1 files changed, 32 insertions, 1 deletions
diff --git a/indra/newview/llviewertexture.cpp b/indra/newview/llviewertexture.cpp
index 4922df6738..bb16fec32a 100644
--- a/indra/newview/llviewertexture.cpp
+++ b/indra/newview/llviewertexture.cpp
@@ -70,6 +70,7 @@ LLPointer<LLViewerTexture>        LLViewerTexture::sBlackImagep = nullptr;
 LLPointer<LLViewerTexture>        LLViewerTexture::sCheckerBoardImagep = nullptr;
 LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sMissingAssetImagep = nullptr;
 LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sWhiteImagep = nullptr;
+LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sDefaultParticleImagep = nullptr;
 LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sDefaultImagep = nullptr;
 LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sSmokeImagep = nullptr;
 LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sFlatNormalImagep = nullptr;
@@ -547,7 +548,37 @@ void LLViewerTexture::updateClass()
 
     was_low = is_low;
 
-    sDesiredDiscardBias = llclamp(sDesiredDiscardBias, 1.f, 3.f);
+
+    // set to max discard bias if the window has been backgrounded for a while
+    static bool was_backgrounded = false;
+    static LLFrameTimer backgrounded_timer;
+
+    bool in_background = (gViewerWindow && !gViewerWindow->getWindow()->getVisible()) || !gFocusMgr.getAppHasFocus();
+
+    if (in_background)
+    {
+        if (backgrounded_timer.getElapsedTimeF32() > 10.f)
+        {
+            if (!was_backgrounded)
+            {
+                LL_INFOS() << "Viewer is backgrounded, freeing up video memory." << LL_ENDL;
+            }
+            was_backgrounded = true;
+            sDesiredDiscardBias = 4.f;
+        }
+    }
+    else
+    {
+        backgrounded_timer.reset();
+        if (was_backgrounded)
+        { // if the viewer was backgrounded
+            LL_INFOS() << "Viewer is no longer backgrounded, resuming normal texture usage." << LL_ENDL;
+            was_backgrounded = false;
+            sDesiredDiscardBias = 1.f;
+        }
+    }
+
+    sDesiredDiscardBias = llclamp(sDesiredDiscardBias, 1.f, 4.f);
 
     LLViewerTexture::sFreezeImageUpdates = false;
 }