forked from FireEmblemUniverse/fireemblem8u
/
monstergen.c
79 lines (69 loc) · 2.27 KB
/
monstergen.c
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#include "global.h"
#include "rng.h"
#include "monstergen.h"
/*
* Random monster unit generation utility
* (for skirmishes and valni/lagdou)
*/
int SelectFromWeightedArray(const u8 *weights, u8 size) {
char i;
char rand = NextRN_100();
const char *iter = weights;
char old_count = 0;
char new_count = 0;
for (i = 0; i < size; ++iter, ++i) {
old_count = new_count;
new_count += *iter;
if (old_count <= rand && rand < new_count) {
return i;
}
}
return 0xff;
}
int GenerateMonsterLevel(u8 baseLevel) {
char result = baseLevel;
u8 selected = SelectFromWeightedArray(gMonsterLevelWeights, 7);
result += selected - 2;
if ((s8) result <= 0) {
result = 1;
}
if ((s8) result > 20) {
result = 20;
}
return result;
}
int GenerateMonsterClass(u8 baseClassId) {
const struct MonsterClassWeights *weights = gMonsterClassWeights + baseClassId;
u8 selected = SelectFromWeightedArray(weights->weights, 5);
return weights->classes[selected];
}
u32 GenerateMonsterItems(u8 classId) {
const struct MonsterItemsByClassEntry *iter = gMonsterItemsByClassIndex;
for (iter = gMonsterItemsByClassIndex; iter->classId != 0xff; ++iter)
{
if (iter->classId == classId) {
u32 item1row;
u32 item1weightsidx;
u32 item1;
u8 row1, col1, row2, col2;
row1 = SelectFromWeightedArray(iter->item1weights, 5);
item1row = iter->item1row[row1];
item1weightsidx = iter->item1tables[row1];
col1 = SelectFromWeightedArray(gMonsterItemWeightsTable[item1weightsidx], 5);
item1 = gMonsterItemTable[item1row][col1] << 0x10;
row2 = SelectFromWeightedArray(iter->item2weights, 5);
if (row2 != 0xff) {
u32 item2row = iter->item2row[row2];
if (item2row) {
u32 item2;
u32 item2weightsidx = iter->item2tables[row2];
col2 = SelectFromWeightedArray(gMonsterItemWeightsTable[item2weightsidx], 5);
item2 = gMonsterItemTable[item2row][col2];
return item1 | item2;
}
}
return item1;
}
}
return 0;
}