Martin Michelsen
25 lines
615 B
C++
25 lines
615 B
C++
#include "RareItemSet.hh"
|
|
|
|
#include <phosg/Filesystem.hh>
|
|
#include <phosg/Random.hh>
|
|
|
|
using namespace std;
|
|
|
|
|
|
|
|
RareItemSet::RareItemSet(const char* filename, uint8_t episode,
|
|
uint8_t difficulty, uint8_t secid) {
|
|
scoped_fd fd(filename, O_RDONLY);
|
|
size_t offset = (episode * 0x6400) + (difficulty * 0x1900) + (secid * 0x0280);
|
|
preadx(fd, this, sizeof(*this), offset);
|
|
}
|
|
|
|
bool sample_rare_item(mt19937& random, uint8_t pc) {
|
|
int8_t shift = ((pc >> 3) & 0x1F) - 4;
|
|
if (shift < 0) {
|
|
shift = 0;
|
|
}
|
|
uint32_t rate = ((2 << shift) * ((pc & 7) + 7));
|
|
return (random() < rate);
|
|
}
|