mirror of https://github.com/minetest/irrlicht.git
390 lines
9.5 KiB
C++
390 lines
9.5 KiB
C++
// Copyright (C) 2002-2012 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#ifndef __C_OCTREE_H_INCLUDED__
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#define __C_OCTREE_H_INCLUDED__
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#include "SViewFrustum.h"
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#include "S3DVertex.h"
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#include "aabbox3d.h"
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#include "irrArray.h"
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#include "CMeshBuffer.h"
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/**
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Flags for Octree
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*/
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//! bypass full invisible/visible test
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#define OCTREE_PARENTTEST
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namespace irr
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{
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//! template octree.
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/** T must be a vertex type which has a member
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called .Pos, which is a core::vertex3df position. */
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template <class T>
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class Octree
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{
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public:
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// TODO: Using reference counted class on the stack.
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// Reason is likely that it really costs speed here otherwise.
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// But doing so prevents using VBO's with octrees.
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// Also it's just a bad idea, for example this is the reason
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// we can't make the copy-constructor private for IReferenceCounted.
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// So would be nice to figure out how to put this on heap (and check
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// if it's maybe cheap enough) or maybe stop using CMeshBuffer here.
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struct SMeshChunk : public scene::CMeshBuffer<T>
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{
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SMeshChunk ()
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: scene::CMeshBuffer<T>(), MaterialId(0)
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{
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scene::CMeshBuffer<T>::grab();
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}
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virtual ~SMeshChunk ()
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{
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//removeAllHardwareBuffers
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}
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s32 MaterialId;
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};
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struct SIndexChunk
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{
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core::array<u16> Indices;
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s32 MaterialId;
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};
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struct SIndexData
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{
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u16* Indices;
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s32 CurrentSize;
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s32 MaxSize;
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};
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//! Constructor
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Octree(const core::array<SMeshChunk>& meshes, s32 minimalPolysPerNode=128) :
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IndexData(0), IndexDataCount(meshes.size()), NodeCount(0)
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{
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IndexData = new SIndexData[IndexDataCount];
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// construct array of all indices
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core::array<SIndexChunk>* indexChunks = new core::array<SIndexChunk>;
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indexChunks->reallocate(meshes.size());
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for (u32 i=0; i!=meshes.size(); ++i)
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{
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IndexData[i].CurrentSize = 0;
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IndexData[i].MaxSize = meshes[i].Indices.size();
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IndexData[i].Indices = new u16[IndexData[i].MaxSize];
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indexChunks->push_back(SIndexChunk());
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SIndexChunk& tic = indexChunks->getLast();
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tic.MaterialId = meshes[i].MaterialId;
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tic.Indices = meshes[i].Indices;
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}
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// create tree
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Root = new OctreeNode(NodeCount, 0, meshes, indexChunks, minimalPolysPerNode);
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}
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//! returns all ids of polygons partially or fully enclosed
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//! by this bounding box.
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void calculatePolys(const core::aabbox3d<f32>& box)
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{
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for (u32 i=0; i!=IndexDataCount; ++i)
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IndexData[i].CurrentSize = 0;
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Root->getPolys(box, IndexData, 0);
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}
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//! returns all ids of polygons partially or fully enclosed
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//! by a view frustum.
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void calculatePolys(const scene::SViewFrustum& frustum)
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{
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for (u32 i=0; i!=IndexDataCount; ++i)
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IndexData[i].CurrentSize = 0;
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Root->getPolys(frustum, IndexData, 0);
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}
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const SIndexData* getIndexData() const
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{
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return IndexData;
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}
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u32 getIndexDataCount() const
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{
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return IndexDataCount;
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}
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u32 getNodeCount() const
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{
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return NodeCount;
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}
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//! for debug purposes only, collects the bounding boxes of the tree
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void getBoundingBoxes(const core::aabbox3d<f32>& box,
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core::array< const core::aabbox3d<f32>* >&outBoxes) const
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{
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Root->getBoundingBoxes(box, outBoxes);
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}
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//! destructor
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~Octree()
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{
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for (u32 i=0; i<IndexDataCount; ++i)
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delete [] IndexData[i].Indices;
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delete [] IndexData;
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delete Root;
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}
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private:
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// private inner class
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class OctreeNode
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{
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public:
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// constructor
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OctreeNode(u32& nodeCount, u32 currentdepth,
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const core::array<SMeshChunk>& allmeshdata,
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core::array<SIndexChunk>* indices,
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s32 minimalPolysPerNode) : IndexData(0),
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Depth(currentdepth+1)
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{
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++nodeCount;
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u32 i; // new ISO for scoping problem with different compilers
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for (i=0; i!=8; ++i)
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Children[i] = 0;
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if (indices->empty())
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{
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delete indices;
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return;
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}
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bool found = false;
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// find first point for bounding box
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for (i=0; i<indices->size(); ++i)
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{
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if (!(*indices)[i].Indices.empty())
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{
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Box.reset(allmeshdata[i].Vertices[(*indices)[i].Indices[0]].Pos);
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found = true;
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break;
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}
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}
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if (!found)
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{
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delete indices;
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return;
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}
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s32 totalPrimitives = 0;
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// now lets calculate our bounding box
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for (i=0; i<indices->size(); ++i)
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{
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totalPrimitives += (*indices)[i].Indices.size();
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for (u32 j=0; j<(*indices)[i].Indices.size(); ++j)
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Box.addInternalPoint(allmeshdata[i].Vertices[(*indices)[i].Indices[j]].Pos);
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}
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core::vector3df middle = Box.getCenter();
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core::vector3df edges[8];
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Box.getEdges(edges);
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// calculate all children
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core::aabbox3d<f32> box;
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core::array<u16> keepIndices;
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if (totalPrimitives > minimalPolysPerNode && !Box.isEmpty())
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for (u32 ch=0; ch!=8; ++ch)
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{
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box.reset(middle);
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box.addInternalPoint(edges[ch]);
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// create indices for child
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bool added = false;
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core::array<SIndexChunk>* cindexChunks = new core::array<SIndexChunk>;
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cindexChunks->reallocate(allmeshdata.size());
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for (i=0; i<allmeshdata.size(); ++i)
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{
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cindexChunks->push_back(SIndexChunk());
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SIndexChunk& tic = cindexChunks->getLast();
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tic.MaterialId = allmeshdata[i].MaterialId;
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for (u32 t=0; t<(*indices)[i].Indices.size(); t+=3)
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{
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if (box.isPointInside(allmeshdata[i].Vertices[(*indices)[i].Indices[t]].Pos) &&
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box.isPointInside(allmeshdata[i].Vertices[(*indices)[i].Indices[t+1]].Pos) &&
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box.isPointInside(allmeshdata[i].Vertices[(*indices)[i].Indices[t+2]].Pos))
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{
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tic.Indices.push_back((*indices)[i].Indices[t]);
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tic.Indices.push_back((*indices)[i].Indices[t+1]);
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tic.Indices.push_back((*indices)[i].Indices[t+2]);
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added = true;
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}
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else
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{
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keepIndices.push_back((*indices)[i].Indices[t]);
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keepIndices.push_back((*indices)[i].Indices[t+1]);
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keepIndices.push_back((*indices)[i].Indices[t+2]);
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}
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}
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(*indices)[i].Indices.set_used(keepIndices.size());
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memcpy( (*indices)[i].Indices.pointer(), keepIndices.pointer(), keepIndices.size()*sizeof(u16));
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keepIndices.set_used(0);
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}
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if (added)
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Children[ch] = new OctreeNode(nodeCount, Depth,
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allmeshdata, cindexChunks, minimalPolysPerNode);
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else
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delete cindexChunks;
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} // end for all possible children
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IndexData = indices;
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}
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// destructor
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~OctreeNode()
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{
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delete IndexData;
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for (u32 i=0; i<8; ++i)
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delete Children[i];
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}
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// returns all ids of polygons partially or full enclosed
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// by this bounding box.
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void getPolys(const core::aabbox3d<f32>& box, SIndexData* idxdata, u32 parentTest ) const
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{
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#if defined (OCTREE_PARENTTEST )
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// if not full inside
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if ( parentTest != 2 )
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{
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// partially inside ?
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if (!Box.intersectsWithBox(box))
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return;
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// fully inside ?
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parentTest = Box.isFullInside(box)?2:1;
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}
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#else
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if (Box.intersectsWithBox(box))
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#endif
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{
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const u32 cnt = IndexData->size();
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u32 i; // new ISO for scoping problem in some compilers
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for (i=0; i<cnt; ++i)
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{
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const s32 idxcnt = (*IndexData)[i].Indices.size();
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if (idxcnt)
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{
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memcpy(&idxdata[i].Indices[idxdata[i].CurrentSize],
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&(*IndexData)[i].Indices[0], idxcnt * sizeof(s16));
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idxdata[i].CurrentSize += idxcnt;
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}
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}
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for (i=0; i!=8; ++i)
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if (Children[i])
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Children[i]->getPolys(box, idxdata,parentTest);
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}
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}
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// returns all ids of polygons partially or full enclosed
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// by the view frustum.
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void getPolys(const scene::SViewFrustum& frustum, SIndexData* idxdata,u32 parentTest) const
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{
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u32 i; // new ISO for scoping problem in some compilers
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// if parent is fully inside, no further check for the children is needed
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#if defined (OCTREE_PARENTTEST )
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if ( parentTest != 2 )
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#endif
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{
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#if defined (OCTREE_PARENTTEST )
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parentTest = 2;
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#endif
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for (i=0; i!=scene::SViewFrustum::VF_PLANE_COUNT; ++i)
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{
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core::EIntersectionRelation3D r = Box.classifyPlaneRelation(frustum.planes[i]);
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if ( r == core::ISREL3D_FRONT )
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return;
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#if defined (OCTREE_PARENTTEST )
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if ( r == core::ISREL3D_CLIPPED )
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parentTest = 1; // must still check children
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#endif
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}
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}
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const u32 cnt = IndexData->size();
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for (i=0; i!=cnt; ++i)
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{
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s32 idxcnt = (*IndexData)[i].Indices.size();
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if (idxcnt)
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{
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memcpy(&idxdata[i].Indices[idxdata[i].CurrentSize],
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&(*IndexData)[i].Indices[0], idxcnt * sizeof(s16));
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idxdata[i].CurrentSize += idxcnt;
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}
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}
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for (i=0; i!=8; ++i)
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if (Children[i])
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Children[i]->getPolys(frustum, idxdata,parentTest);
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}
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//! for debug purposes only, collects the bounding boxes of the node
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void getBoundingBoxes(const core::aabbox3d<f32>& box,
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core::array< const core::aabbox3d<f32>* >&outBoxes) const
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{
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if (Box.intersectsWithBox(box))
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{
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outBoxes.push_back(&Box);
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for (u32 i=0; i!=8; ++i)
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if (Children[i])
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Children[i]->getBoundingBoxes(box, outBoxes);
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}
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}
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private:
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core::aabbox3df Box;
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core::array<SIndexChunk>* IndexData;
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OctreeNode* Children[8];
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u32 Depth;
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};
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OctreeNode* Root;
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SIndexData* IndexData;
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u32 IndexDataCount;
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u32 NodeCount;
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};
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} // end namespace
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#endif
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