gpu_readback.wgsl

// This shader is used for the gpu_readback example
// The actual work it does is not important for the example

// This is the data that lives in the gpu only buffer
@group(0) @binding(0) var<storage, read_write> data: array<u32>;
@group(0) @binding(1) var texture: texture_storage_2d<r32uint, write>;

@compute @workgroup_size(1)
fn main(@builtin(global_invocation_id) global_id: vec3<u32>) {
    // We use the global_id to index the array to make sure we don't
    // access data used in another workgroup
    data[global_id.x] += 1u;
    // Write the same data to the texture
    textureStore(texture, vec2<i32>(i32(global_id.x), 0), vec4<u32>(data[global_id.x], 0, 0, 0));
}