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use crate::definition::*;
use crate::io::*;
use std::collections::HashMap;
use std::path::Path;
impl<'a> Loaded<'a> {
pub fn obj<P: AsRef<Path>>(
&'a self,
path: P,
) -> Result<(Vec<CPUMesh>, Vec<CPUMaterial>), IOError> {
let obj_bytes = self.bytes(path.as_ref())?;
let obj = wavefront_obj::obj::parse(String::from_utf8(obj_bytes.to_owned()).unwrap())?;
let p = path.as_ref().parent().unwrap();
let mut cpu_materials = Vec::new();
if let Some(material_library) = obj.material_library {
let bytes = self
.bytes(p.join(material_library).to_str().unwrap())?
.to_owned();
let materials = wavefront_obj::mtl::parse(String::from_utf8(bytes).unwrap())?.materials;
for material in materials {
let color = if material.color_diffuse.r != material.color_diffuse.g
|| material.color_diffuse.g != material.color_diffuse.b
{
material.color_diffuse
} else if material.color_specular.r != material.color_specular.g
|| material.color_specular.g != material.color_specular.b
{
material.color_specular
} else if material.color_ambient.r != material.color_ambient.g
|| material.color_ambient.g != material.color_ambient.b
{
material.color_ambient
} else {
material.color_diffuse
};
let diffuse_intensity = (material.color_diffuse.r as f32)
.max(material.color_diffuse.g as f32)
.max(material.color_diffuse.b as f32);
let specular_intensity = (material.color_specular.r as f32)
.max(material.color_specular.g as f32)
.max(material.color_specular.b as f32);
cpu_materials.push(CPUMaterial {
name: material.name,
color: Some((
color.r as f32,
color.g as f32,
color.b as f32,
material.alpha as f32,
)),
diffuse_intensity: Some(diffuse_intensity),
specular_intensity: Some(specular_intensity),
specular_power: Some(material.specular_coefficient as f32),
texture_image: if let Some(path) = material
.diffuse_map
.as_ref()
.map(|texture_name| p.join(texture_name).to_str().unwrap().to_owned())
{
Some(self.image(&path)?)
} else {
None
},
});
}
}
let mut cpu_meshes = Vec::new();
for object in obj.objects.iter() {
for mesh in object.geometry.iter() {
let mut positions = Vec::new();
let mut normals = Vec::new();
let mut uvs = Vec::new();
let mut indices = Vec::new();
let mut map: HashMap<usize, usize> = HashMap::new();
let mut process = |i: wavefront_obj::obj::VTNIndex| {
let mut index = map.get(&i.0).map(|v| *v);
let uvw = i.1.map(|tex_index| object.tex_vertices[tex_index]);
let normal = i.2.map(|normal_index| object.normals[normal_index]);
if let Some(ind) = index {
if let Some(tex) = uvw {
if ((uvs[ind * 2] - tex.u as f32) as f32).abs() > std::f32::EPSILON
|| ((uvs[ind * 2 + 1] - tex.v as f32) as f32).abs()
> std::f32::EPSILON
{
index = None;
}
}
if let Some(n) = normal {
if ((normals[ind * 3] - n.x as f32) as f32).abs() > std::f32::EPSILON
|| ((normals[ind * 3 + 1] - n.y as f32) as f32).abs()
> std::f32::EPSILON
|| ((normals[ind * 3 + 2] - n.z as f32) as f32).abs()
> std::f32::EPSILON
{
index = None;
}
}
}
if index.is_none() {
index = Some(positions.len() / 3);
map.insert(i.0, index.unwrap());
let position = object.vertices[i.0];
positions.push(position.x as f32);
positions.push(position.y as f32);
positions.push(position.z as f32);
if let Some(tex) = uvw {
uvs.push(tex.u as f32);
uvs.push(tex.v as f32);
}
if let Some(n) = normal {
normals.push(n.x as f32);
normals.push(n.y as f32);
normals.push(n.z as f32);
}
}
indices.push(index.unwrap() as u32);
};
for shape in mesh.shapes.iter() {
match shape.primitive {
wavefront_obj::obj::Primitive::Triangle(i0, i1, i2) => {
process(i0);
process(i1);
process(i2);
}
_ => {}
}
}
cpu_meshes.push(CPUMesh {
name: object.name.to_string(),
material_name: mesh.material_name.clone(),
positions,
indices: Some(indices),
normals: Some(normals),
uvs: Some(uvs),
colors: None,
});
}
}
Ok((cpu_meshes, cpu_materials))
}
}