117 lines
1.9 KiB
ArmAsm
117 lines
1.9 KiB
ArmAsm
; Moving
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; moving, orange and green
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; this is plotting
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; sin(y/4-FRAME) + sin(x) + sin(x+frame)
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; or at least I think so. Comment your code!
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;================================
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; Clear screen and setup graphics
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;================================
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moving:
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lda #0
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sta FRAME
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;============================
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; main loop
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;============================
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draw_moving:
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inc FRAME
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moving_size_smc:
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lda #191 ; YY
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create_yloop:
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; HGR_Y (YY) is in A here
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; ldx #39 ; X is don't care?
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; ldy #0 ; Y is also don't care?
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jsr HPOSN ; (Y,X),(A) (values stores in HGRX,XH,Y)
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; restore values
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lda HGR_Y ; YY in X
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tax
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calcsine_div4:
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lsr ; YY/4
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lsr ; 2
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sec
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sbc FRAME ; YY/4-FRAME
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tay
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lda sinetable,y ; A=SIN(YY/4-FRAME)
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sta row_sum_smc+1
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; ldx HGR_Y ; YY
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ldy #39 ; XX
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create_xloop:
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;=====================
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; critical inner loop
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; every cycle here is 40x192 cycles
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;=====================
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clc
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tya ; XX
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adc FRAME ; XX+FRAME
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tax
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lda sinetable,X ; SIN(XX+FRAME)
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adc sinetable,Y ; SIN(XX)+SIN(XX+FRAME) ; 4+
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row_sum_smc:
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adc #$dd ; row base value ; 2
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; this is SIN(YY/4-FRAME)
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lsr ; double colors ; 2
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; also puts bit in carry
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; which helps proper color gen
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and #$7 ; 2
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tax ; 2
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colorlookup_smc:
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lda colorlookup,X ; lookup in table ; 5
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ror_nop_smc:
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ror ; $6A/$EA ; 2
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sta (GBASL),Y ; 6
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lda ror_nop_smc ; toggle ror/nop ; 4
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eor #$80 ; 2
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sta ror_nop_smc ; 4
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dey ; 2
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bpl create_xloop ; 2/3
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dec HGR_Y
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lda HGR_Y
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cmp #$ff ; blah want to draw line 0
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bne create_yloop
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jsr flip_page
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lda FRAME
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cmp #$1b ; NOTE: NEEDS TO BE ODD
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bne draw_moving ; bra
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; rts
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;colorlookup:
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;.byte $22,$aa,$ba,$ff,$ba,$aa,$22 ; use 00 from sinetable
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;;.byte $00
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;;.byte $11,$55,$5d,$7f,$5d,$55,$11 ; use 00 from sinetable
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;;.byte $00
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;sinetable_base:
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;; this is actually (32*sin(x))
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;.byte $00,$03,$06,$09,$0C,$0F,$11,$14
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;.byte $16,$18,$1A,$1C,$1D,$1E,$1F,$1F
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;.byte $20
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;sinetable=$8000
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