824 lines
25 KiB
C++
824 lines
25 KiB
C++
#include <osg/AlphaFunc>
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#include <osg/Billboard>
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#include <osg/BlendFunc>
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#include <osg/Depth>
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#include <osg/Geode>
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#include <osg/Geometry>
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#include <osg/GL2Extensions>
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#include <osg/Material>
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#include <osg/Math>
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#include <osg/MatrixTransform>
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#include <osg/PolygonOffset>
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#include <osg/Program>
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#include <osg/Projection>
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#include <osg/Shader>
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#include <osg/ShapeDrawable>
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#include <osg/StateSet>
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#include <osg/Switch>
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#include <osg/Texture2D>
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#include <osg/Uniform>
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#include <osgDB/ReadFile>
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#include <osgDB/FileUtils>
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#include <osgUtil/IntersectVisitor>
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#include <osgUtil/SmoothingVisitor>
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#include <osgText/Text>
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#include <osgProducer/Viewer>
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// for the grid data..
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#include "../osghangglide/terrain_coords.h"
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// class to create the forest and manage the movement between various techniques.
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class ForestTechniqueManager : public osg::Referenced
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{
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public:
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ForestTechniqueManager() {}
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class Tree : public osg::Referenced
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{
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public:
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Tree():
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_color(255,255,255,255),
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_width(1.0f),
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_height(1.0f),
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_type(0) {}
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Tree(const osg::Vec3& position, const osg::Vec4ub& color, float width, float height, unsigned int type):
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_position(position),
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_color(color),
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_width(width),
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_height(height),
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_type(type) {}
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osg::Vec3 _position;
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osg::Vec4ub _color;
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float _width;
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float _height;
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unsigned int _type;
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};
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typedef std::vector< osg::ref_ptr<Tree> > TreeList;
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class Cell : public osg::Referenced
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{
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public:
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typedef std::vector< osg::ref_ptr<Cell> > CellList;
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Cell():_parent(0) {}
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Cell(osg::BoundingBox& bb):_parent(0), _bb(bb) {}
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void addCell(Cell* cell) { cell->_parent=this; _cells.push_back(cell); }
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void addTree(Tree* tree) { _trees.push_back(tree); }
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void addTrees(const TreeList& trees) { _trees.insert(_trees.end(),trees.begin(),trees.end()); }
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void computeBound();
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bool contains(const osg::Vec3& position) const { return _bb.contains(position); }
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bool divide(unsigned int maxNumTreesPerCell=10);
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bool devide(bool xAxis, bool yAxis, bool zAxis);
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void bin();
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Cell* _parent;
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osg::BoundingBox _bb;
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CellList _cells;
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TreeList _trees;
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};
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float random(float min,float max) { return min + (max-min)*(float)rand()/(float)RAND_MAX; }
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int random(int min,int max) { return min + (int)((float)(max-min)*(float)rand()/(float)RAND_MAX); }
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osg::Geode* createTerrain(const osg::Vec3& origin, const osg::Vec3& size);
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void createTreeList(osg::Node* terrain,const osg::Vec3& origin, const osg::Vec3& size,unsigned int numTreesToCreate,TreeList& trees);
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osg::Geometry* createOrthogonalQuadsNoColor( const osg::Vec3& pos, float w, float h );
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osg::Node* createShaderGraph(Cell* cell,osg::StateSet* stateset);
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osg::Node* createScene(unsigned int numTreesToCreates);
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};
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// event handler to capture keyboard events and use them to advance the technique used for rendering
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void ForestTechniqueManager::Cell::computeBound()
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{
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_bb.init();
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for(CellList::iterator citr=_cells.begin();
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citr!=_cells.end();
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++citr)
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{
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(*citr)->computeBound();
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_bb.expandBy((*citr)->_bb);
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}
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for(TreeList::iterator titr=_trees.begin();
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titr!=_trees.end();
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++titr)
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{
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_bb.expandBy((*titr)->_position);
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}
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}
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bool ForestTechniqueManager::Cell::divide(unsigned int maxNumTreesPerCell)
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{
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if (_trees.size()<=maxNumTreesPerCell) return false;
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computeBound();
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float radius = _bb.radius();
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float divide_distance = radius*0.7f;
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if (devide((_bb.xMax()-_bb.xMin())>divide_distance,(_bb.yMax()-_bb.yMin())>divide_distance,(_bb.zMax()-_bb.zMin())>divide_distance))
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{
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// recusively divide the new cells till maxNumTreesPerCell is met.
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for(CellList::iterator citr=_cells.begin();
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citr!=_cells.end();
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++citr)
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{
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(*citr)->divide(maxNumTreesPerCell);
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}
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return true;
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}
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else
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{
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return false;
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}
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}
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bool ForestTechniqueManager::Cell::devide(bool xAxis, bool yAxis, bool zAxis)
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{
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if (!(xAxis || yAxis || zAxis)) return false;
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if (_cells.empty())
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_cells.push_back(new Cell(_bb));
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if (xAxis)
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{
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unsigned int numCellsToDivide=_cells.size();
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for(unsigned int i=0;i<numCellsToDivide;++i)
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{
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Cell* orig_cell = _cells[i].get();
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Cell* new_cell = new Cell(orig_cell->_bb);
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float xCenter = (orig_cell->_bb.xMin()+orig_cell->_bb.xMax())*0.5f;
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orig_cell->_bb.xMax() = xCenter;
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new_cell->_bb.xMin() = xCenter;
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_cells.push_back(new_cell);
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}
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}
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if (yAxis)
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{
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unsigned int numCellsToDivide=_cells.size();
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for(unsigned int i=0;i<numCellsToDivide;++i)
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{
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Cell* orig_cell = _cells[i].get();
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Cell* new_cell = new Cell(orig_cell->_bb);
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float yCenter = (orig_cell->_bb.yMin()+orig_cell->_bb.yMax())*0.5f;
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orig_cell->_bb.yMax() = yCenter;
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new_cell->_bb.yMin() = yCenter;
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_cells.push_back(new_cell);
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}
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}
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if (zAxis)
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{
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unsigned int numCellsToDivide=_cells.size();
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for(unsigned int i=0;i<numCellsToDivide;++i)
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{
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Cell* orig_cell = _cells[i].get();
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Cell* new_cell = new Cell(orig_cell->_bb);
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float zCenter = (orig_cell->_bb.zMin()+orig_cell->_bb.zMax())*0.5f;
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orig_cell->_bb.zMax() = zCenter;
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new_cell->_bb.zMin() = zCenter;
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_cells.push_back(new_cell);
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}
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}
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bin();
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return true;
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}
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void ForestTechniqueManager::Cell::bin()
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{
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// put trees in apprpriate cells.
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TreeList treesNotAssigned;
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for(TreeList::iterator titr=_trees.begin();
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titr!=_trees.end();
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++titr)
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{
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Tree* tree = titr->get();
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bool assigned = false;
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for(CellList::iterator citr=_cells.begin();
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citr!=_cells.end() && !assigned;
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++citr)
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{
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if ((*citr)->contains(tree->_position))
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{
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(*citr)->addTree(tree);
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assigned = true;
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}
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}
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if (!assigned) treesNotAssigned.push_back(tree);
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}
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// put the unassigned trees back into the original local tree list.
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_trees.swap(treesNotAssigned);
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// prune empty cells.
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CellList cellsNotEmpty;
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for(CellList::iterator citr=_cells.begin();
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citr!=_cells.end();
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++citr)
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{
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if (!((*citr)->_trees.empty()))
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{
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cellsNotEmpty.push_back(*citr);
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}
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}
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_cells.swap(cellsNotEmpty);
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}
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void ForestTechniqueManager::createTreeList(osg::Node* terrain,const osg::Vec3& origin, const osg::Vec3& size,unsigned int numTreesToCreate,TreeList& trees)
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{
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float max_TreeHeight = sqrtf(size.length2()/(float)numTreesToCreate);
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float max_TreeWidth = max_TreeHeight*0.5f;
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float min_TreeHeight = max_TreeHeight*0.3f;
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float min_TreeWidth = min_TreeHeight*0.5f;
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trees.reserve(trees.size()+numTreesToCreate);
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for(unsigned int i=0;i<numTreesToCreate;++i)
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{
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Tree* tree = new Tree;
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tree->_position.set(random(origin.x(),origin.x()+size.x()),random(origin.y(),origin.y()+size.y()),origin.z());
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tree->_color.set(random(128,255),random(128,255),random(128,255),255);
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tree->_width = random(min_TreeWidth,max_TreeWidth);
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tree->_height = random(min_TreeHeight,max_TreeHeight);
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tree->_type = 0;
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if (terrain)
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{
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osgUtil::IntersectVisitor iv;
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osg::ref_ptr<osg::LineSegment> segDown = new osg::LineSegment;
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segDown->set(tree->_position,tree->_position+osg::Vec3(0.0f,0.0f,size.z()));
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iv.addLineSegment(segDown.get());
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terrain->accept(iv);
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if (iv.hits())
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{
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osgUtil::IntersectVisitor::HitList& hitList = iv.getHitList(segDown.get());
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if (!hitList.empty())
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{
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osg::Vec3 ip = hitList.front().getWorldIntersectPoint();
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osg::Vec3 np = hitList.front().getWorldIntersectNormal();
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tree->_position = ip;
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}
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}
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}
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trees.push_back(tree);
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}
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}
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osg::Geometry* ForestTechniqueManager::createOrthogonalQuadsNoColor( const osg::Vec3& pos, float w, float h)
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{
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// set up the coords
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osg::Vec3Array& v = *(new osg::Vec3Array(8));
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osg::Vec2Array& t = *(new osg::Vec2Array(8));
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float rotation = random(0.0f,osg::PI/2.0f);
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float sw = sinf(rotation)*w*0.5f;
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float cw = cosf(rotation)*w*0.5f;
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v[0].set(pos.x()-sw,pos.y()-cw,pos.z()+0.0f);
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v[1].set(pos.x()+sw,pos.y()+cw,pos.z()+0.0f);
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v[2].set(pos.x()+sw,pos.y()+cw,pos.z()+h);
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v[3].set(pos.x()-sw,pos.y()-cw,pos.z()+h);
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v[4].set(pos.x()-cw,pos.y()+sw,pos.z()+0.0f);
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v[5].set(pos.x()+cw,pos.y()-sw,pos.z()+0.0f);
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v[6].set(pos.x()+cw,pos.y()-sw,pos.z()+h);
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v[7].set(pos.x()-cw,pos.y()+sw,pos.z()+h);
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t[0].set(0.0f,0.0f);
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t[1].set(1.0f,0.0f);
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t[2].set(1.0f,1.0f);
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t[3].set(0.0f,1.0f);
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t[4].set(0.0f,0.0f);
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t[5].set(1.0f,0.0f);
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t[6].set(1.0f,1.0f);
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t[7].set(0.0f,1.0f);
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osg::Geometry *geom = new osg::Geometry;
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geom->setVertexArray( &v );
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geom->setTexCoordArray( 0, &t );
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geom->addPrimitiveSet( new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,8) );
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return geom;
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}
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class ShaderGeometry : public osg::Drawable
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{
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public:
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ShaderGeometry() { setUseDisplayList(false); }
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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ShaderGeometry(const ShaderGeometry& ShaderGeometry,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
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osg::Drawable(ShaderGeometry,copyop) {}
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META_Object(osg,ShaderGeometry)
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typedef std::vector<osg::Vec4> PositionSizeList;
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virtual void drawImplementation(osg::State& state) const
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{
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for(PositionSizeList::const_iterator itr = _trees.begin();
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itr != _trees.end();
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++itr)
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{
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glColor4fv(itr->ptr());
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_geometry->draw(state);
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}
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}
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virtual osg::BoundingBox computeBound() const
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{
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osg::BoundingBox geom_box = _geometry->getBound();
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osg::BoundingBox bb;
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for(PositionSizeList::const_iterator itr = _trees.begin();
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itr != _trees.end();
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++itr)
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{
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bb.expandBy(geom_box.corner(0)*(*itr)[3] +
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osg::Vec3( (*itr)[0], (*itr)[1], (*itr)[2] ));
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bb.expandBy(geom_box.corner(7)*(*itr)[3] +
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osg::Vec3( (*itr)[0], (*itr)[1], (*itr)[2] ));
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}
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return bb;
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}
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void setGeometry(osg::Geometry* geometry)
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{
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_geometry = geometry;
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}
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void addTree(ForestTechniqueManager::Tree& tree)
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{
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_trees.push_back(osg::Vec4(tree._position.x(), tree._position.y(), tree._position.z(), tree._height));
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}
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osg::ref_ptr<osg::Geometry> _geometry;
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PositionSizeList _trees;
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protected:
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virtual ~ShaderGeometry() {}
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};
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osg::Geometry* shared_geometry = 0;
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osg::Node* ForestTechniqueManager::createShaderGraph(Cell* cell,osg::StateSet* stateset)
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{
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if (shared_geometry==0)
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{
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shared_geometry = createOrthogonalQuadsNoColor(osg::Vec3(0.0f,0.0f,0.0f),1.0f,1.0f);
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//shared_geometry->setUseDisplayList(false);
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}
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bool needGroup = !(cell->_cells.empty());
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bool needTrees = !(cell->_trees.empty());
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osg::Geode* geode = 0;
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osg::Group* group = 0;
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if (needTrees)
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{
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geode = new osg::Geode;
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ShaderGeometry* shader_geometry = new ShaderGeometry;
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shader_geometry->setGeometry(shared_geometry);
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for(TreeList::iterator itr=cell->_trees.begin();
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itr!=cell->_trees.end();
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++itr)
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{
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Tree& tree = **itr;
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shader_geometry->addTree(tree);
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}
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geode->setStateSet(stateset);
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geode->addDrawable(shader_geometry);
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}
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if (needGroup)
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{
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group = new osg::Group;
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for(Cell::CellList::iterator itr=cell->_cells.begin();
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itr!=cell->_cells.end();
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++itr)
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{
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group->addChild(createShaderGraph(itr->get(),stateset));
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}
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if (geode) group->addChild(geode);
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}
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if (group) return group;
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else return geode;
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}
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osg::Node* ForestTechniqueManager::createScene(unsigned int /*numTreesToCreates*/)
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{
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osg::Group* scene = new osg::Group;
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unsigned int numColumns = 38;
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unsigned int numRows = 39;
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unsigned int r;
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unsigned int c;
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osg::Vec3 origin(0.0f,0.0f,0.0f);
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osg::Vec3 size(1000.0f,1000.0f,250.0f);
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osg::Vec3 scaleDown(1.0f/size.x(),1.0f/size.y(),1.0f/size.z());
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// ---------------------------------------
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// Set up a StateSet to texture the objects
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// ---------------------------------------
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osg::StateSet* stateset = new osg::StateSet();
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osg::Uniform* originUniform = new osg::Uniform("terrainOrigin",origin);
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stateset->addUniform(originUniform);
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osg::Uniform* sizeUniform = new osg::Uniform("terrainSize",size);
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stateset->addUniform(sizeUniform);
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osg::Uniform* scaleDownUniform = new osg::Uniform("terrainScaleDown",scaleDown);
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stateset->addUniform(scaleDownUniform);
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osg::Uniform* terrainTextureSampler = new osg::Uniform("terrainTexture",0);
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stateset->addUniform(terrainTextureSampler);
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osg::Uniform* baseTextureSampler = new osg::Uniform("baseTexture",1);
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stateset->addUniform(baseTextureSampler);
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osg::Uniform* treeTextureSampler = new osg::Uniform("treeTexture",1);
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stateset->addUniform(treeTextureSampler);
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// compute z range of z values of grid data so we can scale it.
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float min_z = FLT_MAX;
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float max_z = -FLT_MAX;
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for(r=0;r<numRows;++r)
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{
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for(c=0;c<numColumns;++c)
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{
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min_z = osg::minimum(min_z,vertex[r+c*numRows][2]);
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max_z = osg::maximum(max_z,vertex[r+c*numRows][2]);
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}
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}
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float scale_z = size.z()/(max_z-min_z);
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osg::Image* terrainImage = new osg::Image;
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terrainImage->allocateImage(numColumns,numRows,1,GL_LUMINANCE, GL_FLOAT);
|
|
terrainImage->setInternalTextureFormat(GL_LUMINANCE_FLOAT32_ATI);
|
|
for(r=0;r<numRows;++r)
|
|
{
|
|
for(c=0;c<numColumns;++c)
|
|
{
|
|
*((float*)(terrainImage->data(c,r))) = (vertex[r+c*numRows][2]-min_z)*scale_z;
|
|
}
|
|
}
|
|
|
|
osg::Texture2D* terrainTexture = new osg::Texture2D;
|
|
terrainTexture->setImage(terrainImage);
|
|
terrainTexture->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::NEAREST);
|
|
terrainTexture->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::NEAREST);
|
|
//terrainTexture->setResizeNonPowerOfTwoHint(true);
|
|
stateset->setTextureAttributeAndModes(0,terrainTexture,osg::StateAttribute::ON);
|
|
|
|
|
|
osg::Image* image = osgDB::readImageFile("Images/lz.rgb");
|
|
if (image)
|
|
{
|
|
osg::Texture2D* texture = new osg::Texture2D;
|
|
|
|
texture->setImage(image);
|
|
stateset->setTextureAttributeAndModes(1,texture,osg::StateAttribute::ON);
|
|
}
|
|
|
|
{
|
|
std::cout<<"Creating terrain...";
|
|
|
|
osg::Geode* geode = new osg::Geode();
|
|
geode->setStateSet( stateset );
|
|
|
|
|
|
{
|
|
osg::Program* program = new osg::Program;
|
|
stateset->setAttribute(program);
|
|
|
|
#if 1
|
|
// use inline shaders
|
|
|
|
///////////////////////////////////////////////////////////////////
|
|
// vertex shader using just Vec4 coefficients
|
|
char vertexShaderSource[] =
|
|
"uniform float osg_FrameTime;\n"
|
|
"uniform sampler2D terrainTexture;\n"
|
|
"uniform vec3 terrainOrigin;\n"
|
|
"uniform vec3 terrainScaleDown;\n"
|
|
"\n"
|
|
"varying vec2 texcoord;\n"
|
|
"\n"
|
|
"void main(void)\n"
|
|
"{\n"
|
|
" texcoord = gl_Vertex.xy - terrainOrigin.xy;\n"
|
|
" texcoord.x *= terrainScaleDown.x;\n"
|
|
" texcoord.y *= terrainScaleDown.y;\n"
|
|
"\n"
|
|
" vec4 position;\n"
|
|
" position.x = gl_Vertex.x;\n"
|
|
" position.y = gl_Vertex.y;\n"
|
|
" position.z = texture2D(terrainTexture, texcoord).r;\n"
|
|
" \n"
|
|
" gl_Position = gl_ModelViewProjectionMatrix * position;\n"
|
|
" gl_FrontColor = vec4(1.0,1.0,1.0,1.0);\n"
|
|
"}\n";
|
|
|
|
//////////////////////////////////////////////////////////////////
|
|
// fragment shader
|
|
//
|
|
char fragmentShaderSource[] =
|
|
"uniform sampler2D baseTexture; \n"
|
|
"varying vec2 texcoord;\n"
|
|
"\n"
|
|
"void main(void) \n"
|
|
"{\n"
|
|
" gl_FragColor = texture2D( baseTexture, texcoord); \n"
|
|
"}\n";
|
|
|
|
program->addShader(new osg::Shader(osg::Shader::VERTEX, vertexShaderSource));
|
|
program->addShader(new osg::Shader(osg::Shader::FRAGMENT, fragmentShaderSource));
|
|
|
|
#else
|
|
|
|
// get shaders from source
|
|
program->addShader(osg::Shader::readShaderFile(osg::Shader::VERTEX, osgDB::findDataFile("shaders/terrain.vert")));
|
|
program->addShader(osg::Shader::readShaderFile(osg::Shader::FRAGMENT, osgDB::findDataFile("shaders/terrain.frag")));
|
|
|
|
#endif
|
|
|
|
// get shaders from source
|
|
}
|
|
|
|
|
|
{
|
|
osg::Geometry* geometry = new osg::Geometry;
|
|
|
|
osg::Vec3Array& v = *(new osg::Vec3Array(numColumns*numRows));
|
|
osg::Vec4ubArray& color = *(new osg::Vec4ubArray(1));
|
|
|
|
color[0].set(255,255,255,255);
|
|
|
|
float rowCoordDelta = size.y()/(float)(numRows-1);
|
|
float columnCoordDelta = size.x()/(float)(numColumns-1);
|
|
|
|
float rowTexDelta = 1.0f/(float)(numRows-1);
|
|
float columnTexDelta = 1.0f/(float)(numColumns-1);
|
|
|
|
osg::Vec3 pos = origin;
|
|
osg::Vec2 tex(0.0f,0.0f);
|
|
int vi=0;
|
|
for(r=0;r<numRows;++r)
|
|
{
|
|
pos.x() = origin.x();
|
|
tex.x() = 0.0f;
|
|
for(c=0;c<numColumns;++c)
|
|
{
|
|
v[vi].set(pos.x(),pos.y(),pos.z());
|
|
pos.x()+=columnCoordDelta;
|
|
tex.x()+=columnTexDelta;
|
|
++vi;
|
|
}
|
|
pos.y() += rowCoordDelta;
|
|
tex.y() += rowTexDelta;
|
|
}
|
|
|
|
geometry->setVertexArray(&v);
|
|
geometry->setColorArray(&color);
|
|
geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
|
|
|
|
for(r=0;r<numRows-1;++r)
|
|
{
|
|
osg::DrawElementsUShort& drawElements = *(new osg::DrawElementsUShort(GL_QUAD_STRIP,2*numColumns));
|
|
geometry->addPrimitiveSet(&drawElements);
|
|
int ei=0;
|
|
for(c=0;c<numColumns;++c)
|
|
{
|
|
drawElements[ei++] = (r+1)*numColumns+c;
|
|
drawElements[ei++] = (r)*numColumns+c;
|
|
}
|
|
}
|
|
|
|
geometry->setInitialBound(osg::BoundingBox(origin, origin+size));
|
|
|
|
geode->addDrawable(geometry);
|
|
|
|
scene->addChild(geode);
|
|
}
|
|
}
|
|
|
|
std::cout<<"done."<<std::endl;
|
|
#if 0
|
|
std::cout<<"Creating tree locations...";std::cout.flush();
|
|
TreeList trees;
|
|
createTreeList(0,origin,size,numTreesToCreates,trees);
|
|
std::cout<<"done."<<std::endl;
|
|
|
|
std::cout<<"Creating cell subdivision...";
|
|
osg::ref_ptr<Cell> cell = new Cell;
|
|
cell->addTrees(trees);
|
|
cell->divide();
|
|
std::cout<<"done."<<std::endl;
|
|
|
|
|
|
osg::Texture2D *tex = new osg::Texture2D;
|
|
tex->setWrap( osg::Texture2D::WRAP_S, osg::Texture2D::CLAMP );
|
|
tex->setWrap( osg::Texture2D::WRAP_T, osg::Texture2D::CLAMP );
|
|
tex->setImage(osgDB::readImageFile("Images/tree0.rgba"));
|
|
|
|
osg::StateSet *dstate = new osg::StateSet;
|
|
{
|
|
dstate->setTextureAttributeAndModes(1, tex, osg::StateAttribute::ON );
|
|
|
|
dstate->setAttributeAndModes( new osg::BlendFunc, osg::StateAttribute::ON );
|
|
|
|
osg::AlphaFunc* alphaFunc = new osg::AlphaFunc;
|
|
alphaFunc->setFunction(osg::AlphaFunc::GEQUAL,0.05f);
|
|
dstate->setAttributeAndModes( alphaFunc, osg::StateAttribute::ON );
|
|
|
|
dstate->setMode( GL_LIGHTING, osg::StateAttribute::OFF );
|
|
|
|
dstate->setRenderingHint( osg::StateSet::TRANSPARENT_BIN );
|
|
}
|
|
|
|
|
|
{
|
|
osg::StateSet* stateset = new osg::StateSet;
|
|
|
|
stateset->setTextureAttributeAndModes(0, tex, osg::StateAttribute::ON );
|
|
stateset->setRenderingHint( osg::StateSet::TRANSPARENT_BIN );
|
|
|
|
{
|
|
osg::Program* program = new osg::Program;
|
|
stateset->setAttribute(program);
|
|
|
|
// get shaders from source
|
|
program->addShader(osg::Shader::readShaderFile(osg::Shader::VERTEX, osgDB::findDataFile("shaders/forest2.vert")));
|
|
program->addShader(osg::Shader::readShaderFile(osg::Shader::FRAGMENT, osgDB::findDataFile("shaders/forest2.frag")));
|
|
}
|
|
|
|
std::cout<<"Creating billboard based forest...";
|
|
scene->addChild(createShaderGraph(cell.get(),stateset));
|
|
|
|
}
|
|
#endif
|
|
|
|
return scene;
|
|
}
|
|
|
|
int main( int argc, char **argv )
|
|
{
|
|
|
|
// use an ArgumentParser object to manage the program arguments.
|
|
osg::ArgumentParser arguments(&argc,argv);
|
|
|
|
// set up the usage document, in case we need to print out how to use this program.
|
|
arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates the osg::Shape classes.");
|
|
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
|
|
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
|
|
arguments.getApplicationUsage()->addCommandLineOption("--trees <number>","Set the number of trees to create");
|
|
|
|
// construct the viewer.
|
|
osgProducer::Viewer viewer(arguments);
|
|
|
|
float numTreesToCreates = 10000;
|
|
arguments.read("--trees",numTreesToCreates);
|
|
|
|
// set up the value with sensible default event handlers.
|
|
viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
|
|
|
|
osg::ref_ptr<ForestTechniqueManager> ttm = new ForestTechniqueManager;
|
|
|
|
// get details on keyboard and mouse bindings used by the viewer.
|
|
viewer.getUsage(*arguments.getApplicationUsage());
|
|
|
|
// if user request help write it out to cout.
|
|
if (arguments.read("-h") || arguments.read("--help"))
|
|
{
|
|
arguments.getApplicationUsage()->write(std::cout);
|
|
return 1;
|
|
}
|
|
|
|
// any option left unread are converted into errors to write out later.
|
|
arguments.reportRemainingOptionsAsUnrecognized();
|
|
|
|
// report any errors if they have occured when parsing the program aguments.
|
|
if (arguments.errors())
|
|
{
|
|
arguments.writeErrorMessages(std::cout);
|
|
return 1;
|
|
}
|
|
|
|
osg::Node* node = ttm->createScene((unsigned int)numTreesToCreates);
|
|
|
|
// add model to viewer.
|
|
viewer.setSceneData( node );
|
|
|
|
// create the windows and run the threads.
|
|
viewer.realize();
|
|
|
|
// not all hardware can support vertex texturing, so check first.
|
|
for(unsigned int contextID = 0;
|
|
contextID<viewer.getDisplaySettings()->getMaxNumberOfGraphicsContexts();
|
|
++contextID)
|
|
{
|
|
osg::GL2Extensions* gl2ext = osg::GL2Extensions::Get(contextID,false);
|
|
if( gl2ext )
|
|
{
|
|
if( !gl2ext->isGlslSupported() )
|
|
{
|
|
std::cout<<"ERROR: GLSL not supported by OpenGL driver."<<std::endl;
|
|
return 1;
|
|
}
|
|
|
|
GLint numVertexTexUnits = 0;
|
|
glGetIntegerv( GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &numVertexTexUnits );
|
|
if( numVertexTexUnits <= 0 )
|
|
{
|
|
std::cout<<"ERROR: vertex texturing not supported by OpenGL driver."<<std::endl;
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
while( !viewer.done() )
|
|
{
|
|
// wait for all cull and draw threads to complete.
|
|
viewer.sync();
|
|
|
|
// update the scene by traversing it with the the update visitor which will
|
|
// call all node update callbacks and animations.
|
|
viewer.update();
|
|
|
|
// fire off the cull and draw traversals of the scene.
|
|
viewer.frame();
|
|
|
|
}
|
|
|
|
// wait for all cull and draw threads to complete before exit.
|
|
viewer.sync();
|
|
|
|
return 0;
|
|
}
|