Function copy_glsl

src/shader_build.rs:673–688

Copies a `.glsl` or `.frag` file to the output directory, adding the generated header.

(source: &Path, rel_path: &Path, output_dir: &Path)

/// Copies a `.glsl` or `.frag` file to the output directory, adding the generated header.
fn copy_glsl(source: &Path, rel_path: &Path, output_dir: &Path) {
    let stem = rel_path.file_stem().unwrap().to_string_lossy();
    let output_path = output_dir.join(format!("{}.frag.glsl", stem));

    let content = std::fs::read_to_string(source)
        .unwrap_or_else(|e| panic!("Failed to read '{}': {}", source.display(), e));

    let header = format!(
        "{}\n//! Source: {}\n",
        GENERATED_HEADER_PREFIX,
        rel_path.display()
    );

    std::fs::write(&output_path, format!("{}{}", header, content))
        .unwrap_or_else(|e| panic!("Failed to write '{}': {}", output_path.display(), e));
}

/// Prepends the generated file header to an existing compiled shader.
#[cfg(feature = "shader-build")]