mirror of
https://github.com/irmen/prog8.git
synced 2024-12-24 16:29:21 +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.
41 lines
973 B
Lua
41 lines
973 B
Lua
%import syslib
|
|
%import math
|
|
|
|
main {
|
|
|
|
sub start() {
|
|
c64.SCROLY &= %11101111 ; blank the screen
|
|
sys.set_rasterirq(&irq.irqhandler, 40) ; register exclusive raster irq handler
|
|
|
|
repeat {
|
|
; enjoy the moving bars :)
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
|
|
irq {
|
|
|
|
const ubyte barheight = 3 ; should be big enough to re-trigger the Raster irq properly.
|
|
ubyte[] colors = [6,2,4,5,15,7,1,13,3,12,8,11,9]
|
|
ubyte color = 0
|
|
ubyte yanim = 0
|
|
|
|
sub irqhandler() -> bool {
|
|
if color!=len(colors) {
|
|
c64.EXTCOL = colors[color]
|
|
c64.RASTER += barheight ; next raster Irq for next color
|
|
color++
|
|
}
|
|
else {
|
|
c64.EXTCOL = 0
|
|
color = 0
|
|
yanim += 2
|
|
c64.RASTER = math.sin8u(yanim)/2+30 ; new start of raster Irq
|
|
}
|
|
c64.SCROLY &= $7f ; set high bit of the raster pos to zero
|
|
return false
|
|
}
|
|
}
|