mirror of https://github.com/AxioDL/metaforce.git
395 lines
12 KiB
C++
395 lines
12 KiB
C++
#include "AROTBuilder.hpp"
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#include "hecl/Blender/Connection.hpp"
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namespace DataSpec
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{
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logvisor::Module Log("AROTBuilder");
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#define AROT_MAX_LEVEL 6
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#define COLLISION_MIN_NODE_TRIANGLES 16
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static zeus::CAABox SplitAABB(const zeus::CAABox& aabb, int i)
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{
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zeus::CAABox pos, neg;
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aabb.splitZ(neg, pos);
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if (i & 4)
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{
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zeus::CAABox(pos).splitY(neg, pos);
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if (i & 2)
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{
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zeus::CAABox(pos).splitX(neg, pos);
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if (i & 1)
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return pos;
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else
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return neg;
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}
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else
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{
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zeus::CAABox(neg).splitX(neg, pos);
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if (i & 1)
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return pos;
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else
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return neg;
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}
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}
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else
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{
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zeus::CAABox(neg).splitY(neg, pos);
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if (i & 2)
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{
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zeus::CAABox(pos).splitX(neg, pos);
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if (i & 1)
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return pos;
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else
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return neg;
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}
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else
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{
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zeus::CAABox(neg).splitX(neg, pos);
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if (i & 1)
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return pos;
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else
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return neg;
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}
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}
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}
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void AROTBuilder::Node::addChild(int level, int minChildren, const std::vector<zeus::CAABox>& triBoxes,
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const zeus::CAABox& curAABB, BspNodeType& typeOut)
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{
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/* Gather intersecting faces */
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for (int i=0 ; i<triBoxes.size() ; ++i)
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if (triBoxes[i].intersects(curAABB))
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childIndices.insert(i);
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/* Return early if empty, triangle intersection below performance threshold, or at max level */
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if (childIndices.empty())
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{
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typeOut = BspNodeType::Invalid;
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return;
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}
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else if (childIndices.size() < minChildren || level == AROT_MAX_LEVEL)
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{
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typeOut = BspNodeType::Leaf;
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return;
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}
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/* Subdivide */
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typeOut = BspNodeType::Branch;
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childNodes.resize(8);
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for (int i=0 ; i<8 ; ++i)
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{
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BspNodeType chType;
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childNodes[i].addChild(level + 1, minChildren, triBoxes, SplitAABB(curAABB, i), chType);
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flags |= int(chType) << (i * 2);
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}
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/* Unsubdivide */
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compSubdivs = 0;
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if (childNodes[0].childIndices != childNodes[1].childIndices ||
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childNodes[4].childIndices != childNodes[5].childIndices ||
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childNodes[2].childIndices != childNodes[3].childIndices ||
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childNodes[6].childIndices != childNodes[7].childIndices)
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compSubdivs |= 0x4;
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if (childNodes[0].childIndices != childNodes[2].childIndices ||
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childNodes[1].childIndices != childNodes[3].childIndices ||
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childNodes[4].childIndices != childNodes[6].childIndices ||
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childNodes[5].childIndices != childNodes[7].childIndices)
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compSubdivs |= 0x2;
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if (childNodes[0].childIndices != childNodes[4].childIndices ||
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childNodes[1].childIndices != childNodes[5].childIndices ||
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childNodes[2].childIndices != childNodes[6].childIndices ||
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childNodes[3].childIndices != childNodes[7].childIndices)
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compSubdivs |= 0x1;
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if (!compSubdivs)
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{
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typeOut = BspNodeType::Leaf;
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childNodes = std::vector<Node>();
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flags = 0;
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}
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}
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size_t AROTBuilder::BitmapPool::addIndices(const std::set<int>& indices)
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{
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for (size_t i=0 ; i<m_pool.size() ; ++i)
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if (m_pool[i] == indices)
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return i;
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m_pool.push_back(indices);
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return m_pool.size() - 1;
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}
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static const uint32_t AROTChildCounts[] = { 0, 2, 2, 4, 2, 4, 4, 8 };
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void AROTBuilder::Node::nodeCount(size_t& sz, size_t& idxRefs, BitmapPool& bmpPool, size_t& curOff)
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{
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sz += 1;
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poolIdx = bmpPool.addIndices(childIndices);
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if (poolIdx > 65535)
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Log.report(logvisor::Fatal, "AROT bitmap exceeds 16-bit node addressing; area too complex");
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uint32_t childCount = AROTChildCounts[compSubdivs];
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nodeOff = curOff;
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nodeSz = childCount * 2 + 4;
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curOff += nodeSz;
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if (childNodes.size())
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{
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for (int k=0 ; k < 1 + ((compSubdivs & 0x1) != 0) ; ++k)
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{
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for (int j=0 ; j < 1 + ((compSubdivs & 0x2) != 0) ; ++j)
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{
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for (int i=0 ; i < 1 + ((compSubdivs & 0x4) != 0) ; ++i)
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{
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int idx = k*4 + j*2 + i;
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childNodes[idx].nodeCount(sz, idxRefs, bmpPool, curOff);
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}
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}
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}
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idxRefs += childCount;
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}
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}
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void AROTBuilder::Node::writeIndirectionTable(athena::io::MemoryWriter& w)
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{
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w.writeUint32Big(nodeOff);
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if (childNodes.size())
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{
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for (int k=0 ; k < 1 + ((compSubdivs & 0x1) != 0) ; ++k)
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{
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for (int j=0 ; j < 1 + ((compSubdivs & 0x2) != 0) ; ++j)
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{
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for (int i=0 ; i < 1 + ((compSubdivs & 0x4) != 0) ; ++i)
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{
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int idx = k*4 + j*2 + i;
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childNodes[idx].writeIndirectionTable(w);
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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 AROTBuilder::Node::writeNodes(athena::io::MemoryWriter& w, int nodeIdx)
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{
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w.writeUint16Big(poolIdx);
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w.writeUint16Big(compSubdivs);
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if (childNodes.size())
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{
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int curIdx = nodeIdx + 1;
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if (curIdx > 65535)
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Log.report(logvisor::Fatal, "AROT node exceeds 16-bit node addressing; area too complex");
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int childIndices[8];
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for (int k=0 ; k < 1 + ((compSubdivs & 0x1) != 0) ; ++k)
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{
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for (int j=0 ; j < 1 + ((compSubdivs & 0x2) != 0) ; ++j)
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{
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for (int i=0 ; i < 1 + ((compSubdivs & 0x4) != 0) ; ++i)
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{
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int idx = k*4 + j*2 + i;
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w.writeUint16Big(curIdx);
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childIndices[idx] = curIdx;
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childNodes[idx].advanceIndex(curIdx);
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}
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}
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}
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for (int k=0 ; k < 1 + ((compSubdivs & 0x1) != 0) ; ++k)
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{
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for (int j=0 ; j < 1 + ((compSubdivs & 0x2) != 0) ; ++j)
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{
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for (int i=0 ; i < 1 + ((compSubdivs & 0x4) != 0) ; ++i)
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{
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int idx = k*4 + j*2 + i;
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childNodes[idx].writeNodes(w, childIndices[idx]);
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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 AROTBuilder::Node::advanceIndex(int& nodeIdx)
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{
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++nodeIdx;
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if (childNodes.size())
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{
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for (int k=0 ; k < 1 + ((compSubdivs & 0x1) != 0) ; ++k)
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{
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for (int j=0 ; j < 1 + ((compSubdivs & 0x2) != 0) ; ++j)
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{
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for (int i=0 ; i < 1 + ((compSubdivs & 0x4) != 0) ; ++i)
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{
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int idx = k*4 + j*2 + i;
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childNodes[idx].advanceIndex(nodeIdx);
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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 AROTBuilder::Node::colSize(size_t& totalSz)
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{
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if (childIndices.size())
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{
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nodeOff = totalSz;
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if (childNodes.empty())
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{
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totalSz += 26 + childIndices.size() * 2;
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}
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else
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{
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totalSz += 36;
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for (int i=0 ; i<8 ; ++i)
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childNodes[i].colSize(totalSz);
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}
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}
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}
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void AROTBuilder::Node::writeColNodes(uint8_t*& ptr, const zeus::CAABox& curAABB)
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{
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if (childIndices.size())
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{
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if (childNodes.empty())
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{
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float* aabbOut = reinterpret_cast<float*>(ptr);
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aabbOut[0] = hecl::SBig(curAABB.min[0]);
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aabbOut[1] = hecl::SBig(curAABB.min[1]);
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aabbOut[2] = hecl::SBig(curAABB.min[2]);
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aabbOut[3] = hecl::SBig(curAABB.max[0]);
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aabbOut[4] = hecl::SBig(curAABB.max[1]);
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aabbOut[5] = hecl::SBig(curAABB.max[2]);
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athena::io::MemoryWriter w(ptr + 24, INT32_MAX);
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w.writeUint16Big(childIndices.size());
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for (int idx : childIndices)
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w.writeUint16Big(idx);
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ptr += 26 + childIndices.size() * 2;
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}
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else
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{
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uint16_t* pflags = reinterpret_cast<uint16_t*>(ptr);
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uint32_t* offsets = reinterpret_cast<uint32_t*>(ptr + 4);
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memset(pflags, 0, sizeof(uint32_t) * 9);
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for (int i=0 ; i<8 ; ++i)
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{
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const Node& chNode = childNodes[i];
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BspNodeType type = BspNodeType((flags >> (i * 2)) & 0x3);
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if (type != BspNodeType::Invalid)
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offsets[i] = hecl::SBig(uint32_t(chNode.nodeOff - nodeOff - 36));
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}
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*pflags = hecl::SBig(flags);
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ptr += 36;
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for (int i=0 ; i<8 ; ++i)
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childNodes[i].writeColNodes(ptr, SplitAABB(curAABB, i));
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}
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}
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}
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void AROTBuilder::build(std::vector<std::vector<uint8_t>>& secs, const zeus::CAABox& fullAabb,
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const std::vector<zeus::CAABox>& meshAabbs, const std::vector<DNACMDL::Mesh>& meshes)
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{
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/* Recursively split */
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BspNodeType rootType;
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rootNode.addChild(0, 1, meshAabbs, fullAabb, rootType);
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/* Calculate indexing metrics */
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size_t totalNodeCount = 0;
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size_t idxRefCount = 0;
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size_t curOff = 0;
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rootNode.nodeCount(totalNodeCount, idxRefCount, bmpPool, curOff);
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size_t bmpWordCount = ROUND_UP_32(meshes.size()) / 32;
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size_t arotSz = 64 + bmpWordCount * bmpPool.m_pool.size() * 4 + totalNodeCount * 8 + idxRefCount * 2;
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/* Write header */
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secs.emplace_back(arotSz, 0);
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athena::io::MemoryWriter w(secs.back().data(), secs.back().size());
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w.writeUint32Big('AROT');
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w.writeUint32Big(1);
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w.writeUint32Big(bmpPool.m_pool.size());
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w.writeUint32Big(meshes.size());
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w.writeUint32Big(totalNodeCount);
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w.writeVec3fBig(fullAabb.min);
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w.writeVec3fBig(fullAabb.max);
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w.seekAlign32();
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/* Write bitmap */
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std::vector<uint32_t> bmpWords;
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bmpWords.reserve(bmpWordCount);
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for (const std::set<int>& bmp : bmpPool.m_pool)
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{
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bmpWords.clear();
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bmpWords.resize(bmpWordCount);
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auto bmpIt = bmp.cbegin();
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if (bmpIt != bmp.cend())
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{
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int curIdx = 0;
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for (int w=0 ; w<bmpWordCount ; ++w)
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{
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for (int b=0 ; b<32 ; ++b)
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{
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if (*bmpIt == curIdx)
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{
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bmpWords[w] |= 1 << b;
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++bmpIt;
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if (bmpIt == bmp.cend())
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break;
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}
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++curIdx;
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}
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if (bmpIt == bmp.cend())
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break;
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}
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}
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for (uint32_t word : bmpWords)
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w.writeUint32Big(word);
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}
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/* Write the rest */
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rootNode.writeIndirectionTable(w);
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rootNode.writeNodes(w, 0);
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}
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std::pair<std::unique_ptr<uint8_t[]>, uint32_t> AROTBuilder::buildCol(const ColMesh& mesh, BspNodeType& rootOut)
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{
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/* Accumulate total AABB */
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zeus::CAABox fullAABB;
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for (const auto& vert : mesh.verts)
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fullAABB.accumulateBounds(zeus::CVector3f(vert));
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/* Predetermine triangle AABBs */
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std::vector<zeus::CAABox> triBoxes;
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triBoxes.reserve(mesh.trianges.size());
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for (const ColMesh::Triangle& tri : mesh.trianges)
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{
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triBoxes.emplace_back();
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zeus::CAABox& aabb = triBoxes.back();
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for (int e=0 ; e<3 ; ++e)
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{
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const ColMesh::Edge& edge = mesh.edges[tri.edges[e]];
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for (int v=0 ; v<2 ; ++v)
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{
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const auto& vert = mesh.verts[edge.verts[v]];
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aabb.accumulateBounds(zeus::CVector3f(vert));
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}
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}
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}
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/* Recursively split */
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rootNode.addChild(0, COLLISION_MIN_NODE_TRIANGLES, triBoxes, fullAABB, rootOut);
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/* Calculate offsets and write out */
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size_t totalSize = 0;
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rootNode.colSize(totalSize);
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std::unique_ptr<uint8_t[]> ret(new uint8_t[totalSize]);
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uint8_t* ptr = ret.get();
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rootNode.writeColNodes(ptr, fullAABB);
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return {std::move(ret), totalSize};
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}
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}
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