From ca5d5be4fb51fa1ee7ffda24a0aa58c71facd7dd Mon Sep 17 00:00:00 2001
From: Rider Linden <rider@lindenlab.com>
Date: Wed, 11 Jul 2018 16:46:14 -0700
Subject: Minor change from the simulator to throttle the minimum blend in a
 time based blend.

---
 indra/llinventory/llsettingsbase.cpp | 10 +++++++++-
 indra/llinventory/llsettingsbase.h   | 11 ++++++++++-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/indra/llinventory/llsettingsbase.cpp b/indra/llinventory/llsettingsbase.cpp
index f282f0c7dc..8bcf8a4973 100644
--- a/indra/llinventory/llsettingsbase.cpp
+++ b/indra/llinventory/llsettingsbase.cpp
@@ -607,6 +607,8 @@ void LLSettingsBlender::triggerComplete()
 }
 
 //-------------------------------------------------------------------------
+const LLSettingsBase::BlendFactor LLSettingsBlenderTimeDelta::MIN_BLEND_DELTA(0.001);
+
 LLSettingsBase::BlendFactor LLSettingsBlenderTimeDelta::calculateBlend(const LLSettingsBase::TrackPosition& spanpos, const LLSettingsBase::TrackPosition& spanlen) const
 {
     return LLSettingsBase::BlendFactor(fmod((F64)spanpos, (F64)spanlen) / (F64)spanlen);
@@ -629,9 +631,15 @@ void LLSettingsBlenderTimeDelta::applyTimeDelta(const LLSettingsBase::Seconds& t
         return;
     }
 
+    LLSettingsBase::BlendFactor blendf = calculateBlend(mTimeSpent, mBlendSpan);
     mTimeDeltaPassed = LLSettingsBase::Seconds(0.0);
 
-    LLSettingsBase::BlendFactor blendf = calculateBlend(mTimeSpent, mBlendSpan);
+    if (fabs(mLastBlendF - blendf) < mBlendFMinDelta)
+    {
+        return;
+    }
+
+    mLastBlendF = blendf;
 
     update(blendf);
 }
diff --git a/indra/llinventory/llsettingsbase.h b/indra/llinventory/llsettingsbase.h
index 6c3b9e23ee..a74579e7a6 100644
--- a/indra/llinventory/llsettingsbase.h
+++ b/indra/llinventory/llsettingsbase.h
@@ -57,6 +57,8 @@ class LLSettingsBase :
 
     friend std::ostream &operator <<(std::ostream& os, LLSettingsBase &settings);
 
+protected:
+    LOG_CLASS(LLSettingsBase);
 public:
     typedef F64Seconds Seconds;
     typedef F64        BlendFactor;
@@ -384,6 +386,8 @@ class LLSettingsBlenderTimeDelta : public LLSettingsBlender
 {
     LOG_CLASS(LLSettingsBlenderTimeDelta);
 public:
+    static const LLSettingsBase::BlendFactor MIN_BLEND_DELTA;
+
     LLSettingsBlenderTimeDelta(const LLSettingsBase::ptr_t &target,
         const LLSettingsBase::ptr_t &initsetting, const LLSettingsBase::ptr_t &endsetting, const LLSettingsBase::Seconds& blend_span) :
         LLSettingsBlender(target, initsetting, endsetting),
@@ -392,7 +396,9 @@ public:
         mTimeSpent(0.0f),
         mTimeDeltaThreshold(0.0f),
         mTimeDeltaPassed(0.0f),
-        mIgnoreTimeDelta(false)
+        mIgnoreTimeDelta(false),
+        mBlendFMinDelta(MIN_BLEND_DELTA),
+        mLastBlendF(-1.0f)
     {
         mTimeStart = LLSettingsBase::Seconds(LLDate::now().secondsSinceEpoch());
         mLastUpdate = mTimeStart;
@@ -411,6 +417,7 @@ public:
         mLastUpdate = mTimeStart;
         mTimeSpent  = LLSettingsBase::Seconds(0.0f);
         mTimeDeltaPassed = LLSettingsBase::Seconds(0.0f);
+        mLastBlendF = LLSettingsBase::BlendFactor(-1.0f);
     }
 
     virtual void applyTimeDelta(const LLSettingsBase::Seconds& timedelta) SETTINGS_OVERRIDE;
@@ -439,6 +446,8 @@ protected:
     LLSettingsBase::Seconds mTimeDeltaThreshold;
     LLSettingsBase::Seconds mTimeDeltaPassed;
     bool                    mIgnoreTimeDelta;
+    LLSettingsBase::BlendFactor mBlendFMinDelta;
+    LLSettingsBase::BlendFactor mLastBlendF;
 };
 
 
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