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https://github.com/irmen/prog8.git
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70 lines
1.7 KiB
Lua
70 lines
1.7 KiB
Lua
%import palette
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%import math
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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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; Not yet implemented in ROM: cx16.FB_set_palette(&colors, 0, len(colors)*3)
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palette.set_rgb(&colors, len(colors))
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void cx16.screen_mode(128, false) ; low-res bitmap 256 colors
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cx16.FB_init()
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cx16.VERA_DC_VSCALE = 0 ; display trick spoiler.......: stretch display all the way to the bottom
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cx16.set_rasterirq(&irq.irqhandler, 0)
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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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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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const ubyte y_offset = 6
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sub irqhandler() {
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next_irq_line += y_offset
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anim1 += 4
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anim2 += 6
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if next_irq_line > 480-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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cx16.FB_cursor_position(0, 0)
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cx16.FB_fill_pixels(320, 1, 0)
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} else {
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; add new bar
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cx16.FB_cursor_position(math.sin8u(anim1)/2 + math.cos8u(anim2)/2 + $0010, 0)
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cx16.FB_set_pixels(pixels, len(pixels))
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}
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cx16.set_rasterline(next_irq_line)
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}
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}
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