mirror of
https://github.com/KarolS/millfork.git
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144 lines
2.9 KiB
Plaintext
144 lines
2.9 KiB
Plaintext
#if CBM_64
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const byte width = 40
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const byte height = 25
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#endif
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#if ZX_SPECTRUM
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const byte width = 32
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const byte height = 24
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#endif
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const word area = word(width) * word(height)
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// representation: $1 live now $80 live soon
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const byte ALIVE = $81
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array buffer [width * height] align(256)
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void init_buffer() {
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pointer p
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for p,buffer.addr,paralleluntil,buffer.addr+area {
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p[0] = 0
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}
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// glider:
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buffer[1*width + 2] = ALIVE
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buffer[2*width + 3] = ALIVE
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buffer[3*width + 1] = ALIVE
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buffer[3*width + 2] = ALIVE
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buffer[3*width + 3] = ALIVE
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}
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void do_round() align(fast) {
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byte x, y, sum, j
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pointer p
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p = buffer.addr - width - 1
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for y,0,until,height {
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for x,0,until,width {
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sum = 0
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if y != 0 {
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if x != 0 { sum += p[0] }
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sum += p[1]
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if x != width - 1 { sum += p[2] }
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}
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if true {
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if x != 0 { sum += p[width] }
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if x != width - 1 { sum += p[width + 2] }
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}
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if y != height - 1 {
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if x != 0 { sum += p[2 * width] }
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sum += p[2 * width + 1]
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if x != width - 1 { sum += p[2 * width + 2] }
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}
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sum &= $7f
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if sum == 3 {
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p[width + 1] |= $80
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} else if sum != 2 {
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p[width + 1] &= $7f
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}
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p += 1
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}
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}
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p = buffer.addr
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for j,0,paralleluntil,height {
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for x,0,paralleluntil,width {
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if p[x] & $80 != 0 { p[x] = $81 }
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else { p[x] = 0 }
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}
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p += width
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}
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}
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#if CBM_64
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void init_gfx() {
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byte i
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for i,0,paralleluntil,250 {
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c64_color_ram[i+000]=light_blue
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c64_color_ram[i+250]=light_blue
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c64_color_ram[i+500]=light_blue
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c64_color_ram[i+750]=light_blue
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}
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}
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void redraw() align(fast) {
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pointer src, dest
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byte x, y
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src = buffer.addr
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dest = $400
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for y,0,until,height {
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for x,0,until,width {
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if src[x] != 0 {
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dest[x] = 128 + ' '
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} else {
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dest[x] = ' '
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}
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}
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src += width
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dest += width
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}
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}
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void wait_frame() align(fast) {
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while vic_raster != $ff {}
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while vic_raster == $ff {}
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}
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#endif
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#if ZX_SPECTRUM
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void init_gfx() {
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}
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void redraw() align(fast) {
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pointer src, dest
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byte x, y
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src = buffer.addr
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dest = $5800
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for y,0,until,height {
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for x,0,until,width {
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if src[x] != 0 {
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dest[x] = 0
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} else {
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dest[x] = $3f
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}
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}
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src += width
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dest += width
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}
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}
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asm macro void wait_frame() {
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halt
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}
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#endif
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void main() {
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init_gfx()
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init_buffer()
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redraw()
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while true {
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wait_frame()
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do_round()
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redraw()
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}
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}
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