4 files changed, 170 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ee7098f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+zig-out/
+zig-cache/
diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000..e1266e6
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,50 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+
+    const optimize = b.standardOptimizeOption(.{});
+
+    const exe = b.addExecutable(.{
+        .name = "particle-sim",
+        .root_source_file = b.path("src/main.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    b.installArtifact(exe);
+
+    const run_cmd = b.addRunArtifact(exe);
+
+    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_unit_tests = b.addTest(.{
+        .root_source_file = b.path("src/main.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
+
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&run_exe_unit_tests.step);
+
+    const raylib_dep = b.dependency("raylib-zig", .{
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const raylib = raylib_dep.module("raylib"); // main raylib module
+    const raygui = raylib_dep.module("raygui"); // raygui module
+    const raylib_artifact = raylib_dep.artifact("raylib"); // raylib C library
+    exe.linkLibrary(raylib_artifact);
+    exe.root_module.addImport("raylib", raylib);
+    exe.root_module.addImport("raygui", raygui);
+}
diff --git a/build.zig.zon b/build.zig.zon
new file mode 100644
index 0000000..93588c2
--- /dev/null
+++ b/build.zig.zon
@@ -0,0 +1,36 @@
+.{
+    .name = "particle-sim",
+    // This is a [Semantic Version](https://semver.org/).
+    // In a future version of Zig it will be used for package deduplication.
+    .version = "0.0.0",
+
+    // This field is optional.
+    // This is currently advisory only; Zig does not yet do anything
+    // with this value.
+    //.minimum_zig_version = "0.11.0",
+
+    // This field is optional.
+    // Each dependency must either provide a `url` and `hash`, or a `path`.
+    // `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
+    // Once all dependencies are fetched, `zig build` no longer requires
+    // internet connectivity.
+    .dependencies = .{
+        .@"raylib-zig" = .{
+            .url = "https://github.com/Not-Nik/raylib-zig/archive/devel.tar.gz",
+            .hash = "12204a223b19043e17b79300413d02f60fc8004c0d9629b8d8072831e352a78bf212",
+        },
+    },
+    .paths = .{
+        // This makes *all* files, recursively, included in this package. It is generally
+        // better to explicitly list the files and directories instead, to insure that
+        // fetching from tarballs, file system paths, and version control all result
+        // in the same contents hash.
+        "",
+        // For example...
+        //"build.zig",
+        //"build.zig.zon",
+        //"src",
+        //"LICENSE",
+        //"README.md",
+    },
+}
diff --git a/src/main.zig b/src/main.zig
new file mode 100644
index 0000000..f021181
--- /dev/null
+++ b/src/main.zig
@@ -0,0 +1,82 @@
+const std = @import("std");
+const rl = @import("raylib");
+var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+
+const particle = struct {
+    color: rl.Color,
+    attrs: particleAttrs,
+    x: i32,
+    y: i32,
+    xvel: i32,
+    yvel: i32,
+};
+
+const particleAttrs = struct {};
+const screenWidth = 1920;
+const screenHeight = 1080;
+
+pub fn main() !void {
+    rl.initWindow(screenWidth, screenHeight, "Particle Simulator");
+    defer rl.closeWindow();
+
+    rl.setTargetFPS(60);
+
+    var particles = try initParticles(200);
+    defer particles.deinit();
+    defer {
+        switch (gpa.deinit()) {
+            std.heap.Check.leak => std.debug.print("\n\nLEAKS!!!!\n\n", .{}),
+            std.heap.Check.ok => std.debug.print("No leaks :3", .{}),
+        }
+    }
+    std.debug.print("{}\n", .{particles.items.len});
+
+    while (!rl.windowShouldClose()) {
+        rl.beginDrawing();
+        if (rl.isKeyPressed(rl.KeyboardKey.key_q)) break;
+
+        defer rl.endDrawing();
+
+        for (0..particles.items.len) |i| {
+            updateParticle(&particles.items[i]);
+            drawParticle(particles.items[i]);
+        }
+
+        rl.clearBackground(rl.Color.white);
+    }
+}
+
+inline fn drawParticle(p: particle) void {
+    rl.drawCircle(p.x, p.y, 1, p.color);
+}
+
+fn updateParticle(p: *particle) void {
+    p.x = @mod((p.x + p.xvel), screenWidth);
+    p.y = @mod((p.y + p.yvel), screenHeight);
+}
+
+fn createParticle(x: i32, y: i32, color: rl.Color, attrs: particleAttrs) particle {
+    return particle{
+        .color = color,
+        .attrs = attrs,
+        .x = x,
+        .y = y,
+        .xvel = 5,
+        .yvel = -7,
+    };
+}
+
+fn initParticles(amnt: u32) !std.ArrayList(particle) {
+    const colors = [_]rl.Color{ rl.Color.red, rl.Color.blue, rl.Color.green };
+    const seed = @as(u64, @truncate(@as(u128, @bitCast(std.time.nanoTimestamp()))));
+    var prng = std.rand.DefaultPrng.init(seed);
+
+    var particles = std.ArrayList(particle).init(gpa.allocator());
+    for (0..amnt) |_| {
+        const x = prng.random().uintLessThan(u32, screenWidth);
+        const y = prng.random().uintLessThan(u32, screenHeight);
+        const color = colors[prng.random().uintLessThan(u32, 3)];
+        try particles.append(createParticle(@intCast(x), @intCast(y), color, .{}));
+    }
+    return particles;
+}