gled 2.28.5

gled is an application for creating animations and effects on artnet or dmx installations
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//! Clear output buffer.
use crate::{OUTPUT_BUFFER, pipeline::constants::OUTPUT_BUFFER_SIZE, wgpu_render_state};
use std::{num::NonZeroU64, sync::OnceLock};
use wgpu::{
    BindGroup, BindGroupDescriptor, BindGroupEntry, BindGroupLayoutDescriptor,
    BindGroupLayoutEntry, BindingType, BufferBindingType, CommandEncoder, ComputePassDescriptor,
    ComputePipeline, ComputePipelineDescriptor, PipelineLayoutDescriptor, ShaderModuleDescriptor,
    ShaderSource, ShaderStages,
};

#[derive(Debug)]
pub struct OutputClear {
    pipeline: ComputePipeline,
    bind_group: BindGroup,
}

impl OutputClear {
    pub fn get() -> &'static Self {
        static OUTPUT_CLEAR: OnceLock<OutputClear> = OnceLock::new();
        OUTPUT_CLEAR.get_or_init(|| {
            let device = wgpu_render_state().device;

            let module = device.create_shader_module(ShaderModuleDescriptor {
                label: Some("OutputClear shader"),
                source: ShaderSource::Wgsl(include_str!("../shaders/output_clear.wgsl").into()),
            });

            let bind_group_layout = device.create_bind_group_layout(&BindGroupLayoutDescriptor {
                label: Some("OutputClear bind group layout"),
                entries: &[BindGroupLayoutEntry {
                    binding: 0,
                    visibility: ShaderStages::COMPUTE,
                    ty: BindingType::Buffer {
                        ty: BufferBindingType::Storage { read_only: false },
                        has_dynamic_offset: false,
                        min_binding_size: NonZeroU64::new(OUTPUT_BUFFER_SIZE),
                    },
                    count: None,
                }],
            });

            let pipeline_layout = device.create_pipeline_layout(&PipelineLayoutDescriptor {
                label: Some("OutputClear pipeline layout"),
                bind_group_layouts: &[Some(&bind_group_layout)],
                immediate_size: 0,
            });

            let pipeline = device.create_compute_pipeline(&ComputePipelineDescriptor {
                cache: None,
                label: Some("OutputClear pipeline"),
                layout: Some(&pipeline_layout),
                module: &module,
                entry_point: Some("main"),
                compilation_options: Default::default(),
            });

            let device = wgpu_render_state().device;
            let bind_group = device.create_bind_group(&BindGroupDescriptor {
                label: Some("OutputClear bind group"),
                layout: &bind_group_layout,
                entries: &[BindGroupEntry {
                    binding: 0,
                    resource: OUTPUT_BUFFER.as_entire_binding(),
                }],
            });

            Self {
                pipeline,
                bind_group,
            }
        })
    }

    #[cfg_attr(feature = "profiling", profiling::function)]
    pub fn run(&self, encoder: &mut CommandEncoder) {
        let mut compute_pass = encoder.begin_compute_pass(&ComputePassDescriptor {
            label: Some("OutputClear compute pass"),
            timestamp_writes: None,
        });
        compute_pass.set_pipeline(&self.pipeline);
        compute_pass.set_bind_group(0, &self.bind_group, &[]);
        compute_pass.dispatch_workgroups(OUTPUT_BUFFER_SIZE as u32 / 4, 1, 1);
    }
}