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82 lines
1.8 KiB
ArmAsm
82 lines
1.8 KiB
ArmAsm
; Bitmap test
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; by Vince `deater` Weaver <vince@deater.net>
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; eye image by (TODO) from lovebyte 16x16 compo
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; 291 -- initial code
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; 183 -- draw top/bottom nibble
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; 182 -- end loop branch not jmp
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; 179 -- make YPOS in memory
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; 178 -- move end handling around
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; 175 -- use SCRN2
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; 171 -- alternate carry
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; 168 -- realize SETCOL leaves result in A
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.include "zp.inc"
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.include "hardware.inc"
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;================================
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; Clear screen and setup graphics
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;================================
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eye:
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jsr SETGR ; set lo-res 40x40 mode
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; A=$D0 afterward
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ldx #$ff ; beginning of data
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draw_eye_yloop:
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ypos_smc:
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lda #4 ; YPOS
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; take Y-coord/2 in A, put address in GBASL/H ( a trashed, C clear)
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jsr GBASCALC
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ldy #12
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draw_eye_xloop:
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; draw bottom nibble first
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tya
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ror ; get odd or even in carry
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bcs plot_it ; only increment X every other
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inx
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end:
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bmi end ; if X hits 128, done
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plot_it:
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lda eye_data,X ; get color
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jsr SCRN2 ; put top or bottom nibble in A based on C
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jsr SETCOL ; duplicate color in top/bottom
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sta (GBASL),Y ; plot double high color
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iny
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cpy #28
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bne draw_eye_xloop
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inc ypos_smc+1
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bne draw_eye_yloop ; branch always
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eye_data:
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.byte $BB,$88,$BB,$0B,$08,$88,$80,$B0
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.byte $8B,$B8,$0B,$08,$00,$00,$00,$00
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.byte $88,$0B,$08,$00,$00,$00,$00,$00
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.byte $B8,$08,$00,$00,$44,$04,$00,$00
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.byte $8B,$00,$40,$44,$F7,$7F,$04,$00
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.byte $08,$40,$4C,$00,$75,$FF,$47,$70
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.byte $00,$C4,$04,$00,$50,$F7,$4F,$70
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.byte $00,$44,$0C,$00,$00,$F7,$4F,$F0
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.byte $07,$C4,$04,$00,$00,$75,$47,$F0
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.byte $0F,$44,$0C,$00,$00,$40,$44,$F0
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.byte $7F,$40,$4C,$00,$00,$C4,$04,$F7
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.byte $FF,$40,$C4,$4C,$4C,$4C,$04,$FF
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.byte $F7,$07,$44,$C4,$C4,$44,$70,$FF
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.byte $78,$7F,$00,$44,$44,$00,$F7,$7F
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.byte $8B,$87,$7F,$00,$00,$F7,$7F,$88
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.byte $BB,$8B,$88,$88,$88,$88,$88,$BB
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