205 lines
6.6 KiB
NASM
205 lines
6.6 KiB
NASM
;================================================================================
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; Challenge Timer
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;================================================================================
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;--------------------------------------------------------------------------------
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!FRAMES_PER_SECOND = 60
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!FRAMES_PER_MINUTE = 60*60
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!FRAMES_PER_HOUR = 60*60*60
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;--------------------------------------------------------------------------------
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macro DecIncr(value)
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LDA.l <value> : INC
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CMP.w #$000A : !BLT ?noIncr
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LDA.l <value>+2 : INC : STA.l <value>+2
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LDA.w #$0000
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?noIncr:
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STA.l <value>
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endmacro
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;--------------------------------------------------------------------------------
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macro Sub32(minuend,subtrahend,result)
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LDA.l <minuend>
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!SUB.l <subtrahend> ; perform subtraction on the LSBs
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STA.l <result>
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LDA.l <minuend>+2 ; do the same for the MSBs, with carry
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SBC.l <subtrahend>+2 ; set according to the previous result
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STA.l <result>+2
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endmacro
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;--------------------------------------------------------------------------------
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macro Blt32(value1,value2)
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LDA.l <value1>+2
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CMP.l <value2>+2
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!BLT ?done
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BNE ?done
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LDA.l <value1>
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CMP.l <value2>
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?done:
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endmacro
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;--------------------------------------------------------------------------------
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CalculateTimer:
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LDA.w #$0000
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STA.l ClockHours ; clear digit storage
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STA.l ClockHours+2
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STA.l ClockMinutes
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STA.l ClockMinutes+2
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STA.l ClockSeconds
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STA.l ClockSeconds+2
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LDA.l TimerStyle : AND.w #$00FF : CMP.w #$0002 : BNE + ; Stopwatch Mode
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%Sub32(NMIFrames,ChallengeTimer,ClockBuffer)
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BRA ++
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+ CMP.w #$0001 : BNE ++ ; Countdown Mode
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%Sub32(ChallengeTimer,NMIFrames,ClockBuffer)
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++
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%Blt32(ClockBuffer,.halfCycle) : !BGE +++ : JMP + : +++
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LDA.l TimeoutBehavior : AND.w #$00FF : BNE ++ ; DNF
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LDA.w #$0002 : STA.l ClockStatus ; Set DNF Mode
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LDA.l NMIFrames : STA.l ChallengeTimer
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LDA.l NMIFrames+2 : STA.l ChallengeTimer+2
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RTS
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++ CMP.w #$0001 : BNE ++ ; Negative Time
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LDA.l ClockBuffer : EOR.w #$FFFF : !ADD.w #$0001 : STA.l ClockBuffer
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LDA.l ClockBuffer+2 : EOR.w #$FFFF : ADC.w #$0000 : STA.l ClockBuffer+2
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LDA.w #$0001 : STA.l ClockStatus ; Set Negative Mode
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BRA .prepDigits
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++ CMP.w #$0002 : BNE ++ ; OHKO
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LDA.w #$0002 : STA.l ClockStatus ; Set DNF Mode
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LDA.l NMIFrames : STA.l ChallengeTimer
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LDA.l NMIFrames+2 : STA.l ChallengeTimer+2
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RTS
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++ CMP.w #$0004 : BNE ++ ; Drop Into Ganon
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LDA.w $048E
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BEQ .already_ganon
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LDA.w #$0002 : STA.l ClockStatus ; Set DNF Mode
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LDA.w #$0011 : STA.b GameMode
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SEP #$20
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LDA.b #$7B
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STA.w $010E
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REP #$20
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.already_ganon
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RTS
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++ ; End Game
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SEP #$30
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JSL ActivateGoal
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REP #$30
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RTS
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+
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LDA.l TimerRestart : AND.w #$00FF : BEQ +
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LDA.w #$0000 : STA.l ClockStatus ; Set Positive Mode
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+
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.prepDigits
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-
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%Blt32(ClockBuffer,.hour) : !BLT +
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%DecIncr(ClockHours)
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%Sub32(ClockBuffer,.hour,ClockBuffer) : BRA -
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+ -
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%Blt32(ClockBuffer,.minute) : !BLT +
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%DecIncr(ClockMinutes)
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%Sub32(ClockBuffer,.minute,ClockBuffer) : BRA -
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+ -
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%Blt32(ClockBuffer,.second) : !BLT +
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%DecIncr(ClockSeconds)
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%Sub32(ClockBuffer,.second,ClockBuffer) : BRA -
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+
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LDA.l ClockHours : !ADD.w #$2490 : STA.l ClockHours ; convert decimal values to tiles
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LDA.l ClockHours+2 : !ADD.w #$2490 : STA.l ClockHours+2
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LDA.l ClockMinutes : !ADD.w #$2490 : STA.l ClockMinutes
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LDA.l ClockMinutes+2 : !ADD.w #$2490 : STA.l ClockMinutes+2
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LDA.l ClockSeconds : !ADD.w #$2490 : STA.l ClockSeconds
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LDA.l ClockSeconds+2 : !ADD.w #$2490 : STA.l ClockSeconds+2
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RTS
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;--------------------------------------------------------------------------------
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.hour
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dw #$4BC0, #$0003
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.minute
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dw #$0E10, #$0000
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.second
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dw #$003C, #$0000
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.halfCycle
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dw #$FFFF, #$7FFF
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;--------------------------------------------------------------------------------
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DrawChallengeTimer:
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JSR CheckOHKO : BCC ++
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AND.w #$00FF : BEQ +
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LDA.w #$2807 : STA.l HUDTileMapBuffer+$90
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LDA.w #$280A : STA.l HUDTileMapBuffer+$92
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LDA.w #$280B : STA.l HUDTileMapBuffer+$94
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LDA.w #$280C : STA.l HUDTileMapBuffer+$96
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RTL
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+
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LDA.w #$247F : STA.l HUDTileMapBuffer+$90
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STA.l HUDTileMapBuffer+$92
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STA.l HUDTileMapBuffer+$94
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STA.l HUDTileMapBuffer+$96
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++
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LDA.l TimerStyle : BNE + : RTL : + ; Hud Timer
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LDA.w #$2807 : STA.l HUDTileMapBuffer+$92
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LDA.l ClockStatus : AND.w #$0002 : BEQ + ; DNF / OKHO
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LDA.l TimeoutBehavior : AND.w #$00FF : BNE ++ ; DNF
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LDA.w #$2808 : STA.l HUDTileMapBuffer+$94
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LDA.w #$2809 : STA.l HUDTileMapBuffer+$96
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LDA.w #$247F : STA.l HUDTileMapBuffer+$98
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STA.l HUDTileMapBuffer+$9A
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BRA +++
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++ CMP.w #$0004 : BNE ++ ; Ganon
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LDA.w #$247F : STA.l HUDTileMapBuffer+$92
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STA.l HUDTileMapBuffer+$94
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STA.l HUDTileMapBuffer+$96
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STA.l HUDTileMapBuffer+$98
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STA.l HUDTileMapBuffer+$9A
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BRA +++
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++ ; OHKO
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LDA.w #$280A : STA.l HUDTileMapBuffer+$94
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LDA.w #$280B : STA.l HUDTileMapBuffer+$96
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LDA.w #$280C : STA.l HUDTileMapBuffer+$98
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LDA.w #$247F : STA.l HUDTileMapBuffer+$9A
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+++
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STA.l HUDTileMapBuffer+$9C
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STA.l HUDTileMapBuffer+$9E
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STA.l HUDTileMapBuffer+$A0
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STA.l HUDTileMapBuffer+$A2
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STA.l HUDTileMapBuffer+$A4
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LDA.l TimerRestart : BNE +++ : RTL : +++
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BRA ++
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+ ; Show Timer
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LDA.l ClockStatus : AND.w #$0001 : !ADD.w #$2804 : STA.l HUDTileMapBuffer+$94
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LDA.l ClockHours+2 : STA.l HUDTileMapBuffer+$96
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LDA.l ClockHours : STA.l HUDTileMapBuffer+$98
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LDA.w #$2806 : STA.l HUDTileMapBuffer+$9A
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LDA.l ClockMinutes+2 : STA.l HUDTileMapBuffer+$9C
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LDA.l ClockMinutes : STA.l HUDTileMapBuffer+$9E
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LDA.w #$2806 : STA.l HUDTileMapBuffer+$A0
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LDA.l ClockSeconds+2 : STA.l HUDTileMapBuffer+$A2
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LDA.l ClockSeconds : STA.l HUDTileMapBuffer+$A4
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++
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LDA.b FrameCounter : AND.w #$001F : BNE + : JSR CalculateTimer : +
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RTL
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;--------------------------------------------------------------------------------
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OHKOTimer:
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LDA.l OHKOFlag : BNE .kill
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LDA.l ChallengeModes : AND.b #$03 : CMP.b #$01 : BEQ .kill
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LDA.l TimeoutBehavior : CMP.b #$02 : BNE +
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LDA.l ClockStatus : AND.b #$02 : BEQ +
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.kill
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LDA.b #$00 : STA.l CurrentHealth ; kill link
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+
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LDA.l CurrentHealth
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RTL
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;--------------------------------------------------------------------------------
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CheckOHKO:
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SEP #$20
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LDA.l OHKOFlag : CMP.l OHKOCached : BNE .change
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REP #$21
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RTS
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.change
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STA.l OHKOCached
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LDA.b #$01 : STA.l UpdateHUDFlag
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REP #$20
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SEC
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RTS
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;--------------------------------------------------------------------------------
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