ovis: implement real-time shadows

modules/ovis/include/opencv2/ovis.hpp

@@ -52,7 +52,9 @@ enum SceneSettings
     /// Apply anti-aliasing. The first window determines the setting for all windows.
     SCENE_AA = 8,
     /// Render off-screen without a window. Allows separate AA setting. Requires manual update via @ref WindowScene::update
-    SCENE_OFFSCREEN = 16
+    SCENE_OFFSCREEN = 16,
+    /// Enable real-time shadows in the scene. All entities cast shadows by default. Control via @ref ENTITY_CAST_SHADOWS
+    SCENE_SHADOWS = 32
 };
 
 enum MaterialProperty
@@ -74,7 +76,8 @@ enum EntityProperty
     ENTITY_MATERIAL,
     ENTITY_SCALE,
     ENTITY_AABB_WORLD,
-    ENTITY_ANIMBLEND_MODE
+    ENTITY_ANIMBLEND_MODE,
+    ENTITY_CAST_SHADOWS
 };
 
 /**

modules/ovis/src/ovis.cpp

@@ -187,6 +187,7 @@ struct Application : public OgreBites::ApplicationContext, public OgreBites::Inp
     uint32_t h;
     int key_pressed;
     int flags;
+    Ogre::MaterialPtr casterMat;
 
     Application(const Ogre::String& _title, const Size& sz, int _flags)
         : OgreBites::ApplicationContext("ovis"), mainWin(NULL), title(_title), w(sz.width),
@@ -287,6 +288,9 @@ struct Application : public OgreBites::ApplicationContext, public OgreBites::Inp
         MaterialManager& matMgr = MaterialManager::getSingleton();
         matMgr.setDefaultTextureFiltering(TFO_ANISOTROPIC);
         matMgr.setDefaultAnisotropy(16);
+        casterMat = matMgr.create("DepthCaster", Ogre::RGN_INTERNAL);
+        casterMat->setLightingEnabled(false);
+        casterMat->setDepthBias(-1, -1);
     }
 };
 
@@ -318,6 +322,21 @@ public:
             RTShader::ShaderGenerator& shadergen = RTShader::ShaderGenerator::getSingleton();
             shadergen.addSceneManager(sceneMgr); // must be done before we do anything with the scene
 
+            if (flags & SCENE_SHADOWS)
+            {
+                sceneMgr->setShadowTechnique(SHADOWTYPE_TEXTURE_MODULATIVE_INTEGRATED);
+                sceneMgr->setShadowTexturePixelFormat(PF_DEPTH32);
+                // arbitrary heuristic for shadowmap size
+                sceneMgr->setShadowTextureSize(std::max(sz.width, sz.height) * 2);
+                sceneMgr->setShadowCameraSetup(FocusedShadowCameraSetup::create());
+                sceneMgr->setShadowTextureCasterMaterial(app->casterMat);
+
+                // inject shadowmap into materials
+                const auto& schemeName = RTShader::ShaderGenerator::DEFAULT_SCHEME_NAME;
+                auto rs = shadergen.getRenderState(schemeName);
+                rs->addTemplateSubRenderState(shadergen.createSubRenderState("SGX_IntegratedPSSM3"));
+            }
+
             sceneMgr->setAmbientLight(ColourValue(.1, .1, .1));
             _createBackground();
         }
@@ -716,6 +735,13 @@ public:
         SceneNode& node = _getSceneNode(sceneMgr, name);
         switch(prop)
         {
+        case ENTITY_CAST_SHADOWS:
+        {
+            Entity* ent = dynamic_cast<Entity*>(node.getAttachedObject(name));
+            CV_Assert(ent && "invalid entity");
+            ent->setCastShadows(bool(value[0]));
+            break;
+        }
         case ENTITY_SCALE:
         {
             node.setScale(value[0], value[1], value[2]);