207 lines
8.4 KiB
Zig
207 lines
8.4 KiB
Zig
const std = @import("std");
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pub fn build(b: *std.Build) !void {
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const optimize = b.standardOptimizeOption(.{});
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const target = b.standardTargetOptions(.{});
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const gpu_dawn = @import("libs/mach-gpu-dawn/build.zig");
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const gpu = Sdk(.{
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.gpu_dawn = gpu_dawn,
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});
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const gpu_dawn_options = gpu_dawn.Options{
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.from_source = b.option(bool, "dawn-from-source", "Build Dawn from source") orelse false,
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.debug = b.option(bool, "dawn-debug", "Use a debug build of Dawn") orelse false,
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};
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const test_step = b.step("test", "Run library tests");
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test_step.dependOn(&(try gpu.testStep(b, optimize, target, .{ .gpu_dawn_options = gpu_dawn_options })).step);
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const example = b.addExecutable(.{
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.name = "gpu-hello-triangle",
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.root_source_file = .{ .path = "examples/main.zig" },
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.target = target,
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.optimize = optimize,
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});
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const glfw_dep = b.dependency("mach_glfw", .{
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.target = example.target,
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.optimize = example.optimize,
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});
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example.linkLibrary(glfw_dep.artifact("mach-glfw"));
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example.addModule("glfw", glfw_dep.module("mach-glfw"));
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example.addModule("gpu", gpu.module(b));
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try gpu.link(b, example, .{ .gpu_dawn_options = gpu_dawn_options });
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// TODO(build-system): package manager can't handle transitive deps like this, so we need to use
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// these explicitly here:
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@import("glfw").addPaths(example);
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if (example.target.toTarget().isDarwin()) xcode_frameworks.addPaths(b, example);
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example.linkLibrary(b.dependency("vulkan_headers", .{
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.target = example.target,
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.optimize = example.optimize,
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}).artifact("vulkan-headers"));
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b.installArtifact(example);
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const example_run_cmd = b.addRunArtifact(example);
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example_run_cmd.step.dependOn(b.getInstallStep());
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const example_run_step = b.step("run-example", "Run the example");
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example_run_step.dependOn(&example_run_cmd.step);
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}
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pub fn Sdk(comptime deps: anytype) type {
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return struct {
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pub fn testStep(b: *std.Build, optimize: std.builtin.OptimizeMode, target: std.zig.CrossTarget, options: Options) !*std.build.RunStep {
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const main_tests = b.addTest(.{
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.name = "gpu-tests",
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.root_source_file = .{ .path = sdkPath("/src/main.zig") },
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.target = target,
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.optimize = optimize,
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});
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try link(b, main_tests, options);
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b.installArtifact(main_tests);
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return b.addRunArtifact(main_tests);
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}
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pub const Options = struct {
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gpu_dawn_options: deps.gpu_dawn.Options = .{},
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};
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var _module: ?*std.build.Module = null;
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pub fn module(b: *std.Build) *std.build.Module {
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if (_module) |m| return m;
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_module = b.createModule(.{
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.source_file = .{ .path = sdkPath("/src/main.zig") },
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});
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return _module.?;
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}
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pub fn link(b: *std.Build, step: *std.build.CompileStep, options: Options) !void {
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if (step.target.toTarget().cpu.arch != .wasm32) {
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try deps.gpu_dawn.link(b, step, options.gpu_dawn_options);
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step.addCSourceFile(sdkPath("/src/mach_dawn.cpp"), &.{"-std=c++17"});
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step.addIncludePath(sdkPath("/src"));
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}
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}
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fn sdkPath(comptime suffix: []const u8) []const u8 {
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if (suffix[0] != '/') @compileError("suffix must be an absolute path");
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return comptime blk: {
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const root_dir = std.fs.path.dirname(@src().file) orelse ".";
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break :blk root_dir ++ suffix;
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};
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}
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};
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}
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// TODO(build-system): This is a workaround that we copy anywhere xcode_frameworks needs to be used.
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// With the Zig package manager, it should be possible to remove this entirely and instead just
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// write:
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//
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// ```
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// step.linkLibrary(b.dependency("xcode_frameworks", .{
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// .target = step.target,
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// .optimize = step.optimize,
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// }).artifact("xcode-frameworks"));
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// @import("xcode_frameworks").addPaths(step);
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// ```
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//
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// However, today this package cannot be imported with the Zig package manager due to `error: TarUnsupportedFileType`
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// which would be fixed by https://github.com/ziglang/zig/pull/15382 - so instead for now you must
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// copy+paste this struct into your `build.zig` and write:
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//
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// ```
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// try xcode_frameworks.addPaths(b, step);
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// ```
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const xcode_frameworks = struct {
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pub fn addPaths(b: *std.Build, step: *std.build.CompileStep) void {
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// branch: mach
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xEnsureGitRepoCloned(b.allocator, "https://github.com/hexops/xcode-frameworks", "723aa55e9752c8c6c25d3413722b5fe13d72ac4f", xSdkPath("/zig-cache/xcode_frameworks")) catch |err| @panic(@errorName(err));
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step.addFrameworkPath("zig-cache/xcode_frameworks/Frameworks");
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step.addSystemIncludePath("zig-cache/xcode_frameworks/include");
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step.addLibraryPath("zig-cache/xcode_frameworks/lib");
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}
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fn xEnsureGitRepoCloned(allocator: std.mem.Allocator, clone_url: []const u8, revision: []const u8, dir: []const u8) !void {
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if (xIsEnvVarTruthy(allocator, "NO_ENSURE_SUBMODULES") or xIsEnvVarTruthy(allocator, "NO_ENSURE_GIT")) {
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return;
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}
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xEnsureGit(allocator);
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if (std.fs.openDirAbsolute(dir, .{})) |_| {
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const current_revision = try xGetCurrentGitRevision(allocator, dir);
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if (!std.mem.eql(u8, current_revision, revision)) {
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// Reset to the desired revision
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xExec(allocator, &[_][]const u8{ "git", "fetch" }, dir) catch |err| std.debug.print("warning: failed to 'git fetch' in {s}: {s}\n", .{ dir, @errorName(err) });
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try xExec(allocator, &[_][]const u8{ "git", "checkout", "--quiet", "--force", revision }, dir);
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try xExec(allocator, &[_][]const u8{ "git", "submodule", "update", "--init", "--recursive" }, dir);
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}
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return;
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} else |err| return switch (err) {
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error.FileNotFound => {
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std.log.info("cloning required dependency..\ngit clone {s} {s}..\n", .{ clone_url, dir });
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try xExec(allocator, &[_][]const u8{ "git", "clone", "-c", "core.longpaths=true", clone_url, dir }, ".");
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try xExec(allocator, &[_][]const u8{ "git", "checkout", "--quiet", "--force", revision }, dir);
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try xExec(allocator, &[_][]const u8{ "git", "submodule", "update", "--init", "--recursive" }, dir);
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return;
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},
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else => err,
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};
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}
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fn xExec(allocator: std.mem.Allocator, argv: []const []const u8, cwd: []const u8) !void {
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var child = std.ChildProcess.init(argv, allocator);
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child.cwd = cwd;
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_ = try child.spawnAndWait();
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}
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fn xGetCurrentGitRevision(allocator: std.mem.Allocator, cwd: []const u8) ![]const u8 {
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const result = try std.ChildProcess.exec(.{ .allocator = allocator, .argv = &.{ "git", "rev-parse", "HEAD" }, .cwd = cwd });
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allocator.free(result.stderr);
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if (result.stdout.len > 0) return result.stdout[0 .. result.stdout.len - 1]; // trim newline
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return result.stdout;
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}
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fn xEnsureGit(allocator: std.mem.Allocator) void {
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const argv = &[_][]const u8{ "git", "--version" };
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const result = std.ChildProcess.exec(.{
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.allocator = allocator,
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.argv = argv,
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.cwd = ".",
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}) catch { // e.g. FileNotFound
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std.log.err("mach: error: 'git --version' failed. Is git not installed?", .{});
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std.process.exit(1);
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};
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defer {
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allocator.free(result.stderr);
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allocator.free(result.stdout);
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}
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if (result.term.Exited != 0) {
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std.log.err("mach: error: 'git --version' failed. Is git not installed?", .{});
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std.process.exit(1);
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}
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}
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fn xIsEnvVarTruthy(allocator: std.mem.Allocator, name: []const u8) bool {
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if (std.process.getEnvVarOwned(allocator, name)) |truthy| {
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defer allocator.free(truthy);
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if (std.mem.eql(u8, truthy, "true")) return true;
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return false;
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} else |_| {
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return false;
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}
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}
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fn xSdkPath(comptime suffix: []const u8) []const u8 {
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if (suffix[0] != '/') @compileError("suffix must be an absolute path");
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return comptime blk: {
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const root_dir = std.fs.path.dirname(@src().file) orelse ".";
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break :blk root_dir ++ suffix;
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};
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}
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};
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