/*
 *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <assert.h>
#include <stdio.h>

#include "./vpx_config.h"
#include "./vp10_rtcd.h"
#include "vp10/common/common.h"
#include "vp10/common/blockd.h"
#include "vp10/common/idct.h"
#include "vpx_dsp/mips/inv_txfm_dspr2.h"
#include "vpx_dsp/txfm_common.h"
#include "vpx_ports/mem.h"

#if HAVE_DSPR2
void vp10_iht16x16_256_add_dspr2(const int16_t *input, uint8_t *dest,
                                int pitch, int tx_type) {
  int i, j;
  DECLARE_ALIGNED(32, int16_t,  out[16 * 16]);
  int16_t *outptr = out;
  int16_t temp_out[16];
  uint32_t pos = 45;

  /* bit positon for extract from acc */
  __asm__ __volatile__ (
    "wrdsp    %[pos],    1    \n\t"
    :
    : [pos] "r" (pos)
  );

  switch (tx_type) {
    case DCT_DCT:     // DCT in both horizontal and vertical
      idct16_rows_dspr2(input, outptr, 16);
      idct16_cols_add_blk_dspr2(out, dest, pitch);
      break;
    case ADST_DCT:    // ADST in vertical, DCT in horizontal
      idct16_rows_dspr2(input, outptr, 16);

      outptr = out;

      for (i = 0; i < 16; ++i) {
        iadst16_dspr2(outptr, temp_out);

        for (j = 0; j < 16; ++j)
          dest[j * pitch + i] =
                    clip_pixel(ROUND_POWER_OF_TWO(temp_out[j], 6)
                                      + dest[j * pitch + i]);
        outptr += 16;
      }
      break;
    case DCT_ADST:    // DCT in vertical, ADST in horizontal
    {
      int16_t temp_in[16 * 16];

      for (i = 0; i < 16; ++i) {
        /* prefetch row */
        prefetch_load((const uint8_t *)(input + 16));

        iadst16_dspr2(input, outptr);
        input += 16;
        outptr += 16;
      }

      for (i = 0; i < 16; ++i)
        for (j = 0; j < 16; ++j)
            temp_in[j * 16 + i] = out[i * 16 + j];

      idct16_cols_add_blk_dspr2(temp_in, dest, pitch);
    }
    break;
    case ADST_ADST:   // ADST in both directions
    {
      int16_t temp_in[16];

      for (i = 0; i < 16; ++i) {
        /* prefetch row */
        prefetch_load((const uint8_t *)(input + 16));

        iadst16_dspr2(input, outptr);
        input += 16;
        outptr += 16;
      }

      for (i = 0; i < 16; ++i) {
        for (j = 0; j < 16; ++j)
          temp_in[j] = out[j * 16 + i];
        iadst16_dspr2(temp_in, temp_out);
        for (j = 0; j < 16; ++j)
          dest[j * pitch + i] =
                    clip_pixel(ROUND_POWER_OF_TWO(temp_out[j], 6)
                                      + dest[j * pitch + i]);
      }
    }
    break;
    default:
      printf("vp10_short_iht16x16_add_dspr2 : Invalid tx_type\n");
      break;
  }
}
#endif  // #if HAVE_DSPR2