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https://github.com/OpenMW/openmw.git
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620 lines
23 KiB
C++
620 lines
23 KiB
C++
#include "quadtreeworld.hpp"
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#include <osg/Material>
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#include <osg/PolygonMode>
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#include <osg/ShapeDrawable>
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#include <osgUtil/CullVisitor>
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#include <limits>
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#include <components/loadinglistener/reporter.hpp>
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#include <components/misc/constants.hpp>
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#include <components/misc/mathutil.hpp>
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#include <components/resource/resourcesystem.hpp>
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#include <components/sceneutil/positionattitudetransform.hpp>
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#include "chunkmanager.hpp"
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#include "compositemaprenderer.hpp"
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#include "heightcull.hpp"
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#include "quadtreenode.hpp"
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#include "storage.hpp"
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#include "terraindrawable.hpp"
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#include "viewdata.hpp"
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namespace
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{
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unsigned int Log2(unsigned int n)
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{
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unsigned int targetlevel = 0;
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while (n >>= 1)
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++targetlevel;
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return targetlevel;
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}
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}
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namespace Terrain
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{
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class DefaultLodCallback : public LodCallback
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{
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public:
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DefaultLodCallback(
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float factor, float minSize, float viewDistance, const osg::Vec4i& grid, float distanceModifier = 0.f)
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: mFactor(factor)
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, mMinSize(minSize)
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, mViewDistance(viewDistance)
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, mActiveGrid(grid)
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, mDistanceModifier(distanceModifier)
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{
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}
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ReturnValue isSufficientDetail(QuadTreeNode* node, float dist) override
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{
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const osg::Vec2f& center = node->getCenter();
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bool activeGrid = (center.x() > mActiveGrid.x() && center.y() > mActiveGrid.y()
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&& center.x() < mActiveGrid.z() && center.y() < mActiveGrid.w());
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if (node->getSize() > 1)
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{
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float halfSize = node->getSize() / 2;
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osg::Vec4i nodeBounds(static_cast<int>(center.x() - halfSize), static_cast<int>(center.y() - halfSize),
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static_cast<int>(center.x() + halfSize), static_cast<int>(center.y() + halfSize));
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bool intersects = (std::max(nodeBounds.x(), mActiveGrid.x()) < std::min(nodeBounds.z(), mActiveGrid.z())
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&& std::max(nodeBounds.y(), mActiveGrid.y()) < std::min(nodeBounds.w(), mActiveGrid.w()));
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// to prevent making chunks who will cross the activegrid border
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if (intersects)
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return Deeper;
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}
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dist = std::max(0.f, dist + mDistanceModifier);
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if (dist > mViewDistance && !activeGrid) // for Scene<->ObjectPaging sync the activegrid must remain loaded
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return StopTraversal;
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return getNativeLodLevel(node, mMinSize) <= convertDistanceToLodLevel(dist, mMinSize, mFactor)
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? StopTraversalAndUse
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: Deeper;
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}
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static unsigned int getNativeLodLevel(const QuadTreeNode* node, float minSize)
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{
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return Log2(static_cast<unsigned int>(node->getSize() / minSize));
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}
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static unsigned int convertDistanceToLodLevel(float dist, float minSize, float factor)
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{
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return Log2(static_cast<unsigned int>(dist / (Constants::CellSizeInUnits * minSize * factor)));
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}
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private:
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float mFactor;
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float mMinSize;
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float mViewDistance;
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osg::Vec4i mActiveGrid;
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float mDistanceModifier;
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};
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class RootNode : public QuadTreeNode
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{
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public:
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RootNode(float size, const osg::Vec2f& center)
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: QuadTreeNode(nullptr, Root, size, center)
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, mWorld(nullptr)
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{
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}
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void setWorld(QuadTreeWorld* world) { mWorld = world; }
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void accept(osg::NodeVisitor& nv) override
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{
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if (!nv.validNodeMask(*this))
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return;
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nv.pushOntoNodePath(this);
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mWorld->accept(nv);
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nv.popFromNodePath();
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}
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private:
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QuadTreeWorld* mWorld;
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};
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class QuadTreeBuilder
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{
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public:
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QuadTreeBuilder(Terrain::Storage* storage, float minSize)
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: mStorage(storage)
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, mMinX(0.f)
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, mMaxX(0.f)
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, mMinY(0.f)
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, mMaxY(0.f)
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, mMinSize(minSize)
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{
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}
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void build()
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{
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mStorage->getBounds(mMinX, mMaxX, mMinY, mMaxY);
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int origSizeX = static_cast<int>(mMaxX - mMinX);
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int origSizeY = static_cast<int>(mMaxY - mMinY);
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// Dividing a quad tree only works well for powers of two, so round up to the nearest one
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int size = Misc::nextPowerOfTwo(std::max(origSizeX, origSizeY));
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float centerX = (mMinX + mMaxX) / 2.f + (size - origSizeX) / 2.f;
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float centerY = (mMinY + mMaxY) / 2.f + (size - origSizeY) / 2.f;
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mRootNode = new RootNode(size, osg::Vec2f(centerX, centerY));
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addChildren(mRootNode);
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mRootNode->initNeighbours();
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float cellWorldSize = mStorage->getCellWorldSize();
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mRootNode->setInitialBound(
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osg::BoundingSphere(osg::BoundingBox(osg::Vec3(mMinX * cellWorldSize, mMinY * cellWorldSize, 0),
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osg::Vec3(mMaxX * cellWorldSize, mMaxY * cellWorldSize, 0))));
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}
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void addChildren(QuadTreeNode* parent)
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{
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float halfSize = parent->getSize() / 2.f;
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osg::BoundingBox boundingBox;
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for (unsigned int i = 0; i < 4; ++i)
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{
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osg::ref_ptr<QuadTreeNode> child = addChild(parent, static_cast<ChildDirection>(i), halfSize);
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if (child)
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{
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boundingBox.expandBy(child->getBoundingBox());
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parent->addChildNode(child);
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}
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}
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if (!boundingBox.valid())
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parent->removeChildren(0, 4);
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else
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parent->setBoundingBox(boundingBox);
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}
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osg::ref_ptr<QuadTreeNode> addChild(QuadTreeNode* parent, ChildDirection direction, float size)
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{
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float halfSize = size / 2.f;
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osg::Vec2f center;
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switch (direction)
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{
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case SW:
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center = parent->getCenter() + osg::Vec2f(-halfSize, -halfSize);
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break;
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case SE:
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center = parent->getCenter() + osg::Vec2f(halfSize, -halfSize);
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break;
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case NW:
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center = parent->getCenter() + osg::Vec2f(-halfSize, halfSize);
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break;
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case NE:
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center = parent->getCenter() + osg::Vec2f(halfSize, halfSize);
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break;
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default:
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break;
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}
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osg::ref_ptr<QuadTreeNode> node = new QuadTreeNode(parent, direction, size, center);
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if (center.x() - halfSize > mMaxX || center.x() + halfSize < mMinX || center.y() - halfSize > mMaxY
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|| center.y() + halfSize < mMinY)
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// Out of bounds of the actual terrain - this will happen because
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// we rounded the size up to the next power of two
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{
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// Still create and return an empty node so as to not break the assumption that each QuadTreeNode has
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// either 4 or 0 children.
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return node;
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}
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// Do not add child nodes for default cells without data.
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// size = 1 means that the single shape covers the whole cell.
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if (node->getSize() == 1 && !mStorage->hasData(center.x() - 0.5, center.y() - 0.5))
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return node;
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if (node->getSize() <= mMinSize)
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{
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// We arrived at a leaf.
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// Since the tree is used for LOD level selection instead of culling, we do not need to load the actual
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// height data here.
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constexpr float minZ = -std::numeric_limits<float>::max();
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constexpr float maxZ = std::numeric_limits<float>::max();
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float cellWorldSize = mStorage->getCellWorldSize();
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osg::BoundingBox boundingBox(
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osg::Vec3f((center.x() - halfSize) * cellWorldSize, (center.y() - halfSize) * cellWorldSize, minZ),
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osg::Vec3f((center.x() + halfSize) * cellWorldSize, (center.y() + halfSize) * cellWorldSize, maxZ));
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node->setBoundingBox(boundingBox);
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return node;
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}
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else
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{
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addChildren(node);
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return node;
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}
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}
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osg::ref_ptr<RootNode> getRootNode() { return mRootNode; }
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private:
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Terrain::Storage* mStorage;
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float mMinX, mMaxX, mMinY, mMaxY;
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float mMinSize;
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osg::ref_ptr<RootNode> mRootNode;
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};
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class DebugChunkManager : public QuadTreeWorld::ChunkManager
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{
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public:
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DebugChunkManager(Resource::SceneManager* sceneManager, Storage* storage, unsigned int nodeMask)
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: mSceneManager(sceneManager)
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, mStorage(storage)
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, mNodeMask(nodeMask)
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{
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}
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osg::ref_ptr<osg::Node> getChunk(float size, const osg::Vec2f& chunkCenter, unsigned char lod,
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unsigned int lodFlags, bool activeGrid, const osg::Vec3f& viewPoint, bool compile)
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{
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osg::Vec3f center = { chunkCenter.x(), chunkCenter.y(), 0 };
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auto chunkBorder = CellBorder::createBorderGeometry(center.x() - size / 2.f, center.y() - size / 2.f, size,
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mStorage, mSceneManager, mNodeMask, 5.f, { 1, 0, 0, 0 });
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osg::ref_ptr<SceneUtil::PositionAttitudeTransform> pat = new SceneUtil::PositionAttitudeTransform;
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pat->setPosition(-center * Constants::CellSizeInUnits);
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pat->addChild(chunkBorder);
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return pat;
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}
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unsigned int getNodeMask() { return mNodeMask; }
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private:
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Resource::SceneManager* mSceneManager;
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Storage* mStorage;
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unsigned int mNodeMask;
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};
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QuadTreeWorld::QuadTreeWorld(osg::Group* parent, osg::Group* compileRoot, Resource::ResourceSystem* resourceSystem,
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Storage* storage, unsigned int nodeMask, unsigned int preCompileMask, unsigned int borderMask,
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int compMapResolution, float compMapLevel, float lodFactor, int vertexLodMod, float maxCompGeometrySize,
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bool debugChunks)
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: TerrainGrid(parent, compileRoot, resourceSystem, storage, nodeMask, preCompileMask, borderMask)
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, mViewDataMap(new ViewDataMap)
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, mQuadTreeBuilt(false)
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, mLodFactor(lodFactor)
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, mVertexLodMod(vertexLodMod)
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, mViewDistance(std::numeric_limits<float>::max())
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, mMinSize(1 / 8.f)
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, mDebugTerrainChunks(debugChunks)
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{
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mChunkManager->setCompositeMapSize(compMapResolution);
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mChunkManager->setCompositeMapLevel(compMapLevel);
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mChunkManager->setMaxCompositeGeometrySize(maxCompGeometrySize);
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mChunkManagers.push_back(mChunkManager.get());
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if (mDebugTerrainChunks)
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{
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mDebugChunkManager
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= std::make_unique<DebugChunkManager>(mResourceSystem->getSceneManager(), mStorage, borderMask);
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addChunkManager(mDebugChunkManager.get());
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}
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}
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QuadTreeWorld::~QuadTreeWorld() {}
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/// get the level of vertex detail to render this node at, expressed relative to the native resolution of the vertex
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/// data set, NOT relative to mMinSize as is the case with node LODs.
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unsigned int getVertexLod(QuadTreeNode* node, int vertexLodMod)
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{
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unsigned int vertexLod = DefaultLodCallback::getNativeLodLevel(node, 1);
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if (vertexLodMod > 0)
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{
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vertexLod = static_cast<unsigned int>(std::max(0, static_cast<int>(vertexLod) - vertexLodMod));
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}
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else if (vertexLodMod < 0)
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{
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float size = node->getSize();
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// Stop to simplify at this level since with size = 1 the node already covers the whole cell and has
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// getCellVertices() vertices.
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while (size < 1)
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{
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size *= 2;
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vertexLodMod = std::min(0, vertexLodMod + 1);
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}
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vertexLod += std::abs(vertexLodMod);
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}
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return vertexLod;
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}
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/// get the flags to use for stitching in the index buffer so that chunks of different LOD connect seamlessly
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unsigned int getLodFlags(QuadTreeNode* node, unsigned int ourVertexLod, int vertexLodMod, const ViewData* vd)
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{
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unsigned int lodFlags = 0;
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for (unsigned int i = 0; i < 4; ++i)
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{
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QuadTreeNode* neighbour = node->getNeighbour(static_cast<Direction>(i));
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// If the neighbour isn't currently rendering itself,
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// go up until we find one. NOTE: We don't need to go down,
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// because in that case neighbour's detail would be higher than
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// our detail and the neighbour would handle stitching by itself.
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while (neighbour && !vd->contains(neighbour))
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neighbour = neighbour->getParent();
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unsigned int lod = 0;
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if (neighbour)
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lod = getVertexLod(neighbour, vertexLodMod);
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if (lod <= ourVertexLod) // We only need to worry about neighbours less detailed than we are -
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lod = 0; // neighbours with more detail will do the stitching themselves
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// Use 4 bits for each LOD delta
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if (lod > 0)
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{
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lodFlags |= (lod - ourVertexLod) << (4 * i);
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}
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}
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// Use the remaining bits for our vertex LOD
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lodFlags |= (ourVertexLod << (4 * 4));
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return lodFlags;
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}
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void QuadTreeWorld::loadRenderingNode(
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ViewDataEntry& entry, ViewData* vd, float cellWorldSize, const osg::Vec4i& gridbounds, bool compile)
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{
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if (!vd->hasChanged() && entry.mRenderingNode)
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return;
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if (vd->hasChanged())
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{
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vd->buildNodeIndex();
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unsigned int ourVertexLod = getVertexLod(entry.mNode, mVertexLodMod);
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// have to recompute the lodFlags in case a neighbour has changed LOD.
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unsigned int lodFlags = getLodFlags(entry.mNode, ourVertexLod, mVertexLodMod, vd);
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if (lodFlags != entry.mLodFlags)
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{
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entry.mRenderingNode = nullptr;
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entry.mLodFlags = lodFlags;
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}
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}
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if (!entry.mRenderingNode)
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{
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osg::ref_ptr<SceneUtil::PositionAttitudeTransform> pat = new SceneUtil::PositionAttitudeTransform;
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pat->setPosition(osg::Vec3f(
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entry.mNode->getCenter().x() * cellWorldSize, entry.mNode->getCenter().y() * cellWorldSize, 0.f));
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const osg::Vec2f& center = entry.mNode->getCenter();
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bool activeGrid = (center.x() > gridbounds.x() && center.y() > gridbounds.y() && center.x() < gridbounds.z()
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&& center.y() < gridbounds.w());
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for (QuadTreeWorld::ChunkManager* m : mChunkManagers)
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{
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osg::ref_ptr<osg::Node> n = m->getChunk(entry.mNode->getSize(), entry.mNode->getCenter(),
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DefaultLodCallback::getNativeLodLevel(entry.mNode, mMinSize), entry.mLodFlags, activeGrid,
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vd->getViewPoint(), compile);
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if (n)
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pat->addChild(n);
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}
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entry.mRenderingNode = pat;
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}
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}
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void updateWaterCullingView(
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HeightCullCallback* callback, ViewData* vd, osgUtil::CullVisitor* cv, float cellworldsize, bool outofworld)
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{
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if (!(cv->getTraversalMask() & callback->getCullMask()))
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return;
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float lowZ = std::numeric_limits<float>::max();
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float highZ = callback->getHighZ();
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if (cv->getEyePoint().z() <= highZ || outofworld)
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{
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callback->setLowZ(-std::numeric_limits<float>::max());
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return;
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}
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cv->pushCurrentMask();
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static bool debug = getenv("OPENMW_WATER_CULLING_DEBUG") != nullptr;
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for (unsigned int i = 0; i < vd->getNumEntries(); ++i)
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{
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ViewDataEntry& entry = vd->getEntry(i);
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osg::BoundingBox bb
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= static_cast<TerrainDrawable*>(entry.mRenderingNode->asGroup()->getChild(0))->getWaterBoundingBox();
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if (!bb.valid())
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continue;
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osg::Vec3f ofs(
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entry.mNode->getCenter().x() * cellworldsize, entry.mNode->getCenter().y() * cellworldsize, 0.f);
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bb._min += ofs;
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bb._max += ofs;
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bb._min.z() = highZ;
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bb._max.z() = highZ;
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if (cv->isCulled(bb))
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continue;
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lowZ = bb._min.z();
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if (!debug)
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break;
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osg::Box* b = new osg::Box;
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b->set(bb.center(), bb._max - bb.center());
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osg::ShapeDrawable* drw = new osg::ShapeDrawable(b);
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static osg::ref_ptr<osg::StateSet> stateset = nullptr;
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if (!stateset)
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{
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stateset = new osg::StateSet;
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stateset->setMode(GL_CULL_FACE, osg::StateAttribute::OFF);
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stateset->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
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stateset->setAttributeAndModes(
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new osg::PolygonMode(osg::PolygonMode::FRONT_AND_BACK, osg::PolygonMode::LINE),
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osg::StateAttribute::ON);
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osg::Material* m = new osg::Material;
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m->setEmission(osg::Material::FRONT_AND_BACK, osg::Vec4f(0, 0, 1, 1));
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m->setDiffuse(osg::Material::FRONT_AND_BACK, osg::Vec4f(0, 0, 0, 1));
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m->setAmbient(osg::Material::FRONT_AND_BACK, osg::Vec4f(0, 0, 0, 1));
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stateset->setAttributeAndModes(m, osg::StateAttribute::ON);
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stateset->setRenderBinDetails(100, "RenderBin");
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}
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drw->setStateSet(stateset);
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drw->accept(*cv);
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}
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callback->setLowZ(lowZ);
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cv->popCurrentMask();
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}
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void QuadTreeWorld::accept(osg::NodeVisitor& nv)
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{
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bool isCullVisitor = nv.getVisitorType() == osg::NodeVisitor::CULL_VISITOR;
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if (!isCullVisitor && nv.getVisitorType() != osg::NodeVisitor::INTERSECTION_VISITOR)
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return;
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osg::Object* viewer = isCullVisitor ? static_cast<osgUtil::CullVisitor*>(&nv)->getCurrentCamera() : nullptr;
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bool needsUpdate = true;
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osg::Vec3f viewPoint = viewer ? nv.getViewPoint() : nv.getEyePoint();
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ViewData* vd = mViewDataMap->getViewData(viewer, viewPoint, mActiveGrid, needsUpdate);
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if (needsUpdate)
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{
|
|
vd->reset();
|
|
DefaultLodCallback lodCallback(mLodFactor, mMinSize, mViewDistance, mActiveGrid);
|
|
mRootNode->traverseNodes(vd, viewPoint, &lodCallback);
|
|
}
|
|
|
|
const float cellWorldSize = mStorage->getCellWorldSize();
|
|
|
|
for (unsigned int i = 0; i < vd->getNumEntries(); ++i)
|
|
{
|
|
ViewDataEntry& entry = vd->getEntry(i);
|
|
loadRenderingNode(entry, vd, cellWorldSize, mActiveGrid, false);
|
|
entry.mRenderingNode->accept(nv);
|
|
}
|
|
|
|
if (mHeightCullCallback && isCullVisitor)
|
|
updateWaterCullingView(mHeightCullCallback, vd, static_cast<osgUtil::CullVisitor*>(&nv),
|
|
mStorage->getCellWorldSize(), !isGridEmpty());
|
|
|
|
vd->resetChanged();
|
|
|
|
double referenceTime = nv.getFrameStamp() ? nv.getFrameStamp()->getReferenceTime() : 0.0;
|
|
if (referenceTime != 0.0)
|
|
{
|
|
vd->setLastUsageTimeStamp(referenceTime);
|
|
mViewDataMap->clearUnusedViews(referenceTime);
|
|
}
|
|
}
|
|
|
|
void QuadTreeWorld::ensureQuadTreeBuilt()
|
|
{
|
|
std::lock_guard<std::mutex> lock(mQuadTreeMutex);
|
|
if (mQuadTreeBuilt)
|
|
return;
|
|
|
|
QuadTreeBuilder builder(mStorage, mMinSize);
|
|
builder.build();
|
|
|
|
mRootNode = builder.getRootNode();
|
|
mRootNode->setWorld(this);
|
|
mQuadTreeBuilt = true;
|
|
}
|
|
|
|
void QuadTreeWorld::enable(bool enabled)
|
|
{
|
|
if (enabled)
|
|
{
|
|
ensureQuadTreeBuilt();
|
|
|
|
if (!mRootNode->getNumParents())
|
|
mTerrainRoot->addChild(mRootNode);
|
|
}
|
|
else if (mRootNode)
|
|
mTerrainRoot->removeChild(mRootNode);
|
|
}
|
|
|
|
View* QuadTreeWorld::createView()
|
|
{
|
|
return mViewDataMap->createIndependentView();
|
|
}
|
|
|
|
void QuadTreeWorld::preload(View* view, const osg::Vec3f& viewPoint, const osg::Vec4i& grid,
|
|
std::atomic<bool>& abort, Loading::Reporter& reporter)
|
|
{
|
|
ensureQuadTreeBuilt();
|
|
const float cellWorldSize = mStorage->getCellWorldSize();
|
|
|
|
ViewData* vd = static_cast<ViewData*>(view);
|
|
vd->setViewPoint(viewPoint);
|
|
vd->setActiveGrid(grid);
|
|
|
|
for (unsigned int pass = 0; pass < 3; ++pass)
|
|
{
|
|
unsigned int startEntry = vd->getNumEntries();
|
|
|
|
float distanceModifier = 0.f;
|
|
if (pass == 1)
|
|
distanceModifier = 1024;
|
|
else if (pass == 2)
|
|
distanceModifier = -1024;
|
|
DefaultLodCallback lodCallback(mLodFactor, mMinSize, mViewDistance, grid, distanceModifier);
|
|
mRootNode->traverseNodes(vd, viewPoint, &lodCallback);
|
|
|
|
if (pass == 0)
|
|
{
|
|
std::size_t progressTotal = 0;
|
|
for (unsigned int i = 0, n = vd->getNumEntries(); i < n; ++i)
|
|
progressTotal += vd->getEntry(i).mNode->getSize();
|
|
|
|
reporter.addTotal(progressTotal);
|
|
}
|
|
|
|
for (unsigned int i = startEntry; i < vd->getNumEntries() && !abort; ++i)
|
|
{
|
|
ViewDataEntry& entry = vd->getEntry(i);
|
|
|
|
loadRenderingNode(entry, vd, cellWorldSize, grid, true);
|
|
if (pass == 0)
|
|
reporter.addProgress(entry.mNode->getSize());
|
|
vd->removeNodeFromIndex(entry.mNode);
|
|
entry.mNode = nullptr; // Clear node lest we break the neighbours search for the next pass
|
|
}
|
|
}
|
|
}
|
|
|
|
void QuadTreeWorld::reportStats(unsigned int frameNumber, osg::Stats* stats)
|
|
{
|
|
if (mCompositeMapRenderer)
|
|
stats->setAttribute(frameNumber, "Composite", mCompositeMapRenderer->getCompileSetSize());
|
|
}
|
|
|
|
void QuadTreeWorld::loadCell(int x, int y)
|
|
{
|
|
// fallback behavior only for undefined cells (every other is already handled in quadtree)
|
|
float dummy;
|
|
if (mChunkManager && !mStorage->getMinMaxHeights(1, osg::Vec2f(x + 0.5, y + 0.5), dummy, dummy))
|
|
TerrainGrid::loadCell(x, y);
|
|
else
|
|
World::loadCell(x, y);
|
|
}
|
|
|
|
void QuadTreeWorld::unloadCell(int x, int y)
|
|
{
|
|
// fallback behavior only for undefined cells (every other is already handled in quadtree)
|
|
float dummy;
|
|
if (mChunkManager && !mStorage->getMinMaxHeights(1, osg::Vec2f(x + 0.5, y + 0.5), dummy, dummy))
|
|
TerrainGrid::unloadCell(x, y);
|
|
else
|
|
World::unloadCell(x, y);
|
|
}
|
|
|
|
void QuadTreeWorld::addChunkManager(QuadTreeWorld::ChunkManager* m)
|
|
{
|
|
mChunkManagers.push_back(m);
|
|
mTerrainRoot->setNodeMask(mTerrainRoot->getNodeMask() | m->getNodeMask());
|
|
if (m->getViewDistance())
|
|
m->setMaxLodLevel(DefaultLodCallback::convertDistanceToLodLevel(
|
|
m->getViewDistance() + mViewDataMap->getReuseDistance(), mMinSize, mLodFactor));
|
|
}
|
|
|
|
void QuadTreeWorld::rebuildViews()
|
|
{
|
|
mViewDataMap->rebuildViews();
|
|
}
|
|
|
|
void QuadTreeWorld::setViewDistance(float viewDistance)
|
|
{
|
|
if (mViewDistance == viewDistance)
|
|
return;
|
|
mViewDistance = viewDistance;
|
|
mViewDataMap->rebuildViews();
|
|
}
|
|
|
|
}
|