1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
/* 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 dom_struct::dom_struct;
use webgpu::wgpu::command::{compute_ffi as wgpu_comp, ComputePass};
use webgpu::{WebGPU, WebGPURequest};

use super::bindings::error::Fallible;
use crate::dom::bindings::cell::DomRefCell;
use crate::dom::bindings::codegen::Bindings::WebGPUBinding::GPUComputePassEncoderMethods;
use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
use crate::dom::bindings::root::{Dom, DomRoot};
use crate::dom::bindings::str::USVString;
use crate::dom::globalscope::GlobalScope;
use crate::dom::gpubindgroup::GPUBindGroup;
use crate::dom::gpubuffer::GPUBuffer;
use crate::dom::gpucommandencoder::{GPUCommandEncoder, GPUCommandEncoderState};
use crate::dom::gpucomputepipeline::GPUComputePipeline;

#[dom_struct]
pub struct GPUComputePassEncoder {
    reflector_: Reflector,
    #[ignore_malloc_size_of = "defined in webgpu"]
    #[no_trace]
    channel: WebGPU,
    label: DomRefCell<USVString>,
    #[ignore_malloc_size_of = "defined in wgpu-core"]
    #[no_trace]
    compute_pass: DomRefCell<Option<ComputePass>>,
    command_encoder: Dom<GPUCommandEncoder>,
}

impl GPUComputePassEncoder {
    fn new_inherited(
        channel: WebGPU,
        parent: &GPUCommandEncoder,
        compute_pass: Option<ComputePass>,
        label: USVString,
    ) -> Self {
        Self {
            channel,
            reflector_: Reflector::new(),
            label: DomRefCell::new(label),
            compute_pass: DomRefCell::new(compute_pass),
            command_encoder: Dom::from_ref(parent),
        }
    }

    pub fn new(
        global: &GlobalScope,
        channel: WebGPU,
        parent: &GPUCommandEncoder,
        compute_pass: Option<ComputePass>,
        label: USVString,
    ) -> DomRoot<Self> {
        reflect_dom_object(
            Box::new(GPUComputePassEncoder::new_inherited(
                channel,
                parent,
                compute_pass,
                label,
            )),
            global,
        )
    }
}

impl GPUComputePassEncoderMethods for GPUComputePassEncoder {
    /// https://gpuweb.github.io/gpuweb/#dom-gpuobjectbase-label
    fn Label(&self) -> USVString {
        self.label.borrow().clone()
    }

    /// https://gpuweb.github.io/gpuweb/#dom-gpuobjectbase-label
    fn SetLabel(&self, value: USVString) {
        *self.label.borrow_mut() = value;
    }

    /// https://gpuweb.github.io/gpuweb/#dom-gpucomputepassencoder-dispatchworkgroups
    fn DispatchWorkgroups(&self, x: u32, y: u32, z: u32) {
        if let Some(compute_pass) = self.compute_pass.borrow_mut().as_mut() {
            wgpu_comp::wgpu_compute_pass_dispatch_workgroups(compute_pass, x, y, z);
        }
    }

    /// https://gpuweb.github.io/gpuweb/#dom-gpucomputepassencoder-dispatchworkgroupsindirect
    fn DispatchWorkgroupsIndirect(&self, indirect_buffer: &GPUBuffer, indirect_offset: u64) {
        if let Some(compute_pass) = self.compute_pass.borrow_mut().as_mut() {
            wgpu_comp::wgpu_compute_pass_dispatch_workgroups_indirect(
                compute_pass,
                indirect_buffer.id().0,
                indirect_offset,
            );
        }
    }

    /// https://gpuweb.github.io/gpuweb/#dom-gpurenderpassencoder-endpass
    fn End(&self) -> Fallible<()> {
        let compute_pass = self.compute_pass.borrow_mut().take();
        self.channel
            .0
            .send((
                None,
                WebGPURequest::RunComputePass {
                    command_encoder_id: self.command_encoder.id().0,
                    compute_pass,
                },
            ))
            .expect("Failed to send RunComputePass"); //TODO: handle error

        self.command_encoder.set_state(
            GPUCommandEncoderState::Open,
            GPUCommandEncoderState::EncodingComputePass,
        );
        Ok(())
    }

    /// https://gpuweb.github.io/gpuweb/#dom-gpuprogrammablepassencoder-setbindgroup
    #[allow(unsafe_code)]
    fn SetBindGroup(&self, index: u32, bind_group: &GPUBindGroup, dynamic_offsets: Vec<u32>) {
        if let Some(compute_pass) = self.compute_pass.borrow_mut().as_mut() {
            unsafe {
                wgpu_comp::wgpu_compute_pass_set_bind_group(
                    compute_pass,
                    index,
                    bind_group.id().0,
                    dynamic_offsets.as_ptr(),
                    dynamic_offsets.len(),
                )
            };
        }
    }

    /// https://gpuweb.github.io/gpuweb/#dom-gpucomputepassencoder-setpipeline
    fn SetPipeline(&self, pipeline: &GPUComputePipeline) {
        if let Some(compute_pass) = self.compute_pass.borrow_mut().as_mut() {
            wgpu_comp::wgpu_compute_pass_set_pipeline(compute_pass, pipeline.id().0);
        }
    }
}