ModelAbstract.cpp

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/* Copyright (C) 2011 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "precompiled.h"

#include "ModelAbstract.h"

#include "ps/CLogger.h"

const CBoundingBoxOriented& CModelAbstract::GetSelectionBox()
{
    if (!m_SelectionBoxValid)
    {
        CalcSelectionBox();
        m_SelectionBoxValid = true;
    }
    return m_SelectionBox;
}

void CModelAbstract::CalcSelectionBox()
{
    if (m_CustomSelectionShape)
    {
        // custom shape
        switch(m_CustomSelectionShape->m_Type)
        {
        case CustomSelectionShape::BOX:
            {
                // create object-space bounds according to the information in the descriptor, and transform them to world-space.
                // the box is centered on the X and Z axes, but extends from 0 to its height on the Y axis.
                const float width = m_CustomSelectionShape->m_Size0;
                const float depth = m_CustomSelectionShape->m_Size1;
                const float height = m_CustomSelectionShape->m_Height;

                CBoundingBoxAligned bounds;
                bounds += CVector3D(-width/2.f, 0,     -depth/2.f);
                bounds += CVector3D( width/2.f, height, depth/2.f);

                bounds.Transform(GetTransform(), m_SelectionBox);
            }
            break;
        case CustomSelectionShape::CYLINDER:
            {
                // TODO: unimplemented
                m_SelectionBox.SetEmpty();
                LOGWARNING(L"[ModelAbstract] TODO: Cylinder selection boxes are not yet implemented. Use BOX or BOUNDS selection shapes instead.");
            }
            break;
        default:
            {
                m_SelectionBox.SetEmpty();
                //LOGWARNING(L"[ModelAbstract] Unrecognized selection shape type: %ld", m_CustomSelectionShape->m_Type);
                debug_warn("[ModelAbstract] Unrecognized selection shape type");
            }
            break;
        }
    }
    else
    {
        // standard method

        // Get the object-space bounds that should be used to construct this model (and its children)'s selection box
        CBoundingBoxAligned objBounds = GetObjectSelectionBoundsRec();
        if (objBounds.IsEmpty())
        {
            m_SelectionBox.SetEmpty(); // model does not wish to participate in selection
            return;
        }

        // Prevent the bounding box from extending through the terrain; clip the lower plane at Y=0 in object space.
        if (objBounds[1].Y > 0.f) // should always be the case, unless the models are defined really weirdly
            objBounds[0].Y = std::max(0.f, objBounds[0].Y);

        // transform object-space axis-aligned bounds to world-space arbitrary-aligned box
        objBounds.Transform(GetTransform(), m_SelectionBox);
    }
    
}