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build.rs: don't build compile-shaders if shaders are unchanged

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This commit is contained in:
Julian Orth 2025-10-04 22:32:59 +02:00
parent d1910063d8
commit ee84b309ba
6 changed files with 43 additions and 40 deletions
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32
compile-shaders/core/src/lib.rs
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@ -1,36 +1,6 @@
use {std::fmt::Write, walkdir::WalkDir};
include!("../../../build/vulkan/hash.rs");
pub const ROOT: &str = "src/gfx_apis/vulkan/shaders";
pub const BIN: &str = "src/gfx_apis/vulkan/shaders_bin";
pub const HASH: &str = "src/gfx_apis/vulkan/shaders_hash.txt";
fn calculate_hash() -> anyhow::Result<String> {
let dir = WalkDir::new(ROOT);
let mut files = vec![];
for file in dir {
let file = file?;
if file.file_type().is_file() {
files.push(file.path().to_path_buf());
}
}
files.sort();
let mut out = String::new();
for file in files {
let data = std::fs::read(&file)?;
writeln!(out, "{} {}", blake3::hash(&data).to_hex(), file.display())?;
}
Ok(out)
}
pub fn unchanged() -> bool {
let Ok(actual) = std::fs::read_to_string(HASH) else {
return false;
};
let Ok(expected) = calculate_hash() else {
return false;
};
actual == expected
}
pub fn update_hash() -> anyhow::Result<()> {
std::fs::write(HASH, calculate_hash()?)?;