82 lines
2.1 KiB
Rust
82 lines
2.1 KiB
Rust
//! Module containing the parser for material files from Wavefront OBJ (mtl files).
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use std::path::PathBuf;
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use parser::{Element, ParserError, LineParser};
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use parser::obj::parse_values;
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use math::vector::Vector3;
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/// Wavefront material file format parser.
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pub struct MtlParser {
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}
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impl MtlParser {
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/// Creates a MtlParser.
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pub fn new() -> MtlParser {
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MtlParser {
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}
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}
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}
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impl LineParser for MtlParser {
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fn parse_line(&mut self, line_number: usize, line: &str, path: &str) -> Result<Element, ParserError> {
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let mut root = PathBuf::from(path);
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root.pop();
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let mut split = line.split_whitespace();
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if let Some(first) = split.nth(0) {
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let first = first.trim();
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match first {
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// Ignore comments
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"#" => Ok(Element::None),
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// Starts a new material
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"newmtl" => Ok(Element::NewMaterial(split.nth(0).unwrap().to_owned())),
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"Kd" => {
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let values = parse_values(line_number, line, path, 3)?;
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Ok(Element::Diffuse(Vector3::new(
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values[0] as f32,
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values[1] as f32,
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values[2] as f32,
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)))
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},
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map if map.starts_with("map_") => {
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let mut full_path = root.clone();
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full_path.push(split.nth(0).unwrap().to_owned());
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Ok(Element::Texture(first.to_owned(), full_path.to_str().unwrap().to_owned()))
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},
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// The keyword is not empty and unexpected
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// We don't do this : we simply return an unknown material instruction
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// key if key.len() != 0 => {
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// Err(ParserError::UnexpectedKeyword(path.to_owned(), line_number, key.to_owned()))
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// },
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// Empty string
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"" => Ok(Element::None),
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// Unknown instruction
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_ => Ok(Element::UnknownMaterialInstruction(line.to_owned())),
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}
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} else {
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Ok(Element::None)
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}
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}
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}
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