FGFS-4.1/OpenSceneGraph
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From Mathias Froehlich,"Attached is a change to the ac3d model loader as of rev 11498, that uses

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indexed draws instead of plain array draws to save some amount of main memory.
Draw performance does not change with the nvidia binary blob as well as with
the open source drivers."
This commit is contained in:
Robert Osfield 2012-04-20 10:01:50 +00:00
parent 18b5e2a9b8
commit 45c6ba0b73
1 changed files with 79 additions and 25 deletions
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102
src/osgPlugins/ac/ac3d.cpp
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@ -6,6 +6,7 @@
#include <vector>
#include <iostream>
#include <limits>
#include <stdlib.h>
#include <osg/GL>
@ -804,6 +805,11 @@ class SurfaceBin : public PrimitiveBin {
std::vector<PolygonData> _polygons;
std::vector<PolygonData> _toTessellatePolygons;
typedef std::pair<osg::Vec3, osg::Vec3> VertexNormalPair;
typedef std::pair<VertexNormalPair, osg::Vec2> VertexNormalTexTuple;
typedef std::map<VertexNormalTexTuple, unsigned> VertexIndexMap;
VertexIndexMap _vertexIndexMap;
public:
SurfaceBin(unsigned flags, VertexSet *vertexSet) :
PrimitiveBin(flags, vertexSet)
@ -912,13 +918,65 @@ class SurfaceBin : public PrimitiveBin {
return true;
}
void pushVertex(const VertexIndex& vertexIndex, osg::Vec3Array* vertexArray,
unsigned pushVertex(const VertexIndex& vertexIndex, osg::Vec3Array* vertexArray,
osg::Vec3Array* normalArray, osg::Vec2Array* texcoordArray)
{
vertexArray->push_back(_vertexSet->getVertex(vertexIndex));
normalArray->push_back(_vertexSet->getNormal(vertexIndex));
VertexNormalTexTuple vertexNormalTexTuple;
vertexNormalTexTuple.first.first = _vertexSet->getVertex(vertexIndex);
vertexNormalTexTuple.first.second = _vertexSet->getNormal(vertexIndex);
if (texcoordArray)
texcoordArray->push_back(_vertexSet->getTexCoord(vertexIndex));
vertexNormalTexTuple.second = _vertexSet->getTexCoord(vertexIndex);
else
vertexNormalTexTuple.second = osg::Vec2(0, 0);
VertexIndexMap::iterator i = _vertexIndexMap.find(vertexNormalTexTuple);
if (i != _vertexIndexMap.end())
return i->second;
unsigned index = vertexArray->size();
vertexArray->push_back(vertexNormalTexTuple.first.first);
normalArray->push_back(vertexNormalTexTuple.first.second);
if (texcoordArray)
texcoordArray->push_back(vertexNormalTexTuple.second);
_vertexIndexMap.insert(VertexIndexMap::value_type(vertexNormalTexTuple, index));
return index;
}
osg::DrawElements* createOptimalDrawElements(osg::DrawElementsUInt* drawElements)
{
unsigned num = drawElements->getNumIndices();
unsigned maxIndex = 0;
for (unsigned i = 0; i < num; ++i)
{
maxIndex = osg::maximum(maxIndex, drawElements->getElement(i));
}
if (maxIndex <= std::numeric_limits<unsigned char>::max())
{
osg::DrawElementsUByte* drawElementsUByte = new osg::DrawElementsUByte(drawElements->getMode());
drawElementsUByte->reserveElements(num);
for (unsigned i = 0; i < num; ++i)
{
drawElementsUByte->addElement(drawElements->getElement(i));
}
return drawElementsUByte;
}
else if (maxIndex <= std::numeric_limits<unsigned short>::max())
{
osg::DrawElementsUShort* drawElementsUShort = new osg::DrawElementsUShort(drawElements->getMode());
drawElementsUShort->reserveElements(num);
for (unsigned i = 0; i < num; ++i)
{
drawElementsUShort->addElement(drawElements->getElement(i));
}
return drawElementsUShort;
}
else
{
return drawElements;
}
}
virtual osg::Geode* finalize(const MaterialData& material, const TextureData& textureData)
@ -972,18 +1030,16 @@ class SurfaceBin : public PrimitiveBin {
// At first handle the the polygons to tessellate, fix them and append the other polygons later
if (!_toTessellatePolygons.empty())
{
unsigned start = vertexArray->size();
osg::DrawArrayLengths* drawArrayLengths = new osg::DrawArrayLengths(osg::PrimitiveSet::POLYGON, start);
drawArrayLengths->reserve(_toTessellatePolygons.size());
for (unsigned i = 0; i < _toTessellatePolygons.size(); ++i)
{
osg::ref_ptr<osg::DrawElementsUInt> drawElements = new osg::DrawElementsUInt(osg::PrimitiveSet::POLYGON);
for (unsigned j = 0; j < _toTessellatePolygons[i].index.size(); ++j)
{
pushVertex(_toTessellatePolygons[i].index[j], vertexArray, normalArray, texcoordArray);
unsigned index = pushVertex(_toTessellatePolygons[i].index[j], vertexArray, normalArray, texcoordArray);
drawElements->addElement(index);
}
drawArrayLengths->push_back(_toTessellatePolygons[i].index.size());
geometry->addPrimitiveSet(createOptimalDrawElements(drawElements.get()));
}
geometry->addPrimitiveSet(drawArrayLengths);
osgUtil::Tessellator Tessellator;
Tessellator.retessellatePolygons(*geometry);
@ -992,48 +1048,46 @@ class SurfaceBin : public PrimitiveBin {
// handle triangles
if (!_triangles.empty())
{
unsigned start = vertexArray->size();
osg::ref_ptr<osg::DrawElementsUInt> drawElements = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES);
for (unsigned i = 0; i < _triangles.size(); ++i)
{
for (unsigned j = 0; j < 3; ++j)
{
pushVertex(_triangles[i].index[j], vertexArray, normalArray, texcoordArray);
unsigned index = pushVertex(_triangles[i].index[j], vertexArray, normalArray, texcoordArray);
drawElements->addElement(index);
}
}
osg::DrawArrays* drawArray = new osg::DrawArrays(osg::PrimitiveSet::TRIANGLES, start, 3*_triangles.size());
geometry->addPrimitiveSet(drawArray);
geometry->addPrimitiveSet(createOptimalDrawElements(drawElements.get()));
}
// handle quads
if (!_quads.empty())
{
unsigned start = vertexArray->size();
osg::ref_ptr<osg::DrawElementsUInt> drawElements = new osg::DrawElementsUInt(osg::PrimitiveSet::QUADS);
for (unsigned i = 0; i < _quads.size(); ++i)
{
for (unsigned j = 0; j < 4; ++j)
{
pushVertex(_quads[i].index[j], vertexArray, normalArray, texcoordArray);
unsigned index = pushVertex(_quads[i].index[j], vertexArray, normalArray, texcoordArray);
drawElements->addElement(index);
}
}
osg::DrawArrays* drawArray = new osg::DrawArrays(osg::PrimitiveSet::QUADS, start, 4*_quads.size());
geometry->addPrimitiveSet(drawArray);
geometry->addPrimitiveSet(createOptimalDrawElements(drawElements.get()));
}
// handle polygons
if (!_polygons.empty())
{
unsigned start = vertexArray->size();
osg::DrawArrayLengths* drawArrayLengths = new osg::DrawArrayLengths(osg::PrimitiveSet::POLYGON, start);
drawArrayLengths->reserve(_polygons.size());
for (unsigned i = 0; i < _polygons.size(); ++i)
{
osg::ref_ptr<osg::DrawElementsUInt> drawElements = new osg::DrawElementsUInt(osg::PrimitiveSet::POLYGON);
for (unsigned j = 0; j < _polygons[i].index.size(); ++j)
{
pushVertex(_polygons[i].index[j], vertexArray, normalArray, texcoordArray);
unsigned index = pushVertex(_polygons[i].index[j], vertexArray, normalArray, texcoordArray);
drawElements->addElement(index);
}
drawArrayLengths->push_back(_polygons[i].index.size());
geometry->addPrimitiveSet(createOptimalDrawElements(drawElements.get()));
}
geometry->addPrimitiveSet(drawArrayLengths);
}
return _geode.get();