LLSD& key)
 
     // Forget previous language changes.
     mLanguageChanged = false;
+    mLastQualityLevel = gSavedSettings.getU32("RenderQualityPerformance");
 
     // Display selected maturity icons.
     onChangeMaturity();
@@ -1327,6 +1328,33 @@ void LLFloaterPreference::onCommitWindowedMode()
 void LLFloaterPreference::onChangeQuality(const LLSD& data)
 {
     U32 level = (U32)(data.asReal());
+    constexpr U32 LVL_HIGH = 4;
+    if (level >= LVL_HIGH && mLastQualityLevel < level)
+    {
+        constexpr U32 LOW_MEM_THRESHOLD = 4097;
+        U32 total_mem = (U32Megabytes)LLMemory::getMaxMemKB();
+        if (total_mem < LOW_MEM_THRESHOLD)
+        {
+            LLSD args;
+            args["TOTAL_MEM"] = LLSD::Integer(total_mem);
+            LLNotificationsUtil::add("PreferenceQualityWithLowMemory", args, LLSD(), [this](const LLSD& notification, const LLSD& response)
+            {
+                S32 option = LLNotificationsUtil::getSelectedOption(notification, response);
+                // If cancel pressed
+                if (option == 1)
+                {
+                    constexpr U32 LVL_MED_PLUS = 3;
+                    gSavedSettings.setU32("RenderQualityPerformance", LVL_MED_PLUS);
+                    mLastQualityLevel = LVL_MED_PLUS;
+                    LLFeatureManager::getInstance()->setGraphicsLevel(LVL_MED_PLUS, true);
+                    refreshEnabledGraphics();
+                    refresh();
+                }
+            }
+            );
+        }
+    }
+    mLastQualityLevel = level;
     LLFeatureManager::getInstance()->setGraphicsLevel(level, true);
     refreshEnabledGraphics();
     refresh();
diff --git a/indra/newview/llfloaterpreference.h b/indra/newview/llfloaterpreference.h
index fa9c421a8f..61ac0a4d77 100644
--- a/indra/newview/llfloaterpreference.h
+++ b/indra/newview/llfloaterpreference.h
@@ -218,6 +218,7 @@ private:
     bool mGotPersonalInfo;
     bool mLanguageChanged;
     bool mAvatarDataInitialized;
+    U32 mLastQualityLevel = 0;
     std::string mPriorInstantMessageLogPath;
 
     bool mOriginalHideOnlineStatus;
diff --git a/indra/newview/skins/default/xui/en/notifications.xml b/indra/newview/skins/default/xui/en/notifications.xml
index b182a241d8..7fc96af55d 100644
--- a/indra/newview/skins/default/xui/en/notifications.xml
+++ b/indra/newview/skins/default/xui/en/notifications.xml
@@ -12145,6 +12145,17 @@ Cannot create large prims that intersect other residents.  Please re-try when ot
      yestext="OK"/>
   </notification>
 
+  <notification
+   icon="alertmodal.tga"
+   name="PreferenceQualityWithLowMemory"
+   type="alert">
+Your system has [TOTAL_MEM]MB of memory, which might not be enough to run viewer at higher settings and might result in issues.
+      <usetemplate
+       name="okcancelbuttons"
+       notext="Cancel"
+       yestext="Continue"/>
+  </notification>
+
   <notification
    icon="alertmodal.tga"
    name="DefaultObjectPermissions"
-- 
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