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use heck::ToUpperCamelCase;
use proc_macro::TokenStream;
use std::collections::HashSet;
use std::path::Path;
use walkdir::WalkDir;
#[derive(Debug, Hash, PartialEq, Eq)]
struct Designator {
path: String,
parts: Vec<String>,
}
impl Designator {
fn new(fbase: &str, mut path: &Path, shorten: bool) -> Self {
let mut parts: Vec<_> = path
.strip_prefix(fbase)
.unwrap()
.with_extension("")
.components()
.filter_map(|c| match c {
std::path::Component::Normal(o) => Some(o.to_str().unwrap().to_owned()),
_ => None,
})
.collect();
if shorten {
parts.pop();
path = path.parent().expect("path has no parent");
}
Self {
path: path
.to_str()
.expect("path is not a string")
.replace("\\", "/"),
parts,
}
}
fn enum_entry(&self, fnm: &str) -> String {
let singular = match fnm {
"meshes" => "mesh",
"textures" => "texture",
"materials" => "material",
"shaders" => "shader",
_ => fnm,
};
let mut ret = format!("\n#[doc=\"newton-{}: {}\"]\n", singular, self.path);
ret += &self.parts.join(" ").to_upper_camel_case();
ret
}
fn enum_element(&self, _fnm: &str) -> String {
self.parts.join(" ").to_upper_camel_case()
}
fn load_expr(&self, fnm: &str) -> Option<String> {
let i = format!("assets/{}/{}", fnm, self.parts.join("/"));
match fnm {
"meshes" => Some(format!(
"teleia::mesh::Mesh::from_obj(ctx, include_bytes!(\"{}.obj\"))",
i
)),
"textures" => Some(format!(
"teleia::texture::Texture::new(ctx, include_bytes!(\"{}.png\"))",
i
)),
"materials" => Some(format!(
"teleia::texture::Material::new(ctx, include_bytes!(\"{}/color.jpg\"), include_bytes!(\"{}/normal.jpg\"))",
i, i
)),
"shaders" => {
if self.parts.contains(&"nolib".to_owned()) {
Some(format!(
"teleia::shader::Shader::new_nolib(ctx, include_str!(\"{}/vert.glsl\"), include_str!(\"{}/frag.glsl\"))",
i, i
))
} else {
Some(format!(
"teleia::shader::Shader::new(ctx, include_str!(\"{}/vert.glsl\"), include_str!(\"{}/frag.glsl\"))",
i, i
))
}
}
_ => None,
}
}
}
#[derive(Debug)]
struct Field {
nm: String,
entries: HashSet<Designator>,
}
impl Field {
fn new(base: &str, nm: &str) -> Self {
let mut entries = HashSet::new();
let fbase = format!("{}{}", base, nm);
for f in WalkDir::new(&fbase).into_iter().flatten() {
if f.file_type().is_file() {
entries.insert(Designator::new(
&fbase,
f.path(),
nm == "shaders" || nm == "materials",
));
}
}
Self {
nm: nm.to_owned(),
entries,
}
}
fn generate(&self) -> Option<(String, String, String)> {
let mut ents = Vec::new();
for d in self.entries.iter() {
if let Some(exp) = d.load_expr(&self.nm) {
ents.push((d.enum_entry(&self.nm), d.enum_element(&self.nm), exp));
}
}
let (enm, ty) = match self.nm.as_str() {
"meshes" => ("Mesh", "teleia::mesh::Mesh"),
"textures" => ("Texture", "teleia::texture::Texture"),
"materials" => ("Material", "teleia::texture::Material"),
"shaders" => ("Shader", "teleia::shader::Shader"),
_ => return None,
};
let enums: Vec<_> = ents.iter().map(|(e, _, _)| e.clone()).collect();
let edecl = format!("#[derive(Debug, Clone, Copy, PartialEq, Eq, serde::Serialize, serde::Deserialize, enum_map::Enum)]
pub enum {} {{ {} }}", enm, enums.join(", "));
let decl = format!("pub {}: enum_map::EnumMap<{}, {}>", self.nm, enm, ty);
let inits: Vec<_> = ents
.into_iter()
.map(|(_, e, exp)| format!("{}::{} => {}", enm, e, exp))
.collect();
let init = format!("{}: enum_map::enum_map!({})", self.nm, inits.join(", "));
Some((edecl, decl, init))
}
}
#[derive(Debug)]
struct AssetData {
fields: Vec<Field>,
}
impl AssetData {
fn new(base: &str) -> Self {
let mut fields = Vec::new();
let dirs = std::fs::read_dir(base)
.unwrap_or_else(|_| panic!("failed to read assets directory: {}", base));
let (mut has_meshes, mut has_textures, mut has_materials, mut has_shaders) =
(false, false, false, false);
for d in dirs.flatten() {
let nm = d.file_name().into_string().unwrap();
fields.push(Field::new(base, &nm));
match &*nm {
"meshes" => has_meshes = true,
"textures" => has_textures = true,
"materials" => has_materials = true,
"shaders" => has_shaders = true,
_ => {}
};
}
if !has_meshes {
fields.push(Field {
nm: "meshes".to_owned(),
entries: HashSet::new(),
});
}
if !has_textures {
fields.push(Field {
nm: "textures".to_owned(),
entries: HashSet::new(),
});
}
if !has_materials {
fields.push(Field {
nm: "materials".to_owned(),
entries: HashSet::new(),
});
}
if !has_shaders {
fields.push(Field {
nm: "shaders".to_owned(),
entries: HashSet::new(),
});
}
Self { fields }
}
fn generate(&self) -> String {
let mut res = String::new();
let fdata: Vec<_> = self.fields.iter().filter_map(|f| f.generate()).collect();
for (edecl, _, _) in fdata.iter() {
res += edecl;
res += "\n";
}
res += "pub struct Assets {\n";
for (_, decl, _) in fdata.iter() {
res += decl;
res += ",\n";
}
res += "}\nimpl Assets {\npub fn new(ctx: &teleia::context::Context) -> Self {\nSelf {\n";
for (_, _, init) in fdata.iter() {
res += init;
res += ",\n";
}
res += "}\n}\n}\n";
res += "impl teleia::renderer::Assets for Assets {\n";
res += "type Shader = Shader;\n";
res +=
"fn shader(&self, i: Self::Shader) -> &teleia::shader::Shader { &self.shaders[i] }\n";
res += "type Texture = Texture;\n";
res += "fn texture(&self, i: Self::Texture) -> &teleia::texture::Texture { &self.textures[i] }\n";
res += "type Material = Material;\n";
res += "fn material(&self, i: Self::Material) -> &teleia::texture::Material { &self.materials[i] }\n";
res += "type Mesh = Mesh;\n";
res += "fn mesh(&self, i: Self::Mesh) -> &teleia::mesh::Mesh { &self.meshes[i] }\n";
res += "}\n";
res
}
}
#[proc_macro]
pub fn generate_assets(s: TokenStream) -> TokenStream {
let token = s
.into_iter()
.next()
.expect("must pass asset base path as a string literal");
let lit = litrs::StringLit::try_from(token).expect("argument was not a string literal");
let base = lit.value();
let manifest = env::var("CARGO_MANIFEST_DIR").expect("failed to get manifest path");
let assets = AssetData::new(&format!("{}/{}", manifest, base));
// println!("{}", assets.generate());
assets
.generate()
.to_string()
.parse()
.expect("failed to parse generate_assets result")
}
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