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port rust tunnel example to zig

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This commit is contained in:
Dennis Ranke
2022-01-02 13:58:56 +01:00
parent 26206a312a
commit 88ee0e1bef
7 changed files with 77 additions and 12 deletions
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20
examples/zig/main.zig Normal file
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extern fn atan2(x: f32, y: f32) f32;
extern fn time() f32;
pub const FRAMEBUFFER: *[320*240]u8 = @intToPtr(*[320*240]u8, 120);
export fn upd() void {
var i: u32 = 0;
while(true) {
var t = time() * 63.0;
var x = @intToFloat(f32, (@intCast(i32, i % 320) - 160));
var y = @intToFloat(f32, (@intCast(i32, i / 320) - 120));
var d = 40000.0 / @sqrt(x * x + y * y + 1.0);
var u = atan2(x, y) * 512.0 / 3.141;
var c = @intCast(u8, (@floatToInt(i32, d + t * 2.0) ^ @floatToInt(i32, u + t)) & 255) >> 4;
FRAMEBUFFER[@as(usize, i)] = c;
i += 1;
if(i >= 320*240) { break; }
}
}