/*
 * Copyright (c) 2024 Institute of Software Chinese Academy of Sciences (ISCAS).
 *
 * 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
 */

#include "config.h"

#include "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavutil/riscv/cpu.h"
#include "libavcodec/vvc/dsp.h"
#include "libavcodec/vvc/dec.h"
#include "libavcodec/riscv/h26x/h2656dsp.h"

#define bf(fn, bd,  opt) fn##_##bd##_##opt

#define AVG_PROTOTYPES(bd, opt)                                                                      \
void bf(ff_vvc_avg, bd, opt)(uint8_t *dst, ptrdiff_t dst_stride,                                     \
    const int16_t *src0, const int16_t *src1, int width, int height);                                \
void bf(ff_vvc_w_avg, bd, opt)(uint8_t *dst, ptrdiff_t dst_stride,                                   \
    const int16_t *src0, const int16_t *src1, int width, int height,                                 \
    int denom, int w0, int w1, int o);

AVG_PROTOTYPES(8, rvv_128)
AVG_PROTOTYPES(8, rvv_256)

#define DMVR_PROTOTYPES(bd, opt)                                                                    \
void ff_vvc_dmvr_##bd##_##opt(int16_t *dst, const uint8_t *src, ptrdiff_t src_stride,               \
     int height, intptr_t mx, intptr_t my, int width);                                              \
void ff_vvc_dmvr_h_##bd##_##opt(int16_t *dst, const uint8_t *src, ptrdiff_t src_stride,             \
     int height, intptr_t mx, intptr_t my, int width);                                              \
void ff_vvc_dmvr_v_##bd##_##opt(int16_t *dst, const uint8_t *src, ptrdiff_t src_stride,             \
     int height, intptr_t mx, intptr_t my, int width);                                              \
void ff_vvc_dmvr_hv_##bd##_##opt(int16_t *dst, const uint8_t *src, ptrdiff_t src_stride,            \
     int height, intptr_t mx, intptr_t my, int width);                                              \

DMVR_PROTOTYPES(8, rvv_128)
DMVR_PROTOTYPES(8, rvv_256)

#define DMVR_INIT(bd, opt) do {                                    \
    c->inter.dmvr[0][0]   = ff_vvc_dmvr_##bd##_##opt;              \
    c->inter.dmvr[0][1]   = ff_vvc_dmvr_h_##bd##_##opt;            \
    c->inter.dmvr[1][0]   = ff_vvc_dmvr_v_##bd##_##opt;            \
    c->inter.dmvr[1][1]   = ff_vvc_dmvr_hv_##bd##_##opt;           \
} while (0)

int ff_vvc_sad_rvv_128(const int16_t *src0, const int16_t *src1, int dx, int dy, int block_w, int block_h);
int ff_vvc_sad_rvv_256(const int16_t *src0, const int16_t *src1, int dx, int dy, int block_w, int block_h);

#define PUT_PIXELS_PROTOTYPES2(bd, opt)                                          \
void bf(ff_vvc_put_pixels, bd, opt)(int16_t *dst,                                \
    const uint8_t *_src, const ptrdiff_t _src_stride,                            \
    const int height, const int8_t *hf, const int8_t *vf, const int width);

PUT_PIXELS_PROTOTYPES2(8, rvv_128)
PUT_PIXELS_PROTOTYPES2(8, rvv_256)

#define PEL_FUNC(dst, C, idx1, idx2, a)                                           \
    do {                                                                          \
        for (int w = 1; w < 7; w++)                                               \
            c->inter.dst[C][w][idx1][idx2] = a;                                   \
    } while (0)                                                                   \

#define FUNCS(C, opt)                                                             \
        PEL_FUNC(put, C, 0, 0, ff_vvc_put_pixels_8_##opt);                        \

void ff_vvc_dsp_init_riscv(VVCDSPContext *const c, const int bd)
{
#if HAVE_RVV
    const int flags = av_get_cpu_flags();
    int vlenb;

    if (!(flags & AV_CPU_FLAG_RVV_I32) || !(flags & AV_CPU_FLAG_RVB))
        return;

    vlenb = ff_get_rv_vlenb();
    if (vlenb >= 32) {
        switch (bd) {
            case 8:
                c->inter.avg    = ff_vvc_avg_8_rvv_256;
# if (__riscv_xlen == 64)
                c->inter.w_avg    = ff_vvc_w_avg_8_rvv_256;
# endif
                DMVR_INIT(8, rvv_256);
                FUNCS(LUMA, rvv_256);
                FUNCS(CHROMA, rvv_256);
                break;
            case 10:
                c->inter.sad      = ff_vvc_sad_rvv_256;
                break;
        }
    } else if (vlenb >= 16) {
        switch (bd) {
            case 8:
                c->inter.avg    = ff_vvc_avg_8_rvv_128;
# if (__riscv_xlen == 64)
                c->inter.w_avg    = ff_vvc_w_avg_8_rvv_128;
# endif
                DMVR_INIT(8, rvv_128);
                FUNCS(LUMA, rvv_128);
                FUNCS(CHROMA, rvv_128);
                break;
            case 10:
                c->inter.sad      = ff_vvc_sad_rvv_128;
                break;
        }
    }
#endif
}
