Correct base cloud speed, support Timescale Clouds fallback setting (#7792)

CHANGELOG.md

@@ -173,6 +173,7 @@
     Feature #7652: Sort inactive post processing shaders list properly
     Feature #7698: Implement sAbsorb, sDamage, sDrain, sFortify and sRestore
     Feature #7709: Improve resolution selection in Launcher
+    Feature #7792: Support Timescale Clouds
     Task #5896: Do not use deprecated MyGUI properties
     Task #6624: Drop support for saves made prior to 0.45
     Task #7113: Move from std::atoi to std::from_char

apps/openmw/mwrender/sky.cpp

@@ -240,6 +240,7 @@ namespace MWRender
         , mIsStorm(false)
         , mDay(0)
         , mMonth(0)
+        , mTimescaleClouds(Fallback::Map::getBool("Weather_Timescale_Clouds"))
         , mCloudAnimationTimer(0.f)
         , mRainTimer(0.f)
         , mStormParticleDirection(MWWorld::Weather::defaultDirection())
@@ -557,8 +558,17 @@ namespace MWRender
             mParticleNode->setAttitude(quat);
         }
 
+        const float timeScale = MWBase::Environment::get().getWorld()->getTimeManager()->getGameTimeScale();
+
         // UV Scroll the clouds
-        mCloudAnimationTimer += duration * mCloudSpeed * 0.003;
+        float cloudDelta = duration * mCloudSpeed / 400.f;
+        if (mTimescaleClouds)
+            cloudDelta *= timeScale / 60.f;
+
+        mCloudAnimationTimer += cloudDelta;
+        if (mCloudAnimationTimer >= 4.f)
+            mCloudAnimationTimer -= 4.f;
+
         mNextCloudUpdater->setTextureCoord(mCloudAnimationTimer);
         mCloudUpdater->setTextureCoord(mCloudAnimationTimer);
 
@@ -574,8 +584,7 @@ namespace MWRender
         }
 
         // rotate the stars by 360 degrees every 4 days
-        mAtmosphereNightRoll += MWBase::Environment::get().getWorld()->getTimeManager()->getGameTimeScale() * duration
-            * osg::DegreesToRadians(360.f) / (3600 * 96.f);
+        mAtmosphereNightRoll += timeScale * duration * osg::DegreesToRadians(360.f) / (3600 * 96.f);
         if (mAtmosphereNightNode->getNodeMask() != 0)
             mAtmosphereNightNode->setAttitude(osg::Quat(mAtmosphereNightRoll, osg::Vec3f(0, 0, 1)));
         mPrecipitationOccluder->update();

apps/openmw/mwrender/sky.hpp

@@ -165,6 +165,7 @@ namespace MWRender
         int mDay;
         int mMonth;
 
+        bool mTimescaleClouds;
         float mCloudAnimationTimer;
 
         float mRainTimer;