improving zig build

build.zig

@@ -1,29 +1,74 @@
 const std = @import("std");
+const Step = std.Build.Step;
 
-pub fn build(b: *std.Build) void {
+const ImplementationDesc = struct {
+    name: []const u8,
+    root_source_file: []const u8,
+};
+
+const implementations = [_]ImplementationDesc{
+    .{
+        .name = "soft",
+        .root_source_file = "src/soft/lib.zig",
+    },
+};
+
+pub fn build(b: *std.Build) !void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
-    const lib_mod = b.createModule(.{
-        .root_source_file = b.path("src/lib.zig"),
+    const libvulkan_mod = b.createModule(.{
+        .root_source_file = b.path("src/vulkan/lib.zig"),
         .target = target,
         .optimize = optimize,
     });
 
-    const lib = b.addLibrary(.{
+    const vulkan = b.dependency("vulkan_zig", .{
+        .registry = b.dependency("vulkan_headers", .{}).path("registry/vk.xml"),
+    }).module("vulkan-zig");
+
+    libvulkan_mod.addImport("vulkan", vulkan);
+
+    const libvulkan = b.addLibrary(.{
         .name = "vulkan",
-        .root_module = lib_mod,
+        .root_module = libvulkan_mod,
         .linkage = .dynamic,
     });
 
-    b.installArtifact(lib);
+    b.installArtifact(libvulkan);
 
-    const lib_tests = b.addTest(.{
-        .root_module = lib_mod,
+    for (implementations) |impl| {
+        b.installArtifact(try buildImplementation(b, target, optimize, &impl, vulkan));
+    }
+
+    const libvulkan_tests = b.addTest(.{
+        .root_module = libvulkan_mod,
     });
 
-    const run_lib_tests = b.addRunArtifact(lib_tests);
+    const run_libvulkan_tests = b.addRunArtifact(libvulkan_tests);
 
     const test_step = b.step("test", "Run tests");
-    test_step.dependOn(&run_lib_tests.step);
+    test_step.dependOn(&run_libvulkan_tests.step);
+}
+
+fn buildImplementation(
+    b: *std.Build,
+    target: std.Build.ResolvedTarget,
+    optimize: std.builtin.OptimizeMode,
+    desc: *const ImplementationDesc,
+    vulkan_bindings: *std.Build.Module,
+) !*Step.Compile {
+    const lib_mod = b.createModule(.{
+        .root_source_file = b.path(desc.root_source_file),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    lib_mod.addImport("vulkan", vulkan_bindings);
+
+    return b.addLibrary(.{
+        .name = try std.fmt.allocPrint(b.allocator, "vulkan_{s}", .{desc.name}),
+        .root_module = lib_mod,
+        .linkage = .dynamic,
+    });
 }