cranpose-render-wgpu 0.9.21

GPU renderer for Cranpose scenes through wgpu
Documentation 
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use super::*;

#[test]
fn discarded_copies_and_reused_staging_keep_destination_offsets() {
    let (_lock, device, queue) = super::super::upload_test_device();
    let destination = device.create_buffer(&wgpu::BufferDescriptor {
        label: None,
        size: 16,
        usage: wgpu::BufferUsages::COPY_SRC | wgpu::BufferUsages::COPY_DST,
        mapped_at_creation: false,
    });
    let readback = device.create_buffer(&wgpu::BufferDescriptor {
        label: None,
        size: 16,
        usage: wgpu::BufferUsages::MAP_READ | wgpu::BufferUsages::COPY_DST,
        mapped_at_creation: false,
    });
    let mut uploads = BufferUploads::default();
    let mut expected = [0u8; 16];
    for frame in 1..=24u8 {
        let mut abandoned = device.create_command_encoder(&Default::default());
        uploads.write(&device, Some(&mut abandoned), &destination, 0, &[255; 4]);
        drop(abandoned);
        uploads.reset();

        let mut encoder = device.create_command_encoder(&Default::default());
        let offset = 4 + usize::from(frame % 3) * 4;
        expected[offset..offset + 4].fill(frame);
        uploads.write(
            &device,
            Some(&mut encoder),
            &destination,
            offset as u64,
            &[frame; 4],
        );
        encoder.copy_buffer_to_buffer(&destination, 0, &readback, 0, 16);
        uploads.finish();
        let submission = queue.submit([encoder.finish()]);
        uploads.recall();
        assert_eq!(
            super::super::read_uploaded_bytes(&device, &readback, submission),
            expected
        );
        uploads.reset();
    }
}

#[test]
fn a_write_longer_than_a_staging_chunk_lands_whole_at_its_offset() {
    const OFFSET: usize = 8;
    const LEN: usize = 2 * STAGING_CHUNK_BYTES as usize + 1_000;
    let (_lock, device, queue) = super::super::upload_test_device();
    let size = (OFFSET + LEN) as u64;
    let destination = device.create_buffer(&wgpu::BufferDescriptor {
        label: None,
        size,
        usage: wgpu::BufferUsages::COPY_SRC | wgpu::BufferUsages::COPY_DST,
        mapped_at_creation: false,
    });
    let readback = device.create_buffer(&wgpu::BufferDescriptor {
        label: None,
        size,
        usage: wgpu::BufferUsages::MAP_READ | wgpu::BufferUsages::COPY_DST,
        mapped_at_creation: false,
    });
    let bytes: Vec<u8> = (0..LEN).map(|index| (index % 251) as u8).collect();
    let mut uploads = BufferUploads::default();
    let mut encoder = device.create_command_encoder(&Default::default());
    let written = uploads.write(
        &device,
        Some(&mut encoder),
        &destination,
        OFFSET as u64,
        &bytes,
    );
    encoder.copy_buffer_to_buffer(&destination, 0, &readback, 0, size);
    uploads.finish();
    let submission = queue.submit([encoder.finish()]);
    uploads.recall();
    assert_eq!(written, LEN as u64);
    let read = super::super::read_uploaded_bytes(&device, &readback, submission);
    assert_eq!(&read[..OFFSET], &[0; OFFSET]);
    assert!(
        read[OFFSET..] == bytes[..],
        "every piece of the write lands at its place"
    );
}

#[test]
fn queued_writes_land_in_order_across_frames_and_buffers() {
    let (_lock, device, queue) = super::super::upload_test_device();
    let buffer = |size: u64, usage: wgpu::BufferUsages| {
        device.create_buffer(&wgpu::BufferDescriptor {
            label: None,
            size,
            usage,
            mapped_at_creation: false,
        })
    };
    let copy = wgpu::BufferUsages::COPY_SRC | wgpu::BufferUsages::COPY_DST;
    let read = wgpu::BufferUsages::MAP_READ | wgpu::BufferUsages::COPY_DST;
    let first = buffer(32, copy);
    let second = buffer(16, copy);
    let readback = [buffer(32, read), buffer(16, read)];
    let mut uploads = BufferUploads::default();
    let mut expected = ([0u8; 32], [0u8; 16]);
    for frame in 1..=6u8 {
        let large = vec![frame; 4 * (1 + usize::from(frame) * 3000)];
        let scratch = buffer(large.len() as u64, copy);
        uploads.queued.stage(&first, 0, &[frame; 8]);
        uploads.queued.stage(&first, 8, &[frame + 100; 4]);
        uploads.queued.stage(&second, 4, &[frame; 8]);
        uploads.queued.stage(&scratch, 0, &large);
        uploads.queued.stage(&first, 4, &[frame + 50; 8]);
        uploads.queued.stage(&second, 0, &[]);
        expected.0[..4].fill(frame);
        expected.0[4..12].fill(frame + 50);
        expected.1[4..12].fill(frame);
        uploads.flush_queued(&device, &queue);
        let mut encoder = uploads
            .take_before_passes()
            .expect("queued writes copy ahead of the passes");
        encoder.copy_buffer_to_buffer(&first, 0, &readback[0], 0, 32);
        encoder.copy_buffer_to_buffer(&second, 0, &readback[1], 0, 16);
        let submission = queue.submit([encoder.finish()]);
        assert_eq!(
            super::super::read_uploaded_bytes(&device, &readback[0], submission.clone()),
            expected.0
        );
        assert_eq!(
            super::super::read_uploaded_bytes(&device, &readback[1], submission),
            expected.1
        );
        uploads.reset();
    }
}