126 lines
3.8 KiB
C++
126 lines
3.8 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
|
|
*
|
|
* This library is open source and may be redistributed and/or modified under
|
|
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
|
|
* (at your option) any later version. The full license is in LICENSE file
|
|
* included with this distribution, and on the openscenegraph.org website.
|
|
*
|
|
* This library 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
|
|
* OpenSceneGraph Public License for more details.
|
|
*/
|
|
|
|
#ifndef OSGUTIL_MESHOPTIMIZERS
|
|
#define OSGUTIL_MESHOPTIMIZERS 1
|
|
|
|
#include <set>
|
|
#include <vector>
|
|
|
|
#include <osg/Geode>
|
|
#include <osg/Geometry>
|
|
#include <osg/NodeVisitor>
|
|
|
|
#include <osgUtil/Optimizer>
|
|
|
|
namespace osgUtil
|
|
{
|
|
// Helper that collects all the unique Geometry objects in a subgraph.
|
|
class OSGUTIL_EXPORT GeometryCollector : public BaseOptimizerVisitor
|
|
{
|
|
public:
|
|
GeometryCollector(Optimizer* optimizer,
|
|
Optimizer::OptimizationOptions options)
|
|
: BaseOptimizerVisitor(optimizer, options) {}
|
|
void reset();
|
|
void apply(osg::Geometry& geom);
|
|
typedef std::set<osg::Geometry*> GeometryList;
|
|
GeometryList& getGeometryList() { return _geometryList; };
|
|
protected:
|
|
GeometryList _geometryList;
|
|
};
|
|
|
|
// Convert geometry that uses DrawArrays to DrawElements i.e.,
|
|
// construct a real mesh. This removes duplicate vertices.
|
|
class OSGUTIL_EXPORT IndexMeshVisitor : public GeometryCollector
|
|
{
|
|
public:
|
|
IndexMeshVisitor(Optimizer* optimizer = 0)
|
|
: GeometryCollector(optimizer, Optimizer::INDEX_MESH)
|
|
{
|
|
}
|
|
void makeMesh(osg::Geometry& geom);
|
|
void makeMesh();
|
|
};
|
|
|
|
// Optimize the triangle order in a mesh for best use of the GPU's
|
|
// post-transform cache. This uses Tom Forsyth's algorithm described
|
|
// at http://home.comcast.net/~tom_forsyth/papers/fast_vert_cache_opt.html
|
|
class OSGUTIL_EXPORT VertexCacheVisitor : public GeometryCollector
|
|
{
|
|
public:
|
|
VertexCacheVisitor(Optimizer* optimizer = 0)
|
|
: GeometryCollector(optimizer, Optimizer::VERTEX_POSTTRANSFORM)
|
|
{
|
|
}
|
|
|
|
void optimizeVertices(osg::Geometry& geom);
|
|
void optimizeVertices();
|
|
private:
|
|
void doVertexOptimization(osg::Geometry& geom,
|
|
std::vector<unsigned>& vertDrawList);
|
|
};
|
|
|
|
// Gather statistics on post-transform cache misses for geometry
|
|
class OSGUTIL_EXPORT VertexCacheMissVisitor : public osg::NodeVisitor
|
|
{
|
|
public:
|
|
VertexCacheMissVisitor(unsigned cacheSize = 16);
|
|
void reset();
|
|
virtual void apply(osg::Geometry& geom);
|
|
void doGeometry(osg::Geometry& geom);
|
|
unsigned misses;
|
|
unsigned triangles;
|
|
protected:
|
|
const unsigned _cacheSize;
|
|
};
|
|
|
|
// Optimize the use of the GPU pre-transform cache by arranging vertex
|
|
// attributes in the order they are used.
|
|
class OSGUTIL_EXPORT VertexAccessOrderVisitor : public GeometryCollector
|
|
{
|
|
struct OrderByPrimitiveMode
|
|
{
|
|
inline bool operator() (const osg::ref_ptr<osg::PrimitiveSet>& prim1, const osg::ref_ptr<osg::PrimitiveSet>& prim2)
|
|
{
|
|
if(prim1 && prim2) {
|
|
return prim1->getMode() > prim2->getMode();
|
|
}
|
|
else if(prim1) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
} order_by_primitive_mode;
|
|
|
|
public:
|
|
VertexAccessOrderVisitor(Optimizer* optimizer = 0)
|
|
: GeometryCollector(optimizer, Optimizer::VERTEX_PRETRANSFORM)
|
|
{
|
|
}
|
|
void optimizeOrder();
|
|
void optimizeOrder(osg::Geometry& geom);
|
|
};
|
|
|
|
class OSGUTIL_EXPORT SharedArrayOptimizer
|
|
{
|
|
public:
|
|
void findDuplicatedUVs(const osg::Geometry& geometry);
|
|
void deduplicateUVs(osg::Geometry& geometry);
|
|
protected:
|
|
std::map<unsigned int, unsigned int> _deduplicateUvs;
|
|
}; // SharedArrayOptimizer
|
|
|
|
}
|
|
#endif
|