1#![cfg_attr(any(not(target_os = "macos"), feature = "macos-blade"), allow(unused))]
2
3use std::{
4 env,
5 path::{Path, PathBuf},
6};
7
8use cbindgen::Config;
9
10//TODO: consider generating shader code for WGSL
11//TODO: deprecate "runtime-shaders" and "macos-blade"
12
13fn main() {
14 #[cfg(target_os = "macos")]
15 generate_dispatch_bindings();
16 #[cfg(all(target_os = "macos", not(feature = "macos-blade")))]
17 let header_path = generate_shader_bindings();
18 #[cfg(all(target_os = "macos", not(feature = "macos-blade")))]
19 #[cfg(feature = "runtime_shaders")]
20 emit_stitched_shaders(&header_path);
21 #[cfg(all(target_os = "macos", not(feature = "macos-blade")))]
22 #[cfg(not(feature = "runtime_shaders"))]
23 compile_metal_shaders(&header_path);
24}
25
26fn generate_dispatch_bindings() {
27 println!("cargo:rustc-link-lib=framework=System");
28 println!("cargo:rerun-if-changed=src/platform/mac/dispatch.h");
29
30 let bindings = bindgen::Builder::default()
31 .header("src/platform/mac/dispatch.h")
32 .allowlist_var("_dispatch_main_q")
33 .allowlist_var("_dispatch_source_type_data_add")
34 .allowlist_var("DISPATCH_QUEUE_PRIORITY_DEFAULT")
35 .allowlist_var("DISPATCH_QUEUE_PRIORITY_HIGH")
36 .allowlist_var("DISPATCH_TIME_NOW")
37 .allowlist_function("dispatch_get_global_queue")
38 .allowlist_function("dispatch_async_f")
39 .allowlist_function("dispatch_after_f")
40 .allowlist_function("dispatch_time")
41 .allowlist_function("dispatch_source_merge_data")
42 .allowlist_function("dispatch_source_create")
43 .allowlist_function("dispatch_source_set_event_handler_f")
44 .allowlist_function("dispatch_resume")
45 .allowlist_function("dispatch_suspend")
46 .allowlist_function("dispatch_source_cancel")
47 .allowlist_function("dispatch_set_context")
48 .parse_callbacks(Box::new(bindgen::CargoCallbacks))
49 .layout_tests(false)
50 .generate()
51 .expect("unable to generate bindings");
52
53 let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
54 bindings
55 .write_to_file(out_path.join("dispatch_sys.rs"))
56 .expect("couldn't write dispatch bindings");
57}
58
59fn generate_shader_bindings() -> PathBuf {
60 let output_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("scene.h");
61 let crate_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
62 let mut config = Config::default();
63 config.include_guard = Some("SCENE_H".into());
64 config.language = cbindgen::Language::C;
65 config.export.include.extend([
66 "Bounds".into(),
67 "Corners".into(),
68 "Edges".into(),
69 "Size".into(),
70 "Pixels".into(),
71 "PointF".into(),
72 "Hsla".into(),
73 "ContentMask".into(),
74 "Uniforms".into(),
75 "AtlasTile".into(),
76 "PathRasterizationInputIndex".into(),
77 "PathVertex_ScaledPixels".into(),
78 "ShadowInputIndex".into(),
79 "Shadow".into(),
80 "QuadInputIndex".into(),
81 "Underline".into(),
82 "UnderlineInputIndex".into(),
83 "Quad".into(),
84 "SpriteInputIndex".into(),
85 "MonochromeSprite".into(),
86 "PolychromeSprite".into(),
87 "PathSprite".into(),
88 "SurfaceInputIndex".into(),
89 "SurfaceBounds".into(),
90 ]);
91 config.no_includes = true;
92 config.enumeration.prefix_with_name = true;
93
94 let mut builder = cbindgen::Builder::new();
95
96 let src_paths = [
97 crate_dir.join("src/scene.rs"),
98 crate_dir.join("src/geometry.rs"),
99 crate_dir.join("src/color.rs"),
100 crate_dir.join("src/window.rs"),
101 crate_dir.join("src/platform.rs"),
102 crate_dir.join("src/platform/mac/metal_renderer.rs"),
103 ];
104 for src_path in src_paths {
105 println!("cargo:rerun-if-changed={}", src_path.display());
106 builder = builder.with_src(src_path);
107 }
108
109 builder
110 .with_config(config)
111 .generate()
112 .expect("Unable to generate bindings")
113 .write_to_file(&output_path);
114
115 output_path
116}
117
118/// To enable runtime compilation, we need to "stitch" the shaders file with the generated header
119/// so that it is self-contained.
120#[cfg(feature = "runtime_shaders")]
121fn emit_stitched_shaders(header_path: &Path) {
122 use std::str::FromStr;
123 fn stitch_header(header: &Path, shader_path: &Path) -> std::io::Result<PathBuf> {
124 let header_contents = std::fs::read_to_string(header)?;
125 let shader_contents = std::fs::read_to_string(shader_path)?;
126 let stitched_contents = format!("{header_contents}\n{shader_contents}");
127 let out_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("stitched_shaders.metal");
128 std::fs::write(&out_path, stitched_contents)?;
129 Ok(out_path)
130 }
131 let shader_source_path = "./src/platform/mac/shaders.metal";
132 let shader_path = PathBuf::from_str(shader_source_path).unwrap();
133 stitch_header(header_path, &shader_path).unwrap();
134 println!("cargo:rerun-if-changed={}", &shader_source_path);
135}
136#[cfg(not(feature = "runtime_shaders"))]
137fn compile_metal_shaders(header_path: &Path) {
138 use std::process::{self, Command};
139 let shader_path = "./src/platform/mac/shaders.metal";
140 let air_output_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("shaders.air");
141 let metallib_output_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("shaders.metallib");
142 println!("cargo:rerun-if-changed={}", shader_path);
143
144 let output = Command::new("xcrun")
145 .args([
146 "-sdk",
147 "macosx",
148 "metal",
149 "-gline-tables-only",
150 "-mmacosx-version-min=10.15.7",
151 "-MO",
152 "-c",
153 shader_path,
154 "-include",
155 &header_path.to_str().unwrap(),
156 "-o",
157 ])
158 .arg(&air_output_path)
159 .output()
160 .unwrap();
161
162 if !output.status.success() {
163 eprintln!(
164 "metal shader compilation failed:\n{}",
165 String::from_utf8_lossy(&output.stderr)
166 );
167 process::exit(1);
168 }
169
170 let output = Command::new("xcrun")
171 .args(["-sdk", "macosx", "metallib"])
172 .arg(air_output_path)
173 .arg("-o")
174 .arg(metallib_output_path)
175 .output()
176 .unwrap();
177
178 if !output.status.success() {
179 eprintln!(
180 "metallib compilation failed:\n{}",
181 String::from_utf8_lossy(&output.stderr)
182 );
183 process::exit(1);
184 }
185}