mirror of
https://github.com/irmen/prog8.git
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67 lines
2.4 KiB
Lua
67 lines
2.4 KiB
Lua
%import syslib
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%import math
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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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ubyte i
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for i in 0 to 7 {
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c64.set_sprite_ptr(i, $0a00) ; alternatively, set directly: c64.SPRPTR[i] = $0a00 / 64
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}
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c64.SPENA = 255 ; enable all sprites
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sys.set_rasterirq(&irq.irqhandler, 230) ; enable animation
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}
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}
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irq {
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ubyte angle1=200
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ubyte angle2=0
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sub irqhandler() -> bool {
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angle1 += 2
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angle2 += 3
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c64.MSIGX=0
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ubyte @zp spri
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for spri in 7 downto 0 {
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c64.EXTCOL++
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uword @zp x = math.sin8u(angle1-spri*16) as uword + 50
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ubyte @zp y = math.sin8u(angle2-spri*16) / 2 + 70
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c64.SPXYW[spri] = mkword(y, lsb(x))
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c64.MSIGX <<= 1
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if msb(x)!=0 c64.MSIGX++
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}
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c64.EXTCOL-=8
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return true
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}
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}
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