/*****************************************************************************
 * mc-c.c: arm motion compensation
 *****************************************************************************
 * Copyright (C) 2009-2014 x264 project
 *
 * Authors: David Conrad <lessen42@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
 *
 * This program is also available under a commercial proprietary license.
 * For more information, contact us at licensing@x264.com.
 *****************************************************************************/

#include "common/common.h"
#include "mc.h"

void x264_prefetch_ref_arm( uint8_t *, intptr_t, int );
void x264_prefetch_fenc_arm( uint8_t *, intptr_t, uint8_t *, intptr_t, int );

void *x264_memcpy_aligned_neon( void *dst, const void *src, size_t n );
void x264_memzero_aligned_neon( void *dst, size_t n );

void x264_pixel_avg_16x16_neon( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, intptr_t, int );
void x264_pixel_avg_16x8_neon ( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, intptr_t, int );
void x264_pixel_avg_8x16_neon ( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, intptr_t, int );
void x264_pixel_avg_8x8_neon  ( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, intptr_t, int );
void x264_pixel_avg_8x4_neon  ( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, intptr_t, int );
void x264_pixel_avg_4x16_neon ( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, intptr_t, int );
void x264_pixel_avg_4x8_neon  ( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, intptr_t, int );
void x264_pixel_avg_4x4_neon  ( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, intptr_t, int );
void x264_pixel_avg_4x2_neon  ( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, intptr_t, int );

void x264_pixel_avg2_w4_neon ( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, int );
void x264_pixel_avg2_w8_neon ( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, int );
void x264_pixel_avg2_w16_neon( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, int );
void x264_pixel_avg2_w20_neon( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, int );

void x264_plane_copy_deinterleave_neon(  pixel *dstu, intptr_t i_dstu,
                                         pixel *dstv, intptr_t i_dstv,
                                         pixel *src,  intptr_t i_src, int w, int h );
void x264_plane_copy_deinterleave_rgb_neon( pixel *dsta, intptr_t i_dsta,
                                            pixel *dstb, intptr_t i_dstb,
                                            pixel *dstc, intptr_t i_dstc,
                                            pixel *src,  intptr_t i_src, int pw, int w, int h );
void x264_plane_copy_interleave_neon( pixel *dst,  intptr_t i_dst,
                                      pixel *srcu, intptr_t i_srcu,
                                      pixel *srcv, intptr_t i_srcv, int w, int h );

void x264_store_interleave_chroma_neon( pixel *dst, intptr_t i_dst, pixel *srcu, pixel *srcv, int height );
void x264_load_deinterleave_chroma_fdec_neon( pixel *dst, pixel *src, intptr_t i_src, int height );
void x264_load_deinterleave_chroma_fenc_neon( pixel *dst, pixel *src, intptr_t i_src, int height );

#define MC_WEIGHT(func)\
void x264_mc_weight_w20##func##_neon( uint8_t *, intptr_t, uint8_t *, intptr_t, const x264_weight_t *, int );\
void x264_mc_weight_w16##func##_neon( uint8_t *, intptr_t, uint8_t *, intptr_t, const x264_weight_t *, int );\
void x264_mc_weight_w8##func##_neon ( uint8_t *, intptr_t, uint8_t *, intptr_t, const x264_weight_t *, int );\
void x264_mc_weight_w4##func##_neon ( uint8_t *, intptr_t, uint8_t *, intptr_t, const x264_weight_t *, int );\
\
static weight_fn_t x264_mc##func##_wtab_neon[6] =\
{\
    x264_mc_weight_w4##func##_neon,\
    x264_mc_weight_w4##func##_neon,\
    x264_mc_weight_w8##func##_neon,\
    x264_mc_weight_w16##func##_neon,\
    x264_mc_weight_w16##func##_neon,\
    x264_mc_weight_w20##func##_neon,\
};

MC_WEIGHT()
MC_WEIGHT(_nodenom)
MC_WEIGHT(_offsetadd)
MC_WEIGHT(_offsetsub)

void x264_mc_copy_w4_neon ( uint8_t *, intptr_t, uint8_t *, intptr_t, int );
void x264_mc_copy_w8_neon ( uint8_t *, intptr_t, uint8_t *, intptr_t, int );
void x264_mc_copy_w16_neon( uint8_t *, intptr_t, uint8_t *, intptr_t, int );
void x264_mc_copy_w16_aligned_neon( uint8_t *, intptr_t, uint8_t *, intptr_t, int );

void x264_mc_chroma_neon( uint8_t *, uint8_t *, intptr_t, uint8_t *, intptr_t, int, int, int, int );
void x264_frame_init_lowres_core_neon( uint8_t *, uint8_t *, uint8_t *, uint8_t *, uint8_t *, intptr_t, intptr_t, int, int );

void x264_hpel_filter_v_neon( uint8_t *, uint8_t *, int16_t *, intptr_t, int );
void x264_hpel_filter_c_neon( uint8_t *, int16_t *, int );
void x264_hpel_filter_h_neon( uint8_t *, uint8_t *, int );

#if !HIGH_BIT_DEPTH
static void x264_weight_cache_neon( x264_t *h, x264_weight_t *w )
{
    if( w->i_scale == 1<<w->i_denom )
    {
        if( w->i_offset < 0 )
        {
            w->weightfn = x264_mc_offsetsub_wtab_neon;
            w->cachea[0] = -w->i_offset;
        }
        else
        {
            w->weightfn = x264_mc_offsetadd_wtab_neon;
            w->cachea[0] = w->i_offset;
        }
    }
    else if( !w->i_denom )
        w->weightfn = x264_mc_nodenom_wtab_neon;
    else
        w->weightfn = x264_mc_wtab_neon;
}

static void (* const x264_pixel_avg_wtab_neon[6])( uint8_t *, intptr_t, uint8_t *, intptr_t, uint8_t *, int ) =
{
    NULL,
    x264_pixel_avg2_w4_neon,
    x264_pixel_avg2_w8_neon,
    x264_pixel_avg2_w16_neon,   // no slower than w12, so no point in a separate function
    x264_pixel_avg2_w16_neon,
    x264_pixel_avg2_w20_neon,
};

static void (* const x264_mc_copy_wtab_neon[5])( uint8_t *, intptr_t, uint8_t *, intptr_t, int ) =
{
    NULL,
    x264_mc_copy_w4_neon,
    x264_mc_copy_w8_neon,
    NULL,
    x264_mc_copy_w16_neon,
};

static const uint8_t hpel_ref0[16] = {0,1,1,1,0,1,1,1,2,3,3,3,0,1,1,1};
static const uint8_t hpel_ref1[16] = {0,0,0,0,2,2,3,2,2,2,3,2,2,2,3,2};

static void mc_luma_neon( uint8_t *dst,    intptr_t i_dst_stride,
                          uint8_t *src[4], intptr_t i_src_stride,
                          int mvx, int mvy,
                          int i_width, int i_height, const x264_weight_t *weight )
{
    int qpel_idx = ((mvy&3)<<2) + (mvx&3);
    intptr_t offset = (mvy>>2)*i_src_stride + (mvx>>2);
    uint8_t *src1 = src[hpel_ref0[qpel_idx]] + offset;
    if ( (mvy&3) == 3 )             // explict if() to force conditional add
        src1 += i_src_stride;

    if( qpel_idx & 5 ) /* qpel interpolation needed */
    {
        uint8_t *src2 = src[hpel_ref1[qpel_idx]] + offset + ((mvx&3) == 3);
        x264_pixel_avg_wtab_neon[i_width>>2](
                dst, i_dst_stride, src1, i_src_stride,
                src2, i_height );
        if( weight->weightfn )
            weight->weightfn[i_width>>2]( dst, i_dst_stride, dst, i_dst_stride, weight, i_height );
    }
    else if( weight->weightfn )
        weight->weightfn[i_width>>2]( dst, i_dst_stride, src1, i_src_stride, weight, i_height );
    else
        x264_mc_copy_wtab_neon[i_width>>2]( dst, i_dst_stride, src1, i_src_stride, i_height );
}

static uint8_t *get_ref_neon( uint8_t *dst,   intptr_t *i_dst_stride,
                              uint8_t *src[4], intptr_t i_src_stride,
                              int mvx, int mvy,
                              int i_width, int i_height, const x264_weight_t *weight )
{
    int qpel_idx = ((mvy&3)<<2) + (mvx&3);
    intptr_t offset = (mvy>>2)*i_src_stride + (mvx>>2);
    uint8_t *src1 = src[hpel_ref0[qpel_idx]] + offset;
    if ( (mvy&3) == 3 )             // explict if() to force conditional add
        src1 += i_src_stride;

    if( qpel_idx & 5 ) /* qpel interpolation needed */
    {
        uint8_t *src2 = src[hpel_ref1[qpel_idx]] + offset + ((mvx&3) == 3);
        x264_pixel_avg_wtab_neon[i_width>>2](
                dst, *i_dst_stride, src1, i_src_stride,
                src2, i_height );
        if( weight->weightfn )
            weight->weightfn[i_width>>2]( dst, *i_dst_stride, dst, *i_dst_stride, weight, i_height );
        return dst;
    }
    else if( weight->weightfn )
    {
        weight->weightfn[i_width>>2]( dst, *i_dst_stride, src1, i_src_stride, weight, i_height );
        return dst;
    }
    else
    {
        *i_dst_stride = i_src_stride;
        return src1;
    }
}

static void hpel_filter_neon( uint8_t *dsth, uint8_t *dstv, uint8_t *dstc, uint8_t *src,
                              intptr_t stride, int width, int height, int16_t *buf )
{
    intptr_t realign = (intptr_t)src & 15;
    src -= realign;
    dstv -= realign;
    dstc -= realign;
    dsth -= realign;
    width += realign;
    while( height-- )
    {
        x264_hpel_filter_v_neon( dstv, src, buf+8, stride, width );
        x264_hpel_filter_c_neon( dstc, buf+8, width );
        x264_hpel_filter_h_neon( dsth, src, width );
        dsth += stride;
        dstv += stride;
        dstc += stride;
        src  += stride;
    }
}
#endif // !HIGH_BIT_DEPTH

void x264_mc_init_arm( int cpu, x264_mc_functions_t *pf )
{
    if( !(cpu&X264_CPU_ARMV6) )
        return;

#if !HIGH_BIT_DEPTH
    pf->prefetch_fenc_420 = x264_prefetch_fenc_arm;
    pf->prefetch_fenc_422 = x264_prefetch_fenc_arm; /* FIXME */
    pf->prefetch_ref  = x264_prefetch_ref_arm;
#endif // !HIGH_BIT_DEPTH

    if( !(cpu&X264_CPU_NEON) )
        return;

#if !HIGH_BIT_DEPTH
    pf->copy_16x16_unaligned = x264_mc_copy_w16_neon;
    pf->copy[PIXEL_16x16] = x264_mc_copy_w16_aligned_neon;
    pf->copy[PIXEL_8x8]   = x264_mc_copy_w8_neon;
    pf->copy[PIXEL_4x4]   = x264_mc_copy_w4_neon;

    pf->plane_copy_deinterleave = x264_plane_copy_deinterleave_neon;
    pf->plane_copy_deinterleave_rgb = x264_plane_copy_deinterleave_rgb_neon;
    pf->plane_copy_interleave = x264_plane_copy_interleave_neon;

    pf->store_interleave_chroma = x264_store_interleave_chroma_neon;
    pf->load_deinterleave_chroma_fdec = x264_load_deinterleave_chroma_fdec_neon;
    pf->load_deinterleave_chroma_fenc = x264_load_deinterleave_chroma_fenc_neon;

    pf->avg[PIXEL_16x16] = x264_pixel_avg_16x16_neon;
    pf->avg[PIXEL_16x8]  = x264_pixel_avg_16x8_neon;
    pf->avg[PIXEL_8x16]  = x264_pixel_avg_8x16_neon;
    pf->avg[PIXEL_8x8]   = x264_pixel_avg_8x8_neon;
    pf->avg[PIXEL_8x4]   = x264_pixel_avg_8x4_neon;
    pf->avg[PIXEL_4x16]  = x264_pixel_avg_4x16_neon;
    pf->avg[PIXEL_4x8]   = x264_pixel_avg_4x8_neon;
    pf->avg[PIXEL_4x4]   = x264_pixel_avg_4x4_neon;
    pf->avg[PIXEL_4x2]   = x264_pixel_avg_4x2_neon;

    pf->weight    = x264_mc_wtab_neon;
    pf->offsetadd = x264_mc_offsetadd_wtab_neon;
    pf->offsetsub = x264_mc_offsetsub_wtab_neon;
    pf->weight_cache = x264_weight_cache_neon;

    pf->mc_chroma = x264_mc_chroma_neon;
    pf->mc_luma = mc_luma_neon;
    pf->get_ref = get_ref_neon;
    pf->hpel_filter = hpel_filter_neon;
    pf->frame_init_lowres_core = x264_frame_init_lowres_core_neon;
#endif // !HIGH_BIT_DEPTH

// Apple's gcc stupidly cannot align stack variables, and ALIGNED_ARRAY can't work on structs
#ifndef SYS_MACOSX
    pf->memcpy_aligned  = x264_memcpy_aligned_neon;
#endif
    pf->memzero_aligned = x264_memzero_aligned_neon;
}
