first edge function

asm/edges.asm

@@ -0,0 +1,228 @@
+HorzEdge:
+    cpy #$ff : beq +
+        jsr DetectWestEdge : bra ++
+    + jsr DetectEastEdge
+    ++ cmp #$ff : beq +
+        sta $00 : asl : !add $00: tax
+        cpy #$ff : beq ++
+            jsr LoadWestData : bra .main
+        ++ jsr LoadEastData
+        .main
+        jsr LoadEdgeRoomHorz
+        sec : rts
+    + clc : rts
+
+VertEdge:
+    cpy #$ff : beq +
+        jsr DetectNorthEdge : bra ++
+    + jsr DetectSouthEdge
+    ++ cmp #$ff : beq +
+        sta $00 : asl : !add $00 : tax
+        cpy #$ff : beq ++
+            jsr LoadNorthData : bra .main
+        ++ jsr LoadSouthData
+        .main
+        ; todo: work to do
+        sec : rts
+    + clc : rts
+
+; todo: LoadVert
+; todo: FixAdjustTrans
+; todo: Fix ab fe swap in normal
+
+LoadEdgeRoomHorz:
+    lda $03 : sta $a0
+    sty $09
+    and.b #$0f : asl a : !sub $23 : !add $09 : sta $02
+    ldy #$00 : jsr ShiftVariablesMainDir
+    lda $a0 : and.b #$F0 : lsr #3 : sta $0603 : inc : sta $0607
+
+
+    lda $04 : and #$40 : bne +
+        lda $603 : sta $00 : stz $01 : bra ++
+    +   lda $607 : sta $00 : lda #$02 : sta $01
+    ++
+    lda $00 : sta $21 : sta $0601 : sta $0605
+    lda $01 : sta $aa : lsr : sta $01 : stz $00
+
+    stz $0e
+    rep #$30
+    lda $e8 : sta $02
+    lda $06 : and #$00ff : !add $00 : sta $00
+
+    cmp #$006c : !bge +
+        lda #$0077 : bra ++
+    + cmp #$017c : !blt +
+        lda #$0187 : bra ++
+    + !add #$000b
+    ++ sta $0618 : inc #2 : sta $061a
+
+    lda $00 : cmp #$0078 : !bge +
+        lda #$0000 : bra ++
+    + cmp #$0178 : !blt +
+        lda #$0100 : bra ++
+    + !sub #$0078
+    ++ sta $00
+
+    ; figures out scroll amt
+    cmp $02 : bne +
+        lda #$0000 : bra .done
+    + !blt +
+        !sub $02 : bra .done
+    + lda $02 : !sub $00 : inc $0e
+
+    .done sta $ab : sep #$30
+    lda $0e : asl : ora $ac : sta $ac
+    lda $0601 : sta $e9
+
+    lda $04 : and #$80 : lsr #4 : sta $ee ; layer stuff
+    rts
+
+
+LoadNorthData:
+    lda NorthEdgeInfo x, sta $06
+    lda NorthEdgeInfo x+1, sta $07
+    lda NorthEdgeInfo x+2, sta $08
+    lda NorthOpenEdge x, sta $03
+    lda NorthOpenEdge x+1, sta $04
+    lda NorthOpenEdge x+2, sta $05
+    rts
+
+LoadSouthData:
+    lda SouthEdgeInfo x, sta $06
+    lda SouthEdgeInfo x+1, sta $07
+    lda SouthEdgeInfo x+2, sta $08
+    lda SouthOpenEdge x, sta $03
+    lda SouthOpenEdge x+1, sta $04
+    lda SouthOpenEdge x+2, sta $05
+    rts
+
+LoadWestData:
+    lda WestEdgeInfo x, sta $06
+    lda WestEdgeInfo x+1, sta $07
+    lda WestEdgeInfo x+2, sta $08
+    lda WestOpenEdge x, sta $03
+    lda WestOpenEdge x+1, sta $04
+    lda WestOpenEdge x+2, sta $05
+    rts
+
+LoadEastData:
+    lda EastEdgeInfo x, sta $06
+    lda EastEdgeInfo x+1, sta $07
+    lda EastEdgeInfo x+2, sta $08
+    lda EastOpenEdge x, sta $03
+    lda EastOpenEdge x+1, sta $04
+    lda EastOpenEdge x+2, sta $05
+    rts
+
+
+DetectNorthEdge:
+    ldx #$ff
+    lda $a2
+    cmp #$82 : bne +
+        lda $22 : cmp #$50 : bcs ++
+            ldx #$01 : bra .end
+        ++ ldx #$00 : bra .end
+    + cmp #$83 : bne +
+        ldx #$02 : bra .end
+    + cmp #$84 : bne +
+        lda $a9 : beq ++
+            lda $22 : cmp #$78 : bcs +++
+                ldx #$04 : bra .end
+            +++ ldx #$05 : bra .end
+        ++ lda $22 : cmp #$78 : bcs ++
+            ldx #$03 : bra .end
+        ++ ldx #$04 : bra .end
+    + cmp #$85 : bne +
+        ldx #$06 : bra .end
+    + cmp #$db : bne +
+        lda $a9 : beq ++
+            lda $22 : beq ++
+                ldx #$08 : bra .end
+        ++ ldx #$07 : bra .end
+    + cmp #$dc : bne .end
+        lda $a9 : bne ++
+            lda $22 : bcs #$b0 : bcs ++
+                ldx #$09 : bra .end
+        ++ ldx #$0a
+    .end txa : rts
+
+DetectSouthEdge:
+    ldx #$ff
+    lda $a2
+    cmp #$72 : bne +
+        lda $22 : cmp #$50 : bcs ++
+            ldx #$01 : bra .end
+        ++ ldx #$00 : bra .end
+    + cmp #$73 : bne +
+        ldx #$02 : bra .end
+    + cmp #$74 : bne +
+        lda $a9 : beq ++
+            lda $22 : cmp #$78 : bcs +++
+                ldx #$04 : bra .end
+            +++ ldx #$05 : bra .end
+        ++ lda $22 : cmp #$78 : bcs ++
+            ldx #$03 : bra .end
+        ++ ldx #$04 : bra .end
+    + cmp #$75 : bne +
+        ldx #$06 : bra .end
+    + cmp #$cb : bne +
+        lda $a9 : beq ++
+            lda $22 : beq ++
+                ldx #$08 : bra .end
+        ++ ldx #$07 : bra .end
+    + cmp #$cc : bne .end
+        lda $a9 : bne ++
+            lda $22 : bcs #$b0 : bcs ++
+                ldx #$09 : bra .end
+        ++ ldx #$0a
+    .end txa : rts
+
+DetectWestEdge:
+    ldx #$ff
+    lda $a2
+    cmp #$65 : bne +
+        ldx #$00 : bra .end
+    + cmp #$74 : bne +
+        ldx #$01 : bra .end
+    + cmp #$75 : bne +
+        ldx #$02 : bra .end
+    + cmp #$82 : bne +
+        lda $aa : beq ++
+           ldx #$03 : bra .end
+        ++ ldx #$04 : bra .end
+    + cmp #$85 : bne +
+            ldx #$05 : bra .end
+    + cmp #$cc : bne +
+        lda $aa : beq ++
+            ldx #$07 : bra .end
+        ++ ldx #$06 : bra .end
+    + cmp #$dc : bne .end
+        ldx #$08
+    .end txa : rts
+
+DetectEastEdge:
+    ldx #$ff
+    lda $a2
+    cmp #$64 : bne +
+        ldx #$00 : bra .end
+    + cmp #$73 : bne +
+        ldx #$01 : bra .end
+    + cmp #$74 : bne +
+        ldx #$02 : bra .end
+    + cmp #$81 : bne +
+        lda $aa : beq ++
+           ldx #$04 : bra .end
+        ++ ldx #$03 : bra .end
+    + cmp #$84 : bne +
+        ldx #$05 : bra .end
+    + cmp #$cb : bne +
+        lda $aa : beq ++
+            ldx #$07 : bra .end
+        ++ ldx #$06 : bra .end
+    + cmp #$db : bne .end
+        ldx #$08
+    .end txa : rts
+
+
+