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|
use std::borrow::Cow;
use crate::proto::{Mesh, Texture, texture::Format};
use anyhow::Result;
use glam::{Vec2, Vec3A, vec2, vec3a};
use weareshared::{
packets::Resource,
resources::{Image, MeshPart},
store::ResourceStore,
};
pub fn convert_mesh(
m: Mesh,
store: &ResourceStore,
normal_table: &[Vec3A],
) -> Result<Resource<MeshPart>> {
let index = decode_indices(&m.indices);
let positions = decode_positions(m.vertices());
let texcoords = decode_texcoords(m.texture_coordinates(), &m.uv_offset_and_scale);
let normals = decode_normals(m.normals(), normal_table);
let texture = decode_texture(&m.texture[0]);
Ok(store.set(&MeshPart {
index: Some(store.set(&index)?),
va_position: Some(store.set(&positions)?),
va_texcoord: texcoords.map(|x| store.set(&x)).transpose()?,
va_normal: Some(store.set(&normals)?),
g_double_sided: Some(()),
tex_albedo: Some(store.set(&texture)?),
..Default::default()
})?)
}
fn decode_texture(texture: &Texture) -> Image<'static> {
match texture.format() {
Format::Jpg => Image(Cow::Owned(texture.data[0].clone())),
Format::Dxt1 => todo!(),
Format::Etc1 => todo!(),
Format::Pvrtc2 => todo!(),
Format::Pvrtc4 => todo!(),
Format::CrnDxt1 => todo!(),
}
}
fn decode_texcoords(uv: &[u8], offset_and_scale: &[f32]) -> Option<Vec<Vec2>> {
if uv.is_empty() {
return None;
}
let count = (uv.len() - 4) / 4;
let u_mod = u16::from_le_bytes([uv[0], uv[1]]);
let v_mod = u16::from_le_bytes([uv[2], uv[3]]);
let uv = &uv[4..];
let (offset, scale) = if offset_and_scale.len() == 4 {
(
vec2(offset_and_scale[0], offset_and_scale[1]),
vec2(offset_and_scale[2], offset_and_scale[3]),
)
} else {
(Vec2::ZERO, vec2(1. / u_mod as f32, -1. / v_mod as f32))
};
let (mut u, mut v) = (0u16, 0u16);
let mut texcoords = Vec::new();
for i in 0..count {
u = u.wrapping_add((uv[count * 0 + i] as u16) + ((uv[count * 2 + i] as u16) << 8));
v = v.wrapping_add((uv[count * 1 + i] as u16) + ((uv[count * 3 + i] as u16) << 8));
u %= u_mod;
v %= v_mod;
let c = vec2(u as f32, v as f32);
texcoords.push(scale * (offset + c))
}
Some(texcoords)
}
fn decode_positions(vert: &[u8]) -> Vec<Vec3A> {
let mut positions = Vec::new();
let vertex_count = vert.len() / 3;
let (mut x, mut y, mut z) = (0u8, 0u8, 0u8);
for i in 0..vertex_count {
x = x.wrapping_add(vert[vertex_count * 0 + i]);
y = y.wrapping_add(vert[vertex_count * 1 + i]);
z = z.wrapping_add(vert[vertex_count * 2 + i]);
positions.push(vec3a(x as f32, y as f32, z as f32));
}
positions
}
fn decode_indices(ind: &[i32]) -> Vec<[u32; 3]> {
let mut index_strip = Vec::new();
let strip_len = ind[0];
let mut zeros = 0;
for i in 0..strip_len {
let val = ind[i as usize + 1];
index_strip.push((zeros - val) as u32);
if val == 0 {
zeros += 1;
}
}
let mut index = Vec::new();
for i in 0..index_strip.len() - 2 {
if i & 1 == 0 {
index.push([index_strip[i + 0], index_strip[i + 1], index_strip[i + 2]]);
} else {
index.push([index_strip[i + 0], index_strip[i + 2], index_strip[i + 1]]);
}
}
index
}
pub fn decode_normals(data: &[u8], normal_table: &[Vec3A]) -> Vec<Vec3A> {
let count = data.len() / 2;
let mut normals = Vec::new();
for i in 0..count {
let ind = data[i] as usize + ((data[i + count] as usize) << 8);
normals.push(normal_table[ind]);
}
normals
}
pub fn decode_normal_table(data: &[u8]) -> Vec<Vec3A> {
// Pretty much taken straight from client/rocktree_decoder.h:111, no idea what f1 does.
let f1 = |v: i32, l: i32| {
if 4 >= l {
(v << l) + (v & (1 << l) - 1)
} else if 6 >= l {
let r = 8 - l;
(v << l) + (v << l >> r) + (v << l >> r >> r) + (v << l >> r >> r >> r)
} else {
-(v & 1)
}
};
let count = u16::from_le_bytes([data[0], data[1]]);
let s = data[2] as i32;
let data = &data[3..];
let mut output = Vec::new();
for i in 0..count {
let mut a = f1(data[(count * 0 + i) as usize] as i32, s) as f32 / 255.;
let f = f1(data[(count * 1 + i) as usize] as i32, s) as f32 / 255.;
let mut b = a;
let mut c = f;
let mut g = c + b;
let mut h = b - c;
let mut sign = 1.;
if !(0.5 <= g && 1.5 >= g && -0.5 <= h && 0.5 >= h) {
sign = -1.;
if 0.5 >= g {
b = 0.5 - f;
c = 0.5 - a;
} else {
if 1.5 <= g {
b = 1.5 - f;
c = 1.5 - a;
} else {
if -0.5 >= h {
b = f - 0.5;
c = a + 0.5;
} else {
b = f + 0.5;
c = a - 0.5;
}
}
}
g = b + c;
h = b - c;
}
let fmin = |a: f32, b: f32| a.min(b);
a = fmin(
fmin(2. * g - 1., 3. - 2. * g),
fmin(2. * h + 1., 1. - 2. * h),
) * sign;
b = 2. * b - 1.;
c = 2. * c - 1.;
output.push(vec3a(a, b, c).normalize_or_zero());
}
output
}
|
