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use std::marker::PhantomData;
use std::mem;
use std::option::IntoIter as OptionIntoIter;
use std::sync::Arc;
use std::vec::IntoIter as VecIntoIter;
use buffer::BufferAccess;
use buffer::TypedBufferAccess;
use pipeline::shader::ShaderInterfaceDef;
use pipeline::vertex::AttributeInfo;
use pipeline::vertex::IncompatibleVertexDefinitionError;
use pipeline::vertex::InputRate;
use pipeline::vertex::Vertex;
use pipeline::vertex::VertexDefinition;
use pipeline::vertex::VertexSource;
pub struct SingleInstanceBufferDefinition<T>(pub PhantomData<T>);
impl<T> SingleInstanceBufferDefinition<T> {
#[inline]
pub fn new() -> SingleInstanceBufferDefinition<T> {
SingleInstanceBufferDefinition(PhantomData)
}
}
unsafe impl<T, I> VertexDefinition<I> for SingleInstanceBufferDefinition<T>
where
T: Vertex,
I: ShaderInterfaceDef,
{
type BuffersIter = OptionIntoIter<(u32, usize, InputRate)>;
type AttribsIter = VecIntoIter<(u32, u32, AttributeInfo)>;
fn definition(
&self,
interface: &I,
) -> Result<(Self::BuffersIter, Self::AttribsIter), IncompatibleVertexDefinitionError> {
let attrib = {
let mut attribs = Vec::with_capacity(interface.elements().len());
for e in interface.elements() {
let name = e.name.as_ref().unwrap();
let infos = match <T as Vertex>::member(name) {
Some(m) => m,
None => {
return Err(IncompatibleVertexDefinitionError::MissingAttribute {
attribute: name.clone().into_owned(),
})
}
};
if !infos.ty.matches(
infos.array_size,
e.format,
e.location.end - e.location.start,
) {
return Err(IncompatibleVertexDefinitionError::FormatMismatch {
attribute: name.clone().into_owned(),
shader: (e.format, (e.location.end - e.location.start) as usize),
definition: (infos.ty, infos.array_size),
});
}
let mut offset = infos.offset;
for loc in e.location.clone() {
attribs.push((
loc,
0,
AttributeInfo {
offset: offset,
format: e.format,
},
));
offset += e.format.size().unwrap();
}
}
attribs
}.into_iter();
let buffers = Some((0, mem::size_of::<T>(), InputRate::Instance)).into_iter();
Ok((buffers, attrib))
}
}
unsafe impl<V> VertexSource<Vec<Arc<dyn BufferAccess + Send + Sync>>>
for SingleInstanceBufferDefinition<V>
where
V: Vertex,
{
#[inline]
fn decode(
&self,
mut source: Vec<Arc<dyn BufferAccess + Send + Sync>>,
) -> (Vec<Box<dyn BufferAccess + Send + Sync>>, usize, usize) {
assert_eq!(source.len(), 1);
let len = source[0].size() / mem::size_of::<V>();
(vec![Box::new(source.remove(0))], 1, len)
}
}
unsafe impl<'a, B, V> VertexSource<B> for SingleInstanceBufferDefinition<V>
where
B: TypedBufferAccess<Content = [V]> + Send + Sync + 'static,
V: Vertex,
{
#[inline]
fn decode(&self, source: B) -> (Vec<Box<dyn BufferAccess + Send + Sync>>, usize, usize) {
let len = source.len();
(vec![Box::new(source) as Box<_>], 1, len)
}
}