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//! Code for using multiple draw passes in place of just one
//! Note that this can be extended to an arbitrary amount of draw passes.
use super::{Beginning, DrawPass, End, IntoDrawPass, Middle, Singular};
use crate::{context::RenderingContext, queue_negotiator::QueueNegotiator, types::*};
use stockton_types::Session;
use anyhow::Result;
/// One draw pass, then another.
pub struct ConsDrawPass<A, B> {
pub a: A,
pub b: B,
}
macro_rules! cons_shared_impl {
() => {
fn queue_draw(
&mut self,
session: &Session,
img_view: &ImageViewT,
cmd_buffer: &mut CommandBufferT,
) -> Result<()> {
self.a.queue_draw(session, img_view, cmd_buffer)?;
self.b.queue_draw(session, img_view, cmd_buffer)?;
Ok(())
}
fn deactivate(self, context: &mut RenderingContext) -> Result<()> {
self.a.deactivate(context)?;
self.b.deactivate(context)
}
fn handle_surface_change(
&mut self,
session: &Session,
context: &mut RenderingContext,
) -> Result<()> {
self.a.handle_surface_change(session, context)?;
self.b.handle_surface_change(session, context)
}
};
}
impl<A, B> DrawPass<Singular> for ConsDrawPass<A, B>
where
A: DrawPass<Beginning>,
B: DrawPass<End>,
{
cons_shared_impl! {}
}
impl<A, B> DrawPass<End> for ConsDrawPass<A, B>
where
A: DrawPass<Middle>,
B: DrawPass<End>,
{
cons_shared_impl! {}
}
macro_rules! into_shared_impl {
() => {
fn init(
self,
session: &mut Session,
context: &mut RenderingContext,
) -> Result<ConsDrawPass<A, B>> {
Ok(ConsDrawPass {
a: self.0.init(session, context)?,
b: self.1.init(session, context)?,
})
}
fn find_aux_queues<'a>(
adapter: &'a Adapter,
queue_negotiator: &mut QueueNegotiator,
) -> Result<Vec<(&'a QueueFamilyT, Vec<f32>)>> {
let mut v = IA::find_aux_queues(adapter, queue_negotiator)?;
v.extend(IB::find_aux_queues(adapter, queue_negotiator)?);
Ok(v)
}
};
}
impl<A, B, IA, IB> IntoDrawPass<ConsDrawPass<A, B>, Singular> for (IA, IB)
where
A: DrawPass<Beginning>,
B: DrawPass<End>,
IA: IntoDrawPass<A, Beginning>,
IB: IntoDrawPass<B, End>,
{
into_shared_impl! {}
}
impl<A, B, IA, IB> IntoDrawPass<ConsDrawPass<A, B>, End> for (IA, IB)
where
A: DrawPass<Middle>,
B: DrawPass<End>,
IA: IntoDrawPass<A, Middle>,
IB: IntoDrawPass<B, End>,
{
into_shared_impl! {}
}
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