Rewrote star loading and rendering to:
1. significantly improve load speed 2. transition from no stars to stars through eight stages.
This commit is contained in:
curt
parent
5e9a45af0c
commit
9568e79ac5
1 changed files with 99 additions and 89 deletions
188
Astro/stars.cxx
188
Astro/stars.cxx
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@ -43,6 +43,7 @@
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#include <Aircraft/aircraft.h>
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#include <Debug/fg_debug.h>
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#include <Include/fg_constants.h>
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#include <Include/fg_types.h>
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#include <Include/fg_zlib.h>
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#include <Main/options.hxx>
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#include <Main/views.hxx>
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@ -55,14 +56,15 @@
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#define EpochStart (631065600)
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#define DaysSinceEpoch(secs) (((secs)-EpochStart)*(1.0/(24*3600)))
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#define FG_MAX_STARS 3500
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/* Define four structures, each with varying amounts of stars */
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/* static */ GLint stars[FG_STAR_LEVELS];
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static GLint stars[FG_STAR_LEVELS];
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/* Initialize the Star Management Subsystem */
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int fgStarsInit( void ) {
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fgPoint3d starlist[FG_MAX_STARS];
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fgFile fd;
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/* struct CelestialCoord pltPos; */
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char path[256], gzpath[256];
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@ -72,7 +74,7 @@ int fgStarsInit( void ) {
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double min_magnitude[FG_STAR_LEVELS];
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/* double ra_save, decl_save; */
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/* double ra_save1, decl_save1; */
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int i;
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int i, j, starcount, count;
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fgPrintf( FG_ASTRO, FG_INFO, "Initializing stars\n");
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@ -85,6 +87,60 @@ int fgStarsInit( void ) {
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fgPrintf( FG_ASTRO, FG_EXIT, "Big whups in stars.cxx\n");
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}
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fgPrintf( FG_ASTRO, FG_INFO, " Loading stars from %s\n", path);
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// load star data file
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if ( (fd = fgopen(path, "rb")) == NULL ) {
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strcpy(gzpath, path);
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strcat(gzpath, ".gz");
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if ( (fd = fgopen(gzpath, "rb")) == NULL ) {
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// Oops, lets not even try to continue. This is critical.
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fgPrintf( FG_ASTRO, FG_EXIT,
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"Cannot open star file: '%s'\n", path);
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}
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}
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starcount = 0;
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// read in each line of the file
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while ( (fggets(fd, line, 256) != NULL) && (starcount < FG_MAX_STARS) ) {
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front = line;
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// printf(" Read line = %s", front);
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// advance to first non-whitespace character
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while ( (front[0] == ' ') || (front[0] == '\t') ) {
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front++;
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}
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// printf(" Line length (after trimming) = %d\n", strlen(front));
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if ( front[0] == '#' ) {
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// comment
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} else if ( strlen(front) <= 1 ) {
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// blank line
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} else {
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// star data line
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// get name
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end = front;
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while ( end[0] != ',' ) {
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end++;
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}
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end[0] = '\0';
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strcpy(name, front);
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front = end;
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front++;
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sscanf(front, "%lf,%lf,%lf\n",
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&right_ascension, &declination, &magnitude);
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starlist[starcount].x = right_ascension;
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starlist[starcount].y = declination;
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starlist[starcount].z = magnitude;
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starcount++;
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}
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}
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min_magnitude[0] = 4.2;
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min_magnitude[1] = 3.6;
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min_magnitude[2] = 3.0;
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@ -94,102 +150,47 @@ int fgStarsInit( void ) {
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min_magnitude[6] = 0.6;
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min_magnitude[7] = 0.0;
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// build the various star display lists
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for ( i = 0; i < FG_STAR_LEVELS; i++ ) {
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fgPrintf( FG_ASTRO, FG_INFO,
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" Loading stars brighter than %.2f from %2\n",
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min_magnitude[i], path);
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if ( (fd = fgopen(path, "rb")) == NULL ) {
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strcpy(gzpath, path);
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strcat(gzpath, ".gz");
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if ( (fd = fgopen(gzpath, "rb")) == NULL ) {
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// Oops, lets not even try to continue. This is critical.
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fgPrintf( FG_ASTRO, FG_EXIT,
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"Cannot open star file: '%s'\n", path);
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}
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}
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stars[i] = xglGenLists(1);
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xglNewList( stars[i], GL_COMPILE );
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xglBegin( GL_POINTS );
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/* read in each line of the file */
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while ( fggets(fd, line, 256) != NULL ) {
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front = line;
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count = 0;
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/* printf(" Read line = %s", front); */
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for ( j = 0; j < starcount; j++ ) {
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magnitude = starlist[j].z;
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// printf("magnitude = %.2f\n", magnitude);
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/* advance to first non-whitespace character */
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while ( (front[0] == ' ') || (front[0] == '\t') ) {
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front++;
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}
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if ( magnitude < min_magnitude[i] ) {
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right_ascension = starlist[j].x;
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declination = starlist[j].y;
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/* printf(" Line length (after trimming) = %d\n", strlen(front));*/
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count++;
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if ( front[0] == '#' ) {
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/* comment */
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} else if ( strlen(front) <= 1 ) {
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/* blank line */
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} else {
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/* star data line */
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/* get name */
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end = front;
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while ( end[0] != ',' ) {
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end++;
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}
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end[0] = '\0';
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strcpy(name, front);
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front = end;
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front++;
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sscanf(front, "%lf,%lf,%lf\n",
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&right_ascension, &declination, &magnitude);
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/*
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if ( strcmp(name, "Betelgeuse") == 0 ) {
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printf(" *** Marking %s\n", name);
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ra_save = right_ascension;
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decl_save = declination;
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}
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*/
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/*
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if ( strcmp(name, "Alnilam") == 0 ) {
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printf(" *** Marking %s\n", name);
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ra_save1 = right_ascension;
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decl_save1 = declination;
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}
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*/
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if ( magnitude < min_magnitude[i] ) {
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/* scale magnitudes to (0.0 - 1.0) */
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magnitude = (0.0 - magnitude) / 5.0 + 1.0;
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/* scale magnitudes again so they look ok */
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if ( magnitude > 1.0 ) { magnitude = 1.0; }
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if ( magnitude < 0.0 ) { magnitude = 0.0; }
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/* magnitude =
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magnitude * 0.7 + (((FG_STAR_LEVELS - 1) - i) * 0.042);
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*/
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magnitude = magnitude * 0.9 +
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(((FG_STAR_LEVELS - 1) - i) * 0.014);
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/* printf(" Found star: %d %s, %.3f %.3f %.3f\n", count,
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name, right_ascension, declination, magnitude); */
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/* scale magnitudes to (0.0 - 1.0) */
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magnitude = (0.0 - magnitude) / 5.0 + 1.0;
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/* scale magnitudes again so they look ok */
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if ( magnitude > 1.0 ) { magnitude = 1.0; }
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if ( magnitude < 0.0 ) { magnitude = 0.0; }
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/* magnitude =
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magnitude * 0.7 + (((FG_STAR_LEVELS - 1) - i) * 0.042);
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*/
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magnitude = magnitude * 0.9 +
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(((FG_STAR_LEVELS - 1) - i) * 0.014);
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/* printf(" Found star: %d %s, %.3f %.3f %.3f\n", count,
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name, right_ascension, declination, magnitude); */
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xglColor3f( magnitude, magnitude, magnitude );
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/*xglColor3f(0,0,0);*/
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xglVertex3f( 50000.0*cos(right_ascension)*cos(declination),
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50000.0*sin(right_ascension)*cos(declination),
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50000.0*sin(declination) );
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}
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} // valid line
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xglColor3f( magnitude, magnitude, magnitude );
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/*xglColor3f(0,0,0);*/
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xglVertex3f( 50000.0*cos(right_ascension)*cos(declination),
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50000.0*sin(right_ascension)*cos(declination),
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50000.0*sin(declination) );
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}
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} /* while */
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fgclose(fd);
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xglEnd();
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/*
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@ -229,6 +230,10 @@ int fgStarsInit( void ) {
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*/
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xglEndList();
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fgPrintf( FG_ASTRO, FG_INFO,
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" Loading %d stars brighter than %.2f\n",
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count, min_magnitude[i]);
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}
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return 1; // OK, we got here because initialization worked.
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@ -283,10 +288,15 @@ void fgStarsRender( void ) {
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/* $Log$
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/* Revision 1.9 1998/08/06 12:45:20 curt
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/* Modified to bring in stars in 8 increments based on magnitude, not number
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/* of stars.
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/* Revision 1.10 1998/08/10 20:33:09 curt
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/* Rewrote star loading and rendering to:
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/* 1. significantly improve load speed
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/* 2. transition from no stars to stars through eight stages.
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/*
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* Revision 1.9 1998/08/06 12:45:20 curt
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* Modified to bring in stars in 8 increments based on magnitude, not number
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* of stars.
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*
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* Revision 1.8 1998/07/13 21:00:10 curt
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* Wrote access functions for current fgOPTIONS.
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*
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