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use {
super::{native::ShaderNative, pad::Padded, vec::vec, ShaderRepr, Std140, Std430},
bytemuck::{Pod, Zeroable},
core::{
convert::TryFrom,
mem::{align_of, align_of_val, size_of, size_of_val},
},
std::cmp::Ordering,
};
#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(transparent)]
pub struct mat<T, const N: usize, const M: usize>(pub [vec<T, M>; N]);
impl<T: Default + Copy, const N: usize, const M: usize> Default for mat<T, N, M> {
fn default() -> Self {
mat([Default::default(); N])
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum WrongNumberOfElements {
NotEnoughElements,
TooManyElements,
}
impl<T: Pod, const N: usize, const M: usize> TryFrom<&[T]> for mat<T, N, M> {
type Error = WrongNumberOfElements;
fn try_from(v: &[T]) -> Result<Self, WrongNumberOfElements> {
debug_assert_eq!(align_of_val(v), align_of::<Self>());
let len = v.len();
match len.cmp(&(N * M)) {
Ordering::Less => {
debug_assert!(size_of_val(v) < size_of::<Self>());
Err(WrongNumberOfElements::NotEnoughElements)
}
Ordering::Greater => {
debug_assert!(size_of_val(v) > size_of::<Self>());
Err(WrongNumberOfElements::TooManyElements)
}
Ordering::Equal => {
debug_assert_eq!(size_of_val(v), size_of::<Self>());
Ok(bytemuck::cast_slice(v)[0])
}
}
}
}
unsafe impl<T: Zeroable, const N: usize, const M: usize> Zeroable for mat<T, N, M> {}
unsafe impl<T: Pod, const N: usize, const M: usize> Pod for mat<T, N, M> {}
pub type mat2x2<T = f32> = mat<T, 2, 2>;
pub type mat3x2<T = f32> = mat<T, 3, 2>;
pub type mat4x2<T = f32> = mat<T, 4, 2>;
pub type mat2x3<T = f32> = mat<T, 2, 3>;
pub type mat3x3<T = f32> = mat<T, 3, 3>;
pub type mat4x3<T = f32> = mat<T, 4, 3>;
pub type mat3x4<T = f32> = mat<T, 3, 4>;
pub type mat4x4<T = f32> = mat<T, 4, 4>;
pub type mat2x4<T = f32> = mat<T, 2, 4>;
pub type bmat2 = mat2<bool>;
pub type bmat3 = mat3<bool>;
pub type bmat4 = mat4<bool>;
pub type bmat2x2 = mat2x2<bool>;
pub type bmat3x2 = mat3x2<bool>;
pub type bmat4x2 = mat4x2<bool>;
pub type bmat2x3 = mat2x3<bool>;
pub type bmat3x3 = mat3x3<bool>;
pub type bmat4x3 = mat4x3<bool>;
pub type bmat2x4 = mat2x4<bool>;
pub type bmat3x4 = mat3x4<bool>;
pub type bmat4x4 = mat4x4<bool>;
pub type imat2 = mat2<i32>;
pub type imat3 = mat3<i32>;
pub type imat4 = mat4<i32>;
pub type imat2x2 = mat2x2<i32>;
pub type imat3x2 = mat3x2<i32>;
pub type imat4x2 = mat4x2<i32>;
pub type imat2x3 = mat2x3<i32>;
pub type imat3x3 = mat3x3<i32>;
pub type imat4x3 = mat4x3<i32>;
pub type imat2x4 = mat2x4<i32>;
pub type imat3x4 = mat3x4<i32>;
pub type imat4x4 = mat4x4<i32>;
pub type umat2 = mat2<u32>;
pub type umat3 = mat3<u32>;
pub type umat4 = mat4<u32>;
pub type umat2x2 = mat2x2<u32>;
pub type umat3x2 = mat3x2<u32>;
pub type umat4x2 = mat4x2<u32>;
pub type umat2x3 = mat2x3<u32>;
pub type umat3x3 = mat3x3<u32>;
pub type umat4x3 = mat4x3<u32>;
pub type umat2x4 = mat2x4<u32>;
pub type umat3x4 = mat3x4<u32>;
pub type umat4x4 = mat4x4<u32>;
pub type dmat2 = mat2<f64>;
pub type dmat3 = mat3<f64>;
pub type dmat4 = mat4<f64>;
pub type dmat2x2 = mat2x2<f64>;
pub type dmat3x2 = mat3x2<f64>;
pub type dmat4x2 = mat4x2<f64>;
pub type dmat2x3 = mat2x3<f64>;
pub type dmat3x3 = mat3x3<f64>;
pub type dmat4x3 = mat4x3<f64>;
pub type dmat2x4 = mat2x4<f64>;
pub type dmat3x4 = mat3x4<f64>;
pub type dmat4x4 = mat4x4<f64>;
pub type mat2<T = f32> = mat2x2<T>;
pub type mat3<T = f32> = mat3x3<T>;
pub type mat4<T = f32> = mat4x4<T>;
macro_rules! impl_mats {
($($n:tt ( $($m:tt)* )),+) => {$($(
impl<T> ShaderRepr<Std140> for mat<T, $n, $m>
where
vec<T, $m>: ShaderNative,
{
const ALIGN_MASK: usize = <vec<T, $m> as ShaderNative>::ALIGN_MASK | 15;
const ARRAY_PADDING: usize = 0;
type Type = [Padded<vec<T, $m>, <vec<T, $m> as ShaderNative>::ArrayPadding140>; $n];
type ArrayPadding = [u8; 0];
fn copy_to_repr(&self, repr: &mut Self::Type) {
ShaderRepr::<Std140>::copy_to_repr(&self.0, repr)
}
}
impl<T> ShaderRepr<Std430> for mat<T, $n, $m>
where
vec<T, $m>: ShaderNative,
{
const ALIGN_MASK: usize = <vec<T, $m> as ShaderNative>::ALIGN_MASK | 15;
const ARRAY_PADDING: usize = 0;
type Type = [Padded<vec<T, $m>, <vec<T, $m> as ShaderNative>::ArrayPadding430>; $n];
type ArrayPadding = [u8; 0];
fn copy_to_repr(&self, repr: &mut Self::Type) {
ShaderRepr::<Std430>::copy_to_repr(&self.0, repr)
}
}
impl<T: Pod> From<[[T; $m]; $n]> for mat<T, $n, $m> {
fn from(v: [[T; $m]; $n]) -> Self {
bytemuck::cast(v)
}
}
impl<T: Pod> From<[T; $m * $n]> for mat<T, $n, $m> {
fn from(v: [T; $m * $n]) -> Self {
bytemuck::cast(v)
}
}
)*)*};
}
impl_mats!(2 ( 2 3 4 ), 3 ( 2 3 4), 4 ( 2 3 4));