gizmo-renderer 0.1.3

A custom ECS and physics engine aimed for realistic simulations.
Documentation 
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use super::types::GpuParticle;

pub struct ParticlePipelines {
    pub compute_pipeline: wgpu::ComputePipeline,
    pub compute_bind_group: wgpu::BindGroup,
    pub render_pipeline: wgpu::RenderPipeline,
}

pub fn create_particle_pipelines(
    device: &wgpu::Device,
    global_bind_group_layout: &wgpu::BindGroupLayout,
    output_format: wgpu::TextureFormat,
    params_buffer: &wgpu::Buffer,
    particles_buffer: &wgpu::Buffer,
) -> ParticlePipelines {
    let compute_bind_group_layout =
        device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
            entries: &[
                wgpu::BindGroupLayoutEntry {
                    binding: 0,
                    visibility: wgpu::ShaderStages::COMPUTE,
                    ty: wgpu::BindingType::Buffer {
                        ty: wgpu::BufferBindingType::Uniform,
                        has_dynamic_offset: false,
                        min_binding_size: None,
                    },
                    count: None,
                },
                wgpu::BindGroupLayoutEntry {
                    binding: 1,
                    visibility: wgpu::ShaderStages::COMPUTE,
                    ty: wgpu::BindingType::Buffer {
                        ty: wgpu::BufferBindingType::Storage { read_only: false },
                        has_dynamic_offset: false,
                        min_binding_size: None,
                    },
                    count: None,
                },
            ],
            label: Some("particle_compute_layout"),
        });

    let compute_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
        layout: &compute_bind_group_layout,
        entries: &[
            wgpu::BindGroupEntry {
                binding: 0,
                resource: params_buffer.as_entire_binding(),
            },
            wgpu::BindGroupEntry {
                binding: 1,
                resource: particles_buffer.as_entire_binding(),
            },
        ],
        label: Some("particle_compute_bind_group"),
    });

    let compute_shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
        label: Some("Particle Compute Shader"),
        source: wgpu::ShaderSource::Wgsl(include_str!("../shaders/particle_compute.wgsl").into()),
    });

    let compute_pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
        label: Some("Particle Compute Pipeline Layout"),
        bind_group_layouts: &[&compute_bind_group_layout],
        push_constant_ranges: &[],
    });

    let compute_pipeline = device.create_compute_pipeline(&wgpu::ComputePipelineDescriptor {
        label: Some("Particle Compute Pipeline"),
        layout: Some(&compute_pipeline_layout),
        module: &compute_shader,
        entry_point: "main",
        compilation_options: Default::default(),
    });

    let render_shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
        label: Some("Particle Render Shader"),
        source: wgpu::ShaderSource::Wgsl(include_str!("../shaders/particle_render.wgsl").into()),
    });

    let render_pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
        label: Some("Particle Render Pipeline Layout"),
        bind_group_layouts: &[global_bind_group_layout],
        push_constant_ranges: &[],
    });

    let render_pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
        label: Some("Particle Render Pipeline"),
        layout: Some(&render_pipeline_layout),
        vertex: wgpu::VertexState {
            module: &render_shader,
            entry_point: "vs_main",
            compilation_options: Default::default(),
            buffers: &[
                wgpu::VertexBufferLayout {
                    array_stride: std::mem::size_of::<[f32; 2]>() as wgpu::BufferAddress,
                    step_mode: wgpu::VertexStepMode::Vertex,
                    attributes: &wgpu::vertex_attr_array![4 => Float32x2],
                },
                GpuParticle::desc(),
            ],
        },
        fragment: Some(wgpu::FragmentState {
            module: &render_shader,
            entry_point: "fs_main",
            compilation_options: Default::default(),
            targets: &[Some(wgpu::ColorTargetState {
                format: output_format,
                blend: Some(wgpu::BlendState::ALPHA_BLENDING),
                write_mask: wgpu::ColorWrites::ALL,
            })],
        }),
        primitive: wgpu::PrimitiveState {
            topology: wgpu::PrimitiveTopology::TriangleStrip,
            front_face: wgpu::FrontFace::Ccw,
            cull_mode: None,
            ..Default::default()
        },
        depth_stencil: Some(wgpu::DepthStencilState {
            format: wgpu::TextureFormat::Depth32Float,
            depth_write_enabled: false,
            depth_compare: wgpu::CompareFunction::Less,
            stencil: wgpu::StencilState::default(),
            bias: wgpu::DepthBiasState::default(),
        }),
        multisample: wgpu::MultisampleState::default(),
        multiview: None,
    });

    ParticlePipelines {
        compute_pipeline,
        compute_bind_group,
        render_pipeline,
    }
}