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scorch_src/circle_test.asm
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Pirx 990931176e WIP circle test (not working)
2024-11-05 14:12:15 -05:00

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NASM
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icl 'Atari/lib/ATARISYS.ASM'
icl 'Atari/lib/MACRO.ASM'
screenheight = 200
screenbytes = 40
screenwidth = screenBytes*8 ; Max screenwidth = 512!!!
FirstZpageVariable = $50
.zpvar DliColorBack .byte = FirstZpageVariable
.zpvar ClearSky .byte ; $ff - Crear sky during drawmountains, 0 - no clear sky
.zpvar PaddleState .byte ; old state 2nd button for 2 buttons joysticks
.zpvar GradientNr .byte
.zpvar GradientColors .word
.zpvar JoystickNumber .byte
.zpvar LazyFlag .byte ; 7 bit - run Lazy Darwin, 6 bit - run Lazy Boy or Darwin (!) after inventory
; 0 - nothing
.zpvar SpyHardFlag .byte ; >$7f - run SpyHard after inventory
.zpvar Vdebug .byte ; "visual debug" flag ($00 - off, $ff - on)
.zpvar xdraw .word ; = $64 ;variable X for plot
.zpvar ydraw .word ; variable Y for plot
; (like in Atari Basic - Y=0 in upper right corner of the screen)
.zpvar xbyte .word
.zpvar ybyte .word
.zpvar CharCode .byte
.zpvar fontind .word
.zpvar tanknr .byte
.zpvar oldplot .word
.zpvar xc .word
.zpvar temp .word ; temporary word for the most embeded loops only
.zpvar temp2 .word ; same as above
.zpvar modify .word ; origially used to replace self-modyfying code
.zpvar tempXROLLER .word ; same as above for XROLLER routine (used also in result display routine)
.zpvar xtempDRAW .word ; same as above for XDRAW routine
.zpvar ytempDRAW .word ; same as above for XDRAW routine
.zpvar tempor2 .word
.zpvar CreditsVScrol .byte
;--------------temps used in circle routine
.zpvar xi .word ; X (word) in draw routine
.zpvar fx .byte
.zpvar yi .word ; Y (word) in draw routine
.zpvar fy .byte
.zpvar xk .word
.zpvar fs .byte
.zpvar yc .byte ; ycircle - temporary for circle
.zpvar dx .word
.zpvar dy .word
.zpvar dd .word
.zpvar di .word
.zpvar dp .word
;----------------------------
.zpvar UnderTank1 .byte
.zpvar UnderTank2 .byte
;----------------------------
.zpvar TestFlightFlag .byte ; For AI test flights ($ff - test, $00 - standard shoot flight)
.zpvar weaponPointer .word
.zpvar dliCounter .byte
.zpvar pressTimer .byte
.zpvar NTSCcounter .byte
.zpvar sfx_effect .byte
.zpvar RMT_blocked .byte
.zpvar ScrollFlag .byte
.zpvar SkStatSimulator .byte
.zpvar FloatingAlt .byte ; floating tank altitude
.zpvar OverTankDir .byte ; (0 go right, $ff go left) direction of bypassing tanks on screen
; --------------OPTIMIZATION VARIABLES--------------
.zpvar Force .word
.zpvar Force_ .byte ; Force is 3 bytes long
.zpvar Angle .byte
.zpvar Parachute .byte ; are you insured with parachute?
.zpvar color .byte
.zpvar Erase .byte ; if 1 only mask of the character is printed
; on the graphics screen. if 0 character is printed normally
.zpvar radius .byte
.zpvar decimal .word
.zpvar NumberOfPlayers .byte ; current number of players (counted from 1)
.zpvar Counter .byte ; temporary Counter for outside loops
.zpvar ExplosionRadius .byte
.zpvar FunkyBombCounter .byte
.zpvar ResultY .byte
.zpvar xcircle .word
.zpvar ycircle .word
.zpvar vy .word
.zpvar vy_ .word ; 4 bytes
.zpvar vx .word
.zpvar vx_ .word ; 4 bytes
.zpvar HitFlag .byte ; $ff when missile hit ground, $00 when no hit,
; $01-$06 tank index+1 when hit tank
.zpvar PositionOnTheList .byte ; pointer position on the list being displayed
.zpvar FirstKeypressDelay .byte
.zpvar IsEndOfTheFallFlag .byte ;for small speedup ground falling
.zpvar TankSequencePointer .byte
.zpvar WindChangeInRound .byte ; wind change after each turn (not round only) flag
; (0 - round only, >0 - each turn)
.zpvar RandomMountains .byte ; mountains type change after each turn flag
; (0 - round only, >0 - each turn)
.zpvar FastSoilDown .byte ; 0 - standard, >0 - fast
.zpvar BlackHole .byte ; 0 - no, >0 - yes
.zpvar XHit .word
.zpvar delta .word
.zpvar HowMuchToFall .byte
.zpvar magic .word ; worst var name in the whole business
.zpvar xtraj .word
.zpvar xtraj_ .byte ; 3 bytes
.zpvar ytraj .word
.zpvar ytraj_ .byte ; 3 bytes
.zpvar Wind .word
.zpvar Wind_ .word ; 4 bytes
.zpvar RangeLeft .word
.zpvar RangeRight .word
.zpvar NewAngle .byte
.zpvar escFlag .byte ; 7 bit - Exit game,
; 6 bit - Exit to GameOver (cleared - exit to Menu), 0 - nothing
.zpvar LineYdraw .byte
.zpvar LineXdraw .word
.zpvar plot4x4color .byte ; $00 / $ff
.zpvar Multiplier .word
.zpvar Multiplier_ .byte ; 3 bytes
.zpvar HowToDraw .byte
.zpvar DrawDirFactor .byte
.zpvar gravity .byte
.zpvar LineLength .word
.zpvar tracerflag .byte
.zpvar isInventory .byte
.zpvar DifficultyLevel .byte
.zpvar goleft .byte
.zpvar OffsetDL1 .byte
.zpvar L1 .byte
;-----------------------------------------------
; variable declarations in RAM (no code)
;-----------------------------------------------
ORG $2000
; These tebles are at the beginning of memory pages becouse ....
bittable1_long
.ds $100
bittable2_long
.ds $100
linetableL
.ds (screenHeight)
linetableH
.ds (screenHeight)
oldora .DS [5]
OldOraTemp .DS 1
oldplotH .DS [5]
oldplotL .DS [5]
oldply .DS [5]
WhichUnPlot .DS 1
;--------------------------------------------------
.proc GenerateLineTable
mwa #display temp
mwa #linetableL temp2
mwa #linetableH modify
ldy #0
@ lda temp
sta (temp2),y
lda temp+1
sta (modify),y
adw temp #screenwidth
iny
cpy #0 ;#screenheight+1
bne @-
; and bittables for fastest plot and point (thanks @jhusak)
ldy #0
lda #$40
@ asl
adc #0
sta bittable1_long,y
tax
eor #%11111111
sta bittable2_long,y
txa
dey
bne @-
endof
rts
.endp
; -----------------------------------------
.proc unPlot
; plots a point and saves the plotted byte, reverts the previous plot.
; -----------------------------------------
ldx #0 ; only one pixel
unPlotAfterX
stx WhichUnPlot
; first remake the oldie
lda oldplotL,x
sta oldplot
lda oldplotH,x
sta oldplot+1
ldy oldply,x
lda oldora,x
sta (oldplot),y
; is it not out of the screen ????
cpw ydraw #screenheight
jcc CheckX
mwa #0 ydraw
CheckX
cpw xdraw #screenwidth
jcs EndOfUnPlot
MakeUnPlot
; let's count coordinates taken from xdraw and ydraw
;xbyte = xbyte/8
lda xdraw+1
lsr
lda xdraw
ror ;just one bit over 256. Max screenwidth = 512!!!
lsr
lsr
;---
tay
ldx WhichUnPlot
;tya
sta oldply,x
ldx ydraw
lda linetableL,x
sta xbyte
sta oldplot
lda linetableH,x
sta xbyte+1
sta oldplot+1
; lda xdraw
; and #$7
; tax
ldx xdraw ; optimization (256 bytes long bittable)
lda color
bne ClearUnPlot
;plotting here
lda (xbyte),y
sta OldOraTemp
ora bittable1_long,x
sta (xbyte),y
bne ContinueUnPlot ; allways <>0
ClearUnPlot
lda (xbyte),y
sta OldOraTemp
and bittable2_long,x
sta (xbyte),y
ContinueUnPlot
ldx WhichUnPlot
lda OldOraTemp
sta oldora,x
lda oldplot
sta oldplotL,x
lda oldplot+1
sta oldplotH,x
; and now we must solve the problem of several plots
; in one byte
ldx #4
ldy WhichUnPlot
LetsCheckOverlapping
cpx WhichUnPlot
beq SkipThisPlot
lda oldplotL,x
cmp oldplotL,y
bne NotTheSamePlot
lda oldplotH,x
cmp oldplotH,y
bne NotTheSamePlot
lda oldply,x
cmp oldply,y
bne NotTheSamePlot
; the pixel is in the same byte so let's take correct contents
lda oldora,x
sta oldora,y
NotTheSamePlot
SkipThisPlot
dex
bpl LetsCheckOverlapping
EndOfUnPlot
rts
.endp
; -----------------------------------------
.proc plot ;plot (xdraw, ydraw, color)
; color == 1 --> put pixel
; color == 0 --> erase pixel
; xdraw (word) - X coordinate
; ydraw (word) - Y coordinate
; this is one of the most important routines in the whole
; game. If you are going to speed up the game, start with
; plot - it is used by every single effect starting from explosions
; through line drawing and small text output!!!
;
; Optimized by 0xF (Fox) THXXXX!!!
; -----------------------------------------
; is it not over the screen ???
cpw ydraw #(screenheight+1); changed for one additional line. cpw ydraw #(screenheight-1)
bcs unPlot.EndOfUnPlot ;nearest RTS
CheckX02
cpw xdraw #screenwidth
bcs EndOfPlot
MakePlot
; let's calculate coordinates from xdraw and ydraw
;xbyte = xbyte/8
lda xdraw+1
lsr
lda xdraw
ror ;just one bit over 256. Max screenwidth = 512!!!
lsr
lsr
sta xbyte
;---
ldx ydraw
ldy linetableL,x
lda linetableH,x
sta xbyte+1
; lda xdraw
; and #$7
; tax
ldx xdraw ; optimization (256 bytes long bittable)
lda color
bne ClearPlot
lda (xbyte),y
ora bittable1_long,x
sta (xbyte),y
EndOfPlot
rts
ClearPlot
lda (xbyte),y
and bittable2_long,x
sta (xbyte),y
rts
.endp
icl 'circle1.asm'
;icl 'circle2.asm'
start
;jsr generatelinetable
halt
run start
.align $1000
.ds 10
display
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