Engine directory for ticket #1

Engine/source/scene/zones/sceneTraversalState.cpp

@@ -0,0 +1,70 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 2012 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+#include "platform/platform.h"
+#include "scene/zones/sceneTraversalState.h"
+
+#include "scene/sceneManager.h"
+#include "scene/culling/sceneCullingState.h"
+#include "scene/culling/sceneCullingVolume.h"
+#include "scene/zones/sceneZoneSpaceManager.h"
+
+
+//-----------------------------------------------------------------------------
+
+SceneTraversalState::SceneTraversalState( SceneCullingState* cullingState )
+   : mCullingState( cullingState ),
+     mTraversedArea( 0.f )
+{
+   VECTOR_SET_ASSOCIATION( mZoneStack );
+   VECTOR_SET_ASSOCIATION( mCullingVolumeStack );
+
+   // Push the polyhedron of the root frustum onto the traversal
+   // stack as the current culling volume.
+
+   pushCullingVolume( cullingState->getRootVolume() );
+}
+
+//-----------------------------------------------------------------------------
+
+SceneZoneSpace* SceneTraversalState::getZoneFromStack( U32 depth )
+{
+   SceneZoneSpaceManager* zoneManager = getCullingState()->getSceneManager()->getZoneManager();
+   U32 zoneId = getZoneIdFromStack( depth );
+
+   return zoneManager->getZoneOwner( zoneId );
+}
+
+//-----------------------------------------------------------------------------
+
+void SceneTraversalState::pushCullingVolume( const SceneCullingVolume& volume )
+{
+   mCullingVolumeStack.push_back( volume );
+}
+
+//-----------------------------------------------------------------------------
+
+void SceneTraversalState::popCullingVolume()
+{
+   AssertFatal( mCullingVolumeStack.size() > 1, "SceneTraversalState::popCullingVolume - Must not pop root volume" );
+   mCullingVolumeStack.pop_back();
+}