33726fc21b
Here's a few changes I made to fg-0.58 this weekend. Included are the following features: - Sun and moon have a halo - The moon has a light vector, moon_angle, etc. etc. so that we can have some moonlight during the night. - Lot's of small changes tweakes, including some stuff Norman Vine sent me earlier.
394 lines
12 KiB
C++
394 lines
12 KiB
C++
/**************************************************************************
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* moon.cxx
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* Written by Durk Talsma. Originally started October 1997, for distribution
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* with the FlightGear project. Version 2 was written in August and
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* September 1998. This code is based upon algorithms and data kindly
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* provided by Mr. Paul Schlyter. (pausch@saaf.se).
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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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* (Log is kept at end of this file)
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**************************************************************************/
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#include <FDM/flight.hxx>
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#include <string.h>
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#include "moon.hxx"
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#include <Debug/logstream.hxx>
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#include <Objects/texload.h>
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#ifdef __BORLANDC__
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# define exception c_exception
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#endif
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#include <math.h>
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/*************************************************************************
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* Moon::Moon(fgTIME *t)
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* Public constructor for class Moon. Initializes the orbital elements and
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* sets up the moon texture.
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* Argument: The current time.
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* the hard coded orbital elements for Moon are passed to
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* CelestialBody::CelestialBody();
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************************************************************************/
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Moon::Moon(fgTIME *t) :
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CelestialBody(125.1228, -0.0529538083,
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5.1454, 0.00000,
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318.0634, 0.1643573223,
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60.266600, 0.000000,
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0.054900, 0.000000,
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115.3654, 13.0649929509, t)
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{
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string tpath, fg_tpath;
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int width, height;
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FG_LOG( FG_GENERAL, FG_INFO, "Initializing Moon Texture");
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#ifdef GL_VERSION_1_1
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xglGenTextures(1, &moon_texid);
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xglBindTexture(GL_TEXTURE_2D, moon_texid);
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#elif GL_EXT_texture_object
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xglGenTexturesEXT(1, &moon_texid);
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xglBindTextureEXT(GL_TEXTURE_2D, moon_texid);
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#else
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# error port me
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#endif
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// load in the texture data
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tpath = current_options.get_fg_root() + "/Textures/" + "moon.rgb";
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if ( (moon_texbuf = read_rgb_texture(tpath.c_str(), &width, &height))
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== NULL )
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{
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// Try compressed
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fg_tpath = tpath + ".gz";
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if ( (moon_texbuf = read_rgb_texture(fg_tpath.c_str(), &width, &height))
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== NULL )
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{
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FG_LOG( FG_GENERAL, FG_ALERT,
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"Error in loading moon texture " << tpath );
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exit(-1);
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}
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}
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glTexImage2D( GL_TEXTURE_2D,
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0,
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GL_RGB,
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256, 256,
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0,
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GL_RGB, GL_UNSIGNED_BYTE,
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moon_texbuf);
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// setup the halo texture
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FG_LOG( FG_GENERAL, FG_INFO, "Initializing Moon Texture");
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#ifdef GL_VERSION_1_1
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xglGenTextures(1, &moon_halotexid);
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xglBindTexture(GL_TEXTURE_2D, moon_halotexid);
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#elif GL_EXT_texture_object
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xglGenTexturesEXT(1, &moon_halotexid);
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xglBindTextureEXT(GL_TEXTURE_2D, moon_halotexid);
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#else
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# error port me
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#endif
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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setHalo();
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glTexImage2D( GL_TEXTURE_2D,
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0,
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GL_RGBA,
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256, 256,
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0,
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GL_RGBA, GL_UNSIGNED_BYTE,
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moon_halotexbuf);
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moonObject = gluNewQuadric();
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}
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Moon::~Moon()
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{
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//delete moonObject;
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delete moon_texbuf;
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delete moon_halotexbuf;
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}
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static int texWidth = 256; /* 64x64 is plenty */
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void Moon::setHalo()
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{
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int texSize;
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//void *textureBuf;
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GLubyte *p;
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int i,j;
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double radius;
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texSize = texWidth*texWidth;
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moon_halotexbuf = new GLubyte[texSize*4];
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if (!moon_halotexbuf)
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return; // Ugly!
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p = moon_halotexbuf;
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radius = (double)(texWidth / 2);
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for (i=0; i < texWidth; i++) {
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for (j=0; j < texWidth; j++) {
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double x, y, d;
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x = fabs((double)(i - (texWidth / 2)));
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y = fabs((double)(j - (texWidth / 2)));
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d = sqrt((x * x) + (y * y));
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if (d < radius)
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{
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double t = 1.0 - (d / radius); // t is 1.0 at center, 0.0 at edge */
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// inverse square looks nice
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*p = (int)((double)0xff * (t * t));
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*(p+1) = (int)((double) 0xff * (t*t));
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*(p+2) = (int)((double) 0xff * (t*t));
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*(p+3) = 0x11;
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}
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else
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{
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*p = 0x00;
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*(p+1) = 0x00;
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*(p+2) = 0x00;
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*(p+3) = 0x11;
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}
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p += 4;
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}
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}
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//gluBuild2DMipmaps(GL_TEXTURE_2D, 1, texWidth, texWidth,
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// GL_LUMINANCE,
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// GL_UNSIGNED_BYTE, textureBuf);
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//free(textureBuf);
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}
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/*****************************************************************************
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* void Moon::updatePosition(fgTIME *t, Star *ourSun)
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* this member function calculates the actual topocentric position (i.e.)
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* the position of the moon as seen from the current position on the surface
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* of the moon.
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****************************************************************************/
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void Moon::updatePosition(fgTIME *t, Star *ourSun)
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{
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double
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eccAnom, ecl, actTime,
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xv, yv, v, r, xh, yh, zh, xg, yg, zg, xe, ye, ze,
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Ls, Lm, D, F, mpar, gclat, rho, HA, g,
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geoRa, geoDec;
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fgAIRCRAFT *air;
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FGInterface *f;
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air = ¤t_aircraft;
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f = air->fdm_state;
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updateOrbElements(t);
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actTime = fgCalcActTime(t);
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// calculate the angle between ecliptic and equatorial coordinate system
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// in Radians
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ecl = ((DEG_TO_RAD * 23.4393) - (DEG_TO_RAD * 3.563E-7) * actTime);
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eccAnom = fgCalcEccAnom(M, e); // Calculate the eccentric anomaly
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xv = a * (cos(eccAnom) - e);
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yv = a * (sqrt(1.0 - e*e) * sin(eccAnom));
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v = atan2(yv, xv); // the moon's true anomaly
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r = sqrt (xv*xv + yv*yv); // and its distance
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// estimate the geocentric rectangular coordinates here
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xh = r * (cos(N) * cos (v+w) - sin (N) * sin(v+w) * cos(i));
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yh = r * (sin(N) * cos (v+w) + cos (N) * sin(v+w) * cos(i));
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zh = r * (sin(v+w) * sin(i));
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// calculate the ecliptic latitude and longitude here
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lonEcl = atan2 (yh, xh);
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latEcl = atan2(zh, sqrt(xh*xh + yh*yh));
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/* Calculate a number of perturbatioin, i.e. disturbances caused by the
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* gravitational infuence of the sun and the other major planets.
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* The largest of these even have a name */
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Ls = ourSun->getM() + ourSun->getw();
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Lm = M + w + N;
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D = Lm - Ls;
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F = Lm - N;
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lonEcl += DEG_TO_RAD * (-1.274 * sin (M - 2*D)
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+0.658 * sin (2*D)
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-0.186 * sin(ourSun->getM())
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-0.059 * sin(2*M - 2*D)
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-0.057 * sin(M - 2*D + ourSun->getM())
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+0.053 * sin(M + 2*D)
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+0.046 * sin(2*D - ourSun->getM())
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+0.041 * sin(M - ourSun->getM())
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-0.035 * sin(D)
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-0.031 * sin(M + ourSun->getM())
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-0.015 * sin(2*F - 2*D)
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+0.011 * sin(M - 4*D)
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);
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latEcl += DEG_TO_RAD * (-0.173 * sin(F-2*D)
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-0.055 * sin(M - F - 2*D)
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-0.046 * sin(M + F - 2*D)
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+0.033 * sin(F + 2*D)
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+0.017 * sin(2*M + F)
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);
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r += (-0.58 * cos(M - 2*D)
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-0.46 * cos(2*D)
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);
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FG_LOG(FG_GENERAL, FG_INFO, "Running moon update");
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xg = r * cos(lonEcl) * cos(latEcl);
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yg = r * sin(lonEcl) * cos(latEcl);
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zg = r * sin(latEcl);
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xe = xg;
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ye = yg * cos(ecl) -zg * sin(ecl);
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ze = yg * sin(ecl) +zg * cos(ecl);
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geoRa = atan2(ye, xe);
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geoDec = atan2(ze, sqrt(xe*xe + ye*ye));
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// Given the moon's geocentric ra and dec, calculate its
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// topocentric ra and dec. i.e. the position as seen from the
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// surface of the earth, instead of the center of the earth
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// First calculate the moon's parrallax, that is, the apparent size of the
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// (equatorial) radius of the earth, as seen from the moon
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mpar = asin ( 1 / r);
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gclat = f->get_Latitude() - 0.003358 *
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sin (2 * DEG_TO_RAD * f->get_Latitude() );
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rho = 0.99883 + 0.00167 * cos(2 * DEG_TO_RAD * f->get_Latitude());
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if (geoRa < 0)
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geoRa += (2*FG_PI);
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HA = t->lst - (3.8197186 * geoRa);
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g = atan (tan(gclat) / cos ((HA / 3.8197186)));
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rightAscension = geoRa - mpar * rho * cos(gclat) * sin(HA) / cos (geoDec);
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declination = geoDec - mpar * rho * sin (gclat) * sin (g - geoDec) / sin(g);
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}
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/************************************************************************
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* void Moon::newImage()
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*
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* This function regenerates a new visual image of the moon, which is added to
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* solarSystem display list.
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*
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* Arguments: Right Ascension and declination
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*
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* return value: none
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**************************************************************************/
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void Moon::newImage()
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{
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fgLIGHT *l = &cur_light_params;
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float moon_angle = l->moon_angle;
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/*double x_2, x_4, x_8, x_10;
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GLfloat ambient;
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GLfloat amb[4];*/
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int moonSize = 750;
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GLfloat moonColor[4] = {0.85, 0.75, 0.35, 1.0};
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GLfloat black[4] = {0.0, 0.0,0.0,1.0};
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GLfloat white[4] = {1.0, 1.0,1.0,1.0};
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if( moon_angle*RAD_TO_DEG < 100 )
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{
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/*
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x_2 = moon_angle * moon_angle;
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x_4 = x_2 * x_2;
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x_8 = x_4 * x_4;
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x_10 = x_8 * x_2;
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ambient = (float)(0.4 * pow (1.1, - x_10 / 30.0));
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if (ambient < 0.3) ambient = 0.3;
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if (ambient > 1.0) ambient = 1.0;
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amb[0] = ((ambient * 6.0) - 1.0); // minimum value = 0.8
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amb[1] = ((ambient * 11.0) - 3.0); // minimum value = 0.3
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amb[2] = ((ambient * 12.0) - 3.6); // minimum value = 0.0
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amb[3] = 1.00;
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if (amb[0] > 1.0) amb[0] = 1.0;
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if (amb[1] > 1.0) amb[1] = 1.0;
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if (amb[2] > 1.0) amb[2] = 1.0;
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xglColor3fv(amb);
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xglColor3f(1.0, 1.0, 1.0); */
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xglPushMatrix();
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{
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//xglRotatef(-90, 0.0, 0.0, 1.0);
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xglRotatef(((RAD_TO_DEG * rightAscension)- 90.0), 0.0, 0.0, 1.0);
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xglRotatef((RAD_TO_DEG * declination), 1.0, 0.0, 0.0);
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FG_LOG( FG_GENERAL, FG_INFO,
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"Ra = (" << (RAD_TO_DEG *rightAscension)
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<< "), Dec= (" << (RAD_TO_DEG *declination) << ")" );
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xglTranslatef(0.0, 58600.0, 0.0);
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glEnable(GL_TEXTURE_2D); // TEXTURE ENABLED
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glEnable(GL_BLEND); // BLEND ENABLED
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glBlendFunc(GL_SRC_ALPHA, GL_ONE);
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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glBindTexture(GL_TEXTURE_2D, moon_halotexid);
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glBegin(GL_QUADS);
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glTexCoord2f(0.0f, 0.0f); glVertex3f(-5000, 0.0, -5000);
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glTexCoord2f(1.0f, 0.0f); glVertex3f( 5000, 0.0, -5000);
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glTexCoord2f(1.0f, 1.0f); glVertex3f( 5000, 0.0, 5000);
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glTexCoord2f(0.0f, 1.0f); glVertex3f(-5000, 0.0, 5000);
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glEnd();
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xglEnable(GL_LIGHTING); // LIGHTING ENABLED
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xglEnable( GL_LIGHT0 );
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// set lighting parameters
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xglLightfv(GL_LIGHT0, GL_AMBIENT, white );
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xglLightfv(GL_LIGHT0, GL_DIFFUSE, white );
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xglEnable( GL_CULL_FACE );
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xglMaterialfv(GL_FRONT, GL_AMBIENT, black);
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xglMaterialfv(GL_FRONT, GL_DIFFUSE, moonColor);
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//glEnable(GL_TEXTURE_2D);
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glBlendFunc(GL_ONE, GL_ONE);
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//glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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glBindTexture(GL_TEXTURE_2D, moon_texid);
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//glDisable(GL_LIGHTING); // LIGHTING DISABLED
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gluQuadricTexture(moonObject, GL_TRUE );
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gluSphere(moonObject, moonSize, 12, 12 );
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glDisable(GL_TEXTURE_2D); // TEXTURE DISABLED
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glDisable(GL_BLEND); // BLEND DISABLED
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}
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xglPopMatrix();
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glDisable(GL_LIGHTING); // LIGHTING DISABLED
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}
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else
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{
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}
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}
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