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Make fences mutable

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Change the interface for fences to accept mutable references. This will
actualy help the Metal backend more than dx12 (avoiding interior
mutability) but more accurately captures intent and matches gfx-hal.
This commit is contained in:
Raph Levien 2021-05-27 15:37:05 -07:00
parent 37de07f670
commit b6292c644f
7 changed files with 49 additions and 31 deletions
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6
piet-gpu-hal/examples/dx12_toy.rs
View file

@ -73,7 +73,7 @@ fn toy() -> Result<(), Error> {
let pipeline = device.create_simple_compute_pipeline(SHADER_CODE, 1, 1)?;
let ds = device.create_descriptor_set(&pipeline, &[&dev_buf], &[&img])?;
let mut cmd_buf = device.create_cmd_buf()?;
let fence = device.create_fence(false)?;
let mut fence = device.create_fence(false)?;
cmd_buf.begin();
cmd_buf.copy_buffer(&buf, &dev_buf);
cmd_buf.memory_barrier();
@ -86,8 +86,8 @@ fn toy() -> Result<(), Error> {
cmd_buf.finish_timestamps(&query_pool);
cmd_buf.host_barrier();
cmd_buf.finish();
device.run_cmd_bufs(&[&cmd_buf], &[], &[], Some(&fence))?;
device.wait_and_reset(&[&fence])?;
device.run_cmd_bufs(&[&cmd_buf], &[], &[], Some(&mut fence))?;
device.wait_and_reset(&[&mut fence])?;
let mut readback: Vec<u32> = vec![0u32; 256];
device.read_buffer(&buf, readback.as_mut_ptr() as *mut u8, 0, 1024)?;
println!("{:?}", readback);

4
piet-gpu-hal/src/dx12.rs
View file

@ -348,7 +348,7 @@ impl crate::Device for Dx12Device {
cmd_bufs: &[&Self::CmdBuf],
_wait_semaphores: &[&Self::Semaphore],
_signal_semaphores: &[&Self::Semaphore],
fence: Option<&Self::Fence>,
fence: Option<&mut Self::Fence>,
) -> Result<(), Error> {
// TODO: handle semaphores
let lists = cmd_bufs
@ -405,7 +405,7 @@ impl crate::Device for Dx12Device {
Ok(Fence { fence, event, val })
}
unsafe fn wait_and_reset(&self, fences: &[&Self::Fence]) -> Result<(), Error> {
unsafe fn wait_and_reset(&self, fences: &[&mut Self::Fence]) -> Result<(), Error> {
for fence in fences {
// TODO: probably handle errors here.
let _status = fence.event.wait(winapi::um::winbase::INFINITE);

12
piet-gpu-hal/src/hub.rs
View file

@ -124,9 +124,9 @@ impl Session {
let mut i = 0;
while i < pending.len() {
if let Ok(true) = self.0.device.get_fence_status(&pending[i].fence) {
let item = pending.swap_remove(i);
let mut item = pending.swap_remove(i);
// TODO: wait is superfluous, can just reset
let _ = self.0.device.wait_and_reset(&[&item.fence]);
let _ = self.0.device.wait_and_reset(vec![&mut item.fence]);
let mut pool = self.0.cmd_buf_pool.lock().unwrap();
pool.push((item.cmd_buf, item.fence));
std::mem::drop(item.resources);
@ -143,7 +143,7 @@ impl Session {
pub unsafe fn run_cmd_buf(
&self,
cmd_buf: CmdBuf,
mut cmd_buf: CmdBuf,
wait_semaphores: &[&Semaphore],
signal_semaphores: &[&Semaphore],
) -> Result<SubmittedCmdBuf, Error> {
@ -162,7 +162,7 @@ impl Session {
&cmd_bufs,
wait_semaphores,
signal_semaphores,
Some(&cmd_buf.fence),
Some(&mut cmd_buf.fence),
)?;
Ok(SubmittedCmdBuf(
Some(SubmittedCmdBufInner {
@ -313,10 +313,10 @@ impl CmdBuf {
impl SubmittedCmdBuf {
pub fn wait(mut self) -> Result<(), Error> {
let item = self.0.take().unwrap();
let mut item = self.0.take().unwrap();
if let Some(session) = Weak::upgrade(&self.1) {
unsafe {
session.device.wait_and_reset(&[&item.fence])?;
session.device.wait_and_reset(vec![&mut item.fence])?;
}
session
.cmd_buf_pool

4
piet-gpu-hal/src/lib.rs
View file

@ -194,7 +194,7 @@ pub trait Device: Sized {
cmd_buf: &[&Self::CmdBuf],
wait_semaphores: &[&Self::Semaphore],
signal_semaphores: &[&Self::Semaphore],
fence: Option<&Self::Fence>,
fence: Option<&mut Self::Fence>,
) -> Result<(), Error>;
/// Copy data from the buffer to memory.
@ -231,7 +231,7 @@ pub trait Device: Sized {
unsafe fn create_semaphore(&self) -> Result<Self::Semaphore, Error>;
unsafe fn create_fence(&self, signaled: bool) -> Result<Self::Fence, Error>;
unsafe fn wait_and_reset(&self, fences: &[&Self::Fence]) -> Result<(), Error>;
unsafe fn wait_and_reset(&self, fences: &[&mut Self::Fence]) -> Result<(), Error>;
unsafe fn get_fence_status(&self, fence: &Self::Fence) -> Result<bool, Error>;
unsafe fn create_sampler(&self, params: SamplerParams) -> Result<Self::Sampler, Error>;

20
piet-gpu-hal/src/macros.rs
View file

@ -51,6 +51,16 @@ macro_rules! mux_enum {
}
}
}
$crate::mux_cfg! {
#[cfg(vk)]
#[allow(unused)]
fn vk_mut(&mut self) -> &mut $vk {
match self {
$name::Vk(x) => x,
_ => panic!("downcast error")
}
}
}
$crate::mux_cfg! {
#[cfg(dx12)]
@ -62,6 +72,16 @@ macro_rules! mux_enum {
}
}
}
$crate::mux_cfg! {
#[cfg(dx12)]
#[allow(unused)]
fn dx12_mut(&mut self) -> &mut $dx12 {
match self {
$name::Dx12(x) => x,
_ => panic!("downcast error")
}
}
}
}
};
}

27
piet-gpu-hal/src/mux.rs
View file

@ -197,23 +197,22 @@ impl Device {
}
}
pub unsafe fn wait_and_reset(&self, fences: &[&Fence]) -> Result<(), Error> {
// Consider changing Vec to iterator (as is done in gfx-hal)
pub unsafe fn wait_and_reset(&self, fences: Vec<&mut Fence>) -> Result<(), Error> {
mux_match! { self;
Device::Vk(d) => {
let fences = fences
.iter()
.copied()
.map(Fence::vk)
let mut fences = fences
.into_iter()
.map(|f| f.vk_mut())
.collect::<SmallVec<[_; 4]>>();
d.wait_and_reset(&*fences)
d.wait_and_reset(&mut fences)
}
Device::Dx12(d) => {
let fences = fences
.iter()
.copied()
.map(Fence::dx12)
let mut fences = fences
.into_iter()
.map(|f| f.dx12_mut())
.collect::<SmallVec<[_; 4]>>();
d.wait_and_reset(&*fences)
d.wait_and_reset(&mut fences)
}
}
}
@ -272,7 +271,7 @@ impl Device {
cmd_bufs: &[&CmdBuf],
wait_semaphores: &[&Semaphore],
signal_semaphores: &[&Semaphore],
fence: Option<&Fence>,
fence: Option<&mut Fence>,
) -> Result<(), Error> {
mux_match! { self;
Device::Vk(d) => d.run_cmd_bufs(
@ -290,7 +289,7 @@ impl Device {
.copied()
.map(Semaphore::vk)
.collect::<SmallVec<[_; 4]>>(),
fence.map(Fence::vk),
fence.map(Fence::vk_mut),
),
Device::Dx12(d) => d.run_cmd_bufs(
&cmd_bufs
@ -307,7 +306,7 @@ impl Device {
.copied()
.map(Semaphore::dx12)
.collect::<SmallVec<[_; 4]>>(),
fence.map(Fence::dx12),
fence.map(Fence::dx12_mut),
),
}
}

7
piet-gpu-hal/src/vulkan.rs
View file

@ -619,12 +619,11 @@ impl crate::Device for VkDevice {
Ok(device.create_semaphore(&vk::SemaphoreCreateInfo::default(), None)?)
}
unsafe fn wait_and_reset(&self, fences: &[&Self::Fence]) -> Result<(), Error> {
unsafe fn wait_and_reset(&self, fences: &[&mut Self::Fence]) -> Result<(), Error> {
let device = &self.device.device;
let fences = fences
.iter()
.copied()
.copied()
.map(|f| **f)
.collect::<SmallVec<[_; 4]>>();
device.wait_for_fences(&fences, true, !0)?;
device.reset_fences(&fences)?;
@ -718,7 +717,7 @@ impl crate::Device for VkDevice {
cmd_bufs: &[&CmdBuf],
wait_semaphores: &[&Self::Semaphore],
signal_semaphores: &[&Self::Semaphore],
fence: Option<&Self::Fence>,
fence: Option<&mut Self::Fence>,
) -> Result<(), Error> {
let device = &self.device.device;