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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::{DrawPass, DrawPassInput};
use crate::{draw::queue_negotiator::QueueNegotiator, types::*};
use anyhow::Result;
/// One draw pass, then another.
struct ConsDrawPass<A: DrawPass, B: DrawPass> {
a: A,
b: B,
}
impl<A: DrawPass, B: DrawPass> DrawPass for ConsDrawPass<A, B> {
type Input = ConsDrawPassInput<A::Input, B::Input>;
fn queue_draw(&self, input: &Self::Input, cmd_buffer: &mut CommandBufferT) -> Result<()> {
self.a.queue_draw(&input.a, cmd_buffer)?;
self.b.queue_draw(&input.b, cmd_buffer)?;
Ok(())
}
fn find_aux_queues<'a>(
adapter: &'a Adapter,
queue_negotiator: &mut QueueNegotiator,
) -> Result<Vec<(&'a QueueFamilyT, Vec<f32>)>> {
let mut vec = Vec::new();
vec.extend(A::find_aux_queues(adapter, queue_negotiator)?);
vec.extend(B::find_aux_queues(adapter, queue_negotiator)?);
Ok(vec)
}
}
/// Input for a ConsDrawPass.
struct ConsDrawPassInput<A, B> {
pub a: A,
pub b: B,
}
impl<A: DrawPassInput, B: DrawPassInput> DrawPassInput for ConsDrawPassInput<A, B> {}
/// A draw pass that does nothing. Can be used at the end of sequences if there's an odd number of draw passes.
struct NilDrawPass;
impl DrawPass for NilDrawPass {
type Input = NilDrawPassInput;
fn queue_draw(&self, _input: &Self::Input, _cmd_buffer: &mut CommandBufferT) -> Result<()> {
Ok(())
}
fn find_aux_queues<'a>(
_adapter: &'a Adapter,
_queue_negotiator: &mut QueueNegotiator,
) -> Result<Vec<(&'a QueueFamilyT, Vec<f32>)>> {
Ok(vec![])
}
}
/// Input for a NilDrawPass.
struct NilDrawPassInput;
impl DrawPassInput for NilDrawPassInput {}
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