Prevent Link from taking spike floor damage while jumping

Additionally, changes the jump state to use the ledge hop mode rather than the recoil animation

Items/jump_feather.asm

@@ -1,66 +1,95 @@
-; =============================================================================
+; =========================================================
 ; Zarby Feather 
 
 org $07AFF8 ; LinkItem_BugCatchingNet
 {
-  BIT $3A : BVS .return ;if Y or B are already pressed
+    BIT $3A : BVS .return ;if Y or B are already pressed
-
+      LDA $6C : BNE .return ; if we are standing in a dooray or not
-  LDA $6C : BNE .return ; if we are standing in a dooray or not
+        ; Link_CheckNewY_ButtonPress
-
+        JSR $B073 : BCC .return ; Check if we just pressed Y Button  
-  ; Link_CheckNewY_ButtonPress
+          JSL LinkItem_JumpFeather
-  JSR $B073 : BCC .return ; Check if we just pressed Y Button  
+  .return
-  JSL NewBookCode
+    RTS
-
-.return
-  RTS
 }
 
-; =============================================================================
+; =========================================================
+; Prevent Link from taking damage while jumping spikes
+; The game originally differentiates between your armor 
+; for the damage take, however the table has all the same
+; values, so it's effectively useless. 
+
+; TileDetect_MainHandler_no_moon_pearl
+; org $07D23D
+org $07D242
+  JSL CheckIfJumpingForSpikeDamage
+  NOP #2
+warnpc $07D248
+
+; =========================================================
 
 org $2B8000
-NewBookCode:
+LinkItem_JumpFeather:
 {
   JSL $07983A ; Reset swim state
   LDA $46 : BNE .cantuseit
-  LDA #$02 : STA $5D ; state recoil
+    LDA #$02 : STA $5D ; set link state recoil
-  LDA #$01 : STA $4D ; state recoil 2
+    LDA #$02 : STA $4D ; set jumping state (ledge hop)
 
-  ; Length of the jump
+    ; Length of the jump
-  LDA #$20 
+    LDA #$20 : STA $46 
 
-  STA $46 
+    ; Height of the jump
+    LDA #$24 
 
-  ; Height of the jump
+    ; Set vertical resistance 
-  LDA #$24 
+    STA $29
+    STA $02C7
 
-  ; Set vertical resistance 
+    ; Set Links direction to right(?)
-  STA $29
+    LDA #$08 : STA $0340 : STA $67
-  STA $02C7
-  ; Set Links direction to right(?)
-  LDA #$08 : STA $0340 : STA $67
 
-  ; Reset Link movement offsets 
+    ; Reset Link movement offsets 
-  STZ $31
+    STZ $31 : STZ $30
-  STZ $30
+
+      LDA $F4 : AND #$08 : BEQ .noUp
+        LDA #-8 ; Change that -8 if you want higher speed moving up
+        STA $27 ; Vertical recoil
+    .noUp
+      LDA $F4 : AND #$04 : BEQ .noDown
+        LDA #8  ; Change that -8 if you want higher speed moving down
+        STA $27
+    .noDown
+      LDA $F4 : AND #$02 : BEQ .noLeft
+        LDA #-8 ; Change that -8 if you want higher speed moving left
+        STA $28 ; Horizontal recoil
+    .noLeft
+      LDA $F4 : AND #$01 : BEQ .noRight
+        LDA #8  ; Change that 8 if you want higher speed moving right
+        STA $28
+    .noRight
     
-  LDA $F4 : AND #$08 : BEQ .noUp
-      LDA #-8 ; Change that -8 if you want higher speed moving up
-      STA $27 ; Vertical recoil
-  .noUp
-  LDA $F4 : AND #$04 : BEQ .noDown
-      LDA #8  ; Change that -8 if you want higher speed moving down
-      STA $27
-  .noDown
-  LDA $F4 : AND #$02 : BEQ .noLeft
-      LDA #-8 ; Change that -8 if you want higher speed moving left
-      STA $28 ; Horizontal recoil
-  .noLeft
-  LDA $F4 : AND #$01 : BEQ .noRight
-      LDA #8  ; Change that 8 if you want higher speed moving right
-      STA $28
-  .noRight
   .cantuseit
-  RTL
+    RTL
+}
+
+; =========================================================
+; Y contains our armor value
+; Currently requires a very close jump and will still
+; damage the player midair if you jump from too far away.
+
+CheckIfJumpingForSpikeDamage:
+{
+    PHB : PHK : PLB
+    LDA $29 : BNE .airborne
+      LDA.w .spike_floor_damage, Y : STA.w $0373
+  .airborne
+    PLB
+    RTL
+
+  .spike_floor_damage
+    db $08 ; green
+    db $08 ; blue
+    db $04 ; red
 }
 
 print  "End of Items/jump_feather.asm     ", pc