mirror of
https://github.com/Pecusx/scorch_src.git
synced 2026-05-21 14:49:40 +02:00
Pecusx
2689 lines
57 KiB
NASM
2689 lines
57 KiB
NASM
; @com.wudsn.ide.asm.mainsourcefile=scorch.asm
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.IF *>0 ;this is a trick that prevents compiling this file alone
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;--------------------------------------------------
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.proc Explosion
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;--------------------------------------------------
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;cleanup of the soil fall down ranges (left and right)
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mwa #screenwidth RangeLeft
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lda #0
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sta RangeRight
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sta RangeRight+1
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ldx TankNr
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lda ActiveWeapon,x
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.endp
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.proc ExplosionDirect
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asl
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tax
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lda ExplosionRoutines+1,x
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pha
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lda ExplosionRoutines,x
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pha
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rts
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ExplosionRoutines
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.word babymissile-1
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.word missile-1
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.word babynuke-1
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.word nuke-1
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.word leapfrog-1
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.word funkybomb-1
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.word mirv-1
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.word deathshead-1
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.word napalm-1 ;napalm
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.word hotnapalm-1 ;hotnapalm
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.word tracer-1
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.word tracer-1 ;smoketracer
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.word babyroller-1
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.word roller-1
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.word heavyroller-1
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.word riotcharge-1
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.word riotblast-1
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.word riotbomb-1
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.word heavyriotbomb-1
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.word babydigger-1
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.word digger-1
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.word heavydigger-1
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.word babysandhog-1
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.word sandhog-1
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.word heavysandhog-1
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.word dirtclod-1
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.word dirtball-1
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.word tonofdirt-1
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.word liquiddirt-1
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.word dirtcharge-1
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.word VOID-1 ;earthdisrupter
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.word VOID-1 ;plasmablast
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.word laser-1
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VOID
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tracer
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rts
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.endp
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; ------------------------
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; ------------------------
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.proc babymissile
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mva #sfx_baby_missile sfx_effect
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inc FallDown2
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mva #11 ExplosionRadius
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jsr CalculateExplosionRange
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jmp xmissile
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.endp
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; ------------------------
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.proc missile ;
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mva #sfx_baby_missile sfx_effect
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inc FallDown2
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mva #17 ExplosionRadius
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jsr CalculateExplosionRange
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jmp xmissile
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.endp
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; ------------------------
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.proc babynuke
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mva #sfx_nuke sfx_effect
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inc FallDown2
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mva #25 ExplosionRadius
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jsr CalculateExplosionRange
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jmp xmissile
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.endp
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; ------------------------
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.proc nuke
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mva #sfx_nuke sfx_effect
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inc FallDown2
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mva #31 ExplosionRadius
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jsr CalculateExplosionRange
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jmp xmissile
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.endp
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; ------------------------
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.proc leapfrog
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mva #sfx_baby_missile sfx_effect
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inc FallDown2
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mva #17 ExplosionRadius
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jsr CalculateExplosionRange
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jsr xmissile
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; soil must fall down now! there is no other way...
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; hide tanks or they fall down with soil
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lda TankNr
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pha
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mva #1 Erase
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jsr drawtanks
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mva #0 Erase
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jsr SoilDown2
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jsr drawtanks
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pla
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sta TankNr
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; it looks like force is divided by 4 here BUT"
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; in Flight routine force is multiplied by 2 and left
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; so, we have Force divided by 2 here (not accurately)
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lsr Force+1
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ror Force
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;lsr Force+1
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;ror Force
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mva LeapFrogAngle Angle
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mva #sfx_funky_hit sfx_effect
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sbw ytraj+1 #$05 ; next missiles start point goes 5 pixel UP to prevent multiple explosion at one point if tank is hit (4 pixels tank height + 1)
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jsr Flight
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lda HitFlag
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beq EndOfLeapping
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mva #15 ExplosionRadius
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jsr CalculateExplosionRange0
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mva #sfx_baby_missile sfx_effect
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jsr xmissile
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; soil must fall down now! there is no other way...
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; hide tanks or they fall down with soil
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lda TankNr
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pha
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mva #1 Erase
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jsr drawtanks
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mva #0 Erase
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jsr SoilDown2
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jsr drawtanks
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pla
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sta TankNr
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; it looks like force is divided by 4 here BUT"
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; in Flight routine force is multiplied by 2 and left
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; so, we have Force divided by 2 here (not accurately)
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;lsr Force+1
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;ror Force
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lsr Force+1
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ror Force
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mva LeapFrogAngle Angle
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mva #sfx_funky_hit sfx_effect
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sbw ytraj+1 #$05 ; next missiles start point goes 5 pixel UP to prevent multiple explosion at one point if tank is hit (4 pixels tank height + 1)
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jsr Flight
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lda HitFlag
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beq EndOfLeapping
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mva #13 ExplosionRadius
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jsr CalculateExplosionRange0
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mva #sfx_baby_missile sfx_effect
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jmp xmissile
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EndOfLeapping
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rts
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.endp
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; ------------------------
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.proc mirv ; the whole mirv is performed by Flight routine
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inc FallDown2
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rts
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.endp
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; ------------------------
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.proc funkybomb ;
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mva #sfx_baby_missile sfx_effect
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mwa xtraj+1 xtrajfb
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sbw ytraj+1 #$05 ytrajfb ; funky missiles start point goes 5 pixel UP to prevent multiple explosion at one point if tank is hit (4 pixels tank height + 1)
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inc FallDown2
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;central Explosion
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mva #21 ExplosionRadius
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jsr CalculateExplosionRange0
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jsr xmissile
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lda TankNr
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pha
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mva #1 Erase
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jsr drawtanks
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mva #0 Erase
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jsr SoilDown2
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;
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mva #1 Erase
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jsr drawtanks
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mva #0 Erase
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pla
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sta TankNr
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mva #5 FunkyBombCounter
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FunkyBombLoop
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mva #1 tracerflag
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;force randomization (range: 256-511)
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lda random
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sta Force
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mva #1 Force+1
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;Angle randomization Range: (70-110 degrees)
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randomize 70 110
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sta Angle
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lda #0
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sta xtraj
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sta ytraj
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mwa xtrajfb xtraj+1
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mwa ytrajfb ytraj+1
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mva #sfx_funky_hit sfx_effect
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jsr Flight
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jsr CalculateExplosionRange
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lda HitFlag
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beq NoExplosionInFunkyBomb
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mva #sfx_baby_missile sfx_effect
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mva #11 ExplosionRadius
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jsr xmissile
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NoExplosionInFunkyBomb
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dec FunkyBombCounter
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bne FunkyBombLoop
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mva #0 tracerflag
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rts
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.endp
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; ------------------------
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.proc deathshead
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inc FallDown2
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mva #31 ExplosionRadius
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jsr CalculateExplosionRange
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mva #sfx_nuke sfx_effect
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SaveDrawXY
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jsr xmissile
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UnSaveDrawXY
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sbw xdraw #35
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jsr CalculateExplosionRange
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mva #sfx_nuke sfx_effect
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SaveDrawXY
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jsr xmissile
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UnSaveDrawXY
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adw xdraw #70
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jsr CalculateExplosionRange
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mva #sfx_nuke sfx_effect
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SaveDrawXY
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jsr xmissile
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UnSaveDrawXY
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sbw xdraw #35
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;
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sbw ydraw #35
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;jsr CalculateExplosionRange
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cpw ydraw #screenHeight
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bcs NoUpperCircle
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mva #sfx_nuke sfx_effect
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SaveDrawXY
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jsr xmissile
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UnSaveDrawXY
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NoUpperCircle
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adw ydraw #70
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;jsr CalculateExplosionRange
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cpw ydraw #screenHeight
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bcs NoLowerCircle
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mva #sfx_nuke sfx_effect
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SaveDrawXY
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jsr xmissile
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UnSaveDrawXY
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NoLowerCircle
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mva #sfx_silencer sfx_effect
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rts
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.endp
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.proc SaveDrawXY
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mwa xdraw tempXROLLER
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mwa ydraw modify
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rts
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.endp
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.proc UnSaveDrawXY
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mwa tempXROLLER xdraw
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mwa modify ydraw
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rts
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.endp
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; ------------------------
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.proc napalm
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jmp xnapalm
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.endp
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; ------------------------
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.proc hotnapalm
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jmp xnapalm
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.endp
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; ------------------------
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.proc xnapalm
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mwa xdraw xcircle ; store hitpoint for future repeats
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ldy #30 ; repeat 30 times
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sty magic
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RepeatNapalm ; external loop (for fire animation)
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mwa xcircle xdraw
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sbw xdraw #(1*8) ; 8 characters on left side hit point
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ldy #0
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sty magic+1
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RepeatFlame ; internal loop (draw flames)
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ldy #0
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adw xdraw #mountaintable temp
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sty ydraw+1
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lda (temp),y
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sta ydraw
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sbw xdraw #4
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; draw flame symbol
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lda magic ; if last repeat - clear flames
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beq LastNapalmRepeat
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lda random
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and #%00000110
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clc
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adc #$46
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bne PutFlameChar
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LastNapalmRepeat
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lda #$4e ; clear flame symbol
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PutFlameChar
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sta CharCode
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jsr TypeChar
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adw xdraw #4
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adw xdraw #1 ; next char 1 pixels to right
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inc magic+1
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lda magic+1
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cmp #17 ; 8 chars on left, 8 chars on right and 1 in center
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bne RepeatFlame
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dec magic
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bpl RepeatNapalm
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rts
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.endp
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; ------------------------
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.proc babyroller
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inc FallDown2
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mva #11 ExplosionRadius
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jmp xroller
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.endp
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; ------------------------
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.proc roller ;
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inc FallDown2
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mva #21 ExplosionRadius
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jmp xroller
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.endp
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; ------------------------
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.proc heavyroller
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inc FallDown2
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mva #31 ExplosionRadius
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jmp xroller
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.endp
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; ------------------------
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.proc riotbomb
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inc FallDown2
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mva #17 ExplosionRadius
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jsr CalculateExplosionRange
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jmp xriotbomb
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.endp
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; ------------------------
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.proc heavyriotbomb
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inc FallDown2
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mva #29 ExplosionRadius
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jsr CalculateExplosionRange
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jmp xriotbomb
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.endp
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; ------------------------
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.proc babydigger
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mva #sfx_digger sfx_effect
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mva #0 sandhogflag
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inc FallDown2
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mva #13 DigLong
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mva #1 diggery ; how many branches (-1)
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jmp xdigger
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.endp
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; ------------------------
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.proc digger ;
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mva #sfx_digger sfx_effect
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mva #0 sandhogflag
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inc FallDown2
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mva #13 DigLong
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mva #3 diggery ; how many branches (-1)
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jmp xdigger
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.endp
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; ------------------------
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.proc heavydigger
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mva #sfx_digger sfx_effect
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mva #0 sandhogflag
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inc FallDown2
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mva #13 DigLong
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mva #7 diggery ; how many branches (-1)
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jmp xdigger
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.endp
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; ------------------------
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.proc xdigger
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mwa xdraw digstartx
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mwa ydraw digstarty
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ldx diggery
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WriteToBranches
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lda xdraw
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sta digtabxL,x
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lda xdraw+1
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sta digtabxH,x
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lda ydraw
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sta digtabyL,x
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lda ydraw+1
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sta digtabyH,x
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dex
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bpl WriteToBranches
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jsr DiggerCharacter ; start character
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adw xdraw #4
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lda DigLong
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; looks strange, but it is (DigLong+2)*4
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clc
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adc #$2
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asl
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asl
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sta ExplosionRadius
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jsr CalculateExplosionRange
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BranchNotFinished
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ldx diggery
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CalculateBranches
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txa
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and #$01
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bne DigRight
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diglewy ; even branches go left
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sec
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lda digtabxL,x
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sbc #$04
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sta digtabxL,x
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lda digtabxH,x
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sbc #$00
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sta digtabxH,x
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jmp DigRandomize
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DigRight ; odd go right (everytime 4 pixels)
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clc
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lda digtabxL,x
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adc #$04
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sta digtabxL,x
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lda digtabxH,x
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adc #$00
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sta digtabxH,x
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DigRandomize
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lda random
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and #$87
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bmi DigUp
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DigDown
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and #$07
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clc
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adc digtabyL,x
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sta digtabyL,x
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lda digtabyH,x
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adc #$00
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sta digtabyH,x
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;crashing bug here - if too much added to digtaby, it gets over screenheight and starts writing over random areas
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;WARNING! fix for 1 byte screenheight. TODO
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lda digtabyL,x
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cmp #screenheight
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bcc @+ ; branch if less
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lda #screenheight-1
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sta digtabyL,x
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@ jmp DigCalculateNext
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DigUp
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and #$07
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sta temp
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sec
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lda digtabyL,x
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sbc temp
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sta digtabyL,x
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lda digtabyH,x
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sbc #$00
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sta digtabyH,x
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DigCalculateNext
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dex
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bpl CalculateBranches
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; here we draw...
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ldx diggery
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DigDrawing
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lda digtabxL,x
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sta xdraw
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lda digtabxH,x
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sta xdraw+1
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lda digtabyL,x
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sta ydraw
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lda digtabyH,x
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sta ydraw+1
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phx
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jsr DiggerCharacter
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plx
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dex
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bpl DigDrawing
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dec:lda DigLong
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jpl BranchNotFinished
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DoNotPutDig
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mva #sfx_silencer sfx_effect
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rts
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DiggerCharacter
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lda random
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and #$06
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clc
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adc #$36
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adc sandhogflag
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sta CharCode
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cpw xdraw #(screenwidth-6)
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bcs DoNotPutDig
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jmp TypeChar
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.endp
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; ------------------------
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.proc babysandhog
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mva #sfx_sandhog sfx_effect
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mva #8 sandhogflag
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inc FallDown2
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mva #13 DigLong
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mva #1 diggery ; how many branches (-1)
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jmp xdigger
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.endp
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; ------------------------
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.proc sandhog
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mva #sfx_sandhog sfx_effect
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mva #8 sandhogflag
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inc FallDown2
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mva #13 DigLong
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mva #3 diggery ; how many branches (-1)
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jmp xdigger
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.endp
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; ------------------------
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.proc heavysandhog
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mva #sfx_sandhog sfx_effect
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mva #8 sandhogflag
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inc FallDown2
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mva #13 DigLong
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mva #5 diggery ; how many branches (-1)
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jmp xdigger
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.endp
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; ------------------------
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.proc dirtclod
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inc FallDown2
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mva #12 ExplosionRadius
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jsr CalculateExplosionRange
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jmp xdirt
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.endp
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; ------------------------
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.proc dirtball
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inc FallDown2
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mva #22 ExplosionRadius
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jsr CalculateExplosionRange
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jmp xdirt
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.endp
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; ------------------------
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.proc tonofdirt
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inc FallDown2
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mva #31 ExplosionRadius
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jsr CalculateExplosionRange
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jmp xdirt
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.endp
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; ------------------------
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.proc dirtcharge
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inc FallDown2
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mva #61 ExplosionRadius
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jsr CalculateExplosionRange
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jmp ofdirt
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.endp
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; ------------------------
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.proc riotcharge
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mva #sfx_riot_blast sfx_effect
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inc FallDown2
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mva #31 ExplosionRadius
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jsr CalculateExplosionRange
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jmp cleanDirt
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.endp
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; ------------------------
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.proc riotblast
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mva #sfx_riot_blast sfx_effect
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inc FallDown2
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mva #61 ExplosionRadius
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jsr CalculateExplosionRange
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jmp cleanDirt
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.endp
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; ------------------------
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.proc liquiddirt
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mva #sfx_liquid_dirt sfx_effect
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mwa #254 FillCounter
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jmp xliquiddirt
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.endp
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; ------------------------
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.proc laser
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; but where are xdraw and ydraw ???? !!!!
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; ------------------------
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ldx TankNr
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lda AngleTable,x
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tay
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clc
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lda xtankstableL,x
|
|
adc EndOfTheBarrelX,y ; correction of the end of the barrel point (X)
|
|
sta xbyte
|
|
lda xtankstableH,x
|
|
adc #0
|
|
sta xbyte+1
|
|
sec
|
|
lda ytankstable,x
|
|
sbc EndOfTheBarrelY,y ; correction of the end of the barrel point (Y)
|
|
sta ybyte
|
|
lda #$00
|
|
sbc #$00
|
|
sta ybyte+1
|
|
|
|
mva #0 drawFunction
|
|
|
|
mwa xdraw LaserCoordinate
|
|
mwa ydraw LaserCoordinate+2
|
|
mwa xbyte LaserCoordinate+4
|
|
mwa ybyte LaserCoordinate+6
|
|
|
|
mva #sfx_lightning sfx_effect
|
|
mva #51 yc ; laser blink counter
|
|
@
|
|
lda yc
|
|
and #$01
|
|
sta color
|
|
mwa LaserCoordinate xdraw
|
|
mwa LaserCoordinate+2 ydraw
|
|
mwa LaserCoordinate+4 xbyte
|
|
mwa LaserCoordinate+6 ybyte
|
|
mva #sfx_lightning sfx_effect
|
|
jsr draw
|
|
|
|
dec:lda yc
|
|
bpl @-
|
|
|
|
mva #1 color
|
|
mwa LaserCoordinate xdraw
|
|
mwa LaserCoordinate+2 ydraw
|
|
jsr plot
|
|
mva #0 HitFlag
|
|
jsr CheckCollisionWithTank
|
|
lda HitFlag
|
|
beq LaserMisses
|
|
; here we hit a tank (X)
|
|
ldy #100
|
|
jsr DecreaseEnergyX
|
|
LaserMisses
|
|
rts
|
|
.endp
|
|
; -----------------
|
|
.proc xmissile ;
|
|
; -----------------
|
|
lda #1
|
|
sta radius
|
|
sta color
|
|
ExplosionLoop
|
|
jsr circle
|
|
:2 inc radius
|
|
lda radius
|
|
cmp ExplosionRadius
|
|
bcc ExplosionLoop
|
|
|
|
ldx #0
|
|
stx color
|
|
inx
|
|
stx radius
|
|
ExplosionLoop2
|
|
jsr circle
|
|
inc radius
|
|
lda radius
|
|
cmp ExplosionRadius
|
|
bcc ExplosionLoop2
|
|
|
|
mva #1 color
|
|
|
|
;check tanks' distance from the centre of the explosion
|
|
|
|
mva #%10000000 drawFunction
|
|
;the above switches Draw to measuring length
|
|
;trick is easy - how many pixels does it take to draw
|
|
;a line from one point to another
|
|
;it must be somehow easier than regular Pitagoras
|
|
;calculation
|
|
|
|
ldx NumberOfPlayers
|
|
DistanceCheckLoop
|
|
dex
|
|
lda eXistenZ,x
|
|
beq EndOfDistanceCheckLoop
|
|
;here the tank exist
|
|
lda XtankstableL,x
|
|
clc
|
|
adc #3 ;measure from middle of the tank
|
|
sta xbyte
|
|
lda XtankstableH,x
|
|
clc
|
|
adc #0 ;measure from middle of the tank
|
|
sta xbyte+1
|
|
lda Ytankstable,x
|
|
sec
|
|
sbc #2 ;measure from middle of the tank
|
|
sta ybyte
|
|
lda #0
|
|
sta ybyte+1
|
|
phx
|
|
jsr draw
|
|
plx
|
|
;if tank within range of the explosion?
|
|
lda LineLength+1
|
|
bne TankIsNotWithinTheRange
|
|
lda LineLength
|
|
cmp ExplosionRadius
|
|
bcs TankIsNotWithinTheRange
|
|
lda ExplosionRadius
|
|
sec
|
|
sbc LineLength
|
|
;multiply difference by 8
|
|
clc
|
|
adc #1
|
|
:3 asl
|
|
tay
|
|
; check shields
|
|
lda ActiveDefenceWeapon,x
|
|
cmp #ind_Shield_________ ; one hit shield
|
|
beq UseShield
|
|
cmp #ind_Force_Shield___ ; shield with energy and parachute
|
|
beq UseShieldWithEnergy
|
|
cmp #ind_Heavy_Shield___ ; shield with energy
|
|
beq UseShieldWithEnergy
|
|
cmp #ind_Auto_Defense___ ; Auto Defence (it works only if hit ground next to tank. Tank hit is handled in Flight proc)
|
|
beq UseShieldWithEnergy
|
|
cmp #ind_Mag_Deflector__ ; Mag deflector (it works only if hit ground next to tank. Tank hit is handled in Flight proc)
|
|
beq UseShieldWithEnergy
|
|
jsr DecreaseEnergyX
|
|
jmp EndOfDistanceCheckLoop
|
|
UseShieldWithEnergy
|
|
jsr DecreaseShieldEnergyX
|
|
cpy #0 ; is necessary to reduce tenk energy ?
|
|
beq ShieldCoveredTank
|
|
jsr DecreaseEnergyX
|
|
ShieldCoveredTank
|
|
lda ShieldEnergy,x
|
|
jne EndOfDistanceCheckLoop
|
|
ShieldEnergy0 ; deactivate if no energy. it's like use one hit shield :)
|
|
UseShield
|
|
mva #1 Erase
|
|
phx
|
|
jsr DrawTankShield
|
|
plx
|
|
mva #0 ActiveDefenceWeapon,x ; deactivate defense weapons
|
|
TankIsNotWithinTheRange
|
|
EndOfDistanceCheckLoop
|
|
txa
|
|
jne DistanceCheckLoop
|
|
mva #sfx_silencer sfx_effect
|
|
rts
|
|
.endp
|
|
; -----------------
|
|
.proc xdirt ;
|
|
; -----------------
|
|
mva #sfx_dirt_charge sfx_effect
|
|
lda #1
|
|
sta radius
|
|
sta color
|
|
dirtLoop
|
|
jsr circle
|
|
inw ydraw
|
|
jsr circle
|
|
.nowarn dew ydraw
|
|
inc radius
|
|
lda radius
|
|
cmp ExplosionRadius
|
|
bne dirtLoop
|
|
rts
|
|
.endp
|
|
; -----------------
|
|
.proc xriotbomb ;
|
|
; -----------------
|
|
mva #sfx_riot_blast sfx_effect
|
|
lda #0
|
|
sta radius
|
|
sta color
|
|
rbombLoop
|
|
jsr circle
|
|
inc radius
|
|
lda radius
|
|
cmp ExplosionRadius
|
|
bne rbombLoop
|
|
mva #1 color
|
|
rts
|
|
.endp
|
|
; ----------------
|
|
.proc xroller ;
|
|
; now collisions are detected with modified draw routine
|
|
; therefore YDRAW value must be taken from mountaintable
|
|
jsr checkRollDirection
|
|
; HowMuchToFall - direction
|
|
; $FF - we are in a hole (flying in missile direction)
|
|
; 1 - right, 2 - left
|
|
Rollin
|
|
mva #sfx_shield_off sfx_effect
|
|
adw xdraw #mountaintable tempXROLLER
|
|
ldy #0
|
|
lda (tempXROLLER),y
|
|
sta HeightRol ; relative point
|
|
|
|
RollinContinues
|
|
wait
|
|
wait
|
|
; new point is set
|
|
adw xdraw #mountaintable tempXROLLER
|
|
ldy #0
|
|
lda (tempXROLLER),y
|
|
sta ydraw
|
|
sty ydraw+1
|
|
beq ExplodeNow
|
|
cmp HeightRol
|
|
beq UpNotYet
|
|
bcc ExplodeNow
|
|
UpNotYet
|
|
sec ;clc
|
|
sta HeightRol
|
|
sbc #1
|
|
sta ydraw
|
|
;check tank collision prior to PLOT
|
|
sty HitFlag ; set to 0
|
|
|
|
jsr CheckCollisionWithTank
|
|
|
|
lda HitFlag
|
|
bne ExplodeNow
|
|
jsr unPlot
|
|
; let's go the right direction
|
|
lda HowMuchToFall
|
|
cmp #1
|
|
beq HowMuchToFallRight2
|
|
.nowarn dew xdraw
|
|
lda xdraw
|
|
jne RollinContinues ; like cpw xdraw #0
|
|
lda xdraw+1
|
|
jne RollinContinues
|
|
beq ExplodeNow
|
|
HowMuchToFallRight2
|
|
inw xdraw
|
|
cpw xdraw #screenwidth
|
|
jne RollinContinues
|
|
ExplodeNow
|
|
mwa xdraw xcircle ; we must store somewhere (BAD)
|
|
mwa ydraw ycircle ; xdraw and ydraw (BAD)
|
|
mwa #0 xdraw
|
|
mwa #screenheight-1 ydraw
|
|
jsr unPlot
|
|
mwa xcircle xdraw ;(bad)
|
|
mwa ycircle ydraw ;(bad)
|
|
|
|
; finally a little explosion
|
|
jsr CalculateExplosionRange
|
|
mva #sfx_baby_missile sfx_effect
|
|
jmp xmissile
|
|
rts
|
|
.endp
|
|
; --------------------------------------------------
|
|
.proc checkRollDirection
|
|
; check rolling direction (for roller and other rolling weapons)
|
|
ldy #0
|
|
mwa #mountaintable tempXROLLER
|
|
|
|
adw tempXROLLER xdraw
|
|
lda (tempXROLLER),y
|
|
sta ydraw
|
|
sty ydraw+1
|
|
|
|
lda vx+3
|
|
; if horizontal velocity is negative then change the direction
|
|
bpl PositiveVelocity
|
|
lda goleft
|
|
ora #$01
|
|
sta goleft
|
|
PositiveVelocity
|
|
; first we look for the left slope
|
|
; then righ slope and set the flag
|
|
; $FF - we are in a hole (flying in missile direction)
|
|
; 1 - right, 2 - left
|
|
mva #$ff HowMuchToFall
|
|
mva ydraw HeightRol
|
|
;mwa #mountaintable tempXROLLER - It's already done !!!
|
|
;adw tempXROLLER xdraw
|
|
SeekLeft
|
|
cpw tempXROLLER #mountaintable
|
|
beq GoRightNow ; "bounce" if we have on left end
|
|
.nowarn dew tempXROLLER
|
|
lda (tempXROLLER),y ;fukk! beware of Y value
|
|
cmp HeightRol
|
|
bne HowMuchToFallLeft
|
|
HowMuchToFallLeft
|
|
bcs GoRightNow
|
|
mva #1 HowMuchToFall
|
|
GoRightNow
|
|
mwa #mountaintable tempXROLLER
|
|
adw tempXROLLER xdraw
|
|
SeekRight
|
|
cpw tempXROLLER #(mountaintable+screenwidth)
|
|
beq HowMuchToFallKnown ; "stop" if we have on left end
|
|
inw tempXROLLER
|
|
lda (tempXROLLER),y
|
|
cmp HeightRol
|
|
bne HowMuchToFallRight
|
|
HowMuchToFallRight
|
|
; check if up or down
|
|
bcs HowMuchToFallKnown
|
|
lda HowMuchToFall
|
|
bpl ItIsLeftAlready
|
|
mva #2 HowMuchToFall
|
|
bne HowMuchToFallKnown
|
|
ItIsLeftAlready
|
|
mva #$ff HowMuchToFall
|
|
HowMuchToFallKnown
|
|
lda HowMuchToFall
|
|
bpl DirectionChecked
|
|
lda #1
|
|
clc
|
|
adc goleft
|
|
sta HowMuchToFall
|
|
DirectionChecked
|
|
rts
|
|
.endp
|
|
|
|
; --------------------------------------------------
|
|
.proc cleanDirt
|
|
mva #0 color
|
|
jmp ofdirt.NoColor
|
|
.endp
|
|
; --------------------------------------------------
|
|
.proc ofdirt ;
|
|
; --------------------------------------------------
|
|
; makes dirt on xdraw,ydraw position and of ExplosionRadius height
|
|
mva #sfx_dirt_chrg_s sfx_effect
|
|
|
|
mva #1 color
|
|
NoColor ; jump here with color=0 to clean dirt
|
|
mwa xdraw xcircle
|
|
mwa ydraw ycircle
|
|
lda #1
|
|
; current dirt width
|
|
sta magic
|
|
NextRow
|
|
wait
|
|
ldy magic
|
|
NextLine
|
|
lda random
|
|
and #$01
|
|
beq DoNotPlot
|
|
sty magic+1
|
|
jsr plot
|
|
ldy magic+1
|
|
DoNotPlot
|
|
inw xdraw
|
|
dey
|
|
bne NextLine
|
|
dec ydraw ; 1 line up
|
|
lda ydraw
|
|
cmp #$ff
|
|
beq EndOfTheDirt ;if horizontal Counter wraps
|
|
inc magic ; width+2
|
|
inc magic
|
|
lda magic
|
|
sta magic+1 ; just for a second
|
|
lsr magic+1
|
|
sec
|
|
lda xcircle
|
|
sbc magic+1
|
|
sta xdraw
|
|
lda xcircle+1
|
|
sbc #0
|
|
sta xdraw+1 ; new starting coordinate in a given row
|
|
dec ExplosionRadius
|
|
bne NextRow
|
|
EndOfTheDirt
|
|
mwa xcircle xdraw
|
|
mwa ycircle ydraw
|
|
rts
|
|
.endp
|
|
; ----------------
|
|
.proc xliquiddirt ;
|
|
mwa xdraw TempXfill
|
|
RepeatFill
|
|
mwa TempXfill xdraw
|
|
jsr checkRollDirection
|
|
; HowMuchToFall - direction
|
|
; $FF - we are in a hole (flying in missile direction)
|
|
; 1 - right, 2 - left
|
|
adw xdraw #mountaintable tempXROLLER
|
|
ldy #0
|
|
lda (tempXROLLER),y
|
|
sta HeightRol ; relative point
|
|
|
|
RollinContinuesLiquid
|
|
; new point is set
|
|
adw xdraw #mountaintable tempXROLLER
|
|
ldy #0
|
|
lda (tempXROLLER),y
|
|
sta ydraw
|
|
cmp HeightRol
|
|
beq UpNotYet2
|
|
bcc FillNow
|
|
UpNotYet2
|
|
sec ;clc
|
|
sta HeightRol
|
|
sbc #1
|
|
sta ydraw
|
|
lda HowMuchToFall
|
|
cmp #1
|
|
beq HowMuchToFallRight3
|
|
.NOWARN dew xdraw
|
|
cpw xdraw #$ffff
|
|
jne RollinContinuesLiquid
|
|
beq FillNow
|
|
HowMuchToFallRight3
|
|
inw xdraw
|
|
cpw xdraw #(screenwidth+1)
|
|
jne RollinContinuesLiquid
|
|
FillNow
|
|
; finally one pixel more
|
|
ldy #0
|
|
lda HowMuchToFall
|
|
bmi FillHole
|
|
cmp#1
|
|
beq FillLeft
|
|
inw xdraw
|
|
inw xdraw ; tricky but we must rollback xdraw in proper direction
|
|
FillLeft
|
|
.nowarn dew xdraw
|
|
FillHole
|
|
adw xdraw #mountaintable tempXROLLER
|
|
lda (tempXROLLER),y
|
|
sta ydraw
|
|
beq ToHighFill ; if we filled all playfield (very rare but possible)
|
|
dec ydraw ; one pixel up
|
|
ToHighFill
|
|
lda ydraw
|
|
sta (tempXROLLER),y ;mountaintable update
|
|
mva #1 color
|
|
jsr plot.MakePlot
|
|
.nowarn dew FillCounter
|
|
cpw FillCounter #0
|
|
jne RepeatFill
|
|
rts
|
|
.endp
|
|
|
|
;--------------------------------------------------
|
|
.proc BeforeFire ;TankNr (byte)
|
|
;--------------------------------------------------
|
|
;this nice routine makes the whole shooting
|
|
;preparation: aiming and displaying
|
|
;angle and shooting force values
|
|
;
|
|
|
|
;first, get current parameters (angle+force)
|
|
;for an active tank and display them
|
|
;(these values are taken from the previous round)
|
|
|
|
ldx TankNr
|
|
|
|
;Checking the maximal force
|
|
lda MaxForceTableH,x
|
|
cmp ForceTableH,x
|
|
bne ContinueToCheckMaxForce2
|
|
lda MaxForceTableL,x
|
|
cmp ForceTableL,x
|
|
ContinueToCheckMaxForce2
|
|
bcs @+
|
|
lda MaxForceTableH,x
|
|
sta ForceTableH,x
|
|
lda MaxForceTableL,x
|
|
sta ForceTableL,x
|
|
@
|
|
jsr DisplayStatus ;all digital values like force, angle, wind, etc.
|
|
jsr PutTankNameOnScreen
|
|
|
|
jsr DrawTankNr
|
|
|
|
wait ; best after drawing a tank
|
|
|
|
|
|
;keyboard reading
|
|
; KBCODE keeps code of last keybi
|
|
; SKSTAT $ff - nothing pressed
|
|
; $FB - any key
|
|
; $f7 - shift
|
|
; $f3 - shift+key
|
|
|
|
notpressed
|
|
lda SKSTAT
|
|
cmp #$ff
|
|
jeq checkJoy
|
|
cmp #$f7 ; SHIFT
|
|
jeq checkJoy
|
|
|
|
lda kbcode
|
|
and #%10111111 ; SHIFT elimination
|
|
|
|
cmp #28 ; ESC
|
|
bne @+
|
|
jsr AreYouSure
|
|
lda escFlag
|
|
beq notpressed
|
|
;---esc pressed-quit game---
|
|
rts
|
|
|
|
@
|
|
cmp #$0d ; I
|
|
bne @+
|
|
callInventory
|
|
; Hide all tanks - after inventory they may have other shapes
|
|
mva #1 Erase
|
|
jsr DrawTanks
|
|
mva #0 Erase
|
|
;
|
|
mva #$ff isInventory
|
|
jsr Purchase
|
|
mva #0 escFlag
|
|
jsr DisplayStatus
|
|
jsr SetMainScreen
|
|
jsr DrawTanks
|
|
jsr WaitForKeyRelease
|
|
jmp BeforeFire
|
|
@
|
|
cmp #$8e
|
|
jeq CTRLPressedUp
|
|
cmp #$8f
|
|
jeq CTRLPressedDown
|
|
cmp #$ac
|
|
jeq CTRLPressedTAB
|
|
|
|
and #$3f ;CTRL and SHIFT ellimination
|
|
jumpFromStick
|
|
cmp #$e
|
|
jeq pressedUp
|
|
cmp #$f
|
|
jeq pressedDown
|
|
cmp #$6
|
|
jeq pressedLeft
|
|
cmp #$7
|
|
jeq pressedRight
|
|
cmp #$21
|
|
jeq pressedSpace
|
|
cmp #$2c
|
|
jeq pressedTAB
|
|
cmp #$25 ; M
|
|
jeq pressedM
|
|
cmp #$3e ; S
|
|
jeq pressedS
|
|
jmp notpressed
|
|
checkJoy
|
|
;------------JOY-------------
|
|
;happy happy joy joy
|
|
;check for joystick now
|
|
lda JSTICK0
|
|
and #$0f
|
|
cmp #$0f
|
|
beq notpressedJoy
|
|
tay
|
|
lda joyToKeyTable,y
|
|
jmp jumpFromStick
|
|
notpressedJoy
|
|
;fire
|
|
lda TRIG0S
|
|
jeq pressedSpace
|
|
mva #$ff pressTimer ; stop counting frames
|
|
jmp notpressed
|
|
|
|
;
|
|
pressedUp
|
|
lda pressTimer
|
|
spl:mva #0 pressTimer ; if >128 then reset to 0
|
|
cmp #25 ; 1/2s
|
|
bcs CTRLPressedUp
|
|
|
|
|
|
;force increaseeee!
|
|
ldx TankNr
|
|
inc ForceTableL,x
|
|
bne CheckingMaxForce
|
|
inc ForceTableH,x
|
|
CheckingMaxForce
|
|
|
|
mva #sfx_set_power_1 sfx_effect
|
|
|
|
lda MaxForceTableH,x
|
|
cmp ForceTableH,x
|
|
bne FurtherCheckMaxForce
|
|
lda MaxForceTableL,x
|
|
cmp ForceTableL,x
|
|
FurtherCheckMaxForce
|
|
jcs BeforeFire
|
|
|
|
lda MaxForceTableH,x
|
|
sta ForceTableH,x
|
|
lda MaxForceTableL,x
|
|
sta ForceTableL,x
|
|
|
|
jmp BeforeFire
|
|
|
|
CTRLPressedUp
|
|
ldx TankNr
|
|
lda ForceTableL,x
|
|
clc
|
|
adc #10
|
|
sta ForceTableL,x
|
|
bcc CheckingMaxForce
|
|
inc ForceTableH,x
|
|
jmp CheckingMaxForce
|
|
|
|
|
|
pressedDown
|
|
lda pressTimer
|
|
spl:mva #0 pressTimer ; if >128 then reset to 0
|
|
cmp #25 ; 1/2s
|
|
bcs CTRLPressedDown
|
|
|
|
mva #sfx_set_power_1 sfx_effect
|
|
|
|
ldx TankNr
|
|
dec ForceTableL,x
|
|
lda ForceTableL,x
|
|
cmp #$ff
|
|
bne @+
|
|
dec ForceTableH,x
|
|
bpl @+
|
|
ForceGoesZero
|
|
lda #0
|
|
sta ForceTableH,x
|
|
sta ForceTableL,x
|
|
@
|
|
jmp BeforeFire
|
|
|
|
CTRLPressedDown
|
|
mva #sfx_set_power_1 sfx_effect
|
|
|
|
ldx TankNr
|
|
sec
|
|
lda ForceTableL,x
|
|
sbc #10
|
|
sta ForceTableL,x
|
|
jcs BeforeFire
|
|
dec ForceTableH,x
|
|
bmi ForceGoesZero
|
|
jmp BeforeFire
|
|
|
|
pressedRight
|
|
mva #sfx_set_power_2 sfx_effect
|
|
ldx TankNr
|
|
dec AngleTable,x
|
|
lda AngleTable,x
|
|
;cmp #180 ; if angle goes through 180 we clear the barrel
|
|
;bne NotThrough90DegreesLeft
|
|
;mva #$2e CharCode ; TODO: change
|
|
;jsr DrawTankNr.drawtankNrX
|
|
;NotThrough90DegreesLeft
|
|
cmp #255 ; -1
|
|
jne BeforeFire
|
|
lda #180
|
|
sta AngleTable,x
|
|
jmp BeforeFire
|
|
|
|
pressedLeft
|
|
mva #sfx_set_power_2 sfx_effect
|
|
ldx TankNr
|
|
INC AngleTable,x
|
|
lda AngleTable,x
|
|
;bne NotThrough90DegreesRight
|
|
;mva #$30 CharCode ; if angle goes through 0 we clear the barrel
|
|
;jsr DrawTankNr.drawtankNrX
|
|
;NotThrough90DegreesRight
|
|
cmp #181
|
|
jne BeforeFire
|
|
lda #0
|
|
sta AngleTable,x
|
|
jmp BeforeFire
|
|
|
|
pressedTAB
|
|
mva #sfx_purchase sfx_effect
|
|
ldx TankNr
|
|
inc ActiveWeapon,x
|
|
lda ActiveWeapon,x
|
|
cmp #$30 ; number of offensive weapons
|
|
bne @+
|
|
lda #0
|
|
sta ActiveWeapon,x
|
|
@
|
|
lda ActiveWeapon,x
|
|
jsr HowManyBullets ; and we have qty of owned shells. Ufff....
|
|
beq pressedTAB
|
|
jsr WaitForKeyRelease
|
|
jmp BeforeFire
|
|
|
|
CTRLpressedTAB
|
|
ldx TankNr
|
|
dec ActiveWeapon,x
|
|
bpl @+
|
|
lda #$2f ; the last possible offensive weapon
|
|
sta ActiveWeapon,x
|
|
@
|
|
lda ActiveWeapon,x
|
|
jsr HowManyBullets ; and we have qty of owned shells. Ufff....
|
|
beq CTRLpressedTAB
|
|
jsr WaitForKeyRelease
|
|
jmp BeforeFire
|
|
|
|
pressedM
|
|
; have you tried turning the music off and on again?
|
|
lda #$ff
|
|
eor:sta noMusic
|
|
lda #song_ingame
|
|
jsr RmtSongSelect
|
|
jsr WaitForKeyRelease
|
|
jmp BeforeFire
|
|
|
|
pressedS
|
|
; have you tried turning sfx off and on again?
|
|
lda #$ff
|
|
eor:sta noSfx
|
|
jsr WaitForKeyRelease
|
|
jmp BeforeFire
|
|
|
|
|
|
pressedSpace
|
|
;=================================
|
|
;we shoot here!!!
|
|
mva #0 pressTimer ; reset
|
|
jsr WaitForKeyRelease
|
|
lda pressTimer
|
|
cmp #25 ; 1/2s
|
|
bcc fire
|
|
jmp callInventory
|
|
fire
|
|
RTS
|
|
.endp
|
|
|
|
;--------------------------------------------------
|
|
.proc Shoot ;TankNr (byte)
|
|
;--------------------------------------------------
|
|
;it looks like this routine is too big -
|
|
;- more and more functions were being added...
|
|
;good idea would be to rewrite it completely
|
|
;with much more separate blocks, but you know -
|
|
;- do not touch it if it works...
|
|
|
|
;the latest addition to this routine is
|
|
;displaying offensive texts!
|
|
|
|
RandomizeOffensiveText
|
|
lda random
|
|
cmp #talk.NumberOfOffensiveTexts
|
|
bcs RandomizeOffensiveText
|
|
|
|
sta TextNumberOff
|
|
ldy TankNr
|
|
mva #1 plot4x4color
|
|
jsr DisplayOffensiveTextNr
|
|
|
|
|
|
ldx TankNr
|
|
lda ActiveWeapon,x
|
|
cmp #ind_Laser__________ ; laser
|
|
bne NotStrongShoot
|
|
mva #0 color
|
|
lda #7
|
|
sta Force
|
|
sta Force+1
|
|
bne AfterStrongShoot
|
|
NotStrongShoot
|
|
lda ForceTableL,x
|
|
sta Force
|
|
lda ForceTableH,x
|
|
sta Force+1
|
|
AfterStrongShoot
|
|
lda #$0
|
|
sta Force+2
|
|
lda AngleTable,x
|
|
sta Angle
|
|
|
|
lda #0
|
|
sta xtraj
|
|
sta ytraj
|
|
|
|
mva #sfx_shoot sfx_effect
|
|
; Shoots tank nr X !!! :)
|
|
; set the starting coordinates of bullet with correction
|
|
; to start where the tank's barrel ends
|
|
; (without it bullet would go from the left lower corner of the tank)
|
|
;ldx TankNr
|
|
ldy Angle
|
|
clc
|
|
lda xtankstableL,x
|
|
adc EndOfTheBarrelX,y ; correction of X
|
|
sta xtraj+1
|
|
lda xtankstableH,x
|
|
adc #$00
|
|
sta xtraj+2
|
|
sec
|
|
lda ytankstable,x
|
|
sbc EndOfTheBarrelY,y ; correction of Y
|
|
sta ytraj+1
|
|
lda #$00
|
|
sbc #$00
|
|
sta ytraj+2
|
|
|
|
; checking if the shot is underground (no Flight but Hit :) )
|
|
ldy #0
|
|
adw xtraj+1 #mountaintable temp
|
|
lda ytraj+1
|
|
cmp (temp),y ; check collision witch mountains
|
|
bcs ShotUnderGround
|
|
jsr Flight
|
|
mva #1 color
|
|
rts
|
|
ShotUnderGround
|
|
mwa xtraj+1 xdraw ; but why not XHit and YHit !!!???
|
|
mwa ytraj+1 ydraw
|
|
mva #$ff HitFlag
|
|
rts
|
|
.endp
|
|
|
|
;--------------------------------------------------
|
|
.proc TankFalls;
|
|
;--------------------------------------------------
|
|
lda #0
|
|
sta PreviousFall ; bit 7 - left, bit 6 - right
|
|
sta EndOfTheFallFlag
|
|
sta Parachute
|
|
mva #2 FallingSoundBit ; another trick for only one sfx initialization in loop
|
|
|
|
; let's check if the given tank has got the parachute
|
|
ldx TankNr
|
|
lda ActiveDefenceWeapon,x
|
|
cmp #ind_Parachute______ ; parachute
|
|
beq ParachuteActive
|
|
cmp #ind_StrongParachute ; strong parachute
|
|
beq ParachuteActive
|
|
cmp #ind_Force_Shield___ ; shield witch energy and parachute
|
|
bne TankFallsX
|
|
ParachuteActive
|
|
inc Parachute
|
|
TankFallsX
|
|
; sound only if really falls
|
|
lda Parachute
|
|
and FallingSoundBit ; bit 1
|
|
beq NoFallingSound
|
|
mva #0 FallingSoundBit
|
|
mva #sfx_shield_off sfx_effect
|
|
NoFallingSound
|
|
; clear previous position
|
|
mva #1 Erase
|
|
jsr DrawTankNr
|
|
; and the parachute (if present)
|
|
lda Parachute
|
|
and #01
|
|
beq DoNotClearParachute
|
|
; here we clear the parachute
|
|
ldx TankNr
|
|
jsr DrawTankParachute
|
|
DoNotClearParachute
|
|
mva #0 Erase
|
|
ldx TankNr
|
|
lda EndOfTheFallFlag ; We only get byte below the tank if still falling
|
|
bne NoGroundCheck
|
|
; coordinates of the first pixel under the tank
|
|
ldx TankNr
|
|
lda XtankstableL,x
|
|
sta xdraw
|
|
lda XtankstableH,x
|
|
sta xdraw+1
|
|
lda Ytankstable,x
|
|
clc
|
|
adc #1 ; in this point the comment helped us! For the very first
|
|
; time in our lives! Tada! It opens a new chapter!!!
|
|
sta ydraw
|
|
;
|
|
; UnderTank1 ; byte under tank
|
|
; UnderTank2 ; byte under tank reversed (for simple check right direction)
|
|
lda #08
|
|
sta temp ; Loop Counter
|
|
ByteBelowTank
|
|
jsr point
|
|
beq EmptyPoint2
|
|
sec
|
|
ror UnderTank2
|
|
sec
|
|
bcs ROLPoint2
|
|
EmptyPoint2
|
|
clc
|
|
ror UnderTank2
|
|
clc
|
|
ROLPoint2
|
|
rol UnderTank1
|
|
inw xdraw
|
|
dec temp
|
|
bne ByteBelowTank
|
|
NoGroundCheck
|
|
ldx TankNr
|
|
lda UnderTank1
|
|
bne NoFallingDown
|
|
; Tank falling down ----
|
|
lda Parachute
|
|
and #1
|
|
bne ParachutePresent
|
|
; decreasing energy
|
|
ldy #2 ; how much energy to substract
|
|
jsr DecreaseEnergyX
|
|
ParachutePresent
|
|
; check parachute type
|
|
lda ActiveDefenceWeapon,x
|
|
cmp #ind_StrongParachute ; strong parachute
|
|
bne OneTimeParachute
|
|
; decreasing energy of parachute
|
|
ldy #2 ; how much energy to substract
|
|
jsr DecreaseShieldEnergyX
|
|
cpy #0 ; is necessary to reduce tenk energy ?
|
|
beq @+
|
|
jsr DecreaseEnergyX
|
|
@
|
|
; check energy of parachute
|
|
lda ShieldEnergy,x
|
|
bne OneTimeParachute
|
|
mva #0 Parachute
|
|
mva #0 ActiveDefenceWeapon,x ; deactivate defence
|
|
OneTimeParachute
|
|
lda Parachute
|
|
ora #2 ; we set bit nr 1 (nr 0 means that parachute is present)
|
|
sta Parachute
|
|
; tank is falling down - modify coorinates
|
|
lda Ytankstable,x
|
|
clc
|
|
adc #1
|
|
sta Ytankstable,x
|
|
jmp EndOfFCycle
|
|
NoFallingDown
|
|
; check direction (left or right)
|
|
ldy #7 ; SlideLeftTable length -1 (from 0 to 7)
|
|
@ lda SlideLeftTable,y
|
|
cmp UnderTank1
|
|
beq FallingRight
|
|
cmp UnderTank2
|
|
beq FallingLeft
|
|
dey
|
|
bpl @-
|
|
bmi NoLeftOrRight
|
|
FallingLeft
|
|
; tank is falling left
|
|
bit PreviousFall ; bit 6 - right
|
|
bvs EndLeftFall
|
|
; we finish falling left if the tank reached the edge of the screen
|
|
lda XtanksTableL,x
|
|
bne NotLeftEdge
|
|
lda XtanksTableH,x
|
|
beq EndLeftFall
|
|
NotLeftEdge
|
|
; tank is falling left - modify coorinates
|
|
clc
|
|
lda XtankstableL,x
|
|
adc #1
|
|
sta XtankstableL,x
|
|
lda XtankstableH,x
|
|
adc #0
|
|
sta XtankstableH,x
|
|
mva #%10000000 PreviousFall ; set bit 7 - left
|
|
bne EndOfFCycle
|
|
FallingRight
|
|
; tank is falling right
|
|
bit PreviousFall ; bit 7 - left
|
|
bmi EndRightFall
|
|
; we finish falling right if the tank reached the edge of the screen
|
|
clc
|
|
lda XtanksTableL,x
|
|
adc #$08 ; we'll check right side of the char
|
|
sta temp
|
|
lda XtanksTableH,x
|
|
adc #0
|
|
sta temp+1
|
|
cpw temp #screenwidth
|
|
beq EndRightFall
|
|
; tank is falling right - modify coorinates
|
|
sec
|
|
lda XtankstableL,x
|
|
sbc #1
|
|
sta XtankstableL,x
|
|
lda XtankstableH,x
|
|
sbc #0
|
|
sta XtankstableH,x
|
|
mva #%01000000 PreviousFall ; set bit 6 - right
|
|
bne EndOfFCycle
|
|
EndLeftFall
|
|
EndRightFall
|
|
NoLeftOrRight
|
|
inc EndOfTheFallFlag ; after this is shouldn't fall
|
|
EndOfFCycle
|
|
; draw tank on new position
|
|
jsr DrawTankNr ; ew have TankNr in X (I hope :) )
|
|
; checking is parachute present and if so, draw it
|
|
lda Parachute
|
|
cmp #3 ; parachute and falling
|
|
bne DoNotDrawParachute
|
|
; here we draw parachute
|
|
ldx TankNr
|
|
jsr DrawTankParachute
|
|
wait ; onli if tank with patachute
|
|
RapidFalling
|
|
DoNotDrawParachute
|
|
lda EndOfTheFallFlag
|
|
jeq TankFallsX
|
|
; Tank falling down already finished, but it is not sure that
|
|
; the horizontal coordinate is even.
|
|
; If it is odd then it must be corrected because otherwise
|
|
; P/M graphics background would not look OK
|
|
ldx TankNr
|
|
lda XtanksTableL,x
|
|
and #$01
|
|
beq EndOfFall ; if it is even then it is the end
|
|
; and if not, we push it one pixel the way it was falling before
|
|
lda #%10000000 ; set "virtual ground" for right falling
|
|
ldy #%00000001
|
|
bit PreviousFall
|
|
bmi ForceFallLeft
|
|
tay ; tricky - replaces ldy #%10000000
|
|
lda #%00000001 ; set "virtual ground" for left falling
|
|
ForceFallLeft
|
|
sta UnderTank1
|
|
sty UnderTank2
|
|
jne TankFallsX
|
|
EndOfFall
|
|
mva #1 Erase
|
|
ldx TankNr
|
|
; if tank was falling down having parachute,
|
|
; we must deduct one parachute
|
|
lda Parachute
|
|
cmp #$03 ; was falling down and the parachute
|
|
bne NoParachuteWeapon
|
|
; first we check type of parachute
|
|
lda ActiveDefenceWeapon,x
|
|
cmp #ind_Parachute______ ; deactivate weapon only if parachute (54)
|
|
bne NoParachuteWeapon
|
|
mva #0 ActiveDefenceWeapon,x ; deactivate defence weapon (parachute)
|
|
NoParachuteWeapon
|
|
; now we clear parachute on the screen if present
|
|
lda Parachute
|
|
and #01
|
|
beq ThereWasNoParachute
|
|
jsr DrawTankParachute
|
|
ThereWasNoParachute
|
|
mva #0 Erase
|
|
ldx TankNr
|
|
jsr DrawTankNr ; redraw tank after erase parachute (exactly for redraw leaky schield :) )
|
|
mva #sfx_silencer sfx_effect
|
|
rts
|
|
|
|
.endp
|
|
|
|
;--------------------------------------------------
|
|
.proc DrawTankParachute
|
|
;Tank number in X
|
|
;--------------------------------------------------
|
|
lda #$34 ; parachute symbol
|
|
sta CharCode
|
|
lda Ytankstable,x
|
|
sec
|
|
sbc #8
|
|
sta ydraw
|
|
lda XtanksTableL,x
|
|
sta xdraw
|
|
lda XtanksTableH,x
|
|
sta xdraw+1
|
|
jsr TypeChar
|
|
rts
|
|
.endp
|
|
;--------------------------------------------------
|
|
.proc Flight ; Force(byte.byte), Wind(0.word)
|
|
; Angle(byte) 128=0, 255=maxright, 0=maxleft
|
|
;--------------------------------------------------
|
|
;g=-0.1
|
|
;vx=Force*cos(Angle)
|
|
;vy=Force*sin(Angle)
|
|
;
|
|
;:begin
|
|
;ytraj=ytray-vy
|
|
;vy=vy-g
|
|
;xtraj=xtraj+vx - without Wind
|
|
;vx=vx+Wind (Wind is a small fraction)
|
|
;plot xtraj,ytraj - there is clearing in plot
|
|
;goto begin
|
|
|
|
|
|
|
|
|
|
; smoke tracer :)
|
|
ldy #0
|
|
ldx TankNr
|
|
lda ActiveWeapon,x
|
|
cmp #11 ; Smoke tracer
|
|
bne noSmokeTracer
|
|
iny
|
|
noSmokeTracer
|
|
sty SmokeTracerFlag
|
|
|
|
RepeatIfSmokeTracer
|
|
RepeatFlight
|
|
mwa ytraj+1 Ytrajold+1
|
|
mwa xtraj+1 Xtrajold+1
|
|
mva #%01000000 drawFunction
|
|
|
|
lda #0
|
|
sta vx
|
|
sta vx+1
|
|
sta vx+2
|
|
sta HitFlag
|
|
sta xdraw
|
|
sta xdraw+1
|
|
sta ydraw
|
|
sta ydraw+1
|
|
|
|
;vx calculation
|
|
;vx = sin(90-Angle) for Angle <=90
|
|
;vx = -sin(Angle-90) for 90 < Angle <= 180
|
|
aslw Force ;Force = Force * 2
|
|
|
|
;cos(Angle) (but we use sin table only so some shenanigans happen)
|
|
ldx Angle
|
|
stx LeapFrogAngle ; we will need it later
|
|
|
|
;Angle works like this:
|
|
;0 'degrees' is horizontally right
|
|
;90 'degrees' is straight up
|
|
;180 horizontally left
|
|
|
|
; (we have to set goleft used in rolling weapons)
|
|
|
|
cpx #91
|
|
bcc angleUnder90
|
|
|
|
;over 90
|
|
mva #1 goleft
|
|
sec
|
|
txa ; lda # Angle
|
|
sbc #90
|
|
tax
|
|
jmp @+
|
|
|
|
angleUnder90
|
|
mva #0 goleft
|
|
sec ; X = 90-Angle
|
|
lda #90
|
|
sbc Angle
|
|
tax
|
|
@
|
|
lda sintable,x ; cos(X)
|
|
sta Multiplee ; *Force
|
|
mwa Force Multiplier
|
|
lda #$0
|
|
sta Multiplier+2
|
|
ldx #8
|
|
MultiplyLoop
|
|
ror Multiplee
|
|
bcc DoNotAdd
|
|
clc
|
|
lda Multiplier
|
|
adc vx
|
|
sta vx
|
|
lda Multiplier+1
|
|
adc vx+1
|
|
sta vx+1
|
|
lda Multiplier+2
|
|
adc vx+2
|
|
sta vx+2
|
|
DoNotAdd
|
|
;clc ;carry always cleared here (anyway we hope so :)
|
|
rol Multiplier
|
|
rol Multiplier+1
|
|
rol Multiplier+2
|
|
dex
|
|
bne MultiplyLoop
|
|
|
|
mva #0 vx+3
|
|
; here in vx there is a number
|
|
; xxxx.xx00 = sin(Angle)*Force
|
|
; negate it if going left
|
|
lda goleft
|
|
beq @+
|
|
.rept 4
|
|
lda #$00
|
|
sbc vx+#
|
|
sta vx+#
|
|
.endr
|
|
@
|
|
;======vy
|
|
;vy = sin(Angle) for Angle <=90
|
|
;vy = sin(180-Angle) for 90 < Angle <= 180
|
|
|
|
lda #0
|
|
sta vy
|
|
sta vy+1
|
|
sta vy+2
|
|
;--
|
|
ldx Angle
|
|
cpx #91
|
|
bcc YangleUnder90
|
|
|
|
lda #180
|
|
sec
|
|
sbc Angle
|
|
tax
|
|
|
|
YangleUnder90
|
|
lda sintable,x
|
|
|
|
sta Multiplee ;sin(Angle)*Force
|
|
mwa Force Multiplier
|
|
lda #$0
|
|
sta Multiplier+2
|
|
ldx #8
|
|
MultiplyLoopY
|
|
ror Multiplee
|
|
bcc DoNotAddY
|
|
clc
|
|
lda Multiplier
|
|
adc vy
|
|
sta vy
|
|
lda Multiplier+1
|
|
adc vy+1
|
|
sta vy+1
|
|
lda Multiplier+2
|
|
adc vy+2
|
|
sta vy+2
|
|
DoNotAddY
|
|
;clc ;carry always cleared here (anyway we hope so :)
|
|
rol Multiplier
|
|
rol Multiplier+1
|
|
rol Multiplier+2
|
|
dex
|
|
bne MultiplyLoopY
|
|
; here in vy there is a number
|
|
; yyyy.yy=cos(Angle)*Force
|
|
|
|
mva #0 vy+3 ;vy=cos(Angle)*Force
|
|
|
|
Loopi
|
|
;ytraj=ytraj-vy (skipping least significant byte of vy)
|
|
sec
|
|
lda ytraj
|
|
sbc vy+1
|
|
sta ytraj
|
|
lda ytraj+1
|
|
sbc vy+2
|
|
sta ytraj+1
|
|
lda ytraj+2
|
|
sbc vy+3
|
|
sta ytraj+2
|
|
|
|
;vy=vy-g (again without least significant byte of vy)
|
|
sec
|
|
lda vy+1
|
|
sbc gravity
|
|
sta vy+1
|
|
lda vy+2
|
|
sbc #0
|
|
sta vy+2
|
|
lda vy+3
|
|
sbc #0
|
|
sta vy+3
|
|
bpl StillUp
|
|
; where we know that the bullet starts to fall down
|
|
; we check if it is MIRV and if so, jump to MIRV routine
|
|
ldx TankNr
|
|
lda ActiveWeapon,x
|
|
cmp #ind_MIRV___________ ; MIRV
|
|
jeq MIRVdownLoop
|
|
StillUp
|
|
|
|
|
|
clc ;xtraj=xtraj+vx (skipping least significant byte of vx)
|
|
lda xtraj ;here of course Fight to right
|
|
adc vx+1
|
|
sta xtraj
|
|
lda xtraj+1
|
|
adc vx+2
|
|
sta xtraj+1
|
|
lda xtraj+2
|
|
adc vx+3
|
|
sta xtraj+2
|
|
|
|
clc
|
|
.rept 4
|
|
lda vx+#
|
|
adc Wind+#
|
|
sta vx+#
|
|
.endr
|
|
mwa xtrajold+1 xdraw
|
|
mwa ytrajold+1 ydraw
|
|
mwa xtraj+1 xbyte
|
|
mwa ytraj+1 ybyte
|
|
jsr draw
|
|
;key
|
|
mwa xtraj+1 XtrajOld+1
|
|
mwa ytraj+1 YtrajOld+1
|
|
|
|
lda tracerflag
|
|
bne nowait
|
|
lda color
|
|
beq nowait
|
|
|
|
jsr shellDelay
|
|
|
|
nowait
|
|
lda HitFlag
|
|
bne Hit
|
|
|
|
cpw ytraj+1 #screenheight+1
|
|
bcc YTrayLowerThanScreenHeight
|
|
lda ytraj+2
|
|
bpl EndOfFlight
|
|
|
|
YTrayLowerThanScreenHeight ; it means it is still on screen and not above
|
|
|
|
SkipCollisionCheck
|
|
|
|
mwa xtraj+1 xdraw
|
|
mwa ytraj+1 ydraw
|
|
|
|
lda tracerflag
|
|
bne NoUnPlot
|
|
|
|
jsr UnPlot
|
|
|
|
NoUnPlot
|
|
|
|
jmp Loopi
|
|
|
|
Hit
|
|
mwa XHit xdraw
|
|
mwa YHit ydraw
|
|
|
|
jsr unPlot
|
|
EndOfFlight
|
|
mwa xdraw xcircle ; we must store for a little while
|
|
mwa ydraw ycircle ; xdraw and ydraw .... but this values are in YHit and XHit !!!
|
|
mwa #0 xdraw
|
|
mwa #screenheight-1 ydraw
|
|
jsr unPlot
|
|
mwa xcircle xdraw
|
|
mwa ycircle ydraw
|
|
|
|
ldy SmokeTracerFlag
|
|
beq EndOfFlight2
|
|
dey
|
|
sty SmokeTracerFlag
|
|
jmp SecondFlight
|
|
EndOfFlight2
|
|
mva #0 tracerflag ; don't know why
|
|
|
|
; and now check for defensive-aggressive weapon
|
|
lda HitFlag
|
|
jeq NoHitAtEndOfFight ; RTS only !!!
|
|
jmi NoTankHitAtEndOfFight
|
|
; tank hit - check defensive weapon of this tank
|
|
tax
|
|
dex ; index of tank in X
|
|
lda ActiveDefenceWeapon,x
|
|
cmp #ind_Auto_Defense___ ; Auto Defence
|
|
beq AutoDefence
|
|
cmp #ind_Mag_Deflector__ ; Mag Deflector
|
|
bne NoDefence
|
|
MagDeflector
|
|
; now run defensive-aggressive weapon - Mag Deflector!
|
|
; get tank position
|
|
clc
|
|
lda xtankstableL,x
|
|
adc #$04 ; almost in tak center :)
|
|
sta XHit
|
|
lda xtankstableH,x
|
|
adc #$00
|
|
sta XHit+1
|
|
lda #$ff ; change to ground hit (we hope)
|
|
sta HitFlag
|
|
bit random ; left or right deflection ?
|
|
bpl RightDeflection
|
|
LeftDeflection
|
|
sbw XHit #18 ; 18 pixels to right and explode...
|
|
bit XHit+1 ; if off-screen ...
|
|
bpl EndOfMagDeflector ; hit of course but we need RTS
|
|
adw XHit #36 ; change to right :)
|
|
jmp EndOfMagDeflector
|
|
RightDeflection
|
|
adw XHit #18 ; 18 pixels to right and explode...
|
|
cpw XHit screenwidth ; if off-screen ...
|
|
bcs EndOfMagDeflector ; hit of course but we need RTS
|
|
sbw XHit #36 ; change to left
|
|
EndOfMagDeflector
|
|
mwa XHit xdraw ; why? !!!
|
|
NoTankHitAtEndOfFight
|
|
NoHitAtEndOfFight
|
|
NoDefence
|
|
rts ; END !!!
|
|
AutoDefence
|
|
; now run defensive-aggressive weapon - Auto Defence!
|
|
sbb #255 LeapFrogAngle Angle ; swap angle (LeapFrogAngle - because we have strored angle in this variable)
|
|
lsrw Force ; Force = Force / 2 - becouse earlier we multiplied by 2
|
|
mva #1 Erase ; now erase shield
|
|
phx
|
|
jsr DrawTankShield
|
|
jsr DrawTankShieldHorns
|
|
plx
|
|
lda #$00
|
|
sta Erase
|
|
sta ActiveDefenceWeapon,x ; deactivate used Auto Defence
|
|
sta ShieldEnergy,x
|
|
sta xtraj ; prepare coordinates
|
|
sta ytraj
|
|
sta xtraj+2
|
|
sta ytraj+2
|
|
mwa XHit xtraj+1
|
|
sbw YHit #5 ytraj+1
|
|
mva #1 color
|
|
jmp RepeatFlight ; and repeat Fight
|
|
.endp
|
|
|
|
.proc SecondFlight
|
|
; ---------------- copied code fragment from before firing. not too elegant.
|
|
; ---------------- get fire parameters again
|
|
ldx TankNr
|
|
lda ForceTableL,x
|
|
sta Force
|
|
lda ForceTableH,x
|
|
sta Force+1
|
|
lda #$0
|
|
sta Force+2
|
|
lda AngleTable,x
|
|
sta Angle
|
|
|
|
lda #0
|
|
sta color
|
|
sta xtraj
|
|
sta ytraj
|
|
|
|
lda xtankstableL,x
|
|
sta xtraj+1
|
|
lda xtankstableH,x
|
|
sta xtraj+2
|
|
lda ytankstable,x
|
|
sta ytraj+1
|
|
lda #$00
|
|
sta ytraj+2
|
|
|
|
ldy Angle
|
|
clc
|
|
lda xtraj+1
|
|
adc EndOfTheBarrelX,y ; correction of X
|
|
sta xtraj+1
|
|
lda xtraj+2
|
|
adc #0
|
|
sta xtraj+2
|
|
sec
|
|
lda ytraj+1
|
|
sbc EndOfTheBarrelY,y ; correction of Y
|
|
sta ytraj+1
|
|
lda ytraj+2
|
|
sbc #0
|
|
sta ytraj+2
|
|
|
|
ldy #100 ; ???
|
|
mva #1 tracerflag ; I do not know (I mean I think I know ;) )
|
|
; 10 years later - I do not know!!!
|
|
; 20 years later - still do not know :]
|
|
jmp Flight.RepeatIfSmokeTracer
|
|
.endp
|
|
|
|
; -------------------------------------------------
|
|
.proc MIRVdownLoop
|
|
; MIRV loop - here mirv bullets fall down
|
|
; -------------------------------------------------
|
|
; copy Flight parameters to the table
|
|
ldx #4
|
|
MIRVcopyParameters
|
|
lda xtraj
|
|
sta xtraj00,x
|
|
lda xtraj+1
|
|
sta xtraj01,x
|
|
lda xtraj+2
|
|
sta xtraj02,x
|
|
lda vx
|
|
sta vx00,x
|
|
lda vx+1
|
|
sta vx01,x
|
|
lda vx+2
|
|
sta vx02,x
|
|
lda vx+3
|
|
sta vx03,x
|
|
lda #0
|
|
sta MirvDown,x
|
|
dex
|
|
bpl MIRVcopyParameters
|
|
; modification (to make bullets "split away" and go different directions)
|
|
; bullet indexed 0 is in the middle
|
|
|
|
; bullet 1
|
|
clc
|
|
lda vx+1
|
|
adc #100
|
|
sta vx01+1
|
|
lda vx+2
|
|
adc #0
|
|
sta vx02+1
|
|
lda vx+3
|
|
adc #0
|
|
sta vx03+1
|
|
; bullet 2
|
|
sec
|
|
lda vx+1
|
|
sbc #100
|
|
sta vx01+2
|
|
lda vx+2
|
|
sbc #0
|
|
sta vx02+2
|
|
lda vx+3
|
|
sbc #0
|
|
sta vx03+2
|
|
; bullet 3
|
|
clc
|
|
lda vx+1
|
|
adc #200
|
|
sta vx01+3
|
|
lda vx+2
|
|
adc #0
|
|
sta vx02+3
|
|
lda vx+3
|
|
adc #0
|
|
sta vx03+3
|
|
; bullet 4
|
|
sec
|
|
lda vx+1
|
|
sbc #200
|
|
sta vx01+4
|
|
lda vx+2
|
|
sbc #0
|
|
sta vx02+4
|
|
lda vx+3
|
|
sbc #0
|
|
sta vx03+4
|
|
|
|
; clearing ranges of soil down registers
|
|
mwa #screenwidth RangeLeft
|
|
lda #0
|
|
sta RangeRight
|
|
sta RangeRight+1
|
|
|
|
ldx #$FF ; it will turn 0 in a moment anyway
|
|
stx MirvMissileCounter
|
|
mrLoopi
|
|
inc:lda MirvMissileCounter
|
|
cmp #5
|
|
sne:mva #0 MirvMissileCounter
|
|
|
|
ldx MirvMissileCounter
|
|
; Y changes only for bullet number 0
|
|
; because rest of the bullets have the same Y (height)
|
|
|
|
bne MIRVdoNotChangeY
|
|
; Y is the same for all falling bullets
|
|
;ytraj=ytraj-vy (skipping least significant byte of vy)
|
|
sec
|
|
lda ytraj
|
|
sbc vy+1
|
|
sta ytraj
|
|
lda ytraj+1
|
|
sbc vy+2
|
|
sta ytraj+1
|
|
lda ytraj+2
|
|
sbc vy+3
|
|
sta ytraj+2
|
|
|
|
;vy=vy-g (also without least significant byte of vy)
|
|
sec
|
|
lda vy+1
|
|
sbc gravity
|
|
sta vy+1
|
|
lda vy+2
|
|
sbc #0
|
|
sta vy+2
|
|
lda vy+3
|
|
sbc #0
|
|
sta vy+3
|
|
|
|
jsr ShellDelay
|
|
|
|
MIRVdoNotChangeY
|
|
|
|
lda MirvDown,x ; if bullet is already down we go with the next one
|
|
jne MIRVnextBullet
|
|
|
|
clc ;xtraj=xtraj+vx (skipping the least significant byte of vx)
|
|
lda xtraj00,x ;and here of course Flight to the right
|
|
adc vx01,x
|
|
sta xtraj00,x
|
|
lda xtraj01,x
|
|
adc vx02,x
|
|
sta xtraj01,x
|
|
lda xtraj02,x
|
|
adc vx03,x
|
|
sta xtraj02,x
|
|
|
|
;vx=vx+Wind
|
|
|
|
clc
|
|
.rept 4
|
|
lda vx+#
|
|
adc Wind+#
|
|
sta vx+#
|
|
.endr
|
|
|
|
; rules for a falling MIRV bulets.
|
|
; if Y is negative and any X (bullet over the screen) - continue flying
|
|
; if (Y>=0 and Y<=screenhight) and X>screenwidth (bullet off-screen on the left or right side) - continue flying
|
|
; if (Y>=0 and Y<=screenhight) and X<=screenwidth (bullet on the screen) - check collision
|
|
; if Y>screenhight and X>screenwidth (bullet under the screen on the left or right side) - stop flying without hit
|
|
; if Y>screenhight and X<=screenwidth (bullet under the screen) - check collision (allways hit)
|
|
|
|
; check bullet position and set flags:
|
|
; XposFlag - bullet positon X (0 - on screen , %1000000 - off-screen)
|
|
; YposFlag - bullet positon Y (0 - on screen , %1000000 - over the screen , %0100000 - under the screen)
|
|
lda #$00
|
|
sta XposFlag
|
|
sta YposFlag
|
|
lda ytraj+2 ; Y high byte
|
|
bpl @+
|
|
mva #%10000000 YposFlag ; bullet over the screen (Y)
|
|
bmi MIRVsetXflag
|
|
@
|
|
lda ytraj+1 ; Y low byte
|
|
cmp #screenheight
|
|
bcc MIRVsetXflag ; bullet on screen (Y)
|
|
mva #%01000000 YposFlag ; bullet under the screen (Y)
|
|
MIRVsetXflag
|
|
lda xtraj02,x ; X high byte
|
|
cmp #>screenwidth
|
|
bne @+
|
|
lda xtraj01,x ; X low byte
|
|
cmp #<screenwidth
|
|
@
|
|
bcc MIRVXonscreen
|
|
mva #%10000000 XposFlag ; bullet off-screen (X)
|
|
MIRVXonscreen
|
|
|
|
; X and Y position flags sets
|
|
; then realize rules
|
|
|
|
lda YposFlag
|
|
jmi MIRVcontinueFly ; Y over the screen
|
|
bne MIRVYunderscreen ; Y under the screen
|
|
; Y on screen
|
|
bit XposFlag
|
|
jmi MIRVcontinueFly ; Y on screen and X off-screen
|
|
jpl MIRVcheckCollision ; X and Y on screen
|
|
MIRVYunderscreen
|
|
bit XposFlag
|
|
jpl MIRVcheckCollision ; X on screen and Y under screen
|
|
; Y under screen and X off-screen
|
|
; stop flying
|
|
jmi mrEndOfFlight
|
|
|
|
MIRVcontinueFly
|
|
mwa #0 xdraw
|
|
mwa #screenheight-1 ydraw
|
|
bit XposFlag
|
|
bmi @+ ; no pixels to plot
|
|
; plot bullets over the screen
|
|
mwa #0 ydraw
|
|
;mwa xtraj01 xdraw
|
|
lda xtraj01,x
|
|
sta xdraw
|
|
lda xtraj02,x
|
|
sta xdraw+1
|
|
@
|
|
jsr unPlot.unPlotAfterX
|
|
jmp mrLoopi
|
|
|
|
MIRVcheckCollision
|
|
|
|
; checking works only with xdraw and ydraw so copy there all we need
|
|
lda xtraj01,x
|
|
sta xdraw
|
|
lda xtraj02,x
|
|
sta xdraw+1
|
|
mwa ytraj+1 ydraw
|
|
mva #0 HitFlag
|
|
jsr CheckCollisionWithTank
|
|
ldx MirvMissileCounter
|
|
lda HitFlag
|
|
bne mrHit
|
|
|
|
;mwa xtraj01 temp
|
|
clc
|
|
lda xtraj01,x
|
|
adc #<mountaintable
|
|
sta temp
|
|
lda xtraj02,x
|
|
adc #>mountaintable
|
|
sta temp+1
|
|
|
|
ldy #0
|
|
lda ytraj+1
|
|
cmp (temp),y ; check collision witch mountains
|
|
bcs mrHit
|
|
|
|
mrSkipCollisionCheck
|
|
;mwa xtraj01 xdraw
|
|
lda xtraj01,x
|
|
sta xdraw
|
|
lda xtraj02,x
|
|
sta xdraw+1
|
|
mwa ytraj+1 ydraw
|
|
|
|
jsr unPlot.unPlotAfterX
|
|
ldx MirvMissileCounter
|
|
jne mrLoopi
|
|
|
|
jmp mrLoopi
|
|
|
|
mrHit
|
|
; we have to make unPlot over the screen (to initialise it)
|
|
; before actual explosion
|
|
mwa #0 xdraw
|
|
mwa #screenheight-1 ydraw
|
|
jsr unPlot.unPlotAfterX
|
|
ldx MirvMissileCounter
|
|
ldy #0
|
|
; concurrent moving xtraj+1 -> xdraw and calculating temp
|
|
clc
|
|
lda xtraj01,x
|
|
sta xdraw
|
|
adc #<mountaintable
|
|
sta temp
|
|
lda xtraj02,x
|
|
sta xdraw+1
|
|
adc #>mountaintable
|
|
sta temp+1
|
|
lda (temp),y
|
|
sec
|
|
sbc #1
|
|
sta ydraw
|
|
sty ydraw+1 ;we know that y=0
|
|
jsr missile ; explode ....
|
|
|
|
mrEndOfFlight
|
|
ldx MirvMissileCounter
|
|
mwa #0 xdraw
|
|
mwa #screenheight-1 ydraw
|
|
jsr unPlot.unPlotAfterX
|
|
ldx MirvMissileCounter
|
|
lda #1
|
|
sta MirvDown,x
|
|
MIRVnextBullet
|
|
; checking if all bullets already fallen down
|
|
ldx #4
|
|
MIRVcheckIfEnd
|
|
lda MirvDown,x
|
|
beq MIRVstillNotAll
|
|
dex
|
|
bpl MIRVcheckIfEnd
|
|
bmi MIRValreadyAll
|
|
MIRVstillNotAll
|
|
jmp mrLoopi
|
|
MIRValreadyAll
|
|
mwa xdraw xcircle ; we must store them (for a while)
|
|
mwa ydraw ycircle ; xdraw and ydraw
|
|
mwa #0 xdraw
|
|
mwa #screenheight-1 ydraw
|
|
ldx MirvMissileCounter
|
|
jsr unPlot.unPlotAfterX
|
|
mwa xcircle xdraw
|
|
mwa ycircle ydraw
|
|
|
|
; we must do it manually because of the VOID pointer
|
|
|
|
;first clean the offensive text...
|
|
ldy TankNr
|
|
mva #0 plot4x4color
|
|
jsr DisplayOffensiveTextNr
|
|
|
|
; temporary removing tanks from the screen (otherwise they will fall down with soil)
|
|
mva TankNr tempor2
|
|
mva #1 Erase
|
|
jsr drawtanks
|
|
mva tempor2 TankNr
|
|
mva #0 Erase
|
|
jsr SoilDown2
|
|
mva #$ff HitFlag ; but why ??
|
|
;jsr drawtanks
|
|
rts
|
|
.endp
|
|
|
|
; -------------------------------------------------
|
|
.proc WhiteFlag
|
|
; -------------------------------------------------
|
|
; This routine is run from inside of the main loop
|
|
; and replaces Shoot and Flight routines
|
|
; X and TankNr - index of shooting tank
|
|
; -------------------------------------------------
|
|
mva #sfx_death_begin sfx_effect
|
|
jsr FlashTank ; first we flash tank
|
|
mva #1 Erase
|
|
jsr DrawTankNr ; and erase tank
|
|
mva #0 Erase
|
|
ldx TankNr
|
|
sta Energy,x ; clear tank energy
|
|
sta eXistenZ,x ; erase from existence
|
|
sta LASTeXistenZ,x ; to prevent explosion
|
|
sta ActiveDefenceWeapon,x ; deactivate White Flag
|
|
jsr PMoutofScreen
|
|
jsr drawtanks ; for restore PM
|
|
mva #sfx_silencer sfx_effect
|
|
rts
|
|
.endp
|
|
|
|
; -------------------------------------------------
|
|
.proc NuclearWinter
|
|
; -------------------------------------------------
|
|
; This routine is run from inside of the main loop
|
|
; and replaces Shoot and Flight routines
|
|
; X and TankNr - index of shooting tank
|
|
; -------------------------------------------------
|
|
mva #sfx_sandhog sfx_effect
|
|
ldy #0 ; byte counter (from 0 to 39)
|
|
NextColumn
|
|
; big loop - we repat internal loops for each column of bytes
|
|
sty magic
|
|
ldx #120 ; line counter (from 0 to 60 )
|
|
; first loop - inverse column of bytes for a while
|
|
ldy magic
|
|
NextLine1
|
|
jsr InverseScreenByte
|
|
dex
|
|
dex
|
|
bpl NextLine1
|
|
;
|
|
wait ; wait uses A and Y
|
|
; second loop - inverse again and put random "snow" to column of bytes
|
|
ldx #120
|
|
ldy magic
|
|
mva #$55 magic+1
|
|
NextLine2
|
|
jsr InverseScreenByte
|
|
lda random
|
|
ora magic+1
|
|
and (temp),y
|
|
sta (temp),y
|
|
lda magic+1
|
|
eor #$ff
|
|
sta magic+1
|
|
dex
|
|
dex
|
|
bpl NextLine2
|
|
; and go to next column
|
|
iny
|
|
cpy #40
|
|
bne NextColumn
|
|
; and we have "snow" :)
|
|
lda #0
|
|
ldx TankNr
|
|
sta ActiveDefenceWeapon,x ; deactivate Nuclear Winter
|
|
|
|
sta RangeLeft ; whole screen in range of soil down
|
|
sta RangeLeft+1
|
|
mwa #screenwidth RangeRight
|
|
jsr SoilDown2
|
|
jsr drawtanks ; for restore PM
|
|
rts
|
|
|
|
; in order to optimize the fragment repeated in both internal loops
|
|
; we save 15 bytes :)
|
|
InverseScreenByte
|
|
lda LineTableL,x
|
|
sta temp
|
|
lda LineTableH,x
|
|
sta temp+1
|
|
lda (temp),y
|
|
eor #$ff
|
|
sta (temp),y
|
|
rts
|
|
.endp
|
|
|
|
; -------------------------------------------------
|
|
.proc CheckCollisionWithTank
|
|
; -------------------------------------------------
|
|
; Check collision with Tank :)
|
|
; xdraw , ydraw - coordinates of the checked point
|
|
; results:
|
|
; HitFlag - $ff - hit ground, 0 - no hit, 1-6 - hit tank (index+1)
|
|
; XHit , YHit - coordinates of hit
|
|
; X - index of the hit tank
|
|
|
|
ldx #0
|
|
CheckCollisionWithTankLoop
|
|
lda eXistenZ,x
|
|
beq DeadTank
|
|
; first we test top and bottom (same with and without shield!)
|
|
lda ytankstable,x
|
|
cmp ydraw ; check range
|
|
bcc BelowTheTank ;(ytankstable,ytankstable+3)
|
|
sbc #4 ; we must rewrite EndOfTheBarrelY table or remove Y correction completely to "bold" tank !!!
|
|
cmp ydraw
|
|
bcs OverTheTank
|
|
; with or without shield ?
|
|
lda ShieldEnergy,x
|
|
bne CheckCollisionWithShieldedTank ; tank with shield is bigger :)
|
|
|
|
lda xtankstableH,x
|
|
cmp xdraw+1
|
|
bne @+
|
|
lda xtankstableL,x
|
|
cmp xdraw
|
|
@
|
|
bcs LeftFromTheTank ;add 8 double byte
|
|
; now we use Y as low byte and A as high byte of checked position (right edge of tank)
|
|
; it is tricky but fast and much shorter
|
|
clc
|
|
adc #8
|
|
tay
|
|
lda xtankstableH,x
|
|
adc #0
|
|
cmp xdraw+1
|
|
bne @+
|
|
cpy xdraw
|
|
@
|
|
bcc RightFromTheTank
|
|
TankHit
|
|
inx
|
|
stx HitFlag ; index of hit tank+1
|
|
dex
|
|
mwa xdraw XHit
|
|
mwa ydraw YHit
|
|
rts ; in X there is an index of the hit tank
|
|
RightFromTheTank
|
|
LeftFromTheTank
|
|
OverTheTank
|
|
BelowTheTank
|
|
DeadTank
|
|
inx
|
|
cpx NumberOfPlayers
|
|
bne CheckCollisionWithTankLoop
|
|
rts
|
|
CheckCollisionWithShieldedTank
|
|
; now we use Y as low byte and A as high byte of checked position (left right edgs of shield)
|
|
; it is tricky but fast and much shorter
|
|
lda xtankstableL,x
|
|
sec
|
|
sbc #4 ; 5 pixels more on left side
|
|
tay
|
|
lda xtankstableH,x
|
|
sbc #0
|
|
; bmi ShieldOverLeftEdge ; I do not know whether to check it. Probably not :) !!!
|
|
cmp xdraw+1
|
|
bne @+
|
|
cpy xdraw
|
|
@
|
|
bcs LeftFromTheTank
|
|
tya ;add 16 double byte
|
|
clc
|
|
adc #16
|
|
tay
|
|
lda xtankstableH,x
|
|
adc #0
|
|
cmp xdraw+1
|
|
bne @+
|
|
cpy xdraw
|
|
@
|
|
bcc RightFromTheTank
|
|
bcs TankHit
|
|
.endp
|
|
;--------------------------------------------------
|
|
CalculateExplosionRange0
|
|
;--------------------------------------------------
|
|
|
|
;the same as below, but without summing up
|
|
;(for the first or single explosion)
|
|
|
|
;zero soil fall out ranges
|
|
mwa #screenwidth RangeLeft
|
|
lda #0
|
|
sta RangeRight
|
|
sta RangeRight+1
|
|
mva #11 ExplosionRadius ; what is this magic value?
|
|
;--------------------------------------------------
|
|
.proc CalculateExplosionRange
|
|
;--------------------------------------------------
|
|
;calculates total horizontal range of explosion by
|
|
;"summing up" ranges of all separate explosions
|
|
|
|
adw xdraw ExplosionRadius WeaponRangeRight
|
|
cpw WeaponRangeRight #screenwidth-1
|
|
bcc NotOutOfTheScreenRight
|
|
mwa #screenwidth-1 WeaponRangeRight
|
|
|
|
NotOutOfTheScreenRight
|
|
sbw xdraw ExplosionRadius WeaponRangeLeft
|
|
lda WeaponRangeLeft+1
|
|
bpl NotOutOfTheScreenLeft
|
|
lda #0
|
|
sta WeaponRangeLeft
|
|
sta WeaponRangeLeft+1
|
|
NotOutOfTheScreenLeft
|
|
|
|
cpw RangeLeft WeaponRangeLeft
|
|
bcc CheckRangeRight
|
|
mwa WeaponRangeLeft RangeLeft
|
|
CheckRangeRight
|
|
cpw RangeRight WeaponRangeRight
|
|
bcs RangesChecked
|
|
mwa WeaponRangeRight RangeRight
|
|
RangesChecked
|
|
|
|
rts
|
|
.endp
|
|
|
|
;--------------------------------------------------
|
|
.proc DecreaseWeaponBeforeShoot
|
|
;--------------------------------------------------
|
|
ldx TankNr
|
|
lda ActiveWeapon,x
|
|
jsr DecreaseWeapon
|
|
; and here we have amount of possessed ammo for given weapon
|
|
sta WeaponDepleted
|
|
; ;cmp #0
|
|
; bne AmmunitionDecreased
|
|
; ;lda #0 ;if ammo for given weapon ends
|
|
; sta ActiveWeapon,x ;then set to default weapon (baby missile)
|
|
;AmmunitionDecreased
|
|
; lda #99
|
|
; ldy #0
|
|
; sta (weaponPointer),y ;baby missile - always 99 pieces
|
|
;
|
|
; ;there is a good value in weaponPointer after jsr DecreaseWeapon
|
|
;
|
|
rts
|
|
.endp
|
|
|
|
;--------------------------------------------------
|
|
.proc DecreaseWeapon
|
|
; in: A: Weapon number, TankNr
|
|
; out: A: number of shells left, Y: weapon number
|
|
; decreases 1 bullet from a weapon(A) of tank(TankNr)
|
|
;--------------------------------------------------
|
|
jsr HowManyBullets
|
|
beq noBullets ; no bullets - no decreasing (additional check)
|
|
cpy #0
|
|
beq defaultWeapon ; no decreasing Baby Missile
|
|
sec
|
|
sbc #1
|
|
sta (weaponPointer),y ; we have good values after HowManyBullets
|
|
defaultWeapon
|
|
noBullets
|
|
rts
|
|
.endp
|
|
|
|
;--------------------------------------------------
|
|
.proc HowManyBullets
|
|
; in: A <-- Weapon number, TankNr
|
|
; out: A <-- How many bullets in the weapon, Y: weapon number
|
|
; how many bullets weapon of tank(TankNr) has, Result in A
|
|
;--------------------------------------------------
|
|
tay
|
|
ldx TankNr
|
|
lda TanksWeaponsTableL,x
|
|
sta weaponPointer
|
|
lda TanksWeaponsTableH,x
|
|
sta weaponPointer+1
|
|
|
|
lda (weaponPointer),y ; and we have number of bullets in A
|
|
rts
|
|
.endp
|
|
|
|
;--------------------------------------------------
|
|
.proc ShellDelay
|
|
lda CONSOL
|
|
cmp #6
|
|
beq noShellDelay
|
|
ldx flyDelay
|
|
DelayLoop
|
|
lda VCOUNT
|
|
@ cmp VCOUNT
|
|
beq @-
|
|
dex
|
|
bne DelayLoop
|
|
noShellDelay
|
|
rts
|
|
.endp
|
|
|
|
.ENDIF
|
|
|