Revert "build glfw"

This reverts commit f0e7be542b.

build.zig

@@ -1,30 +1,25 @@
 const std = @import("std");
 const vkgen = @import("vulkan-zig");
-const glfw_util = @import("glfw");
 
 pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
-    const optimize = b.standardOptimizeOption(.{});
 
-    const glfw_dep = b.dependency("glfw", .{});
-    glfw_util.install(glfw_dep, b);
+    const optimize = b.standardOptimizeOption(.{});
 
     const vk = b.dependency("vulkan-zig", .{
         .registry = @as([]const u8, b.pathFromRoot("reg/vk.xml")),
     });
+    const vkmod = vk.module("vulkan-zig");
 
     const cimgui = b.dependency("cimgui", .{});
 
     const exe = b.addExecutable(.{
-        .name = "zig-glfw-vulkan",
+        .name = "scratchzig",
         .root_source_file = b.path("src/main.zig"),
         .target = target,
         .optimize = optimize,
     });
-    exe.root_module.addImport("vk", vk.module("vulkan-zig"));
     exe.root_module.addImport("cimgui", cimgui.module("cimgui"));
-    glfw_util.link(glfw_dep, exe);
-    b.installArtifact(exe);
 
     const shaders = vkgen.ShaderCompileStep.create(
         b,
@@ -35,6 +30,18 @@ pub fn build(b: *std.Build) void {
     shaders.add("triangle_frag", "src/shaders/triangle.frag", .{});
     exe.root_module.addImport("shaders", shaders.getModule());
 
+    // this requires PKG_CONFIG_PATH to be set. something like:
+    //  ~/.local/lib/pkgconfig/
+    exe.linkSystemLibrary2("glfw3", .{
+        .needed = true,
+        .preferred_link_mode = .static,
+        .use_pkg_config = .force,
+    });
+    exe.linkLibC();
+    exe.root_module.addImport("vk", vkmod);
+
+    b.installArtifact(exe);
+
     const run_cmd = b.addRunArtifact(exe);
     run_cmd.step.dependOn(b.getInstallStep());
 
@@ -44,4 +51,51 @@ pub fn build(b: *std.Build) void {
 
     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,
+    });
+    exe_unit_tests.linkSystemLibrary2("glfw3", .{
+        .needed = true,
+        .preferred_link_mode = .static,
+        .use_pkg_config = .force,
+    });
+    exe_unit_tests.linkLibC();
+    const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
+
+    const dsa_unit_tests = b.addTest(.{
+        .name = "dsa.zig tests",
+        .root_source_file = b.path("src/dsa.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+    const run_dsa_unit_tests = b.addRunArtifact(dsa_unit_tests);
+
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&run_exe_unit_tests.step);
+    test_step.dependOn(&run_dsa_unit_tests.step);
+
+    const inspect = b.addExecutable(.{
+        .name = "vkinspect",
+        .root_source_file = b.path("src/inspect.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+    inspect.linkSystemLibrary2("vulkan", .{
+        .needed = true,
+        .preferred_link_mode = .dynamic,
+    });
+    inspect.linkSystemLibrary2("glfw3", .{
+        .needed = true,
+        .preferred_link_mode = .static,
+        .use_pkg_config = .force,
+    });
+    exe_unit_tests.linkLibC();
+    inspect.root_module.addImport("vk", vkmod);
+    inspect.linkLibC();
+    const run_inspect = b.addRunArtifact(inspect);
+    const inspect_step = b.step("vki", "Vulkan Inspect");
+    inspect_step.dependOn(&run_inspect.step);
 }