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spt: Expose the paging levels to osg options.

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The levels at which page nodes are built is exposed by an
osg database pager option SimGear::SPT_PAGE_LEVELS which could
contain a blank separated list of levels where paging occurs.
Also the database pagers paths are searched for static lower
level of detail tiles in case they are available.
This commit is contained in:
Mathias Froehlich
2013-02-24 13:03:06 +01:00
parent fafa70c6bc
commit 2ae7fc244b
2 changed files with 95 additions and 33 deletions
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118
simgear/scene/tgdb/ReaderWriterSPT.cxx
View File

@@ -111,6 +111,58 @@ struct ReaderWriterSPT::CullCallback : public osg::NodeCallback {
}
};
struct ReaderWriterSPT::LocalOptions {
LocalOptions(const osgDB::Options* options) :
_options(options)
{
std::string pageLevelsString;
if (_options)
pageLevelsString = _options->getPluginStringData("SimGear::SPT_PAGE_LEVELS");
// Get the default if nothing given from outside
if (pageLevelsString.empty()) {
// We want an other level of indirection for paging
// Here we get about 12x12 deg tiles
_pageLevels.push_back(3);
// We want an other level of indirection for paging
// Here we get about 2x2 deg tiles
_pageLevels.push_back(5);
// We want an other level of indirection for paging
// Here we get about 0.5x0.5 deg tiles
_pageLevels.push_back(7);
} else {
// If configured from outside
std::stringstream ss(pageLevelsString);
while (ss.good()) {
unsigned level = ~0u;
ss >> level;
_pageLevels.push_back(level);
}
}
}
bool isPageLevel(unsigned level) const
{
return std::find(_pageLevels.begin(), _pageLevels.end(), level) != _pageLevels.end();
}
std::string getLodPathForBucketBox(const BucketBox& bucketBox) const
{
std::stringstream ss;
ss << "LOD/";
for (std::vector<unsigned>::const_iterator i = _pageLevels.begin(); i != _pageLevels.end(); ++i) {
if (bucketBox.getStartLevel() <= *i)
break;
ss << bucketBox.getParentBox(*i) << "/";
}
ss << bucketBox;
return ss.str();
}
const osgDB::Options* _options;
std::vector<unsigned> _pageLevels;
};
ReaderWriterSPT::ReaderWriterSPT()
{
supportsExtension("spt", "SimGear paged terrain meta database.");
@@ -160,10 +212,12 @@ ReaderWriterSPT::readObject(const std::string& fileName, const osgDB::Options* o
osgDB::ReaderWriter::ReadResult
ReaderWriterSPT::readNode(const std::string& fileName, const osgDB::Options* options) const
{
LocalOptions localOptions(options);
// The file name without path and without the spt extension
std::string strippedFileName = osgDB::getStrippedName(fileName);
if (strippedFileName == "earth")
return ReadResult(createTree(BucketBox(-180, -90, 360, 180), options, true));
return ReadResult(createTree(BucketBox(-180, -90, 360, 180), localOptions, true));
std::stringstream ss(strippedFileName);
BucketBox bucketBox;
@@ -177,33 +231,23 @@ ReaderWriterSPT::readNode(const std::string& fileName, const osgDB::Options* opt
return ReadResult::FILE_NOT_FOUND;
if (bucketBoxListSize == 1)
return ReadResult(createTree(bucketBoxList[0], options, true));
return ReadResult(createTree(bucketBoxList[0], localOptions, true));
assert(bucketBoxListSize == 2);
osg::ref_ptr<osg::Group> group = new osg::Group;
group->addChild(createTree(bucketBoxList[0], options, true));
group->addChild(createTree(bucketBoxList[1], options, true));
group->addChild(createTree(bucketBoxList[0], localOptions, true));
group->addChild(createTree(bucketBoxList[1], localOptions, true));
return ReadResult(group);
}
osg::ref_ptr<osg::Node>
ReaderWriterSPT::createTree(const BucketBox& bucketBox, const osgDB::Options* options, bool topLevel) const
ReaderWriterSPT::createTree(const BucketBox& bucketBox, const LocalOptions& options, bool topLevel) const
{
if (bucketBox.getIsBucketSize()) {
std::string fileName;
fileName = bucketBox.getBucket().gen_index_str() + std::string(".stg");
return osgDB::readRefNodeFile(fileName, options);
} else if (!topLevel && bucketBox.getStartLevel() == 3) {
// We want an other level of indirection for paging
// Here we get about 12x12 deg tiles
return createPagedLOD(bucketBox, options);
} else if (!topLevel && bucketBox.getStartLevel() == 5) {
// We want an other level of indirection for paging
// Here we get about 2x2 deg tiles
return createPagedLOD(bucketBox, options);
} else if (!topLevel && bucketBox.getStartLevel() == 7) {
// We want an other level of indirection for paging
// Here we get about 0.5x0.5 deg tiles
return osgDB::readRefNodeFile(fileName, options._options);
} else if (!topLevel && options.isPageLevel(bucketBox.getStartLevel())) {
return createPagedLOD(bucketBox, options);
} else {
BucketBox bucketBoxList[100];
@@ -229,7 +273,7 @@ ReaderWriterSPT::createTree(const BucketBox& bucketBox, const osgDB::Options* op
}
osg::ref_ptr<osg::Node>
ReaderWriterSPT::createPagedLOD(const BucketBox& bucketBox, const osgDB::Options* options) const
ReaderWriterSPT::createPagedLOD(const BucketBox& bucketBox, const LocalOptions& options) const
{
osg::PagedLOD* pagedLOD = new osg::PagedLOD;
@@ -241,20 +285,36 @@ ReaderWriterSPT::createPagedLOD(const BucketBox& bucketBox, const osgDB::Options
pagedLOD->setCullCallback(new CullCallback);
osg::ref_ptr<osgDB::Options> localOptions;
localOptions = static_cast<osgDB::Options*>(options->clone(osg::CopyOp()));
localOptions = static_cast<osgDB::Options*>(options._options->clone(osg::CopyOp()));
// FIXME:
// The particle systems have nodes with culling disabled.
// PagedLOD nodes with childnodes like this will never expire.
// So, for now switch them off.
localOptions->setPluginStringData("SimGear::PARTICLESYSTEM", "OFF");
pagedLOD->setDatabaseOptions(localOptions.get());
float range = 3*sphere.getRadius();
// Add the static sea level textured shell
osg::ref_ptr<osg::Node> tile = createSeaLevelTile(bucketBox, options);
if (tile.valid())
pagedLOD->addChild(tile.get(), range, std::numeric_limits<float>::max());
// The break point for the low level of detail to the high level of detail
float range = 2*sphere.getRadius();
// Look for a low level of detail tile
std::string lodPath = options.getLodPathForBucketBox(bucketBox);
const char* extensions[] = { ".btg.gz", ".flt" };
for (unsigned i = 0; i < sizeof(extensions)/sizeof(extensions[0]); ++i) {
std::string fileName = osgDB::findDataFile(lodPath + extensions[i], options._options);
if (fileName.empty())
continue;
osg::ref_ptr<osg::Node> node = osgDB::readRefNodeFile(fileName, options._options);
if (!node.valid())
continue;
pagedLOD->addChild(node.get(), range, std::numeric_limits<float>::max());
break;
}
// Add the static sea level textured shell if there is nothing found
if (pagedLOD->getNumChildren() == 0) {
osg::ref_ptr<osg::Node> node = createSeaLevelTile(bucketBox, options._options);
if (node.valid())
pagedLOD->addChild(node.get(), range, std::numeric_limits<float>::max());
}
// Add the paged file name that creates the subtrees on demand
std::stringstream ss;
@@ -266,9 +326,9 @@ ReaderWriterSPT::createPagedLOD(const BucketBox& bucketBox, const osgDB::Options
}
osg::ref_ptr<osg::Node>
ReaderWriterSPT::createSeaLevelTile(const BucketBox& bucketBox, const osgDB::Options* options) const
ReaderWriterSPT::createSeaLevelTile(const BucketBox& bucketBox, const LocalOptions& options) const
{
if (options->getPluginStringData("SimGear::FG_EARTH") != "ON")
if (options._options->getPluginStringData("SimGear::FG_EARTH") != "ON")
return 0;
SGSpheref sphere = bucketBox.getBoundingSphere();
@@ -335,10 +395,10 @@ ReaderWriterSPT::createSeaLevelTile(const BucketBox& bucketBox, const osgDB::Opt
}
osg::ref_ptr<osg::StateSet>
ReaderWriterSPT::getLowLODStateSet(const osgDB::Options* options) const
ReaderWriterSPT::getLowLODStateSet(const LocalOptions& options) const
{
osg::ref_ptr<osgDB::Options> localOptions;
localOptions = static_cast<osgDB::Options*>(options->clone(osg::CopyOp()));
localOptions = static_cast<osgDB::Options*>(options._options->clone(osg::CopyOp()));
localOptions->setObjectCacheHint(osgDB::Options::CACHE_ALL);
osg::ref_ptr<osg::Object> object = osgDB::readRefObjectFile("state.spt", localOptions.get());

10
simgear/scene/tgdb/ReaderWriterSPT.hxx
View File

@@ -37,10 +37,12 @@ public:
virtual osgDB::ReaderWriter::ReadResult readNode(const std::string& fileName, const osgDB::Options* options) const;
protected:
osg::ref_ptr<osg::Node> createTree(const BucketBox& bucketBox, const osgDB::Options* options, bool topLevel) const;
osg::ref_ptr<osg::Node> createPagedLOD(const BucketBox& bucketBox, const osgDB::Options* options) const;
osg::ref_ptr<osg::Node> createSeaLevelTile(const BucketBox& bucketBox, const osgDB::Options* options) const;
osg::ref_ptr<osg::StateSet> getLowLODStateSet(const osgDB::Options* options) const;
struct LocalOptions;
osg::ref_ptr<osg::Node> createTree(const BucketBox& bucketBox, const LocalOptions& options, bool topLevel) const;
osg::ref_ptr<osg::Node> createPagedLOD(const BucketBox& bucketBox, const LocalOptions& options) const;
osg::ref_ptr<osg::Node> createSeaLevelTile(const BucketBox& bucketBox, const LocalOptions& options) const;
osg::ref_ptr<osg::StateSet> getLowLODStateSet(const LocalOptions& options) const;
private:
struct CullCallback;