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0b2d4d4879
Recommendation is to avoid using the year nomenclature as this information is already encoded in the git repo. Avoids needing to repeatly update. Also updates AUTHORS.txt from current repo with contributor names
149 lines
4.5 KiB
C++
149 lines
4.5 KiB
C++
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2015-2016 Mario Luzeiro <mrluzeiro@ua.pt>
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* Copyright The KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/**
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* @file light.h
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* @brief Declare and implement light sources.
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*/
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#ifndef LIGHT_H
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#define LIGHT_H
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#include "ray.h"
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#include "hitinfo.h"
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/**
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* A base light class to derive to implement other light classes.
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*/
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class LIGHT
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{
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public:
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LIGHT() { m_castShadow = true; }
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virtual ~LIGHT() {}
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/**
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* Get parameters from this light.
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*
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* @param aHitPoint: input hit position
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* @param aOutVectorToLight a vector that points from the hit
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* position in direction to the light
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* @param aOutLightColor the color of this light
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* @param aOutDistance the distance from the point to the light
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*/
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virtual void GetLightParameters( const SFVEC3F& aHitPoint, SFVEC3F& aOutVectorToLight,
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SFVEC3F& aOutLightColor, float& aOutDistance ) const = 0;
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void SetCastShadows( bool aCastShadow ) { m_castShadow = aCastShadow; }
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bool GetCastShadows() const { return m_castShadow; }
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protected:
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bool m_castShadow;
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};
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/**
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* Point light source based on http://ogldev.atspace.co.uk/www/tutorial20/tutorial20.html.
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*/
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class POINT_LIGHT : public LIGHT
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{
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public:
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POINT_LIGHT( const SFVEC3F& aPos, const SFVEC3F& aColor )
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{
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m_position = aPos;
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m_color = aColor;
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m_att_constant = 0.9f;
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m_att_linear = 0.0005f;
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m_att_exp = 0.001f;
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m_castShadow = true;
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}
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// Imported functions from LIGHT
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void GetLightParameters( const SFVEC3F& aHitPoint, SFVEC3F& aOutVectorToLight,
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SFVEC3F& aOutLightColor, float& aOutDistance ) const override
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{
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const SFVEC3F vectorLight = m_position - aHitPoint;
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aOutDistance = glm::length( vectorLight );
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aOutVectorToLight = vectorLight / aOutDistance; // normalize
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const float att = 1.0f / ( m_att_constant +
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m_att_linear * aOutDistance +
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m_att_exp * aOutDistance * aOutDistance );
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if( att <= 0.0f )
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aOutLightColor = SFVEC3F( 0.0f, 0.0f, 0.0f );
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else
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aOutLightColor = m_color * att;
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}
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private:
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SFVEC3F m_position;
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SFVEC3F m_color;
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float m_att_constant;
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float m_att_linear;
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float m_att_exp;
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};
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/**
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* A light source based only on a directional vector.
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*/
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class DIRECTIONAL_LIGHT : public LIGHT
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{
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public:
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DIRECTIONAL_LIGHT( const SFVEC3F& aDir, const SFVEC3F& aColor )
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{
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// Invert light direction and make sure it is normalized
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m_inv_direction = glm::normalize( -aDir );
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m_color = aColor;
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m_castShadow = true; // Set as default to cast shadows
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}
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/**
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* Set directional light orientation.
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*
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* @param aDir is the vector defining the direction of the light source.
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*/
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void SetDirection( const SFVEC3F& aDir ) { m_inv_direction = -aDir; }
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// Imported functions from LIGHT
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void GetLightParameters( const SFVEC3F& /* aHitPoint */, SFVEC3F& aOutVectorToLight,
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SFVEC3F& aOutLightColor, float& aOutDistance ) const override
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{
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aOutVectorToLight = m_inv_direction;
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aOutDistance = std::numeric_limits<float>::infinity();
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aOutLightColor = m_color;
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}
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private:
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SFVEC3F m_inv_direction; ///< opposite direction of the light
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SFVEC3F m_color; ///< light color
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};
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#endif // LIGHT_H
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