math.common.h

/*
    Lightmetrica : A research-oriented renderer

    Copyright (c) 2014 Hisanari Otsu

    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 3 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, see <http://www.gnu.org/licenses/>.
*/

#pragma once
#ifndef LIB_LIGHTMETRICA_MATH_COMMON_H
#define LIB_LIGHTMETRICA_MATH_COMMON_H

#include "common.h"
#include <cmath>

#define LM_MATH_NAMESPACE_BEGIN namespace Math {
#define LM_MATH_NAMESPACE_END }

// Precision mode
#ifdef LM_USE_SINGLE_PRECISION
    #define LM_SINGLE_PRECISION 1
#else
    #define LM_SINGLE_PRECISION 0
#endif
#ifdef LM_USE_DOUBLE_PRECISION
    #define LM_DOUBLE_PRECISION 1
#else
    #define LM_DOUBLE_PRECISION 0
#endif
#ifdef LM_USE_MULTI_PRECISION
    #define LM_MULTI_PRECISION 1
#else
    #define LM_MULTI_PRECISION 0
#endif
#if LM_SINGLE_PRECISION + LM_DOUBLE_PRECISION + LM_MULTI_PRECISION != 1
    #error "Invalid precision mode"
#endif

// Multiprecision support
// Note that the multiprecision support can be enabled irrelevant to 
// the macro LM_MULTI_PRECISION for testing.
#ifdef LM_ENABLE_MULTI_PRECISION
    #include <boost/multiprecision/cpp_dec_float.hpp>
    #ifndef LM_PRECISION_NUM
        // Default precision : 50 decimal digits
        #define LM_PRECISION_NUM 50
    #endif
    LM_NAMESPACE_BEGIN
    LM_MATH_NAMESPACE_BEGIN
        #ifdef LM_ENABLE_MULTI_PRECISION
            typedef boost::multiprecision::number<boost::multiprecision::cpp_dec_float<LM_PRECISION_NUM>> BigFloat;
        #endif
    LM_MATH_NAMESPACE_END
    LM_NAMESPACE_END
#endif

#endif // LIB_LIGHTMETRICA_MATH_COMMON_H