/*
  mult.c: simple multiplying opcodes

  Copyright (C) 2018 Victor Lazzarini
  This file is part of Csound.

  The Csound Library 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.

  Csound 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 Csound; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  02110-1301 USA
*/

#include <csdl.h>
#include "csound.h"

typedef struct {
  OPDS h;
  MYFLT *out, *in1, *in2;
} MULT;


int mult_scalar(CSOUND *csound, MULT *p) {
  *p->out = *p->in1 * *p->in2;
  return OK;
}

int mult_vector(CSOUND *csound, MULT *p) {
  MYFLT *out = p->out;
  MYFLT *in1 = p->in1;
  MYFLT *in2 = p->in2;
  uint32_t    offset = p->h.insdshead->ksmps_offset;
  uint32_t    early  = p->h.insdshead->ksmps_no_end;
  uint32_t    n, nsmps = CS_KSMPS;

  if (UNLIKELY(offset)) memset(out, '\0', offset*sizeof(MYFLT));
    if (UNLIKELY(early)) {
      nsmps -= early;
      memset(&out[nsmps], '\0', early*sizeof(MYFLT));
    }

  for(n = offset; n < nsmps; n++)
    out[n] = in1[n] * in2[n];

  return OK;
}

/* The mult opcode is overloaded for
   a, k, and i inputs. For these cases, it is
   recommended to append an identifier extension .
   to the name for debugging purposes (not strictly required).
   For the user, the extension is not used and all
   overloads are called "mult"
*/

static OENTRY localops[] =
  {
   {  "mult.aa", sizeof(MULT), 0, 2, "a", "aa",
     NULL, (SUBR) mult_vector },
   { "mult.kk", sizeof(MULT), 0, 2, "k", "kk",
     NULL, (SUBR) mult_scalar },
   { "mult.ii", sizeof(MULT), 0, 1, "i", "ii",
        (SUBR) mult_scalar, NULL }
  };

LINKAGE