#![allow(clippy::bool_assert_comparison, clippy::useless_conversion)]
use glam::{Vec2, Vec3};
pub type Face = [u32; 3];
#[derive(Debug)]
struct Vertex {
position: Vec3,
normal: Vec3,
tex_coord: Vec2,
}
struct Mesh {
faces: Vec<Face>,
vertices: Vec<Vertex>,
}
fn vertex(mesh: &Mesh, face: usize, vert: usize) -> &Vertex {
let vs: &[u32; 3] = &mesh.faces[face];
&mesh.vertices[vs[vert] as usize]
}
impl bevy_mikktspace::Geometry for Mesh {
fn num_faces(&self) -> usize {
self.faces.len()
}
fn num_vertices_of_face(&self, _face: usize) -> usize {
3
}
fn position(&self, face: usize, vert: usize) -> [f32; 3] {
vertex(self, face, vert).position.into()
}
fn normal(&self, face: usize, vert: usize) -> [f32; 3] {
vertex(self, face, vert).normal.into()
}
fn tex_coord(&self, face: usize, vert: usize) -> [f32; 2] {
vertex(self, face, vert).tex_coord.into()
}
fn set_tangent_encoded(&mut self, tangent: [f32; 4], face: usize, vert: usize) {
println!(
"{face}-{vert}: v: {v:?}, vn: {vn:?}, vt: {vt:?}, vx: {vx:?}",
face = face,
vert = vert,
v = vertex(self, face, vert).position,
vn = vertex(self, face, vert).normal,
vt = vertex(self, face, vert).tex_coord,
vx = tangent,
);
}
}
fn make_cube() -> Mesh {
struct ControlPoint {
uv: [f32; 2],
dir: [f32; 3],
}
let mut faces = Vec::new();
let mut ctl_pts = Vec::new();
let mut vertices = Vec::new();
{
let base = ctl_pts.len() as u32;
faces.push([base, base + 1, base + 4]);
faces.push([base + 1, base + 2, base + 4]);
faces.push([base + 2, base + 3, base + 4]);
faces.push([base + 3, base, base + 4]);
ctl_pts.push(ControlPoint {
uv: [0.0, 0.0],
dir: [1.0, -1.0, 1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 1.0],
dir: [1.0, -1.0, -1.0],
});
ctl_pts.push(ControlPoint {
uv: [1.0, 1.0],
dir: [1.0, 1.0, -1.0],
});
ctl_pts.push(ControlPoint {
uv: [1.0, 0.0],
dir: [1.0, 1.0, 1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.5, 0.5],
dir: [1.0, 0.0, 0.0],
});
}
{
let base = ctl_pts.len() as u32;
faces.push([base, base + 1, base + 4]);
faces.push([base + 1, base + 2, base + 4]);
faces.push([base + 2, base + 3, base + 4]);
faces.push([base + 3, base, base + 4]);
ctl_pts.push(ControlPoint {
uv: [1.0, 0.0],
dir: [-1.0, 1.0, 1.0],
});
ctl_pts.push(ControlPoint {
uv: [1.0, 1.0],
dir: [-1.0, 1.0, -1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 1.0],
dir: [-1.0, -1.0, -1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 0.0],
dir: [-1.0, -1.0, 1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.5, 0.5],
dir: [-1.0, 0.0, 0.0],
});
}
{
let base = ctl_pts.len() as u32;
faces.push([base, base + 1, base + 4]);
faces.push([base + 1, base + 2, base + 4]);
faces.push([base + 2, base + 3, base + 4]);
faces.push([base + 3, base, base + 4]);
ctl_pts.push(ControlPoint {
uv: [0.0, 0.0],
dir: [1.0, 1.0, 1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 1.0],
dir: [1.0, 1.0, -1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 1.0],
dir: [-1.0, 1.0, -1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 0.0],
dir: [-1.0, 1.0, 1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 0.5],
dir: [0.0, 1.0, 0.0],
});
}
{
let base = ctl_pts.len() as u32;
faces.push([base, base + 1, base + 4]);
faces.push([base + 1, base + 2, base + 4]);
faces.push([base + 2, base + 3, base + 4]);
faces.push([base + 3, base, base + 4]);
ctl_pts.push(ControlPoint {
uv: [0.0, 0.0],
dir: [-1.0, -1.0, 1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 1.0],
dir: [-1.0, -1.0, -1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 1.0],
dir: [1.0, -1.0, -1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 0.0],
dir: [1.0, -1.0, 1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 0.5],
dir: [0.0, -1.0, 0.0],
});
}
{
let base = ctl_pts.len() as u32;
faces.push([base, base + 1, base + 4]);
faces.push([base + 1, base + 2, base + 4]);
faces.push([base + 2, base + 3, base + 4]);
faces.push([base + 3, base, base + 4]);
ctl_pts.push(ControlPoint {
uv: [0.0, 0.0],
dir: [-1.0, 1.0, 1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 1.0],
dir: [-1.0, -1.0, 1.0],
});
ctl_pts.push(ControlPoint {
uv: [1.0, 1.0],
dir: [1.0, -1.0, 1.0],
});
ctl_pts.push(ControlPoint {
uv: [1.0, 0.0],
dir: [1.0, 1.0, 1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.5, 0.5],
dir: [0.0, 0.0, 1.0],
});
}
{
let base = ctl_pts.len() as u32;
faces.push([base, base + 1, base + 4]);
faces.push([base + 1, base + 2, base + 4]);
faces.push([base + 2, base + 3, base + 4]);
faces.push([base + 3, base, base + 4]);
ctl_pts.push(ControlPoint {
uv: [1.0, 0.0],
dir: [1.0, 1.0, -1.0],
});
ctl_pts.push(ControlPoint {
uv: [1.0, 1.0],
dir: [1.0, -1.0, -1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 1.0],
dir: [-1.0, -1.0, -1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.0, 0.0],
dir: [-1.0, 1.0, -1.0],
});
ctl_pts.push(ControlPoint {
uv: [0.5, 0.5],
dir: [0.0, 0.0, -1.0],
});
}
for pt in ctl_pts {
let p: Vec3 = pt.dir.into();
let n: Vec3 = p.normalize();
let t: Vec2 = pt.uv.into();
vertices.push(Vertex {
position: (p / 2.0).into(),
normal: n.into(),
tex_coord: t.into(),
});
}
Mesh { faces, vertices }
}
fn main() {
let mut cube = make_cube();
let ret = bevy_mikktspace::generate_tangents(&mut cube);
assert_eq!(true, ret);
}