/**
 * WebGL readback into a canvas, the right way up.
 *
 * Its own module because two debug pages need it and neither should pull in the
 * other's dependencies to get it. It lived in checks/gallery.js, and importing
 * it from the filmstrip dragged the entire gallery — the engine, the song bank,
 * the look generator, the whole scene library — into a page that wanted ten
 * lines of pixel copying.
 */
export function blit(canvas, pixels, width, height) {
    canvas.width = width;
    canvas.height = height;
    const ctx = canvas.getContext('2d');
    const image = ctx.createImageData(width, height);
    const row = width * 4;
    for (let y = 0; y < height; y++) {
        const src = (height - 1 - y) * row;
        image.data.set(pixels.subarray(src, src + row), y * row);
    }
    ctx.putImageData(image, 0, 0);
}