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flightgear/Astro/sky.cxx
curt 1f49d95eae Tweaked sunset/sunrise colors.
1998-10-20 18:28:30 +00:00

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// sky.cxx -- model sky with an upside down "bowl"
//
// Written by Curtis Olson, started December 1997.
//
// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
//
// 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.
//
// $Id$
// (Log is kept at end of this file)
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef HAVE_WINDOWS_H
# include <windows.h>
#endif
#include <math.h>
#include <GL/glut.h>
#include <XGL/xgl.h>
#include <Aircraft/aircraft.hxx>
#include <Debug/fg_debug.h>
#include <Flight/flight.hxx>
#include <Include/fg_constants.h>
#include <Main/views.hxx>
#include <Math/fg_random.h>
#include <Time/event.hxx>
#include <Time/fg_time.hxx>
#include "sky.hxx"
// in meters of course
#define CENTER_ELEV 25000.0
#define INNER_RADIUS 50000.0
#define INNER_ELEV 20000.0
#define MIDDLE_RADIUS 70000.0
#define MIDDLE_ELEV 8000.0
#define OUTER_RADIUS 80000.0
#define OUTER_ELEV 0.0
#define BOTTOM_RADIUS 50000.0
#define BOTTOM_ELEV -2000.0
static float inner_vertex[12][3];
static float middle_vertex[12][3];
static float outer_vertex[12][3];
static float bottom_vertex[12][3];
static float inner_color[12][4];
static float middle_color[12][4];
static float outer_color[12][4];
// Calculate the sky structure vertices
void fgSkyVerticesInit( void ) {
float theta;
int i;
fgPrintf(FG_ASTRO, FG_INFO, " Generating the sky dome vertices.\n");
for ( i = 0; i < 12; i++ ) {
theta = (i * 30.0) * DEG_TO_RAD;
inner_vertex[i][0] = cos(theta) * INNER_RADIUS;
inner_vertex[i][1] = sin(theta) * INNER_RADIUS;
inner_vertex[i][2] = INNER_ELEV;
// printf(" %.2f %.2f\n", cos(theta) * INNER_RADIUS,
// sin(theta) * INNER_RADIUS);
middle_vertex[i][0] = cos((double)theta) * MIDDLE_RADIUS;
middle_vertex[i][1] = sin((double)theta) * MIDDLE_RADIUS;
middle_vertex[i][2] = MIDDLE_ELEV;
outer_vertex[i][0] = cos((double)theta) * OUTER_RADIUS;
outer_vertex[i][1] = sin((double)theta) * OUTER_RADIUS;
outer_vertex[i][2] = OUTER_ELEV;
bottom_vertex[i][0] = cos((double)theta) * BOTTOM_RADIUS;
bottom_vertex[i][1] = sin((double)theta) * BOTTOM_RADIUS;
bottom_vertex[i][2] = BOTTOM_ELEV;
}
}
// (Re)calculate the sky colors at each vertex
void fgSkyColorsInit( void ) {
fgLIGHT *l;
double sun_angle, diff;
double outer_param[3], outer_amt[3], outer_diff[3];
double middle_param[3], middle_amt[3], middle_diff[3];
int i, j;
l = &cur_light_params;
fgPrintf( FG_ASTRO, FG_INFO,
" Generating the sky colors for each vertex.\n" );
// setup for the possibility of sunset effects
sun_angle = l->sun_angle * RAD_TO_DEG;
// fgPrintf( FG_ASTRO, FG_INFO,
// " Sun angle in degrees = %.2f\n", sun_angle);
if ( (sun_angle > 80.0) && (sun_angle < 100.0) ) {
// 0.0 - 0.4
outer_param[0] = (10.0 - fabs(90.0 - sun_angle)) / 20.0;
outer_param[1] = (10.0 - fabs(90.0 - sun_angle)) / 40.0;
outer_param[2] = -(10.0 - fabs(90.0 - sun_angle)) / 30.0;
// outer_param[2] = 0.0;
middle_param[0] = (10.0 - fabs(90.0 - sun_angle)) / 40.0;
middle_param[1] = (10.0 - fabs(90.0 - sun_angle)) / 80.0;
middle_param[2] = 0.0;
outer_diff[0] = outer_param[0] / 6.0;
outer_diff[1] = outer_param[1] / 6.0;
outer_diff[2] = outer_param[2] / 6.0;
middle_diff[0] = middle_param[0] / 6.0;
middle_diff[1] = middle_param[1] / 6.0;
middle_diff[2] = middle_param[2] / 6.0;
} else {
outer_param[0] = outer_param[1] = outer_param[2] = 0.0;
middle_param[0] = middle_param[1] = middle_param[2] = 0.0;
outer_diff[0] = outer_diff[1] = outer_diff[2] = 0.0;
middle_diff[0] = middle_diff[1] = middle_diff[2] = 0.0;
}
// printf(" outer_red_param = %.2f outer_red_diff = %.2f\n",
// outer_red_param, outer_red_diff);
// calculate transition colors between sky and fog
for ( j = 0; j < 3; j++ ) {
outer_amt[j] = outer_param[j];
middle_amt[j] = middle_param[j];
}
for ( i = 0; i < 6; i++ ) {
for ( j = 0; j < 3; j++ ) {
diff = l->sky_color[j] - l->fog_color[j];
// printf("sky = %.2f fog = %.2f diff = %.2f\n",
// l->sky_color[j], l->fog_color[j], diff);
inner_color[i][j] = l->sky_color[j] - diff * 0.3;
middle_color[i][j] = l->sky_color[j] - diff * 0.9 + middle_amt[j];
outer_color[i][j] = l->fog_color[j] + outer_amt[j];
if ( inner_color[i][j] > 1.00 ) { inner_color[i][j] = 1.00; }
if ( inner_color[i][j] < 0.10 ) { inner_color[i][j] = 0.10; }
if ( middle_color[i][j] > 1.00 ) { middle_color[i][j] = 1.00; }
if ( middle_color[i][j] < 0.10 ) { middle_color[i][j] = 0.10; }
if ( outer_color[i][j] > 1.00 ) { outer_color[i][j] = 1.00; }
if ( outer_color[i][j] < 0.10 ) { outer_color[i][j] = 0.10; }
}
inner_color[i][3] = middle_color[i][3] = outer_color[i][3] =
l->sky_color[3];
for ( j = 0; j < 3; j++ ) {
outer_amt[j] -= outer_diff[j];
middle_amt[j] -= middle_diff[j];
}
/*
printf("inner_color[%d] = %.2f %.2f %.2f %.2f\n", i, inner_color[i][0],
inner_color[i][1], inner_color[i][2], inner_color[i][3]);
printf("middle_color[%d] = %.2f %.2f %.2f %.2f\n", i,
middle_color[i][0], middle_color[i][1], middle_color[i][2],
middle_color[i][3]);
printf("outer_color[%d] = %.2f %.2f %.2f %.2f\n", i,
outer_color[i][0], outer_color[i][1], outer_color[i][2],
outer_color[i][3]);
*/
}
for ( j = 0; j < 3; j++ ) {
outer_amt[j] = 0.0;
middle_amt[j] = 0.0;
}
for ( i = 6; i < 12; i++ ) {
for ( j = 0; j < 3; j++ ) {
diff = l->sky_color[j] - l->fog_color[j];
// printf("sky = %.2f fog = %.2f diff = %.2f\n",
// l->sky_color[j], l->fog_color[j], diff);
inner_color[i][j] = l->sky_color[j] - diff * 0.3;
middle_color[i][j] = l->sky_color[j] - diff * 0.9 + middle_amt[j];
outer_color[i][j] = l->fog_color[j] + outer_amt[j];
if ( inner_color[i][j] > 1.00 ) { inner_color[i][j] = 1.00; }
if ( inner_color[i][j] < 0.10 ) { inner_color[i][j] = 0.10; }
if ( middle_color[i][j] > 1.00 ) { middle_color[i][j] = 1.00; }
if ( middle_color[i][j] < 0.10 ) { middle_color[i][j] = 0.10; }
if ( outer_color[i][j] > 1.00 ) { outer_color[i][j] = 1.00; }
if ( outer_color[i][j] < 0.15 ) { outer_color[i][j] = 0.15; }
}
inner_color[i][3] = middle_color[i][3] = outer_color[i][3] =
l->sky_color[3];
for ( j = 0; j < 3; j++ ) {
outer_amt[j] += outer_diff[j];
middle_amt[j] += middle_diff[j];
}
/*
printf("inner_color[%d] = %.2f %.2f %.2f %.2f\n", i, inner_color[i][0],
inner_color[i][1], inner_color[i][2], inner_color[i][3]);
printf("middle_color[%d] = %.2f %.2f %.2f %.2f\n", i,
middle_color[i][0], middle_color[i][1], middle_color[i][2],
middle_color[i][3]);
printf("outer_color[%d] = %.2f %.2f %.2f %.2f\n", i,
outer_color[i][0], outer_color[i][1], outer_color[i][2],
outer_color[i][3]);
*/
}
}
// Initialize the sky structure and colors
void fgSkyInit( void ) {
fgPrintf(FG_ASTRO, FG_INFO, "Initializing the sky\n");
fgSkyVerticesInit();
// regester fgSkyColorsInit() as an event to be run periodically
global_events.Register( "fgSkyColorsInit()", fgSkyColorsInit,
fgEVENT::FG_EVENT_READY, 30000);
}
// Draw the Sky
void fgSkyRender( void ) {
fgFLIGHT *f;
fgLIGHT *l;
fgVIEW *v;
float inner_color[4];
float middle_color[4];
float outer_color[4];
double diff;
int i;
f = current_aircraft.flight;
l = &cur_light_params;
v = &current_view;
// printf("Rendering the sky.\n");
// calculate the proper colors
for ( i = 0; i < 3; i++ ) {
diff = l->sky_color[i] - l->adj_fog_color[i];
// printf("sky = %.2f fog = %.2f diff = %.2f\n",
// l->sky_color[j], l->adj_fog_color[j], diff);
inner_color[i] = l->sky_color[i] - diff * 0.3;
middle_color[i] = l->sky_color[i] - diff * 0.9;
outer_color[i] = l->adj_fog_color[i];
}
inner_color[3] = middle_color[3] = outer_color[3] = l->adj_fog_color[3];
xglPushMatrix();
// Translate to view position
xglTranslatef( v->cur_zero_elev.x(),
v->cur_zero_elev.y(),
v->cur_zero_elev.z() );
// printf(" Translated to %.2f %.2f %.2f\n",
// v->cur_zero_elev.x, v->cur_zero_elev.y, v->cur_zero_elev.z );
// Rotate to proper orientation
// printf(" lon = %.2f lat = %.2f\n", FG_Longitude * RAD_TO_DEG,
// FG_Latitude * RAD_TO_DEG);
xglRotatef( FG_Longitude * RAD_TO_DEG, 0.0, 0.0, 1.0 );
xglRotatef( 90.0 - FG_Latitude * RAD_TO_DEG, 0.0, 1.0, 0.0 );
xglRotatef( l->sun_rotation * RAD_TO_DEG, 0.0, 0.0, 1.0 );
// Draw inner/center section of sky*/
xglBegin( GL_TRIANGLE_FAN );
xglColor4fv(l->sky_color);
xglVertex3f(0.0, 0.0, CENTER_ELEV);
for ( i = 0; i < 12; i++ ) {
xglColor4fv( inner_color );
xglVertex3fv( inner_vertex[i] );
}
xglColor4fv( inner_color );
xglVertex3fv( inner_vertex[0] );
xglEnd();
// Draw the middle ring
xglBegin( GL_TRIANGLE_STRIP );
for ( i = 0; i < 12; i++ ) {
xglColor4fv( middle_color );
// printf("middle_color[%d] = %.2f %.2f %.2f %.2f\n", i,
// middle_color[i][0], middle_color[i][1], middle_color[i][2],
// middle_color[i][3]);
// xglColor4f(1.0, 0.0, 0.0, 1.0);
xglVertex3fv( middle_vertex[i] );
xglColor4fv( inner_color );
// printf("inner_color[%d] = %.2f %.2f %.2f %.2f\n", i,
// inner_color[i][0], inner_color[i][1], inner_color[i][2],
// inner_color[i][3]);
// xglColor4f(0.0, 0.0, 1.0, 1.0);
xglVertex3fv( inner_vertex[i] );
}
xglColor4fv( middle_color );
// xglColor4f(1.0, 0.0, 0.0, 1.0);
xglVertex3fv( middle_vertex[0] );
xglColor4fv( inner_color );
// xglColor4f(0.0, 0.0, 1.0, 1.0);
xglVertex3fv( inner_vertex[0] );
xglEnd();
// Draw the outer ring
xglBegin( GL_TRIANGLE_STRIP );
for ( i = 0; i < 12; i++ ) {
xglColor4fv( outer_color );
xglVertex3fv( outer_vertex[i] );
xglColor4fv( middle_color );
xglVertex3fv( middle_vertex[i] );
}
xglColor4fv( outer_color );
xglVertex3fv( outer_vertex[0] );
xglColor4fv( middle_color );
xglVertex3fv( middle_vertex[0] );
xglEnd();
// Draw the bottom skirt
xglBegin( GL_TRIANGLE_STRIP );
xglColor4fv( outer_color );
for ( i = 0; i < 12; i++ ) {
xglVertex3fv( bottom_vertex[i] );
xglVertex3fv( outer_vertex[i] );
}
xglVertex3fv( bottom_vertex[0] );
xglVertex3fv( outer_vertex[0] );
xglEnd();
xglPopMatrix();
}
// $Log$
// Revision 1.13 1998/10/20 18:28:30 curt
// Tweaked sunset/sunrise colors.
//
// Revision 1.12 1998/10/16 23:27:18 curt
// C++-ifying.
//
// Revision 1.11 1998/10/16 00:52:19 curt
// Converted to Point3D class.
//
// Revision 1.10 1998/08/29 13:07:16 curt
// Rewrite of event manager thanks to Bernie Bright.
//
// Revision 1.9 1998/08/22 01:18:59 curt
// Minor tweaks to avoid using unitialized memory.
//
// Revision 1.8 1998/08/12 21:40:44 curt
// Sky now tracks adjusted fog color so it blends well with terrain.
//
// Revision 1.7 1998/07/22 21:39:21 curt
// Lower skirt tracks adjusted fog color, not fog color.
//
// Revision 1.6 1998/05/23 14:07:14 curt
// Use new C++ events class.
//
// Revision 1.5 1998/04/28 01:19:02 curt
// Type-ified fgTIME and fgVIEW
//
// Revision 1.4 1998/04/26 05:10:01 curt
// "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
//
// Revision 1.3 1998/04/25 22:06:25 curt
// Edited cvs log messages in source files ... bad bad bad!
//
// Revision 1.2 1998/04/24 00:45:03 curt
// Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
// Fixed a bug when generating sky colors.
//
// Revision 1.1 1998/04/22 13:21:32 curt
// C++ - ifing the code a bit.
//
// Revision 1.9 1998/04/03 21:52:50 curt
// Converting to Gnu autoconf system.
//
// Revision 1.8 1998/03/09 22:47:25 curt
// Incorporated Durk's updates.
//
// Revision 1.7 1998/02/19 13:05:49 curt
// Incorporated some HUD tweaks from Michelle America.
// Tweaked the sky's sunset/rise colors.
// Other misc. tweaks.
//
// Revision 1.6 1998/02/07 15:29:32 curt
// Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
// <chotchkiss@namg.us.anritsu.com>
//
// Revision 1.5 1998/01/27 00:47:48 curt
// Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
// system and commandline/config file processing code.
//
// Revision 1.4 1998/01/26 15:54:28 curt
// Added a "skirt" to try to help hide gaps between scenery and sky. This will
// have to be revisited in the future.
//
// Revision 1.3 1998/01/19 19:26:59 curt
// Merged in make system changes from Bob Kuehne <rpk@sgi.com>
// This should simplify things tremendously.
//
// Revision 1.2 1998/01/19 18:40:17 curt
// Tons of little changes to clean up the code and to remove fatal errors
// when building with the c++ compiler.
//
// Revision 1.1 1998/01/07 03:16:19 curt
// Moved from .../Src/Scenery/ to .../Src/Astro/
//
// Revision 1.11 1997/12/30 22:22:38 curt
// Further integration of event manager.
//
// Revision 1.10 1997/12/30 20:47:53 curt
// Integrated new event manager with subsystem initializations.
//
// Revision 1.9 1997/12/30 13:06:57 curt
// A couple lighting tweaks ...
//
// Revision 1.8 1997/12/23 04:58:38 curt
// Tweaked the sky coloring a bit to build in structures to allow finer rgb
// control.
//
// Revision 1.7 1997/12/22 23:45:48 curt
// First stab at sunset/sunrise sky glow effects.
//
// Revision 1.6 1997/12/22 04:14:34 curt
// Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
//
// Revision 1.5 1997/12/19 23:34:59 curt
// Lot's of tweaking with sky rendering and lighting.
//
// Revision 1.4 1997/12/19 16:45:02 curt
// Working on scene rendering order and options.
//
// Revision 1.3 1997/12/18 23:32:36 curt
// First stab at sky dome actually starting to look reasonable. :-)
//
// Revision 1.2 1997/12/18 04:07:03 curt
// Worked on properly translating and positioning the sky dome.
//
// Revision 1.1 1997/12/17 23:14:30 curt
// Initial revision.
// Begin work on rendering the sky. (Rather than just using a clear screen.)
//
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