91 lines
3.7 KiB
Zig
91 lines
3.7 KiB
Zig
const std = @import("std");
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const Build = std.Build;
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const OptimizeMode = std.builtin.OptimizeMode;
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const ResolvedTarget = Build.ResolvedTarget;
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const Dependency = Build.Dependency;
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const sokol = @import("sokol");
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pub fn build(b: *Build) !void {
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const target = b.standardTargetOptions(.{});
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const optimize = b.standardOptimizeOption(.{});
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// note that the sokol dependency is built with `.with_imgui_sokol = true`
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const dep_sokol = b.dependency("sokol", .{
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.target = target,
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.optimize = optimize,
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.with_sokol_imgui = true,
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});
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const dep_cimgui = b.dependency("cimgui", .{
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.target = target,
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.optimize = optimize,
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});
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// inject the cimgui header search path into the sokol C library compile step
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const cimgui_root = dep_cimgui.namedWriteFiles("cimgui").getDirectory();
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dep_sokol.artifact("sokol_clib").addIncludePath(cimgui_root);
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// from here on different handling for native vs wasm builds
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if (target.result.isWasm()) {
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try buildWasm(b, target, optimize, dep_sokol, dep_cimgui);
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} else {
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try buildNative(b, target, optimize, dep_sokol, dep_cimgui);
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}
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}
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fn buildNative(b: *Build, target: ResolvedTarget, optimize: OptimizeMode, dep_sokol: *Dependency, dep_cimgui: *Dependency) !void {
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const demo = b.addExecutable(.{
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.name = "demo",
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.root_source_file = b.path("src/main.zig"),
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.target = target,
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.optimize = optimize,
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});
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demo.root_module.addImport("sokol", dep_sokol.module("sokol"));
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demo.root_module.addImport("cimgui", dep_cimgui.module("cimgui"));
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b.installArtifact(demo);
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b.step("run", "Run demo").dependOn(&b.addRunArtifact(demo).step);
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}
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fn buildWasm(b: *Build, target: ResolvedTarget, optimize: OptimizeMode, dep_sokol: *Dependency, dep_cimgui: *Dependency) !void {
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// build the main file into a library, this is because the WASM 'exe'
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// needs to be linked in a separate build step with the Emscripten linker
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const demo = b.addStaticLibrary(.{
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.name = "demo",
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.root_source_file = b.path("src/main.zig"),
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.target = target,
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.optimize = optimize,
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});
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demo.root_module.addImport("sokol", dep_sokol.module("sokol"));
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demo.root_module.addImport("cimgui", dep_cimgui.module("cimgui"));
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// get the Emscripten SDK dependency from the sokol dependency
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const dep_emsdk = dep_sokol.builder.dependency("emsdk", .{});
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// need to inject the Emscripten system header include path into
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// the cimgui C library otherwise the C/C++ code won't find
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// C stdlib headers
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const emsdk_incl_path = dep_emsdk.path("upstream/emscripten/cache/sysroot/include");
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dep_cimgui.artifact("cimgui_clib").addSystemIncludePath(emsdk_incl_path);
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// all C libraries need to depend on the sokol library, when building for
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// WASM this makes sure that the Emscripten SDK has been setup before
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// C compilation is attempted (since the sokol C library depends on the
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// Emscripten SDK setup step)
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dep_cimgui.artifact("cimgui_clib").step.dependOn(&dep_sokol.artifact("sokol_clib").step);
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// create a build step which invokes the Emscripten linker
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const link_step = try sokol.emLinkStep(b, .{
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.lib_main = demo,
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.target = target,
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.optimize = optimize,
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.emsdk = dep_emsdk,
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.use_webgl2 = true,
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.use_emmalloc = true,
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.use_filesystem = false,
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.shell_file_path = dep_sokol.path("src/sokol/web/shell.html").getPath(b),
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});
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// ...and a special run step to start the web build output via 'emrun'
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const run = sokol.emRunStep(b, .{ .name = "demo", .emsdk = dep_emsdk });
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run.step.dependOn(&link_step.step);
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b.step("run", "Run demo").dependOn(&run.step);
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}
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