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use crate::*;
use std::{
fmt,
io::{BufRead, Error as ioError},
};
use super::{types::*, utils::*};
pub fn load_obj_mesh<EM, P, R>(read: &mut R, mesh: &mut EM) -> ObjResult<()>
where
EM: IsFaceEditableMesh<P, Face3> + IsVertexEditableMesh<P, Face3>,
P: IsBuildable3D + Clone,
R: BufRead,
{
let mut line_buffer = Vec::new();
let mut i_line = 0;
while let Ok(line) = fetch_line(read, &mut line_buffer) {
i_line += 1;
if line.starts_with(b"v ") {
let mut words = to_words_skip_empty(line);
words.next().ok_or(ObjError::Vertex).line(i_line, line)?;
let x = words
.next()
.and_then(|w| from_ascii(w))
.ok_or(ObjError::Vertex)
.line(i_line, line)?;
let y = words
.next()
.and_then(|w| from_ascii(w))
.ok_or(ObjError::Vertex)
.line(i_line, line)?;
let z = words
.next()
.and_then(|w| from_ascii(w))
.ok_or(ObjError::Vertex)
.line(i_line, line)?;
mesh.add_vertex(P::new(x, y, z));
} else if line.starts_with(b"f ") {
let mut words = to_words_skip_empty(line);
words.next().ok_or(ObjError::Face).line(i_line, line)?;
let mut tmp = words.next().ok_or(ObjError::Face).line(i_line, line)?;
let a: usize = from_ascii(until_bytes(tmp, b'/'))
.ok_or(ObjError::Face)
.line(i_line, line)?;
tmp = words.next().ok_or(ObjError::Face).line(i_line, line)?;
let b: usize = from_ascii(until_bytes(tmp, b'/'))
.ok_or(ObjError::Face)
.line(i_line, line)?;
tmp = words.next().ok_or(ObjError::Face).line(i_line, line)?;
let c: usize = from_ascii(until_bytes(tmp, b'/'))
.ok_or(ObjError::Face)
.line(i_line, line)?;
mesh.try_add_connection(VId { val: a - 1 }, VId { val: b - 1 }, VId { val: c - 1 })
.or(Err(ObjError::InvalidMeshIndices))
.line(i_line, line)?;
}
}
Ok(())
}
pub fn load_obj_points<IP, P, R>(read: &mut R, ip: &mut IP) -> ObjResult<()>
where
IP: IsPushable<P>,
P: IsBuildable3D,
R: BufRead,
{
let mut line_buffer = Vec::new();
let mut i_line = 0;
while let Ok(line) = fetch_line(read, &mut line_buffer) {
i_line += 1;
if line.starts_with(b"v ") {
let mut words = to_words_skip_empty(line);
words.next().ok_or(ObjError::Vertex).line(i_line, line)?;
let x = words
.next()
.and_then(|w| from_ascii(w))
.ok_or(ObjError::Vertex)
.line(i_line, line)?;
let y = words
.next()
.and_then(|w| from_ascii(w))
.ok_or(ObjError::Vertex)
.line(i_line, line)?;
let z = words
.next()
.and_then(|w| from_ascii(w))
.ok_or(ObjError::Vertex)
.line(i_line, line)?;
ip.push(P::new(x, y, z));
}
}
Ok(())
}
pub enum ObjError {
AccessFile,
InvalidMeshIndices,
Face,
Vertex,
}
pub type ObjResult<T> = IOResult<T, ObjError>;
impl fmt::Debug for ObjError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Self::AccessFile => write!(f, "Unable to access file"),
Self::Face => write!(f, "Unable to parse face"),
Self::Vertex => write!(f, "Unable to parse vertex"),
Self::InvalidMeshIndices => write!(f, "File contains invalid mesh indices"),
}
}
}
impl fmt::Display for ObjError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", self)
}
}
impl From<ioError> for ObjError {
fn from(_error: ioError) -> Self {
ObjError::AccessFile
}
}