1#![cfg_attr(not(target_os = "macos"), allow(unused))]
2
3use std::{
4 env,
5 path::{Path, PathBuf},
6};
7
8use cbindgen::Config;
9
10fn main() {
11 #[cfg(target_os = "macos")]
12 generate_dispatch_bindings();
13 #[cfg(target_os = "macos")]
14 let header_path = generate_shader_bindings();
15 #[cfg(target_os = "macos")]
16 #[cfg(feature = "runtime_shaders")]
17 emit_stitched_shaders(&header_path);
18 #[cfg(target_os = "macos")]
19 #[cfg(not(feature = "runtime_shaders"))]
20 compile_metal_shaders(&header_path);
21}
22
23fn generate_dispatch_bindings() {
24 println!("cargo:rustc-link-lib=framework=System");
25 println!("cargo:rerun-if-changed=src/platform/mac/dispatch.h");
26
27 let bindings = bindgen::Builder::default()
28 .header("src/platform/mac/dispatch.h")
29 .allowlist_var("_dispatch_main_q")
30 .allowlist_var("_dispatch_source_type_data_add")
31 .allowlist_var("DISPATCH_QUEUE_PRIORITY_DEFAULT")
32 .allowlist_var("DISPATCH_QUEUE_PRIORITY_HIGH")
33 .allowlist_var("DISPATCH_TIME_NOW")
34 .allowlist_function("dispatch_get_global_queue")
35 .allowlist_function("dispatch_async_f")
36 .allowlist_function("dispatch_after_f")
37 .allowlist_function("dispatch_time")
38 .allowlist_function("dispatch_source_merge_data")
39 .allowlist_function("dispatch_source_create")
40 .allowlist_function("dispatch_source_set_event_handler_f")
41 .allowlist_function("dispatch_resume")
42 .allowlist_function("dispatch_suspend")
43 .allowlist_function("dispatch_source_cancel")
44 .allowlist_function("dispatch_set_context")
45 .parse_callbacks(Box::new(bindgen::CargoCallbacks))
46 .layout_tests(false)
47 .generate()
48 .expect("unable to generate bindings");
49
50 let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
51 bindings
52 .write_to_file(out_path.join("dispatch_sys.rs"))
53 .expect("couldn't write dispatch bindings");
54}
55
56fn generate_shader_bindings() -> PathBuf {
57 let output_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("scene.h");
58 let crate_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
59 let mut config = Config::default();
60 config.include_guard = Some("SCENE_H".into());
61 config.language = cbindgen::Language::C;
62 config.export.include.extend([
63 "Bounds".into(),
64 "Corners".into(),
65 "Edges".into(),
66 "Size".into(),
67 "Pixels".into(),
68 "PointF".into(),
69 "Hsla".into(),
70 "ContentMask".into(),
71 "Uniforms".into(),
72 "AtlasTile".into(),
73 "PathRasterizationInputIndex".into(),
74 "PathVertex_ScaledPixels".into(),
75 "ShadowInputIndex".into(),
76 "Shadow".into(),
77 "QuadInputIndex".into(),
78 "Underline".into(),
79 "UnderlineInputIndex".into(),
80 "Quad".into(),
81 "SpriteInputIndex".into(),
82 "MonochromeSprite".into(),
83 "PolychromeSprite".into(),
84 "PathSprite".into(),
85 "SurfaceInputIndex".into(),
86 "SurfaceBounds".into(),
87 ]);
88 config.no_includes = true;
89 config.enumeration.prefix_with_name = true;
90
91 let mut builder = cbindgen::Builder::new();
92
93 let src_paths = [
94 crate_dir.join("src/scene.rs"),
95 crate_dir.join("src/geometry.rs"),
96 crate_dir.join("src/color.rs"),
97 crate_dir.join("src/window.rs"),
98 crate_dir.join("src/platform.rs"),
99 crate_dir.join("src/platform/mac/metal_renderer.rs"),
100 ];
101 for src_path in src_paths {
102 println!("cargo:rerun-if-changed={}", src_path.display());
103 builder = builder.with_src(src_path);
104 }
105
106 builder
107 .with_config(config)
108 .generate()
109 .expect("Unable to generate bindings")
110 .write_to_file(&output_path);
111
112 output_path
113}
114
115/// To enable runtime compilation, we need to "stitch" the shaders file with the generated header
116/// so that it is self-contained.
117#[cfg(feature = "runtime_shaders")]
118fn emit_stitched_shaders(header_path: &Path) {
119 use std::str::FromStr;
120 fn stitch_header(header: &Path, shader_path: &Path) -> std::io::Result<PathBuf> {
121 let header_contents = std::fs::read_to_string(header)?;
122 let shader_contents = std::fs::read_to_string(shader_path)?;
123 let stitched_contents = format!("{header_contents}\n{shader_contents}");
124 let out_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("stitched_shaders.metal");
125 let _ = std::fs::write(&out_path, stitched_contents)?;
126 Ok(out_path)
127 }
128 let shader_source_path = "./src/platform/mac/shaders.metal";
129 let shader_path = PathBuf::from_str(shader_source_path).unwrap();
130 stitch_header(header_path, &shader_path).unwrap();
131 println!("cargo:rerun-if-changed={}", &shader_source_path);
132}
133#[cfg(not(feature = "runtime_shaders"))]
134fn compile_metal_shaders(header_path: &Path) {
135 use std::process::{self, Command};
136 let shader_path = "./src/platform/mac/shaders.metal";
137 let air_output_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("shaders.air");
138 let metallib_output_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("shaders.metallib");
139 println!("cargo:rerun-if-changed={}", shader_path);
140
141 let output = Command::new("xcrun")
142 .args([
143 "-sdk",
144 "macosx",
145 "metal",
146 "-gline-tables-only",
147 "-mmacosx-version-min=10.15.7",
148 "-MO",
149 "-c",
150 shader_path,
151 "-include",
152 &header_path.to_str().unwrap(),
153 "-o",
154 ])
155 .arg(&air_output_path)
156 .output()
157 .unwrap();
158
159 if !output.status.success() {
160 eprintln!(
161 "metal shader compilation failed:\n{}",
162 String::from_utf8_lossy(&output.stderr)
163 );
164 process::exit(1);
165 }
166
167 let output = Command::new("xcrun")
168 .args(["-sdk", "macosx", "metallib"])
169 .arg(air_output_path)
170 .arg("-o")
171 .arg(metallib_output_path)
172 .output()
173 .unwrap();
174
175 if !output.status.success() {
176 eprintln!(
177 "metallib compilation failed:\n{}",
178 String::from_utf8_lossy(&output.stderr)
179 );
180 process::exit(1);
181 }
182}