Cleanup HandleTileDirections fn
This commit is contained in:
scawful
@@ -212,7 +212,7 @@ Sprite_Minecart_Main:
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LDA !LinkCarryOrToss : AND #$03 : BNE .lifting
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JSR CheckIfPlayerIsOn : BCC .not_ready
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LDA $F4 : AND.b #$80 : BEQ .not_ready ; Check for B button
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LDA $F4 : AND.b #$80 : BEQ .not_ready ; Check for B button
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JSL Player_HaltDashAttack ; Stop the player from dashing
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LDA #$02 : STA $02F5 ; Somaria platform and moving
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@@ -246,7 +246,7 @@ Sprite_Minecart_Main:
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LDA !LinkCarryOrToss : AND #$03 : BNE .lifting
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JSR CheckIfPlayerIsOn : BCC .not_ready
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LDA $F4 : AND.b #$80 : BEQ .not_ready ; Check for B button
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LDA $F4 : AND.b #$80 : BEQ .not_ready ; Check for B button
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JSL Player_HaltDashAttack ; Stop the player from dashing
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LDA #$02 : STA $02F5 ; Somaria platform and moving
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@@ -388,6 +388,11 @@ Sprite_Minecart_Main:
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; Currently, depending on where the tile is placed the
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; cart may make a turn too early and appear to be off center.
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North = $00
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East = $01
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South = $02
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West = $03
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SetTileLookupPosBasedOnDirection:
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{
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; Based on the direction of the Minecart, adjust the
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@@ -441,66 +446,66 @@ HandleTileDirections:
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; Load the tile index
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LDA $0FA5 : CLC : CMP.b #$01 : BNE .not_out_of_bounds
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; If the tile is out of bounds, release the cart
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LDA #$40 : STA SprTimerD, X
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%GotoAction(6) ; Minecart_Release
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RTS
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; If the tile is out of bounds, release the cart
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LDA #$40 : STA SprTimerD, X
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%GotoAction(6) ; Minecart_Release
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RTS
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.not_out_of_bounds
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; Check if the tile is a stop tile
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CLC : CMP.b #$B7 : BCS .check_stop ; If tile ID is >= $B8, check for stop tiles
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.check_stop
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CLC : CMP.b #$B7 : BEQ .stop_north
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CLC : CMP.b #$B8 : BEQ .stop_south
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CLC : CMP.b #$B9 : BEQ .stop_west
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CLC : CMP.b #$BA : BEQ .stop_east
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JMP .check_for_movement ; if none of the above, continue with normal logic
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.check_stop
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CLC : CMP.b #$B7 : BEQ .stop_north
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CLC : CMP.b #$B8 : BEQ .stop_south
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CLC : CMP.b #$B9 : BEQ .stop_west
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CLC : CMP.b #$BA : BEQ .stop_east
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JMP .check_for_movement ; if none of the above, continue with normal logic
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.stop_north
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; Set the new direction to north and flip the cart's orientation
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LDA.b #South : STA SprSubtype, X : STA.w !MinecartDirection
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LDA #$01 : STA !SpriteDirection, X
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JMP .go_vert
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.stop_south
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; Set the new direction to south and flip the cart's orientation
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LDA.b #North : STA SprSubtype, X : STZ.w !MinecartDirection
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LDA #$00 : STA !SpriteDirection, X
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.stop_north
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; Set the new direction to north and flip the cart's orientation
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LDA.b #South : STA SprSubtype, X : STA.w !MinecartDirection
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LDA #$01 : STA !SpriteDirection, X
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JMP .go_vert
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.go_vert
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%SetTimerA($40)
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%StopCart()
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%GotoAction(1) ; Minecart_WaitVert
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JSL Player_ResetState
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RTS
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.stop_east
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; Set the new direction to east and flip the cart's orientation
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LDA.b #West : STA SprSubtype, X : STA.w !MinecartDirection
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LDA #$03 : STA !SpriteDirection, X
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JMP .go_horiz
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.stop_west
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; Set the new direction to west and flip the cart's orientation
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LDA.b #East : STA SprSubtype, X : STA.w !MinecartDirection
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LDA #$02 : STA !SpriteDirection, X
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.go_horiz
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%SetTimerA($40)
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%StopCart()
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%GotoAction(0) ; Minecart_WaitHoriz
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JSL Player_ResetState
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RTS
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.stop_south
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; Set the new direction to south and flip the cart's orientation
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LDA.b #North : STA SprSubtype, X : STZ.w !MinecartDirection
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LDA #$00 : STA !SpriteDirection, X
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; -----------------------------------------------
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.go_vert
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%SetTimerA($40)
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%StopCart()
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%GotoAction(1) ; Minecart_WaitVert
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JSL Player_ResetState
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RTS
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.stop_east
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; Set the new direction to east and flip the cart's orientation
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LDA.b #West : STA SprSubtype, X : STA.w !MinecartDirection
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LDA #$03 : STA !SpriteDirection, X
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JMP .go_horiz
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.stop_west
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; Set the new direction to west and flip the cart's orientation
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LDA.b #East : STA SprSubtype, X : STA.w !MinecartDirection
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LDA #$02 : STA !SpriteDirection, X
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; -----------------------------------------------
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.go_horiz
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%SetTimerA($40)
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%StopCart()
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%GotoAction(0) ; Minecart_WaitHoriz
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JSL Player_ResetState
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RTS
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; -------------------------------------------------------
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.check_for_movement
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; Check for movement tiles
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CLC : CMP.b #$B2 : BEQ .check_direction
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CLC : CMP.b #$B3 : BEQ .check_direction
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CLC : CMP.b #$B4 : BEQ .check_direction
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CLC : CMP.b #$B5 : BEQ .check_direction
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JMP .done
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JMP .done
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; Create a composite index based on current direction and tile type
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LDA SprSubtype, X ; Load the current direction subtype (0 to 3)
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@@ -511,84 +516,73 @@ HandleTileDirections:
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LDA $0FA5 : SEC : SBC.b #$B3
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; Add the row and column offsets to index into the lookup table
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CLC : ADC.w .DirectionTileLookup, Y : TAY
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; Direction to move on tile collision
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; 00 - stop or nothing
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; 01 - north
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; 02 - east
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; 03 - south
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; 04 - west
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North = $00
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East = $01
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South = $02
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West = $03
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.DirectionTileLookup
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{
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; TL, BL, TR, BR, Stop
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db $02, $00, $04, $00 ; North
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db $00, $00, $03, $01 ; East
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db $00, $02, $00, $04 ; South
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db $03, $01, $00, $00 ; West
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}
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.check_direction
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LDA SprSubtype, X : BNE .not_zero
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.not_zero
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LDA SprSubtype, X
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ASL #2 ; Multiply by 4 (shifting left by 2 bits) to offset rows in the lookup table
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STA $07 ; Store the action index in $07
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LDA $0FA5 ; Load the tile type
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SEC : SBC.b #$B2 ; Subtract $B2 to normalize the tile type to 0 to 3
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CLC : ADC.w $07 ; Add the action index to the tile type offset to get the composite index
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TAY
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LDA.w .DirectionTileLookup, Y
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TAY
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TAY ; Transfer to Y to use as an offset for the rows
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LDA.w .DirectionTileLookup, Y : TAY
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.execute_action
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; JSR ClampSpritePositionToGrid
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CPY #$01 : BEQ .move_north
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CPY #$02 : BEQ .move_east
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CPY #$03 : BEQ .move_south
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CPY #$04 : BEQ .move_west
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JMP .done
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JMP .done
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.move_north
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LDA #$00 : STA SprSubtype, X
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STA !SpriteDirection, X
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%GotoAction(2) ; Minecart_MoveNorth
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RTS
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.move_east
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LDA #$01 : STA SprSubtype, X
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LDA #$03 : STA !SpriteDirection, X
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%GotoAction(3) ; Minecart_MoveEast
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RTS
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.move_south
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LDA #$02 : STA SprSubtype, X
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LDA #$01 : STA !SpriteDirection, X
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%GotoAction(4) ; Minecart_MoveSouth
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RTS
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.move_west
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LDA #$03 : STA SprSubtype, X
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LDA #$02 : STA !SpriteDirection, X
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%GotoAction(5) ; Minecart_MoveWest
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.done
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RTS
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.move_north
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LDA #$00 : STA SprSubtype, X
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STA !SpriteDirection, X
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%GotoAction(2) ; Minecart_MoveNorth
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RTS
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.move_east
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LDA #$01 : STA SprSubtype, X
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LDA #$03 : STA !SpriteDirection, X
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%GotoAction(3) ; Minecart_MoveEast
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RTS
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.move_south
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LDA #$02 : STA SprSubtype, X
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LDA #$01 : STA !SpriteDirection, X
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%GotoAction(4) ; Minecart_MoveSouth
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RTS
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.move_west
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LDA #$03 : STA SprSubtype, X
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LDA #$02 : STA !SpriteDirection, X
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%GotoAction(5) ; Minecart_MoveWest
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.done
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RTS
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.tile_ids
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; db $B0 ; - Horiz
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; db $B1 ; | Vert
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; TL, BL, TR, BR
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db $B2, $B3, $B4, $B5
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; db $B8 Stop North
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; db $B9 Stop South
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; db $BA Stop East
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; db $BB Stop West
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; db $BE ; + any direction
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; Direction to move on tile collision
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; 00 - stop or nothing
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; 01 - north
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; 02 - east
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; 03 - south
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; 04 - west
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.DirectionTileLookup
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{
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; TL, BL, TR, BR, Stop
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db $02, $00, $04, $00 ; North
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db $00, $00, $03, $01 ; East
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db $00, $02, $00, $04 ; South
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db $03, $01, $00, $00 ; West
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}
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.unused_tile_ids
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{
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; TL, BL, TR, BR
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db $B2, $B3, $B4, $B5
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; db $B0 - Horiz
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; db $B1 | Vert
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; db $B8 Stop North
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; db $B9 Stop South
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; db $BA Stop East
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; db $BB Stop West
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; db $BE + any direction
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}
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}
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; =========================================================
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