#3364 Fix update rate being stuck high due to bias

if bias stays unchanged at 4.f, there is no reason to keep refreshing
at high rate.

1 files changed, 9 insertions, 2 deletions

diff --git a/indra/newview/llviewertexturelist.cpp b/indra/newview/llviewertexturelist.cpp
index 0b79c2d8e0..7f38642623 100644
--- a/indra/newview/llviewertexturelist.cpp
+++ b/indra/newview/llviewertexturelist.cpp
@@ -1198,10 +1198,17 @@ F32 LLViewerTextureList::updateImagesFetchTextures(F32 max_time)
 
     //update MIN_UPDATE_COUNT or 5% of other textures, whichever is greater
     update_count = llmax((U32) MIN_UPDATE_COUNT, (U32) mUUIDMap.size()/20);
-    if (LLViewerTexture::sDesiredDiscardBias > 1.f)
+    if (LLViewerTexture::sDesiredDiscardBias > 1.f
+        && LLViewerTexture::sBiasTexturesUpdated < (U32)mUUIDMap.size())
     {
-        // we are over memory target, update more agresively
+        // We are over memory target. Bias affects discard rates, so update
+        // existing textures agresively to free memory faster.
         update_count = (S32)(update_count * LLViewerTexture::sDesiredDiscardBias);
+
+        // This isn't particularly precise and can overshoot, but it doesn't need
+        // to be, just making sure it did a full circle and doesn't get stuck updating
+        // at bias = 4 with 4 times the rate permanently.
+        LLViewerTexture::sBiasTexturesUpdated += update_count;
     }
     update_count = llmin(update_count, (U32) mUUIDMap.size());