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scorch_src/scorchC64.asm
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Pecusx 58170eea81 Black Hole added :)
2023-10-03 10:03:53 +02:00

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; @com.wudsn.ide.asm.mainsourcefile=scorch.asm
;C64 8-bit Scorched Earth source code
;---------------------------------------------------
;by Tomasz 'pecus' Pecko and Pawel 'pirx' Kalinowski
;Warsaw 2000, 2001, 2002, 2003, 2009, 2012, 2013
;Miami & Warsaw 2022, 2023
;---------------------------------------------------
.def TARGET = 64 ; :)
;---------------------------------------------------
.def XCORRECTION_FOR_PM = 0
; if 1 - active x position of tanks correction fo PMG
.def FASTER_GRAF_PROCS = 1
; if 1 - activates faster graphics routines
; (direct writes to screen memory - C64 only :) )
;---------------------------------------------------
opt h-f+
org $801
org [a($801)],$801
basic_start(FirstSTART)
;---------------------------------------------------
.macro build
dta d"1.41" ; number of this build (4 bytes)
.endm
.macro RMTSong
lda #:1 ; do nothing in C64
.endm
;---------------------------------------------------
icl 'definitions.asm'
;---------------------------------------------------
FirstZpageVariable = $52 ; $57
.zpvar DliColorBack .byte = FirstZpageVariable
.zpvar MeteorsFlag .byte ; set 7th bit - block meteors
.zpvar MeteorsRound .byte ; set 7th bit - block meteors in round
.zpvar GradientNr .byte
.zpvar GradientColors .word
.zpvar WindChangeInRound .byte ; wind change after each turn (not round only) flag - (0 - round only, >0 - each turn)
.zpvar RandomMountains .byte ; mountains type change after each turn flag - (0 - round only, >0 - each turn)
.zpvar FastSoilDown .byte ; 0 - standard, >0 - fast
.zpvar BlackHole .byte ; 0 - no, >0 - yes
.zpvar JoystickNumber .byte
.zpvar LazyFlag .byte ; 7 bit - run Lazy Darwin, 6 bit - run Lazy Boy or Darwin (!) after inventory, 0 - nothing
.zpvar SpyHardFlag .byte ; >$7f - run SpyHard after inventory
.zpvar Vdebug .byte ; "visual debug" flag ($00 - off, $ff - on)
.zpvar xdraw .word ;= $64 ;variable X for plot
.zpvar ydraw .word ;variable Y for plot (like in Atari Basic - Y=0 in upper right corner of the screen)
.zpvar xbyte .word
.zpvar ybyte .word
.zpvar CharCode .byte
.zpvar fontind .word
.zpvar tanknr .byte
.zpvar TankSequencePointer .byte
.zpvar oldplot .word
.zpvar xc .word
.zpvar temp .word ;temporary word for the most embeded loops only
.zpvar temp2 .word ;same as above
.zpvar modify .word ;origially used to replace self-modyfying code
.zpvar tempXROLLER .word ;same as above for XROLLER routine (used also in result display routine)
.zpvar xtempDRAW .word ;same as above for XDRAW routine
.zpvar ytempDRAW .word ;same as above for XDRAW routine
.zpvar tempor2 .word
.zpvar CreditsVScrol .byte
;--------------temps used in circle routine
.zpvar xi .word ;X (word) in draw routine
.zpvar fx .byte
.zpvar yi .word ;Y (word) in draw routine
.zpvar fy .byte
.zpvar xk .word
.zpvar fs .byte
.zpvar yc .byte ;ycircle - temporary for circle
.zpvar dx .word
.zpvar dy .word
.zpvar dd .word
.zpvar di .word
.zpvar dp .word
;----------------------------
.zpvar UnderTank1 .byte
.zpvar UnderTank2 .byte
;----------------------------
.zpvar TestFlightFlag .byte ; For AI test flights ($ff - test, $00 - standard shoot flight)
.zpvar weaponPointer .word
.zpvar dliCounter .byte
.zpvar pressTimer .byte
.zpvar NTSCcounter .byte
.zpvar IsEndOfTheFallFlag .byte ; for small speedup ground falling
.zpvar sfx_effect .byte
.zpvar RMT_blocked .byte
.zpvar ScrollFlag .byte
.zpvar SkStatSimulator .byte
.zpvar FloatingAlt .byte ; floating tank altitude
.zpvar OverTankDir .byte ; (0 go right, $ff go left) direction of bypassing tanks on screen
; --------------OPTIMIZATION VARIABLES--------------
.zpvar Force .word
.zpvar Force_ .byte ; Force is 3 bytes long
.zpvar Angle .byte
.zpvar Parachute .byte ; are you insured with parachute?
.zpvar color .byte
.zpvar Erase .byte ; if 1 only mask of the character is printed
; on the graphics screen. if 0 character is printed normally
.zpvar radius .byte
.zpvar decimal .word
.zpvar NumberOfPlayers .byte ;current number of players (counted from 1)
.zpvar Counter .byte ;temporary Counter for outside loops
.zpvar ExplosionRadius .byte
.zpvar FunkyBombCounter .byte
.zpvar ResultY .byte
.zpvar xcircle .word
.zpvar ycircle .word
.zpvar vy .word
.zpvar vy_ .word ; 4 bytes
.zpvar vx .word
.zpvar vx_ .word ; 4 bytes
.zpvar HitFlag .byte ;$ff when missile hit ground, $00 when no hit, $01-$06 tank index+1 when hit tank
.zpvar PositionOnTheList .byte ; pointer position on the list being displayed
.zpvar XHit .word
.zpvar delta .word
.zpvar HowMuchToFall .byte
.zpvar magic .word
.zpvar xtraj .word
.zpvar xtraj_ .byte ; 3 bytes
.zpvar ytraj .word
.zpvar ytraj_ .byte ; 3 bytes
.zpvar Wind .word
.zpvar Wind_ .word ; 4 bytes
.zpvar RangeLeft .word
.zpvar RangeRight .word
.zpvar NewAngle .byte
.zpvar escFlag .byte ; 7 bit - Exit game, 6 bit - Exit to GameOver (cleared - exit to Menu), 0 - nothing
.zpvar LineYdraw .byte
.zpvar LineXdraw .word
.zpvar plot4x4color .byte ; $00 / $ff
.zpvar Multiplier .word
.zpvar Multiplier_ .byte ; 3 bytes
.zpvar HowToDraw .byte
.zpvar DrawDirFactor .byte
.zpvar gravity .byte
.zpvar LineLength .word
.zpvar tracerflag .byte
.zpvar isInventory .byte
.zpvar DifficultyLevel .byte
.zpvar goleft .byte
.zpvar OffsetDL1 .byte
.zpvar L1 .byte
HotNapalmFlag = FunkyBombCounter ; reuse variable!
;* RMT ZeroPage addresses in artwork/sfx/rmtplayr.a65
displayposition = modify
LineAddress4x4 = xcircle
;-----------------------------------------------
; libraries
;-----------------------------------------------
icl 'C64/lib/C64_ATARISYS.ASM'
icl 'C64/lib/C64SYS.ASM'
icl 'C64/lib/MACRO.ASM'
;-----------------------------------------------
; variable declarations in RAM (no code)
;-----------------------------------------------
; Game loading address
ORG $4100
icl 'variables.asm'
WeaponFont
ins 'artwork/weapons_AW6_mod.fnt' ; 'artwork/weapons.fnt'
;--------------------------------------------------
; Game Code
;--------------------------------------------------
FirstSTART
DL = 0
StatusBufferROM = 0
;StatusBufferCopy = 0
StatusBufferCopyEnd = 0
TRACKS = 4
DisplayCopyPurchaseEnd = 0
DisplayCopyPurchaseStart = 0
displayC64 = $2000 ; graphics screen memory start
StartAfterSplash
SEI ; disable IRQ
LDA #$36
STA $0001 ; Turn Off BASIC ROM
LDA #<NMI ;
STA $0318 ; change NMI vector
LDA #>NMI ; to our routine
STA $0319 ;
LDA #$00 ; stop Timer A
STA $DD0E ;
STA $DD04 ; set Timer A to 0, after starting
STA $DD05 ; NMI will occur immediately
LDA #$81 ;
STA $DD0D ; set Timer A as source for NMI
LDA #$01 ;
STA $DD0E ; start Timer A -> NMI
; from here on NMI is disabled
jsr MakeDarkScreen
; one time zero variables in RAM (non zero page)
lda #0
ldy #OneTimeZeroVariablesCount-1
@ sta OneTimeZeroVariables,y
dey
bpl @-
; one time zero variables in RAM (zero page)
ldy #FirstZpageVariable
@ sta $0000,y
iny
bne @-
; initialize variables in RAM (non zero page)
ldy #initialvaluesCount-1
@ lda initialvaluesStart,y
sta variablesToInitialize,y
dey
bpl @-
; generate linetables
jsr GenerateLineTable
; Random INIT
InitializeSIDrnd
;--------------------------------------------------
; Main program of the game
icl 'game.asm'
;--------------------------------------------------
.proc SetJoystickPort
rts
.endp
;--------------------------------------------------
.proc GetKey
; waits for pressing a key and returns pressed value in A
; when [ESC] is pressed, escFlag is set
; result: A=keycode
;--------------------------------------------------
jsr WaitForKeyRelease
lda #0
sta escFlag
lda #$ff
rts
.endp
;--------------------------------------------------
.proc getkeynowait
;--------------------------------------------------
jsr WaitForKeyRelease
lda kbcode
and #$3f ;CTRL and SHIFT ellimination
rts
.endp
;--------------------------------------------------
.proc WaitForKeyRelease
;--------------------------------------------------
StillWait
rts
.endp
;--------------------------------------------------
.proc IsKeyPressed
; result: A=0 - yes , A>0 - no
;--------------------------------------------------
lda #1
rts
.endp
;--------------------------------------------------
.proc DemoModeOrKey
; Waits for the key pressed if at least one human is playing.
; Otherwise, waits 3 seconds (demo mode).
;--------------------------------------------------
;check demo mode
ldx numberOfPlayers
dex
checkForHuman ; if all in skillTable other than 0 then switch to DEMO MODE
lda skillTable,x
beq peopleAreHere
dex
bpl checkForHuman
; no people, just wait a bit
;pause 150
ldy #75
jmp PauseYFrames
; rts
peopleAreHere
jmp getkey ; jsr:rts
.endp
;--------------------------------------------------
MakeDarkScreen
;--------------------------------------------------
; mva #0 dmactls ; dark screen
; and wait one frame :)
;--------------------------------------------------
.proc WaitOneFrame
;--------------------------------------------------
wait ; or waitRTC ?
rts
.endp
;--------------------------------------------------
.proc PauseYFrames
; Y - number of frames to wait (divided by 2)
; pauses for maximally 510 frames (255 * 2)
;--------------------------------------------------
@ jsr WaitOneFrame
jsr WaitOneFrame
dey
bne @-
rts
.endp
;--------------------------------------------------
.proc CheckExitKeys
;--------------------------------------------------
; Checks keyboard and sets appropriate flags for exit procedures
; If START+OPTION is pressed - exit to GameOver screen
; If 'O' key is pressed - displays "Are you sure?" and - exit to GameOver screen
; If 'Esc' key is pressed - displays "Are you sure?" and - exit to Menu screen
; Just setting the right flags!!!
rts
;
.endp
;--------------------------------------------------
.proc ShellDelay
ldy flyDelay
Y
DelayLoop
lda $d012
@ cmp $d012
beq @-
lda $d012
@ cmp $d012
beq @-
dey
bne DelayLoop
noShellDelay
rts
.endp
;--------------------------------------------------
.proc RmtSongSelect
; starting song line 0-255 to A reg
;--------------------------------------------------
rts
.endp
.proc CopyFromRom
rts
.endp
;--------------------------------------------------
icl 'C64/interrupts.asm'
;----------------------------------------------
icl 'constants.asm'
;----------------------------------------------
icl 'C64/textproc.asm'
;----------------------------------------------
icl 'grafproc.asm'
icl 'C64/gr_basics.asm'
;----------------------------------------------
icl 'weapons.asm'
;----------------------------------------------
icl 'ai.asm'
;----------------------------------------------
icl 'artwork/talk.asm'
;----------------------------------------------
TankFont
ins 'artwork/tanksv4.fnt',+0,384 ; 48 characters only
;----------------------------------------------
font4x4
ins 'artwork/font4x4s.bmp',+62
;-------------------------------------------------
.proc CheckTankCheat
ldy #$07
lda TankNr
asl
asl
asl ; 8 chars per name
tax
@
lda CheatName,y
sec
sbc tanksnames,x
cmp #$27
bne NoCheat
inx
dey
bpl @-
YesCheat
ldx TankNr
lda TanksWeaponsTableL,x
sta temp
lda TanksWeaponsTableH,x
sta temp+1
lda #99
@ iny
sta (temp),y
cpy #(number_of_weapons - 1)
bne @-
NoCheat
rts
.endp
CheatName
dta d" 008.T"+$27
;----------------------------------------------
.proc DLIinterruptBFG
pha
lda dliCounter
bne EndofBFGDLI
lda dliColorsFore
bit random
bmi @+
lda DliColorBack
@ sta COLPF2
lda dliColorsFore
bit random
bmi @+
lda DliColorBack
@ sta COLPF1
EndofBFGDLI
inc dliCounter
pla
rti
.endp
; ------------------------
.proc BFGblink
; SetDLI DLIinterruptBFG ; blinking on
ldy #50
jsr PauseYFrames
; SetDLI DLIinterruptGraph ; blinking off
rts
.endp
;----------------------------------------------
icl 'constants_top.asm'
;----------------------------------------------
NMI
INC $D020 ; change border colour, indication for a NMI
RTI ; exit interrupt
; (not acknowledged!)
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