mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-08 15:29:41 +00:00
123 lines
1.9 KiB
ArmAsm
123 lines
1.9 KiB
ArmAsm
; Moving
|
|
; moving, orange and green
|
|
|
|
;================================
|
|
; Clear screen and setup graphics
|
|
;================================
|
|
moving:
|
|
lda #0
|
|
sta FRAME
|
|
|
|
;============================
|
|
; main loop
|
|
;============================
|
|
|
|
draw_moving:
|
|
inc FRAME
|
|
|
|
lda #191 ; YY
|
|
|
|
create_yloop:
|
|
; HGR_Y (YY) is in A here
|
|
|
|
; ldx #39 ; X is don't care?
|
|
; ldy #0 ; Y is also don't care?
|
|
|
|
jsr HPOSN ; (Y,X),(A) (values stores in HGRX,XH,Y)
|
|
|
|
; restore values
|
|
|
|
lda HGR_Y ; YY
|
|
tax
|
|
|
|
calcsine_div4:
|
|
lsr
|
|
lsr ; 2
|
|
sec
|
|
sbc FRAME
|
|
tay
|
|
lda sinetable,y
|
|
sta row_sum_smc+1
|
|
|
|
; ldx HGR_Y ; YY
|
|
|
|
ldy #39 ; XX
|
|
create_xloop:
|
|
|
|
;=====================
|
|
; critical inner loop
|
|
; every cycle here is 40x192 cycles
|
|
;=====================
|
|
|
|
clc
|
|
tya
|
|
adc FRAME
|
|
tax
|
|
lda sinetable,X
|
|
|
|
adc sinetable,Y ; 4+
|
|
row_sum_smc:
|
|
adc #$dd ; row base value ; 2
|
|
|
|
lsr ; double colors ; 2
|
|
; also puts bit in carry
|
|
; which helps proper color gen
|
|
and #$7 ; 2
|
|
tax ; 2
|
|
lda colorlookup,X ; lookup in table ; 5
|
|
|
|
ror_nop_smc:
|
|
ror ; $6A/$EA ; 2
|
|
sta (GBASL),Y ; 6
|
|
|
|
lda ror_nop_smc ; toggle ror/nop ; 4
|
|
eor #$80 ; 2
|
|
sta ror_nop_smc ; 4
|
|
|
|
dey ; 2
|
|
bpl create_xloop ; 2/3
|
|
|
|
dec HGR_Y
|
|
lda HGR_Y
|
|
cmp #$ff ; blah want to draw line 0
|
|
bne create_yloop
|
|
|
|
jsr flip_page
|
|
|
|
;flip_pages:
|
|
|
|
; Y should be $FF here
|
|
|
|
; lda HGR_PAGE ; will be $20/$40
|
|
; cmp #$20
|
|
; bne done_page
|
|
; dey
|
|
;done_page:
|
|
; ldx PAGE1-$FE,Y ; set display page to PAGE1 or PAGE2
|
|
|
|
; eor #$60 ; flip draw page between $2000/$4000
|
|
; sta HGR_PAGE
|
|
|
|
lda FRAME
|
|
cmp #$1f
|
|
bne draw_moving ; bra
|
|
|
|
rts
|
|
|
|
colorlookup:
|
|
.byte $22,$aa,$ba,$ff,$ba,$aa,$22 ; use 00 from sinetable
|
|
;.byte $00
|
|
|
|
;.byte $11,$55,$5d,$7f,$5d,$55,$11 ; use 00 from sinetable
|
|
;.byte $00
|
|
|
|
sinetable_base:
|
|
; this is actually (32*sin(x))
|
|
.byte $00,$03,$06,$09,$0C,$0F,$11,$14
|
|
.byte $16,$18,$1A,$1C,$1D,$1E,$1F,$1F
|
|
.byte $20
|
|
|
|
sinetable=$8000
|
|
|
|
|