Allow 4 unique signs in each large OW screen

dialog.asm

@@ -419,6 +419,29 @@ Sprite_ShowMessageMinimal_Alt:
 Main_ShowTextMessage_Alt_already_in_text_mode:
 RTL
 
+CalculateSignIndex:
+  ; for the big 1024x1024 screens we are calculating link's effective
+  ; screen area, as though the screen was 4 different 512x512 screens.
+  ; And we do this in a way that will likely give the right value even 
+  ; with major glitches.
+
+  LDA $8A : ASL A : TAY ;what we wrote over
+
+  LDA $0712 : BEQ .done ; If a small map, we can skip these calculations.
+
+  LDA $21 : AND.w #$0002 : ASL #2 : EOR $8A : AND.w #$0008 : BEQ +
+  	TYA : !ADD.w #$0010 : TAY  ;add 16 if we are in lower half of big screen.
+  + 
+
+  LDA $23 : AND.w #$0002 : LSR : EOR $8A : AND.w #$0001 : BEQ +
+  TYA : INC #2 : TAY  ;add 16 if we are in lower half of big screen.
+  +
+  ; ensure even if things go horribly wrong, we don't read the sign out of bounds and crash:
+  TYA : AND.w #$00FF : TAY 
+
+.done
+RTL
+
 ;--------------------------------------------------------------------------------
 ; A0 - A9 - 0 - 9
 ; AA - C3 - A - Z

hooks.asm

@@ -1818,6 +1818,9 @@ dw $05AC, $04FC, $0001, $0027, $00F0 ; Zelda in the water room
 ; org $01CA66 ; <- CA66 Bank01.asm : 10864 - (LDA.w #$2200 : ADD $041C : STA $041C)
 ; LDA.w #$4400 ; #$2200 is the normal speed, $#FF00 is max.
 ;----------------------------------------------------------
+;-- New Sign table offet calculation
+org $07b4fe ; <- 3b4fe - bank07.asm : 8454 (LDA $8A : ASL A : TAY)
+JSL CalculateSignIndex
 
 ;================================================================================
 ; Ganon Fixes

tables.asm

@@ -530,25 +530,30 @@ Music_GTower:
 db $16
 
 ;--------------------------------------------------------------------------------
-; OWG EDM bridge sign text pointer (Message id of the map05)
+; OWG EDM bridge sign text pointer (Message id of the upper left of map05 = map05)
 ;--------------------------------------------------------------------------------
 org $07F501
 dw #$018E
 ;--------------------------------------------------------------------------------
-; GT sign text pointer (Message id of the map43)
+; GT sign text pointer (Message id of the upper right of map43 = map44)
 ;--------------------------------------------------------------------------------
-org $07F57D
+org $07F57F
 dw #$0190
 ;--------------------------------------------------------------------------------
-; Pyramid sign text pointer (Message id of the map5B)
+; Pyramid sign text pointer (Message id of the upper left of map5B = map5B)
 ;--------------------------------------------------------------------------------
 org $07F5AD
 dw #$0191
 ;--------------------------------------------------------------------------------
-; HC (inverted) sign text pointer (Message id of the map1B)
+; HC (inverted) left sign text pointer (Message id of the upper left of map1B = map1B)
 ;--------------------------------------------------------------------------------
 org $07F52D
 dw #$0190
+;--------------------------------------------------------------------------------
+; HC (inverted) right sign text pointer (Message id of the upper right of map1B = map1C)
+;--------------------------------------------------------------------------------
+org $07F52F
+dw #$0191
 
 ;--------------------------------------------------------------------------------
 ;Map Pendant / Crystal Indicators