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hgr: vgi: line support

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This commit is contained in:
Vince Weaver 2021-06-18 15:56:51 -04:00
parent c2edf45b18
commit a5a8694340
3 changed files with 44 additions and 3 deletions
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2
graphics/hgr/vgi/Makefile
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@ -25,7 +25,7 @@ VGI: vgi.o
ld65 -o VGI vgi.o -C $(LINKERSCRIPTS)/apple2_c00.inc
vgi.o: clock.data \
vgi.s vgi_clearscreen.s vgi_rectangle.s vgi_circles.s
vgi.s vgi_clearscreen.s vgi_rectangle.s vgi_circles.s vgi_lines.s
ca65 -o vgi.o vgi.s -l vgi.lst

5
graphics/hgr/vgi/vgi.s
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@ -55,8 +55,8 @@ vgi_rts_table:
.word vgi_simple_rectangle-1 ; 1 = simple rectangle
.word vgi_circle-1 ; 2 = plain circle
.word vgi_filled_circle-1 ; 3 = filled circle
.word all_done-1 ; 4 = dot
.word all_done-1 ; 5 = line to
.word vgi_point-1 ; 4 = dot
.word vgi_lineto-1 ; 5 = line to
.word all_done-1
.word all_done-1
.word all_done-1
@ -75,5 +75,6 @@ all_done:
.include "vgi_clearscreen.s"
.include "vgi_rectangle.s"
.include "vgi_circles.s"
.include "vgi_lines.s"
.include "clock.data"

40
graphics/hgr/vgi/vgi_lines.s Normal file
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@ -0,0 +1,40 @@
; VGI Lines
;========================
; VGI point
;========================
VGI_PCOLOR = P0
VGI_PX = P1
VGI_PY = P2
vgi_point:
ldx VGI_PCOLOR
lda COLORTBL,X
sta HGR_COLOR
ldy #0
ldx VGI_PX
lda VGI_PY
jsr HPLOT0 ; plot at (Y,X), (A)
jmp vgi_loop
;========================
; VGI line to
;========================
VGI_LX = P0
VGI_LY = P1
vgi_lineto:
ldx #0
ldy VGI_LY
lda VGI_LX
jsr HGLIN ; line to (X,A),(Y)
jmp vgi_loop