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68 lines
1.6 KiB
Lua
68 lines
1.6 KiB
Lua
%import palette
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%import math
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%import gfx2
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%option no_sysinit
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; Vertical rasterbars a.k.a. "Kefren bars"
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; also see: rasterbars.p8
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main {
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sub start() {
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uword[32] colors = [
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$000,
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$011, $112, $213, $214,
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$315, $316, $417, $418,
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$519, $51a, $62b, $62c,
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$73d, $73e, $84f, $94f,
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$93e, $83d, $82c, $72b,
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$71a, $619, $618, $517,
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$516, $415, $414, $313,
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$312, $211, $100
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]
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palette.set_rgb(&colors, len(colors))
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gfx2.screen_mode(1) ; lores 256 colors
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cx16.VERA_DC_VSCALE = 0 ; display trick spoiler.......: stretch 1 line of display all the way to the bottom
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cx16.enable_irq_handlers(true)
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cx16.set_line_irq_handler(0, &irq.irqhandler)
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repeat {
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; don't exit
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}
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}
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}
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irq {
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const ubyte BAR_Y_OFFSET = 6
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uword next_irq_line = 0
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ubyte anim1 = 0
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ubyte av1 = 0
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ubyte anim2 = 0
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ubyte av2 = 0
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ubyte[32] pixels = 0 to 31
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sub irqhandler() -> bool {
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next_irq_line += BAR_Y_OFFSET
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anim1 += 7
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anim2 += 4
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if next_irq_line > 480-BAR_Y_OFFSET {
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av1++
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av2 += 2
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anim1 = av1
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anim2 = av2
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next_irq_line = 0
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; erase the bars
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gfx2.horizontal_line(0, 0, 320, 3)
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} else {
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; add new bar on top
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gfx2.position(math.sin8u(anim1)/2 + math.cos8u(anim2)/2 + $0010, 0)
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gfx2.next_pixels(pixels, len(pixels))
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}
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sys.set_rasterline(next_irq_line)
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return false
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}
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}
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