mirror of
https://github.com/pkali/scorch_src.git
synced 2026-05-20 22:34:21 +02:00
Completly new tank falling procedure (70bytes saved!)
And now the tank loses 2 units of energy per pixel (vertical only)
This commit is contained in:
Pecusx
+106
-173
@@ -1354,13 +1354,12 @@ ShotUnderGround
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rts
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.endp
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;--------------------------------------------------
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.proc TankFalls;
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;--------------------------------------------------
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mva #sfx_shield_off sfx_effect
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lda #0
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sta PreviousFall
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sta PreviousFall ; bit 7 - left, bit 6 - right
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sta EndOfTheFallFlag
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sta Parachute
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@@ -1376,6 +1375,21 @@ ShotUnderGround
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ParachuteActive
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inc Parachute
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TankFallsX
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; clear previous position
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mva #1 Erase
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jsr DrawTankNr
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; and the parachute (if present)
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lda Parachute
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and #01
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beq DoNotClearParachute
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; here we clear the parachute
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ldx TankNr
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jsr DrawTankParachute
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DoNotClearParachute
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mva #0 Erase
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ldx TankNr
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lda EndOfTheFallFlag ; We only get byte below the tank if still falling
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bne NoGroundCheck
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; coordinates of the first pixel under the tank
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ldx TankNr
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lda XtankstableL,x
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@@ -1388,9 +1402,8 @@ TankFallsX
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; time in our lives! Tada! It opens a new chapter!!!
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sta ydraw
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;
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; lda #0
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; sta UnderTank1 ; byte under tank
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; sta UnderTank2 ; byte under tank reversed (for simple check right direction)
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; UnderTank1 ; byte under tank
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; UnderTank2 ; byte under tank reversed (for simple check right direction)
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lda #08
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sta temp ; Loop Counter
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ByteBelowTank
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@@ -1408,145 +1421,79 @@ ROLPoint2
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rol UnderTank1
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inw xdraw
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dec temp
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bne ByteBelowTank
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ldx #0
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lda UnderTank1
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bne NotDown
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inx ; set bit 0 - go down
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NotDown
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stx IfFallDown
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; now we must check falling direction
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ldx #7 ; SlideLeftTable length -1 (from 0 to 7)
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@ lda SlideLeftTable,x
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cmp UnderTank1
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beq SetLeftBit
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cmp UnderTank2
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beq SetRightBit
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dex
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bpl @-
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bmi NoLeftOrRight
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SetLeftBit
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lda IfFallDown
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ora #%100 ; set bit 2 - go left
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bne @+
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SetRightBit
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lda IfFallDown
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ora #%010 ; set bit 1 - go right
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@ sta IfFallDown
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cpx #0
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bne InfinityLoopFix
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ora #%001 ; temporary fix!!! for %10000000 and %00000001
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sta IfFallDown
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InfinityLoopFix
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NoLeftOrRight
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lda IfFallDown ; taking directions of falling down from the table
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bne ItStillFalls
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; Tank falling down already finished, but it is not sure that
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; the horizontal coordinate is even.
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; If it is odd then it must be corrected because otherwise
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; P/M graphics background would not look OK
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bne ByteBelowTank
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NoGroundCheck
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ldx TankNr
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lda XtanksTableL,x
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and #$01
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jeq EndOfFall ; if it is even then it is the end
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; and if not, we push it one pixel the way it was falling before
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lda PreviousFall
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sta IfFallDown
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inc EndOfTheFallFlag ; because after this correction is shouldn't fall anymore
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; we have 3 bits: 0 - go down, 1 - go right, 2 - go left
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;---
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ItStillFalls
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lda Parachute
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lda UnderTank1
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bne NoFallingDown
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; Tank falling down ----
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lda Parachute
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and #1
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bne ParachutePresent
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; decreasing energy - if the vertical fall, substract 2
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; and if at an angle then substract 1
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ldy #1 ; how much energy to substract
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lda IfFallDown
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and #1
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beq NoFallingDown
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ldx TankNr
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; decreasing energy
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ldy #2 ; how much energy to substract
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jsr DecreaseEnergyX
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; lda IfFallDown
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; and #%110
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; bne FallDiagonally
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; ldx TankNr
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; jsr DecreaseEnergyX
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FallDiagonally
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NoFallingDown
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ParachutePresent
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; check parachute type
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lda ActiveDefenceWeapon,x
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cmp #ind_StrongParachute ; strong parachute
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bne OneTimeParachute
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; decreasing energy of parachute - if the vertical fall, substract 2
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; and if at an angle then substract 1
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ldy #1 ; how much energy to substract
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lda IfFallDown
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and #1
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beq NoFallingDown2
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ldx TankNr
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; decreasing energy of parachute
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ldy #2 ; how much energy to substract
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jsr DecreaseShieldEnergyX
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cpy #0 ; is necessary to reduce tenk energy ?
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beq @+
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jsr DecreaseEnergyX
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@
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ldy #1
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lda IfFallDown
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and #6
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bne FallDiagonally2
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ldx TankNr
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jsr DecreaseShieldEnergyX
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cpy #0 ; is necessary to reduce tenk energy ?
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beq @+
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jsr DecreaseEnergyX
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@
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; check energy of parachute
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; check energy of parachute
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lda ShieldEnergy,x
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bne OneTimeParachute
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mva #0 Parachute
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mva #0 ActiveDefenceWeapon,x ; deactivate defence weapon (parachute)
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; and now we must clear parachute symbol
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mva #1 Erase
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jsr DrawTankParachute
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FallDiagonally2
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NoFallingDown2
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mva #0 ActiveDefenceWeapon,x ; deactivate defence
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OneTimeParachute
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; we must set flag meaning that the tank was falling down
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; because later maybe the number of parachutes will decrease
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; (if there were parachutes and they were ON)
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lda Parachute
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ora #2 ; we set bit nr 1 (nr 0 means that parachute is present)
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sta Parachute
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testowanie
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; storing last direction of falling
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; (it is not necessarily the direction from the previous
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; iteraction, so we must check directional bits before storing)
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lda IfFallDown
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and #$06
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beq FallStraightDown
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sta PreviousFall
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FallStraightDown
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lda Parachute
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and #01
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beq RapidFalling
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wait
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RapidFalling
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; we finish falling down if the tank reached the edge of the screen
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; but if it falls straight down or the other way than the edge,
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; then continue falling!
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ldx TankNr
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; tank is falling down - modify coorinates
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lda Ytankstable,x
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clc
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adc #1
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sta Ytankstable,x
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jmp EndOfFCycle
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NoFallingDown
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; check direction (left or right)
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ldy #7 ; SlideLeftTable length -1 (from 0 to 7)
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@ lda SlideLeftTable,y
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cmp UnderTank1
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beq FallingRight
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cmp UnderTank2
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beq FallingLeft
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dey
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bpl @-
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bmi NoLeftOrRight
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FallingLeft
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bit PreviousFall ; bit 6 - right
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bvs EndLeftFall
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; we finish falling left if the tank reached the edge of the screen
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lda XtanksTableL,x
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bne NotLeftEdge
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lda XtanksTableH,x
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bne NotLeftEdge
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lda IfFallDown
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and #$04 ; check if it does not fall left
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jne EndOfFall ; if so then maybe we finish
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beq EndLeftFall
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NotLeftEdge
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; tank is falling left - modify coorinates
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clc
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lda XtankstableL,x
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adc #1
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sta XtankstableL,x
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lda XtankstableH,x
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adc #0
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sta XtankstableH,x
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mva #%10000000 PreviousFall ; set bit 7 - left
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bne EndOfFCycle
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FallingRight
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bit PreviousFall ; bit 7 - left
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bmi EndRightFall
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; we finish falling right if the tank reached the edge of the screen
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clc
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lda XtanksTableL,x
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adc #$08 ; we'll check right side of the char
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@@ -1555,46 +1502,8 @@ NotLeftEdge
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adc #0
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sta temp+1
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cpw temp #screenwidth
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bne NotRightEdge
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lda IfFallDown
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and #$02 ; check if it does not fall right
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jne EndOfFall ; if so then maybe we finish
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NotRightEdge
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; clear previous position
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mva #1 Erase
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jsr DrawTankNr
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; and the parachute (if present)
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lda Parachute
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and #01
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beq DoNotClearParachute
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; here we clear the parachute
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ldx TankNr
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jsr DrawTankParachute
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DoNotClearParachute
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mva #0 Erase
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ldx TankNr
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lsr IfFallDown ; bit nr 0 (down)
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bcc DoesNotFallDown
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; tank is falling down
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lda Ytankstable,x
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clc
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adc #1
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sta Ytankstable,x
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DoesNotFallDown
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lsr IfFallDown ; bit nr 1 (right)
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bcc DoesNotFallLeft
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; tank is falling left
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clc
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lda XtankstableL,x
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adc #1
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sta XtankstableL,x
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lda XtankstableH,x
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adc #0
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sta XtankstableH,x
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DoesNotFallLeft
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lsr IfFallDown ; bit nr 2 (left)
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bcc DoesNotFallRight
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; tank is falling right
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beq EndRightFall
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; tank is falling right - modify coorinates
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sec
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lda XtankstableL,x
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sbc #1
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@@ -1602,44 +1511,68 @@ DoesNotFallLeft
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lda XtankstableH,x
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sbc #0
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sta XtankstableH,x
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DoesNotFallRight
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jsr DrawTankNr
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mva #%01000000 PreviousFall ; set bit 6 - right
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bne EndOfFCycle
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EndLeftFall
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EndRightFall
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NoLeftOrRight
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inc EndOfTheFallFlag ; after this is shouldn't fall
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EndOfFCycle
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; draw tank on new position
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jsr DrawTankNr ; ew have TankNr in X (I hope :) )
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; checking is parachute present and if so, draw it
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lda Parachute
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and #01
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beq DoNotDrawParachute
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; here we draw parachute
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ldx TankNr
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jsr DrawTankParachute
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wait ; onli if tank with patachute
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RapidFalling
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DoNotDrawParachute
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lda EndOfTheFallFlag
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jeq TankFallsX
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lda EndOfTheFallFlag
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jeq TankFallsX
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; Tank falling down already finished, but it is not sure that
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; the horizontal coordinate is even.
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; If it is odd then it must be corrected because otherwise
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; P/M graphics background would not look OK
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ldx TankNr
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lda XtanksTableL,x
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and #$01
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beq EndOfFall ; if it is even then it is the end
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; and if not, we push it one pixel the way it was falling before
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lda #%10000000 ; set "virtual ground" for right falling
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ldy #%00000001
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bit PreviousFall
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bmi ForceFallLeft
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tay ; tricky - replaces ldy #%10000000
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lda #%00000001 ; set "virtual ground" for left falling
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ForceFallLeft
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sta UnderTank1
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sty UnderTank2
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jne TankFallsX
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EndOfFall
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jsr DrawTankNr
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mva #1 Erase
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ldx TankNr
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; if tank was falling down having parachute,
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; we must deduct one parachute
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lda Parachute
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cmp #$03 ; was falling down and the parachute
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bne ThereWasNoParachute
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; first we clear parachute on the screen
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mva #1 Erase
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ldx TankNr
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bne NoParachuteWeapon
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; first we check type of parachute
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lda ActiveDefenceWeapon,x
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cmp #ind_Parachute______ ; deactivate weapon only if parachute (54)
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bne NoParachuteWeapon
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mva #0 ActiveDefenceWeapon,x ; deactivate defence weapon (parachute)
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NoParachuteWeapon
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; now we clear parachute on the screen
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jsr DrawTankParachute
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mva #0 Erase
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ldx TankNr
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jsr DrawTankNr ; redraw tank after erase parachute (exactly for redraw leaky schield :) )
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ThereWasNoParachute
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mva #sfx_silencer sfx_effect
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rts
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.endp
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;--------------------------------------------------
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