block_compression 0.9.0

Texture block compression using WGPU compute shader
Documentation 
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use block_compression::*;
use wgpu::{CommandEncoderDescriptor, ComputePassDescriptor, TextureViewDescriptor};

use crate::common::{
    create_blocks_buffer, create_wgpu_resources, download_blocks_data,
    read_image_and_create_texture, BRICK_FILE_PATH, MARBLE_FILE_PATH,
};

mod common;

fn test_multi_task_compression(variant: CompressionVariant) {
    let (device, queue) = create_wgpu_resources();
    let mut block_compressor = GpuBlockCompressor::new(device.clone(), queue.clone());

    let (brick_texture, _) =
        read_image_and_create_texture(&device, &queue, BRICK_FILE_PATH, variant);
    let (marble_texture, _) =
        read_image_and_create_texture(&device, &queue, MARBLE_FILE_PATH, variant);

    let brick_height = brick_texture.height();
    let marble_height = marble_texture.height();

    // Split heights in half (rounded to multiple of 4)
    let brick_half_height = (brick_height / 2) & !3;
    let marble_half_height = (marble_height / 2) & !3;

    let bricks_half_size = variant.blocks_byte_size(brick_texture.width(), brick_half_height);
    let marble_half_size = variant.blocks_byte_size(marble_texture.width(), marble_half_height);
    let total_size = (bricks_half_size * 2) + (marble_half_size * 2);

    let blocks = create_blocks_buffer(&device, total_size as u64);

    block_compressor.add_compression_task(
        variant,
        &brick_texture.create_view(&TextureViewDescriptor::default()),
        brick_texture.width(),
        brick_half_height,
        &blocks,
        None,
        None,
    );
    block_compressor.add_compression_task(
        variant,
        &brick_texture.create_view(&TextureViewDescriptor::default()),
        brick_texture.width(),
        brick_half_height,
        &blocks,
        Some(brick_half_height),
        Some(bricks_half_size as u32),
    );

    block_compressor.add_compression_task(
        variant,
        &marble_texture.create_view(&TextureViewDescriptor::default()),
        marble_texture.width(),
        marble_half_height,
        &blocks,
        None,
        Some((bricks_half_size * 2) as u32),
    );
    block_compressor.add_compression_task(
        variant,
        &marble_texture.create_view(&TextureViewDescriptor::default()),
        marble_texture.width(),
        marble_half_height,
        &blocks,
        Some(marble_half_height),
        Some((bricks_half_size * 2 + marble_half_size) as u32),
    );

    let mut encoder = device.create_command_encoder(&CommandEncoderDescriptor {
        label: Some("command encoder"),
    });

    {
        let mut pass = encoder.begin_compute_pass(&ComputePassDescriptor {
            label: Some("compute pass"),
            timestamp_writes: None,
        });

        block_compressor.compress(&mut pass);
    }

    queue.submit([encoder.finish()]);

    let blocks_data = download_blocks_data(&device, &queue, blocks);

    let brick_first_half_not_empty = !blocks_data[..bricks_half_size]
        .iter()
        .all(|&data| data == 0);
    let brick_second_half_not_empty = !blocks_data[bricks_half_size..bricks_half_size * 2]
        .iter()
        .all(|&data| data == 0);
    let marble_first_half_not_empty = !blocks_data
        [bricks_half_size * 2..bricks_half_size * 2 + marble_half_size]
        .iter()
        .all(|&data| data == 0);
    let marble_second_half_not_empty = !blocks_data[bricks_half_size * 2 + marble_half_size..]
        .iter()
        .all(|&data| data == 0);

    assert!(brick_first_half_not_empty, "Brick first half is empty");
    assert!(brick_second_half_not_empty, "Brick second half is empty");
    assert!(marble_first_half_not_empty, "Marble first half is empty");
    assert!(marble_second_half_not_empty, "Marble second half is empty");
}

#[test]
fn multi_task_compression_bc1() {
    test_multi_task_compression(CompressionVariant::BC1);
}

#[test]
fn multi_task_compression_bc2() {
    test_multi_task_compression(CompressionVariant::BC2);
}

#[test]
fn multi_task_compression_bc3() {
    test_multi_task_compression(CompressionVariant::BC3);
}

#[test]
fn multi_task_compression_bc4() {
    test_multi_task_compression(CompressionVariant::BC4);
}

#[test]
fn multi_task_compression_bc5() {
    test_multi_task_compression(CompressionVariant::BC5);
}

#[test]
fn multi_task_compression_bc6h() {
    test_multi_task_compression(CompressionVariant::BC6H(BC6HSettings::very_fast()));
}

#[test]
fn multi_task_compression_bc7() {
    test_multi_task_compression(CompressionVariant::BC7(BC7Settings::opaque_ultra_fast()));
}