RGBCube/DOOM-fire-zig
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Merge pull request #1 from bradms/cleanup

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Be more "Zig-like"
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const void* 2022-01-16 15:52:19 -05:00 • committed by GitHub
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1 changed files with 258 additions and 279 deletions
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src/main.zig
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@ -35,14 +35,14 @@ const stdin = std.io.getStdIn().reader();
/////////////////////////////////// ///////////////////////////////////
// do or do not - there is no try: catch unreachable instead of try on memory / file io // do or do not - there is no try: catch unreachable instead of try on memory / file io
// - put all try to initXXX() // - put all try to initXXX()
// for (i=0; i<MAX; i++) { ... } => var i=0; while (i<MAX) { defer i+=1; ... } // for (i=0; i<MAX; i++) { ... } => var i=0; while (i<MAX) : (i+=1) { ... }
/////////////////////////////////// ///////////////////////////////////
// zig helpers // zig helpers
/////////////////////////////////// ///////////////////////////////////
//// consts, vars, settings //// consts, vars, settings
var rand:std.rand.Random = undefined; var rand: std.rand.Random = undefined;
//// functions //// functions
@ -59,14 +59,16 @@ pub fn initRNG() !void {
// print // print
pub fn emit(s: []const u8) void { pub fn emit(s: []const u8) void {
const sz=stdout.write(s) catch unreachable; const sz = stdout.write(s) catch unreachable;
if (sz==0) {return;} // cauze I c if (sz == 0) {
return;
} // cauze I c
return; return;
} }
// format a string then print // format a string then print
pub fn emit_fmt(comptime s: []const u8, args: anytype) void { pub fn emitFmt(comptime s: []const u8, args: anytype) void {
const t=std.fmt.allocPrint(allocator,s,args) catch unreachable; const t = std.fmt.allocPrint(allocator, s, args) catch unreachable;
defer allocator.free(t); defer allocator.free(t);
emit(t); emit(t);
} }
@ -78,62 +80,61 @@ pub fn emit_fmt(comptime s: []const u8, args: anytype) void {
//// Settings //// Settings
//OSX specific ... maybe //OSX specific ... maybe
const TIOCGWINSZ=0x40087468; //ioctl flag const TIOCGWINSZ = 0x40087468; //ioctl flag
//term size //term size
const TermSz = struct { height: usize, width: usize }; const TermSz = struct { height: usize, width: usize };
var term_sz:TermSz = .{ .height=0, .width=0 }; // set via initTermSz var term_sz: TermSz = .{ .height = 0, .width = 0 }; // set via initTermSz
//ansi escape codes //ansi escape codes
const esc = "\x1B"; const esc = "\x1B";
const csi = esc++"["; const csi = esc ++ "[";
const cursor_save=esc++"7"; const cursor_save = esc ++ "7";
const cursor_load=esc++"8"; const cursor_load = esc ++ "8";
const cursor_show=csi++"?25h"; //h=high const cursor_show = csi ++ "?25h"; //h=high
const cursor_hide=csi++"?25l"; //l=low const cursor_hide = csi ++ "?25l"; //l=low
const cursor_home=csi++"1;1H"; //1,1 const cursor_home = csi ++ "1;1H"; //1,1
const screen_clear=csi++"2J"; const screen_clear = csi ++ "2J";
const screen_buf_on=csi++"?1049h"; //h=high const screen_buf_on = csi ++ "?1049h"; //h=high
const screen_buf_off=csi++"?1049l"; //l=low const screen_buf_off = csi ++ "?1049l"; //l=low
const line_clear_to_eol=csi++"0K"; const line_clear_to_eol = csi ++ "0K";
const color_reset=csi++"0m"; const color_reset = csi ++ "0m";
const color_fg="38;5;"; const color_fg = "38;5;";
const color_bg="48;5;"; const color_bg = "48;5;";
const color_fg_def=csi++color_fg++"15m"; // white const color_fg_def = csi ++ color_fg ++ "15m"; // white
const color_bg_def=csi++color_bg++"0m"; // black const color_bg_def = csi ++ color_bg ++ "0m"; // black
const color_def=color_bg_def++color_fg_def; const color_def = color_bg_def ++ color_fg_def;
const color_italic=csi++"3m"; const color_italic = csi ++ "3m";
const color_not_italic=csi++"23m"; const color_not_italic = csi ++ "23m";
const term_on=screen_buf_on++cursor_hide++cursor_home++screen_clear++color_def; const term_on = screen_buf_on ++ cursor_hide ++ cursor_home ++ screen_clear ++ color_def;
const term_off=screen_buf_off++cursor_show++nl; const term_off = screen_buf_off ++ cursor_show ++ nl;
//handy characters //handy characters
const nl="\n"; const nl = "\n";
const sep='▏'; const sep = '▏';
//colors //colors
const MAX_COLOR=256; const MAX_COLOR = 256;
const LAST_COLOR=MAX_COLOR-1; const LAST_COLOR = MAX_COLOR - 1;
var fg:[MAX_COLOR][]u8 = undefined; var fg: [MAX_COLOR][]u8 = undefined;
var bg:[MAX_COLOR][]u8 = undefined; var bg: [MAX_COLOR][]u8 = undefined;
//// functions //// functions
// cache fg/bg ansi codes // cache fg/bg ansi codes
pub fn initColor() void { pub fn initColor() void {
var color_idx:u16=0; var color_idx: u16 = 0;
while (color_idx<MAX_COLOR) { while (color_idx < MAX_COLOR) : (color_idx += 1) {
fg[color_idx]=std.fmt.allocPrint(allocator,"{s}38;5;{d}m",.{csi,color_idx}) catch unreachable; fg[color_idx] = std.fmt.allocPrint(allocator, "{s}38;5;{d}m", .{ csi, color_idx }) catch unreachable;
bg[color_idx]=std.fmt.allocPrint(allocator,"{s}48;5;{d}m",.{csi,color_idx}) catch unreachable; bg[color_idx] = std.fmt.allocPrint(allocator, "{s}48;5;{d}m", .{ csi, color_idx }) catch unreachable;
color_idx+=1;
} }
} }
@ -142,18 +143,18 @@ pub fn initColor() void {
//get terminal size given a tty //get terminal size given a tty
pub fn getTermSz(tty: std.os.fd_t) !TermSz { pub fn getTermSz(tty: std.os.fd_t) !TermSz {
var winsz = std.os.system.winsize { var winsz = std.os.system.winsize{ .ws_col = 0, .ws_row = 0, .ws_xpixel = 0, .ws_ypixel = 0 };
.ws_col=0, .ws_row=0, const rv = std.os.system.ioctl(tty, TIOCGWINSZ, @ptrToInt(&winsz));
.ws_xpixel=0, .ws_ypixel=0 const err = std.os.errno(rv);
}; if (rv == 0) {
const rv=std.os.system.ioctl(tty,TIOCGWINSZ, @ptrToInt(&winsz)); return TermSz{ .height = winsz.ws_row, .width = winsz.ws_col };
const err=std.os.errno(rv); } else {
if (rv==0) { return TermSz{ .height = winsz.ws_row, .width = winsz.ws_col }; } return std.os.unexpectedErrno(err);
else {return std.os.unexpectedErrno(err);} }
} }
pub fn initTermSize() !void { pub fn initTermSize() !void {
term_sz=try getTermSz(stdout.context.handle); term_sz = try getTermSz(stdout.context.handle);
} }
pub fn initTerm() !void { pub fn initTerm() !void {
@ -179,7 +180,7 @@ pub fn pause() void {
emit(color_reset); emit(color_reset);
emit("Press return to continue..."); emit("Press return to continue...");
var b:u8 = undefined; var b: u8 = undefined;
b = stdin.readByte() catch undefined; b = stdin.readByte() catch undefined;
if (b == 'q') { if (b == 'q') {
@ -189,7 +190,6 @@ pub fn pause() void {
} }
} }
/// Part I - Terminal Size Check /// Part I - Terminal Size Check
/// showTermCap() needs about 120x22; if screen is too small, give user a chance to abort and try again. /// showTermCap() needs about 120x22; if screen is too small, give user a chance to abort and try again.
/// ///
@ -198,28 +198,38 @@ pub fn pause() void {
// do nothing if term sz is big enough // do nothing if term sz is big enough
pub fn checkTermSz() void { pub fn checkTermSz() void {
const min_w=120; const min_w = 120;
const min_h=22; const min_h = 22;
var w_ok=true; var w_ok = true;
var h_ok=true; var h_ok = true;
// chk cur < min // chk cur < min
if (term_sz.width<min_w) { w_ok=false; } if (term_sz.width < min_w) {
if (term_sz.height<min_h) { h_ok=false; } w_ok = false;
}
if (term_sz.height < min_h) {
h_ok = false;
}
if (w_ok and h_ok) { return; } if (w_ok and h_ok) {
else { return;
} else {
//screen is too small //screen is too small
//red text //red text
emit(fg[9]); emit(fg[9]);
//check conditions //check conditions
if (w_ok and !h_ok) { emit_fmt("Screen may be too short - height is {d} and need {d}.",.{term_sz.height, min_h}); } if (w_ok and !h_ok) {
else if (!w_ok and h_ok) { emit_fmt("Screen may be too narrow - width is {d} and need {d}.",.{term_sz.width, min_w}); } emitFmt("Screen may be too short - height is {d} and need {d}.", .{ term_sz.height, min_h });
else { emit_fmt("Screen is too small - have {d} x {d} and need {d} x {d}",.{term_sz.width, term_sz.height, min_w, min_h}); } } else if (!w_ok and h_ok) {
emitFmt("Screen may be too narrow - width is {d} and need {d}.", .{ term_sz.width, min_w });
} else {
emitFmt("Screen is too small - have {d} x {d} and need {d} x {d}", .{ term_sz.width, term_sz.height, min_w, min_h });
}
emit(nl);emit(nl); emit(nl);
emit(nl);
//warn user w/white on red //warn user w/white on red
emit(bg[1]); emit(bg[1]);
@ -244,14 +254,13 @@ pub fn checkTermSz() void {
/// Since user terminals vary in capabilities, handy to have a screen that renders ACTUAL colors /// Since user terminals vary in capabilities, handy to have a screen that renders ACTUAL colors
/// and exercises various terminal commands prior to DOOM fire. /// and exercises various terminal commands prior to DOOM fire.
/// ///
pub fn showTermSz() void { pub fn showTermSz() void {
//todo - show os, os ver, zig ver //todo - show os, os ver, zig ver
emit_fmt("Screen size: {d}w x {d}h\n\n", .{term_sz.width, term_sz.height}); emitFmt("Screen size: {d}w x {d}h\n\n", .{ term_sz.width, term_sz.height });
} }
pub fn showLabel(label:[]const u8) void { pub fn showLabel(label: []const u8) void {
emit_fmt("{s}{s}:\n",.{color_def,label}); emitFmt("{s}{s}:\n", .{ color_def, label });
} }
pub fn showStdColors() void { pub fn showStdColors() void {
@ -259,23 +268,24 @@ pub fn showStdColors() void {
//first 8 colors (standard) //first 8 colors (standard)
emit(fg[15]); emit(fg[15]);
var color_idx:u8=0; var color_idx: u8 = 0;
while (color_idx<8) { while (color_idx < 8) : (color_idx += 1) {
defer color_idx+=1;
emit(bg[color_idx]); emit(bg[color_idx]);
if (color_idx==7) { emit(fg[0]); } if (color_idx == 7) {
emit_fmt("{u} {d:2} ", .{sep,color_idx}); emit(fg[0]);
}
emitFmt("{u} {d:2} ", .{ sep, color_idx });
} }
emit(nl); emit(nl);
//next 8 colors ("hilight") //next 8 colors ("hilight")
emit(fg[15]); emit(fg[15]);
while (color_idx<16) { while (color_idx < 16) : (color_idx += 1) {
defer color_idx+=1;
emit(bg[color_idx]); emit(bg[color_idx]);
if (color_idx==15) { emit(fg[0]); } if (color_idx == 15) {
emit_fmt("{u} {d:2} ", .{sep,color_idx}); emit(fg[0]);
}
emitFmt("{u} {d:2} ", .{ sep, color_idx });
} }
emit(nl); emit(nl);
@ -285,37 +295,33 @@ pub fn showStdColors() void {
pub fn show216Colors() void { pub fn show216Colors() void {
showLabel("216 colors"); showLabel("216 colors");
var color_addendum:u8=0; var color_addendum: u8 = 0;
var bg_idx:u8=0; var bg_idx: u8 = 0;
var fg_idx:u8=0; var fg_idx: u8 = 0;
//show remaining of colors in 6 blocks of 6x6 //show remaining of colors in 6 blocks of 6x6
// 6 rows of color // 6 rows of color
var color_shift:u8=0; var color_shift: u8 = 0;
while (color_shift<6) { while (color_shift < 6) : (color_shift += 1) {
defer color_shift+=1; color_addendum = color_shift * 36 + 16;
color_addendum=color_shift*36+16;
// colors are pre-organized into blocks // colors are pre-organized into blocks
var color_idx:u8=0; var color_idx: u8 = 0;
while(color_idx<36) { while (color_idx < 36) : (color_idx += 1) {
defer color_idx+=1; bg_idx = color_idx + color_addendum;
bg_idx=color_idx+color_addendum;
// invert color id for readability // invert color id for readability
if (color_idx>17) { if (color_idx > 17) {
fg_idx=0; fg_idx = 0;
} } else {
else { fg_idx = 15;
fg_idx=15;
} }
// display color // display color
emit(bg[bg_idx]); emit(bg[bg_idx]);
emit(fg[fg_idx]); emit(fg[fg_idx]);
emit_fmt("{d:3}",.{bg_idx}); emitFmt("{d:3}", .{bg_idx});
} }
emit(nl); emit(nl);
} }
@ -325,20 +331,18 @@ pub fn show216Colors() void {
pub fn showGrayscale() void { pub fn showGrayscale() void {
showLabel("Grayscale"); showLabel("Grayscale");
var fg_idx:u8=15; var fg_idx: u8 = 15;
emit(fg[fg_idx]); emit(fg[fg_idx]);
var bg_idx:u16=232; var bg_idx: u16 = 232;
while (bg_idx<256) { while (bg_idx < 256) : (bg_idx += 1) {
defer bg_idx+=1; if (bg_idx > 243) {
fg_idx = 0;
if (bg_idx>243) {
fg_idx=0;
emit(fg[fg_idx]); emit(fg[fg_idx]);
} }
emit(bg[bg_idx]); emit(bg[bg_idx]);
emit_fmt("{u}{d} ",.{sep,bg_idx}); emitFmt("{u}{d} ", .{ sep, bg_idx });
} }
emit(nl); emit(nl);
@ -349,9 +353,9 @@ pub fn showGrayscale() void {
pub fn scrollMarquee() void { pub fn scrollMarquee() void {
//marquee - 4 lines of yellowish background //marquee - 4 lines of yellowish background
const bg_idx:u8=222; const bg_idx: u8 = 222;
const marquee_row=line_clear_to_eol++nl; const marquee_row = line_clear_to_eol ++ nl;
const marquee_bg=marquee_row++marquee_row++marquee_row++marquee_row; const marquee_bg = marquee_row ++ marquee_row ++ marquee_row ++ marquee_row;
//init marquee background //init marquee background
emit(cursor_save); emit(cursor_save);
@ -359,32 +363,20 @@ pub fn scrollMarquee() void {
emit(marquee_bg); emit(marquee_bg);
//quotes - will confirm animations are working on current terminal //quotes - will confirm animations are working on current terminal
const txt =[_][]const u8{ const txt = [_][]const u8{ " Things move along so rapidly nowadays that people saying " ++ color_italic ++ "It can't be done" ++ color_not_italic ++ " are always being interrupted", " by somebody doing it. " ++ color_italic ++ "-- Puck, 1902" ++ color_not_italic, " Test your might!", " " ++ color_italic ++ "-- Mortal Kombat" ++ color_not_italic, " How much is the fish?", " " ++ color_italic ++ "-- Scooter" ++ color_not_italic };
" Things move along so rapidly nowadays that people saying "++color_italic++"It can't be done"++color_not_italic++" are always being interrupted", const txt_len: u8 = txt.len / 2; // print two rows at a time
" by somebody doing it. "++color_italic++"-- Puck, 1902"++color_not_italic,
" Test your might!",
" "++color_italic++"-- Mortal Kombat"++color_not_italic,
" How much is the fish?",
" "++color_italic++"-- Scooter"++color_not_italic};
const txt_len:u8 = txt.len/2; // print two rows at a time
//fade txt in and out //fade txt in and out
const fade_seq=[_]u8{222,221,220,215,214,184,178,130,235,58,16}; const fade_seq = [_]u8{ 222, 221, 220, 215, 214, 184, 178, 130, 235, 58, 16 };
const fade_len:u8=fade_seq.len; const fade_len: u8 = fade_seq.len;
var fade_idx:u8=0; var fade_idx: u8 = 0;
var txt_idx:u8=0; var txt_idx: u8 = 0;
while (txt_idx<txt_len) {
defer txt_idx+=1;
while (txt_idx < txt_len) : (txt_idx += 1) {
//fade in //fade in
fade_idx=0; fade_idx = 0;
while (fade_idx<fade_len) { while (fade_idx < fade_len) : (fade_idx += 1) {
defer fade_idx+=1;
//reset to 1,1 of marquee //reset to 1,1 of marquee
emit(cursor_load); emit(cursor_load);
emit(bg[bg_idx]); emit(bg[bg_idx]);
@ -392,10 +384,10 @@ pub fn scrollMarquee() void {
//print marquee txt //print marquee txt
emit(fg[fade_seq[fade_idx]]); emit(fg[fade_seq[fade_idx]]);
emit(txt[txt_idx*2]); emit(txt[txt_idx * 2]);
emit(line_clear_to_eol); emit(line_clear_to_eol);
emit(nl); emit(nl);
emit(txt[txt_idx*2+1]); emit(txt[txt_idx * 2 + 1]);
emit(line_clear_to_eol); emit(line_clear_to_eol);
emit(nl); emit(nl);
@ -405,12 +397,9 @@ pub fn scrollMarquee() void {
//let quote chill for a second //let quote chill for a second
std.time.sleep(1000 * std.time.ns_per_ms); std.time.sleep(1000 * std.time.ns_per_ms);
//fade out //fade out
fade_idx=fade_len-1; fade_idx = fade_len - 1;
while (fade_idx>0) { while (fade_idx > 0) : (fade_idx -= 1) {
defer fade_idx-=1;
//reset to 1,1 of marquee //reset to 1,1 of marquee
emit(cursor_load); emit(cursor_load);
emit(bg[bg_idx]); emit(bg[bg_idx]);
@ -418,10 +407,10 @@ pub fn scrollMarquee() void {
//print marquee txt //print marquee txt
emit(fg[fade_seq[fade_idx]]); emit(fg[fade_seq[fade_idx]]);
emit(txt[txt_idx*2]); emit(txt[txt_idx * 2]);
emit(line_clear_to_eol); emit(line_clear_to_eol);
emit(nl); emit(nl);
emit(txt[txt_idx*2+1]); emit(txt[txt_idx * 2 + 1]);
emit(line_clear_to_eol); emit(line_clear_to_eol);
emit(nl); emit(nl);
std.time.sleep(10 * std.time.ns_per_ms); std.time.sleep(10 * std.time.ns_per_ms);
@ -446,109 +435,109 @@ pub fn showTermCap() void {
/// Below - moderately faster /// Below - moderately faster
//pixel character //pixel character
const px="▀"; const px = "▀";
//bs = buffer string //bs = buffer string
var bs:[]u8=undefined; var bs: []u8 = undefined;
var bs_idx:u32=0; var bs_idx: u32 = 0;
var bs_len:u32=0; var bs_len: u32 = 0;
var bs_sz_min:u32=0; var bs_sz_min: u32 = 0;
var bs_sz_max:u32=0; var bs_sz_max: u32 = 0;
var bs_sz_avg:u32=0; var bs_sz_avg: u32 = 0;
var bs_frame_tic:u32=0; var bs_frame_tic: u32 = 0;
var t_start:i64=0; var t_start: i64 = 0;
var t_now:i64=0; var t_now: i64 = 0;
var t_dur:f64=0.0; var t_dur: f64 = 0.0;
var fps:f64=0.0; var fps: f64 = 0.0;
pub fn initBuf() void { pub fn initBuf() void {
//some lazy guesswork to make sure we have enough of a buffer to render DOOM fire. //some lazy guesswork to make sure we have enough of a buffer to render DOOM fire.
const px_char_sz=px.len; const px_char_sz = px.len;
const px_color_sz=bg[LAST_COLOR].len+fg[LAST_COLOR].len; const px_color_sz = bg[LAST_COLOR].len + fg[LAST_COLOR].len;
const px_sz=px_color_sz+px_char_sz; const px_sz = px_color_sz + px_char_sz;
const screen_sz:u64=@as(u64,px_sz*term_sz.width*term_sz.width); const screen_sz: u64 = @as(u64, px_sz * term_sz.width * term_sz.width);
const overflow_sz:u64=px_char_sz*100; const overflow_sz: u64 = px_char_sz * 100;
const bs_sz:u64=screen_sz+overflow_sz; const bs_sz: u64 = screen_sz + overflow_sz;
bs=allocator.alloc(u8,bs_sz*2) catch unreachable; bs = allocator.alloc(u8, bs_sz * 2) catch unreachable;
t_start=std.time.milliTimestamp(); t_start = std.time.milliTimestamp();
resetBuf(); resetBuf();
} }
//reset buffer indexes to start of buffer //reset buffer indexes to start of buffer
pub fn resetBuf() void { pub fn resetBuf() void {
bs_idx=0; bs_idx = 0;
bs_len=0; bs_len = 0;
} }
//copy input string to buffer string //copy input string to buffer string
pub fn drawBuf(s:[]const u8) void { pub fn drawBuf(s: []const u8) void {
for (s) |b| { for (s) |b| {
bs[bs_idx] = b; bs[bs_idx] = b;
bs_idx+=1; bs_idx += 1;
bs_len+=1; bs_len += 1;
}
} }
}
//print buffer to string...can be a decent amount of text! //print buffer to string...can be a decent amount of text!
pub fn paintBuf() void { pub fn paintBuf() void {
emit(bs[0..bs_len-1]); emit(bs[0 .. bs_len - 1]);
t_now=std.time.milliTimestamp(); t_now = std.time.milliTimestamp();
bs_frame_tic+=1; bs_frame_tic += 1;
if (bs_sz_min==0) { if (bs_sz_min == 0) {
//first frame //first frame
bs_sz_min=bs_len; bs_sz_min = bs_len;
bs_sz_max=bs_len; bs_sz_max = bs_len;
bs_sz_avg=bs_len; bs_sz_avg = bs_len;
} else {
if (bs_len < bs_sz_min) {
bs_sz_min = bs_len;
} }
else { if (bs_len > bs_sz_max) {
if( bs_len < bs_sz_min) { bs_sz_min=bs_len; } bs_sz_max = bs_len;
if( bs_len > bs_sz_max) { bs_sz_max=bs_len; } }
bs_sz_avg=bs_sz_avg*(bs_frame_tic-1)/bs_frame_tic+bs_len/bs_frame_tic; bs_sz_avg = bs_sz_avg * (bs_frame_tic - 1) / bs_frame_tic + bs_len / bs_frame_tic;
} }
t_dur=@intToFloat(f64,t_now-t_start)/1000.0; t_dur = @intToFloat(f64, t_now - t_start) / 1000.0;
fps=@intToFloat(f64,bs_frame_tic)/t_dur; fps = @intToFloat(f64, bs_frame_tic) / t_dur;
emit(fg[0]); emit(fg[0]);
emit_fmt("mem: {s:.2} min / {s:.2} avg / {s:.2} max [ {d:.2} fps ]",.{std.fmt.fmtIntSizeBin(bs_sz_min), std.fmt.fmtIntSizeBin(bs_sz_avg), std.fmt.fmtIntSizeBin(bs_sz_max), fps}); emitFmt("mem: {s:.2} min / {s:.2} avg / {s:.2} max [ {d:.2} fps ]", .{ std.fmt.fmtIntSizeBin(bs_sz_min), std.fmt.fmtIntSizeBin(bs_sz_avg), std.fmt.fmtIntSizeBin(bs_sz_max), fps });
} }
// initBuf(); defer freeBuf(); // initBuf(); defer freeBuf();
pub fn freeBuf() void { allocator.free(bs); } pub fn freeBuf() void {
allocator.free(bs);
}
pub fn showDoomFire() void { pub fn showDoomFire() void {
//term size => fire size //term size => fire size
const FIRE_H:u16=@intCast(u16,term_sz.height)*2; const FIRE_H: u16 = @intCast(u16, term_sz.height) * 2;
const FIRE_W:u16=@intCast(u16,term_sz.width); const FIRE_W: u16 = @intCast(u16, term_sz.width);
const FIRE_SZ:u16=FIRE_H*FIRE_W; const FIRE_SZ: u16 = FIRE_H * FIRE_W;
const FIRE_LAST_ROW:u16=(FIRE_H-1)*FIRE_W; const FIRE_LAST_ROW: u16 = (FIRE_H - 1) * FIRE_W;
//colors - tinker w/palette as needed! //colors - tinker w/palette as needed!
const fire_palette=[_]u8{0,233,234,52,53,88,89,94,95,96,130,131,132,133,172,214,215,220,220,221,3,226,227,230,195,230}; const fire_palette = [_]u8{ 0, 233, 234, 52, 53, 88, 89, 94, 95, 96, 130, 131, 132, 133, 172, 214, 215, 220, 220, 221, 3, 226, 227, 230, 195, 230 };
const fire_black:u8=0; const fire_black: u8 = 0;
const fire_white:u8=fire_palette.len-1; const fire_white: u8 = fire_palette.len - 1;
//screen buf default color is black //screen buf default color is black
var screen_buf:[]u8=undefined; //{fire_black}**FIRE_SZ; var screen_buf: []u8 = undefined; //{fire_black}**FIRE_SZ;
screen_buf=allocator.alloc(u8,FIRE_SZ) catch unreachable; screen_buf = allocator.alloc(u8, FIRE_SZ) catch unreachable;
defer allocator.free(screen_buf); defer allocator.free(screen_buf);
//init buffer //init buffer
var buf_idx:u16=0; var buf_idx: u16 = 0;
while(buf_idx<FIRE_SZ) { while (buf_idx < FIRE_SZ) : (buf_idx += 1) {
defer buf_idx+=1; screen_buf[buf_idx] = fire_black;
screen_buf[buf_idx]=fire_black;
} }
//last row is white...white is "fire source" //last row is white...white is "fire source"
buf_idx=0; buf_idx = 0;
while (buf_idx<FIRE_W) { while (buf_idx < FIRE_W) : (buf_idx += 1) {
defer buf_idx+=1; screen_buf[FIRE_LAST_ROW + buf_idx] = fire_white;
screen_buf[FIRE_LAST_ROW+buf_idx]=fire_white;
} }
//reset terminal //reset terminal
@ -559,60 +548,55 @@ pub fn showDoomFire() void {
//scope cache //////////////////// //scope cache ////////////////////
//scope cache - update fire buf //scope cache - update fire buf
var doFire_x:u16=0; var doFire_x: u16 = 0;
var doFire_y:u16=0; var doFire_y: u16 = 0;
var doFire_idx:u16=0; var doFire_idx: u16 = 0;
//scope cache - spread fire //scope cache - spread fire
var spread_px:u8=0; var spread_px: u8 = 0;
var spread_rnd_idx:u8=0; var spread_rnd_idx: u8 = 0;
var spread_dst:u16=0; var spread_dst: u16 = 0;
//scope cache - frame reset //scope cache - frame reset
const init_frame=std.fmt.allocPrint(allocator,"{s}{s}{s}",.{cursor_home,bg[0],fg[0]}) catch unreachable; const init_frame = std.fmt.allocPrint(allocator, "{s}{s}{s}", .{ cursor_home, bg[0], fg[0] }) catch unreachable;
defer allocator.free(init_frame); defer allocator.free(init_frame);
//scope cache - fire 2 screen buffer //scope cache - fire 2 screen buffer
var frame_x:u16=0; var frame_x: u16 = 0;
var frame_y:u16=0; var frame_y: u16 = 0;
var px_hi:u8=fire_black; var px_hi: u8 = fire_black;
var px_lo:u8=fire_black; var px_lo: u8 = fire_black;
var px_prev_hi=px_hi; var px_prev_hi = px_hi;
var px_prev_lo=px_lo; var px_prev_lo = px_lo;
//get to work! //get to work!
initBuf(); initBuf();
defer freeBuf(); defer freeBuf();
//when there is an ez way to poll for key stroke...do that. for now, ctrl+c! //when there is an ez way to poll for key stroke...do that. for now, ctrl+c!
var ok=true; var ok = true;
while(ok){ while (ok) {
//update fire buf //update fire buf
doFire_x=0; doFire_x = 0;
while(doFire_x<FIRE_W) { while (doFire_x < FIRE_W) : (doFire_x += 1) {
defer doFire_x+=1; doFire_y = 0;
while (doFire_y < FIRE_H) : (doFire_y += 1) {
doFire_y=0; doFire_idx = doFire_y * FIRE_W + doFire_x;
while(doFire_y<FIRE_H) {
defer doFire_y+=1;
doFire_idx=doFire_y*FIRE_W+doFire_x;
//spread fire //spread fire
spread_px = screen_buf[doFire_idx]; spread_px = screen_buf[doFire_idx];
//bounds checking //bounds checking
if ( (spread_px==0) and (doFire_idx>=FIRE_W) ) { if ((spread_px == 0) and (doFire_idx >= FIRE_W)) {
screen_buf[doFire_idx-FIRE_W]=0; screen_buf[doFire_idx - FIRE_W] = 0;
} } else {
else {
spread_rnd_idx = rand.intRangeAtMost(u8, 0, 3); spread_rnd_idx = rand.intRangeAtMost(u8, 0, 3);
if (doFire_idx>=(spread_rnd_idx+1)) { if (doFire_idx >= (spread_rnd_idx + 1)) {
spread_dst=doFire_idx-spread_rnd_idx+1; spread_dst = doFire_idx - spread_rnd_idx + 1;
} }
if (( spread_dst>=FIRE_W ) and (spread_px > (spread_rnd_idx & 1))) { if ((spread_dst >= FIRE_W) and (spread_px > (spread_rnd_idx & 1))) {
screen_buf[spread_dst-FIRE_W]=spread_px - (spread_rnd_idx & 1); screen_buf[spread_dst - FIRE_W] = spread_px - (spread_rnd_idx & 1);
} }
} }
} }
@ -623,33 +607,29 @@ pub fn showDoomFire() void {
drawBuf(init_frame); drawBuf(init_frame);
// for each row // for each row
frame_y=0; frame_y = 0;
while (frame_y<FIRE_H) { while (frame_y < FIRE_H) : (frame_y += 2) { // 'paint' two rows at a time because of half height char
defer frame_y+=2; // 'paint' two rows at a time because of half height char
// for each col // for each col
frame_x=0; frame_x = 0;
while (frame_x<FIRE_W) { while (frame_x < FIRE_W) : (frame_x += 1) {
defer frame_x+=1;
//each character rendered is actually to rows of 'pixels' //each character rendered is actually to rows of 'pixels'
// - "hi" (current px row => fg char) // - "hi" (current px row => fg char)
// - "low" (next row => bg color) // - "low" (next row => bg color)
px_hi=screen_buf[frame_y*FIRE_W+frame_x]; px_hi = screen_buf[frame_y * FIRE_W + frame_x];
px_lo=screen_buf[(frame_y+1)*FIRE_W+frame_x]; px_lo = screen_buf[(frame_y + 1) * FIRE_W + frame_x];
// only *update* color if prior color is actually diff // only *update* color if prior color is actually diff
if (px_lo!=px_prev_lo) { if (px_lo != px_prev_lo) {
drawBuf(bg[fire_palette[px_lo]]); drawBuf(bg[fire_palette[px_lo]]);
} }
if (px_hi!=px_prev_hi) { if (px_hi != px_prev_hi) {
drawBuf(fg[fire_palette[px_hi]]); drawBuf(fg[fire_palette[px_hi]]);
} }
drawBuf(px); drawBuf(px);
//cache current colors //cache current colors
px_prev_hi=px_hi; px_prev_hi = px_hi;
px_prev_lo=px_lo; px_prev_lo = px_lo;
} }
drawBuf(nl); //is this needed? drawBuf(nl); //is this needed?
} }
@ -669,5 +649,4 @@ pub fn main() anyerror!void {
checkTermSz(); checkTermSz();
showTermCap(); showTermCap();
showDoomFire(); showDoomFire();
} }