mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-05-29 08:41:36 +00:00
201 lines
2.7 KiB
ArmAsm
201 lines
2.7 KiB
ArmAsm
; rotate
|
|
|
|
; 117 bytes -- original
|
|
; 114 bytes -- optimize FRAME init
|
|
; 108 bytes -- optimize page flip
|
|
; 139 bytes -- add beeps
|
|
|
|
; zero page
|
|
sinetable=$70
|
|
HGR_X = $E0
|
|
HGR_XH = $E1
|
|
HGR_Y = $E2
|
|
HGR_COLOR = $E4
|
|
HGR_PAGE = $E6
|
|
|
|
|
|
FRAME = $FF
|
|
|
|
PAGE1 = $C054
|
|
PAGE2 = $C055
|
|
|
|
; ROM routines
|
|
|
|
HGR2 = $F3D8
|
|
HGR = $F3E2
|
|
HPOSN = $F411 ; (Y,X),(A) (values stores in HGRX,XH,Y)
|
|
HPLOT0 = $F457 ; plot at (Y,X), (A)
|
|
costable_base = $F5BA
|
|
WAIT = $FCA8
|
|
|
|
;================================
|
|
; Clear screen and setup graphics
|
|
;================================
|
|
thick_sine:
|
|
|
|
jsr HGR ; set hi-res 140x192, page1
|
|
; A and Y both 0 at end
|
|
|
|
; try to get sine table from ROM
|
|
|
|
rom_sine:
|
|
|
|
;==========================================
|
|
; create sinetable using ROM cosine table
|
|
|
|
; ldy #0
|
|
ldx #$f
|
|
sinetable_loop:
|
|
|
|
lda costable_base+1,Y
|
|
force_zero:
|
|
lsr ; rom value is *256
|
|
lsr ; we want *32
|
|
; lsr
|
|
|
|
sta sinetable+$10,Y
|
|
sta sinetable+$00,X
|
|
eor #$FF
|
|
|
|
sec
|
|
adc #$0
|
|
|
|
sta sinetable+$30,Y
|
|
sta sinetable+$20,X
|
|
|
|
lda #0 ; hack, ROM cosine table doesn't
|
|
; have a good zero for some reason
|
|
|
|
iny
|
|
dex
|
|
|
|
beq force_zero
|
|
bpl sinetable_loop
|
|
|
|
|
|
|
|
;======================================
|
|
; draw log #1
|
|
;======================================
|
|
|
|
; x is FF at this point
|
|
|
|
stx HGR_COLOR ; set color to white
|
|
|
|
inx ; X must be 0
|
|
jsr draw_log
|
|
|
|
; X is 0 here
|
|
|
|
;======================================
|
|
; draw log #1
|
|
;======================================
|
|
|
|
|
|
jsr HGR2 ; set hi-res 140x192, page2, fullscreen
|
|
; A and Y both 0 at end
|
|
|
|
inc invert_smc+1 ; draw the opposite pattern
|
|
|
|
jsr draw_log ; X must be 0
|
|
|
|
;======================================
|
|
; flip pages, forever
|
|
;======================================
|
|
|
|
; X is 0 entering
|
|
|
|
flip_loop:
|
|
|
|
; flip pages
|
|
|
|
page_smc:
|
|
lda PAGE1,X
|
|
|
|
; ldy #10
|
|
;sound_loop:
|
|
bit $C030
|
|
; dey
|
|
; bne sound_loop
|
|
|
|
txa
|
|
eor #$1
|
|
tax
|
|
|
|
lda #255
|
|
jsr WAIT
|
|
|
|
beq flip_loop ; bra
|
|
|
|
|
|
;============================
|
|
;============================
|
|
; draw log
|
|
;============================
|
|
;============================
|
|
|
|
draw_log:
|
|
|
|
stx FRAME
|
|
|
|
draw_sine_loop:
|
|
; X is 0 here, either from above, or from end of loop
|
|
|
|
ldx #0 ; HGR_X
|
|
|
|
; offset next time through
|
|
|
|
inc FRAME
|
|
|
|
; X is zero here
|
|
|
|
bit FRAME
|
|
bvc not_done
|
|
|
|
rts ; done
|
|
|
|
not_done:
|
|
|
|
|
|
|
|
circle_loop:
|
|
|
|
; get sine value
|
|
|
|
invert_smc:
|
|
lda #$0
|
|
beq skip_invert
|
|
|
|
rol ; invert carry
|
|
eor #$01
|
|
ror
|
|
skip_invert:
|
|
|
|
lda FRAME
|
|
and #$3f ; wrap value to 0..63
|
|
tay
|
|
lda sinetable,Y
|
|
|
|
; center on screen $60 is midscreen
|
|
|
|
adc #$60
|
|
|
|
; ldx HGR_X ; saved in HGR_X
|
|
ldy #0 ; saved in HGR_XH
|
|
jsr HPLOT0 ; plot at (Y,X), (A)
|
|
|
|
inc FRAME
|
|
|
|
ldx HGR_X
|
|
inx ; HGR_X
|
|
|
|
bne circle_loop
|
|
|
|
beq draw_sine_loop
|
|
|
|
|
|
speaker_duration:
|
|
.res 1
|
|
speaker_frequency:
|
|
.res 1
|