Clementine-audio-player-Mac.../3rdparty/libprojectm/MilkdropPresetFactory/Expr.hpp

123 lines
2.6 KiB
C++

/**
* projectM -- Milkdrop-esque visualisation SDK
* Copyright (C)2003-2007 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
*
*/
/**
* $Id$
*
* Expression
*
* $Log$
*/
#ifndef _EXPR_H
#define _EXPR_H
#include "dlldefs.h"
#include "CValue.hpp"
class Param;
#define CONST_STACK_ELEMENT 0
#define EXPR_STACK_ELEMENT 1
#define EVAL_ERROR -1
/* Infix Operator Function */
class InfixOp
{
public:
int type;
int precedence;
InfixOp( int type, int precedence );
};
/** Term */
class Term
{
public:
float constant; /* static variable */
Param *param; /* pointer to a changing variable */
Term() { this->constant = 0; this->param = 0; }
};
/* General Expression Type */
class GenExpr
{
public:
int type;
void * item;
~GenExpr();
GenExpr( int type, void *item );
float eval_gen_expr(int mesh_i, int mesh_j);
static GenExpr *const_to_expr( float val );
static GenExpr *param_to_expr( Param *param );
static GenExpr *prefun_to_expr( float (*func_ptr)(void *), GenExpr **expr_list, int num_args );
};
/* Value expression, contains a term union */
class ValExpr
{
public:
int type;
Term term;
~ValExpr();
ValExpr( int type, Term *term );
float eval_val_expr(int mesh_i, int mesh_j);
};
/* A binary expression tree ordered by operator precedence */
class TreeExpr
{
public:
InfixOp * infix_op; /* null if leaf */
GenExpr * gen_expr;
TreeExpr *left, *right;
~TreeExpr();
TreeExpr( InfixOp *infix_op, GenExpr *gen_expr,
TreeExpr *left, TreeExpr *right );
float eval_tree_expr(int mesh_i, int mesh_j);
};
/* A function expression in prefix form */
class PrefunExpr
{
public:
float (*func_ptr)(void*);
int num_args;
GenExpr **expr_list;
PrefunExpr();
~PrefunExpr();
/* Evaluates functions in prefix form */
float eval_prefun_expr(int mesh_i, int mesh_j);
};
#endif /** _EXPR_H */