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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use crate::dom::bindings::cell::DomRefCell;
use crate::dom::bindings::codegen::Bindings::GPUBufferBinding::GPUSize64;
use crate::dom::bindings::codegen::Bindings::GPUCommandEncoderBinding::{
GPUCommandBufferDescriptor, GPUCommandEncoderMethods, GPUComputePassDescriptor,
};
use crate::dom::bindings::reflector::DomObject;
use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::str::DOMString;
use crate::dom::globalscope::GlobalScope;
use crate::dom::gpubuffer::GPUBuffer;
use crate::dom::gpucommandbuffer::GPUCommandBuffer;
use crate::dom::gpucomputepassencoder::GPUComputePassEncoder;
use dom_struct::dom_struct;
use ipc_channel::ipc;
use std::cell::Cell;
use std::collections::HashSet;
use webgpu::wgpu::resource::BufferUsage;
use webgpu::{WebGPU, WebGPUCommandEncoder, WebGPURequest};
const BUFFER_COPY_ALIGN_MASK: u64 = 3;
// https://gpuweb.github.io/gpuweb/#enumdef-encoder-state
#[derive(MallocSizeOf, PartialEq)]
#[allow(dead_code)]
pub enum GPUCommandEncoderState {
Open,
EncodingRenderPass,
EncodingComputePass,
Closed,
}
#[dom_struct]
pub struct GPUCommandEncoder {
reflector_: Reflector,
#[ignore_malloc_size_of = "defined in webgpu"]
channel: WebGPU,
label: DomRefCell<Option<DOMString>>,
encoder: WebGPUCommandEncoder,
buffers: DomRefCell<HashSet<DomRoot<GPUBuffer>>>,
state: DomRefCell<GPUCommandEncoderState>,
valid: Cell<bool>,
}
impl GPUCommandEncoder {
pub fn new_inherited(
channel: WebGPU,
encoder: WebGPUCommandEncoder,
valid: bool,
) -> GPUCommandEncoder {
GPUCommandEncoder {
channel,
reflector_: Reflector::new(),
label: DomRefCell::new(None),
encoder,
buffers: DomRefCell::new(HashSet::new()),
state: DomRefCell::new(GPUCommandEncoderState::Open),
valid: Cell::new(valid),
}
}
pub fn new(
global: &GlobalScope,
channel: WebGPU,
encoder: WebGPUCommandEncoder,
valid: bool,
) -> DomRoot<GPUCommandEncoder> {
reflect_dom_object(
Box::new(GPUCommandEncoder::new_inherited(channel, encoder, valid)),
global,
)
}
}
impl GPUCommandEncoder {
pub fn id(&self) -> WebGPUCommandEncoder {
self.encoder
}
pub fn set_state(&self, set: GPUCommandEncoderState, expect: GPUCommandEncoderState) {
if *self.state.borrow() == expect {
*self.state.borrow_mut() = set;
} else {
self.valid.set(false);
*self.state.borrow_mut() = GPUCommandEncoderState::Closed;
}
}
}
impl GPUCommandEncoderMethods for GPUCommandEncoder {
/// https://gpuweb.github.io/gpuweb/#dom-gpuobjectbase-label
fn GetLabel(&self) -> Option<DOMString> {
self.label.borrow().clone()
}
/// https://gpuweb.github.io/gpuweb/#dom-gpuobjectbase-label
fn SetLabel(&self, value: Option<DOMString>) {
*self.label.borrow_mut() = value;
}
/// https://gpuweb.github.io/gpuweb/#dom-gpucommandencoder-begincomputepass
fn BeginComputePass(
&self,
_descriptor: &GPUComputePassDescriptor,
) -> DomRoot<GPUComputePassEncoder> {
self.set_state(
GPUCommandEncoderState::EncodingComputePass,
GPUCommandEncoderState::Open,
);
GPUComputePassEncoder::new(&self.global(), self.channel.clone(), &self)
}
/// https://gpuweb.github.io/gpuweb/#dom-gpucommandencoder-copybuffertobuffer
fn CopyBufferToBuffer(
&self,
source: &GPUBuffer,
source_offset: GPUSize64,
destination: &GPUBuffer,
destination_offset: GPUSize64,
size: GPUSize64,
) {
let mut valid = match source_offset.checked_add(size) {
Some(_) => true,
None => false,
};
valid &= match destination_offset.checked_add(size) {
Some(_) => true,
None => false,
};
valid &= match BufferUsage::from_bits(source.usage()) {
Some(usage) => usage.contains(BufferUsage::COPY_SRC),
None => false,
};
valid &= match BufferUsage::from_bits(destination.usage()) {
Some(usage) => usage.contains(BufferUsage::COPY_DST),
None => false,
};
valid &= (*self.state.borrow() == GPUCommandEncoderState::Open) &&
source.valid() &&
destination.valid() &
!(size & BUFFER_COPY_ALIGN_MASK == 0) &
!(source_offset & BUFFER_COPY_ALIGN_MASK == 0) &
!(destination_offset & BUFFER_COPY_ALIGN_MASK == 0) &
(source.size() >= source_offset + size) &
(destination.size() >= destination_offset + size);
if source.id().0 == destination.id().0 {
//TODO: maybe forbid this case based on https://github.com/gpuweb/gpuweb/issues/783
valid &= source_offset > destination_offset + size ||
source_offset + size < destination_offset;
}
if !valid {
// TODO: Record an error in the current scope.
self.valid.set(false);
return;
}
self.buffers.borrow_mut().insert(DomRoot::from_ref(source));
self.buffers
.borrow_mut()
.insert(DomRoot::from_ref(destination));
self.channel
.0
.send(WebGPURequest::CopyBufferToBuffer {
command_encoder_id: self.encoder.0,
source_id: source.id().0,
source_offset,
destination_id: destination.id().0,
destination_offset,
size,
})
.expect("Failed to send CopyBufferToBuffer");
}
/// https://gpuweb.github.io/gpuweb/#dom-gpucommandencoder-finish
fn Finish(&self, _descriptor: &GPUCommandBufferDescriptor) -> DomRoot<GPUCommandBuffer> {
let (sender, receiver) = ipc::channel().unwrap();
self.channel
.0
.send(WebGPURequest::CommandEncoderFinish {
sender,
command_encoder_id: self.encoder.0,
// TODO(zakorgy): We should use `_descriptor` here after it's not empty
// and the underlying wgpu-core struct is serializable
})
.expect("Failed to send Finish");
*self.state.borrow_mut() = GPUCommandEncoderState::Closed;
let buffer = receiver.recv().unwrap();
GPUCommandBuffer::new(
&self.global(),
self.channel.clone(),
buffer,
self.buffers.borrow_mut().drain().collect(),
)
}
}
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