/*
 * Copyright (c) 2023, Alliance for Open Media. All rights reserved.
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

#include "warp_plane_neon_i8mm.h"

DECLARE_ALIGNED(16, const uint8_t, svt_kTblIdx0_3[16]) = {
    // clang-format off
    0, -1, -1, -1, 1, -1, -1, -1, 2, -1, -1, -1, 3, -1, -1, -1,
    // clang-format on
};

static AOM_FORCE_INLINE void vertical_filter_4x1_f4(const int16x8_t *src, int32x4_t *res, int sy, int gamma) {
    int16x8_t s0, s1, s2, s3;
    transpose_elems_s16_4x8(vget_low_s16(src[0]),
                            vget_low_s16(src[1]),
                            vget_low_s16(src[2]),
                            vget_low_s16(src[3]),
                            vget_low_s16(src[4]),
                            vget_low_s16(src[5]),
                            vget_low_s16(src[6]),
                            vget_low_s16(src[7]),
                            &s0,
                            &s1,
                            &s2,
                            &s3);

    int16x8_t f[4];
    load_filters_4(f, sy, gamma);

    int32x4_t m0 = vmull_s16(vget_low_s16(s0), vget_low_s16(f[0]));
    m0           = vmlal_s16(m0, vget_high_s16(s0), vget_high_s16(f[0]));
    int32x4_t m1 = vmull_s16(vget_low_s16(s1), vget_low_s16(f[1]));
    m1           = vmlal_s16(m1, vget_high_s16(s1), vget_high_s16(f[1]));
    int32x4_t m2 = vmull_s16(vget_low_s16(s2), vget_low_s16(f[2]));
    m2           = vmlal_s16(m2, vget_high_s16(s2), vget_high_s16(f[2]));
    int32x4_t m3 = vmull_s16(vget_low_s16(s3), vget_low_s16(f[3]));
    m3           = vmlal_s16(m3, vget_high_s16(s3), vget_high_s16(f[3]));

    int32x4_t m0123_pairs[] = {m0, m1, m2, m3};

    *res = horizontal_add_4d_s32x4(m0123_pairs);
}

static AOM_FORCE_INLINE void vertical_filter_8x1_f8(const int16x8_t *src, int32x4_t *res_low, int32x4_t *res_high,
                                                    int sy, int gamma) {
    int16x8_t s0 = src[0];
    int16x8_t s1 = src[1];
    int16x8_t s2 = src[2];
    int16x8_t s3 = src[3];
    int16x8_t s4 = src[4];
    int16x8_t s5 = src[5];
    int16x8_t s6 = src[6];
    int16x8_t s7 = src[7];
    transpose_elems_inplace_s16_8x8(&s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7);

    int16x8_t f[8];
    load_filters_8(f, sy, gamma);

    int32x4_t m0 = vmull_s16(vget_low_s16(s0), vget_low_s16(f[0]));
    m0           = vmlal_s16(m0, vget_high_s16(s0), vget_high_s16(f[0]));
    int32x4_t m1 = vmull_s16(vget_low_s16(s1), vget_low_s16(f[1]));
    m1           = vmlal_s16(m1, vget_high_s16(s1), vget_high_s16(f[1]));
    int32x4_t m2 = vmull_s16(vget_low_s16(s2), vget_low_s16(f[2]));
    m2           = vmlal_s16(m2, vget_high_s16(s2), vget_high_s16(f[2]));
    int32x4_t m3 = vmull_s16(vget_low_s16(s3), vget_low_s16(f[3]));
    m3           = vmlal_s16(m3, vget_high_s16(s3), vget_high_s16(f[3]));
    int32x4_t m4 = vmull_s16(vget_low_s16(s4), vget_low_s16(f[4]));
    m4           = vmlal_s16(m4, vget_high_s16(s4), vget_high_s16(f[4]));
    int32x4_t m5 = vmull_s16(vget_low_s16(s5), vget_low_s16(f[5]));
    m5           = vmlal_s16(m5, vget_high_s16(s5), vget_high_s16(f[5]));
    int32x4_t m6 = vmull_s16(vget_low_s16(s6), vget_low_s16(f[6]));
    m6           = vmlal_s16(m6, vget_high_s16(s6), vget_high_s16(f[6]));
    int32x4_t m7 = vmull_s16(vget_low_s16(s7), vget_low_s16(f[7]));
    m7           = vmlal_s16(m7, vget_high_s16(s7), vget_high_s16(f[7]));

    int32x4_t m0123_pairs[] = {m0, m1, m2, m3};
    int32x4_t m4567_pairs[] = {m4, m5, m6, m7};

    *res_low  = horizontal_add_4d_s32x4(m0123_pairs);
    *res_high = horizontal_add_4d_s32x4(m4567_pairs);
}

void svt_av1_warp_affine_neon_i8mm(const int32_t *mat, const uint8_t *ref, int width, int height, int stride,
                                   uint8_t *pred, int p_col, int p_row, int p_width, int p_height, int p_stride,
                                   int subsampling_x, int subsampling_y, ConvolveParams *conv_params, int16_t alpha,
                                   int16_t beta, int16_t gamma, int16_t delta) {
    const int       w0                    = conv_params->fwd_offset;
    const int       w1                    = conv_params->bck_offset;
    const int       is_compound           = conv_params->is_compound;
    uint16_t *const dst                   = conv_params->dst;
    const int       dst_stride            = conv_params->dst_stride;
    const int       do_average            = conv_params->do_average;
    const int       use_dist_wtd_comp_avg = conv_params->use_dist_wtd_comp_avg;

    assert(IMPLIES(is_compound, dst != NULL));
    assert(IMPLIES(do_average, is_compound));

    for (int i = 0; i < p_height; i += 8) {
        for (int j = 0; j < p_width; j += 8) {
            const int32_t src_x = (p_col + j + 4) << subsampling_x;
            const int32_t src_y = (p_row + i + 4) << subsampling_y;
            const int64_t dst_x = (int64_t)mat[2] * src_x + (int64_t)mat[3] * src_y + (int64_t)mat[0];
            const int64_t dst_y = (int64_t)mat[4] * src_x + (int64_t)mat[5] * src_y + (int64_t)mat[1];

            const int64_t x4 = dst_x >> subsampling_x;
            const int64_t y4 = dst_y >> subsampling_y;

            int16x8_t tmp[15];
            warp_affine_horizontal_neon_i8mm(
                ref, width, height, stride, p_width, p_height, alpha, beta, x4, y4, i, tmp);
            warp_affine_vertical(pred,
                                 p_width,
                                 p_height,
                                 p_stride,
                                 is_compound,
                                 dst,
                                 dst_stride,
                                 do_average,
                                 use_dist_wtd_comp_avg,
                                 gamma,
                                 delta,
                                 y4,
                                 i,
                                 j,
                                 tmp,
                                 w0,
                                 w1);
        }
    }
}
