const std = @import("std");
const warn = @import("std").debug.print;

pub fn write_color(stdout: anytype, v: vec) !void {
    const r = @floatToInt(usize, v[0] * 255.999);
    const g = @floatToInt(usize, v[1] * 255.999);
    const b = @floatToInt(usize, v[2] * 255.999);
    try stdout.print("{} {} {}\n", .{ r, g, b });
}

const vec = @Vector(3, f32);

pub fn main() !void {
    const width = 512;
    const height = 512;
    const stdout_file = std.io.getStdOut().writer();
    var bw = std.io.bufferedWriter(stdout_file);
    const stdout = bw.writer();

    try stdout.print("P3\n{} {}\n255\n", .{ width, height });

    var j: usize = height;
    while (j > 0) : (j -= 1) {
        warn("remaining: {}\n", .{j});
        var i: usize = 0;
        while (i < width) : (i += 1) {
            var color = vec{
                @intToFloat(f32, i) / (width - 1),
                @intToFloat(f32, j) / (height - 1),
                0.25,
            };

            try write_color(stdout, color);
        }
    }
    try bw.flush();
}