Martin Michelsen
26 lines
625 B
C++
26 lines
625 B
C++
#include "RareItemSet.hh"
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#include <phosg/Filesystem.hh>
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using namespace std;
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RareItemSet::RareItemSet(const char* filename, uint8_t episode,
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uint8_t difficulty, uint8_t secid) {
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scoped_fd fd(filename, O_RDONLY);
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size_t offset = (episode * 0x6400) + (difficulty * 0x1900) + (secid * 0x0280);
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preadx(fd, this, sizeof(*this), offset);
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}
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bool sample_rare_item(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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uint32_t x = ((rand() << 30) | (rand() << 15) | rand());
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return (x < rate);
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}
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