mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-05-28 17:41:29 +00:00
254 lines
3.5 KiB
ArmAsm
254 lines
3.5 KiB
ArmAsm
; tunnel
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; D0+ used by HGR routines
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HGR_COLOR = $E4
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HGR_PAGE = $E6
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RR = $F5
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COUNT = $F6
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XX = $F7
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MINUSXX = $F8
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YY = $F9
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MINUSYY = $FA
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D = $FB
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R = $FC
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CX = $FD
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CY = $FE
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FRAME = $FF
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; soft-switches
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KEYPRESS = $C000
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KEYRESET = $C010
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; ROM routines
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HGR2 = $F3D8 ; set hires page2 and clear $4000-$5fff
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HGR = $F3E2 ; set hires page1 and clear $2000-$3fff
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HPLOT0 = $F457 ; plot at (Y,X), (A)
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HCOLOR1 = $F6F0 ; set HGR_COLOR to value in X
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COLORTBL = $F6F6
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PLOT = $F800 ; PLOT AT Y,A (A colors output, Y preserved)
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NEXTCOL = $F85F ; COLOR=COLOR+3
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SETCOL = $F864 ; COLOR=A
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SETGR = $FB40 ; set graphics and clear LO-RES screen
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BELL2 = $FBE4
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WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
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tunnel:
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; from R=12 to R=256 or so
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jsr HGR2
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lda #0
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sta RR
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draw_next:
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ldx RR
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lda star_z,X
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tax
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lda radii,X
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sta R
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; lda KEYPRESS
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; bpl draw_next
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; bit KEYRESET
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lda #128
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sta CX
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lda #96
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sta CY
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;===============================
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; draw circle
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;===============================
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; draw circle at (CX,CY) of radius R
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; signed 8-bit math so problems if R > 64?
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; XX=0 YY=R
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; D=3-2*R
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; GOTO6
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lda #0
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sta XX
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lda R
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sta YY
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lda #3
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sec
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sbc R
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sbc R
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sta D
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jmp do_plots
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circle_loop:
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; X=X+1
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inc XX
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lda XX
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and #3
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bne circle_loop
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; IF D>0 THEN Y=Y-1:D=D+4*(X-Y)+10
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lda D
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bmi else
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dec YY
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lda XX
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sec
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sbc YY
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asl
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asl
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clc
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adc D
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adc #10
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jmp store_D
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else:
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; ELSE D=D+4*X+6
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lda XX
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asl
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asl
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clc
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adc D
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adc #6
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store_D:
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sta D
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do_plots:
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; setup constants
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lda XX
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eor #$FF
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sta MINUSXX
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inc MINUSXX
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lda YY
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eor #$FF
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sta MINUSYY
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inc MINUSYY
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; HPLOT CX+X,CY+Y
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; HPLOT CX-X,CY+Y
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; HPLOT CX+X,CY-Y
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; HPLOT CX-X,CY-Y
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; HPLOT CX+Y,CY+X
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; HPLOT CX-Y,CY+X
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; HPLOT CX+Y,CY-X
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; HPLOT CX-Y,CY-X
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; calc X co-ord
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lda #7
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sta COUNT
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pos_loop:
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lda COUNT
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and #$4
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lsr
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tay
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lda COUNT
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lsr
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bcc xnoc
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iny
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xnoc:
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lda CX
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clc
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adc XX,Y
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tax
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; calc y co-ord
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lda COUNT
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lsr
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eor #$2
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tay
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lda CY
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clc
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adc XX,Y
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ldy #0
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jsr HPLOT0 ; plot at (Y,X), (A)
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dec COUNT
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bpl pos_loop
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; IFY>=XTHEN4
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lda YY
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cmp XX
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bcs circle_loop
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done:
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lda RR
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clc
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adc #1
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sta RR
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stop:
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cmp #19
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beq stop
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; GOTO1
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jmp draw_next
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radii:
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.byte <4000, <3200, <1600, <1066, <800, <640, <533, <457
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.byte <400, <355, <320, <290, <266, 246, 228, 213
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.byte 200, 188, 177, 168, 160, 152, 145, 139
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.byte 133, 128, 123, 118, 114, 110, 106, 103
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.byte 100, 96, 94, 91, 88, 86, 84, 82
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.byte 80, 78, 76, 74, 72, 71, 69, 68
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.byte 66, 65, 64, 62, 61, 60, 59, 58
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.byte 57, 56, 55, 54, 53, 52, 51, 50
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.byte 50, 49, 48, 47, 47, 46, 45, 45
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.byte 44, 43, 43, 42, 42, 41, 41, 40
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.byte 40, 39, 39, 38, 38, 37, 37, 36
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.byte 36, 35, 35, 35, 34, 34, 34, 33
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.byte 33, 32, 32, 32, 32, 31, 31, 31
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.byte 30, 30, 30, 29, 29, 29, 29, 28
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.byte 28, 28, 28, 27, 27, 27, 27, 26
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.byte 26, 26, 26, 26, 25, 25, 25, 25
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.byte 25, 24, 24, 24, 24, 24, 23, 23
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.byte 23, 23, 23, 23, 22, 22, 22, 22
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.byte 22, 22, 21, 21, 21, 21, 21, 21
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.byte 21, 20, 20, 20, 20, 20, 20, 20
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.byte 20, 19, 19, 19, 19, 19, 19, 19
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.byte 19, 18, 18, 18, 18, 18, 18, 18
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.byte 18, 18, 17, 17, 17, 17, 17, 17
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.byte 17, 17, 17, 17, 17, 16, 16, 16
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.byte 16, 16, 16, 16, 16, 16, 16, 16
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.byte 16, 15, 15, 15, 15, 15, 15, 15
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.byte 15, 15, 15, 15, 15, 15, 14, 14
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.byte 14, 14, 14, 14, 14, 14, 14, 14
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.byte 14, 14, 14, 14, 14, 13, 13, 13
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.byte 13, 13, 13, 13, 13, 13, 13, 13
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.byte 13, 13, 13, 13, 13, 13, 13, 12
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.byte 12, 12, 12, 12, 12, 12, 12, 12
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; num-stars = 20
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star_z:
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.byte 15,26,38,50,63,75,78,100,112,125,137
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.byte 150,162,175,187,200,212,224,237
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