Martin Michelsen
39 lines
1.0 KiB
C++
39 lines
1.0 KiB
C++
#include "RareItemSet.hh"
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#include <phosg/Filesystem.hh>
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#include <phosg/Random.hh>
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using namespace std;
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RareItemSet::RareItemSet(shared_ptr<const string> data) : data(data) {
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if (this->data->size() != sizeof(Table) * 10 * 4 * 3) {
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throw runtime_error("data file size is incorrect");
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}
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this->tables = reinterpret_cast<const Table*>(this->data->data());
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}
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const RareItemSet::Table& RareItemSet::get_table(
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uint8_t episode, uint8_t difficulty, uint8_t secid) const {
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if (episode > 2) {
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throw logic_error("incorrect episode number");
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}
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if (difficulty > 3) {
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throw logic_error("incorrect difficulty");
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}
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if (secid > 10) {
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throw logic_error("incorrect section id");
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}
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return this->tables[(episode * 10 * 4) + (difficulty * 10) + secid];
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}
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bool RareItemSet::sample(mt19937& random, uint8_t pc) {
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int8_t shift = ((pc >> 3) & 0x1F) - 4;
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if (shift < 0) {
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shift = 0;
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}
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uint32_t rate = ((2 << shift) * ((pc & 7) + 7));
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return (random() < rate);
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}
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