m17e.co
Fork of https://github.com/yatazet/cube-zig.
1const std = @import("std");
2
3const screen_width = 160;
4const screen_height = 44;
5const buffer_size = screen_width * screen_height;
6
7var A: f32 = 0;
8var B: f32 = 0;
9var C: f32 = 0;
10
11var zBuffer: [buffer_size]f32 = undefined;
12var buffer: [buffer_size]u8 = undefined;
13
14const distance_from_cam = 100.0;
15const K1: f32 = 40.0;
16const cube_width: f32 = 20.0;
17const increment_speed: f32 = 0.4;
18
19fn calculateX(i: f32, j: f32, k: f32) f32 {
20 return j * @sin(A) * @sin(B) * @cos(C) - k * @cos(A) * @sin(B) * @cos(C) + j * @cos(A) * @sin(C) + k * @sin(A) * @sin(C) + i * @cos(B) * @cos(C);
21}
22
23fn calculateY(i: f32, j: f32, k: f32) f32 {
24 return j * @cos(A) * @cos(C) + k * @sin(A) * @cos(C) - j * @sin(A) * @sin(B) * @sin(C) + k * @cos(A) * @sin(B) * @sin(C) - i * @cos(B) * @sin(C);
25}
26
27fn calculateZ(i: f32, j: f32, k: f32) f32 {
28 return k * @cos(A) * @cos(B) - j * @sin(A) * @cos(B) + i * @sin(B);
29}
30
31fn plot(i: f32, j: f32, k: f32, ch: u8) void {
32 const x = calculateX(i, j, k);
33 const y = calculateY(i, j, k);
34 const z = calculateZ(i, j, k) + distance_from_cam;
35
36 const ooz = 1 / z;
37
38 const xp: usize = @intFromFloat(@floor(screen_width / 2 + K1 * ooz * x * 2));
39 const yp: usize = @intFromFloat(@floor(screen_height / 2 + K1 * ooz * y));
40
41 const idx = xp + yp * screen_width;
42
43 if (xp < screen_width and yp < screen_height and idx < buffer_size) {
44 if (ooz > zBuffer[idx]) {
45 zBuffer[idx] = ooz;
46 buffer[idx] = ch;
47 }
48 }
49}
50
51pub fn main(init: std.process.Init) !void {
52 const io = init.io;
53 var write_buf: [4096]u8 = undefined;
54 var file_writer = std.Io.File.stdout().writerStreaming(io, &write_buf);
55 const stdout = &file_writer.interface;
56
57 try stdout.writeAll("\x1b[J");
58 try stdout.writeAll("\x1b[?25l");
59 try stdout.flush();
60 while (true) {
61 for (&buffer) |*b| b.* = ' ';
62 for (&zBuffer) |*z| z.* = 0;
63 var cubeX: f32 = -cube_width;
64 while (cubeX < cube_width) : (cubeX += increment_speed) {
65 var cubeY: f32 = -cube_width;
66 while (cubeY < cube_width) : (cubeY += increment_speed) {
67 plot(cubeX, cubeY, -cube_width, '@');
68 plot(cube_width, cubeY, cubeX, '$');
69 plot(-cube_width, cubeY, -cubeX, '~');
70 plot(-cubeX, cubeY, cube_width, '#');
71 plot(cubeX, -cube_width, -cubeY, ';');
72 plot(cubeX, cube_width, cubeY, '+');
73 }
74 }
75
76 try stdout.writeAll("\x1b[H");
77 for (buffer, 0..) |ch, i| {
78 if (i % screen_width == 0 and i != 0)
79 try stdout.writeByte('\n');
80 try stdout.writeByte(ch);
81 }
82 try stdout.flush();
83
84 A += 0.04;
85 B += 0.02;
86 C += 0.01;
87 try io.sleep(.fromNanoseconds(16_000_000), .real);
88 }
89}