1 files changed, 142 insertions, 0 deletions
diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000..b4bb066
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,142 @@
+const std = @import("std");
+
+const ShaderStage = enum { fragment, vertex };
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const glfw = b.addStaticLibrary(.{
+        .name = "glfw",
+        .target = target,
+        .optimize = optimize,
+    });
+    glfw.addCSourceFiles(.{ .files = &[_][]const u8{
+        "ext/glfw/src/cocoa_init.m",
+        "ext/glfw/src/cocoa_joystick.m",
+        "ext/glfw/src/cocoa_monitor.m",
+        "ext/glfw/src/cocoa_time.c",
+        "ext/glfw/src/cocoa_window.m",
+        "ext/glfw/src/context.c",
+        "ext/glfw/src/egl_context.c",
+        "ext/glfw/src/glx_context.c",
+        "ext/glfw/src/init.c",
+        "ext/glfw/src/input.c",
+        "ext/glfw/src/linux_joystick.c",
+        "ext/glfw/src/monitor.c",
+        "ext/glfw/src/nsgl_context.m",
+        "ext/glfw/src/null_init.c",
+        "ext/glfw/src/null_joystick.c",
+        "ext/glfw/src/null_monitor.c",
+        "ext/glfw/src/null_window.c",
+        "ext/glfw/src/osmesa_context.c",
+        "ext/glfw/src/platform.c",
+        "ext/glfw/src/posix_module.c",
+        "ext/glfw/src/posix_poll.c",
+        "ext/glfw/src/posix_thread.c",
+        "ext/glfw/src/posix_time.c",
+        "ext/glfw/src/vulkan.c",
+        "ext/glfw/src/wgl_context.c",
+        "ext/glfw/src/win32_init.c",
+        "ext/glfw/src/win32_joystick.c",
+        "ext/glfw/src/win32_module.c",
+        "ext/glfw/src/win32_monitor.c",
+        "ext/glfw/src/win32_thread.c",
+        "ext/glfw/src/win32_time.c",
+        "ext/glfw/src/win32_window.c",
+        "ext/glfw/src/window.c",
+        "ext/glfw/src/wl_init.c",
+        "ext/glfw/src/wl_monitor.c",
+        "ext/glfw/src/wl_window.c",
+        "ext/glfw/src/x11_init.c",
+        "ext/glfw/src/x11_monitor.c",
+        "ext/glfw/src/x11_window.c",
+        "ext/glfw/src/xkb_unicode.c",
+    }, .flags = &[_][]const u8{ "-D_GLFW_X11", "-Wall", "-Wextra" } });
+    glfw.linkLibC();
+
+    const exe = b.addExecutable(.{
+        .root_source_file = b.path("src/main.zig"),
+        .target = target,
+        .optimize = optimize,
+        .name = "sideros",
+    });
+    exe.addIncludePath(b.path("ext/glfw/include"));
+
+    //  If "opengl" was passed as an option, this statement will define USE_OPENGL,
+    //  which will be checked inside renderer.zig, it will use the opengl backend if that was defined,
+    //  else it won't thus the backend will be vulkan
+    const opengl = b.option(bool, "opengl", "Use OpenGL instead of Vulkan.") orelse false;
+    const options = b.addOptions();
+    options.addOption(bool, "opengl", opengl);
+    exe.root_module.addOptions("config", options);
+    if (opengl) {
+        exe.addIncludePath(b.path("ext/gl/include"));
+        exe.addCSourceFile(.{
+            .file = b.path("ext/gl/src/glad.c"),
+            .flags = &[_][]const u8{"-Iinclude"},
+        });
+    } else {
+        exe.linkSystemLibrary("vulkan");
+        compileAllShaders(b, exe);
+    }
+    exe.linkLibrary(glfw);
+    exe.linkLibC();
+
+    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);
+}
+
+fn compileAllShaders(b: *std.Build, exe: *std.Build.Step.Compile) void {
+    const shaders_dir = if (@hasDecl(@TypeOf(b.build_root.handle), "openIterableDir"))
+        b.build_root.handle.openIterableDir("assets/shaders", .{}) catch @panic("Failed to open shaders directory")
+    else
+        b.build_root.handle.openDir("assets/shaders", .{ .iterate = true }) catch @panic("Failed to open shaders directory");
+
+    var file_it = shaders_dir.iterate();
+    while (file_it.next() catch @panic("Failed to iterate shader directory")) |entry| {
+        if (entry.kind == .file) {
+            const ext = std.fs.path.extension(entry.name);
+            const basename = std.fs.path.basename(entry.name);
+            const name = basename[0 .. basename.len - ext.len];
+            if (std.mem.eql(u8, ext, ".vert")) {
+                addShader(b, exe, name, .vertex);
+            } else if (std.mem.eql(u8, ext, ".frag")) {
+                addShader(b, exe, name, .fragment);
+            }
+        }
+    }
+}
+
+fn addShader(b: *std.Build, exe: *std.Build.Step.Compile, name: []const u8, stage: ShaderStage) void {
+    const mod_name = std.fmt.allocPrint(b.allocator, "{s}_{s}", .{ name, if (stage == .vertex) "vert" else "frag" }) catch @panic("");
+    const source = std.fmt.allocPrint(b.allocator, "assets/shaders/{s}.{s}", .{ name, if (stage == .vertex) "vert" else "frag" }) catch @panic("");
+    const outpath = std.fmt.allocPrint(b.allocator, "assets/shaders/{s}_{s}.spv", .{ name, if (stage == .vertex) "vert" else "frag" }) catch @panic("");
+
+    const shader_compilation = b.addSystemCommand(&.{"glslc"});
+    shader_compilation.addArg("-o");
+    const output = shader_compilation.addOutputFileArg(outpath);
+    shader_compilation.addFileArg(b.path(source));
+
+    exe.root_module.addAnonymousImport(mod_name, .{ .root_source_file = output });
+}