184 lines
5.4 KiB
C++
184 lines
5.4 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 - 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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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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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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#include <Math/interpolater.hxx>
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#include <Math/point3d.hxx>
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// Define a structure containing the global lighting parameters
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class fgLIGHT {
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// Lighting look up tables (based on sun angle with local horizon)
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fgINTERPTABLE *ambient_tbl;
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fgINTERPTABLE *diffuse_tbl;
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fgINTERPTABLE *sky_tbl;
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public:
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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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Point3D 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 (in radians)
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double 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 the sun.
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double sun_rotation;
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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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// fog color adjusted for sunset effects
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GLfloat adj_fog_color[4];
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// clear screen color
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GLfloat sky_color[4];
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// Constructor
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fgLIGHT( void );
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// initialize lighting tables
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void Init( void );
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// update lighting parameters based on current sun position
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void Update( void);
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// calculate fog color adjusted for sunrise/sunset effects
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void UpdateAdjFog( void );
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// Destructor
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~fgLIGHT( void );
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};
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// Global shared light parameter structure
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extern fgLIGHT cur_light_params;
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#endif // _LIGHT_HXX
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// $Log$
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// Revision 1.8 1998/10/16 00:56:10 curt
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// Converted to Point3D class.
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//
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// Revision 1.7 1998/08/29 13:11:33 curt
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// Bernie Bright writes:
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// I've created some new classes to enable pointers-to-functions and
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// pointers-to-class-methods to be treated like objects. These objects
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// can be registered with fgEVENT_MGR.
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//
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// File "Include/fg_callback.hxx" contains the callback class defns.
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//
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// Modified fgEVENT and fgEVENT_MGR to use the callback classes. Also
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// some minor tweaks to STL usage.
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//
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// Added file "Include/fg_stl_config.h" to deal with STL portability
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// issues. I've added an initial config for egcs (and probably gcc-2.8.x).
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// I don't have access to Visual C++ so I've left that for someone else.
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// This file is influenced by the stl_config.h file delivered with egcs.
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//
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// Added "Include/auto_ptr.hxx" which contains an implementation of the
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// STL auto_ptr class which is not provided in all STL implementations
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// and is needed to use the callback classes.
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//
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// Deleted fgLightUpdate() which was just a wrapper to call
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// fgLIGHT::Update().
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//
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// Modified fg_init.cxx to register two method callbacks in place of the
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// old wrapper functions.
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//
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// Revision 1.6 1998/07/22 21:45:39 curt
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// fg_time.cxx: Removed call to ctime() in a printf() which should be harmless
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// but seems to be triggering a bug.
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// light.cxx: Added code to adjust fog color based on sunrise/sunset effects
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// and view orientation. This is an attempt to match the fog color to the
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// sky color in the center of the screen. You see discrepancies at the
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// edges, but what else can be done?
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// sunpos.cxx: Caculate local direction to sun here. (what compass direction
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// do we need to face to point directly at sun)
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//
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// Revision 1.5 1998/07/08 14:48:39 curt
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// polar3d.h renamed to polar3d.hxx
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//
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// Revision 1.4 1998/05/20 20:54:17 curt
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// Converted fgLIGHT to a C++ class.
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//
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// Revision 1.3 1998/05/02 01:53:18 curt
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// Fine tuning mktime() support because of varying behavior on different
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// platforms.
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//
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// Revision 1.2 1998/04/24 00:52:31 curt
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// Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
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// Fog color fixes.
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// Separated out lighting calcs into their own file.
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//
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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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