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|
const std = @import("std");
const NativeTargetInfo = std.zig.system.NativeTargetInfo;
pub fn build(b: *std.Build) !void {
const target = b.standardTargetOptions(.{});
const optimize = b.standardOptimizeOption(.{});
const freetype = b.option(bool, "freetype", "Use Freetype") orelse false;
const backend_opengl3 = b.option(bool, "backend-opengl3", "OpenGL3 backend") orelse false;
const backend_metal = b.option(bool, "backend-metal", "Metal backend") orelse false;
const backend_osx = b.option(bool, "backend-osx", "OSX backend") orelse false;
// Build options
const options = b.addOptions();
options.addOption(bool, "freetype", freetype);
options.addOption(bool, "backend_opengl3", backend_opengl3);
options.addOption(bool, "backend_metal", backend_metal);
options.addOption(bool, "backend_osx", backend_osx);
// Main static lib
const lib = b.addLibrary(.{
.name = "dcimgui",
.root_module = b.createModule(.{
.target = target,
.optimize = optimize,
.link_libc = true,
// On MSVC, we must not use linkLibCpp because Zig unconditionally
// passes -nostdinc++ and then adds its bundled libc++/libc++abi
// include paths, which conflict with MSVC's own C++ runtime
// headers. The MSVC SDK include directories (added via linkLibC)
// contain both C and C++ headers, so linkLibCpp is not needed.
.link_libcpp = target.result.abi != .msvc,
}),
.linkage = .static,
});
b.installArtifact(lib);
// Zig module
const mod = b.addModule("dcimgui", .{
.root_source_file = b.path("main.zig"),
.target = target,
.optimize = optimize,
});
mod.addOptions("build_options", options);
mod.linkLibrary(lib);
// We need to add proper Apple SDKs to find stdlib headers
if (target.result.os.tag.isDarwin()) {
if (!target.query.isNative()) {
try @import("apple_sdk").addPaths(b, lib);
}
}
// Flags for C compilation, common to all.
var flags: std.ArrayList([]const u8) = .empty;
defer flags.deinit(b.allocator);
try flags.appendSlice(b.allocator, &.{
"-DIMGUI_HAS_DOCK=1",
"-DIMGUI_USE_WCHAR32=1",
"-DIMGUI_DISABLE_OBSOLETE_FUNCTIONS=1",
});
if (target.result.abi == .msvc) {
try flags.appendSlice(b.allocator, &.{
"-fno-sanitize=undefined",
"-fno-sanitize-trap=undefined",
});
}
if (freetype) try flags.appendSlice(b.allocator, &.{
"-DIMGUI_ENABLE_FREETYPE=1",
});
if (backend_opengl3) try flags.appendSlice(b.allocator, &.{
"-DZIGPKG_IMGUI_ENABLE_OPENGL3=1",
});
if (target.result.os.tag == .windows) {
try flags.appendSlice(b.allocator, &.{
"-DIMGUI_IMPL_API=extern\t\"C\"\t__declspec(dllexport)",
});
} else {
try flags.appendSlice(b.allocator, &.{
"-DIMGUI_IMPL_API=extern\t\"C\"",
});
}
if (target.result.os.tag == .freebsd or target.result.abi == .musl) {
try flags.append(b.allocator, "-fPIC");
}
// Add the core Dear Imgui source files
if (b.lazyDependency("imgui", .{})) |upstream| {
lib.root_module.addIncludePath(upstream.path(""));
lib.root_module.addCSourceFiles(.{
.root = upstream.path(""),
.files = &.{
"imgui_demo.cpp",
"imgui_draw.cpp",
"imgui_tables.cpp",
"imgui_widgets.cpp",
"imgui.cpp",
},
.flags = flags.items,
});
lib.installHeadersDirectory(
upstream.path(""),
"",
.{ .include_extensions = &.{".h"} },
);
if (freetype) {
lib.root_module.addCSourceFile(.{
.file = upstream.path("misc/freetype/imgui_freetype.cpp"),
.flags = flags.items,
});
if (b.systemIntegrationOption("freetype", .{})) {
lib.root_module.linkSystemLibrary("freetype2", dynamic_link_opts);
} else {
const freetype_dep = b.dependency("freetype", .{
.target = target,
.optimize = optimize,
.@"enable-libpng" = true,
});
lib.root_module.linkLibrary(freetype_dep.artifact("freetype"));
if (freetype_dep.builder.lazyDependency(
"freetype",
.{},
)) |freetype_upstream| {
mod.addIncludePath(freetype_upstream.path("include"));
}
}
}
if (backend_metal) {
lib.root_module.addCSourceFiles(.{
.root = upstream.path("backends"),
.files = &.{"imgui_impl_metal.mm"},
.flags = flags.items,
});
lib.installHeadersDirectory(
upstream.path("backends"),
"",
.{ .include_extensions = &.{"imgui_impl_metal.h"} },
);
}
if (backend_osx) {
lib.root_module.addCSourceFiles(.{
.root = upstream.path("backends"),
.files = &.{"imgui_impl_osx.mm"},
.flags = flags.items,
});
lib.installHeadersDirectory(
upstream.path("backends"),
"",
.{ .include_extensions = &.{"imgui_impl_osx.h"} },
);
}
if (backend_opengl3) {
lib.root_module.addCSourceFiles(.{
.root = upstream.path("backends"),
.files = &.{"imgui_impl_opengl3.cpp"},
.flags = flags.items,
});
lib.installHeadersDirectory(
upstream.path("backends"),
"",
.{ .include_extensions = &.{"imgui_impl_opengl3.h"} },
);
}
}
// Add the C bindings
if (b.lazyDependency("bindings", .{})) |upstream| {
lib.root_module.addIncludePath(upstream.path(""));
lib.root_module.addCSourceFiles(.{
.root = upstream.path(""),
.files = &.{
"dcimgui.cpp",
"dcimgui_internal.cpp",
},
.flags = flags.items,
});
lib.root_module.addCSourceFiles(.{
.root = b.path(""),
.files = &.{"ext.cpp"},
.flags = flags.items,
});
lib.installHeadersDirectory(
upstream.path(""),
"",
.{ .include_extensions = &.{".h"} },
);
}
const test_exe = b.addTest(.{
.name = "test",
.root_module = b.createModule(.{
.root_source_file = b.path("main.zig"),
.target = target,
.optimize = optimize,
}),
});
test_exe.root_module.addOptions("build_options", options);
test_exe.root_module.linkLibrary(lib);
const tests_run = b.addRunArtifact(test_exe);
const test_step = b.step("test", "Run tests");
test_step.dependOn(&tests_run.step);
}
// For dynamic linking, we prefer dynamic linking and to search by
// mode first. Mode first will search all paths for a dynamic library
// before falling back to static.
const dynamic_link_opts: std.Build.Module.LinkSystemLibraryOptions = .{
.preferred_link_mode = .dynamic,
.search_strategy = .mode_first,
};
|
