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c5264a2d8341275d14a67e46c82e7a49ef5455b9
scorch_src/grafproc.asm
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Pirx c5264a2d83 build 127
2022-02-14 00:19:27 -05:00

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; @com.wudsn.ide.asm.mainsourcefile=scorch.asm
.IF *>0 ;this is a trick that prevents compiling this file alone
;--------------------------------------------------
draw .proc ;;fuxxing good draw :)
;--------------------------------------------------
;creditz to Dr Jankowski / MIM U.W.
; (xi,yi)-----(xk,yk)
;20 DX=XK-XI
;30 DY=YK-YI
;40 DP=2*DY
;50 DD=2*(DY-DX)
;60 DI=2*DY-DX
;70 REPEAT
;80 IF DI>=0
;90 DI=DI+DD
;100 YI=YI+1
;110 ELSE
;120 DI=DI+DP
;130 ENDIF
;140 plot XI,YI
;150 XI=XI+1
;160 UNTIL XI=XK
; begin: xdraw,ydraw - end: xbyte,ybyte
; let's store starting coordinates
; will be needed, because everything is calculated relatively
mwa #0 LineLength
mwa xdraw xtempDRAW
mwa ydraw ytempDRAW
; if line goes our of the screen we are not drawing it, but...
cpw xdraw #screenwidth
bcs DrawOutOfTheScreen
cpw xbyte #screenwidth
bcs DrawOutOfTheScreen
;cpw ydraw #screenheight
;bcs DrawOutOfTheScreen
;cpw ybyte #screenheight
;bcc DrawOnTheScreen
lda ydraw+1
bne DrawOutOfTheScreen
lda ybyte+1
beq DrawOnTheScreen
DrawOutOfTheScreen
;jsr DrawJumpPad
rts
DrawOnTheScreen
; constant parameters
; XI=0 ,YI=0
lda #0
sta XI
sta XI+1
sta YI
sta YI+1
; setting the direction controll bits
cpw ydraw ybyte
bcc LineDown
; here one line up
; we are setting bit 0
mva #1 HowToDraw ;here we can because it's first operation
; we are subctracting Yend from Ybegin (reverse order)
; DY=YI-YK
sbw ydraw ybyte DY
jmp CheckDirectionX
LineDown
; one line down here
; we are setting bit 0
mva #0 HowToDraw ;here we can because it's first operation
; substract Ybegin from Yend (normal order)
; DY=YK-YI
sbw ybyte ydraw DY
CheckDirectionX
cpw xdraw xbyte
bcc LineRight
; here goes line to the left
; we set bit 1
lda HowToDraw
ora #$02
sta HowToDraw
; substract Xend from Xbegin (reverse)
; DX=XI-XK
sbw xdraw xbyte DX
jmp CheckDirectionFactor
LineRight
; here goes one line to the right
; we clear bit 0
; we can do nothing because the bit is cleared!
;lda HowToDraw
;and #$FD
;sta HowToDraw
; substracting Xbegin from Xend (normal way)
; DX=XK-XI
sbw xbyte xdraw DX
CheckDirectionFactor
; here we check Direction Factor
; I do not know if we are using proper English word
; but the meaning is 'a' in y=ax+b
; lda DX
; we already have DX in A
cpw DX DY
bcc SwapXY
; 'a' factor is fire, so we copy parameters
; XK=DX
mwa DX XK
; i kasowanie bitu 2
; and bit 2 clear
; (is not needed because already cleared)
;lda HowToDraw
;and #$FB
;sta HowToDraw
jmp LineParametersReady
SwapXY
; not this half of a quarter! - parameters must be swapped
; XK=DY
; DY=DX
; DX=XK - because DY is there so DY and DX are swapped
; YK ... not used
mwa DY XK
mwa DX DY
mwa XK DX
; and let's set bit 2
lda HowToDraw
ora #$04
sta HowToDraw
LineParametersReady
; let's check if length is not zero
lda DX
ora DX+1
ora DY
ora DY+1
jeq EndOfDraw
; here we have DX,DY,XK and we know which operations
; are to be performed with these factors when doing PLOT
; (accordingly to given bits of 'HowToDraw')
; Now we must calculate DP, DD and DI
; DP=2*DY
; DD=2*(DY-DX)
; DI=2*DY-DX
mwa DY DP
aslw DP
sbw DY DX DD
aslw DD
mwa DY DI
aslw DI
sbw DI DX
DrawLoop
; REPEAT
; IF DI>=0
lda DI+1
bmi DINegative
; DI=DI+DD
; YI=YI+1
adw DI DD
adw YI #1
jmp drplot
DINegative
; ELSE
; DI=DI+DP
adw DI DP
drplot ; Our plot that checks how to calculate pixels.
; In xtempDRAW and ycircle there are begin coordinates
; of our line
; First we check the 'a' factor (like in y=ax+b)
; If necessary we swap XI and YI
; (as we can not change XI and YI we move XI to temp2
; and YI to temp)
lda HowToDraw
and #$04
bne SwappedXY
mwa XI temp
mwa YI temp2
jmp CheckPlotY
SwappedXY
mwa XI temp2
mwa YI temp
CheckPlotY
lda HowToDraw
and #01
bne LineGoesUp
; here we know that line goes down and we are not changing Y
adw temp2 ytempDRAW ydraw ; YI
jmp CheckPlotX
LineGoesUp
; line goes up here - we are reversing Y
sbw ytempDRAW temp2 ydraw ; YI
CheckPlotX
lda HowToDraw
and #02
bne LineGoesLeft
; here we know that line goes right and we are not changing X
adw temp xtempDRAW xdraw ; XI
jmp PutPixelinDraw
LineGoesLeft
; line goes left - we are reversing X
sbw xtempDRAW temp xdraw ; XI
PutPixelinDraw
jsr DrawJumpPad
; end of the special PLOT for DRAW
; XI=XI+1
; UNTIL XI=XK
adw XI #1
cpw XI XK
jne DrawLoop
EndOfDraw
mwa xtempDRAW xdraw
mva ytempDRAW ydraw
rts
.endp
DrawJumpPad
jmp (DrawJumpAddr)
Drawplot
jmp plot
DrawLen
adw LineLength #1
rts
DrawCheck .proc
; lda SmokeTracerFlag
; bne yestrace ; jakie to g�upie....
lda tracerflag
ora SmokeTracerFlag
yestrace
beq notrace
jsr plot
notrace
;aftertrace
lda HitFlag
bne StopHitChecking
CheckCollisionDraw
; checking collision!
lda ydraw+1
bne StopHitChecking
jsr CheckCollisionWithTank
lda HitFlag
bne StopHitChecking
mwa xdraw temp
;adw temp --- it does not work!!!!!!!! and should? OMC ??? #mountaintable
clc
lda temp
adc #<mountaintable
sta temp
lda temp+1
adc #>mountaintable
sta temp+1
ldy #0
lda ydraw
cmp (temp),y
bcc StopHitChecking
mva #1 HitFlag
mwa xdraw XHit
mwa ydraw YHit
StopHitChecking
rts
.endp
;--------------------------------------------------
circle .proc ;fxxxing good circle drawing :)
;--------------------------------------------------
;Turbo Basic source
; R=30
; XC=0:YC=R
; FX=0:FY=8*R:FS=4*R+3
; WHILE FX<FY
; splot8 //splot8 are eight plotz around the circle
; XC=XC+1
; FX=FX+8
; IF FS>0
; FS=FS-FX-4
; ELSE
; YC=YC-1
; FY=FY-8
; FS=FS-FX-4+FY
; ENDIF
; WEND
; splot8
mwa xdraw xcircle
mva ydraw ycircle
mwa #0 xc
mva radius yc
mva #0 fx
mva radius fy
asl FY
asl FY
mva FY FS
asl FY
clc
lda FS
adc #3
sta FS
circleloop
lda FX
cmp FY
bcs endcircleloop
jsr splot8
inc XC
clc
lda FX
adc #8
sta FX
lda FS
beq else01
bmi else01
sec
sbc FX
sbc #4
sta FS
jmp endif01
else01
dec YC
sec
lda FY
sbc #8
sta FY
lda FS
sec
sbc FX
sbc #4
clc
adc FY
sta FS
endif01
jmp circleloop
endcircleloop
jsr splot8
mwa xcircle xdraw
mva ycircle ydraw
rts
.endp
;----
splot8 .proc
; plot xcircle+XC,ycircle+YC
; plot xcircle+XC,ycircle-YC
; plot xcircle-XC,ycircle-YC
; plot xcircle-XC,ycircle+YC
; plot xcircle+YC,ycircle+XC
; plot xcircle+YC,ycircle-XC
; plot xcircle-YC,ycircle-XC
; plot xcircle-YC,ycircle+XC
clc
lda xcircle
adc XC
sta xdraw
lda xcircle+1
adc #0
sta xdraw+1
;clc
lda ycircle
adc YC
sta ydraw
sta tempcir
jsr plot
sec
lda ycircle
sbc YC
sta ydraw
jsr plot
sec
lda xcircle
sbc XC
sta xdraw
lda xcircle+1
sbc #0
sta xdraw+1
jsr plot
lda tempcir
sta ydraw
jsr plot
;---
clc
lda xcircle
adc yC
sta xdraw
lda xcircle+1
adc #0
sta xdraw+1
;clc
lda ycircle
adc xC
sta ydraw
sta tempcir
jsr plot
sec
lda ycircle
sbc xC
sta ydraw
jsr plot
sec
lda xcircle
sbc yC
sta xdraw
lda xcircle+1
sbc #0
sta xdraw+1
jsr plot
lda tempcir
sta ydraw
jsr plot
RTS
.endp
;--------------------------------------------------
WaitForKeyRelease .proc
;--------------------------------------------------
lda SKSTAT
cmp #$ff
beq KeyIsReleased
cmp #$f7
bne WaitForKeyRelease
KeyIsReleased
rts
.endp
;--------------------------------------------------
clearscreen .proc
;--------------------------------------------------
lda #0
tax
Loopi1
sta display,x
sta display+$100,x
sta display+$200,x
sta display+$300,x
sta display+$400,x
sta display+$500,x
sta display+$600,x
sta display+$700,x
sta display+$800,x
sta display+$900,x
sta display+$a00,x
sta display+$b00,x
sta display+$c00,x
sta display+$d00,x
sta display+$e00,x
sta display+$f00,x
sta display+$1000,x
sta display+$1100,x
sta display+$1200,x
sta display+$1300,x
sta display+$1400,x
sta display+$1500,x
sta display+$1600,x
sta display+$1700,x
sta display+$1800,x
sta display+$1900,x
sta display+$1a00,x
sta display+$1b00,x
sta display+$1c00,x
sta display+$1d00,x
sta display+$1e00,x
sta display+$1f00,x
inx
bne Loopi1
rts
.endp
;-------------------------------*------------------
placetanks .proc
;--------------------------------------------------
ldx #(MaxPlayers-1) ;maxNumberOfPlayers-1
lda #0
skip09
; clearing the tables with coordinates of the tank
; it is necessary, because randomizing checks
; if the given tank is already placed
; after check if its position is not (0,0)
; I will be honest with you - I have no idea
; what the above comment was intending to mean :)
sta XtankstableL,x
sta XtankstableH,x
sta Ytankstable,x
dex
bpl skip09
mwa #0 temptankX
mva #0 temptankNr ;player number
StillRandomize
ldx NumberOfPlayers
lda random
and #$07
tay
cpy NumberOfPlayers
bcs StillRandomize
lda xtankstableL,y
bne StillRandomize
lda xtankstableH,y
bne StillRandomize
; here we know that we got a random number
; of the tank that is not in use
; this number is in Y
clc
lda temptankX
adc disktance,x
sta temptankX
sta xtankstableL,y
bcc NotHigherByte03
inc temptankX+1
NotHigherByte03
lda temptankX+1
sta xtankstableH,y
INC temptankNr
ldx temptankNr
Cpx NumberOfPlayers
bne StillRandomize
; getting random displacements relative to even positions
ldx #$00
StillRandomize02
lda random
and #$1f ; maximal displacement is 31 pixels
clc
adc xtankstableL,x
sta xtankstableL,x
bcc NotHigherByte02
inc xtankstableH,x
NotHigherByte02
; and we deduct 15 to make the displacement work two ways
sec
lda xtankstableL,x
sbc #$0f
sta xtankstableL,x
bcs NotHigherByte01
dec xtankstableH,x
NotHigherByte01
; and clear lowest bit to be sure that the X coordinate is even
; (this is to have P/M background look nice)
lda xtankstableL,x
and #$fe
sta xtankstableL,x
inx
Cpx NumberOfPlayers
bne StillRandomize02
rts
; during calculating heights of thw mountains
; check if the tank is not somewhere around
; if so, make horizontal line 8 pixels long
CheckTank
ldx NumberOfPlayers
dex
CheckNextTank
lda xtankstableL,x
cmp xdraw
bne UnequalTanks
lda xtankstableH,x
cmp xdraw+1
bne UnequalTanks
lda ydraw
;sec
;sbc #$01 ; minus 1, because it was 1 pixel too high
sta ytankstable,x ; what's the heck is that????!!!!
mva #7 deltaX
mwa #0 delta
UnequalTanks
dex
bpl CheckNextTank
rts
.endp
;-------------------------------------------------
drawtanks
;-------------------------------------------------
lda tanknr
pha
ldx #$00
stx tanknr
DrawNextTank
jsr drawtanknr
inc tanknr
ldx tanknr
Cpx NumberOfPlayers
bne DrawNextTank
pla
sta tankNr
rts
;---------
drawtanknr
ldx tanknr
; let's check the energy
lda eXistenZ,x
bne SkipRemovigPM ; if energy=0 then no tank
; hide P/M
lda #0
sta hposp0,x
jmp DoNotDrawTankNr
SkipRemovigPM
lda AngleTable,x
bmi AngleToLeft01
lda #90
sec
sbc AngleTable,x
tay
lda BarrelTableR,y
jmp CharacterAlreadyKnown
AngleToLeft01
sec
sbc #(255-90)
tay
lda BarrelTableL,y
CharacterAlreadyKnown
sta CharCode
DrawTankNrX
ldx tanknr
lda xtankstableL,x
sta xdraw
lda xtankstableH,x
sta xdraw+1
lda ytankstable,x
sta ydraw
jsr TypeChar
; now P/M graphics on the screen (only for 5 tanks)
; horizontal position
mwa xdraw xbyte
ldx tanknr
cpx #$5
bcs NoPlayerMissile
rorw xbyte ; divide by 2 (carry does not matter)
lda xbyte
clc
adc #$24 ; P/M to graphics offser
cpx #$4 ; 5th tank are joined missiles and offset is defferent
bne NoMissile
clc
adc #$0C
NoMissile
sta hposp0,x
; vertical position
lda pmtableL,x
sta xbyte
lda pmtableH,x
sta xbyte+1
; calculate start position of the tank
lda ydraw
clc
adc #$25 ; P/M to graphics offset
sta temp
; clear sprite and put 3 lines on the tank at the same time
ldy #$00
tya
ClearPM cpy temp
bne ZeroesToGo
lda #$03 ; (2 bits set) we set on two pixels in three lines
sta (xbyte),y
dey
sta (xbyte),y
dey
sta (xbyte),y
dey
lda #$00
ZeroesToGo
sta (xbyte),y
dey
bne ClearPM
NoPlayerMissile
DoNotDrawTankNr
rts
;--------------------------------------------------
drawmountains .proc
;--------------------------------------------------
mwa #0 xdraw
mwa #mountaintable modify
drawmountainsloop
ldy #0
lda (modify),y
sta ydraw
jsr DrawLine
adw modify #1
adw xdraw #1
cpw xdraw #screenwidth
bne drawmountainsloop
rts
;--------------------------------------------------
drawmountainspixel
;--------------------------------------------------
mwa #0 xdraw
mwa #mountaintable modify
drawmountainspixelloop
ldy #0
lda (modify),y
sta ydraw
jsr plot
adw modify #1
adw xdraw #1
cpw xdraw #screenwidth
bne drawmountainspixelloop
rts
.endp
;--------------------------------------------------
SoilDown2 .proc
;--------------------------------------------------
; how it is supposed to work:
; first loop is looking for the highest pixels
; and fills with their Y coordinates both temporary tables
;
; second (main) loop works this way:
; sets end-of-soil-fall-down-flag to 1 ( IsEndOfTheFallFlag=1 )
; goes through the horizontal line checking if
; Y coordinate from the first table equals to height of the peak
; if so, it goes further
; if not:
; sets end-of-soil-fall-down-flag to 0
; increases Y from the first table
; if there is no pixel there it plots here and
; zeroes pixel from the second table and after that
; increases Y of the second table
; repeats with next pixels au to the end of the line
; if the flag is 0 then repeat the main loop
; and that's it :)
;
; I am sorry but after these 4 years I have no idea
; how it works. I have just translated Polish comment
; but I do not understand a word of it :)
; If you know how it works, please write here :))))
jsr PMoutofscreen
; First we look for highest pixels and fill with their coordinates
; both tables
mwa RangeLeft xdraw
adw RangeLeft #mountaintable2 tempor2
adw RangeLeft #mountaintable3 tempor3
NextColumn1
mva #0 ydraw
NextPoint1
jsr point
beq StillNothing
ldy #0
lda ydraw
sta (tempor2),y
sta (tempor3),y
jmp FoundPeek1
StillNothing
inc ydraw
lda ydraw
cmp #screenheight
bne NextPoint1
FoundPeek1
adw tempor2 #1
adw tempor3 #1
adw xdraw #1
;vcmp xdraw,screenwidth,NextColumn1
cpw xdraw RangeRight
bcc NextColumn1
beq NextColumn1
; we have both tables filled with starting values
; main loop starts here
MainFallout2
mwa RangeLeft xdraw
adw RangeLeft #mountaintable temp
adw RangeLeft #mountaintable2 tempor2
adw RangeLeft #mountaintable3 tempor3
mwa #1 IsEndOfTheFallFlag
FalloutOfLine
ldy #0
; is Y coordinate from the first table
; equal to peak height, if so, go ahead
lda (tempor2),y
cmp #screenheight-1 ;cmp (temp),y
bcs ColumnIsReady
; in the other case there are things to be done
sty IsEndOfTheFallFlag ; flag to 0
; we are increasing Y in the first table
;lda (tempor2),y
clc
adc #1
sta (tempor2),y
; and checking if there is a pixel there
sta ydraw
jsr point
bne ThereIsPixelHere
; if no pixel we plot it
mva #1 color
jsr plot.MakePlot
; zeroing pixel from the second table
; and increase Y in second table
ldy #0
lda (tempor3),y
sta ydraw
lda (tempor3),y
clc
adc #1
sta (tempor3),y
sty color
jsr plot.MakePlot
ThereIsPixelHere
ColumnIsReady
adw temp #1
adw tempor2 #1
adw tempor3 #1
adw xdraw #1
;vcmp xdraw,screenwidth,FalloutOfLine
cpw xdraw RangeRight
bcc FalloutOfLine
beq FalloutOfLine
lda IsEndOfTheFallFlag
; we repeat untill at some point first table reaches
; level of the mountains
jeq MainFallout2
; now correct heights are in the second temporary table
; so we copy
mwa RangeLeft xdraw
adw RangeLeft #mountaintable temp
adw RangeLeft #mountaintable3 tempor3
ldy #0
CopyHeights
lda (tempor3),y
sta (temp),y
adw temp #1
adw tempor3 #1
adw xdraw #1
;vcmp xdraw,screenwidth,CopyHeights
cpw xdraw RangeRight
bcc CopyHeights
beq CopyHeights
mva #1 color
rts
.endp
;--------------------------------------------------
calculatemountains .proc
;--------------------------------------------------
mwa #0 xdraw
; starting point
getrandomY ;getting random Y coordinate
sec
lda random
cmp #screenheight-(margin*4) ;it means that max line=199
bcs getrandomY
clc
adc #(margin*2)
sta ydraw
sta yfloat+1
mva #0 yfloat ;yfloat equals to e.g. 140.0
; how to make nice looking mountains?
; randomize points and join them with lines
; Here we do it simpler way - we randomize X (or deltaX)
; and "delta" (change of Y coordinate)
NextPart
lda random
sta delta ; it is after the dot (xxx.delta)
lda random
and #$03 ;(max delta)
sta delta+1 ; before the dot (delta+1.delta)
lda random
and #$01 ;random sign (+/- or up/down)
sta UpNdown
; theoretically we have here ready
; fixed-point delta value
; (-1*(UpNdown))*(delta+1.delta)
;loop drawing one line
ChangingDirection
lda random ;length of the line
and #$0f ;max line length
tax
inx
inx
inx
stx deltaX
OnePart
jsr placeTanks.CheckTank
; checks if at a given X coordinate
; is any tank and if so
; changes parameters of drawing
; to generate flat 8 pixels
; (it will be the place for the tank)
; it also stores Y position of the tank
adw xdraw #mountaintable modify
lda ydraw
ldy #0
sta (modify),y
; Up or Down
lda UpNdown
beq ToBottom
ToTop ;it means substracting
sbw yfloat delta
lda yfloat+1
cmp #margin
bcs Skip01
; if smaller than 10
ldx #$00
stx UpNdown
jmp Skip01
ToBottom
adw yfloat delta
lda yfloat+1
cmp #screenheight-margin
bcc Skip01
; if higher than screen
ldx #$01
stx UpNdown
Skip01
sta ydraw
adw xdraw #1
cpw xdraw #screenwidth
beq EndDrawing
dec deltaX
bne OnePart
jmp NextPart
EndDrawing
rts
.endp
; -----------------------------------------
unPlot .proc
; -----------------------------------------
ldx #0 ; only one pixel
unPlotAfterX
stx WhichUnPlot
; first remake the oldie
lda oldplotL,x
sta oldplot
lda oldplotH,x
sta oldplot+1
lda oldply,x
tay
lda oldora,x
sta (oldplot),y
; is it not out of the screen ????
cpw ydraw #screenheight
jcs EndOfUnPlot
CheckX
cpw xdraw #screenwidth
jcs EndOfUnPlot
MakeUnPlot
; let's count coordinates taken from xdraw and ydraw
mwa xdraw xbyte
lda xbyte
and #$7
sta ybit
lsrw xbyte
rorw xbyte
rorw xbyte
;---
ldy xbyte
ldx WhichUnPlot
tya
sta oldply,x
ldx ydraw
lda linetableL,x
sta xbyte
sta oldplot
lda linetableH,x
sta xbyte+1
sta oldplot+1
ldx ybit
lda color
beq ClearUnPlot
lda (xbyte),y
sta OldOraTemp
ora bittable,x
sta (xbyte),y
jmp ContinueUnPlot
ClearUnPlot
lda (xbyte),y
sta OldOraTemp
and bittable2,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
; -----------------------------------------
plot .proc ;plot (xdraw, ydraw)
; 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!!!
; We tried to keep it clear and therefore it is far from
; optimal speed.
; -----------------------------------------
; is it not over the screen ???
cpw ydraw #(screenheight+1); changed for one additional line. cpw ydraw #(screenheight-1)
bcs unPlot.EndOfUnPlot
CheckX02
cpw xdraw #screenwidth
bcs EndOfPlot ;nearest RTS
MakePlot
; let's calculate coordinates from xdraw and ydraw
mwa xdraw xbyte
lda xbyte
and #$7
sta ybit
;xbyte = xbyte/8
lda xbyte
lsr xbyte+1
ror ;just one bit over 256. Max screenwidht = 512!!!
lsr
lsr
tay ;save
;---
ldx ydraw
lda linetableL,x
sta xbyte
lda linetableH,x
sta xbyte+1
ldx ybit
lda color
beq ClearPlot
lda (xbyte),y
ora bittable,x
sta (xbyte),y
EndOfPlot
rts
ClearPlot
lda (xbyte),y
and bittable2,x
sta (xbyte),y
rts
.endp
; -----------------------------------------
point .proc
; -----------------------------------------
; checks state of the pixel (coordinates in xdraw and ydraw)
; result is in A (zero or appropriate bit is set)
; let's calculate coordinates from xdraw and ydraw
mwa xdraw xbyte
lda xbyte
and #$7
sta ybit
;xbyte = xbyte/8
lda xbyte
lsr xbyte+1
ror ;just one bit over 256. Max screenwidht = 512!!!
lsr
lsr
tay ;save
;---
ldx ydraw
lda linetableL,x
sta xbyte
lda linetableH,x
sta xbyte+1
ldx ybit
lda (xbyte),y
and bittable,x
rts
.endp
; -----------------------------------------
PlotPointer .proc
; -----------------------------------------
; draws pointer that shows where is the bullet
; when it is over the screen
; (it is on the top of the screen)
mwa xdraw tempCir
mva #0 color
mwa #screenHeight ydraw
mwa oldPlotPointerX xdraw
jsr plot
mwa tempCir xdraw
mva #1 color
mwa #screenHeight ydraw
jsr plot
mwa xdraw oldPlotPointerX
rts
.endp
;--------------------------------------------------
DrawLine .proc
;--------------------------------------------------
mva #0 ydraw+1
lda #screenheight
sec
sbc ydraw
sta tempbyte01
jsr plot
;rts
jmp IntoDraw ; jumps inside Draw routine
; because one pixel is already plotted
loopdraw
lda (xbyte),y
ora bittable,x
sta (xbyte),y
IntoDraw adw xbyte #screenBytes
dec tempbyte01
bne loopdraw
rts
.endp
;
; ------------------------------------------
TypeChar .proc
; puts char on the graphics screen
; in: CharCode
; in: left LOWER corner of the char coordinates (xdraw, ydraw)
;--------------------------------------------------
; char to the table
lda CharCode
sta fontind
lda #$00
sta fontind+1
; char intex times 8
aslw fontind
rolw fontind
rolw fontind
adw fontind #TankFont
; and 8 bytes to the table
ldy #7
CopyChar
lda (fontind),y
sta char1,y
lda #$00
sta char2,y
dey
bpl CopyChar
; and 8 subsequent bytes as a mask
adw fontind #8
ldy #7
CopyMask
lda (fontind),y
sta mask1,y
lda #$ff
sta mask2,y
dey
bpl CopyMask
; calculating coordinates from xdraw and ydraw
mwa xdraw xbyte
lda xbyte
and #$7
sta ybit
lsrw xbyte
rorw xbyte
rorw xbyte
;---
ldy xbyte
ldx ydraw
.rept 7
dex
.endr
lda linetableL,x
sta xbyte
lda linetableH,x
sta xbyte+1
; mask preparation and character shifting
ldx ybit
beq MaskOK00
MakeMask00
sec
ror mask1
ror mask2
sec
ror mask1+1
ror mask2+1
sec
ror mask1+2
ror mask2+2
sec
ror mask1+3
ror mask2+3
sec
ror mask1+4
ror mask2+4
sec
ror mask1+5
ror mask2+5
sec
ror mask1+6
ror mask2+6
sec
ror mask1+7
ror mask2+7
lsr char1
ror char2
ror char1+1
ror char2+1
ror char1+2
ror char2+2
ror char1+3
ror char2+3
ror char1+4
ror char2+4
ror char1+5
ror char2+5
ror char1+6
ror char2+6
ror char1+7
ror char2+7
dex
bne MakeMask00
MaskOK00
; here x=0
lda Erase
beq CharLoopi ; it works, because x=0
lda #0
ldx #7
EmptyChar
sta char1,x
sta char2,x
dex
bpl EmptyChar
ldx #0
CharLoopi
lda (xbyte),y
and mask1,x
ora char1,x
sta (xbyte),y
iny
lda (xbyte),y
and mask2,x
ora char2,x
sta (xbyte),y
dey
adw xbyte #screenBytes
inx
cpx #8
bne CharLoopi
rts
.endp
; ------------------------------------------
PutChar4x4 .proc ;puts 4x4 pixels char on the graphics screen
; in: xdraw, ydraw (upper left corner of the char)
; in: CharCode4x4 (.sbyte)
;--------------------------------------------------
lda plot4x4color
sta color
; calculating address of the first byte
mva #4 LoopCounter4x4
lda CharCode4x4
and #1
sta nibbler4x4
lda CharCode4x4
ror
; in carry there is which nibble of the byte is to be taken
clc
adc #(3*32)
sta y4x4
nextline4x4
mva #4 Xcounter4x4
ldy y4x4
lda font4x4,y ;there was a problem with OMC here, but it works now
ldx nibbler4x4
beq uppernibble
asl
asl
asl
asl
uppernibble
rol
sta StoreA4x4
bcs EmptyPixel ; the font I drawn is in inverse ...
;lda plot4x4color ;these lines are not necessary
;sta color ;if a plots are one color only
jsr plot
;jmp Loop4x4Continued
EmptyPixel
;lda #1 ;reverse color (color==1-color)
;sec
;sbc plot4x4color
;sta color
;jsr plot
;this is turned off for speed
;anyway we assume the text is being drawn
;over an empty space
Loop4x4Continued
adw xdraw #1
lda StoreA4x4
dec Xcounter4x4
ldx Xcounter4x4
bne uppernibble
; here we have on screen one line of the char
adw ydraw #1
sbw xdraw #4
sbw y4x4 #32
dec:lda LoopCounter4x4
bne nextline4x4
rts
.endp
; ------------------------------------------
PutChar4x4FULL .proc;
;this routine works just like PutChar4x4,
;but this time all pixels are being drawn
;(empty and not empty)
;--------------------------------------------------
lda plot4x4color
sta color
; calculating address of the first byte
mva #4 LoopCounter4x4
lda CharCode4x4
and #1
sta nibbler4x4
lda CharCode4x4
ror
; in carry there is which nibble of the byte is to be taken clc
clc
adc #(3*32)
sta y4x4
nextline4x4FULL
mva #4 Xcounter4x4
ldy y4x4
lda font4x4,y
ldx nibbler4x4
beq uppernibbleFULL
asl
asl
asl
asl
uppernibbleFULL
rol
sta StoreA4x4
bcs EmptyPixelFULL
lda plot4x4color ;these lines are not necessary
sta color ;if a plots are one color only
jsr plot
jmp Loop4x4ContinuedFULL
EmptyPixelFULL
lda #1 ;reverse color (color==1-color)
sec
sbc plot4x4color
sta color
jsr plot
;this is turned on now
;of course it is slower
Loop4x4ContinuedFULL
adw xdraw #1
lda StoreA4x4
dec Xcounter4x4
ldx Xcounter4x4
bne uppernibbleFULL
; here we have on screen one line of the char
adw ydraw #1
sbw xdraw #4
sbw y4x4 #32
dec:lda LoopCounter4x4
bne nextline4x4FULL
rts
.endp
.endif
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