initial commit

Signed-off-by: faukah <fau@faukah.com>
Change-Id: I6a6a69645add91c6178de9a2b56e175e3828bfca

.envrc

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+use flake

.gitignore

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+.zig-cache
+zig-out
+.direnv
+target

build.zig

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+const std = @import("std");
+
+const Scanner = @import("wayland").Scanner;
+
+// Although this function looks imperative, note that its job is to
+// declaratively construct a build graph that will be executed by an external
+// runner.
+pub fn build(b: *std.Build) 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 optimization options allow the person running `zig build` to select
+    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
+    // set a preferred release mode, allowing the user to decide how to optimize.
+    const optimize = b.standardOptimizeOption(.{});
+
+    const scanner = Scanner.create(b, .{});
+
+    const wayland = b.createModule(.{ .root_source_file = scanner.result, .target = target, .optimize = optimize });
+
+    const wlr_protocols = b.dependency("wlr-protocols", .{});
+
+    scanner.addCustomProtocol(wlr_protocols.path("unstable/wlr-layer-shell-unstable-v1.xml"));
+    scanner.addSystemProtocol("stable/xdg-shell/xdg-shell.xml");
+
+    scanner.generate("wl_shm", 1);
+    scanner.generate("xdg_wm_base", 2);
+    scanner.generate("wl_output", 4);
+    scanner.generate("zwlr_layer_shell_v1", 1);
+    scanner.generate("wl_compositor", 5);
+
+    // We will also create a module for our other entry point, 'main.zig'.
+    const exe_mod = b.createModule(.{
+        .root_source_file = b.path("src/main.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    exe_mod.addImport("wayland", wayland);
+
+    // This creates another `std.Build.Step.Compile`, but this one builds an executable
+    // rather than a static library.
+    const exe = b.addExecutable(.{
+        .name = "zayneko",
+        .root_module = exe_mod,
+    });
+
+    exe.linkLibC();
+    exe.linkSystemLibrary("wayland-client");
+
+    // This declares intent for the executable to be installed into the
+    // standard location when the user invokes the "install" step (the default
+    // step when running `zig build`).
+    b.installArtifact(exe);
+
+    // This *creates* a Run step in the build graph, to be executed when another
+    // step is evaluated that depends on it. The next line below will establish
+    // such a dependency.
+    const run_cmd = b.addRunArtifact(exe);
+
+    // By making the run step depend on the install step, it will be run from the
+    // installation directory rather than directly from within the cache directory.
+    // This is not necessary, however, if the application depends on other installed
+    // files, this ensures they will be present and in the expected location.
+    run_cmd.step.dependOn(b.getInstallStep());
+
+    // This allows the user to pass arguments to the application in the build
+    // command itself, like this: `zig build run -- arg1 arg2 etc`
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+
+    // This creates a build step. It will be visible in the `zig build --help` menu,
+    // and can be selected like this: `zig build run`
+    // This will evaluate the `run` step rather than the default, which is "install".
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+
+    const exe_unit_tests = b.addTest(.{
+        .root_module = exe_mod,
+    });
+
+    const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
+
+    // Similar to creating the run step earlier, this exposes a `test` step to
+    // the `zig build --help` menu, providing a way for the user to request
+    // running the unit tests.
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&run_exe_unit_tests.step);
+}

build.zig.zon

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+.{
+    // This is the default name used by packages depending on this one. For
+    // example, when a user runs `zig fetch --save <url>`, this field is used
+    // as the key in the `dependencies` table. Although the user can choose a
+    // different name, most users will stick with this provided value.
+    //
+    // It is redundant to include "zig" in this name because it is already
+    // within the Zig package namespace.
+    .name = .zayneko,
+
+    // 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",
+
+    // Together with name, this represents a globally unique package
+    // identifier. This field is generated by the Zig toolchain when the
+    // package is first created, and then *never changes*. This allows
+    // unambiguous detection of one package being an updated version of
+    // another.
+    //
+    // When forking a Zig project, this id should be regenerated (delete the
+    // field and run `zig build`) if the upstream project is still maintained.
+    // Otherwise, the fork is *hostile*, attempting to take control over the
+    // original project's identity. Thus it is recommended to leave the comment
+    // on the following line intact, so that it shows up in code reviews that
+    // modify the field.
+    .fingerprint = 0x2cff4904a359ccff, // Changing this has security and trust implications.
+
+    // Tracks the earliest Zig version that the package considers to be a
+    // supported use case.
+    .minimum_zig_version = "0.14.0",
+
+    // 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 = .{
+        .wayland = .{
+            .url = "https://codeberg.org/ifreund/zig-wayland/archive/v0.3.0.tar.gz",
+            .hash = "wayland-0.3.0-lQa1kjPIAQDmhGYpY-zxiRzQJFHQ2VqhJkQLbKKdt5wl",
+        },
+        .@"wlr-protocols" = .{
+            .url = "git+https://gitlab.freedesktop.org/wlroots/wlr-protocols.git#2ec67ebd26b73bada12f3fa6afdd51563b656722",
+            .hash = "N-V-__8AAMm4AQBQdtoOaA3SHeMraj1_jhjp6KQJy4_dbQnz",
+        },
+    },
+    .paths = .{
+        "build.zig",
+        "build.zig.zon",
+        "src",
+        // For example...
+        //"LICENSE",
+        //"README.md",
+    },
+}

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1747327360,
+        "narHash": "sha256-LSmTbiq/nqZR9B2t4MRnWG7cb0KVNU70dB7RT4+wYK4=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "e06158e58f3adee28b139e9c2bcfcc41f8625b46",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "A very basic flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+  } @ inputs: let
+    inherit (inputs.nixpkgs) lib;
+    eachSystem = lib.genAttrs (import inputs.systems);
+    pkgsFor = inputs.nixpkgs.legacyPackages;
+  in {
+    devShells =
+      lib.mapAttrs (system: pkgs: {
+        default = pkgs.mkShell {
+          packages = with pkgs; [
+            pkg-config
+            wayland-scanner
+            zig
+            wayland
+            wayland-protocols
+          ];
+
+          shellHook = ''
+            export LD_LIBRARY_PATH=${pkgs.wayland}/lib:$LD_LIBRARY_PATH
+          '';
+        };
+      })
+      pkgsFor;
+  };
+}

src/main.zig

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+const std = @import("std");
+const mem = std.mem;
+const posix = std.posix;
+
+const wayland = @import("wayland");
+const wl = wayland.client.wl;
+const zwlr = wayland.client.zwlr;
+const layer_shell = zwlr.common.zwlr.layer_shell_v1;
+
+const Context = struct {
+    shm: ?*wl.Shm = null,
+
+    shell: *zwlr.LayerShellV1 = undefined,
+    surface: *wl.Surface = undefined,
+
+    layer_surface: *zwlr.LayerSurfaceV1 = undefined,
+    buffer: ?*wl.Buffer = null,
+
+    compositor: *wl.Compositor = undefined,
+    blk: []u32 = undefined,
+
+    // width and height of our context
+    width: i32 = 0,
+    height: i32 = 0,
+};
+
+pub fn main() !void {
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+
+    const display = try wl.Display.connect(null);
+
+    defer display.disconnect();
+
+    const registry = try display.getRegistry();
+
+    defer registry.destroy();
+
+    var context = Context{};
+    registry.setListener(*Context, registryListener, &context);
+    if (display.roundtrip() != .SUCCESS) return error.RoundtripFailed;
+
+    context.surface = try context.compositor.createSurface();
+    defer context.surface.destroy();
+
+    context.layer_surface = try context.shell.getLayerSurface(context.surface, null, .top, "zayneko");
+    defer context.layer_surface.destroy();
+
+    context.layer_surface.setExclusiveZone(0);
+    context.layer_surface.setAnchor(.{
+        .top = false,
+        .bottom = true,
+        .left = true,
+        .right = true,
+    });
+
+    context.layer_surface.setSize(0, 30);
+    context.layer_surface.setListener(*Context, layerSurfaceListener, &context);
+
+    context.surface.commit();
+    if (display.roundtrip() != .SUCCESS) return error.RoundtripFailed;
+
+    std.debug.print("{}\n", .{context.blk.len});
+    std.debug.print("Width: {}\n", .{context.width});
+    std.debug.print("Height: {}\n", .{context.height});
+
+    context.surface.attach(context.buffer, 0, 0);
+    context.surface.commit();
+    if (display.roundtrip() != .SUCCESS) return error.RoundtripFailed;
+
+    while (true) {
+        const segment: usize =
+            @intCast(@divFloor(context.width, 10));
+        for (0..segment) |i| {
+            std.debug.print("{}\n", .{i});
+            const casted: i32 = @intCast(i);
+
+            moveBuffer(casted, &context);
+            _ = display.flush();
+            if (display.dispatchPending() != .SUCCESS) return error.DispatchFailed;
+            std.time.sleep(5000000);
+        }
+        for (0..segment) |i| {
+            // const casted: i32 = @intCast(i);
+            std.debug.print("smaller {}\n", .{(segment - i)});
+            moveBuffer(@intCast(segment - i), &context);
+            _ = display.flush();
+            if (display.dispatchPending() != .SUCCESS) return error.DispatchFailed;
+            std.time.sleep(5000000);
+        }
+    }
+
+    // std.time.sleep(4000000000);
+}
+
+fn registryListener(
+    registry: *wl.Registry,
+    event: wl.Registry.Event,
+    context: *Context,
+) void {
+    switch (event) {
+        .global => |global| {
+            if (mem.orderZ(u8, global.interface, wl.Shm.interface.name) == .eq) {
+                context.shm = registry.bind(global.name, wl.Shm, 1) catch return;
+            } else if (mem.orderZ(u8, global.interface, zwlr.LayerShellV1.interface.name) == .eq) {
+                context.shell = registry.bind(global.name, zwlr.LayerShellV1, 4) catch return;
+            } else if (mem.orderZ(u8, global.interface, wl.Compositor.interface.name) == .eq) {
+                context.compositor = registry.bind(global.name, wl.Compositor, 5) catch return;
+            }
+        },
+        .global_remove => {},
+    }
+}
+
+fn moveBuffer(offset: i32, context: *Context) void {
+    @memset(context.blk, 0);
+
+    for (context.blk, 0..context.blk.len) |*a, i| {
+        const context_width: usize = @intCast(context.width);
+        if (i % context_width > offset * 10 and i % context_width < offset * 10 + @divFloor(context.width, 10))
+            a.* = 0xFFFFFFFF;
+    }
+    context.surface.attach(context.buffer, 0, 0);
+    context.surface.damageBuffer(offset * 10 - 10, 0, @divFloor(context.width, 10) * 2, context.height);
+    context.surface.commit();
+}
+
+fn layerSurfaceListener(
+    surface: *zwlr.LayerSurfaceV1,
+    event: zwlr.LayerSurfaceV1.Event,
+    context: *Context,
+) void {
+    switch (event) {
+        .configure => |configure| {
+            surface.ackConfigure(configure.serial);
+
+            context.buffer = blk: {
+                const width: i32 = @intCast((configure.width));
+                const height: i32 = @intCast((configure.height));
+
+                context.width = width;
+                context.height = height;
+
+                const stride: i32 = width * 4;
+                const size: i32 = stride * height;
+                const sizeu = configure.width * configure.height * 4;
+
+                const fd = posix.memfd_create("zayneko", 0) catch return;
+                posix.ftruncate(fd, sizeu) catch return;
+
+                const tmp align(@alignOf(u32)) = posix.mmap(null, sizeu, posix.PROT.READ | posix.PROT.WRITE, .{ .TYPE = .SHARED }, fd, 0) catch return;
+
+                context.blk = mem.bytesAsSlice(u32, tmp);
+
+                const pool = context.shm.?.createPool(fd, size) catch return;
+
+                defer pool.destroy();
+
+                break :blk pool.createBuffer(0, width, height, stride, .argb8888) catch null;
+            };
+            context.surface.attach(context.buffer, 0, 0);
+            context.surface.commit();
+        },
+        .closed => {},
+    }
+}

src/root.zig

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+//! By convention, root.zig is the root source file when making a library. If
+//! you are making an executable, the convention is to delete this file and
+//! start with main.zig instead.
+const std = @import("std");
+const testing = std.testing;
+
+pub export fn add(a: i32, b: i32) i32 {
+    return a + b;
+}
+
+test "basic add functionality" {
+    try testing.expect(add(3, 7) == 10);
+}