265 lines
8 KiB
C++
265 lines
8 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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#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 GLUT_H
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#include <simgear/compiler.h>
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#ifdef SG_MATH_EXCEPTION_CLASH
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# define exception c_exception
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#endif
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#ifdef SG_HAVE_STD_INCLUDES
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# include <cmath>
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#else
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# include <math.h>
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#endif
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#include <string>
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SG_USING_STD(string);
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#include <simgear/constants.h>
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#include <simgear/debug/logstream.hxx>
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#include <simgear/math/interpolater.hxx>
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#include <simgear/math/polar3d.hxx>
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#include <simgear/misc/sg_path.hxx>
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#include <simgear/sky/sky.hxx>
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#include <Aircraft/aircraft.hxx>
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#include <Main/globals.hxx>
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#include <Main/viewer.hxx>
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#include "light.hxx"
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#include "sunpos.hxx"
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extern SGSky *thesky; // FIXME: from main.cxx
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fgLIGHT cur_light_params;
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// Constructor
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fgLIGHT::fgLIGHT( void ) {
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}
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// initialize lighting tables
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void fgLIGHT::Init( void ) {
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SG_LOG( SG_EVENT, SG_INFO,
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"Initializing Lighting interpolation tables." );
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// build the path name to the ambient lookup table
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SGPath path( globals->get_fg_root() );
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SGPath ambient = path;
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ambient.append( "Lighting/ambient" );
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SGPath diffuse = path;
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diffuse.append( "Lighting/diffuse" );
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SGPath specular = path;
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specular.append( "Lighting/specular" );
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SGPath sky = path;
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sky.append( "Lighting/sky" );
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// initialize ambient table
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ambient_tbl = new SGInterpTable( ambient.str() );
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// initialize diffuse table
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diffuse_tbl = new SGInterpTable( diffuse.str() );
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// initialize diffuse table
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specular_tbl = new SGInterpTable( specular.str() );
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// initialize sky table
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sky_tbl = new SGInterpTable( sky.str() );
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}
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// update lighting parameters based on current sun position
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void fgLIGHT::Update( void ) {
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FGInterface *f;
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// if the 4th field is 0.0, this specifies a direction ...
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GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
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// base sky color
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#if defined (sgi) || defined( macintosh )
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GLfloat base_sky_color[4] = { 0.252, 0.403, 0.657, 1.0 };
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#else // default
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GLfloat base_sky_color[4] = { 0.336, 0.406, 0.574, 1.0 };
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#endif
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GLfloat base_fog_color[4] = { 0.80, 0.83, 1.0, 1.0 };
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double deg, ambient, diffuse, specular, sky_brightness;
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f = current_aircraft.fdm_state;
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SG_LOG( SG_EVENT, SG_INFO, "Updating light parameters." );
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// calculate lighting parameters based on sun's relative angle to
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// local up
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// base fog color
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float *sun_color = thesky->get_sun_color();
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base_fog_color[0] *= (1.25 - sun_color[0]/4.0); // 100% red
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base_fog_color[1] *= (0.48 + sun_color[1]/1.923); // 40% green
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base_fog_color[2] *= sun_color[2]; // 0% blue
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deg = sun_angle * SGD_RADIANS_TO_DEGREES;
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SG_LOG( SG_EVENT, SG_INFO, " Sun angle = " << deg );
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ambient = ambient_tbl->interpolate( deg );
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diffuse = diffuse_tbl->interpolate( deg );
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specular = specular_tbl->interpolate( deg );
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sky_brightness = sky_tbl->interpolate( deg );
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SG_LOG( SG_EVENT, SG_INFO,
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" ambient = " << ambient << " diffuse = " << diffuse
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<< " specular = " << specular << " sky = " << sky_brightness );
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// sky_brightness = 0.15; // used to force a dark sky (when testing)
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// if ( ambient < 0.02 ) { ambient = 0.02; }
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// if ( diffuse < 0.0 ) { diffuse = 0.0; }
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// if ( sky_brightness < 0.1 ) { sky_brightness = 0.1; }
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scene_ambient[0] = white[0] * ambient;
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scene_ambient[1] = white[1] * ambient;
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scene_ambient[2] = white[2] * ambient;
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scene_ambient[3] = 1.0;
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scene_diffuse[0] = white[0] * diffuse;
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scene_diffuse[1] = white[1] * diffuse;
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scene_diffuse[2] = white[2] * diffuse;
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scene_diffuse[3] = 1.0;
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scene_specular[0] = white[0] * specular;
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scene_specular[1] = white[1] * specular;
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scene_specular[2] = white[2] * specular;
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scene_specular[3] = 1.0;
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// set sky color
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sky_color[0] = base_sky_color[0] * sky_brightness;
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sky_color[1] = base_sky_color[1] * sky_brightness;
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sky_color[2] = base_sky_color[2] * sky_brightness;
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sky_color[3] = base_sky_color[3];
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// set fog color
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fog_color[0] = base_fog_color[0] * sky_brightness;
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fog_color[1] = base_fog_color[1] * sky_brightness;
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fog_color[2] = base_fog_color[2] * sky_brightness;
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fog_color[3] = base_fog_color[3];
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}
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// calculate fog color adjusted for sunrise/sunset effects
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void fgLIGHT::UpdateAdjFog( void ) {
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FGInterface *f;
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double sun_angle_deg, rotation, param1[3], param2[3];
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f = current_aircraft.fdm_state;
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SG_LOG( SG_EVENT, SG_DEBUG, "Updating adjusted fog parameters." );
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// set fog color (we'll try to match the sunset color in the
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// direction we are looking
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// Do some sanity checking ...
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if ( sun_rotation < -2.0 * SGD_2PI || sun_rotation > 2.0 * SGD_2PI ) {
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SG_LOG( SG_EVENT, SG_ALERT, "Sun rotation bad = " << sun_rotation );
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exit(-1);
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}
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if ( f->get_Psi() < -2.0 * SGD_2PI || f->get_Psi() > 2.0 * SGD_2PI ) {
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SG_LOG( SG_EVENT, SG_ALERT, "Psi rotation bad = " << f->get_Psi() );
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exit(-1);
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}
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if ( globals->get_current_view()->getHeadingOffset_deg() * SGD_DEGREES_TO_RADIANS < -2.0 * SGD_2PI ||
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globals->get_current_view()->getHeadingOffset_deg() * SGD_DEGREES_TO_RADIANS > 2.0 * SGD_2PI ) {
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SG_LOG( SG_EVENT, SG_ALERT, "current view()->view offset bad = "
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<< globals->get_current_view()->getHeadingOffset_deg() * SGD_DEGREES_TO_RADIANS );
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exit(-1);
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}
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// first determine the difference between our view angle and local
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// direction to the sun
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rotation = -(sun_rotation + SGD_PI)
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- (f->get_Psi() - globals->get_current_view()->getHeadingOffset_deg() * SGD_DEGREES_TO_RADIANS);
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while ( rotation < 0 ) {
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rotation += SGD_2PI;
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}
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while ( rotation > SGD_2PI ) {
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rotation -= SGD_2PI;
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}
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rotation *= SGD_RADIANS_TO_DEGREES;
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// fgPrintf( SG_EVENT, SG_INFO,
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// " View to sun difference in degrees = %.2f\n", rotation);
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// next check if we are in a sunset/sunrise situation
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sun_angle_deg = sun_angle * SGD_RADIANS_TO_DEGREES;
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if ( (sun_angle_deg > 80.0) && (sun_angle_deg < 100.0) ) {
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/* 0.0 - 0.6 */
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param1[0] = (10.0 - fabs(90.0 - sun_angle_deg)) / 20.0;
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param1[1] = (10.0 - fabs(90.0 - sun_angle_deg)) / 40.0;
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param1[2] = (10.0 - fabs(90.0 - sun_angle_deg)) / 30.0;
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// param2[2] = -(10.0 - fabs(90.0 - sun_angle)) / 30.0;
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} else {
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param1[0] = param1[1] = param1[2] = 0.0;
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}
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if ( rotation - 180.0 <= 0.0 ) {
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param2[0] = param1[0] * (180.0 - rotation) / 180.0;
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param2[1] = param1[1] * (180.0 - rotation) / 180.0;
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param2[2] = param1[2] * (180.0 - rotation) / 180.0;
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// printf("param1[0] = %.2f param2[0] = %.2f\n", param1[0], param2[0]);
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} else {
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param2[0] = param1[0] * (rotation - 180.0) / 180.0;
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param2[1] = param1[1] * (rotation - 180.0) / 180.0;
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param2[2] = param1[2] * (rotation - 180.0) / 180.0;
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// printf("param1[0] = %.2f param2[0] = %.2f\n", param1[0], param2[0]);
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}
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adj_fog_color[0] = fog_color[0] + param2[0];
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if ( adj_fog_color[0] > 1.0 ) { adj_fog_color[0] = 1.0; }
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adj_fog_color[1] = fog_color[1] + param2[1];
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if ( adj_fog_color[1] > 1.0 ) { adj_fog_color[1] = 1.0; }
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adj_fog_color[2] = fog_color[2] + param2[2];
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if ( adj_fog_color[2] > 1.0 ) { adj_fog_color[2] = 1.0; }
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adj_fog_color[3] = fog_color[3];
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}
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// Destructor
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fgLIGHT::~fgLIGHT( void ) {
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}
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