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use gfx::format::{ChannelType, Format, SurfaceType};
use gfx::pso::buffer::Element;
use gfx::traits::Pod;
pub type AttributeFormat = Element<Format>;
pub type Attributes<'a> = &'a [(&'a str, AttributeFormat)];
pub trait Attribute {
const NAME: &'static str;
const FORMAT: Format;
const SIZE: u32;
type Repr: Pod + Send + Sync;
}
#[derive(Clone, Debug)]
pub enum Position {}
impl Attribute for Position {
const NAME: &'static str = "position";
const FORMAT: Format = Format(SurfaceType::R32_G32_B32, ChannelType::Float);
const SIZE: u32 = 12;
type Repr = [f32; 3];
}
#[derive(Clone, Debug)]
pub enum Color {}
impl Attribute for Color {
const NAME: &'static str = "color";
const FORMAT: Format = Format(SurfaceType::R32_G32_B32_A32, ChannelType::Unorm);
const SIZE: u32 = 16;
type Repr = [f32; 4];
}
#[derive(Clone, Debug)]
pub enum TexCoord {}
impl Attribute for TexCoord {
const NAME: &'static str = "tex_coord";
const FORMAT: Format = Format(SurfaceType::R32_G32, ChannelType::Float);
const SIZE: u32 = 8;
type Repr = [f32; 2];
}
#[derive(Clone, Debug)]
pub enum Normal {}
impl Attribute for Normal {
const NAME: &'static str = "normal";
const FORMAT: Format = Format(SurfaceType::R32_G32_B32, ChannelType::Float);
const SIZE: u32 = 12;
type Repr = [f32; 3];
}
#[derive(Clone, Debug)]
pub enum Tangent {}
impl Attribute for Tangent {
const NAME: &'static str = "tangent";
const FORMAT: Format = Format(SurfaceType::R32_G32_B32, ChannelType::Float);
const SIZE: u32 = 12;
type Repr = [f32; 3];
}
pub trait VertexFormat: Pod + Sized + Send + Sync {
const ATTRIBUTES: Attributes<'static>;
#[inline]
fn size() -> usize {
use std::mem;
mem::size_of::<Self>()
}
#[inline]
fn attribute<F>() -> AttributeFormat
where
F: Attribute,
Self: With<F>,
{
<Self as With<F>>::FORMAT
}
}
pub trait With<F: Attribute>: VertexFormat {
const FORMAT: AttributeFormat;
}
#[repr(C)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct Separate<T: Attribute>(T::Repr);
unsafe impl<T> Pod for Separate<T>
where
T: Attribute,
{
}
impl<T> Separate<T>
where
T: Attribute,
{
pub fn new(data: T::Repr) -> Self {
Separate(data)
}
}
impl<T> VertexFormat for Separate<T>
where
T: Attribute,
{
const ATTRIBUTES: Attributes<'static> = &[
(
T::NAME,
Element {
offset: 0,
format: T::FORMAT,
},
),
];
}
impl<T> With<T> for Separate<T>
where
T: Attribute,
{
const FORMAT: AttributeFormat = Element {
offset: 0,
format: T::FORMAT,
};
}
#[repr(C)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct PosColor {
pub position: [f32; 3],
pub color: [f32; 4],
}
unsafe impl Pod for PosColor {}
impl VertexFormat for PosColor {
const ATTRIBUTES: Attributes<'static> = &[
(Position::NAME, <Self as With<Position>>::FORMAT),
(Color::NAME, <Self as With<Color>>::FORMAT),
];
}
impl With<Position> for PosColor {
const FORMAT: AttributeFormat = Element {
offset: 0,
format: Position::FORMAT,
};
}
impl With<Color> for PosColor {
const FORMAT: AttributeFormat = Element {
offset: Position::SIZE,
format: Color::FORMAT,
};
}
#[repr(C)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct PosTex {
pub position: [f32; 3],
pub tex_coord: [f32; 2],
}
unsafe impl Pod for PosTex {}
impl VertexFormat for PosTex {
const ATTRIBUTES: Attributes<'static> = &[
(Position::NAME, <Self as With<Position>>::FORMAT),
(TexCoord::NAME, <Self as With<TexCoord>>::FORMAT),
];
}
impl With<Position> for PosTex {
const FORMAT: AttributeFormat = Element {
offset: 0,
format: Position::FORMAT,
};
}
impl With<TexCoord> for PosTex {
const FORMAT: AttributeFormat = Element {
offset: Position::SIZE,
format: TexCoord::FORMAT,
};
}
#[repr(C)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct PosNormTex {
pub position: [f32; 3],
pub normal: [f32; 3],
pub tex_coord: [f32; 2],
}
unsafe impl Pod for PosNormTex {}
impl VertexFormat for PosNormTex {
const ATTRIBUTES: Attributes<'static> = &[
(Position::NAME, <Self as With<Position>>::FORMAT),
(Normal::NAME, <Self as With<Normal>>::FORMAT),
(TexCoord::NAME, <Self as With<TexCoord>>::FORMAT),
];
}
impl With<Position> for PosNormTex {
const FORMAT: AttributeFormat = Element {
offset: 0,
format: Position::FORMAT,
};
}
impl With<Normal> for PosNormTex {
const FORMAT: AttributeFormat = Element {
offset: Position::SIZE,
format: Normal::FORMAT,
};
}
impl With<TexCoord> for PosNormTex {
const FORMAT: AttributeFormat = Element {
offset: Position::SIZE + Normal::SIZE,
format: TexCoord::FORMAT,
};
}
#[repr(C)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct PosNormTangTex {
pub position: [f32; 3],
pub normal: [f32; 3],
pub tangent: [f32; 3],
pub tex_coord: [f32; 2],
}
unsafe impl Pod for PosNormTangTex {}
impl VertexFormat for PosNormTangTex {
const ATTRIBUTES: Attributes<'static> = &[
(Position::NAME, <Self as With<Position>>::FORMAT),
(Normal::NAME, <Self as With<Normal>>::FORMAT),
(Tangent::NAME, <Self as With<Tangent>>::FORMAT),
(TexCoord::NAME, <Self as With<TexCoord>>::FORMAT),
];
}
impl With<Position> for PosNormTangTex {
const FORMAT: AttributeFormat = Element {
offset: 0,
format: Position::FORMAT,
};
}
impl With<Normal> for PosNormTangTex {
const FORMAT: AttributeFormat = Element {
offset: Position::SIZE,
format: Normal::FORMAT,
};
}
impl With<Tangent> for PosNormTangTex {
const FORMAT: AttributeFormat = Element {
offset: Position::SIZE + Normal::SIZE,
format: Tangent::FORMAT,
};
}
impl With<TexCoord> for PosNormTangTex {
const FORMAT: AttributeFormat = Element {
offset: Position::SIZE + Normal::SIZE + Tangent::SIZE,
format: TexCoord::FORMAT,
};
}
pub type VertexBufferCombination = (
Vec<Separate<Position>>,
Option<Vec<Separate<Color>>>,
Option<Vec<Separate<TexCoord>>>,
Option<Vec<Separate<Normal>>>,
Option<Vec<Separate<Tangent>>>,
);
pub trait Query<T>: VertexFormat {
const QUERIED_ATTRIBUTES: Attributes<'static>;
}
macro_rules! impl_query {
($($a:ident),*) => {
impl<VF $(,$a)*> Query<($($a,)*)> for VF
where VF: VertexFormat,
$(
$a: Attribute,
VF: With<$a>,
)*
{
const QUERIED_ATTRIBUTES: Attributes<'static> = &[
$(
($a::NAME, <VF as With<$a>>::FORMAT),
)*
];
}
impl_query!(@ $($a),*);
};
(@) => {};
(@ $head:ident $(,$tail:ident)*) => {
impl_query!($($tail),*);
};
}
impl_query!(
A,
B,
C,
D,
E,
F,
G,
H,
I,
J,
K,
L,
M,
N,
O,
P,
Q,
R,
S,
T,
U,
V,
W,
X,
Y,
Z
);