/**
 * projectM -- Milkdrop-esque visualisation SDK
 * Copyright (C)2003-2004 projectM Team
 *
 * This 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.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * See 'LICENSE.txt' included within this release
 *
 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <iostream>

#include "fatal.h"
#include "Common.hpp"

#include "Expr.hpp"
#include "Eval.hpp"
#include "Param.hpp"
#include "PerPixelEqn.hpp"
#include <map>

#include "wipemalloc.h"
#include <cassert>


/* Evaluates a per pixel equation */
void
PerPixelEqn::evaluate(int mesh_i, int mesh_j)
{
  GenExpr * eqn_ptr = 0;


  eqn_ptr = this->gen_expr;

  float ** param_matrix = (float**)this->param->matrix;

  if (param_matrix == 0) {
    assert(param->engine_val);
    (*(float*)param->engine_val) = eqn_ptr->eval_gen_expr(mesh_i, mesh_j);

  } else {

    assert(!(eqn_ptr == NULL || param_matrix == NULL));

    param_matrix[mesh_i][mesh_j] = eqn_ptr->eval_gen_expr(mesh_i, mesh_j);

    /* Now that this parameter has been referenced with a per
    pixel equation, we let the evaluator know by setting
    this flag */
    /// @bug review and verify this behavior
    param->matrix_flag = true;
    param->flags |= P_FLAG_PER_PIXEL;
  }
}

PerPixelEqn::PerPixelEqn(int _index, Param * _param, GenExpr * _gen_expr):index(_index), param(_param), gen_expr(_gen_expr)
{
  assert(index >= 0);
  assert(param != 0);
  assert(gen_expr != 0);
}


PerPixelEqn::~PerPixelEqn()
{
  if (gen_expr)
  delete (gen_expr);
}