ffa2a0feb3
but seems to be triggering a bug. light.cxx: Added code to adjust fog color based on sunrise/sunset effects and view orientation. This is an attempt to match the fog color to the sky color in the center of the screen. You see discrepancies at the edges, but what else can be done? sunpos.cxx: Caculate local direction to sun here. (what compass direction do we need to face to point directly at sun)
158 lines
4.3 KiB
C++
158 lines
4.3 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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// 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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fgPoint3d 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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// wrapper function for updating light parameters via the event scheduler
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void fgLightUpdate ( void );
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#endif // _LIGHT_HXX
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// $Log$
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// Revision 1.6 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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