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https://github.com/irmen/prog8.git
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262 lines
8.8 KiB
Lua
262 lines
8.8 KiB
Lua
; Manipulate the Commander X16's display color palette.
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; Should you want to restore the full default palette, you can call cbm.CINT()
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; The first 16 colors can be restored to their default with set_default16()
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palette {
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%option ignore_unused
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uword vera_palette_ptr
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sub set_color(ubyte index, uword color) {
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vera_palette_ptr = $fa00+(index as uword * 2)
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cx16.vpoke(1, vera_palette_ptr, lsb(color))
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vera_palette_ptr++
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cx16.vpoke(1, vera_palette_ptr, msb(color))
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}
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sub get_color(ubyte index) -> uword {
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vera_palette_ptr = $fa00+(index as uword * 2)
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return mkword(cx16.vpeek(1, vera_palette_ptr+1), cx16.vpeek(1, vera_palette_ptr))
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}
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sub set_rgb_be(uword palette_ptr, uword num_colors) {
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; 1 word per color entry, $0rgb in big endian format
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vera_palette_ptr = $fa00
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repeat num_colors {
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cx16.vpoke(1, vera_palette_ptr+1, @(palette_ptr))
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palette_ptr++
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cx16.vpoke(1, vera_palette_ptr, @(palette_ptr))
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palette_ptr++
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vera_palette_ptr+=2
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}
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}
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sub set_rgb(uword palette_words_ptr, uword num_colors) {
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; 1 word per color entry (in little endian format as layed out in video memory, so $gb;$0r)
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vera_palette_ptr = $fa00
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repeat num_colors*2 {
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cx16.vpoke(1, vera_palette_ptr, @(palette_words_ptr))
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palette_words_ptr++
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vera_palette_ptr++
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}
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}
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sub set_rgb8(uword palette_bytes_ptr, uword num_colors) {
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; 3 bytes per color entry, adjust color depth from 8 to 4 bits per channel.
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vera_palette_ptr = $fa00
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ubyte red
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ubyte greenblue
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repeat num_colors {
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cx16.r1 = color8to4(palette_bytes_ptr)
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palette_bytes_ptr+=3
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cx16.vpoke(1, vera_palette_ptr, cx16.r1H) ; $GB
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vera_palette_ptr++
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cx16.vpoke(1, vera_palette_ptr, cx16.r1L) ; $0R
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vera_palette_ptr++
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}
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}
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sub color8to4(uword colorpointer) -> uword {
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; accurately convert 24 bits (3 bytes) RGB color, in that order in memory, to 16 bits $GB;$0R colorvalue
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cx16.r1 = colorpointer
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cx16.r0 = channel8to4(@(cx16.r1)) ; (red) -> $00:0R
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cx16.r0H = channel8to4(@(cx16.r1+1))<<4 ; (green) -> $G0:0R
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cx16.r0H |= channel8to4(@(cx16.r1+2)) ; (blue) -> $GB:0R
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return cx16.r0
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}
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sub channel8to4(ubyte channelvalue) -> ubyte {
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; accurately convert a single 8 bit color channel value to 4 bits, see https://threadlocalmutex.com/?p=48
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return msb(channelvalue * $000f + 135)
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}
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sub set_monochrome(uword screencolorRGB, uword drawcolorRGB) {
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vera_palette_ptr = $fa00
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cx16.vpoke(1, vera_palette_ptr, lsb(screencolorRGB)) ; G,B
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vera_palette_ptr++
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cx16.vpoke(1, vera_palette_ptr, msb(screencolorRGB)) ; R
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vera_palette_ptr++
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repeat 255 {
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cx16.vpoke(1, vera_palette_ptr, lsb(drawcolorRGB)) ; G,B
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vera_palette_ptr++
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cx16.vpoke(1, vera_palette_ptr, msb(drawcolorRGB)) ; R
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vera_palette_ptr++
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}
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}
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sub set_all_black() {
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set_monochrome($000, $000)
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}
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sub set_all_white() {
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set_monochrome($fff, $fff)
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}
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sub set_grayscale() {
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; set first 16 colors to a grayscale gradient from black to white
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vera_palette_ptr = $fa00
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cx16.r2L=0
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repeat 16 {
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cx16.vpoke(1, vera_palette_ptr, cx16.r2L)
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vera_palette_ptr++
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cx16.vpoke(1, vera_palette_ptr, cx16.r2L)
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vera_palette_ptr++
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cx16.r2L += $11
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}
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}
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sub fade_step_multi(ubyte startindex, ubyte endindex, uword target_rgb) -> bool {
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; Perform one color fade step for multiple consecutive palette entries.
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; startindex = palette index of first color to fade
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; endindex = palette index of last color to fade
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; target_rgb = $RGB color value to fade towards
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; Returns true if one or more colors were changed, false if no fade steps were done anymore.
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; So you usually keep calling this until it returns false.
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bool changed = false
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while startindex <= endindex {
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if fade_step(startindex, target_rgb)
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changed=true
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startindex++
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if_z
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break
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}
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return changed
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}
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sub fade_step_colors(ubyte startindex, ubyte endindex, uword target_colors) -> bool {
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; Perform one color fade step for multiple consecutive palette entries, to different target colors.
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; startindex = palette index of first color to fade
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; endindex = palette index of last color to fade
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; target_colors = address of uword $RGB array of colors to fade towards
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; Returns true if one or more colors were changed, false if no fade steps were done anymore.
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; So you usually keep calling this until it returns false.
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bool changed = false
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ubyte target_index = 0
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while startindex <= endindex {
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if fade_step(startindex, peekw(target_colors+target_index))
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changed=true
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target_index += 2
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startindex++
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if_z
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break
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}
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return changed
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}
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sub fade_step(ubyte index, uword target_rgb) -> bool {
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; Perform one color fade step for a single palette entry.
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; index = palette index of the color to fade
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; target_rgb = $RGB color value to fade towards
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; Returns true if the color was changed, false if no fade step was done anymore.
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; So you usually keep calling this until it returns false.
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uword color = palette.get_color(index)
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cx16.r0L = msb(color) ; r
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cx16.r1L = lsb(color) >> 4 ; g
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cx16.r2L = lsb(color) & 15 ; b
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cx16.r0H = msb(target_rgb) & 15 ; r2
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cx16.r1H = lsb(target_rgb) >> 4 ; g2
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cx16.r2H = lsb(target_rgb) & 15 ; b2
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ubyte changed
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; use cmp() + status bits branches, to avoid multiple compares that could be done just once
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cmp(cx16.r0L, cx16.r0H)
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if_ne {
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if_cc
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cx16.r0L++
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else
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cx16.r0L--
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changed++
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}
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cmp(cx16.r1L, cx16.r1H)
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if_ne {
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if_cc
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cx16.r1L++
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else
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cx16.r1L--
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changed++
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}
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cmp(cx16.r2L, cx16.r2H)
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if_ne {
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if_cc
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cx16.r2L++
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else
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cx16.r2L--
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changed++
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}
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palette.set_color(index, mkword(cx16.r0L, cx16.r1L<<4 | cx16.r2L))
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return changed!=0
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}
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sub set_c64pepto() {
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; set first 16 colors to the "Pepto" PAL commodore-64 palette http://www.pepto.de/projects/colorvic/
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uword[] colors = [
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$000, ; 0 = black
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$FFF, ; 1 = white
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$833, ; 2 = red
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$7cc, ; 3 = cyan
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$839, ; 4 = purple
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$5a4, ; 5 = green
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$229, ; 6 = blue
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$ef7, ; 7 = yellow
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$852, ; 8 = orange
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$530, ; 9 = brown
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$c67, ; 10 = light red
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$444, ; 11 = dark grey
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$777, ; 12 = medium grey
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$af9, ; 13 = light green
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$76e, ; 14 = light blue
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$bbb ; 15 = light grey
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]
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set_rgb(colors, len(colors))
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}
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sub set_c64ntsc() {
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; set first 16 colors to a NTSC commodore-64 palette
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uword[] colors = [
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$000, ; 0 = black
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$FFF, ; 1 = white
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$934, ; 2 = red
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$9ff, ; 3 = cyan
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$73f, ; 4 = purple
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$4b1, ; 5 = green
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$20c, ; 6 = blue
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$ee6, ; 7 = yellow
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$b53, ; 8 = orange
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$830, ; 9 = brown
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$f8a, ; 10 = light red
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$444, ; 11 = dark grey
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$999, ; 12 = medium grey
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$9f9, ; 13 = light green
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$36f, ; 14 = light blue
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$ccc ; 15 = light grey
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]
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set_rgb(colors, len(colors))
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}
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sub set_default16() {
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; set first 16 colors to the defaults on the X16
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uword[] colors = [
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$000, ; 0 = black
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$fff, ; 1 = white
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$800, ; 2 = red
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$afe, ; 3 = cyan
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$c4c, ; 4 = purple
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$0c5, ; 5 = green
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$00a, ; 6 = blue
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$ee7, ; 7 = yellow
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$d85, ; 8 = orange
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$640, ; 9 = brown
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$f77, ; 10 = light red
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$333, ; 11 = dark grey
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$777, ; 12 = medium grey
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$af6, ; 13 = light green
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$08f, ; 14 = light blue
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$bbb ; 15 = light grey
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]
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set_rgb(colors, len(colors))
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}
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}
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