hgr: lines: vlin

add some hgr_vlin code
This commit is contained in:
Vince Weaver 2022-03-14 13:29:33 -04:00
parent 5d3ba6d7cb
commit ad103d2feb
3 changed files with 356 additions and 2 deletions

View File

@ -7,12 +7,13 @@ EMPTY_DISK = ../../../empty_disk
all: lines.dsk
lines.dsk: HELLO LINES LINES_ROM HLIN_TEST
lines.dsk: HELLO LINES LINES_ROM HLIN_TEST VLIN_TEST
cp $(EMPTY_DISK)/empty.dsk lines.dsk
$(DOS33) -y lines.dsk SAVE A HELLO
$(DOS33) -y lines.dsk BSAVE -a 0x0C00 LINES
$(DOS33) -y lines.dsk BSAVE -a 0x0C00 LINES_ROM
$(DOS33) -y lines.dsk BSAVE -a 0x0C00 HLIN_TEST
$(DOS33) -y lines.dsk BSAVE -a 0x0C00 VLIN_TEST
###
@ -49,10 +50,18 @@ HLIN_TEST: hlin_test.o
hlin_test.o: hlin_test.s hgr_hlin.s
ca65 -o hlin_test.o hlin_test.s -l hlin_test.lst
###
VLIN_TEST: vlin_test.o
ld65 -o VLIN_TEST vlin_test.o -C $(LINKER_SCRIPTS)/apple2_c00.inc
vlin_test.o: vlin_test.s hgr_vlin.s
ca65 -o vlin_test.o vlin_test.s -l vlin_test.lst
###
clean:
rm -f *~ *.o *.lst HELLO LINES LINES_ROM HLIN_TEST
rm -f *~ *.o *.lst HELLO LINES LINES_ROM HLIN_TEST VLIN_TEST

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@ -0,0 +1,111 @@
;=================================
; Simple Vertical LINE
;=================================
; line from (x,a) to (x,a+y)
; todo: use Carry to say if X>255
hgr_vlin:
; don't handle run of 0
cpy #0
beq done_hgr_vlin
; get initial ROW into (GBASL)
sta current_row_smc+1 ; save current A
sty vlin_row_count
lda div7_table,X
sta x1_save_smc+1
lda mod7_table,X
tax
lda vlin_masks,X
sta vlin_mask_smc+1
hgr_vlin_loop:
current_row_smc:
lda #$dd
ldx #0 ; doesn't matter
ldy #0 ; always 0
jsr HPOSN ; (Y,X),(A) (values stores in HGRX,XH,Y)
; important part is row is in GBASL/GBASH
; HPOSN also shifts color odd/even for us
; HPOSN also puts X1/7 into Y
x1_save_smc:
ldy #$dd
lda (GBASL),Y
eor HGR_BITS
vlin_mask_smc:
and #$dd
eor (GBASL),Y
sta (GBASL),Y
inc current_row_smc+1
dec vlin_row_count
bne hgr_vlin_loop
done_hgr_vlin:
rts
vlin_row_count: .byte $00
vlin_masks:
.byte $81,$82,$84,$88,$90,$A0,$C0
;==========================
; shift colors
;==========================
; 00000000 and 10000000 => no change (black)
; 01111111 and 11111111 => no change? (white)
; 01010101 => invert 00101010
shift_colors:
lda HGR_BITS
asl
cmp #$C0
bpl done_shift_colors
lda HGR_BITS
eor #$7f
sta HGR_BITS
done_shift_colors:
rts
;==========================
; set color
;==========================
; color in X
set_hcolor:
lda COLORTBL,X
sta HGR_COLOR
rts
; notes
; 4+3
; 0000 CCCC 0000 1111
; 0000 000C 0000 0001
; 4000 = 80 80
; 4400 = 81 81
; 4800 = 83 83
; 4C00 = 87 87
; 5000 = 8F 8F
; 5400 = 9F 9F
; 5800 = BF BF
;----
; 5C00 = FF FF
; 4080 = ff 81 FF 81
; 4480 = ff 83
; 4880 = ff 87
; 4c80 = ff 8F
; 5080 = ff 9f
; 5480 = ff bf
;-----------
; 5880 = ff ff
; 5c80 = ff ff 81

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@ -0,0 +1,234 @@
; hgr fast vlin test
HGR_BITS = $1C
GBASL = $26
GBASH = $27
HGR_COLOR = $E4
HGR_PAGE = $E6
div7_table = $9000
mod7_table = $9100
KEYPRESS = $C000
KEYRESET = $C010
HGR2 = $F3D8 ; clear PAGE2 to 0
HGR = $F3E2 ; set hires page1 and clear $2000-$3fff
BKGND0 = $F3F4 ; clear screen to A
HPOSN = $F411 ; (Y,X),(A) (values stores in HGRX,XH,Y)
COLOR_SHIFT = $F47E
COLORTBL = $F6F6
main:
; set graphics
jsr HGR
; init tables
jsr vgi_init
; draw lines
; multicolor
; for y=0 to 150 step 2:hgr_vlin 10,10+y at y: next
ldy #0
loop1:
tya
lsr
lsr
and #$7
tax
jsr set_hcolor
tya
pha
tax ; X1=Y
lda #10 ; Y1=A
; ldy #100 ; Run = y
jsr hgr_vlin ; vlin (x,a) to (x,a+y)
pla
tay
iny
iny
iny
iny
cpy #160
bne loop1
jsr wait_until_keypress
; test 2
jsr HGR2
; draw lines
ldy #0
loop2:
ldx #7 ; draw white
jsr set_hcolor
tya ; save y on stack
pha
tax ; x1=Y
tay ; yrun=y
lda #0 ; y1=0
jsr hgr_vlin
pla
tay
iny
iny
iny
iny
iny
cpy #150
bne loop2
jsr wait_until_keypress
; test 3
; jsr HGR2
; note, clear to bgcolor=black2 or else edge looks a bit
; ragged when $FF touches $00
lda #$80
jsr BKGND0
; draw lines
ldy #0
loop3:
ldx #7 ; draw white
jsr set_hcolor
tya
pha
tax ; X1=Y
; Y1=A
pha
tya
eor #$ff
sec
adc #191
tay ; run=191-Y
pla
jsr hgr_vlin
pla
tay
iny
cpy #192
bne loop3
jsr wait_until_keypress
; test 4
jsr HGR2
; draw lines
ldy #0
loop4:
ldx #3 ; draw white1
jsr set_hcolor
tya
pha
tax ; X1=Y
eor #$ff
sec
adc #192 ; Y1=192-Y
; run = Y
jsr hgr_vlin
pla
tay
iny
cpy #192
bne loop4
jsr wait_until_keypress
done:
jmp main
wait_until_keypress:
bit KEYRESET
keypress_loop:
lda KEYPRESS
bpl keypress_loop
rts
;=====================
; make /7 %7 tables
;=====================
vgi_init:
vgi_make_tables:
ldy #0
lda #0
ldx #0
div7_loop:
sta div7_table,Y
inx
cpx #7
bne div7_not7
clc
adc #1
ldx #0
div7_not7:
iny
bne div7_loop
ldy #0
lda #0
mod7_loop:
sta mod7_table,Y
clc
adc #1
cmp #7
bne mod7_not7
lda #0
mod7_not7:
iny
bne mod7_loop
rts
.include "hgr_vlin.s"