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Initial compute/vertex/fragment render system

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Bradlee Speice 2025-01-20 18:54:24 -05:00
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.vscode/
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[workspace]
resolver = "2"
members = [
"crates/flare",
"crates/flare-shader",
]
[workspace.package]
version = "0.1.0"
authors = []
edition = "2021"
license = "MIT OR Apache-2.0"
[workspace.lints.rust]
unexpected_cfgs = { level = "allow", check-cfg = ['cfg(target_arch, values("spirv"))'] }
[workspace.dependencies]
anyhow = "1.0"
bytemuck = { version = "1.21", features = ["derive"] }
env_logger = "0.11"
futures-executor = "0.3"
glam = { version = "0.29", features = ["bytemuck", "libm"], default-features = false }
spirv-std = { git = "https://github.com/rust-gpu/rust-gpu", rev = "854e9ba7da26d52ca0038ab2c7b252652e4d6b1e" }
#spirv-builder = { git = "https://github.com/rust-gpu/rust-gpu", rev = "854e9ba7da26d52ca0038ab2c7b252652e4d6b1e"}
spirv-builder = { git = "https://github.com/rust-gpu/rust-gpu", rev = "854e9ba7da26d52ca0038ab2c7b252652e4d6b1e", features = ["use-installed-tools"], default-features = false }
wgpu = { version = "24.0", features = ["spirv"] }
winit = "0.30"
[profile.release.build-override]
opt-level = 3

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avoid-breaking-exported-api = false

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[package]
name = "flare-shader"
version.workspace = true
authors.workspace = true
edition.workspace = true
license.workspace = true
[lib]
crate-type = ["dylib", "lib"]
[dependencies]
bytemuck.workspace = true
glam.workspace = true
spirv-std.workspace = true
[lints]
workspace = true

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#![cfg_attr(target_arch = "spirv", no_std)]
use glam::{UVec2, Vec4, Vec4Swizzles, uvec2, vec2, vec4};
use spirv_std::spirv;
#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
#[repr(C)]
pub struct IfsConstants {
accum_width: u32,
accum_height: u32,
viewport_width: u32,
viewport_height: u32,
background_color: Vec4,
}
impl IfsConstants {
pub fn new(
accum_width: u32,
accum_height: u32,
viewport_width: u32,
viewport_height: u32,
background_color: Vec4,
) -> Self {
Self {
accum_width,
accum_height,
viewport_width,
viewport_height,
background_color,
}
}
pub fn viewport_dimensions(&self) -> UVec2 {
uvec2(self.viewport_width, self.viewport_height)
}
pub fn with_accumulate(&mut self, width: u32, height: u32) {
self.accum_width = width;
self.accum_height = height;
}
pub fn with_viewport(&mut self, width: u32, height: u32) {
self.viewport_width = width;
self.viewport_height = height;
}
}
pub trait Color {
type Element;
const BLACK: Self;
const WHITE: Self;
}
impl Color for Vec4 {
type Element = f32;
const BLACK: Self = vec4(0., 0., 0., 1.);
const WHITE: Self = vec4(1., 1., 1., 1.);
}
pub(crate) fn image_index(pixel_x: usize, pixel_y: usize, image_width: u32) -> usize {
pixel_x + pixel_y * image_width as usize
}
#[spirv(compute(threads(1)))]
pub fn main_cs(
#[spirv(push_constant)] constants: &IfsConstants,
#[spirv(storage_buffer, descriptor_set = 0, binding = 0)] accum_image: &mut [Vec4],
) {
let block_size = 64;
for i_width in 0..constants.accum_width as usize {
for i_height in 0..constants.accum_height as usize {
let color = if (i_width / block_size % 2 == 1) != (i_height / block_size % 2 == 1) {
Vec4::BLACK
} else {
Vec4::WHITE
};
accum_image[image_index(i_width, i_height, constants.accum_width)] = color;
}
}
}
#[spirv(vertex)]
pub fn main_vs(
#[spirv(vertex_index)] vert_id: u32,
#[spirv(position, invariant)] position: &mut Vec4,
) {
// Create a "quad" that fills the viewport for the fragment shader.
// The `draw` call issued by the main application will be for three vertex ID's (0, 1, 2).
// This code maps them to the points (-1, -1), (3, -1), and (-1, 3) respectively.
// Because the interior of that triangle covers the entire viewport,
// the GPU clips to the viewport and invokes the fragment shader for each pixel.
// https://stackoverflow.com/a/59739538
// https://www.saschawillems.de/blog/2016/08/13/vulkan-tutorial-on-rendering-a-fullscreen-quad-without-buffers/
let output_uv = vec2(((vert_id << 1) & 2) as f32, (vert_id & 2) as f32);
*position = (output_uv * 2.0 - 1.0, 0.0, 1.0).into();
}
#[spirv(fragment)]
pub fn main_fs(
#[spirv(frag_coord)] frag_coord: Vec4,
#[spirv(push_constant)] ifs_constants: &IfsConstants,
#[spirv(storage_buffer, descriptor_set = 0, binding = 0)] accum_image: &[Vec4],
output: &mut Vec4,
) {
// Bootleg texture sampling; map from viewport image pixel coordinates to accumulator image
// pixel coordinates
let viewport_coordinate = frag_coord.xy().as_uvec2();
let a_width = ifs_constants.accum_width as f32;
let a_height = ifs_constants.accum_height as f32;
let v_width = ifs_constants.viewport_width as f32;
let v_height = ifs_constants.viewport_height as f32;
// Scale both width and height by the same factor; preserves aspect ratio
let scale_width = a_width / v_width;
let scale_height = a_height / v_height;
let scale = scale_width.max(scale_height);
// Re-center the image in the viewport after scale
let offset_x = (v_width * scale - a_width) / 2.0;
let offset_y = (v_height * scale - a_height) / 2.0;
let accum_coordinate = viewport_coordinate.as_vec2() * scale - vec2(offset_x, offset_y);
if accum_coordinate.x < 0.0
|| accum_coordinate.x >= ifs_constants.accum_width as f32
|| accum_coordinate.y < 0.0
|| accum_coordinate.y >= ifs_constants.accum_height as f32
{
*output = ifs_constants.background_color;
} else {
*output = accum_image[image_index(
accum_coordinate.x as usize,
accum_coordinate.y as usize,
ifs_constants.accum_width,
)];
}
}

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[package]
name = "flare"
version.workspace = true
authors.workspace = true
edition.workspace = true
license.workspace = true
[dependencies]
anyhow.workspace = true
bytemuck.workspace = true
env_logger.workspace = true
flare-shader = { path = "../flare-shader" }
futures-executor.workspace = true
glam.workspace = true
wgpu.workspace = true
winit.workspace = true
[build-dependencies]
spirv-builder.workspace = true
[lints]
workspace = true

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use spirv_builder::{MetadataPrintout, SpirvBuilder};
use std::path::PathBuf;
use std::{env, fs};
fn main() -> Result<(), Box<dyn std::error::Error>> {
let result = SpirvBuilder::new("../flare-shader", "spirv-unknown-vulkan1.1")
.print_metadata(MetadataPrintout::Full)
.release(false)
.build()?;
// Copy the SPIR-V to this crate's output directory
let shader_path = result.module.unwrap_single();
let output_path = PathBuf::from(env::var("OUT_DIR")?).join("flare.spv");
fs::copy(shader_path, &output_path)?;
println!("Generated shader; path={}", output_path.display());
Ok(())
}

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use flare_shader::{Color, IfsConstants};
use futures_executor::block_on;
use glam::Vec4;
use std::sync::Arc;
use wgpu::{
Adapter, Device, Features, Instance, Queue, ShaderModule, Surface, SurfaceConfiguration,
};
use winit::event::MouseButton;
use winit::{
application::ApplicationHandler,
dpi::LogicalSize,
event::WindowEvent,
event_loop::{ActiveEventLoop, EventLoop},
window::{Window, WindowAttributes, WindowId},
};
struct AccumulatePipeline {
pipeline: wgpu::ComputePipeline,
}
impl AccumulatePipeline {
pub fn new(device: &Device, module: &ShaderModule) -> Self {
let bindgroup_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
label: Some("accumulate"),
entries: &[wgpu::BindGroupLayoutEntry {
binding: 0,
count: None,
visibility: wgpu::ShaderStages::COMPUTE,
ty: wgpu::BindingType::Buffer {
has_dynamic_offset: false,
min_binding_size: None,
ty: wgpu::BufferBindingType::Storage { read_only: false },
},
}],
});
let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
label: Some("accumulate"),
bind_group_layouts: &[&bindgroup_layout],
push_constant_ranges: &[wgpu::PushConstantRange {
stages: wgpu::ShaderStages::COMPUTE,
range: 0..size_of::<IfsConstants>() as u32,
}],
});
let pipeline = device.create_compute_pipeline(&wgpu::ComputePipelineDescriptor {
label: Some("accumulate"),
layout: Some(&pipeline_layout),
module,
entry_point: Some("main_cs"),
compilation_options: Default::default(),
cache: None,
});
Self { pipeline }
}
}
struct AccumulatePass {
accum_buffer: wgpu::Buffer,
bind_group: wgpu::BindGroup,
}
impl AccumulatePass {
pub fn new(device: &Device, pipeline: &AccumulatePipeline, dimensions: (u32, u32)) -> Self {
let pixels = dimensions.0 * dimensions.1;
let elements = pixels * 4;
let accum_buffer = device.create_buffer(&wgpu::BufferDescriptor {
label: Some("accumulate"),
size: elements as u64 * size_of::<f32>() as u64,
usage: wgpu::BufferUsages::STORAGE,
mapped_at_creation: false,
});
let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
label: Some("accumulate"),
layout: &pipeline.pipeline.get_bind_group_layout(0),
entries: &[wgpu::BindGroupEntry {
binding: 0,
resource: accum_buffer.as_entire_binding(),
}],
});
Self {
accum_buffer,
bind_group,
}
}
}
struct RenderPipeline {
pipeline: wgpu::RenderPipeline,
}
impl RenderPipeline {
pub fn new(device: &Device, module: &ShaderModule, format: wgpu::TextureFormat) -> Self {
let bindgroup_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
label: Some("render"),
entries: &[wgpu::BindGroupLayoutEntry {
binding: 0,
count: None,
visibility: wgpu::ShaderStages::FRAGMENT,
ty: wgpu::BindingType::Buffer {
has_dynamic_offset: false,
min_binding_size: None,
ty: wgpu::BufferBindingType::Storage { read_only: true },
},
}],
});
let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
label: Some("render"),
bind_group_layouts: &[&bindgroup_layout],
push_constant_ranges: &[wgpu::PushConstantRange {
stages: wgpu::ShaderStages::FRAGMENT,
range: 0..size_of::<IfsConstants>() as u32,
}],
});
let pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
label: Some("render"),
layout: Some(&pipeline_layout),
vertex: wgpu::VertexState {
module,
entry_point: Some("main_vs"),
compilation_options: Default::default(),
buffers: &[],
},
primitive: Default::default(),
depth_stencil: None,
multisample: Default::default(),
fragment: Some(wgpu::FragmentState {
module,
entry_point: Some("main_fs"),
compilation_options: Default::default(),
targets: &[Some(wgpu::ColorTargetState {
format,
blend: None,
write_mask: Default::default(),
})],
}),
multiview: None,
cache: None,
});
Self { pipeline }
}
}
struct RenderPass {
bind_group: wgpu::BindGroup,
}
impl RenderPass {
pub fn new(device: &Device, pipeline: &RenderPipeline, accum_buffer: &wgpu::Buffer) -> Self {
let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
label: Some("render"),
layout: &pipeline.pipeline.get_bind_group_layout(0),
entries: &[wgpu::BindGroupEntry {
binding: 0,
resource: accum_buffer.as_entire_binding(),
}],
});
Self { bind_group }
}
}
struct Flare {
instance: Instance,
adapter: Adapter,
device: Device,
queue: Queue,
module: ShaderModule,
}
impl Flare {
pub fn new() -> Self {
let backends = wgpu::Backends::from_env().unwrap_or_default();
let instance = Instance::new(&wgpu::InstanceDescriptor {
backends,
..Default::default()
});
let adapter = instance.request_adapter(&wgpu::RequestAdapterOptions {
power_preference: wgpu::PowerPreference::HighPerformance,
force_fallback_adapter: false,
compatible_surface: None,
});
let adapter = block_on(adapter).expect("Failed to find GPU adapter");
let required_limits = wgpu::Limits {
max_push_constant_size: size_of::<IfsConstants>() as u32,
..Default::default()
};
let device = adapter.request_device(
&wgpu::DeviceDescriptor {
label: Some("flare"),
required_features: Features::TIMESTAMP_QUERY | Features::PUSH_CONSTANTS,
required_limits,
memory_hints: Default::default(),
},
None,
);
let (device, queue) = block_on(device).expect("Failed to find GPU device");
let module = device
.create_shader_module(wgpu::include_spirv!(concat!(env!("OUT_DIR"), "/flare.spv")));
Flare {
instance,
adapter,
device,
queue,
module,
}
}
}
struct FlareRender<'window> {
flare: Arc<Flare>,
surface: Surface<'window>,
surface_configuration: SurfaceConfiguration,
accumulate_pipeline: AccumulatePipeline,
accumulate_pass: AccumulatePass,
render_pipeline: RenderPipeline,
render_pass: RenderPass,
ifs_constants: IfsConstants,
}
impl FlareRender<'_> {
pub fn new(flare: Arc<Flare>, window: Arc<Window>) -> Self {
let window_size = window.inner_size();
let surface = flare
.instance
.create_surface(window.clone())
.expect("Unable to create surface");
let mut surface_configuration = surface
.get_default_config(&flare.adapter, window_size.width, window_size.height)
.expect("Unable to get surface config");
surface_configuration.present_mode = wgpu::PresentMode::AutoVsync;
surface.configure(&flare.device, &surface_configuration);
let accumulate_pipeline = AccumulatePipeline::new(&flare.device, &flare.module);
let accumulate_pass = AccumulatePass::new(
&flare.device,
&accumulate_pipeline,
(window_size.width, window_size.height),
);
let render_pipeline =
RenderPipeline::new(&flare.device, &flare.module, surface_configuration.format);
let render_pass = RenderPass::new(
&flare.device,
&render_pipeline,
&accumulate_pass.accum_buffer,
);
let ifs_constants = IfsConstants::new(
window_size.width,
window_size.height,
window_size.width,
window_size.height,
Vec4::BLACK,
);
Self {
flare,
surface,
surface_configuration,
accumulate_pipeline,
accumulate_pass,
render_pipeline,
render_pass,
ifs_constants,
}
}
fn begin_accumulate(&self, encoder: &mut wgpu::CommandEncoder) {
let mut pass = encoder.begin_compute_pass(&wgpu::ComputePassDescriptor {
label: Some("accumulate"),
timestamp_writes: None,
});
pass.set_pipeline(&self.accumulate_pipeline.pipeline);
pass.set_push_constants(0, bytemuck::cast_slice(&[self.ifs_constants]));
pass.set_bind_group(0, &self.accumulate_pass.bind_group, &[]);
pass.dispatch_workgroups(1, 1, 1);
}
fn begin_render(&self, encoder: &mut wgpu::CommandEncoder, output_view: &wgpu::TextureView) {
let mut pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
label: Some("render"),
color_attachments: &[Some(wgpu::RenderPassColorAttachment {
view: output_view,
resolve_target: None,
ops: Default::default(),
})],
depth_stencil_attachment: None,
timestamp_writes: None,
occlusion_query_set: None,
});
pass.set_pipeline(&self.render_pipeline.pipeline);
pass.set_push_constants(
wgpu::ShaderStages::FRAGMENT,
0,
bytemuck::cast_slice(&[self.ifs_constants]),
);
pass.set_bind_group(0, &self.render_pass.bind_group, &[]);
pass.draw(0..3, 0..1);
}
pub fn render(&self, run_accumulate: bool) {
let output = self
.surface
.get_current_texture()
.expect("Failed to get current texture");
let output_view = output.texture.create_view(&Default::default());
let mut encoder = self
.flare
.device
.create_command_encoder(&Default::default());
if run_accumulate {
self.begin_accumulate(&mut encoder);
}
self.begin_render(&mut encoder, &output_view);
self.flare.queue.submit(Some(encoder.finish()));
output.present();
}
pub fn resize_accumulate(&mut self) {
let vp_dimensions = self.ifs_constants.viewport_dimensions();
self.accumulate_pass = AccumulatePass::new(
&self.flare.device,
&self.accumulate_pipeline,
(vp_dimensions.x, vp_dimensions.y),
);
self.render_pass = RenderPass::new(
&self.flare.device,
&self.render_pipeline,
&self.accumulate_pass.accum_buffer,
);
self.ifs_constants
.with_accumulate(vp_dimensions.x, vp_dimensions.y);
}
pub fn resize_viewport(&mut self, width: u32, height: u32) {
self.surface_configuration.width = width;
self.surface_configuration.height = height;
self.surface
.configure(&self.flare.device, &self.surface_configuration);
self.ifs_constants.with_viewport(width, height);
}
}
struct Application<'window> {
flare: Arc<Flare>,
window: Option<Arc<Window>>,
flare_render: Option<FlareRender<'window>>,
}
impl Application<'_> {
pub fn new() -> Self {
Self {
flare: Arc::new(Flare::new()),
window: None,
flare_render: None,
}
}
}
impl ApplicationHandler for Application<'_> {
fn resumed(&mut self, event_loop: &ActiveEventLoop) {
let attributes = WindowAttributes::default()
.with_title("Flare")
.with_inner_size(LogicalSize::new(1024, 768));
let window = Arc::new(
event_loop
.create_window(attributes)
.expect("Failed to create window"),
);
self.window = Some(window.clone());
let flare_render = FlareRender::new(self.flare.clone(), window);
flare_render.render(true);
self.flare_render = Some(flare_render);
}
fn window_event(
&mut self,
event_loop: &ActiveEventLoop,
_window_id: WindowId,
event: WindowEvent,
) {
match event {
WindowEvent::Resized(size) => {
let flare_render = self.flare_render.as_mut().unwrap();
flare_render.resize_viewport(size.width, size.height);
flare_render.render(false);
}
WindowEvent::MouseInput {
button: MouseButton::Left,
..
} => {
let flare_render = self.flare_render.as_mut().unwrap();
flare_render.resize_accumulate();
flare_render.render(true);
}
WindowEvent::CloseRequested => event_loop.exit(),
_ => (),
}
}
}
pub fn main() -> anyhow::Result<()> {
env_logger::init();
let _module = wgpu::include_spirv!(concat!(env!("OUT_DIR"), "/flare.spv"));
let event_loop = EventLoop::new()?;
let mut application = Application::new();
event_loop.run_app(&mut application)?;
Ok(())
}

4
rust-toolchain.toml Normal file
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[toolchain]
channel = "nightly-2024-11-22"
components = ["rust-src", "rustc-dev", "llvm-tools"]
# commit_hash = b19329a37cedf2027517ae22c87cf201f93d776e

1
rustfmt.toml Normal file
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style_edition = "2024"