From 0edb4a4df4b41e886935a91da3b2e50ddaa6817f Mon Sep 17 00:00:00 2001
From: Tom Barrett <tom@tombarrett.xyz>
Date: Sun, 18 Dec 2022 22:56:16 +0100
Subject: 2.2

---
 .gitignore   |  2 ++
 build.zig    | 31 +++++++++++++++++++++++++++++++
 src/main.zig | 23 +++++++++++++++++++++++
 3 files changed, 56 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 build.zig
 create mode 100644 src/main.zig

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..53b6426
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+zig-*
+*ppm
diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000..5dfbc9c
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,31 @@
+const std = @import("std");
+
+pub fn build(b: *std.build.Builder) void {
+    // Standard target options allows the person running `zig build` to choose
+    // what target to build for. Here we do not override the defaults, which
+    // means any target is allowed, and the default is native. Other options
+    // for restricting supported target set are available.
+    const target = b.standardTargetOptions(.{});
+
+    // Standard release options allow the person running `zig build` to select
+    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
+    const mode = b.standardReleaseOptions();
+
+    const exe = b.addExecutable("raytracing", "src/main.zig");
+    exe.setTarget(target);
+    exe.setBuildMode(mode);
+    exe.install();
+
+    const run_cmd = exe.run();
+    run_cmd.step.dependOn(b.getInstallStep());
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+
+    const exe_tests = b.addTest("src/main.zig");
+    exe_tests.setTarget(target);
+    exe_tests.setBuildMode(mode);
+}
diff --git a/src/main.zig b/src/main.zig
new file mode 100644
index 0000000..9983774
--- /dev/null
+++ b/src/main.zig
@@ -0,0 +1,23 @@
+const std = @import("std");
+
+pub fn main() !void {
+    const width = 256;
+    const height = 256;
+    std.debug.print("P3\n{} {}\n255\n", .{ width, height });
+
+    var j: usize = height;
+    while (j > 0) : (j -= 1) {
+        var i: usize = 0;
+        while (i < width) : (i += 1) {
+            var r: f32 = @intToFloat(f32, i) / (width - 1);
+            var g: f32 = @intToFloat(f32, j) / (height - 1);
+            var b: f32 = 0.25;
+
+            var ir: usize = @floatToInt(usize, r * 255.999);
+            var ig: usize = @floatToInt(usize, g * 255.999);
+            var ib: usize = @floatToInt(usize, b * 255.999);
+
+            std.debug.print("{} {} {}\n", .{ ir, ig, ib });
+        }
+    }
+}
-- 
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