From 17840716d03d087fec54d19bcbf43dfe97fe4665 Mon Sep 17 00:00:00 2001
From: scawful <justin.scofield@outlook.com>
Date: Wed, 19 Jun 2024 11:26:18 -0400
Subject: [PATCH] add expanded special areas table, allow for additional entry
 points

---
 Overworld/overworld.asm     |   6 +-
 Overworld/special_areas.asm | 252 ++++++++++++++++++++++++++++++++++++
 2 files changed, 256 insertions(+), 2 deletions(-)
 create mode 100644 Overworld/special_areas.asm

diff --git a/Overworld/overworld.asm b/Overworld/overworld.asm
index b367bcb..f25744b 100644
--- a/Overworld/overworld.asm
+++ b/Overworld/overworld.asm
@@ -86,6 +86,10 @@ LoadOverworldPitAreas:
   RTL
 }
 
+pushpc
+
+incsrc "Overworld/special_areas.asm"
+
 org $0794D9
   ; LDA $8A : CMP #$57 : BEQ .overworld_pit_transition
   JSL LoadOverworldPitAreas : BCC .overworld_pit_transition
@@ -93,5 +97,3 @@ org $0794D9
   RTS
 .overworld_pit_transition
 
-; incsrc "Overworld/special_areas.asm"
-
diff --git a/Overworld/special_areas.asm b/Overworld/special_areas.asm
new file mode 100644
index 0000000..365ec72
--- /dev/null
+++ b/Overworld/special_areas.asm
@@ -0,0 +1,252 @@
+; =========================================================
+
+org $0EDE49
+JSL Overworld_CheckForSpecialOverworldTrigger
+RTL
+
+pullpc
+
+Overworld_CheckForSpecialOverworldTrigger:
+{
+  PHB : PHK : PLB
+
+  REP #$31
+
+  JSR GetMap16Tile
+
+  LDA.l Map16Definitions,X : AND.w #$01FF : STA.b $00
+
+  LDX.w #$000A
+
+  .check_next_screen
+  LDA.b $00
+
+  .check_next_tile
+  DEX
+  DEX
+  BMI .exit
+
+  CMP.l .tile_type,X : BNE .check_next_tile
+
+  LDA.b $8A : CMP.l .screen_id, X : BNE .check_next_screen
+
+  ;--------------------------------------------------------
+
+  LDA.l .special_id,X
+  STA.b $A0
+
+  SEP #$20
+
+  LDA.l .direction,X
+  STA.b $67
+
+  STA.w $0410
+  STA.w $0416
+
+  LDX.w #$0004
+
+  .continue_shifting
+  DEX
+
+  LSR A
+  BCC .continue_shifting
+
+  STX.w $0418
+  STX.w $069C
+
+  LDA.b #$17
+  STA.b $11
+
+  LDA.b #$0B
+  STA.b $10
+
+  .exit
+  SEP #$30
+
+  PLB
+
+  RTL
+
+  ; .tile_type
+  ; dw $0105
+  ; dw $01E4
+  ; dw $00AD
+  ; dw $00B9
+
+  ; .screen_id
+  ; dw $0000 ; OW 00
+  ; dw $002D ; OW 2D
+  ; dw $000F ; OW 0F
+  ; dw $0081 ; OW 81
+
+  ; .direction
+  ; dw $0008
+  ; dw $0002
+  ; dw $0008
+  ; dw $0008
+
+  ; .special_id
+  ; dw $0180 ; OW 80
+  ; dw $0181 ; OW 81
+  ; dw $0182 ; OW 82
+  ; dw $0189 ; OW 89
+
+  ; corresponding warp types that lead to special overworld areas
+  .tile_type
+  dw $01EF, $01EF, $00AD, $00B9, $01EF
+  
+  ; Lost woods, Hyrule Castle Bridge, Entrance to Zora falls, and in Zora Falls...
+  .screen_id
+  dw $002A, $0018, $000F, $0081, $0017
+  
+  ; Direction Link will face when he enters the special area
+  .direction
+  dw $0008, $0008, $0008, $0008, $0008
+  
+  ; Exit value for the special area. In Hyrule Magic these are those White markers.
+  .special_id
+  dw $0180, $0181, $0182, $0189, $0181
+}
+
+
+GetMap16Tile:
+{
+  LDA.b $20
+  CLC
+  ADC.w #$000C
+  STA.b $00
+
+  SEC
+  SBC.w $0708
+
+  AND.w $070A
+  ASL A
+  ASL A
+  ASL A
+  STA.b $06
+
+  LDA.b $22
+  CLC
+  ADC.w #$0008
+
+  LSR A
+  LSR A
+  LSR A
+  STA.b $02
+
+  SEC
+  SBC.w $070C
+
+  AND.w $070E
+  CLC
+  ADC.b $06
+
+  TAY
+  TAX
+
+  LDA.l $7E2000,X
+  ASL A
+  ASL A
+  ASL A
+  TAX
+
+  RTS
+}
+
+#EXIT_0EDEE0:
+SEP #$30
+
+RTL
+
+; =========================================================
+
+SpecialOverworld_CheckForReturnTrigger:
+{
+  REP #$31
+
+  JSR GetMap16Tile
+
+  LDA.l Map16Definitions,X
+  AND.w #$01FF
+  STA.b $00
+
+  LDX.w #$0006
+
+  .check_next_screen
+  LDA.b $00
+
+  .check_next_tile
+  DEX
+  DEX
+  BMI EXIT_0EDEE0
+
+  CMP.l .tile_type,X
+  BNE .check_next_tile
+
+  LDA.b $8A
+  CMP.l .screen_id,X
+  BNE .check_next_screen
+
+  SEP #$30
+
+  LDA.l .direction,X
+  STA.b $67
+
+  LDX.b #$04
+
+  .keep_shifting
+  DEX
+
+  LSR A
+  BCC .keep_shifting
+
+  TXA
+  STA.w $0418
+
+  LDA.b $67
+
+  LDX.b #$04
+
+  .just_keep_shifting
+  DEX
+
+  LSR A
+  BCC .just_keep_shifting
+
+  TXA
+  STA.w $069C
+
+  LDA.b #$24
+  STA.b $11
+
+  STZ.b $B0
+  STZ.b $A0
+
+  RTL
+
+  .tile_type
+  dw $017C
+  dw $01E4
+  dw $00AD
+
+  .screen_id
+  dw $0080 ; OW 80
+  dw $0080 ; OW 80
+  dw $0081 ; OW 81
+
+  .direction
+  dw $0004
+  dw $0001
+  dw $0004
+}
+
+LoadExpandedSpecialArea:
+{
+  LDA.b $A0 : CMP.w #$0191 : BNE .not_minish_woods
+    LDA.w #$0180 : STA.b $A0
+  .not_minish_woods
+  RTL
+}
+
+org $02E90E
+JSL LoadExpandedSpecialArea : NOP