2 files changed, 24 insertions, 6 deletions
diff --git a/indra/llinventory/llsettingssky.cpp b/indra/llinventory/llsettingssky.cpp
index eb8385281c..6521ec8b43 100644
--- a/indra/llinventory/llsettingssky.cpp
+++ b/indra/llinventory/llsettingssky.cpp
@@ -403,6 +403,7 @@ LLSettingsSky::LLSettingsSky(const LLSD &data) :
     mNextRainbowTextureId(),
     mNextHaloTextureId()
 {
+    mCanAutoAdjust = !data.has(SETTING_REFLECTION_PROBE_AMBIANCE);
 }
 
 LLSettingsSky::LLSettingsSky():
@@ -425,6 +426,8 @@ void LLSettingsSky::replaceSettings(LLSD settings)
     mNextBloomTextureId.setNull();
     mNextRainbowTextureId.setNull();
     mNextHaloTextureId.setNull();
+
+    mCanAutoAdjust = !settings.has(SETTING_REFLECTION_PROBE_AMBIANCE);
 }
 
 void LLSettingsSky::replaceWithSky(LLSettingsSky::ptr_t pother)
@@ -437,6 +440,7 @@ void LLSettingsSky::replaceWithSky(LLSettingsSky::ptr_t pother)
     mNextBloomTextureId = pother->mNextBloomTextureId;
     mNextRainbowTextureId = pother->mNextRainbowTextureId;
     mNextHaloTextureId = pother->mNextHaloTextureId;
+    mCanAutoAdjust = pother->mCanAutoAdjust;
 }
 
 void LLSettingsSky::blend(const LLSettingsBase::ptr_t &end, F64 blendf) 
@@ -1429,18 +1433,23 @@ F32 LLSettingsSky::getSkyIceLevel() const
     return mSettings[SETTING_SKY_ICE_LEVEL].asReal();
 }
 
-F32 LLSettingsSky::getReflectionProbeAmbiance() const
+F32 LLSettingsSky::getReflectionProbeAmbiance(bool auto_adjust) const
 {
+    if (auto_adjust && canAutoAdjust())
+    {
+        return 1.f;
+    }
+
     return mSettings[SETTING_REFLECTION_PROBE_AMBIANCE].asReal();
 }
 
-F32 LLSettingsSky::getTotalReflectionProbeAmbiance(F32 cloud_shadow_scale) const
+F32 LLSettingsSky::getTotalReflectionProbeAmbiance(F32 cloud_shadow_scale, bool auto_adjust) const
 {
     // feed cloud shadow back into reflection probe ambiance to mimic pre-reflection-probe behavior 
     // without brightening dark/interior spaces
-    F32 probe_ambiance = getReflectionProbeAmbiance();
+    F32 probe_ambiance = getReflectionProbeAmbiance(auto_adjust);
 
-    if (probe_ambiance > 0.f)
+    if (probe_ambiance > 0.f && probe_ambiance < 1.f)
     {
         probe_ambiance += (1.f - probe_ambiance) * getCloudShadow() * cloud_shadow_scale;
     }
diff --git a/indra/llinventory/llsettingssky.h b/indra/llinventory/llsettingssky.h
index 7ae569dd4c..f55e9f0631 100644
--- a/indra/llinventory/llsettingssky.h
+++ b/indra/llinventory/llsettingssky.h
@@ -134,10 +134,12 @@ public:
     F32 getSkyIceLevel() const;
 
     // get the probe ambiance setting as stored in the sky settings asset
-    F32 getReflectionProbeAmbiance() const;
+    // auto_adjust - if true and canAutoAdjust() is true, return 1.0
+    F32 getReflectionProbeAmbiance(bool auto_adjust = false) const;
 
     // get the probe ambiance setting to use for rendering (adjusted by cloud shadow, aka cloud coverage)
-    F32 getTotalReflectionProbeAmbiance(F32 cloud_shadow_scale) const;
+    // auto_adjust - if true and canAutoAdjust() is true, return 1.0
+    F32 getTotalReflectionProbeAmbiance(F32 cloud_shadow_scale, bool auto_adjust = false) const;
 
     // Return first (only) profile layer represented in LLSD
     LLSD getRayleighConfig() const;
@@ -334,6 +336,10 @@ public:
                     F32 aniso_factor = 0.0f);
 
     virtual void        updateSettings() SETTINGS_OVERRIDE;
+
+    // if true, this sky is a candidate for auto-adjustment
+    bool canAutoAdjust() const { return mCanAutoAdjust; }
+
 protected:
     static const std::string SETTING_LEGACY_EAST_ANGLE;
     static const std::string SETTING_LEGACY_ENABLE_CLOUD_SCROLL;
@@ -377,6 +383,9 @@ private:
     mutable LLColor4    mTotalAmbient;
     mutable LLColor4    mHazeColor;
 
+    // if true, this sky is a candidate for auto adjustment
+    bool mCanAutoAdjust = true;
+
     typedef std::map<std::string, S32> mapNameToUniformId_t;
 
     static mapNameToUniformId_t sNameToUniformMapping;