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#include "bulletshapemanager.hpp"
#include <cstring>
#include <osg/Drawable>
#include <osg/NodeVisitor>
#include <osg/Transform>
#include <osg/TriangleFunctor>
#include <BulletCollision/CollisionShapes/btTriangleMesh.h>
#include <components/misc/osguservalues.hpp>
#include <components/misc/pathhelpers.hpp>
#include <components/sceneutil/visitor.hpp>
#include <components/vfs/manager.hpp>
#include <components/vfs/pathutil.hpp>
#include <components/nifbullet/bulletnifloader.hpp>
#include "bulletshape.hpp"
#include "multiobjectcache.hpp"
#include "niffilemanager.hpp"
#include "objectcache.hpp"
#include "scenemanager.hpp"
namespace Resource
{
struct GetTriangleFunctor
{
GetTriangleFunctor()
: mTriMesh(nullptr)
{
}
void setTriMesh(btTriangleMesh* triMesh) { mTriMesh = triMesh; }
void setMatrix(const osg::Matrixf& matrix) { mMatrix = matrix; }
inline btVector3 toBullet(const osg::Vec3f& vec) { return btVector3(vec.x(), vec.y(), vec.z()); }
void inline operator()(const osg::Vec3& v1, const osg::Vec3& v2, const osg::Vec3& v3,
bool _temp = false) // Note: unused temp argument left here for OSG versions less than 3.5.6
{
if (mTriMesh)
mTriMesh->addTriangle(
toBullet(mMatrix.preMult(v1)), toBullet(mMatrix.preMult(v2)), toBullet(mMatrix.preMult(v3)));
}
btTriangleMesh* mTriMesh;
osg::Matrixf mMatrix;
};
/// Creates a BulletShape out of a Node hierarchy.
class NodeToShapeVisitor : public osg::NodeVisitor
{
public:
NodeToShapeVisitor()
: osg::NodeVisitor(TRAVERSE_ALL_CHILDREN)
, mTriangleMesh(nullptr)
{
}
void apply(osg::Drawable& drawable) override
{
if (!mTriangleMesh)
mTriangleMesh.reset(new btTriangleMesh);
osg::Matrixf worldMat = osg::computeLocalToWorld(getNodePath());
osg::TriangleFunctor<GetTriangleFunctor> functor;
functor.setTriMesh(mTriangleMesh.get());
functor.setMatrix(worldMat);
drawable.accept(functor);
}
osg::ref_ptr<BulletShape> getShape()
{
if (!mTriangleMesh || mTriangleMesh->getNumTriangles() == 0)
return osg::ref_ptr<BulletShape>();
osg::ref_ptr<BulletShape> shape(new BulletShape);
auto triangleMeshShape = std::make_unique<TriangleMeshShape>(mTriangleMesh.release(), true);
btVector3 aabbMin = triangleMeshShape->getLocalAabbMin();
btVector3 aabbMax = triangleMeshShape->getLocalAabbMax();
shape->mCollisionBox.mExtents[0] = (aabbMax[0] - aabbMin[0]) / 2.0f;
shape->mCollisionBox.mExtents[1] = (aabbMax[1] - aabbMin[1]) / 2.0f;
shape->mCollisionBox.mExtents[2] = (aabbMax[2] - aabbMin[2]) / 2.0f;
shape->mCollisionBox.mCenter = osg::Vec3f(
(aabbMax[0] + aabbMin[0]) / 2.0f, (aabbMax[1] + aabbMin[1]) / 2.0f, (aabbMax[2] + aabbMin[2]) / 2.0f);
shape->mCollisionShape.reset(triangleMeshShape.release());
return shape;
}
private:
std::unique_ptr<btTriangleMesh> mTriangleMesh;
};
BulletShapeManager::BulletShapeManager(
const VFS::Manager* vfs, SceneManager* sceneMgr, NifFileManager* nifFileManager, double expiryDelay)
: ResourceManager(vfs, expiryDelay)
, mInstanceCache(new MultiObjectCache)
, mSceneManager(sceneMgr)
, mNifFileManager(nifFileManager)
{
}
BulletShapeManager::~BulletShapeManager() = default;
osg::ref_ptr<const BulletShape> BulletShapeManager::getShape(VFS::Path::NormalizedView name)
{
if (osg::ref_ptr<osg::Object> obj = mCache->getRefFromObjectCache(name))
return osg::ref_ptr<BulletShape>(static_cast<BulletShape*>(obj.get()));
osg::ref_ptr<BulletShape> shape;
if (Misc::getFileExtension(name.value()) == "nif")
{
NifBullet::BulletNifLoader loader;
shape = loader.load(*mNifFileManager->get(name));
}
else
{
// TODO: support .bullet shape files
osg::ref_ptr<const osg::Node> constNode(mSceneManager->getTemplate(name));
// const-trickery required because there is no const version of NodeVisitor
osg::ref_ptr<osg::Node> node(const_cast<osg::Node*>(constNode.get()));
// Check first if there's a custom collision node
unsigned int visitAllNodesMask = 0xffffffff;
SceneUtil::FindByNameVisitor nameFinder("Collision");
nameFinder.setTraversalMask(visitAllNodesMask);
nameFinder.setNodeMaskOverride(visitAllNodesMask);
node->accept(nameFinder);
if (nameFinder.mFoundNode)
{
NodeToShapeVisitor visitor;
visitor.setTraversalMask(visitAllNodesMask);
visitor.setNodeMaskOverride(visitAllNodesMask);
nameFinder.mFoundNode->accept(visitor);
shape = visitor.getShape();
}
// Generate a collision shape from the mesh
if (!shape)
{
NodeToShapeVisitor visitor;
node->accept(visitor);
shape = visitor.getShape();
if (!shape)
return osg::ref_ptr<BulletShape>();
}
if (shape != nullptr)
{
shape->mFileName = name;
constNode->getUserValue(Misc::OsgUserValues::sFileHash, shape->mFileHash);
}
}
mCache->addEntryToObjectCache(name.value(), shape);
return shape;
}
osg::ref_ptr<BulletShapeInstance> BulletShapeManager::cacheInstance(VFS::Path::NormalizedView name)
{
osg::ref_ptr<BulletShapeInstance> instance = createInstance(name);
if (instance != nullptr)
mInstanceCache->addEntryToObjectCache(name, instance.get());
return instance;
}
osg::ref_ptr<BulletShapeInstance> BulletShapeManager::getInstance(VFS::Path::NormalizedView name)
{
if (osg::ref_ptr<osg::Object> obj = mInstanceCache->takeFromObjectCache(name))
return static_cast<BulletShapeInstance*>(obj.get());
return createInstance(name);
}
osg::ref_ptr<BulletShapeInstance> BulletShapeManager::createInstance(VFS::Path::NormalizedView name)
{
if (osg::ref_ptr<const BulletShape> shape = getShape(name))
return makeInstance(std::move(shape));
return osg::ref_ptr<BulletShapeInstance>();
}
void BulletShapeManager::updateCache(double referenceTime)
{
ResourceManager::updateCache(referenceTime);
mInstanceCache->removeUnreferencedObjectsInCache();
}
void BulletShapeManager::clearCache()
{
ResourceManager::clearCache();
mInstanceCache->clear();
}
void BulletShapeManager::reportStats(unsigned int frameNumber, osg::Stats* stats) const
{
Resource::reportStats("Shape", frameNumber, mCache->getStats(), *stats);
Resource::reportStats("Shape Instance", frameNumber, mInstanceCache->getStats(), *stats);
}
}
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