mirror of
https://github.com/TES3MP/openmw-tes3mp.git
synced 2025-10-31 01:56:52 +00:00
398 lines
13 KiB
C++
398 lines
13 KiB
C++
#include "bulletnifloader.hpp"
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#include <vector>
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#include <BulletCollision/CollisionShapes/btBoxShape.h>
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#include <BulletCollision/CollisionShapes/btTriangleMesh.h>
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#include <BulletCollision/CollisionShapes/btScaledBvhTriangleMeshShape.h>
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#include <components/debug/debuglog.hpp>
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#include <components/misc/stringops.hpp>
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#include <components/nif/node.hpp>
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#include <components/nif/data.hpp>
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#include <components/nif/extra.hpp>
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namespace
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{
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osg::Matrixf getWorldTransform(const Nif::Node *node)
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{
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if(node->parent != nullptr)
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return node->trafo.toMatrix() * getWorldTransform(node->parent);
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return node->trafo.toMatrix();
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}
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btVector3 getbtVector(const osg::Vec3f &v)
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{
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return btVector3(v.x(), v.y(), v.z());
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}
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bool pathFileNameStartsWithX(const std::string& path)
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{
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const std::size_t slashpos = path.find_last_of("/\\");
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const std::size_t letterPos = slashpos == std::string::npos ? 0 : slashpos + 1;
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return letterPos < path.size() && (path[letterPos] == 'x' || path[letterPos] == 'X');
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}
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void fillTriangleMeshWithTransform(btTriangleMesh& mesh, const Nif::NiTriShapeData& data, const osg::Matrixf &transform)
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{
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mesh.preallocateVertices(static_cast<int>(data.vertices.size()));
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mesh.preallocateIndices(static_cast<int>(data.triangles.size()));
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const std::vector<osg::Vec3f> &vertices = data.vertices;
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const std::vector<unsigned short> &triangles = data.triangles;
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for (std::size_t i = 0; i < triangles.size(); i += 3)
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{
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mesh.addTriangle(
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getbtVector(vertices[triangles[i + 0]] * transform),
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getbtVector(vertices[triangles[i + 1]] * transform),
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getbtVector(vertices[triangles[i + 2]] * transform)
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);
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}
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}
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void fillTriangleMeshWithTransform(btTriangleMesh& mesh, const Nif::NiTriStripsData& data, const osg::Matrixf &transform)
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{
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const std::vector<osg::Vec3f> &vertices = data.vertices;
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const std::vector<std::vector<unsigned short>> &strips = data.strips;
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if (vertices.empty() || strips.empty())
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return;
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mesh.preallocateVertices(static_cast<int>(data.vertices.size()));
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int numTriangles = 0;
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for (const std::vector<unsigned short>& strip : strips)
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{
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// Each strip with N points contains information about N-2 triangles.
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if (strip.size() >= 3)
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numTriangles += static_cast<int>(strip.size()-2);
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}
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mesh.preallocateIndices(static_cast<int>(numTriangles));
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// It's triangulation time. Totally not a NifSkope spell ripoff.
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for (const std::vector<unsigned short>& strip : strips)
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{
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// Can't make a triangle from less than 3 points.
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if (strip.size() < 3)
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continue;
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unsigned short a = strip[0], b = strip[0], c = strip[1];
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for (size_t i = 2; i < strip.size(); i++)
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{
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a = b;
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b = c;
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c = strip[i];
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if (a != b && b != c && a != c)
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{
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if (i%2==0)
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{
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mesh.addTriangle(
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getbtVector(vertices[a] * transform),
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getbtVector(vertices[b] * transform),
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getbtVector(vertices[c] * transform)
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);
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}
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else
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{
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mesh.addTriangle(
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getbtVector(vertices[a] * transform),
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getbtVector(vertices[c] * transform),
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getbtVector(vertices[b] * transform)
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);
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}
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}
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}
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}
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}
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void fillTriangleMeshWithTransform(btTriangleMesh& mesh, const Nif::Node* nifNode, const osg::Matrixf &transform)
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{
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if (nifNode->recType == Nif::RC_NiTriShape)
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fillTriangleMeshWithTransform(mesh, static_cast<const Nif::NiTriShape*>(nifNode)->data.get(), transform);
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else // if (nifNode->recType == Nif::RC_NiTriStrips)
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fillTriangleMeshWithTransform(mesh, static_cast<const Nif::NiTriStrips*>(nifNode)->data.get(), transform);
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}
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void fillTriangleMesh(btTriangleMesh& mesh, const Nif::Node* node)
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{
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fillTriangleMeshWithTransform(mesh, node, osg::Matrixf());
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}
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}
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namespace NifBullet
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{
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osg::ref_ptr<Resource::BulletShape> BulletNifLoader::load(const Nif::File& nif)
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{
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mShape = new Resource::BulletShape;
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mCompoundShape.reset();
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mStaticMesh.reset();
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mAvoidStaticMesh.reset();
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Nif::Node* node = nullptr;
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const size_t numRoots = nif.numRoots();
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for (size_t i = 0; i < numRoots; ++i)
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{
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Nif::Record* r = nif.getRoot(i);
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assert(r != nullptr);
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if ((node = dynamic_cast<Nif::Node*>(r)))
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break;
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}
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if (!node)
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{
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warn("Found no root nodes in NIF.");
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return mShape;
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}
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if (findBoundingBox(node))
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{
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std::unique_ptr<btCompoundShape> compound (new btCompoundShape);
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std::unique_ptr<btBoxShape> boxShape(new btBoxShape(getbtVector(mShape->mCollisionBoxHalfExtents)));
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btTransform transform = btTransform::getIdentity();
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transform.setOrigin(getbtVector(mShape->mCollisionBoxTranslate));
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compound->addChildShape(transform, boxShape.get());
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boxShape.release();
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mShape->mCollisionShape = compound.release();
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return mShape;
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}
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else
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{
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bool autogenerated = hasAutoGeneratedCollision(node);
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// files with the name convention xmodel.nif usually have keyframes stored in a separate file xmodel.kf (see Animation::addAnimSource).
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// assume all nodes in the file will be animated
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const auto filename = nif.getFilename();
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const bool isAnimated = pathFileNameStartsWithX(filename);
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handleNode(filename, node, 0, autogenerated, isAnimated, autogenerated);
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if (mCompoundShape)
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{
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if (mStaticMesh)
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{
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btTransform trans;
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trans.setIdentity();
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std::unique_ptr<btCollisionShape> child(new Resource::TriangleMeshShape(mStaticMesh.get(), true));
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mCompoundShape->addChildShape(trans, child.get());
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child.release();
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mStaticMesh.release();
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}
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mShape->mCollisionShape = mCompoundShape.release();
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}
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else if (mStaticMesh)
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{
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mShape->mCollisionShape = new Resource::TriangleMeshShape(mStaticMesh.get(), true);
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mStaticMesh.release();
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}
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if (mAvoidStaticMesh)
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{
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mShape->mAvoidCollisionShape = new Resource::TriangleMeshShape(mAvoidStaticMesh.get(), false);
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mAvoidStaticMesh.release();
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}
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return mShape;
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}
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}
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// Find a boundingBox in the node hierarchy.
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// Return: use bounding box for collision?
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bool BulletNifLoader::findBoundingBox(const Nif::Node* node)
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{
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if (node->hasBounds)
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{
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mShape->mCollisionBoxHalfExtents = node->boundXYZ;
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mShape->mCollisionBoxTranslate = node->boundPos;
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if (node->flags & Nif::NiNode::Flag_BBoxCollision)
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{
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return true;
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}
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}
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const Nif::NiNode *ninode = dynamic_cast<const Nif::NiNode*>(node);
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if(ninode)
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{
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const Nif::NodeList &list = ninode->children;
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for(size_t i = 0;i < list.length();i++)
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{
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if(!list[i].empty())
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{
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bool found = findBoundingBox (list[i].getPtr());
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if (found)
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return true;
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}
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}
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}
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return false;
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}
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bool BulletNifLoader::hasAutoGeneratedCollision(const Nif::Node* rootNode)
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{
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const Nif::NiNode *ninode = dynamic_cast<const Nif::NiNode*>(rootNode);
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if(ninode)
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{
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const Nif::NodeList &list = ninode->children;
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for(size_t i = 0;i < list.length();i++)
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{
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if(!list[i].empty())
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{
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if(list[i].getPtr()->recType == Nif::RC_RootCollisionNode)
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return false;
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}
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}
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}
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return true;
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}
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void BulletNifLoader::handleNode(const std::string& fileName, const Nif::Node *node, int flags,
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bool isCollisionNode, bool isAnimated, bool autogenerated, bool avoid)
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{
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// TODO: allow on-the fly collision switching via toggling this flag
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if (node->recType == Nif::RC_NiCollisionSwitch && !(node->flags & Nif::NiNode::Flag_ActiveCollision))
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return;
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// Accumulate the flags from all the child nodes. This works for all
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// the flags we currently use, at least.
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flags |= node->flags;
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if (!node->controller.empty() && node->controller->recType == Nif::RC_NiKeyframeController
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&& (node->controller->flags & Nif::NiNode::ControllerFlag_Active))
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isAnimated = true;
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isCollisionNode = isCollisionNode || (node->recType == Nif::RC_RootCollisionNode);
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// Don't collide with AvoidNode shapes
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avoid = avoid || (node->recType == Nif::RC_AvoidNode);
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// We encountered a RootCollisionNode inside autogenerated mesh. It is not right.
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if (node->recType == Nif::RC_RootCollisionNode && autogenerated)
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Log(Debug::Info) << "RootCollisionNode is not attached to the root node in " << fileName << ". Treating it as a common NiTriShape.";
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// Check for extra data
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for (Nif::ExtraPtr e = node->extra; !e.empty(); e = e->next)
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{
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if (e->recType == Nif::RC_NiStringExtraData)
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{
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// String markers may contain important information
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// affecting the entire subtree of this node
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Nif::NiStringExtraData *sd = (Nif::NiStringExtraData*)e.getPtr();
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if (Misc::StringUtils::ciCompareLen(sd->string, "NC", 2) == 0)
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{
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// No collision. Use an internal flag setting to mark this.
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flags |= 0x800;
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}
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else if (sd->string == "MRK" && autogenerated)
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{
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// Marker can still have collision if the model explicitely specifies it via a RootCollisionNode.
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return;
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}
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}
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}
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if (isCollisionNode)
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{
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// NOTE: a trishape with hasBounds=true, but no BBoxCollision flag should NOT go through handleNiTriShape!
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// It must be ignored completely.
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// (occurs in tr_ex_imp_wall_arch_04.nif)
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if(!node->hasBounds && (node->recType == Nif::RC_NiTriShape || node->recType == Nif::RC_NiTriStrips))
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{
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handleNiTriShape(node, flags, getWorldTransform(node), isAnimated, avoid);
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}
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}
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// For NiNodes, loop through children
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const Nif::NiNode *ninode = dynamic_cast<const Nif::NiNode*>(node);
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if(ninode)
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{
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const Nif::NodeList &list = ninode->children;
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for(size_t i = 0;i < list.length();i++)
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{
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if(!list[i].empty())
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handleNode(fileName, list[i].getPtr(), flags, isCollisionNode, isAnimated, autogenerated, avoid);
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}
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}
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}
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void BulletNifLoader::handleNiTriShape(const Nif::Node *nifNode, int flags, const osg::Matrixf &transform,
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bool isAnimated, bool avoid)
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{
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assert(nifNode != nullptr);
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// If the object was marked "NCO" earlier, it shouldn't collide with
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// anything. So don't do anything.
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if ((flags & 0x800))
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return;
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if (nifNode->recType == Nif::RC_NiTriShape)
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{
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const Nif::NiTriShape* shape = static_cast<const Nif::NiTriShape*>(nifNode);
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if (!shape->skin.empty())
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isAnimated = false;
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if (shape->data.empty() || shape->data->triangles.empty())
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return;
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}
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else
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{
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const Nif::NiTriStrips* shape = static_cast<const Nif::NiTriStrips*>(nifNode);
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if (!shape->skin.empty())
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isAnimated = false;
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if (shape->data.empty() || shape->data->strips.empty())
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return;
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}
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if (isAnimated)
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{
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if (!mCompoundShape)
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mCompoundShape.reset(new btCompoundShape);
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std::unique_ptr<btTriangleMesh> childMesh(new btTriangleMesh);
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fillTriangleMesh(*childMesh, nifNode);
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std::unique_ptr<Resource::TriangleMeshShape> childShape(new Resource::TriangleMeshShape(childMesh.get(), true));
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childMesh.release();
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float scale = nifNode->trafo.scale;
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const Nif::Node* parent = nifNode;
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while (parent->parent)
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{
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parent = parent->parent;
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scale *= parent->trafo.scale;
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}
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osg::Quat q = transform.getRotate();
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osg::Vec3f v = transform.getTrans();
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childShape->setLocalScaling(btVector3(scale, scale, scale));
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btTransform trans(btQuaternion(q.x(), q.y(), q.z(), q.w()), btVector3(v.x(), v.y(), v.z()));
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mShape->mAnimatedShapes.emplace(nifNode->recIndex, mCompoundShape->getNumChildShapes());
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mCompoundShape->addChildShape(trans, childShape.get());
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childShape.release();
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}
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else if (avoid)
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{
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if (!mAvoidStaticMesh)
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mAvoidStaticMesh.reset(new btTriangleMesh(false));
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fillTriangleMeshWithTransform(*mAvoidStaticMesh, nifNode, transform);
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}
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else
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{
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if (!mStaticMesh)
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mStaticMesh.reset(new btTriangleMesh(false));
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// Static shape, just transform all vertices into position
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fillTriangleMeshWithTransform(*mStaticMesh, nifNode, transform);
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}
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}
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} // namespace NifBullet
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