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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 std::sync::{Arc, RwLock};
use super::DrawPass;
use crate::types::*;
use stockton_types::Session;
use anyhow::Result;
/// One draw pass, then another.
pub struct ConsDrawPass<A: DrawPass, B: DrawPass> {
a: A,
b: B,
}
impl<A: DrawPass, B: DrawPass> DrawPass for ConsDrawPass<A, B> {
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, device: &mut Arc<RwLock<DeviceT>>) -> Result<()> {
self.a.deactivate(device)?;
self.b.deactivate(device)
}
}
/// A draw pass that does nothing. Can be used at the end of sequences if there's an odd number of draw passes.
pub struct NilDrawPass;
impl DrawPass for NilDrawPass {
fn queue_draw(
&mut self,
_input: &Session,
_img_view: &ImageViewT,
_cmd_buffer: &mut CommandBufferT,
) -> Result<()> {
Ok(())
}
fn deactivate(self, _device: &mut Arc<RwLock<DeviceT>>) -> Result<()> {
Ok(())
}
}
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