prog8/examples/wizzine.p8

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%import c64utils
%import c64lib
%zeropage basicsafe
~ spritedata $0a00 {
; this memory block contains the sprite data
; it must start on an address aligned to 64 bytes.
%option force_output ; make sure the data in this block appears in the resulting program
ubyte[63] balloonsprite = [ %00000000,%01111111,%00000000,
%00000001,%11111111,%11000000,
%00000011,%11111111,%11100000,
%00000011,%11100011,%11100000,
%00000111,%11011100,%11110000,
%00000111,%11011101,%11110000,
%00000111,%11011100,%11110000,
%00000011,%11100011,%11100000,
%00000011,%11111111,%11100000,
%00000011,%11111111,%11100000,
%00000010,%11111111,%10100000,
%00000001,%01111111,%01000000,
%00000001,%00111110,%01000000,
%00000000,%10011100,%10000000,
%00000000,%10011100,%10000000,
%00000000,%01001001,%00000000,
%00000000,%01001001,%00000000,
%00000000,%00111110,%00000000,
%00000000,%00111110,%00000000,
%00000000,%00111110,%00000000,
%00000000,%00011100,%00000000 ]
}
~ main {
sub start() {
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for ubyte i in 0 to 7 {
c64.SPRPTR[i] = $0a00/64
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}
c64.SPENA = 255 ; enable all sprites
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c64utils.set_rasterirq(220) ; enable animation
}
}
~ irq {
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sub irq() {
ubyte angle ; no initialization value so it keeps the previous one.
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c64.EXTCOL--
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angle++
c64.MSIGX=0
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for ubyte @zp i in 7 to 0 step -1 {
uword @zp x = sin8u(angle*2-i*16) as uword + 50
ubyte @zp y = cos8u(angle*3-i*16) / 2 + 70
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c64.SPXYW[i] = mkword(lsb(x), y)
lsl(c64.MSIGX)
if msb(x) c64.MSIGX++
c64.EXTCOL++
}
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c64.EXTCOL-=7
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}
}