103 lines
2.4 KiB
C++
103 lines
2.4 KiB
C++
//
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// 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 - curt@me.umn.edu
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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., 675 Mass Ave, Cambridge, MA 02139, 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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#include <config.h>
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#ifdef HAVE_WINDOWS_H
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# include <windows.h>
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#endif
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#include <GL/glut.h>
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#include <XGL/xgl.h>
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#include <Include/fg_types.h>
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// Define a structure containing the global lighting parameters
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typedef struct {
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///////////////////////////////////////////////////////////
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// position of the sun in various forms
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// in geocentric coordinates
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double sun_lon, sun_gc_lat;
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// in cartesian coordiantes
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struct fgCartesianPoint fg_sunpos;
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// (in view coordinates)
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GLfloat sun_vec[4];
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// inverse (in view coordinates)
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GLfloat sun_vec_inv[4];
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// the angle between the sun and the local horizontal
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double sun_angle;
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///////////////////////////////////////////////////////////
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// Derived lighting values
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// ambient component
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GLfloat scene_ambient[3];
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// diffuse component
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GLfloat scene_diffuse[3];
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// fog color
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GLfloat fog_color[4];
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// clear screen color
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GLfloat sky_color[4];
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} fgLIGHT;
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extern fgLIGHT cur_light_params;
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// initialize lighting tables
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void fgLightInit( void );
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// update lighting parameters based on current sun position
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void fgLightUpdate( void);
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#endif // _LIGHT_HXX
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// $Log$
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// Revision 1.1 1998/04/22 13:24:06 curt
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// C++ - ifiing the code a bit.
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// Starting to reorginize some of the lighting calcs to use a table lookup.
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//
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//
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