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bc3f2db3de
Revert palette.default_colors_16[] back to palette.set_default16.colors.
178 lines
5.8 KiB
Lua
178 lines
5.8 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 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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