110 lines
2.6 KiB
C++
110 lines
2.6 KiB
C++
//
|
|
// light.hxx -- lighting routines
|
|
//
|
|
// Written by Curtis Olson, started April 1998.
|
|
//
|
|
// Copyright (C) 1998 Curtis L. Olson - curt@me.umn.edu
|
|
//
|
|
// This program is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU General Public License as
|
|
// published by the Free Software Foundation; either version 2 of the
|
|
// License, or (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful, but
|
|
// WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
// General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
//
|
|
// $Id$
|
|
|
|
|
|
#ifndef _LIGHT_HXX
|
|
#define _LIGHT_HXX
|
|
|
|
|
|
#ifndef __cplusplus
|
|
# error This library requires C++
|
|
#endif
|
|
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_WINDOWS_H
|
|
# include <windows.h>
|
|
#endif
|
|
|
|
#include <GL/glut.h>
|
|
#include <XGL/xgl.h>
|
|
|
|
#include <Include/fg_types.h>
|
|
|
|
|
|
// Define a structure containing the global lighting parameters
|
|
typedef struct {
|
|
|
|
///////////////////////////////////////////////////////////
|
|
// position of the sun in various forms
|
|
|
|
// in geocentric coordinates
|
|
double sun_lon, sun_gc_lat;
|
|
|
|
// in cartesian coordiantes
|
|
struct fgCartesianPoint fg_sunpos;
|
|
|
|
// (in view coordinates)
|
|
GLfloat sun_vec[4];
|
|
|
|
// inverse (in view coordinates)
|
|
GLfloat sun_vec_inv[4];
|
|
|
|
// the angle between the sun and the local horizontal
|
|
double sun_angle;
|
|
|
|
///////////////////////////////////////////////////////////
|
|
// Derived lighting values
|
|
|
|
// ambient component
|
|
GLfloat scene_ambient[3];
|
|
|
|
// diffuse component
|
|
GLfloat scene_diffuse[3];
|
|
|
|
// fog color
|
|
GLfloat fog_color[4];
|
|
|
|
// clear screen color
|
|
GLfloat sky_color[4];
|
|
} fgLIGHT;
|
|
|
|
|
|
extern fgLIGHT cur_light_params;
|
|
|
|
|
|
// initialize lighting tables
|
|
void fgLightInit( void );
|
|
|
|
|
|
// update lighting parameters based on current sun position
|
|
void fgLightUpdate( void);
|
|
|
|
|
|
#endif // _LIGHT_HXX
|
|
|
|
|
|
// $Log$
|
|
// Revision 1.2 1998/04/24 00:52:31 curt
|
|
// Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
|
|
// Fog color fixes.
|
|
// Separated out lighting calcs into their own file.
|
|
//
|
|
// Revision 1.1 1998/04/22 13:24:06 curt
|
|
// C++ - ifiing the code a bit.
|
|
// Starting to reorginize some of the lighting calcs to use a table lookup.
|
|
//
|
|
//
|