From 0aae0eed9a74a463852f6548e282c10b6c632cf2 Mon Sep 17 00:00:00 2001
From: Treeki <treeki@gmail.com>
Date: Mon, 28 Mar 2011 00:04:21 +0200
Subject: Pa1/2/3 tilesets can now be swapped into any slot, except for
 animations

---
 src/tilesetfixer.cpp | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 src/tilesetfixer.cpp

(limited to 'src')

diff --git a/src/tilesetfixer.cpp b/src/tilesetfixer.cpp
new file mode 100644
index 0000000..a66fc14
--- /dev/null
+++ b/src/tilesetfixer.cpp
@@ -0,0 +1,94 @@
+#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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