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metaforce/DataSpec/DNACommon/AROTBuilder.cpp

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#include "AROTBuilder.hpp"
#include <algorithm>
#include <array>
#include "hecl/Blender/Connection.hpp"
#include "../DNAMP1/PATH.hpp"
namespace DataSpec {
logvisor::Module Log("AROTBuilder");
constexpr s32 AROT_MAX_LEVEL = 10;
constexpr s32 AROT_MIN_MODELS = 8;
constexpr s32 COLLISION_MIN_NODE_TRIANGLES = 8;
constexpr s32 PATH_MIN_NODE_REGIONS = 16;
constexpr float AROT_MIN_SUBDIV = 10.f;
static zeus::CAABox SplitAABB(const zeus::CAABox& aabb, int i) {
zeus::CAABox pos, neg;
aabb.splitZ(neg, pos);
if (i & 4) {
zeus::CAABox(pos).splitY(neg, pos);
if (i & 2) {
zeus::CAABox(pos).splitX(neg, pos);
if (i & 1)
return pos;
else
return neg;
} else {
zeus::CAABox(neg).splitX(neg, pos);
if (i & 1)
return pos;
else
return neg;
}
} else {
zeus::CAABox(neg).splitY(neg, pos);
if (i & 2) {
zeus::CAABox(pos).splitX(neg, pos);
if (i & 1)
return pos;
else
return neg;
} else {
zeus::CAABox(neg).splitX(neg, pos);
if (i & 1)
return pos;
else
return neg;
}
}
}
void AROTBuilder::Node::mergeSets(int a, int b) {
childNodes[a].childIndices.insert(childNodes[b].childIndices.cbegin(), childNodes[b].childIndices.cend());
childNodes[b].childIndices = childNodes[a].childIndices;
}
bool AROTBuilder::Node::compareSets(int a, int b) const {
return childNodes[a].childIndices != childNodes[b].childIndices;
}
void AROTBuilder::Node::addChild(int level, int minChildren, const std::vector<zeus::CAABox>& triBoxes,
const zeus::CAABox& curAABB, BspNodeType& typeOut) {
/* Gather intersecting faces */
for (size_t i = 0; i < triBoxes.size(); ++i)
if (triBoxes[i].intersects(curAABB))
childIndices.insert(i);
zeus::CVector3f extents = curAABB.extents();
/* Return early if empty, triangle intersection below performance threshold, or at max level */
if (childIndices.empty()) {
typeOut = BspNodeType::Invalid;
return;
} else if (childIndices.size() < minChildren || level == AROT_MAX_LEVEL ||
std::max(extents.x(), std::max(extents.y(), extents.z())) < AROT_MIN_SUBDIV) {
typeOut = BspNodeType::Leaf;
return;
}
/* Subdivide */
typeOut = BspNodeType::Branch;
childNodes.resize(8);
for (int i = 0; i < 8; ++i) {
BspNodeType chType;
childNodes[i].addChild(level + 1, minChildren, triBoxes, SplitAABB(curAABB, i), chType);
flags |= int(chType) << (i * 2);
}
/* Unsubdivide minimum axis dimensions */
if (extents.x() < AROT_MIN_SUBDIV) {
mergeSets(0, 1);
mergeSets(4, 5);
mergeSets(2, 3);
mergeSets(6, 7);
}
if (extents.y() < AROT_MIN_SUBDIV) {
mergeSets(0, 2);
mergeSets(1, 3);
mergeSets(4, 6);
mergeSets(5, 7);
}
if (extents.z() < AROT_MIN_SUBDIV) {
mergeSets(0, 4);
mergeSets(1, 5);
mergeSets(2, 6);
mergeSets(3, 7);
}
/* Unsubdivide */
compSubdivs = 0;
if (compareSets(0, 1) || compareSets(4, 5) || compareSets(2, 3) || compareSets(6, 7))
compSubdivs |= 0x1;
if (compareSets(0, 2) || compareSets(1, 3) || compareSets(4, 6) || compareSets(5, 7))
compSubdivs |= 0x2;
if (compareSets(0, 4) || compareSets(1, 5) || compareSets(2, 6) || compareSets(3, 7))
compSubdivs |= 0x4;
if (!compSubdivs) {
typeOut = BspNodeType::Leaf;
childNodes = std::vector<Node>();
flags = 0;
}
}
size_t AROTBuilder::BitmapPool::addIndices(const std::set<int>& indices) {
for (size_t i = 0; i < m_pool.size(); ++i)
if (m_pool[i] == indices)
return i;
m_pool.push_back(indices);
return m_pool.size() - 1;
}
constexpr std::array<uint32_t, 8> AROTChildCounts{
0, 2, 2, 4, 2, 4, 4, 8,
};
void AROTBuilder::Node::nodeCount(size_t& sz, size_t& idxRefs, BitmapPool& bmpPool, size_t& curOff) {
sz += 1;
poolIdx = bmpPool.addIndices(childIndices);
if (poolIdx > 65535)
Log.report(logvisor::Fatal, fmt("AROT bitmap exceeds 16-bit node addressing; area too complex"));
uint32_t childCount = AROTChildCounts[compSubdivs];
nodeOff = curOff;
nodeSz = childCount * 2 + 4;
curOff += nodeSz;
if (childNodes.size()) {
for (int k = 0; k < 1 + ((compSubdivs & 0x4) != 0); ++k) {
for (int j = 0; j < 1 + ((compSubdivs & 0x2) != 0); ++j) {
for (int i = 0; i < 1 + ((compSubdivs & 0x1) != 0); ++i) {
int idx = k * 4 + j * 2 + i;
childNodes[idx].nodeCount(sz, idxRefs, bmpPool, curOff);
}
}
}
idxRefs += childCount;
}
}
void AROTBuilder::Node::writeIndirectionTable(athena::io::MemoryWriter& w) {
w.writeUint32Big(nodeOff);
if (childNodes.size()) {
for (int k = 0; k < 1 + ((compSubdivs & 0x4) != 0); ++k) {
for (int j = 0; j < 1 + ((compSubdivs & 0x2) != 0); ++j) {
for (int i = 0; i < 1 + ((compSubdivs & 0x1) != 0); ++i) {
int idx = k * 4 + j * 2 + i;
childNodes[idx].writeIndirectionTable(w);
}
}
}
}
}
void AROTBuilder::Node::writeNodes(athena::io::MemoryWriter& w, int nodeIdx) {
w.writeUint16Big(poolIdx);
w.writeUint16Big(compSubdivs);
if (childNodes.size()) {
int curIdx = nodeIdx + 1;
if (curIdx > 65535)
Log.report(logvisor::Fatal, fmt("AROT node exceeds 16-bit node addressing; area too complex"));
std::array<int, 8> childIndices;
for (int k = 0; k < 1 + ((compSubdivs & 0x4) != 0); ++k) {
for (int j = 0; j < 1 + ((compSubdivs & 0x2) != 0); ++j) {
for (int i = 0; i < 1 + ((compSubdivs & 0x1) != 0); ++i) {
int idx = k * 4 + j * 2 + i;
w.writeUint16Big(curIdx);
childIndices[idx] = curIdx;
childNodes[idx].advanceIndex(curIdx);
}
}
}
for (int k = 0; k < 1 + ((compSubdivs & 0x4) != 0); ++k) {
for (int j = 0; j < 1 + ((compSubdivs & 0x2) != 0); ++j) {
for (int i = 0; i < 1 + ((compSubdivs & 0x1) != 0); ++i) {
int idx = k * 4 + j * 2 + i;
childNodes[idx].writeNodes(w, childIndices[idx]);
}
}
}
}
}
void AROTBuilder::Node::advanceIndex(int& nodeIdx) {
++nodeIdx;
if (childNodes.size()) {
for (int k = 0; k < 1 + ((compSubdivs & 0x4) != 0); ++k) {
for (int j = 0; j < 1 + ((compSubdivs & 0x2) != 0); ++j) {
for (int i = 0; i < 1 + ((compSubdivs & 0x1) != 0); ++i) {
int idx = k * 4 + j * 2 + i;
childNodes[idx].advanceIndex(nodeIdx);
}
}
}
}
}
void AROTBuilder::Node::colSize(size_t& totalSz) {
if (childIndices.size()) {
nodeOff = totalSz;
if (childNodes.empty()) {
totalSz += 26 + childIndices.size() * 2;
} else {
totalSz += 36;
for (int i = 0; i < 8; ++i)
childNodes[i].colSize(totalSz);
}
}
}
void AROTBuilder::Node::writeColNodes(uint8_t*& ptr, const zeus::CAABox& curAABB) {
if (childIndices.size()) {
if (childNodes.empty()) {
float* aabbOut = reinterpret_cast<float*>(ptr);
aabbOut[0] = hecl::SBig(curAABB.min[0]);
aabbOut[1] = hecl::SBig(curAABB.min[1]);
aabbOut[2] = hecl::SBig(curAABB.min[2]);
aabbOut[3] = hecl::SBig(curAABB.max[0]);
aabbOut[4] = hecl::SBig(curAABB.max[1]);
aabbOut[5] = hecl::SBig(curAABB.max[2]);
athena::io::MemoryWriter w(ptr + 24, INT32_MAX);
w.writeUint16Big(childIndices.size());
for (int idx : childIndices)
w.writeUint16Big(idx);
ptr += 26 + childIndices.size() * 2;
} else {
uint16_t* pflags = reinterpret_cast<uint16_t*>(ptr);
uint32_t* offsets = reinterpret_cast<uint32_t*>(ptr + 4);
memset(pflags, 0, sizeof(uint32_t) * 9);
for (int i = 0; i < 8; ++i) {
const Node& chNode = childNodes[i];
BspNodeType type = BspNodeType((flags >> (i * 2)) & 0x3);
if (type != BspNodeType::Invalid)
offsets[i] = hecl::SBig(uint32_t(chNode.nodeOff - nodeOff - 36));
}
*pflags = hecl::SBig(flags);
ptr += 36;
for (int i = 0; i < 8; ++i)
childNodes[i].writeColNodes(ptr, SplitAABB(curAABB, i));
}
}
}
void AROTBuilder::Node::pathCountNodesAndLookups(size_t& nodeCount, size_t& lookupCount) {
++nodeCount;
if (childNodes.empty()) {
lookupCount += childIndices.size();
} else {
for (int i = 0; i < 8; ++i)
childNodes[i].pathCountNodesAndLookups(nodeCount, lookupCount);
}
}
void AROTBuilder::Node::pathWrite(DNAMP1::PATH& path, const zeus::CAABox& curAABB) {
if (childNodes.empty()) {
path.octree.emplace_back();
DNAMP1::PATH::OctreeNode& n = path.octree.back();
n.isLeaf = 1;
n.aabb[0] = curAABB.min;
n.aabb[1] = curAABB.max;
n.centroid = curAABB.center();
std::fill(std::begin(n.children), std::end(n.children), 0xFFFFFFFF);
n.regionCount = childIndices.size();
n.regionStart = path.octreeRegionLookup.size();
for (int r : childIndices)
path.octreeRegionLookup.push_back(r);
} else {
std::array<atUint32, 8> children;
for (size_t i = 0; i < children.size(); ++i) {
/* Head recursion (first node will be a leaf) */
childNodes[i].pathWrite(path, SplitAABB(curAABB, static_cast<int>(i)));
children[i] = path.octree.size() - 1;
}
path.octree.emplace_back();
DNAMP1::PATH::OctreeNode& n = path.octree.back();
n.isLeaf = 0;
n.aabb[0] = curAABB.min;
n.aabb[1] = curAABB.max;
n.centroid = curAABB.center();
std::copy(children.cbegin(), children.cend(), std::begin(n.children));
n.regionCount = 0;
n.regionStart = 0;
}
}
void AROTBuilder::build(std::vector<std::vector<uint8_t>>& secs, const zeus::CAABox& fullAabb,
const std::vector<zeus::CAABox>& meshAabbs, const std::vector<DNACMDL::Mesh>& meshes) {
/* Recursively split */
BspNodeType rootType;
rootNode.addChild(0, AROT_MIN_MODELS, meshAabbs, fullAabb, rootType);
/* Calculate indexing metrics */
size_t totalNodeCount = 0;
size_t idxRefCount = 0;
size_t curOff = 0;
rootNode.nodeCount(totalNodeCount, idxRefCount, bmpPool, curOff);
size_t bmpWordCount = ROUND_UP_32(meshes.size()) / 32;
size_t arotSz = 64 + bmpWordCount * bmpPool.m_pool.size() * 4 + totalNodeCount * 8 + idxRefCount * 2;
/* Write header */
secs.emplace_back(arotSz, 0);
athena::io::MemoryWriter w(secs.back().data(), secs.back().size());
w.writeUint32Big('AROT');
w.writeUint32Big(1);
w.writeUint32Big(bmpPool.m_pool.size());
w.writeUint32Big(meshes.size());
w.writeUint32Big(totalNodeCount);
w.writeVec3fBig(fullAabb.min);
w.writeVec3fBig(fullAabb.max);
w.seekAlign32();
/* Write bitmap */
std::vector<uint32_t> bmpWords;
bmpWords.reserve(bmpWordCount);
for (const std::set<int>& bmp : bmpPool.m_pool) {
bmpWords.clear();
bmpWords.resize(bmpWordCount);
auto bmpIt = bmp.cbegin();
if (bmpIt != bmp.cend()) {
int curIdx = 0;
for (size_t word = 0; word < bmpWordCount; ++word) {
for (u32 b = 0; b < 32; ++b) {
if (*bmpIt == curIdx) {
bmpWords[word] |= 1U << b;
++bmpIt;
if (bmpIt == bmp.cend()) {
break;
}
}
++curIdx;
}
if (bmpIt == bmp.cend()) {
break;
}
}
}
for (uint32_t word : bmpWords)
w.writeUint32Big(word);
}
/* Write the rest */
rootNode.writeIndirectionTable(w);
rootNode.writeNodes(w, 0);
}
std::pair<std::unique_ptr<uint8_t[]>, uint32_t> AROTBuilder::buildCol(const ColMesh& mesh, BspNodeType& rootOut) {
/* Accumulate total AABB */
zeus::CAABox fullAABB;
for (const auto& vert : mesh.verts)
fullAABB.accumulateBounds(zeus::CVector3f(vert));
/* Predetermine triangle AABBs */
std::vector<zeus::CAABox> triBoxes;
triBoxes.reserve(mesh.trianges.size());
for (const ColMesh::Triangle& tri : mesh.trianges) {
zeus::CAABox& aabb = triBoxes.emplace_back();
for (const u32 edgeIdx : tri.edges) {
const ColMesh::Edge& edge = mesh.edges[edgeIdx];
for (const u32 vertIdx : edge.verts) {
const auto& vert = mesh.verts[vertIdx];
aabb.accumulateBounds(zeus::CVector3f(vert));
}
}
}
/* Recursively split */
rootNode.addChild(0, COLLISION_MIN_NODE_TRIANGLES, triBoxes, fullAABB, rootOut);
/* Calculate offsets and write out */
size_t totalSize = 0;
rootNode.colSize(totalSize);
std::unique_ptr<uint8_t[]> ret(new uint8_t[totalSize]);
uint8_t* ptr = ret.get();
rootNode.writeColNodes(ptr, fullAABB);
return {std::move(ret), totalSize};
}
void AROTBuilder::buildPath(DNAMP1::PATH& path) {
/* Accumulate total AABB and gather region boxes */
std::vector<zeus::CAABox> regionBoxes;
regionBoxes.reserve(path.regions.size());
zeus::CAABox fullAABB;
for (const DNAMP1::PATH::Region& r : path.regions) {
regionBoxes.emplace_back(r.aabb[0], r.aabb[1]);
fullAABB.accumulateBounds(regionBoxes.back());
}
/* Recursively split */
BspNodeType dontCare;
rootNode.addChild(0, PATH_MIN_NODE_REGIONS, regionBoxes, fullAABB, dontCare);
/* Write out */
size_t nodeCount = 0;
size_t lookupCount = 0;
rootNode.pathCountNodesAndLookups(nodeCount, lookupCount);
path.octreeNodeCount = nodeCount;
path.octree.reserve(nodeCount);
path.octreeRegionLookupCount = lookupCount;
path.octreeRegionLookup.reserve(lookupCount);
rootNode.pathWrite(path, fullAABB);
}
} // namespace DataSpec
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