prog8/examples/cx16/kefrenbars.p8

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%import palette
%option no_sysinit
; Vertical rasterbars a.k.a. "Kefren bars"
; also see: rasterbars.p8
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main {
sub start() {
uword[32] colors = [
$000,
$011, $112, $213, $214,
$315, $316, $417, $418,
$519, $51a, $62b, $62c,
$73d, $73e, $84f, $94f,
$93e, $83d, $82c, $72b,
$71a, $619, $618, $517,
$516, $415, $414, $313,
$312, $211, $100
]
; Not yet implemented in ROM: cx16.FB_set_palette(&colors, 0, len(colors)*3)
palette.set_rgb(&colors, len(colors))
void cx16.screen_mode(128, false) ; low-res bitmap 256 colors
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cx16.FB_init()
cx16.VERA_DC_VSCALE = 0 ; display trick spoiler.......: stretch display all the way to the bottom
cx16.set_rasterirq(&irq.irqhandler, 0)
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repeat {
; don't exit
}
}
}
irq {
uword next_irq_line = 0
ubyte anim1 = 0
ubyte av1 = 0
ubyte anim2 = 0
ubyte av2 = 0
ubyte[32] pixels = 0 to 31
const ubyte y_offset = 6
sub irqhandler() {
next_irq_line += y_offset
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anim1 += 4
anim2 += 6
if next_irq_line > 480-y_offset {
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av1++
av2 += 2
anim1 = av1
anim2 = av2
next_irq_line = 0
; erase the bars
cx16.FB_cursor_position(0, 0)
cx16.FB_fill_pixels(320, 1, 0)
} else {
; add new bar
cx16.FB_cursor_position(sin8u(anim1)/2 + cos8u(anim2)/2 + $0010, 0)
cx16.FB_set_pixels(pixels, len(pixels))
}
cx16.set_rasterline(next_irq_line)
}
}