mirror of
https://github.com/irmen/prog8.git
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70 lines
2.2 KiB
Lua
70 lines
2.2 KiB
Lua
%import c64utils
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%import c64lib
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%zeropage basicsafe
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~ spritedata $0a00 {
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; this memory block contains the sprite data
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; it must start on an address aligned to 64 bytes.
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%option force_output ; make sure the data in this block appears in the resulting program
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ubyte[] balloonsprite = [ %00000000,%01111111,%00000000,
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%00000001,%11111111,%11000000,
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%00000011,%11111111,%11100000,
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%00000011,%11100011,%11100000,
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%00000111,%11011100,%11110000,
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%00000111,%11011101,%11110000,
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%00000111,%11011100,%11110000,
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%00000011,%11100011,%11100000,
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%00000011,%11111111,%11100000,
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%00000011,%11111111,%11100000,
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%00000010,%11111111,%10100000,
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%00000001,%01111111,%01000000,
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%00000001,%00111110,%01000000,
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%00000000,%10011100,%10000000,
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%00000000,%10011100,%10000000,
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%00000000,%01001001,%00000000,
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%00000000,%01001001,%00000000,
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%00000000,%00111110,%00000000,
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%00000000,%00111110,%00000000,
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%00000000,%00111110,%00000000,
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%00000000,%00011100,%00000000 ]
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}
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~ main {
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sub start() {
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for ubyte i in 0 to 7 {
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c64.SPRPTR[i] = $0a00/64
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}
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c64.SPENA = 255 ; enable all sprites
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c64utils.set_rasterirq(220) ; enable animation
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}
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}
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~ irq {
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sub irq() {
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ubyte angle ; no initialization value so it keeps the previous one.
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c64.EXTCOL--
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angle++
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c64.MSIGX=0
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for ubyte @zp i in 7 to 0 step -1 {
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uword @zp x = sin8u(angle*2-i*16) as uword + 50
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ubyte @zp y = cos8u(angle*3-i*16) / 2 + 70
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c64.SPXYW[i] = mkword(lsb(x), y)
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lsl(c64.MSIGX)
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if msb(x) c64.MSIGX++
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c64.EXTCOL++
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}
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c64.EXTCOL-=7
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}
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}
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