170 lines
5.1 KiB
C++
170 lines
5.1 KiB
C++
// light.hxx -- lighting routines
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//
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// Written by Curtis Olson, started April 1998.
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//
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// Copyright (C) 1998 Curtis L. Olson - http://www.flightgear.org/~curt
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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 as
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// published by the Free Software Foundation; either version 2 of the
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// 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, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// 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, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#ifndef _LIGHT_HXX
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#define _LIGHT_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <simgear/compiler.h>
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#include <simgear/props/props.hxx>
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#include <simgear/structure/subsystem_mgr.hxx>
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#include <simgear/math/interpolater.hxx>
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// Define a structure containing the global lighting parameters
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class FGLight : public SGSubsystem
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{
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private:
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/*
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* Lighting look up tables (based on sun angle with local horizon)
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*/
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SGInterpTable *_ambient_tbl, *_diffuse_tbl, *_specular_tbl;
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SGInterpTable *_sky_tbl;
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/**
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* position of the sun and moon in various forms
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*/
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// in geocentric coordinates
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double _sun_lon, _sun_lat;
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double _moon_lon, _moon_gc_lat;
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// (in view coordinates)
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SGVec4f _sun_vec, _moon_vec;
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// inverse (in view coordinates)
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SGVec4f _sun_vec_inv, _moon_vec_inv;
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// the angle between the celestial object and the local horizontal
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// (in radians)
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double _sun_angle, _moon_angle;
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double _prev_sun_angle;
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// the rotation around our vertical axis of the sun (relative to
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// due south with positive numbers going in the counter clockwise
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// direction.) This is the direction we'd need to face if we
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// wanted to travel towards celestial object.
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double _sun_rotation, _moon_rotation;
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/**
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* Derived lighting values
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*/
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// ambient, diffuse and specular component
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SGVec4f _scene_ambient;
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SGVec4f _scene_diffuse;
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SGVec4f _scene_specular;
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SGVec4f _scene_chrome;
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// clear sky, fog and cloud color
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SGVec4f _sky_color;
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SGVec4f _fog_color;
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SGVec4f _cloud_color;
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// clear sky and fog color adjusted for sunset effects
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SGVec4f _adj_fog_color;
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SGVec4f _adj_sky_color;
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double _dt_total;
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void update_sky_color ();
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void update_adj_fog_color ();
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// properties for chrome light; not a tie because I want to fire
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// property listeners when the values change.
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SGPropertyNode_ptr _chromeProps[4];
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public:
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FGLight ();
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virtual ~FGLight ();
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virtual void init ();
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virtual void reinit ();
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virtual void bind ();
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virtual void unbind ();
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virtual void update ( double dt );
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// Color related functions
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inline const SGVec4f& scene_ambient () const { return _scene_ambient; }
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inline const SGVec4f& scene_diffuse () const { return _scene_diffuse; }
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inline const SGVec4f& scene_specular () const { return _scene_specular; }
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inline const SGVec4f& scene_chrome () const { return _scene_chrome; }
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inline const SGVec4f& sky_color () const { return _sky_color; }
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inline const SGVec4f& cloud_color () const { return _cloud_color; }
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inline const SGVec4f& adj_fog_color () const { return _adj_fog_color; }
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inline const SGVec4f& adj_sky_color () const { return _adj_sky_color; }
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// Sun related functions
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inline double get_sun_angle () const { return _sun_angle; }
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inline void set_sun_angle (double a) { _sun_angle = a; }
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inline double get_sun_rotation () const { return _sun_rotation; }
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inline void set_sun_rotation (double r) { _sun_rotation = r; }
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inline double get_sun_lon () const { return _sun_lon; }
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inline void set_sun_lon (double l) { _sun_lon = l; }
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inline double get_sun_lat () const { return _sun_lat; }
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inline void set_sun_lat (double l) { _sun_lat = l; }
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inline SGVec4f& sun_vec () { return _sun_vec; }
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inline SGVec4f& sun_vec_inv () { return _sun_vec_inv; }
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// Moon related functions
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inline double get_moon_angle () const { return _moon_angle; }
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inline void set_moon_angle (double a) { _moon_angle = a; }
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inline double get_moon_rotation () const { return _moon_rotation; }
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inline void set_moon_rotation (double r) { _moon_rotation = r; }
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inline double get_moon_lon () const { return _moon_lon; }
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inline void set_moon_lon (double l) { _moon_lon = l; }
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inline double get_moon_gc_lat () const { return _moon_gc_lat; }
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inline void set_moon_gc_lat (double l) { _moon_gc_lat = l; }
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inline const SGVec4f& moon_vec () const { return _moon_vec; }
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inline const SGVec4f& moon_vec_inv () const { return _moon_vec_inv; }
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};
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#endif // _LIGHT_HXX
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