mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-16 23:20:43 +00:00
119 lines
1.6 KiB
ArmAsm
119 lines
1.6 KiB
ArmAsm
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HGR_SHAPE = $1A
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HGR_SHAPEH = $1B
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HGR_HPAGE = $E6
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HGR_SCALE = $E7
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OFFSET = $FE
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HGR_ROTATE = $FF
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KEYPRESS = $C000
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KEYRESET = $C010
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HGR = $F3E2
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HCLR = $F3F2
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HPOSN = $F411
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HPLOT0 = $F457
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HGLIN = $F53A
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XDRAW = $F65D
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XDRAW1 = $F661
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COLORTBL = $F6F6
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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start:
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;==========================
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; Setup Graphics
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;==========================
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; We can't use HGR as it clears the screen
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jsr HGR
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;======================
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; Setup vars
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;======================
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lda #1
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sta HGR_SCALE
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sta HGR_ROTATE
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; HFNS puts X-coord in Y,X, Y-coord in A
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; HPOSN sets up GBASL/GBASH
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loop:
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ldy #0 ; high byte of x position
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ldx #140 ; low byte of x position
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lda #96 ; y position
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jsr HPOSN
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ldx #<portal_vert
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ldy #>portal_vert
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jsr random_byte
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; lda HGR_ROTATE ; rotation
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jsr XDRAW
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; jsr wait_until_keypress
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jsr random_byte
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; lda #200
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jsr WAIT
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jsr random_byte
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ora #$1
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and #$3
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sta HGR_SCALE
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; lda HGR_SCALE
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; eor #$2
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; sta HGR_SCALE
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; inc HGR_ROTATE
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bit $C030
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jmp loop
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; Shape 1
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;
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; "Portal"
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; #
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; # #
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; # #
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; # #
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; # #
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; # #
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; # * #
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; # #
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; # #
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; # #
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; # #
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; # #
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; #
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;
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; START
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; NLT NLT UP UP UP NRT UP UP UP NRT RT NDN
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; DN DN DN NRT DN DN DN DN DN NLT DN DN DN NLT
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; UP NLT UP UP UP NLT UP UP UP
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; STOP
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portal_vert:
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.byte $1b,$24,$0c,$24,$0c,$15,$36,$0e,$36, $36,$1e,$36,$1e,$1c,$24,$1c,$24
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.byte $04,$00
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random_byte:
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inc OFFSET
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lda OFFSET
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and #$1f
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tay
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lda start,Y
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rts
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wait_until_keypress:
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lda KEYPRESS
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bpl wait_until_keypress
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lda KEYRESET ; clear strobe
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rts
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