Improve high wind speed rain/snow behavior (#8864)

Enable water ripples and wrap-around
Remove rain particle angle random element
Simplify disabling rain ripples

apps/openmw/mwrender/renderingmanager.cpp

@@ -897,9 +897,7 @@ namespace MWRender
 
         mResourceSystem->getSceneManager()->getShaderManager().update(*mViewer);
 
-        float rainIntensity = mSky->getPrecipitationAlpha();
-        mWater->setRainIntensity(rainIntensity);
-        mWater->setRainRipplesEnabled(mSky->getRainRipplesEnabled());
+        mWater->setRainIntensity(mSky->getRainRipplesEnabled() ? mSky->getPrecipitationAlpha() : 0.f);
 
         mWater->update(dt, paused);
         if (!paused)

apps/openmw/mwrender/sky.cpp

@@ -517,7 +517,7 @@ namespace MWRender
 
     bool SkyManager::getRainRipplesEnabled() const
     {
-        if (!mEnabled || mIsStorm)
+        if (!mEnabled)
             return false;
 
         if (hasRain())
@@ -531,10 +531,7 @@ namespace MWRender
 
     float SkyManager::getPrecipitationAlpha() const
     {
-        if (mEnabled && !mIsStorm && (hasRain() || mParticleNode))
-            return mPrecipitationAlpha;
-
-        return 0.f;
+        return mPrecipitationAlpha;
     }
 
     void SkyManager::update(float duration)
@@ -729,7 +726,7 @@ namespace MWRender
                         = static_cast<osgParticle::ParticleSystem*>(findPSVisitor.mFoundNodes[i]);
 
                     osg::ref_ptr<osgParticle::ModularProgram> program = new osgParticle::ModularProgram;
-                    if (!mIsStorm)
+                    if (occlusionEnabledForEffect)
                         program->addOperator(new WrapAroundOperator(mCamera, defaultWrapRange));
                     program->addOperator(new WeatherAlphaOperator(mPrecipitationAlpha, false));
                     program->setParticleSystem(ps);

apps/openmw/mwrender/skyutil.cpp

@@ -1146,7 +1146,7 @@ namespace MWRender
     void RainShooter::shoot(osgParticle::Particle* particle) const
     {
         particle->setVelocity(mVelocity);
-        particle->setAngle(osg::Vec3f(-mAngle, 0, (Misc::Rng::rollProbability() * 2 - 1) * osg::PIf));
+        particle->setAngle(osg::Vec3f(-mAngle, 0.f, 0.f));
     }
 
     void RainShooter::setVelocity(const osg::Vec3f& velocity)

apps/openmw/mwrender/water.cpp

@@ -212,22 +212,15 @@ namespace MWRender
     class RainSettingsUpdater : public SceneUtil::StateSetUpdater
     {
     public:
-        RainSettingsUpdater()
-            : mRainIntensity(0.f)
-            , mEnableRipples(false)
-        {
-        }
+        RainSettingsUpdater() = default;
 
         void setRainIntensity(float rainIntensity) { mRainIntensity = rainIntensity; }
-        void setRipplesEnabled(bool enableRipples) { mEnableRipples = enableRipples; }
 
     protected:
         void setDefaults(osg::StateSet* stateset) override
         {
             osg::ref_ptr<osg::Uniform> rainIntensityUniform = new osg::Uniform("rainIntensity", 0.0f);
             stateset->addUniform(rainIntensityUniform.get());
-            osg::ref_ptr<osg::Uniform> enableRainRipplesUniform = new osg::Uniform("enableRainRipples", false);
-            stateset->addUniform(enableRainRipplesUniform.get());
         }
 
         void apply(osg::StateSet* stateset, osg::NodeVisitor* /*nv*/) override
@@ -235,14 +228,10 @@ namespace MWRender
             osg::ref_ptr<osg::Uniform> rainIntensityUniform = stateset->getUniform("rainIntensity");
             if (rainIntensityUniform != nullptr)
                 rainIntensityUniform->set(mRainIntensity);
-            osg::ref_ptr<osg::Uniform> enableRainRipplesUniform = stateset->getUniform("enableRainRipples");
-            if (enableRainRipplesUniform != nullptr)
-                enableRainRipplesUniform->set(mEnableRipples);
         }
 
     private:
-        float mRainIntensity;
-        bool mEnableRipples;
+        float mRainIntensity{ 0.f };
     };
 
     class Refraction : public SceneUtil::RTTNode
@@ -807,12 +796,6 @@ namespace MWRender
             mRainSettingsUpdater->setRainIntensity(rainIntensity);
     }
 
-    void Water::setRainRipplesEnabled(bool enableRipples)
-    {
-        if (mRainSettingsUpdater)
-            mRainSettingsUpdater->setRipplesEnabled(enableRipples);
-    }
-
     void Water::update(float dt, bool paused)
     {
         if (!paused)

apps/openmw/mwrender/water.hpp

@@ -114,7 +114,6 @@ namespace MWRender
         void changeCell(const MWWorld::CellStore* store);
         void setHeight(const float height);
         void setRainIntensity(const float rainIntensity);
-        void setRainRipplesEnabled(bool enableRipples);
 
         void update(float dt, bool paused);
 

files/shaders/compatibility/water.frag

@@ -80,7 +80,6 @@ uniform float near;
 uniform float far;
 
 uniform float rainIntensity;
-uniform bool enableRainRipples;
 
 uniform vec2 screenRes;
 
@@ -112,7 +111,7 @@ void main(void)
 
     vec4 rainRipple;
 
-    if (rainIntensity > 0.01 && enableRainRipples)
+    if (rainIntensity > 0.01)
         rainRipple = rainCombined(position.xy/1000.0, waterTimer) * clamp(rainIntensity, 0.0, 1.0);
     else
         rainRipple = vec4(0.0);