RandomTreeLoader.h

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/*
This source file is part of Rigs of Rods
Copyright 2005-2012 Pierre-Michel Ricordel
Copyright 2007-2012 Thomas Fischer
 
For more information, see http://www.rigsofrods.org/
 
Rigs of Rods is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License version 3, as
published by the Free Software Foundation.
 
Rigs of Rods 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 Rigs of Rods.  If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifndef __RandomTreeLoader_H__
#define __RandomTreeLoader_H__
 
#include "RoRPrerequisites.h"
#include "PagedGeometry.h"
#include "PropertyMaps.h"
#include "TreeLoader2D.h"
 
 
 
 
namespace Forests {
 
class TreeIterator3D;
class TreeIterator2D;
 
class RandomTreeLoader : public TreeLoader2D, public ZeroedMemoryAllocator
{
public:
    RandomTreeLoader(PagedGeometry *geom, const TBounds &bounds) : TreeLoader2D(geom, bounds)
    {
    }
    
    ~RandomTreeLoader()
    {
    }
 
    void loadPage(PageInfo &page)
    {
        //Calculate x/z indexes for the grid array
        page.xIndex -= Math::Floor(gridBounds.left / pageSize);
        page.zIndex -= Math::Floor(gridBounds.top / pageSize);
 
        //Check if the requested page is in bounds
        if (page.xIndex < 0 || page.zIndex < 0 || page.xIndex >= pageGridX || page.zIndex >= pageGridZ)
            return;
 
        // just take the first tree registered as an example
        std::vector<TreeDef> *pageGrid = pageGridList.begin()->second;
        std::vector<TreeDef> &treeList = _getGridPage(pageGrid, page.xIndex, page.zIndex);
 
        // example values
        minimumScale=0.07;
        maximumScale=0.13;
        
        // if there are no tress in the page to be loaded, add some randomly
        if (treeList.size() == 0)
        {
            // only add trees if there are none in this page...
            for (int n=0; n < pageSize/10; n++)
            {
                //Create the new tree
                Real xrel = Math::RangeRandom(0, pageSize);
                Real zrel = Math::RangeRandom(0, pageSize);
                Degree yaw(Math::RangeRandom(0, 360));
                Real scale = Math::RangeRandom(minimumScale, maximumScale);
                
                TreeDef tree;
                tree.xPos = 65535 * (xrel - (page.xIndex * pageSize)) / pageSize;
                tree.zPos = 65535 * (zrel - (page.zIndex * pageSize)) / pageSize;
                tree.rotation = 255 * (yaw.valueDegrees() / 360.0f);
                tree.scale = 255 * ((scale - minimumScale) / maximumScale);
                treeList.push_back(tree);
            }
        }
        
        // now load page as normal
        TreeLoader2D::loadPage(page);
    }
 
    void unloadPage(PageInfo &page)
    {
        //Calculate x/z indexes for the grid array
        page.xIndex -= Math::Floor(gridBounds.left / pageSize);
        page.zIndex -= Math::Floor(gridBounds.top / pageSize);
 
        //Check if the requested page is in bounds
        if (page.xIndex < 0 || page.zIndex < 0 || page.xIndex >= pageGridX || page.zIndex >= pageGridZ)
            return;
 
        // just take the first tree registered as an example
        std::vector<TreeDef> *pageGrid = pageGridList.begin()->second;
        std::vector<TreeDef> &treeList = _getGridPage(pageGrid, page.xIndex, page.zIndex);
 
        // clear all existing trees
        uint32 i = 0;
        while (i < treeList.size()){
            //Check if tree is in bounds
#ifdef USE_PAGEDGEOMETRY_USER_DATA
            deletedUserData.push_back(treeList[i].userData);
#endif
            // delete it
            treeList[i] = treeList.back();
            treeList.pop_back();
            ++i;
        }
    
        // now unload page as normal
        TreeLoader2D::unloadPage(page);
    }
};
 
}
#endif