Engine directory for ticket #1

Engine/source/forest/forestCellBatch.cpp

@@ -0,0 +1,71 @@
+//-----------------------------------------------------------------------------
+// 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 "forest/forestCellBatch.h"
+
+#include "forest/forestItem.h"
+
+
+ForestCellBatch::ForestCellBatch()
+   :  mDirty( false ),
+      mBounds( Box3F::Invalid )
+{
+}
+
+ForestCellBatch::~ForestCellBatch()
+{
+}
+
+bool ForestCellBatch::add( const ForestItem &item )
+{
+   // A little hacky, but don't allow more than 65K / 6 items
+   // in a cell... this is generally the VB size limit on hardware.
+   const U32 maxItems = 10000;
+   if ( mItems.size() > maxItems )
+      return false;
+
+   // Do the pre batching tests... if it fails
+   // then we cannot batch this type!
+   if ( !_prepBatch( item ) )
+      return false;
+
+   // Add it to our list and we'll populate the VB at render time.
+   mItems.push_back( item );
+   mDirty = true;
+
+   // Expand out bounds.
+   const Box3F &box = item.getWorldBox();
+   mBounds.intersect( box );
+   return true;
+}
+
+void ForestCellBatch::render( SceneRenderState *state )
+{
+   if ( mDirty )
+   {
+      _rebuildBatch();
+      mDirty = false;
+   }
+
+   _render( state );
+}