utilities.cpp

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/*
    toxic - A Global Illumination Renderer
    Copyright (C) 2003-2004 Francois Beaune
    Contact: http://toxicengine.sourceforge.net/

    This file is part of toxic.

    toxic 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 2 of the License, or
    (at your option) any later version.

    toxic 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 toxic; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "utilities.h"  // include first

using namespace sheep;
using namespace std;
using namespace toxic;

Real ConversionTables::m_cos_phi[256];
Real ConversionTables::m_sin_phi[256];
Real ConversionTables::m_cos_theta[256];
Real ConversionTables::m_sin_theta[256];
Vector3 ConversionTables::m_direction[256];

// Fill the conversion tables when the program starts up.
static ConversionTables conversion_tables;

ConversionTables::ConversionTables() {
    for(int i = 0; i < 256; ++i) {
        const Real angle = static_cast<Real>(i) / 256.0 * PI;   // in [0, Pi]

        m_cos_phi[i] = cos(2.0 * angle);
        m_sin_phi[i] = sin(2.0 * angle);
        m_cos_theta[i] = cos(angle);
        m_sin_theta[i] = sin(angle);
    }

    for(int p = 0; p < 16; ++p) {
        const Real phi = static_cast<Real>(p) / 8.0 * PI;   // in [0, 2*Pi]

        for(int t = 0; t < 16; ++t) {
            const Real theta = static_cast<Real>(t) / 16.0 * PI;    // in [0, Pi]

            m_direction[p * 16 + t] = SphericalCoordsToVector(phi, theta);
        }
    }
}

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