/*
 * Copyright (c) 2025 Lynne <dev@lynne.ee>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

TYPE read_data(uint off)
{
#ifdef BIG_ENDIAN
    return TYPE_REVERSE(data[off]);
#else
    return data[off];
#endif
}

void main(void)
{
    ivec2 pos = ivec2(gl_GlobalInvocationID.xy);
    if (!IS_WITHIN(pos, imageSize(dst[0])))
        return;

    uint linesize;
    linesize = align(imageSize(dst[0]).x*BITS_PER_COMP*COMPONENTS, 32);
    linesize >>= BITS_LOG2;

    uint offs = pos.y*linesize + pos.x*COMPONENTS;
#if NB_IMAGES == 1
    TYPE_VEC val;
    for (int i = 0; i < COMPONENTS; i++)
        val[i] = read_data(offs + i);
    val >>= SHIFT;
    imageStore(dst[0], pos, val);
#else
    const ivec4 fmt_lut = ivec4(2, 0, 1, 3);
    for (int i = 0; i < COMPONENTS; i++) {
        TYPE val = read_data(offs + i);
        val >>= SHIFT;
        imageStore(dst[fmt_lut[i]], pos, TYPE_VEC(val));
    }
#endif
}