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https://github.com/deater/dos33fsprogs.git
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146 lines
1.9 KiB
ArmAsm
146 lines
1.9 KiB
ArmAsm
; ROM lines example, to use as comparison for the bresenham version
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; by Vince `deater` Weaver <vince@deater.net>
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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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B_X1_L = $F0
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B_X1_H = $F1
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B_Y1 = $F2
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B_X2_L = $F3
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B_X2_H = $F4
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B_Y2 = $F5
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COUNT = $F9
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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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HGLIN = $F53A ; line to (X,A),(Y)
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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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lines:
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jsr HGR2
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reset:
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ldx #0
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stx COUNT
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stx B_X1_H
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stx B_X1_L
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stx B_Y1
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stx B_X2_H
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stx B_X2_L
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lda #191
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sta B_Y2
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left_lines_loop:
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jsr draw_line
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lda B_Y1
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clc
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adc #8
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sta B_Y1
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lda B_X2_L ; 280/24 = 140/12 = 70/6 = 11
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clc
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adc #11
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sta B_X2_L
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bcc noc
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inc B_X2_H
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noc:
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inc COUNT
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inc FRAME
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lda COUNT
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cmp #24
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end:
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bne left_lines_loop
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;================
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; right lines
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;================
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; at this point, count = 24
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; X1, Y1 = 0,192
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; X2, Y2 = 264,192
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; want x1,y1 to go from 264,0 to 0,0
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; want x2,y2 to go from 264,192 to 264,0
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ldx #0
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stx B_Y1
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ldx B_X2_L
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stx B_X1_L
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ldx B_X2_H
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stx B_X1_H
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right_lines_loop:
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jsr draw_line
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lda B_Y2
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sec
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sbc #8
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sta B_Y2
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lda B_X1_L
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sec
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sbc #11
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sta B_X1_L
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bcs noc2
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dec B_X1_H
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noc2:
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dec COUNT
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inc FRAME
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lda COUNT
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beq reset
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bne right_lines_loop
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;================
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; draw line
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draw_line:
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lda FRAME
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; and #$7
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tax
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; ldx #7
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jsr HCOLOR1 ; set color
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ldy B_X1_H
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ldx B_X1_L
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lda B_Y1
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jsr HPLOT0 ; plot at (Y,X), (A)
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ldx B_X2_H
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lda B_X2_L
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ldy B_Y2
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jsr HGLIN ; line to (X,A), (Y)
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rts
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