mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-03-06 18:30:12 +00:00
104 lines
1.5 KiB
ArmAsm
104 lines
1.5 KiB
ArmAsm
; double hi-res / double lo-res
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; show dhgr image on page1
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; show sliding 32-line window of dgr page 1
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; note come in at 6 (jsr) + 6 (rts from vblank) + vblank jitter
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effect_dhgr_dgr:
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;==========================
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; top
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;==========================
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effect_top_smc: ; 12
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ldx #100 ; 2
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lda $00 ; nop3 ; 3
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nop ; 2
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nop ; 2
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jmp aloop_24 ; 3
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aloop:
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jsr delay_12 ; 12
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jsr delay_12 ; 12
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aloop_24:
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jsr delay_12 ; 12
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jsr delay_12 ; 12
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jsr delay_12 ; 12
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dex ; 2
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bne aloop ; 2/3
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;==========================
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; middle (Switch mode)
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;==========================
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; -1
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ldx #32 ; 2
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sta LORES ; 4
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sta PAGE1 ; 4
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sta SET80COL ; 4
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sta CLRAN3 ; 4
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; 17
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nop
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nop
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jmp bloop_24
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bloop:
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; update the movement mid-way
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ldy FRAME ; 3
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lda sin_table,Y ; 4+
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sta effect_top_smc+1 ; 4
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clc ; 2
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adc #32 ; should this be 31? ; 2
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sta effect_bottom_smc+1 ; 4
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;================
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; 19
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; 19
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nop
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lda $00 ; nop3
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bloop_24:
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; 24
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jsr delay_12 ; 12
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; 36
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jsr delay_12 ; 12
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; 48
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jsr delay_12 ; 12
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; 60
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dex ; 2
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bne bloop ; 2/3
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;============================================
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; bottom (Switch back to double-hires page 1)
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;============================================
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effect_bottom_smc: ; -1
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ldx #60 ; 2
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bit HIRES ; 4
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sta CLRAN3 ; 4
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sta SET80COL ; 4
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bit PAGE1 ; 4
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; 17
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nop ; 2
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nop ; 2
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jmp cloop_plus_24 ; 3
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cloop:
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jsr delay_12 ; 12
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jsr delay_12 ; 12
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cloop_plus_24:
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jsr delay_12 ; 12
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jsr delay_12 ; 12
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jsr delay_12 ; 12
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inx ; 2
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cpx #192
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bcs cloop ; 2/3
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rts
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