/*
 * Copyright (c) 2018, 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 <tmmintrin.h>

#include "definitions.h"
#include "common_dsp_rtcd.h"
#include "filter.h"

static INLINE __m128i comp_avg(const __m128i* const data_ref_0, const __m128i* const res_unsigned,
                               const __m128i* const wt, const int use_jnt_avg) {
    __m128i res;
    if (use_jnt_avg) {
        const __m128i data_lo = _mm_unpacklo_epi16(*data_ref_0, *res_unsigned);
        const __m128i data_hi = _mm_unpackhi_epi16(*data_ref_0, *res_unsigned);

        const __m128i wt_res_lo = _mm_madd_epi16(data_lo, *wt);
        const __m128i wt_res_hi = _mm_madd_epi16(data_hi, *wt);

        const __m128i res_lo = _mm_srai_epi32(wt_res_lo, DIST_PRECISION_BITS);
        const __m128i res_hi = _mm_srai_epi32(wt_res_hi, DIST_PRECISION_BITS);

        res = _mm_packs_epi32(res_lo, res_hi);
    } else {
        const __m128i wt_res = _mm_add_epi16(*data_ref_0, *res_unsigned);
        res                  = _mm_srai_epi16(wt_res, 1);
    }
    return res;
}

static INLINE __m128i convolve_rounding(const __m128i* const res_unsigned, const __m128i* const offset_const,
                                        const __m128i* const round_const, const int round_shift) {
    const __m128i res_signed = _mm_sub_epi16(*res_unsigned, *offset_const);
    const __m128i res_round  = _mm_srai_epi16(_mm_add_epi16(res_signed, *round_const), round_shift);
    return res_round;
}

void svt_av1_jnt_convolve_2d_ssse3(const uint8_t* src, int32_t src_stride, uint8_t* dst8, int32_t dst8_stride,
                                   int32_t w, int32_t h, const InterpFilterParams* filter_params_x,
                                   const InterpFilterParams* filter_params_y, const int32_t subpel_x_q4,
                                   const int32_t subpel_y_q4, ConvolveParams* conv_params) {
    //TODO: Write sse code when w<=4
    if (w <= 4) {
        svt_av1_jnt_convolve_2d_c(src,
                                  src_stride,
                                  dst8,
                                  dst8_stride,
                                  w,
                                  h,
                                  filter_params_x,
                                  filter_params_y,
                                  subpel_x_q4,
                                  subpel_y_q4,
                                  conv_params);
        return;
    }

    CONV_BUF_TYPE* dst        = conv_params->dst;
    int            dst_stride = conv_params->dst_stride;
    const int      bd         = 8;

    DECLARE_ALIGNED(16, int16_t, im_block[(MAX_SB_SIZE + MAX_FILTER_TAP - 1) * MAX_SB_SIZE]);
    int                  im_h      = h + filter_params_y->taps - 1;
    int                  im_stride = MAX_SB_SIZE;
    int                  i, j;
    const int            fo_vert          = filter_params_y->taps / 2 - 1;
    const int            fo_horiz         = filter_params_x->taps / 2 - 1;
    const int            do_average       = conv_params->do_average;
    const int            use_jnt_comp_avg = conv_params->use_jnt_comp_avg;
    const uint8_t* const src_ptr          = src - fo_vert * src_stride - fo_horiz;

    const __m128i zero = _mm_setzero_si128();

    const int     w0  = conv_params->fwd_offset;
    const int     w1  = conv_params->bck_offset;
    const __m128i wt0 = _mm_set1_epi16(w0);
    const __m128i wt1 = _mm_set1_epi16(w1);
    const __m128i wt  = _mm_unpacklo_epi16(wt0, wt1);

    const int     offset_0       = bd + 2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;
    const int     offset         = (1 << offset_0) + (1 << (offset_0 - 1));
    const __m128i offset_const   = _mm_set1_epi16(offset);
    const int     rounding_shift = 2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;
    const __m128i rounding_const = _mm_set1_epi16((1 << rounding_shift) >> 1);

    /* Horizontal filter */
    {
        const int16_t* x_filter = av1_get_interp_filter_subpel_kernel(*filter_params_x, subpel_x_q4 & SUBPEL_MASK);
        const __m128i  coeffs_x = _mm_loadu_si128((__m128i*)x_filter);

        // coeffs 0 1 0 1 2 3 2 3
        const __m128i tmp_0 = _mm_unpacklo_epi32(coeffs_x, coeffs_x);
        // coeffs 4 5 4 5 6 7 6 7
        const __m128i tmp_1 = _mm_unpackhi_epi32(coeffs_x, coeffs_x);

        // coeffs 0 1 0 1 0 1 0 1
        const __m128i coeff_01 = _mm_unpacklo_epi64(tmp_0, tmp_0);
        // coeffs 2 3 2 3 2 3 2 3
        const __m128i coeff_23 = _mm_unpackhi_epi64(tmp_0, tmp_0);
        // coeffs 4 5 4 5 4 5 4 5
        const __m128i coeff_45 = _mm_unpacklo_epi64(tmp_1, tmp_1);
        // coeffs 6 7 6 7 6 7 6 7
        const __m128i coeff_67 = _mm_unpackhi_epi64(tmp_1, tmp_1);

        const __m128i round_const = _mm_set1_epi32(((1 << conv_params->round_0) >> 1) + (1 << (bd + FILTER_BITS - 1)));
        const __m128i round_shift = _mm_cvtsi32_si128(conv_params->round_0);

        for (i = 0; i < im_h; ++i) {
            for (j = 0; j < w; j += 8) {
                const __m128i data = _mm_loadu_si128((__m128i*)&src_ptr[i * src_stride + j]);

                const __m128i src_lo = _mm_unpacklo_epi8(data, zero);
                const __m128i src_hi = _mm_unpackhi_epi8(data, zero);

                // Filter even-index pixels
                const __m128i res_0 = _mm_madd_epi16(src_lo, coeff_01);
                const __m128i src_2 = _mm_alignr_epi8(src_hi, src_lo, 4);
                const __m128i res_2 = _mm_madd_epi16(src_2, coeff_23);
                const __m128i src_4 = _mm_alignr_epi8(src_hi, src_lo, 8);
                const __m128i res_4 = _mm_madd_epi16(src_4, coeff_45);
                const __m128i src_6 = _mm_alignr_epi8(src_hi, src_lo, 12);
                const __m128i res_6 = _mm_madd_epi16(src_6, coeff_67);

                __m128i res_even = _mm_add_epi32(_mm_add_epi32(res_0, res_4), _mm_add_epi32(res_2, res_6));
                res_even         = _mm_sra_epi32(_mm_add_epi32(res_even, round_const), round_shift);

                // Filter odd-index pixels
                const __m128i src_1 = _mm_alignr_epi8(src_hi, src_lo, 2);
                const __m128i res_1 = _mm_madd_epi16(src_1, coeff_01);
                const __m128i src_3 = _mm_alignr_epi8(src_hi, src_lo, 6);
                const __m128i res_3 = _mm_madd_epi16(src_3, coeff_23);
                const __m128i src_5 = _mm_alignr_epi8(src_hi, src_lo, 10);
                const __m128i res_5 = _mm_madd_epi16(src_5, coeff_45);
                const __m128i src_7 = _mm_alignr_epi8(src_hi, src_lo, 14);
                const __m128i res_7 = _mm_madd_epi16(src_7, coeff_67);

                __m128i res_odd = _mm_add_epi32(_mm_add_epi32(res_1, res_5), _mm_add_epi32(res_3, res_7));
                res_odd         = _mm_sra_epi32(_mm_add_epi32(res_odd, round_const), round_shift);

                // Pack in the column order 0, 2, 4, 6, 1, 3, 5, 7
                __m128i res = _mm_packs_epi32(res_even, res_odd);
                _mm_storeu_si128((__m128i*)&im_block[i * im_stride + j], res);
            }
        }
    }

    /* Vertical filter */
    {
        const int16_t* y_filter = av1_get_interp_filter_subpel_kernel(*filter_params_y, subpel_y_q4 & SUBPEL_MASK);
        const __m128i  coeffs_y = _mm_loadu_si128((__m128i*)y_filter);

        // coeffs 0 1 0 1 2 3 2 3
        const __m128i tmp_0 = _mm_unpacklo_epi32(coeffs_y, coeffs_y);
        // coeffs 4 5 4 5 6 7 6 7
        const __m128i tmp_1 = _mm_unpackhi_epi32(coeffs_y, coeffs_y);

        // coeffs 0 1 0 1 0 1 0 1
        const __m128i coeff_01 = _mm_unpacklo_epi64(tmp_0, tmp_0);
        // coeffs 2 3 2 3 2 3 2 3
        const __m128i coeff_23 = _mm_unpackhi_epi64(tmp_0, tmp_0);
        // coeffs 4 5 4 5 4 5 4 5
        const __m128i coeff_45 = _mm_unpacklo_epi64(tmp_1, tmp_1);
        // coeffs 6 7 6 7 6 7 6 7
        const __m128i coeff_67 = _mm_unpackhi_epi64(tmp_1, tmp_1);

        const __m128i round_const = _mm_set1_epi32(((1 << conv_params->round_1) >> 1) -
                                                   (1 << (bd + 2 * FILTER_BITS - conv_params->round_0 - 1)));
        const __m128i round_shift = _mm_cvtsi32_si128(conv_params->round_1);

        for (i = 0; i < h; ++i) {
            for (j = 0; j < w; j += 8) {
                // Filter even-index pixels
                const int16_t* data  = &im_block[i * im_stride + j];
                const __m128i  src_0 = _mm_unpacklo_epi16(*(__m128i*)(data + 0 * im_stride),
                                                         *(__m128i*)(data + 1 * im_stride));
                const __m128i  src_2 = _mm_unpacklo_epi16(*(__m128i*)(data + 2 * im_stride),
                                                         *(__m128i*)(data + 3 * im_stride));
                const __m128i  src_4 = _mm_unpacklo_epi16(*(__m128i*)(data + 4 * im_stride),
                                                         *(__m128i*)(data + 5 * im_stride));
                const __m128i  src_6 = _mm_unpacklo_epi16(*(__m128i*)(data + 6 * im_stride),
                                                         *(__m128i*)(data + 7 * im_stride));

                const __m128i res_0 = _mm_madd_epi16(src_0, coeff_01);
                const __m128i res_2 = _mm_madd_epi16(src_2, coeff_23);
                const __m128i res_4 = _mm_madd_epi16(src_4, coeff_45);
                const __m128i res_6 = _mm_madd_epi16(src_6, coeff_67);

                const __m128i res_even = _mm_add_epi32(_mm_add_epi32(res_0, res_2), _mm_add_epi32(res_4, res_6));

                // Filter odd-index pixels
                const __m128i src_1 = _mm_unpackhi_epi16(*(__m128i*)(data + 0 * im_stride),
                                                         *(__m128i*)(data + 1 * im_stride));
                const __m128i src_3 = _mm_unpackhi_epi16(*(__m128i*)(data + 2 * im_stride),
                                                         *(__m128i*)(data + 3 * im_stride));
                const __m128i src_5 = _mm_unpackhi_epi16(*(__m128i*)(data + 4 * im_stride),
                                                         *(__m128i*)(data + 5 * im_stride));
                const __m128i src_7 = _mm_unpackhi_epi16(*(__m128i*)(data + 6 * im_stride),
                                                         *(__m128i*)(data + 7 * im_stride));

                const __m128i res_1 = _mm_madd_epi16(src_1, coeff_01);
                const __m128i res_3 = _mm_madd_epi16(src_3, coeff_23);
                const __m128i res_5 = _mm_madd_epi16(src_5, coeff_45);
                const __m128i res_7 = _mm_madd_epi16(src_7, coeff_67);

                const __m128i res_odd = _mm_add_epi32(_mm_add_epi32(res_1, res_3), _mm_add_epi32(res_5, res_7));

                // Rearrange pixels back into the order 0 ... 7
                const __m128i res_lo = _mm_unpacklo_epi32(res_even, res_odd);
                const __m128i res_hi = _mm_unpackhi_epi32(res_even, res_odd);

                const __m128i res_lo_round = _mm_sra_epi32(_mm_add_epi32(res_lo, round_const), round_shift);
                const __m128i res_hi_round = _mm_sra_epi32(_mm_add_epi32(res_hi, round_const), round_shift);

                const __m128i res_16b      = _mm_packs_epi32(res_lo_round, res_hi_round);
                const __m128i res_unsigned = _mm_add_epi16(res_16b, offset_const);

                // Accumulate values into the destination buffer
                if (do_average) {
                    const __m128i data_ref_0 = _mm_loadu_si128((__m128i*)(&dst[i * dst_stride + j]));

                    const __m128i comp_avg_res = comp_avg(&data_ref_0, &res_unsigned, &wt, use_jnt_comp_avg);

                    const __m128i round_result = convolve_rounding(
                        &comp_avg_res, &offset_const, &rounding_const, rounding_shift);

                    const __m128i res_8 = _mm_packus_epi16(round_result, round_result);

                    _mm_storel_epi64((__m128i*)(&dst8[i * dst8_stride + j]), res_8);
                } else {
                    _mm_storeu_si128((__m128i*)(&dst[i * dst_stride + j]), res_unsigned);
                }
            }
        }
    }
}
