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softsprites.asm
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; software sprites
; by PJP
loop:
ldx $90
inx
stx $90
lda #4 ; *** NUMBER OF SPRITES
sta $3
lda #0
sta $4
multiple:
lda $90
clc
adc $4
tax
lda sinus,x
ldy cosinus,x
asl
tax
lda ypos,x
sta $00
inx
lda ypos,x
sta $01
ldx #0
lda #5 ; **** HEIGHT OF EACH SPRITE
sta $2
draw:
lda image,x
sta ($0),y
inx
iny
lda image,x
sta ($0),y
inx
iny
lda image,x
sta ($0),y
inx
iny
lda image,x
sta ($0),y
inx
iny
lda image,x
sta ($0),y
tya
clc
adc #28
tay
inx
dec $2
bne draw
lda $4
clc
adc #18 ; *** DISTANCE BETWEEN SPRITES (FROM TABLE)
sta $4
dec $3
bne multiple
jmp loop
; SINUS (AND COSINUS)
sinus:
dcb $0e, $0e, $0e, $0f, $0f, $0f, $10, $10, $10, $11
dcb $11, $11, $12, $12, $12, $13, $13, $13, $14, $14
dcb $14, $14, $15, $15, $15, $16, $16, $16, $16, $17
dcb $17, $17, $17, $18, $18, $18, $18, $19, $19, $19
dcb $19, $19, $1a, $1a, $1a, $1a, $1a, $1a, $1a, $1b
dcb $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b
dcb $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b
cosinus:
dcb $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b
dcb $1a, $1a, $1a, $1a, $1a, $1a, $19, $19, $19, $19
dcb $19, $18, $18, $18, $18, $18, $17, $17, $17, $17
dcb $16, $16, $16, $15, $15, $15, $15, $14, $14, $14
dcb $13, $13, $13, $12, $12, $12, $11, $11, $11, $10
dcb $10, $10, $0f, $0f, $0f, $0e, $0e, $0e, $0d, $0d
dcb $0d, $0c, $0c, $0c, $0b, $0b, $0b, $0a, $0a, $0a
dcb $09, $09, $09, $08, $08, $08, $07, $07, $07, $06
dcb $06, $06, $06, $05, $05, $05, $04, $04, $04, $04
dcb $03, $03, $03, $03, $03, $02, $02, $02, $02, $02
dcb $01, $01, $01, $01, $01, $01, $00, $00, $00, $00
dcb $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
dcb $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
dcb $00, $00, $00, $00, $00, $00, $00, $01, $01, $01
dcb $01, $01, $01, $01, $02, $02, $02, $02, $02, $03
dcb $03, $03, $03, $04, $04, $04, $04, $05, $05, $05
dcb $05, $06, $06, $06, $07, $07, $07, $07, $08, $08
dcb $08, $09, $09, $09, $0a, $0a, $0a, $0b, $0b, $0b
dcb $0c, $0c, $0c, $0d, $0d
dcb $0e, $0e, $0e, $0f, $0f, $0f, $10, $10, $10, $11
dcb $11, $11, $12, $12, $12, $13, $13, $13, $14, $14
dcb $14, $14, $15, $15, $15, $16, $16, $16, $16, $17
dcb $17, $17, $17, $18, $18, $18, $18, $19, $19, $19
dcb $19, $19, $1a, $1a, $1a, $1a, $1a, $1a, $1a, $1b
dcb $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b
dcb $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b
dcb $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b, $1b
dcb $1a, $1a, $1a, $1a, $1a, $1a, $19, $19, $19, $19
; 5x5 BYTES
image:
dcb $0,$0,$0,$0,$0
dcb $0,$c,$c,$c,$0
dcb $0,$c,$1,$c,$0
dcb $0,$c,$c,$c,$0
dcb $0,$0,$0,$0,$0
; YPOS LOOKUP TABLE
ypos:
dcb $00,$02,$20,$02,$40,$02,$60,$02
dcb $80,$02,$a0,$02,$c0,$02,$e0,$02
dcb $00,$03,$20,$03,$40,$03,$60,$03
dcb $80,$03,$a0,$03,$c0,$03,$e0,$03
dcb $00,$04,$20,$04,$40,$04,$60,$04
dcb $80,$04,$a0,$04,$c0,$04,$e0,$04
dcb $00,$05,$20,$05,$40,$05,$60,$05
dcb $80,$05,$a0,$05,$c0,$05,$e0,$05