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https://github.com/irmen/prog8.git
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40 lines
923 B
Lua
40 lines
923 B
Lua
%import c64utils
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%import c64lib
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main {
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sub start() {
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c64.SCROLY &= %11101111 ; blank the screen
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c64utils.set_rasterirq_excl(40) ; register exclusive raster irq handler
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forever {
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; enjoy the moving bars :)
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}
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}
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}
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irq {
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const ubyte barheight = 4 ; should be big enough to re-trigger the Raster irq properly.
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ubyte[] colors = [6,2,4,5,15,7,1,13,3,12,8,11,9]
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ubyte color = 0
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ubyte yanim = 0
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sub irq() {
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if color!=len(colors) {
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c64.EXTCOL = colors[color]
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c64.RASTER += barheight ; next raster Irq for next color
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color++
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}
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else {
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c64.EXTCOL = 0
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color = 0
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yanim += 2
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c64.RASTER = sin8u(yanim)/2+30 ; new start of raster Irq
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}
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c64.SCROLY &= $7f ; set high bit of the raster pos to zero
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}
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}
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