mirror of
https://github.com/irmen/prog8.git
synced 2024-06-13 09:29:34 +00:00
08ac459a41
When it returns true it means run the system IRQ handler afterwards. When it returns false, the system handler is NOT ran afterwards.
75 lines
2.4 KiB
Lua
75 lines
2.4 KiB
Lua
%import textio
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%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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txt.print("balloon sprites!\n...we are all floating...\n")
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ubyte @zp 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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c64.SPXY[i*2] = 50+25*i
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c64.SPXY[i*2+1] = math.rnd()
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}
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c64.SPENA = 255 ; enable all sprites
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sys.set_rasterirq(&irq.irqhandler, 255) ; enable animation
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}
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}
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irq {
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sub irqhandler() -> bool {
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c64.EXTCOL--
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; float up & wobble horizontally
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ubyte @zp i
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for i in 0 to 14 step 2 {
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c64.SPXY[i+1]--
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ubyte @zp r = math.rnd()
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if r>200
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c64.SPXY[i]++
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else if r<40
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c64.SPXY[i]--
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}
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c64.EXTCOL++
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return true
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}
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}
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