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#include <common.h>
#include <game.h>
const char *GetTilesetName(void *cls, int areaNum, int slotNum);
void DoFixes(int areaNumber, int slotNumber);
void SwapObjData(u8 *data, int slotNumber);
extern "C" void *OriginalTilesetLoadingThing(void *, void *, int, int);
// Main hook
void *TilesetFixerHack(void *cls, void *heap, int areaNum, int layerNum) {
if (layerNum == 0) {
for (int i = 1; i < 4; i++) {
DoFixes(areaNum, i);
}
}
return OriginalTilesetLoadingThing(cls, heap, areaNum, layerNum);
}
// File format definitions
struct ObjLookupEntry {
u16 offset;
u8 width;
u8 height;
};
void DoFixes(int areaNumber, int slotNumber) {
// This is where it all starts
const char *tsName = GetTilesetName(BGDatClass, areaNumber, slotNumber);
if (tsName == 0 || tsName[0] == 0) {
return;
}
char untHDname[64], untname[64];
snprintf(untHDname, 64, "BG_unt/%s_hd.bin", tsName);
snprintf(untname, 64, "BG_unt/%s.bin", tsName);
u32 unt_hd_length;
void *bg_unt_hd_data = DVD_GetFile(GetDVDClass2(), tsName, untHDname, &unt_hd_length);
void *bg_unt = DVD_GetFile(GetDVDClass2(), tsName, untname);
ObjLookupEntry *lookups = (ObjLookupEntry*)bg_unt_hd_data;
int objCount = unt_hd_length / sizeof(ObjLookupEntry);
for (int i = 0; i < objCount; i++) {
// process each object
u8 *thisObj = (u8*)((u32)bg_unt + lookups[i].offset);
SwapObjData(thisObj, slotNumber);
}
}
void SwapObjData(u8 *data, int slotNumber) {
// rudimentary parser which will hopefully work
while (*data != 0xFF) {
u8 cmd = *data;
if (cmd == 0xFE || (cmd & 0x80) != 0) {
data++;
continue;
}
if ((data[2] & 3) != 0) {
data[2] &= 0xFC;
data[2] |= slotNumber;
}
data += 3;
}
}
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