mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-09-10 08:54:51 +00:00
452 lines
6.6 KiB
ArmAsm
452 lines
6.6 KiB
ArmAsm
.include "zp.inc"
|
|
|
|
|
|
scroll_row1 EQU $8A00
|
|
scroll_row2 EQU $8B00
|
|
scroll_row3 EQU $8C00
|
|
scroll_row4 EQU $8D00
|
|
|
|
SCROLL_LENGTH EQU $E6
|
|
|
|
;================================
|
|
; Clear screen and setup graphics
|
|
;================================
|
|
|
|
jsr clear_screens ; clear top/bottom of page 0/1
|
|
jsr set_gr_page0
|
|
|
|
;===============
|
|
; Init Variables
|
|
;===============
|
|
lda #0
|
|
sta DISP_PAGE
|
|
sta ANGLE
|
|
|
|
;=======================
|
|
; decompress scroll text
|
|
;=======================
|
|
lda #>deater_scroll
|
|
sta INH
|
|
lda #<deater_scroll
|
|
sta INL
|
|
jsr decompress_scroll
|
|
|
|
|
|
scroll_loop:
|
|
|
|
ldx #0
|
|
ldy ANGLE
|
|
|
|
lda DISP_PAGE
|
|
beq draw_page2
|
|
|
|
lda #4
|
|
sta sm1+2
|
|
sta sm2+2
|
|
lda #5
|
|
sta sm3+2
|
|
sta sm4+2
|
|
jmp draw_done
|
|
|
|
draw_page2:
|
|
lda #8
|
|
sta sm1+2
|
|
sta sm2+2
|
|
lda #9
|
|
sta sm3+2
|
|
sta sm4+2
|
|
draw_done:
|
|
|
|
draw_loop:
|
|
|
|
lda scroll_row1,Y
|
|
sm1:
|
|
sta $400,X
|
|
|
|
lda scroll_row2,Y
|
|
sm2:
|
|
sta $480,X
|
|
|
|
lda scroll_row3,Y
|
|
sm3:
|
|
sta $500,X
|
|
|
|
lda scroll_row4,Y
|
|
sm4:
|
|
sta $580,X
|
|
|
|
iny
|
|
inx
|
|
cpx #40
|
|
bne draw_loop
|
|
|
|
;==================
|
|
; flip pages
|
|
;==================
|
|
|
|
jsr page_flip ; 6
|
|
|
|
;==================
|
|
; delay
|
|
;==================
|
|
|
|
lda #125
|
|
jsr WAIT
|
|
|
|
|
|
;==================
|
|
; loop forever
|
|
;==================
|
|
clc
|
|
lda ANGLE
|
|
adc #40
|
|
cmp SCROLL_LENGTH
|
|
bne blah
|
|
lda #0
|
|
sta ANGLE
|
|
jmp scroll_loop
|
|
|
|
blah:
|
|
inc ANGLE
|
|
jmp scroll_loop ; 3
|
|
|
|
|
|
|
|
;=======================
|
|
; decompress scroll
|
|
;=======================
|
|
decompress_scroll:
|
|
ldy #0
|
|
jsr load_and_increment
|
|
sta SCROLL_LENGTH
|
|
|
|
lda #<scroll_row1
|
|
sta OUTL
|
|
lda #>scroll_row1
|
|
sta OUTH
|
|
|
|
decompress_scroll_loop:
|
|
jsr load_and_increment ; load compressed value
|
|
|
|
cmp #$A1 ; EOF marker
|
|
beq done_decompress_scroll ; if EOF, exit
|
|
|
|
pha ; save
|
|
|
|
and #$f0 ; mask
|
|
cmp #$a0 ; see if special AX
|
|
beq decompress_special
|
|
|
|
pla ; note, PLA sets flags!
|
|
|
|
ldx #$1 ; only want to print 1
|
|
bne decompress_run
|
|
|
|
decompress_special:
|
|
pla
|
|
|
|
and #$0f ; check if was A0
|
|
|
|
bne decompress_color ; if A0 need to read run, color
|
|
|
|
decompress_large:
|
|
jsr load_and_increment ; get run length
|
|
|
|
decompress_color:
|
|
tax ; put runlen into X
|
|
jsr load_and_increment ; get color
|
|
|
|
decompress_run:
|
|
sta (OUTL),Y
|
|
pha
|
|
|
|
clc ; increment 16-bit pointer
|
|
lda OUTL
|
|
adc #$1
|
|
sta OUTL
|
|
lda OUTH
|
|
adc #$0
|
|
sta OUTH
|
|
|
|
pla
|
|
|
|
dex ; repeat for X times
|
|
bne decompress_run
|
|
|
|
beq decompress_scroll_loop ; get next run
|
|
|
|
done_decompress_scroll:
|
|
rts
|
|
|
|
|
|
load_and_increment:
|
|
lda (INL),Y ; load and increment 16-bit pointer
|
|
pha
|
|
clc
|
|
lda INL
|
|
adc #$1
|
|
sta INL
|
|
lda INH
|
|
adc #$0
|
|
sta INH
|
|
pla
|
|
rts
|
|
|
|
|
|
;===============================================
|
|
; Variables
|
|
;===============================================
|
|
|
|
.include "deater_scroll.inc"
|
|
|
|
;=====================================================================
|
|
;= ROUTINES
|
|
;=====================================================================
|
|
|
|
|
|
clear_screens:
|
|
;===================================
|
|
; Clear top/bottom of page 0
|
|
;===================================
|
|
|
|
lda #$0
|
|
sta DRAW_PAGE
|
|
jsr clear_top
|
|
jsr clear_bottom
|
|
|
|
;===================================
|
|
; Clear top/bottom of page 1
|
|
;===================================
|
|
|
|
lda #$4
|
|
sta DRAW_PAGE
|
|
jsr clear_top
|
|
jsr clear_bottom
|
|
|
|
rts
|
|
|
|
;==========
|
|
; page_flip
|
|
;==========
|
|
|
|
page_flip:
|
|
; lda $c019 ; wait for vertical refresh
|
|
; bmi page_flip
|
|
|
|
lda DISP_PAGE ; 3
|
|
beq page_flip_show_1 ; 2nt/3
|
|
page_flip_show_0:
|
|
bit PAGE0 ; 4
|
|
lda #4 ; 2
|
|
sta DRAW_PAGE ; DRAW_PAGE=1 ; 3
|
|
lda #0 ; 2
|
|
sta DISP_PAGE ; DISP_PAGE=0 ; 3
|
|
rts ; 6
|
|
page_flip_show_1:
|
|
bit PAGE1 ; 4
|
|
sta DRAW_PAGE ; DRAW_PAGE=0 ; 3
|
|
lda #1 ; 2
|
|
sta DISP_PAGE ; DISP_PAGE=1 ; 3
|
|
rts ; 6
|
|
;====================
|
|
; DISP_PAGE=0 26
|
|
; DISP_PAGE=1 24
|
|
|
|
|
|
|
|
;==========================================================
|
|
; set_gr_page0
|
|
;==========================================================
|
|
;
|
|
set_gr_page0:
|
|
;lda #4
|
|
;sta GR_PAGE
|
|
bit PAGE0 ; set page 0
|
|
bit LORES ; Lo-res graphics
|
|
bit TEXTGR ; mixed gr/text mode
|
|
bit SET_GR ; set graphics
|
|
rts
|
|
|
|
|
|
|
|
;================================
|
|
; hlin_setup
|
|
;================================
|
|
; put address in GBASL/GBASH
|
|
; Ycoord in A, Xcoord in Y
|
|
hlin_setup:
|
|
sty TEMPY ; 3
|
|
tay ; y=A ; 2
|
|
lda gr_offsets,Y ; lookup low-res memory address ; 4
|
|
clc ; 2
|
|
adc TEMPY ; 3
|
|
sta GBASL ; 3
|
|
iny ; 2
|
|
|
|
lda gr_offsets,Y ; 4
|
|
adc DRAW_PAGE ; add in draw page offset ; 3
|
|
sta GBASH ; 3
|
|
rts ; 6
|
|
;===========
|
|
; 35
|
|
;================================
|
|
; hlin_double:
|
|
;================================
|
|
; HLIN Y, V2 AT A
|
|
; Y, X, A trashed
|
|
; start at Y, draw up to and including X
|
|
hlin_double:
|
|
;int hlin_double(int page, int x1, int x2, int at) {
|
|
|
|
jsr hlin_setup ; 41
|
|
|
|
sec ; 2
|
|
lda V2 ; 3
|
|
sbc TEMPY ; 3
|
|
|
|
tax ; 2
|
|
inx ; 2
|
|
;===========
|
|
; 53
|
|
; fallthrough
|
|
|
|
;=================================
|
|
; hlin_double_continue: width
|
|
;=================================
|
|
; width in X
|
|
|
|
hlin_double_continue:
|
|
|
|
ldy #0 ; 2
|
|
lda COLOR ; 3
|
|
hlin_double_loop:
|
|
sta (GBASL),Y ; 6
|
|
inc GBASL ; 5
|
|
dex ; 2
|
|
bne hlin_double_loop ; 2nt/3
|
|
|
|
rts ; 6
|
|
;=============
|
|
; 53+5+X*16+5
|
|
|
|
;================================
|
|
; hlin_single:
|
|
;================================
|
|
; HLIN Y, V2 AT A
|
|
; Y, X, A trashed
|
|
hlin_single:
|
|
|
|
jsr hlin_setup
|
|
|
|
sec
|
|
lda V2
|
|
sbc TEMPY
|
|
|
|
tax
|
|
|
|
; fallthrough
|
|
|
|
;=================================
|
|
; hlin_single_continue: width
|
|
;=================================
|
|
; width in X
|
|
|
|
hlin_single_continue:
|
|
|
|
hlin_single_top:
|
|
lda COLOR
|
|
and #$f0
|
|
sta COLOR
|
|
|
|
hlin_single_top_loop:
|
|
ldy #0
|
|
lda (GBASL),Y
|
|
and #$0f
|
|
ora COLOR
|
|
sta (GBASL),Y
|
|
inc GBASL
|
|
dex
|
|
bne hlin_single_top_loop
|
|
|
|
rts
|
|
|
|
hlin_single_bottom:
|
|
|
|
lda COLOR
|
|
and #$0f
|
|
sta COLOR
|
|
|
|
hlin_single_bottom_loop:
|
|
ldy #0
|
|
lda (GBASL),Y
|
|
and #$f0
|
|
sta (GBASL),Y
|
|
inc GBASL
|
|
dex
|
|
bne hlin_single_bottom_loop
|
|
|
|
rts
|
|
|
|
|
|
;=============================
|
|
; clear_top
|
|
;=============================
|
|
clear_top:
|
|
lda #$00
|
|
|
|
;=============================
|
|
; clear_top_a
|
|
;=============================
|
|
clear_top_a:
|
|
|
|
sta COLOR
|
|
|
|
; VLIN Y, V2 AT A
|
|
|
|
lda #40
|
|
sta V2
|
|
|
|
lda #0
|
|
|
|
clear_top_loop:
|
|
ldy #0
|
|
pha
|
|
|
|
jsr hlin_double
|
|
|
|
pla
|
|
clc
|
|
adc #$2
|
|
cmp #40
|
|
bne clear_top_loop
|
|
|
|
rts
|
|
|
|
clear_bottom:
|
|
lda #$a0 ; NORMAL space
|
|
sta COLOR
|
|
|
|
lda #40
|
|
sta V2
|
|
|
|
clear_bottom_loop:
|
|
ldy #0
|
|
pha
|
|
|
|
jsr hlin_double
|
|
|
|
pla
|
|
clc
|
|
adc #$2
|
|
cmp #48
|
|
bne clear_bottom_loop
|
|
|
|
rts
|
|
|
|
|
|
; move these to zero page for slight speed increase?
|
|
gr_offsets:
|
|
.word $400,$480,$500,$580,$600,$680,$700,$780
|
|
.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
|
|
.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
|