Engine directory for ticket #1

Engine/source/T3D/decal/decalSphere.cpp

@@ -0,0 +1,109 @@
+//-----------------------------------------------------------------------------
+// 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 "T3D/decal/decalSphere.h"
+
+#include "scene/zones/sceneZoneSpaceManager.h"
+#include "T3D/decal/decalInstance.h"
+
+
+F32 DecalSphere::smDistanceTolerance = 30.0f;
+F32 DecalSphere::smRadiusTolerance = 40.0f;
+
+
+//-----------------------------------------------------------------------------
+
+bool DecalSphere::tryAddItem( DecalInstance* inst )
+{
+   // If we are further away from the center than our tolerance
+   // allows, don't use this sphere.
+   //
+   // Note that we take the distance from the nearest point on the
+   // bounding sphere rather than the distance to the center of the
+   // decal.  This takes decal sizes into account and generally works
+   // better.
+
+   const F32 distCenterToCenter = ( mWorldSphere.center - inst->mPosition ).len();
+   const F32 distBoundsToCenter = distCenterToCenter - inst->mSize / 2.f;
+
+   if( distBoundsToCenter > smDistanceTolerance )
+      return false;
+
+   // Also, if adding the current decal to the sphere would make
+   // it larger than our radius tolerance, don't use it.
+
+   const F32 newRadius = distCenterToCenter + inst->mSize / 2.f + 0.5f;
+   if( newRadius > mWorldSphere.radius && newRadius > smRadiusTolerance )
+      return false;
+
+   // Otherwise, go with this sphere and add the item to it.
+
+   mItems.push_back( inst );
+
+   // Update the sphere bounds, if necessary.
+
+   if( newRadius > mWorldSphere.radius )
+      updateWorldSphere();
+
+   return true;
+}
+
+//-----------------------------------------------------------------------------
+
+void DecalSphere::updateWorldSphere()
+{
+   AssertFatal( mItems.size() >= 1, "DecalSphere::updateWorldSphere - Sphere is empty!" );
+
+   Box3F aabb( mItems[ 0 ]->getWorldBox() );
+
+   const U32 numItems = mItems.size();
+   for( U32 i = 1; i < numItems; ++ i )
+      aabb.intersect( mItems[ i ]->getWorldBox() );
+
+   mWorldSphere = aabb.getBoundingSphere();
+      
+   // Clear the zoning data so that it gets recomputed.
+   mZones.clear();
+}
+
+//-----------------------------------------------------------------------------
+
+void DecalSphere::updateZoning( SceneZoneSpaceManager* zoneManager )
+{
+   mZones.clear();
+
+   // If there's only a single zone in the world, it must be the
+   // outdoor zone, so there's no point maintaining zoning information
+   // on all the decalspheres.
+
+   if( zoneManager->getNumZones() == 1 )
+      return;
+
+   // Otherwise query the scene graph for all zones that intersect with the
+   // AABB around our world sphere.
+
+   Box3F aabb( mWorldSphere.radius );
+   aabb.setCenter( mWorldSphere.center );
+
+   zoneManager->findZones( aabb, mZones );
+}