206 lines
6.3 KiB
C++
206 lines
6.3 KiB
C++
#include <limits>
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#include <iostream>
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#include <vector>
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using std::cerr;
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using std::endl;
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#include "mph_index.h"
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using std::vector;
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namespace {
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static const uint8_t kUnassigned = 3;
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// table used for looking up the number of assigned vertices to a 8-bit integer
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static uint8_t kBdzLookupIndex[] =
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{
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
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3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
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3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
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3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
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2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 1, 1, 1, 1, 0
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};
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} // anonymous namespace
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namespace cxxmph {
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MPHIndex::~MPHIndex() {
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clear();
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}
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void MPHIndex::clear() {
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delete [] ranktable_;
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ranktable_ = NULL;
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ranktable_size_ = 0;
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// TODO(davi) implement me
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}
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bool MPHIndex::GenerateQueue(
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TriGraph* graph, vector<uint32_t>* queue_output) {
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uint32_t queue_head = 0, queue_tail = 0;
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uint32_t nedges = m_;
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uint32_t nvertices = n_;
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// Relies on vector<bool> using 1 bit per element
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vector<bool> marked_edge(nedges + 1, false);
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vector<uint32_t> queue(nvertices, 0);
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for (uint32_t i = 0; i < nedges; ++i) {
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const TriGraph::Edge& e = graph->edges()[i];
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if (graph->vertex_degree()[e[0]] == 1 ||
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graph->vertex_degree()[e[1]] == 1 ||
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graph->vertex_degree()[e[2]] == 1) {
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if (!marked_edge[i]) {
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queue[queue_head++] = i;
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marked_edge[i] = true;
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}
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}
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}
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/*
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for (unsigned int i = 0; i < marked_edge.size(); ++i) {
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cerr << "vertex with degree " << static_cast<uint32_t>(graph->vertex_degree()[i]) << " marked " << marked_edge[i] << endl;
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}
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for (unsigned int i = 0; i < queue.size(); ++i) {
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cerr << "vertex " << i << " queued at " << queue[i] << endl;
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}
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*/
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// At this point queue head is the number of edges touching at least one
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// vertex of degree 1.
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// cerr << "Queue head " << queue_head << " Queue tail " << queue_tail << endl;
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// graph->DebugGraph();
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while (queue_tail != queue_head) {
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uint32_t current_edge = queue[queue_tail++];
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graph->RemoveEdge(current_edge);
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const TriGraph::Edge& e = graph->edges()[current_edge];
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for (int i = 0; i < 3; ++i) {
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uint32_t v = e[i];
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if (graph->vertex_degree()[v] == 1) {
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uint32_t first_edge = graph->first_edge()[v];
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if (!marked_edge[first_edge]) {
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queue[queue_head++] = first_edge;
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marked_edge[first_edge] = true;
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}
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}
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}
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}
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/*
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for (unsigned int i = 0; i < queue.size(); ++i) {
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cerr << "vertex " << i << " queued at " << queue[i] << endl;
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}
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*/
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int cycles = queue_head - nedges;
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if (cycles == 0) queue.swap(*queue_output);
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return cycles == 0;
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}
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void MPHIndex::Assigning(
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const vector<TriGraph::Edge>& edges, const vector<uint32_t>& queue) {
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uint32_t current_edge = 0;
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vector<bool> marked_vertices(n_ + 1);
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dynamic_2bitset().swap(g_);
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// Initialize vector of half nibbles with all bits set.
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dynamic_2bitset g(n_, true /* set bits to 1 */);
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uint32_t nedges = m_; // for legibility
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for (int i = nedges - 1; i + 1 >= 1; --i) {
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current_edge = queue[i];
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const TriGraph::Edge& e = edges[current_edge];
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/*
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cerr << "B: " << e[0] << " " << e[1] << " " << e[2] << " -> "
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<< get_2bit_value(g_, e[0]) << " "
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<< get_2bit_value(g_, e[1]) << " "
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<< get_2bit_value(g_, e[2]) << " edge " << current_edge << endl;
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*/
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if (!marked_vertices[e[0]]) {
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if (!marked_vertices[e[1]]) {
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g.set(e[1], kUnassigned);
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marked_vertices[e[1]] = true;
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}
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if (!marked_vertices[e[2]]) {
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g.set(e[2], kUnassigned);
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assert(marked_vertices.size() > e[2]);
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marked_vertices[e[2]] = true;
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}
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g.set(e[0], (6 - (g[e[1]] + g[e[2]])) % 3);
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marked_vertices[e[0]] = true;
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} else if (!marked_vertices[e[1]]) {
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if (!marked_vertices[e[2]]) {
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g.set(e[2], kUnassigned);
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marked_vertices[e[2]] = true;
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}
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g.set(e[1], (7 - (g[e[0]] + g[e[2]])) % 3);
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marked_vertices[e[1]] = true;
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} else {
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g.set(e[2], (8 - (g[e[0]] + g[e[1]])) % 3);
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marked_vertices[e[2]] = true;
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}
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/*
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cerr << "A: " << e[0] << " " << e[1] << " " << e[2] << " -> "
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<< static_cast<uint32_t>(g[e[0]]) << " "
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<< static_cast<uint32_t>(g[e[1]]) << " "
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<< static_cast<uint32_t>(g[e[2]]) << " " << endl;
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*/
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}
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g_.swap(g);
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}
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void MPHIndex::Ranking() {
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uint32_t nbytes_total = static_cast<uint32_t>(ceil(n_ / 4.0));
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uint32_t size = k_ >> 2U;
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ranktable_size_ = static_cast<uint32_t>(
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ceil(n_ / static_cast<double>(k_)));
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delete [] ranktable_;
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ranktable_ = NULL;
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uint32_t* ranktable = new uint32_t[ranktable_size_];
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memset(ranktable, 0, ranktable_size_*sizeof(uint32_t));
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uint32_t offset = 0;
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uint32_t count = 0;
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uint32_t i = 1;
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while (1) {
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if (i == ranktable_size_) break;
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uint32_t nbytes = size < nbytes_total ? size : nbytes_total;
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for (uint32_t j = 0; j < nbytes; ++j) count += kBdzLookupIndex[g_[offset + j]];
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ranktable[i] = count;
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offset += nbytes;
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nbytes_total -= size;
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++i;
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}
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ranktable_ = ranktable;
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}
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uint32_t MPHIndex::Rank(uint32_t vertex) const {
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uint32_t index = vertex >> b_;
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uint32_t base_rank = ranktable_[index];
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uint32_t beg_idx_v = index << b_;
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uint32_t beg_idx_b = beg_idx_v >> 2;
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uint32_t end_idx_b = vertex >> 2;
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while (beg_idx_b < end_idx_b) base_rank += kBdzLookupIndex[g_.data()[beg_idx_b++]];
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beg_idx_v = beg_idx_b << 2;
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// cerr << "beg_idx_v: " << beg_idx_v << endl;
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// cerr << "base rank: " << base_rank << endl;
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// cerr << "G: ";
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// for (unsigned int i = 0; i < n_; ++i) {
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// cerr << static_cast<uint32_t>(g_[i]) << " ";
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// }
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// cerr << endl;
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while (beg_idx_v < vertex) {
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if (g_[beg_idx_v] != kUnassigned) ++base_rank;
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++beg_idx_v;
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}
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// cerr << "Base rank: " << base_rank << endl;
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return base_rank;
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}
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} // namespace cxxmph
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