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#include <common.h>
#include <game.h>
extern void *BGDatClass, *StagePtr;
const char *GetTilesetName(void *cls, int areaNum, int slotNum);
asm int GetAreaNum() {
nofralloc
lis r9, StagePtr@h
ori r9, r9, StagePtr@l
lwz r9, 0(r9)
lbz r3, 0x120E(r9)
blr
}
void DoFixes(int slotNumber);
void SwapObjData(u8 *data, int slotNumber);
// Main hook
void TilesetFixerHack() {
for (int i = 1; i < 4; i++) {
DoFixes(i);
}
}
// File format definitions
struct ObjLookupEntry {
u16 offset;
u8 width;
u8 height;
};
void DoFixes(int slotNumber) {
// This is where it all starts
const char *tsName = GetTilesetName(BGDatClass, GetAreaNum(), slotNumber);
if (tsName == 0 || tsName[0] == 0) {
OSReport("Skipping set %d\n", slotNumber);
return;
}
OSReport("Processing %d = %s\n", slotNumber, tsName);
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);
OSReport("Unt: %p - Unt_HD: %p\n", bg_unt, bg_unt_hd_data);
ObjLookupEntry *lookups = (ObjLookupEntry*)bg_unt_hd_data;
int objCount = unt_hd_length / sizeof(ObjLookupEntry);
OSReport("%d objects\n", objCount);
for (int i = 0; i < objCount; i++) {
// process each object
u8 *thisObj = (u8*)((u32)bg_unt + lookups[i].offset);
//OSReport("processing %d[%p][%04x]\n", i, thisObj, lookups[i].offset);
SwapObjData(thisObj, slotNumber);
}
}
void SwapObjData(u8 *data, int slotNumber) {
// rudimentary parser which will hopefully work
while (*data != 0xFF) {
u8 cmd = *data;
//OSReport("Command: %02x\n", cmd);
if (cmd == 0xFE || (cmd & 0x80) != 0) {
data++;
continue;
}
if ((data[2] & 3) != 0) {
data[2] &= 0xFC;
data[2] |= slotNumber;
}
data += 3;
}
//OSReport("Ended @ %p\n", data);
}
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