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const std = @import("std");
const Vec3f = @Vector(3, f64);
const Point3 = Vec3f;
const Color = Vec3f;
fn vecNorm(v: Vec3f) f64 {
return @sqrt(vecNormSquared(v));
}
fn vecNormSquared(v: Vec3f) f64 {
return v[0] * v[0] + v[1] * v[1] + v[2] * v[2];
}
fn vecDot(u: Vec3f, v: Vec3f) f64 {
return u[0] * v[0] + u[1] * v[1] + u[2] * v[2];
}
fn vecCross(u: Vec3f, v: Vec3f) Vec3f {
return Vec3f(
u[1] * v[2] - u[2] * v[1],
u[2] * v[0] - u[0] * v[2],
u[0] * v[1] - u[1] * v[0],
);
}
fn vecNormalized(v: Vec3f) Vec3f {
return v / vecNorm(v);
}
pub fn main() !void {
// Image
const image_width = 256;
const image_height = 256;
// Render
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", .{ image_width, image_height });
var j: i32 = image_height - 1;
while (j >= 0) {
std.debug.print("\rScanlines remaining: {}", .{j});
var i: i32 = 0;
while (i < image_width) {
const r = @intToFloat(f64, i) / (image_width - 1);
const g = @intToFloat(f64, j) / (image_height - 1);
const b = 0.25;
const ir = @floatToInt(u8, 255.999 * r);
const ig = @floatToInt(u8, 255.999 * g);
const ib = @floatToInt(u8, 255.999 * b);
try stdout.print("{} {} {}\n", .{ ir, ig, ib });
i += 1;
}
j -= 1;
}
try bw.flush();
}
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