ImGui demo window

cimgui/build.zig

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+const std = @import("std");
+const vkgen = @import("vulkan-zig");
+
+pub fn build(b: *std.Build) !void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const imgui_dep = b.dependency("imgui", .{});
+    const cimgui_dep = b.dependency("cimgui", .{});
+
+    const luajit = try b.findProgram(&.{"luajit"}, &.{});
+
+    const gen = b.addSystemCommand(&.{luajit});
+    gen.setCwd(cimgui_dep.path("generator/"));
+    gen.addFileArg(cimgui_dep.path("generator/generator.lua"));
+    gen.addArgs(&.{
+        "zig cc",
+        "comments internal noimstrv",
+        "glfw",
+        "vulkan",
+    });
+    _ = gen.captureStdOut(); // to quiet output
+
+    {
+        const relpath = try std.fs.path.relative(
+            b.allocator,
+            cimgui_dep.path("generator").getPath(b),
+            imgui_dep.path("").getPath(b),
+        );
+        defer b.allocator.free(relpath);
+        gen.setEnvironmentVariable(
+            "IMGUI_PATH",
+            relpath,
+        );
+    }
+
+    const copy = b.addWriteFiles();
+    copy.step.dependOn(&gen.step);
+    _ = copy.addCopyDirectory(imgui_dep.path(""), "imgui", .{
+        .include_extensions = &.{ ".h", ".cpp" },
+    });
+    _ = copy.addCopyFile(cimgui_dep.path("cimgui.h"), "cimgui.h");
+    _ = copy.addCopyFile(cimgui_dep.path("cimgui.cpp"), "cimgui.cpp");
+    _ = copy.addCopyFile(cimgui_dep.path("generator/output/cimgui_impl.h"), "cimgui_impl.h");
+
+    const cimgui = b.addSharedLibrary(.{
+        .name = "cimgui",
+        .target = target,
+        .optimize = optimize,
+    });
+    cimgui.step.dependOn(&copy.step);
+    cimgui.linkLibC();
+    cimgui.linkLibCpp();
+    cimgui.addIncludePath(copy.getDirectory());
+    cimgui.addIncludePath(copy.getDirectory().path(b, "imgui"));
+    cimgui.addCSourceFiles(.{
+        .root = copy.getDirectory(),
+        .files = &.{
+            "cimgui.cpp",
+            "imgui/imgui.cpp",
+            "imgui/imgui_tables.cpp",
+            "imgui/imgui_widgets.cpp",
+            "imgui/imgui_demo.cpp",
+            "imgui/imgui_draw.cpp",
+            "imgui/backends/imgui_impl_glfw.cpp",
+            "imgui/backends/imgui_impl_vulkan.cpp",
+        },
+        .flags = &.{
+            "-DIMGUI_IMPL_VULKAN_NO_PROTOTYPES",
+            "-DCIMGUI_USE_GLFW",
+            "-DCIMGUI_USE_VULKAN",
+            "-DIMGUI_IMPL_API=extern \"C\"",
+        },
+    });
+    cimgui.installHeader(copy.getDirectory().path(b, "cimgui.h"), "cimgui.h");
+    cimgui.installHeader(copy.getDirectory().path(b, "cimgui_impl.h"), "cimgui_impl.h");
+
+    // todo separate impls into different shared libraries for easier linkage
+    cimgui.linkSystemLibrary2("glfw3", .{
+        .needed = true,
+        .preferred_link_mode = .static,
+        .use_pkg_config = .force,
+    });
+
+    b.installArtifact(cimgui);
+
+    const cimgui_mod = b.addModule("cimgui", .{
+        .target = target,
+        .optimize = optimize,
+        .root_source_file = b.path("src/root.zig"),
+    });
+    cimgui_mod.linkLibrary(cimgui);
+}

cimgui/build.zig.zon

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+.{
+    .name = "cimgui",
+    .version = "0.0.0",
+
+    .dependencies = .{
+        .cimgui = .{
+            .url = "https://github.com/cimgui/cimgui/archive/refs/tags/1.90.8dock.tar.gz",
+            .hash = "12207ee69164f88f4b41ee5d44edf3835ec4dab0c0cd885799da67d56668f4a3d46b",
+        },
+        .imgui = .{
+            .url = "https://github.com/ocornut/imgui/archive/refs/tags/v1.90.8-docking.tar.gz",
+            .hash = "122065151b97161e25abb71c9df2fd9fba42aaca8c33d689a480b883d82411c8fabe",
+        },
+    },
+
+    .paths = .{
+        "",
+    },
+}

cimgui/src/root.zig

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+pub const c = @cImport({
+    @cDefine("CIMGUI_DEFINE_ENUMS_AND_STRUCTS", {});
+    @cInclude("cimgui.h");
+
+    @cInclude("vulkan/vulkan.h");
+
+    @cDefine("CIMGUI_USE_VULKAN", {});
+    @cDefine("CIMGUI_USE_GLFW", {});
+    @cInclude("cimgui_impl.h");
+});