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compute_readback.rs

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use processing::prelude::*;

fn main() {

match run() {

Ok(_) => exit(0).unwrap(),

Err(e) => {

eprintln!("{e:?}");

exit(1).unwrap();

}

fn run() -> error::Result<()> {

init(Config::default())?;

let surface = surface_create_offscreen(1, 1, 1.0, TextureFormat::Rgba8Unorm)?;

let _graphics = graphics_create(surface, 1, 1, TextureFormat::Rgba8Unorm)?;

let buf = buffer_create(16)?;

let shader_src = r#"

@group(0) @binding(0)

var<storage, read_write> output: array<u32>;

@compute @workgroup_size(1)

fn main() {

output[0] = 1u;

output[1] = 2u;

output[2] = 3u;

output[3] = 4u;

}

"#;

let shader = shader_create(shader_src)?;

let compute = compute_create(shader)?;

compute_set(compute, "output", shader_value::ShaderValue::Buffer(buf))?;

compute_dispatch(compute, 1, 1, 1)?;

let data = buffer_read(buf)?;

let values: Vec<u32> = data

.chunks_exact(4)

.map(|c| u32::from_le_bytes([c[0], c[1], c[2], c[3]]))

.collect();

assert_eq!(values, vec![1, 2, 3, 4]);

let double_src = r#"

@group(0) @binding(0)

var<storage, read_write> data: array<f32>;

@compute @workgroup_size(4)

fn main(@builtin(global_invocation_id) id: vec3<u32>) {

data[id.x] = data[id.x] * 2.0;

}

"#;

let buf2_data: Vec<u8> = [1.0f32, 2.0, 3.0, 4.0]

.iter()

.flat_map(|f| f.to_le_bytes())

.collect();

let buf2 = buffer_create_with_data(buf2_data)?;

let shader2 = shader_create(double_src)?;

let compute2 = compute_create(shader2)?;

compute_set(compute2, "data", shader_value::ShaderValue::Buffer(buf2))?;

compute_dispatch(compute2, 1, 1, 1)?;

let data2 = buffer_read(buf2)?;

let floats: Vec<f32> = data2

.chunks_exact(4)

.map(|c| f32::from_le_bytes([c[0], c[1], c[2], c[3]]))

.collect();

assert_eq!(floats, vec![2.0, 4.0, 6.0, 8.0]);

compute_destroy(compute)?;

compute_destroy(compute2)?;

shader_destroy(shader)?;

shader_destroy(shader2)?;

buffer_destroy(buf)?;

buffer_destroy(buf2)?;

Ok(())

}