176 lines
5.1 KiB
C++
176 lines
5.1 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.
|
|
//
|
|
// $Id$
|
|
|
|
|
|
#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 <string.h>
|
|
|
|
#include <Debug/fg_debug.h>
|
|
#include <Include/fg_constants.h>
|
|
#include <Include/general.h>
|
|
#include <Main/views.hxx>
|
|
#include <Math/fg_geodesy.h>
|
|
#include <Math/interpolater.hxx>
|
|
#include <Math/mat3.h>
|
|
#include <Math/polar.h>
|
|
|
|
#include "fg_time.hxx"
|
|
#include "light.hxx"
|
|
#include "sunpos.hxx"
|
|
|
|
|
|
fgLIGHT cur_light_params;
|
|
|
|
static fgINTERPTABLE *ambient_tbl;
|
|
static fgINTERPTABLE *diffuse_tbl;
|
|
static fgINTERPTABLE *sky_tbl;
|
|
|
|
|
|
// initialize lighting tables
|
|
void fgLightInit( void ) {
|
|
fgGENERAL *g;
|
|
char path[256];
|
|
|
|
fgPrintf( FG_EVENT, FG_INFO,
|
|
"Initializing Lighting interpolation tables.\n" );
|
|
|
|
g = &general;
|
|
|
|
// build the path name to the ambient lookup table
|
|
path[0] = '\0';
|
|
strcat(path, g->root_dir);
|
|
strcat(path, "/Scenery/");
|
|
strcat(path, "Ambient.table");
|
|
// initialize ambient table
|
|
ambient_tbl = new fgINTERPTABLE(path);
|
|
|
|
// build the path name to the diffuse lookup table
|
|
path[0] = '\0';
|
|
strcat(path, g->root_dir);
|
|
strcat(path, "/Scenery/");
|
|
strcat(path, "Diffuse.table");
|
|
// initialize diffuse table
|
|
diffuse_tbl = new fgINTERPTABLE(path);
|
|
|
|
// build the path name to the sky lookup table
|
|
path[0] = '\0';
|
|
strcat(path, g->root_dir);
|
|
strcat(path, "/Scenery/");
|
|
strcat(path, "Sky.table");
|
|
// initialize sky table
|
|
sky_tbl = new fgINTERPTABLE(path);
|
|
}
|
|
|
|
|
|
// update lighting parameters based on current sun position
|
|
void fgLightUpdate( void ) {
|
|
fgLIGHT *l;
|
|
fgTIME *t;
|
|
fgVIEW *v;
|
|
/* if the 4th field is 0.0, this specifies a direction ... */
|
|
GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
|
|
/* base sky color */
|
|
GLfloat base_sky_color[4] = {0.60, 0.60, 0.90, 1.0};
|
|
/* base fog color */
|
|
GLfloat base_fog_color[4] = {1.00, 1.00, 1.00, 1.0};
|
|
double deg, ambient, diffuse, sky_brightness;
|
|
|
|
l = &cur_light_params;
|
|
t = &cur_time_params;
|
|
v = ¤t_view;
|
|
|
|
fgPrintf( FG_EVENT, FG_INFO, "Updating light parameters.\n" );
|
|
|
|
/* calculate lighting parameters based on sun's relative angle to
|
|
* local up */
|
|
|
|
deg = l->sun_angle * 180.0 / FG_PI;
|
|
fgPrintf( FG_EVENT, FG_INFO, " Sun angle = %.2f.\n", deg );
|
|
|
|
ambient = ambient_tbl->interpolate( deg );
|
|
diffuse = diffuse_tbl->interpolate( deg );
|
|
sky_brightness = sky_tbl->interpolate( deg );
|
|
|
|
fgPrintf( FG_EVENT, FG_INFO,
|
|
" ambient = %.2f diffuse = %.2f sky = %.2f\n",
|
|
ambient, diffuse, sky_brightness );
|
|
|
|
// sky_brightness = 0.15; // used to force a dark sky (when testing)
|
|
|
|
// if ( ambient < 0.02 ) { ambient = 0.02; }
|
|
// if ( diffuse < 0.0 ) { diffuse = 0.0; }
|
|
// if ( sky_brightness < 0.1 ) { sky_brightness = 0.1; }
|
|
|
|
l->scene_ambient[0] = white[0] * ambient;
|
|
l->scene_ambient[1] = white[1] * ambient;
|
|
l->scene_ambient[2] = white[2] * ambient;
|
|
|
|
l->scene_diffuse[0] = white[0] * diffuse;
|
|
l->scene_diffuse[1] = white[1] * diffuse;
|
|
l->scene_diffuse[2] = white[2] * diffuse;
|
|
|
|
/* set fog color */
|
|
// l->fog_color[0] = base_fog_color[0] * (ambient + diffuse);
|
|
// l->fog_color[1] = base_fog_color[1] * (ambient + diffuse);
|
|
// l->fog_color[2] = base_fog_color[2] * (ambient + diffuse);
|
|
// l->fog_color[3] = base_fog_color[3];
|
|
l->fog_color[0] = base_fog_color[0] * sky_brightness;
|
|
l->fog_color[1] = base_fog_color[1] * sky_brightness;
|
|
l->fog_color[2] = base_fog_color[2] * sky_brightness;
|
|
l->fog_color[3] = base_fog_color[3];
|
|
|
|
/* set sky color */
|
|
l->sky_color[0] = base_sky_color[0] * sky_brightness;
|
|
l->sky_color[1] = base_sky_color[1] * sky_brightness;
|
|
l->sky_color[2] = base_sky_color[2] * sky_brightness;
|
|
l->sky_color[3] = base_sky_color[3];
|
|
}
|
|
|
|
|
|
// $Log$
|
|
// Revision 1.4 1998/04/28 01:22:18 curt
|
|
// Type-ified fgTIME and fgVIEW.
|
|
//
|
|
// Revision 1.3 1998/04/26 05:10:04 curt
|
|
// "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
|
|
//
|
|
// Revision 1.2 1998/04/24 00:52:30 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.
|
|
//
|
|
//
|