NeptuneLander/libLuna.asm at master · OldSkoolCoder/NeptuneLander · GitHub

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;===============================================================================
; Macros/Subroutines

defm    LIBLUNA_CHECKLANDINGSITE_VVV   ; /1 = XLower (16 Bit Value)
                                       ; /2 = XUpper (16 Bit Value)
                                       ; /3 = YUpper (8 Bit Value)

                                       ; Result = Carry Set = Success,
                                       ;          Carry Clear = Dead
    lda LunaLanderXHi
    cmp #>/1
    beq @LanderFirstLoTest
    bcs @LanderHasNotLanded

@LanderFirstLoTest
    lda LunaLanderXLo
    cmp #</1
    bcs @LandingSecondTest
    jmp @LanderHasNotLanded

@LandingSecondTest
    lda LunaLanderXHi
    cmp #>/2
    beq @LanderSecondLoTest
    bcs @LanderHasNotLanded

@LanderSecondLoTest
    lda LunaLanderXLo
    cmp #</2
    bcc @LandingFirstTest
    jmp @LanderHasNotLanded

@LandingFirstTest
    lda LunaLanderY
    cmp #/3
    bcs @WeHaveLanded

@LanderHasNotLanded
    clc
    jmp @Done

@WeHaveLanded
    sec

@Done

endm

;==============================================================================

;===============================================================================
; Macros/Subroutines

defm    LIBLUNA_CHECKLANDINGSITE_AAA   ; /1 = XLower (16 Bit Address)
                                       ; /2 = XUpper (16 Bit Address)
                                       ; /3 = Y (16 Bit Address)

                                       ; Result = Carry Set = Success,
                                       ;          Carry Clear = Dead
    lda LunaLanderXHi
    cmp /1 + 1
    beq @LanderFirstLoTest
    bcs @LandingSecondTest
    bcs @LanderHasNotLanded

@LanderFirstLoTest
    lda LunaLanderXLo
    cmp /1
    bcs @LandingSecondTest
    jmp @LanderHasNotLanded

@LandingSecondTest
    lda LunaLanderXHi
    cmp /2 + 1
    beq @LanderSecondLoTest
    bcs @LanderHasNotLanded

@LanderSecondLoTest
    lda LunaLanderXLo
    cmp /2
    bcc @LandingFirstTest
    jmp @LanderHasNotLanded

@LandingFirstTest
    lda LunaLanderY
    cmp /3
    bcs @WeHaveLanded

@LanderHasNotLanded
    clc
    jmp @Done

@WeHaveLanded
    sec

@Done

endm

;;==============================================================================
;defm    LIBLUNA_DEBUGCHECKLANDINGSITE_AAA   ; /1 = XLower (16 Bit Address)
;                                       ; /2 = XUpper (16 Bit Address)
;                                       ; /3 = Y (16 Bit Address)

;                                       ; Result = Carry Set = Success,
;                                       ;          Carry Clear = Dead
;    lda #$30
;    sta $0400
;    sta $0401
;    sta $0402
;    sta $0403
;    sta $0404

;    lda LunaLanderXHi
;    cmp /1 + 1
;    beq @LanderFirstLoTest
;    bcs @LandingSecondTest
;    bcc @LanderHasNotLanded

;@LanderFirstLoTest
;    lda #$31
;    sta $0400
;    lda LunaLanderXLo
;    cmp /1
;    bcs @LandingSecondTest
;    jmp @LanderHasNotLanded

;@LandingSecondTest
;    lda #$31
;    sta $0401
;    lda LunaLanderXHi
;    cmp /2 + 1
;    beq @LanderSecondLoTest
;    bcs @LanderHasNotLanded

;@LanderSecondLoTest
;    lda #$31
;    sta $0402
;    lda LunaLanderXLo
;    cmp /2
;    bcc @LandingFirstTest
;    jmp @LanderHasNotLanded

;@LandingFirstTest
;    lda #$31
;    sta $0403
;    lda LunaLanderY
;    cmp /3
;    bcs @WeHaveLanded

;@LanderHasNotLanded
;    clc
;    jmp @Done

;@WeHaveLanded
;    lda #$31
;    sta $0404
;    sec

;@Done

;endm