mirror of https://github.com/KarolS/millfork.git
124 lines
2.4 KiB
Plaintext
124 lines
2.4 KiB
Plaintext
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import random
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array reverse_palette[256] align(256)
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#if CBM
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const byte COLUMN_COUNT = 40
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const byte ROW_COUNT = 25
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array palette align(fast) = [black, red, orange, yellow, white]
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void cls() {
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byte i
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for i,0,paralleluntil,250 {
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screen[000+i] = 160
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screen[250+i] = 160
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screen[500+i] = 160
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screen[750+i] = 160
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}
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for i,0,paralleluntil,250 {
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colors[000+i] = black
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colors[250+i] = black
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colors[500+i] = black
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colors[750+i] = black
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}
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}
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#endif
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#if CBM_64
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array colors[1000] @$d800
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array screen[1000] @$400
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#elseif CBM_264
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array colors[1000] @$800
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array screen[1000] @$c00
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#endif
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#if ZX_SPECTRUM
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#pragma zilog_syntax
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array palette align(fast) = [black*9, red*9, red*9+$40, yellow*9+$40, white*9+$40]
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array colors[$300] @$5800
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const byte COLUMN_COUNT = 32
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const byte ROW_COUNT = 24
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void cls() {
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pointer p
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for p,$4000,paralleluntil,$5800 {
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p[0] = $f7
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}
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for p,$5800,paralleluntil,$5b00 {
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p[0] = black*9
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}
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}
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#endif
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void build_reverse_palette () {
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byte i
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#if CBM_64
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byte j
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for i,0,paralleluntil,palette.length {
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for j,0,parallelto,$f {
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reverse_palette[palette[i] | (j<<4)] = i
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}
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}
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#else
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for i,0,paralleluntil,palette.length {
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reverse_palette[palette[i]] = i
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}
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#endif
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}
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void main() {
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set_border(black)
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init_rand_seed()
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build_reverse_palette()
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cls()
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byte i
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const word LAST_ROW_START = COLUMN_COUNT * word(ROW_COUNT-1)
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for i,0,paralleluntil,COLUMN_COUNT {
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colors[LAST_ROW_START+i] = palette[palette.length - 1]
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}
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while true {
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wait_frame()
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fire()
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}
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}
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void wait_frame() {
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#if CBM_64
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while vic_raster != $ff {}
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#elseif CBM_264
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while ted_raster_y != $ff {}
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#elseif ZX_SPECTRUM
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asm { halt }
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#else
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// TODO
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#endif
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}
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void fire() {
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byte noise
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byte row
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byte column
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pointer p
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byte heat
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byte entropy
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entropy = 0
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p = colors.addr
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for row,0,paralleluntil,ROW_COUNT-1 {
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for column,0,paralleluntil,COLUMN_COUNT {
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if entropy == 0 {
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noise = rand()
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entropy = 8
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}
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heat = reverse_palette[p[column+COLUMN_COUNT]]
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if noise & 1 != 0 {
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if heat != 0 { heat -= 1 }
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}
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noise >>= 1
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entropy -= 1
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p[column] = palette[heat]
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}
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p += COLUMN_COUNT
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}
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}
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