//! A Rust-y version of
//! [`webgpu:api,validation,queue,writeTexture:sample_count:*`](https://github.com/gpuweb/cts/blob/26530c7da1c48ea5d0bf4c5da83b15b996eb522f/src/webgpu/api/validation/queue/writeTexture.spec.ts#L60-L85).

use pollster::FutureExt as _;

fn main() {
    env_logger::init();

    let instance = wgpu::Instance::new(&wgpu::InstanceDescriptor::from_env_or_default());
    let adapter = instance
        .request_adapter(&Default::default())
        .block_on()
        .unwrap();
    let (device, queue) = adapter
        .request_device(&Default::default())
        .block_on()
        .unwrap();

    for sample_count in [1, 4] {
        let texture = device.create_texture(&wgpu::TextureDescriptor {
            label: None,
            size: wgpu::Extent3d {
                width: 16,
                height: 16,
                depth_or_array_layers: 1,
            },
            mip_level_count: 1,
            sample_count,
            dimension: wgpu::TextureDimension::D2,
            format: wgpu::TextureFormat::Bgra8Unorm,
            usage: wgpu::TextureUsages::COPY_DST | wgpu::TextureUsages::RENDER_ATTACHMENT,
            view_formats: &[],
        });

        let data = [0u8; 16];
        let size = wgpu::Extent3d {
            width: 1,
            height: 1,
            depth_or_array_layers: 1,
        };

        let is_valid = sample_count == 1;

        device.push_error_scope(wgpu::ErrorFilter::Validation);

        queue.write_texture(
            wgpu::TexelCopyTextureInfoBase {
                texture: &texture,
                mip_level: 0,
                origin: Default::default(),
                aspect: Default::default(),
            },
            &data,
            Default::default(),
            size,
        );

        match (is_valid, device.pop_error_scope().block_on()) {
            (true, None) | (false, Some(..)) => (),
            (expected_valid, err_opt) => panic!(
                concat!(
                    "expected valid = {} for `sample_count` = {}, ",
                    "but error scope yielded {:?}"
                ),
                expected_valid, sample_count, err_opt
            ),
        }
    }
}