mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-18 19:29:30 +00:00
133 lines
1.4 KiB
ArmAsm
133 lines
1.4 KiB
ArmAsm
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shimmer:
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;=========================================
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; SETUP
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;=========================================
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jsr HGR
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bit FULLGR
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ldx #88
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jsr long_wait
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lda #0
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sta FRAME
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lda #14
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sta YPOS
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lda #3
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sta HGR_SCALE
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lda #32
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sta DIRECTION
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lda #22 ; only set once, we wrap
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sta XPOS
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y_loop:
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x_loop:
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main_loop:
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;=======================
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; xdraw
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;=======================
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xdraw:
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; setup X and Y co-ords
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ldy #0 ; XPOSH always 0 for us
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ldx XPOS
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lda YPOS
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jsr HPOSN ; X= (y,x) Y=(a)
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ldx #<shape_dsr
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ldy #>shape_dsr
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lda #0 ; set rotation
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jsr XDRAW0 ; XDRAW 1 AT X,Y
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; Both A and X are 0 at exit
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inc FRAME
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lda FRAME
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and #$7
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beq reverse
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add_x:
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lda XPOS
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clc
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adc DIRECTION
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sta XPOS
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jmp x_loop
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reverse:
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ldx #26 ; 26 is close
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jsr long_wait
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lda DIRECTION ; switch direction
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eor #$ff
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sec
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adc #0
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sta DIRECTION
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lda YPOS
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clc
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adc #16
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sta YPOS
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cmp #190
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bne y_loop
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;=====================================
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; shimmer
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;=====================================
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do_shimmer:
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lda #12
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sta FRAME
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do_shimmer_y:
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ldx #0
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do_shimmer_x:
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blargh:
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lda $2000,X
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eor #$80
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blargh2:
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sta $2000,X
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inx
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bne do_shimmer_x
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inc blargh+2
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inc blargh2+2
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lda blargh+2
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cmp #$40
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bne do_shimmer_y
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lda #$20
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sta blargh+2
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sta blargh2+2
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dec FRAME
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bne do_shimmer_y
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rts
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shape_dsr:
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.byte $2d,$36,$ff,$3f
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.byte $24,$ad,$22,$24,$94,$21,$2c,$4d
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.byte $91,$3f,$36,$00
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