mirror of
https://github.com/gfx-rs/wgpu.git
synced 2024-11-22 23:04:07 +00:00
630 lines
23 KiB
Rust
630 lines
23 KiB
Rust
extern crate wgpu_hal as hal;
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use hal::{Adapter as _, CommandBuffer as _, Device as _, Instance as _, Queue as _, Surface as _};
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use std::{borrow::Borrow, iter, mem, num::NonZeroU32, ptr, time::Instant};
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const MAX_BUNNIES: usize = 1 << 20;
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const BUNNY_SIZE: f32 = 0.15 * 256.0;
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const GRAVITY: f32 = -9.8 * 100.0;
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const MAX_VELOCITY: f32 = 750.0;
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#[repr(C)]
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#[derive(Clone, Copy)]
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struct Globals {
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mvp: [[f32; 4]; 4],
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size: [f32; 2],
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pad: [f32; 2],
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}
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#[repr(C, align(256))]
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#[derive(Clone, Copy)]
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struct Locals {
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position: [f32; 2],
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velocity: [f32; 2],
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color: u32,
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_pad: u32,
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}
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#[allow(dead_code)]
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struct Example<A: hal::Api> {
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instance: A::Instance,
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surface: A::Surface,
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surface_format: wgt::TextureFormat,
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device: A::Device,
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queue: A::Queue,
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global_group: A::BindGroup,
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local_group: A::BindGroup,
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pipeline_layout: A::PipelineLayout,
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pipeline: A::RenderPipeline,
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bunnies: Vec<Locals>,
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local_buffer: A::Buffer,
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global_buffer: A::Buffer,
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sampler: A::Sampler,
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texture: A::Texture,
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view: A::TextureView,
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fence: A::Fence,
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fence_value: hal::FenceValue,
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old_views: Vec<(hal::FenceValue, A::TextureView)>,
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extent: [u32; 2],
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start: Instant,
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}
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impl<A: hal::Api> Example<A> {
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fn init(window: &winit::window::Window) -> Result<Self, hal::InstanceError> {
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let instance_desc = hal::InstanceDescriptor {
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name: "example",
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flags: hal::InstanceFlag::all(),
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};
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let instance = unsafe { A::Instance::init(&instance_desc)? };
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let mut surface = unsafe { instance.create_surface(window).unwrap() };
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let hal::OpenDevice { device, mut queue } = unsafe {
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let adapters = instance.enumerate_adapters();
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let exposed = adapters.get(0).ok_or(hal::InstanceError)?;
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println!(
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"Surface caps: {:?}",
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exposed.adapter.surface_capabilities(&surface)
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);
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exposed.adapter.open(wgt::Features::empty()).unwrap()
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};
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let window_size: (u32, u32) = window.inner_size().into();
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let surface_config = hal::SurfaceConfiguration {
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swap_chain_size: 2,
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present_mode: wgt::PresentMode::Fifo,
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composite_alpha_mode: hal::CompositeAlphaMode::Opaque,
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format: wgt::TextureFormat::Bgra8UnormSrgb,
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extent: wgt::Extent3d {
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width: window_size.0,
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height: window_size.1,
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depth_or_array_layers: 1,
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},
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usage: hal::TextureUse::COLOR_TARGET,
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};
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unsafe {
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surface.configure(&device, &surface_config).unwrap();
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};
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let naga_shader = {
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let shader_file = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
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.join("examples")
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.join("halmark")
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.join("shader.wgsl");
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let source = std::fs::read_to_string(shader_file).unwrap();
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let module = naga::front::wgsl::Parser::new().parse(&source).unwrap();
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let info = naga::valid::Validator::new(
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naga::valid::ValidationFlags::all(),
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naga::valid::Capabilities::empty(),
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)
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.validate(&module)
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.unwrap();
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hal::NagaShader { module, info }
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};
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let shader_desc = hal::ShaderModuleDescriptor { label: None };
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let shader = unsafe {
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device
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.create_shader_module(&shader_desc, naga_shader)
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.unwrap()
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};
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let global_bgl_desc = hal::BindGroupLayoutDescriptor {
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label: None,
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entries: &[
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wgt::BindGroupLayoutEntry {
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binding: 0,
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visibility: wgt::ShaderStage::VERTEX,
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ty: wgt::BindingType::Buffer {
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ty: wgt::BufferBindingType::Uniform,
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has_dynamic_offset: false,
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min_binding_size: wgt::BufferSize::new(mem::size_of::<Globals>() as _),
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},
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count: None,
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},
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wgt::BindGroupLayoutEntry {
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binding: 1,
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visibility: wgt::ShaderStage::FRAGMENT,
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ty: wgt::BindingType::Texture {
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sample_type: wgt::TextureSampleType::Float { filterable: true },
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view_dimension: wgt::TextureViewDimension::D2,
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multisampled: false,
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},
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count: None,
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},
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wgt::BindGroupLayoutEntry {
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binding: 2,
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visibility: wgt::ShaderStage::FRAGMENT,
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ty: wgt::BindingType::Sampler {
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filtering: true,
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comparison: false,
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},
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count: None,
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},
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],
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};
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let global_bind_group_layout =
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unsafe { device.create_bind_group_layout(&global_bgl_desc).unwrap() };
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let local_bgl_desc = hal::BindGroupLayoutDescriptor {
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entries: &[wgt::BindGroupLayoutEntry {
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binding: 0,
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visibility: wgt::ShaderStage::VERTEX,
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ty: wgt::BindingType::Buffer {
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ty: wgt::BufferBindingType::Uniform,
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has_dynamic_offset: true,
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min_binding_size: wgt::BufferSize::new(mem::size_of::<Locals>() as _),
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},
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count: None,
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}],
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label: None,
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};
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let local_bind_group_layout =
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unsafe { device.create_bind_group_layout(&local_bgl_desc).unwrap() };
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let pipeline_layout_desc = hal::PipelineLayoutDescriptor {
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label: None,
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bind_group_layouts: &[&global_bind_group_layout, &local_bind_group_layout],
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push_constant_ranges: &[],
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};
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let pipeline_layout = unsafe {
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device
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.create_pipeline_layout(&pipeline_layout_desc)
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.unwrap()
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};
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let pipeline_desc = hal::RenderPipelineDescriptor {
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label: None,
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layout: &pipeline_layout,
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vertex_stage: hal::ProgrammableStage {
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module: &shader,
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entry_point: "vs_main",
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},
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vertex_buffers: &[],
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fragment_stage: Some(hal::ProgrammableStage {
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module: &shader,
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entry_point: "fs_main",
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}),
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primitive: wgt::PrimitiveState {
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topology: wgt::PrimitiveTopology::TriangleStrip,
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..wgt::PrimitiveState::default()
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},
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depth_stencil: None,
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multisample: wgt::MultisampleState::default(),
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color_targets: &[wgt::ColorTargetState {
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format: surface_config.format,
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blend: Some(wgt::BlendState::ALPHA_BLENDING),
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write_mask: wgt::ColorWrite::default(),
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}],
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};
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let pipeline = unsafe { device.create_render_pipeline(&pipeline_desc).unwrap() };
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let texture_data = vec![0xFFu8; 4];
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let staging_buffer_desc = hal::BufferDescriptor {
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label: Some("stage"),
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size: texture_data.len() as wgt::BufferAddress,
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usage: hal::BufferUse::MAP_WRITE | hal::BufferUse::COPY_SRC,
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memory_flags: hal::MemoryFlag::TRANSIENT,
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};
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let staging_buffer = unsafe { device.create_buffer(&staging_buffer_desc).unwrap() };
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unsafe {
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let mapping = device
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.map_buffer(&staging_buffer, 0..staging_buffer_desc.size)
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.unwrap();
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ptr::copy_nonoverlapping(
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texture_data.as_ptr(),
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mapping.ptr.as_ptr(),
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texture_data.len(),
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);
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device.unmap_buffer(&staging_buffer).unwrap();
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assert!(mapping.is_coherent);
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}
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let texture_desc = hal::TextureDescriptor {
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label: None,
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size: wgt::Extent3d {
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width: 1,
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height: 1,
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depth_or_array_layers: 1,
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},
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mip_level_count: 1,
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sample_count: 1,
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dimension: wgt::TextureDimension::D2,
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format: wgt::TextureFormat::Rgba8UnormSrgb,
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usage: hal::TextureUse::COPY_DST | hal::TextureUse::SAMPLED,
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memory_flags: hal::MemoryFlag::empty(),
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};
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let texture = unsafe { device.create_texture(&texture_desc).unwrap() };
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let init_cmd_desc = hal::CommandBufferDescriptor {
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label: Some("init"),
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};
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let mut init_cmd = unsafe { device.create_command_buffer(&init_cmd_desc).unwrap() };
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{
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let buffer_barrier = hal::BufferBarrier {
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buffer: &staging_buffer,
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usage: hal::BufferUse::empty()..hal::BufferUse::COPY_SRC,
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};
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let texture_barrier1 = hal::TextureBarrier {
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texture: &texture,
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range: wgt::ImageSubresourceRange::default(),
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usage: hal::TextureUse::UNINITIALIZED..hal::TextureUse::COPY_DST,
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};
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let texture_barrier2 = hal::TextureBarrier {
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texture: &texture,
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range: wgt::ImageSubresourceRange::default(),
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usage: hal::TextureUse::COPY_DST..hal::TextureUse::SAMPLED,
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};
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let copy = hal::BufferTextureCopy {
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buffer_layout: wgt::ImageDataLayout {
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offset: 0,
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bytes_per_row: NonZeroU32::new(4),
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rows_per_image: None,
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},
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texture_base: hal::TextureCopyBase {
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origin: wgt::Origin3d::ZERO,
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mip_level: 0,
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aspect: hal::FormatAspect::COLOR,
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},
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size: texture_desc.size,
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};
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unsafe {
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init_cmd.transition_buffers(iter::once(buffer_barrier));
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init_cmd.transition_textures(iter::once(texture_barrier1));
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init_cmd.copy_buffer_to_texture(&staging_buffer, &texture, iter::once(copy));
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init_cmd.transition_textures(iter::once(texture_barrier2));
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}
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}
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let sampler_desc = hal::SamplerDescriptor {
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label: None,
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address_modes: [wgt::AddressMode::ClampToEdge; 3],
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mag_filter: wgt::FilterMode::Linear,
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min_filter: wgt::FilterMode::Nearest,
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mipmap_filter: wgt::FilterMode::Nearest,
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lod_clamp: None,
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compare: None,
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anisotropy_clamp: None,
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border_color: None,
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};
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let sampler = unsafe { device.create_sampler(&sampler_desc).unwrap() };
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let globals = Globals {
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// cgmath::ortho() projection
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mvp: [
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[2.0 / window_size.0 as f32, 0.0, 0.0, 0.0],
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[0.0, 2.0 / window_size.1 as f32, 0.0, 0.0],
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[0.0, 0.0, 1.0, 0.0],
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[-1.0, -1.0, 0.0, 1.0],
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],
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size: [BUNNY_SIZE; 2],
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pad: [0.0; 2],
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};
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let global_buffer_desc = hal::BufferDescriptor {
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label: Some("global"),
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size: mem::size_of::<Globals>() as wgt::BufferAddress,
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usage: hal::BufferUse::MAP_WRITE | hal::BufferUse::UNIFORM,
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memory_flags: hal::MemoryFlag::empty(),
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};
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let global_buffer = unsafe {
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let buffer = device.create_buffer(&global_buffer_desc).unwrap();
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let mapping = device
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.map_buffer(&buffer, 0..global_buffer_desc.size)
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.unwrap();
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ptr::copy_nonoverlapping(
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&globals as *const Globals as *const u8,
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mapping.ptr.as_ptr(),
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mem::size_of::<Globals>(),
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);
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device.unmap_buffer(&buffer).unwrap();
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assert!(mapping.is_coherent);
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buffer
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};
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let local_buffer_desc = hal::BufferDescriptor {
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label: Some("local"),
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size: (MAX_BUNNIES as wgt::BufferAddress) * wgt::BIND_BUFFER_ALIGNMENT,
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usage: hal::BufferUse::MAP_WRITE | hal::BufferUse::UNIFORM,
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memory_flags: hal::MemoryFlag::empty(),
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};
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let local_buffer = unsafe { device.create_buffer(&local_buffer_desc).unwrap() };
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let view_desc = hal::TextureViewDescriptor {
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label: None,
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format: texture_desc.format,
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dimension: wgt::TextureViewDimension::D2,
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usage: hal::TextureUse::SAMPLED,
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range: wgt::ImageSubresourceRange::default(),
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};
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let view = unsafe { device.create_texture_view(&texture, &view_desc).unwrap() };
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let global_group = {
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let global_buffer_binding = hal::BufferBinding {
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buffer: &global_buffer,
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offset: 0,
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size: None,
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};
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let texture_binding = hal::TextureBinding {
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view: &view,
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usage: hal::TextureUse::SAMPLED,
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};
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let global_group_desc = hal::BindGroupDescriptor {
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label: Some("global"),
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layout: &global_bind_group_layout,
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buffers: &[global_buffer_binding],
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samplers: &[&sampler],
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textures: &[texture_binding],
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entries: &[
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hal::BindGroupEntry {
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binding: 0,
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resource_index: 0,
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},
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hal::BindGroupEntry {
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binding: 1,
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resource_index: 0,
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},
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hal::BindGroupEntry {
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binding: 2,
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resource_index: 0,
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},
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],
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};
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unsafe { device.create_bind_group(&global_group_desc).unwrap() }
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};
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let local_group = {
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let local_buffer_binding = hal::BufferBinding {
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buffer: &local_buffer,
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offset: 0,
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size: wgt::BufferSize::new(mem::size_of::<Locals>() as _),
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};
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let local_group_desc = hal::BindGroupDescriptor {
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label: Some("local"),
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layout: &local_bind_group_layout,
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buffers: &[local_buffer_binding],
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samplers: &[],
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textures: &[],
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entries: &[hal::BindGroupEntry {
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binding: 0,
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resource_index: 0,
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}],
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};
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unsafe { device.create_bind_group(&local_group_desc).unwrap() }
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};
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let fence = unsafe {
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let mut fence = device.create_fence().unwrap();
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init_cmd.finish();
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queue
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.submit(iter::once(init_cmd), Some((&mut fence, 1)))
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.unwrap();
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device.wait(&fence, 1, !0).unwrap();
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device.destroy_buffer(staging_buffer);
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fence
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};
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Ok(Example {
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instance,
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surface,
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surface_format: surface_config.format,
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device,
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queue,
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pipeline_layout,
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pipeline,
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global_group,
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local_group,
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bunnies: Vec::new(),
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local_buffer,
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global_buffer,
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sampler,
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texture,
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view,
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old_views: Vec::new(),
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fence,
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fence_value: 1,
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extent: [window_size.0, window_size.1],
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start: Instant::now(),
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})
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}
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fn update(&mut self, event: winit::event::WindowEvent) {
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if let winit::event::WindowEvent::KeyboardInput {
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input:
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winit::event::KeyboardInput {
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virtual_keycode: Some(winit::event::VirtualKeyCode::Space),
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state: winit::event::ElementState::Pressed,
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..
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},
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..
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} = event
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{
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let spawn_count = 64 + self.bunnies.len() / 2;
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let elapsed = self.start.elapsed();
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let color = elapsed.as_nanos() as u32;
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println!(
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"Spawning {} bunnies, total at {}",
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spawn_count,
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self.bunnies.len() + spawn_count
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);
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for i in 0..spawn_count {
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let random = ((elapsed.as_nanos() * (i + 1) as u128) & 0xFF) as f32 / 255.0;
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let speed = random * MAX_VELOCITY - (MAX_VELOCITY * 0.5);
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self.bunnies.push(Locals {
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position: [0.0, 0.5 * (self.extent[1] as f32)],
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velocity: [speed, 0.0],
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color,
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_pad: 0,
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});
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}
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}
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}
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fn render(&mut self) {
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let delta = 0.01;
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for bunny in self.bunnies.iter_mut() {
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bunny.position[0] += bunny.velocity[0] * delta;
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bunny.position[1] += bunny.velocity[1] * delta;
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bunny.velocity[1] += GRAVITY * delta;
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if (bunny.velocity[0] > 0.0
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&& bunny.position[0] + 0.5 * BUNNY_SIZE > self.extent[0] as f32)
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|| (bunny.velocity[0] < 0.0 && bunny.position[0] - 0.5 * BUNNY_SIZE < 0.0)
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{
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bunny.velocity[0] *= -1.0;
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}
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if bunny.velocity[1] < 0.0 && bunny.position[1] < 0.5 * BUNNY_SIZE {
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bunny.velocity[1] *= -1.0;
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}
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}
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unsafe {
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let size = self.bunnies.len() * wgt::BIND_BUFFER_ALIGNMENT as usize;
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let mapping = self
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.device
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.map_buffer(&self.local_buffer, 0..size as wgt::BufferAddress)
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.unwrap();
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ptr::copy_nonoverlapping(
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self.bunnies.as_ptr() as *const u8,
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mapping.ptr.as_ptr(),
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size,
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);
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assert!(mapping.is_coherent);
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self.device.unmap_buffer(&self.local_buffer).unwrap();
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}
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let mut cmd_buf = unsafe {
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self.device
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.create_command_buffer(&hal::CommandBufferDescriptor {
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label: Some("frame"),
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})
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.unwrap()
|
|
};
|
|
|
|
let surface_tex = unsafe { self.surface.acquire_texture(!0).unwrap().unwrap().texture };
|
|
let surface_view_desc = hal::TextureViewDescriptor {
|
|
label: None,
|
|
format: self.surface_format,
|
|
dimension: wgt::TextureViewDimension::D2,
|
|
usage: hal::TextureUse::COLOR_TARGET,
|
|
range: wgt::ImageSubresourceRange::default(),
|
|
};
|
|
let surface_tex_view = unsafe {
|
|
self.device
|
|
.create_texture_view(surface_tex.borrow(), &surface_view_desc)
|
|
.unwrap()
|
|
};
|
|
let pass_desc = hal::RenderPassDescriptor {
|
|
label: None,
|
|
color_attachments: &[hal::ColorAttachment {
|
|
target: hal::Attachment {
|
|
view: &surface_tex_view,
|
|
usage: hal::TextureUse::COLOR_TARGET,
|
|
boundary_usage: hal::TextureUse::UNINITIALIZED..hal::TextureUse::empty(),
|
|
},
|
|
resolve_target: None,
|
|
ops: hal::AttachmentOp::STORE,
|
|
clear_value: wgt::Color {
|
|
r: 0.1,
|
|
g: 0.2,
|
|
b: 0.3,
|
|
a: 1.0,
|
|
},
|
|
}],
|
|
depth_stencil_attachment: None,
|
|
};
|
|
unsafe {
|
|
cmd_buf.begin_render_pass(&pass_desc);
|
|
cmd_buf.set_render_pipeline(&self.pipeline);
|
|
cmd_buf.set_bind_group(&self.pipeline_layout, 0, &self.global_group, &[]);
|
|
}
|
|
|
|
for i in 0..self.bunnies.len() {
|
|
let offset =
|
|
(i as wgt::DynamicOffset) * (wgt::BIND_BUFFER_ALIGNMENT as wgt::DynamicOffset);
|
|
unsafe {
|
|
cmd_buf.set_bind_group(&self.pipeline_layout, 1, &self.local_group, &[offset]);
|
|
cmd_buf.draw(0, 4, 0, 1);
|
|
}
|
|
}
|
|
|
|
self.fence_value += 1;
|
|
let last_done = unsafe { self.device.get_fence_value(&self.fence).unwrap() };
|
|
self.old_views.retain(|&(value, _)| value <= last_done);
|
|
self.old_views.push((self.fence_value, surface_tex_view));
|
|
|
|
unsafe {
|
|
cmd_buf.end_render_pass();
|
|
cmd_buf.finish();
|
|
self.queue
|
|
.submit(
|
|
iter::once(cmd_buf),
|
|
Some((&mut self.fence, self.fence_value)),
|
|
)
|
|
.unwrap();
|
|
self.queue.present(&mut self.surface, surface_tex).unwrap();
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(feature = "metal")]
|
|
type Api = hal::api::Metal;
|
|
|
|
fn main() {
|
|
let event_loop = winit::event_loop::EventLoop::new();
|
|
let window = winit::window::WindowBuilder::new()
|
|
.with_title("hal-bunnymark")
|
|
.build(&event_loop)
|
|
.unwrap();
|
|
|
|
let example_result = Example::<Api>::init(&window);
|
|
let mut example = example_result.expect("Selected backend is not supported");
|
|
|
|
let mut last_frame_inst = Instant::now();
|
|
let (mut frame_count, mut accum_time) = (0, 0.0);
|
|
|
|
event_loop.run(move |event, _, control_flow| {
|
|
let _ = &window; // force ownership by the closure
|
|
*control_flow = winit::event_loop::ControlFlow::Poll;
|
|
match event {
|
|
winit::event::Event::RedrawEventsCleared => {
|
|
window.request_redraw();
|
|
}
|
|
winit::event::Event::WindowEvent { event, .. } => match event {
|
|
winit::event::WindowEvent::KeyboardInput {
|
|
input:
|
|
winit::event::KeyboardInput {
|
|
virtual_keycode: Some(winit::event::VirtualKeyCode::Escape),
|
|
state: winit::event::ElementState::Pressed,
|
|
..
|
|
},
|
|
..
|
|
}
|
|
| winit::event::WindowEvent::CloseRequested => {
|
|
*control_flow = winit::event_loop::ControlFlow::Exit;
|
|
}
|
|
_ => {
|
|
example.update(event);
|
|
}
|
|
},
|
|
winit::event::Event::RedrawRequested(_) => {
|
|
{
|
|
accum_time += last_frame_inst.elapsed().as_secs_f32();
|
|
last_frame_inst = Instant::now();
|
|
frame_count += 1;
|
|
if frame_count == 100 {
|
|
println!(
|
|
"Avg frame time {}ms",
|
|
accum_time * 1000.0 / frame_count as f32
|
|
);
|
|
accum_time = 0.0;
|
|
frame_count = 0;
|
|
}
|
|
}
|
|
example.render();
|
|
}
|
|
_ => {}
|
|
}
|
|
});
|
|
}
|