From 532b26bf3cda07fc73f23bdf39f07678f2024389 Mon Sep 17 00:00:00 2001
From: scrawl <scrawl@baseoftrash.de>
Date: Fri, 14 Apr 2017 15:32:18 +0200
Subject: [PATCH] osgShadow experiment

---
 CMakeLists.txt                            |  2 +-
 apps/openmw/CMakeLists.txt                |  1 +
 apps/openmw/mwrender/renderingmanager.cpp | 43 +++++++++++++++++++++--
 apps/openmw/mwrender/vismask.hpp          |  4 ++-
 4 files changed, 45 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8b4e9ad4b4..7c8e8cd16e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -206,8 +206,8 @@ if(NOT HAVE_STDINT_H)
     message(FATAL_ERROR "stdint.h was not found" )
 endif()
 
+find_package(OpenSceneGraph 3.3.4 REQUIRED osgDB osgViewer osgText osgGA osgAnimation osgParticle osgUtil osgFX osgShadow)
 
-find_package(OpenSceneGraph 3.3.4 REQUIRED osgDB osgViewer osgText osgGA osgAnimation osgParticle osgUtil osgFX)
 include_directories(${OPENSCENEGRAPH_INCLUDE_DIRS})
 
 set(USED_OSG_PLUGINS
diff --git a/apps/openmw/CMakeLists.txt b/apps/openmw/CMakeLists.txt
index a066784888..6e4a7baab6 100644
--- a/apps/openmw/CMakeLists.txt
+++ b/apps/openmw/CMakeLists.txt
@@ -126,6 +126,7 @@ target_link_libraries(openmw
     ${OSGDB_LIBRARIES}
     ${OSGVIEWER_LIBRARIES}
     ${OSGGA_LIBRARIES}
+    ${OSGSHADOW_LIBRARIES}
     ${Boost_SYSTEM_LIBRARY}
     ${Boost_THREAD_LIBRARY}
     ${Boost_FILESYSTEM_LIBRARY}
diff --git a/apps/openmw/mwrender/renderingmanager.cpp b/apps/openmw/mwrender/renderingmanager.cpp
index 6ee9b8ae87..87c13f9814 100644
--- a/apps/openmw/mwrender/renderingmanager.cpp
+++ b/apps/openmw/mwrender/renderingmanager.cpp
@@ -13,6 +13,13 @@
 #include <osg/UserDataContainer>
 #include <osg/ComputeBoundsVisitor>
 
+#include <osgShadow/ShadowedScene>
+#include <osgShadow/ViewDependentShadowMap>
+#include <osgShadow/ShadowMap>
+#include <osgShadow/ParallelSplitShadowMap>
+#include <osgShadow/ShadowMap>
+#include <osgShadow/LightSpacePerspectiveShadowMap>
+
 #include <osgUtil/LineSegmentIntersector>
 #include <osgUtil/IncrementalCompileOperation>
 
@@ -183,6 +190,7 @@ namespace MWRender
         , mFieldOfViewOverridden(false)
     {
         resourceSystem->getSceneManager()->setParticleSystemMask(MWRender::Mask_ParticleSystem);
+
         resourceSystem->getSceneManager()->setShaderPath(resourcePath + "/shaders");
         resourceSystem->getSceneManager()->setForceShaders(Settings::Manager::getBool("force shaders", "Shaders"));
         resourceSystem->getSceneManager()->setClampLighting(Settings::Manager::getBool("clamp lighting", "Shaders"));
@@ -198,7 +206,35 @@ namespace MWRender
         mSceneRoot = sceneRoot;
         sceneRoot->setStartLight(1);
 
-        mRootNode->addChild(sceneRoot);
+        osg::ref_ptr<osgShadow::ShadowedScene> shadowedScene (new osgShadow::ShadowedScene);
+
+        osgShadow::ShadowSettings* settings = shadowedScene->getShadowSettings();
+        settings->setLightNum(0);
+        settings->setCastsShadowTraversalMask(Mask_Scene|Mask_Actor|Mask_Player);
+        settings->setReceivesShadowTraversalMask(~0u);
+
+        settings->setShadowMapProjectionHint(osgShadow::ShadowSettings::PERSPECTIVE_SHADOW_MAP);
+        settings->setBaseShadowTextureUnit(1);
+        settings->setMinimumShadowMapNearFarRatio(0);
+        settings->setNumShadowMapsPerLight(1);
+        //settings->setShadowMapProjectionHint(osgShadow::ShadowSettings::ORTHOGRAPHIC_SHADOW_MAP);
+        //settings->setMultipleShadowMapHint(osgShadow::ShadowSettings::PARALLEL_SPLIT); // ignored
+        //settings->setComputeNearFarModeOverride(osg::CullSettings::COMPUTE_NEAR_FAR_USING_PRIMITIVES);
+        //settings->setDebugDraw(true);
+
+        settings->setPerspectiveShadowMapCutOffAngle(0);
+        settings->setShaderHint(osgShadow::ShadowSettings::PROVIDE_VERTEX_AND_FRAGMENT_SHADER);
+
+        int mapres = 2048;
+        settings->setTextureSize(osg::Vec2s(mapres,mapres));
+
+        osgShadow::ShadowTechnique* tech = new osgShadow::ViewDependentShadowMap;
+        shadowedScene->setShadowTechnique(tech);
+
+        //mRootNode->addChild(sceneRoot);
+        shadowedScene->addChild(sceneRoot);
+        mRootNode->addChild(shadowedScene);
+
 
         mPathgrid.reset(new Pathgrid(mRootNode));
 
@@ -228,7 +264,7 @@ namespace MWRender
         mViewer->setLightingMode(osgViewer::View::NO_LIGHT);
 
         osg::ref_ptr<osg::LightSource> source = new osg::LightSource;
-        source->setNodeMask(Mask_Lighting);
+        //source->setNodeMask(Mask_Lighting);
         mSunLight = new osg::Light;
         source->setLight(mSunLight);
         mSunLight->setDiffuse(osg::Vec4f(0,0,0,1));
@@ -272,7 +308,8 @@ namespace MWRender
         mViewer->getCamera()->setComputeNearFarMode(osg::Camera::DO_NOT_COMPUTE_NEAR_FAR);
         mViewer->getCamera()->setCullingMode(cullingMode);
 
-        mViewer->getCamera()->setCullMask(~(Mask_UpdateVisitor|Mask_SimpleWater));
+        //mViewer->getCamera()->setCullMask(~(Mask_UpdateVisitor|Mask_SimpleWater));
+        mViewer->getCamera()->setCullMask(~(Mask_Lighting));
 
         mNearClip = Settings::Manager::getFloat("near clip", "Camera");
         mViewDistance = Settings::Manager::getFloat("viewing distance", "Camera");
diff --git a/apps/openmw/mwrender/vismask.hpp b/apps/openmw/mwrender/vismask.hpp
index d52c7c232e..1f620b7f71 100644
--- a/apps/openmw/mwrender/vismask.hpp
+++ b/apps/openmw/mwrender/vismask.hpp
@@ -51,7 +51,9 @@ namespace MWRender
         Mask_PreCompile = (1<<16),
 
         // Set on a camera's cull mask to enable the LightManager
-        Mask_Lighting = (1<<17)
+        Mask_Lighting = (1<<17),
+
+        Mask_CastsShadows = (1<<18)
     };
 
 }