Links Awakening: Implement New Game (#1334)

Adds Link's Awakening: DX. Fully imports and forks LADXR, with permission - https://github.com/daid/LADXR

worlds/ladx/LADXR/patches/witch.py

@@ -0,0 +1,58 @@
+from ..assembler import ASM
+from ..roomEditor import RoomEditor
+
+
+def updateWitch(rom):
+    # Add a heartpiece at the toadstool, the item patches turn this into a 1 time toadstool item
+    # Or depending on flags, in something else.
+    re = RoomEditor(rom, 0x050)
+    re.addEntity(2, 3, 0x35)
+    re.store(rom)
+
+    # Change what happens when you trade the toadstool with the witch
+    #  Note that the 2nd byte of this code gets patched with the item to give from the witch.
+    rom.patch(0x05, 0x08D4, 0x08F0, ASM("""
+        ; Get the room flags and mark the witch as done.
+        ld  hl, $DAA2
+        ld  a, [hl]
+        and $30
+        set 4, [hl]
+        set 5, [hl]
+        jr  z, item
+powder:
+        ld  e, $09 ; give powder every time after the first time.
+        ld  a, e
+        ldh [$F1], a
+        ld  a, $11
+        rst 8
+        jp $48F0
+item:
+        ld   a, $0E
+        rst 8
+    """), fill_nop=True)
+
+    # Patch the toadstool to unload when you haven't delivered something to the witch yet.
+    rom.patch(0x03, 0x1D4B, ASM("""
+        ld   hl, $DB4B
+        ld   a, [$DB4C]
+        or   [hl]
+        jp   nz, $3F8D
+    """), ASM("""
+        ld   a, [$DAA2]
+        and  $20
+        jp   z, $3F8D
+    """), fill_nop=True)
+
+    # Patch what happens when we pickup the toadstool, call our chest code to give a toadstool.
+    rom.patch(0x03, 0x1D6F, 0x1D7D, ASM("""
+        ld   a, $50
+        ldh  [$F1], a
+        ld  a, $02 ; give item
+        rst 8
+
+        ld   hl, $DAA2
+        res  5, [hl]
+    """), fill_nop=True)
+
+def witchIsPatched(rom):
+    return sum(rom.banks[0x05][0x08D4:0x08F0]) != 0x0DC2