From ceaf0ee4092982075ea035238e46fc8d573bc64a Mon Sep 17 00:00:00 2001
From: scrawl <720642+scrawl@users.noreply.github.com>
Date: Tue, 31 Oct 2017 21:21:05 +0100
Subject: [PATCH] Enable shadow casting for terrain

Add a check to TerrainDrawable to make sure shadows are only drawn once, not once per blending pass
---
 apps/openmw/mwrender/renderingmanager.cpp | 2 +-
 components/terrain/terraindrawable.cpp    | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/apps/openmw/mwrender/renderingmanager.cpp b/apps/openmw/mwrender/renderingmanager.cpp
index 3c4c1101ff..cdf4ed16a4 100644
--- a/apps/openmw/mwrender/renderingmanager.cpp
+++ b/apps/openmw/mwrender/renderingmanager.cpp
@@ -206,7 +206,7 @@ namespace MWRender
 
         osgShadow::ShadowSettings* settings = shadowedScene->getShadowSettings();
         settings->setLightNum(0);
-        settings->setCastsShadowTraversalMask(Mask_Scene|Mask_Actor|Mask_Player);
+        settings->setCastsShadowTraversalMask(Mask_Scene|Mask_Actor|Mask_Player|Mask_Terrain);
         settings->setReceivesShadowTraversalMask(~0u);
 
         //settings->setShadowMapProjectionHint(osgShadow::ShadowSettings::PERSPECTIVE_SHADOW_MAP);
diff --git a/components/terrain/terraindrawable.cpp b/components/terrain/terraindrawable.cpp
index f3080e31cd..60d5917070 100644
--- a/components/terrain/terraindrawable.cpp
+++ b/components/terrain/terraindrawable.cpp
@@ -51,6 +51,12 @@ void TerrainDrawable::cull(osgUtil::CullVisitor *cv)
     if (osg::isNaN(depth))
         return;
 
+    if (cv->getCurrentCamera()->getName() == "ShadowCamera")
+    {
+        cv->addDrawableAndDepth(this, &matrix, depth);
+        return;
+    }
+
     bool pushedLight = mLightListCallback && mLightListCallback->pushLightState(this, cv);
 
     for (PassVector::const_iterator it = mPasses.begin(); it != mPasses.end(); ++it)