mirror of https://github.com/sotrh/learn-wgpu
using anyhow instead of failure
Ben Hansen
4 years ago
parent
3f2607e663
commit
e9e325459d
@ -0,0 +1,74 @@
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use glob::glob;
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use anyhow::*;
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use std::fs::{read_to_string, write};
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use std::path::{PathBuf};
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struct ShaderData {
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src: String,
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src_path: PathBuf,
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spv_path: PathBuf,
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kind: shaderc::ShaderKind,
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}
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impl ShaderData {
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pub fn load(src_path: PathBuf) -> Result<Self> {
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let extension = src_path.extension()
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.context("File has no extension")?
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.to_str()
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.context("Extension cannot be converted to &str")?;
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let kind = match extension {
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"vert" => shaderc::ShaderKind::Vertex,
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"frag" => shaderc::ShaderKind::Fragment,
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"comp" => shaderc::ShaderKind::Compute,
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_ => bail!("Unsupported shader: {}", src_path.display()),
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};
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let src = read_to_string(src_path.clone())?;
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let spv_path = src_path.with_extension(format!("{}.spv", extension));
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Ok(Self { src, src_path, spv_path, kind })
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}
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}
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fn main() -> Result<()> {
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// This tells cargo to rerun this script if something in /src/ changes.
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println!("cargo:rerun-if-changed=src/*");
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// Collect all shaders recursively within /src/
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let mut shader_paths = [
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glob("./src/**/*.vert")?,
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glob("./src/**/*.frag")?,
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glob("./src/**/*.comp")?,
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];
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// This could be parallelized
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let shaders = shader_paths.iter_mut()
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.flatten()
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.map(|glob_result| {
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ShaderData::load(glob_result?)
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})
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.collect::<Vec<Result<_>>>()
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.into_iter()
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.collect::<Result<Vec<_>>>();
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let mut compiler = shaderc::Compiler::new()
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.context("Unable to create shader compiler")?;
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// This can't be parallelized. The [shaderc::Compiler] is not
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// thread safe. Also, it creates a lot of resources. You could
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// spawn multiple processes to handle this, but it would probably
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// be better just to only compile shaders that have been changed
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// recently.
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for shader in shaders? {
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let compiled = compiler.compile_into_spirv(
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&shader.src,
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shader.kind,
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&shader.src_path.to_str().unwrap(),
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"main",
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None
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)?;
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write(shader.spv_path, compiled.as_binary_u8())?;
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}
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Ok(())
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}
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