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flightgear/Cockpit/hud.c
curt e3e1a04634 Converting to Gnu autoconf system. 
Tweaks to hud.c
1998-04-03 21:55:27 +00:00

1678 lines
49 KiB
C
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/**************************************************************************
* hud.c -- hud defines and prototypes
*
* Written by Michele America, started September 1997.
*
* Copyright (C) 1997 Michele F. America - micheleamerica@geocities.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)
**************************************************************************/
#include <config.h>
#ifdef HAVE_WINDOWS_H
# include <windows.h>
#endif
#include <GL/glut.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_VALUES_H
# include <values.h> // for MAXINT
#endif
#include "hud.h"
#include <Include/fg_constants.h>
#include <Aircraft/aircraft.h>
#include <Main/fg_debug.h>
#include <Math/fg_random.h>
#include <Math/mat3.h>
#include <Math/polar.h>
#include <Scenery/scenery.h>
#include <Time/fg_timer.h>
#include <Weather/weather.h>
// #define DEBUG
#define drawOneLine(x1,y1,x2,y2) glBegin(GL_LINES); \
glVertex2f ((x1),(y1)); glVertex2f ((x2),(y2)); glEnd();
// The following routines obtain information concerntin the aircraft's
// current state and return it to calling instrument display routines.
// They should eventually be member functions of the aircraft.
//
double get_throttleval( void )
{
fgCONTROLS *pcontrols;
pcontrols = current_aircraft.controls;
return pcontrols->throttle[0]; // Hack limiting to one engine
}
double get_aileronval( void )
{
fgCONTROLS *pcontrols;
pcontrols = current_aircraft.controls;
return pcontrols->aileron;
}
double get_elevatorval( void )
{
fgCONTROLS *pcontrols;
pcontrols = current_aircraft.controls;
return pcontrols->elevator;
}
double get_elev_trimval( void )
{
fgCONTROLS *pcontrols;
pcontrols = current_aircraft.controls;
return pcontrols->elevator_trim;
}
double get_rudderval( void )
{
fgCONTROLS *pcontrols;
pcontrols = current_aircraft.controls;
return pcontrols->rudder;
}
double get_speed( void )
{
fgFLIGHT *f;
f = current_aircraft.flight;
return( FG_V_equiv_kts ); // Make an explicit function call.
}
double get_aoa( void )
{
fgFLIGHT *f;
f = current_aircraft.flight;
return( FG_Gamma_vert_rad * RAD_TO_DEG );
}
double get_roll( void )
{
fgFLIGHT *f;
f = current_aircraft.flight;
return( FG_Phi );
}
double get_pitch( void )
{
fgFLIGHT *f;
f = current_aircraft.flight;
return( FG_Theta );
}
double get_heading( void )
{
fgFLIGHT *f;
f = current_aircraft.flight;
return( FG_Psi * RAD_TO_DEG );
}
double get_altitude( void )
{
fgFLIGHT *f;
// double rough_elev;
f = current_aircraft.flight;
// rough_elev = mesh_altitude(FG_Longitude * RAD_TO_ARCSEC,
// FG_Latitude * RAD_TO_ARCSEC);
return( FG_Altitude * FEET_TO_METER /* -rough_elev */ );
}
double get_sideslip( void )
{
fgFLIGHT *f;
f = current_aircraft.flight;
return( FG_Beta );
}
/****************************************************************************/
/* Convert degrees to dd mm.mmm' (DMM-Format) */
/****************************************************************************/
#if 0
char *toDM(double a)
{
short neg = 0;
double d, m;
static char dm[13];
if (a < 0.0) {
a = -a;
neg = 1;
}
d = (double) ( (int) a);
m = (a - d) * 60.0;
if (m > 59.5) {
m = 0.0;
d += 1.0;
}
if (neg) d = -d;
sprintf(dm, "%.0f<EFBFBD>%06.3f'", d, m);
return dm;
}
#endif // 0
double get_latitude( void )
{
fgFLIGHT *f;
f = current_aircraft.flight;
// return( toDM(FG_Latitude * RAD_TO_DEG) );
return((double)((int)( FG_Latitude * RAD_TO_DEG)) );
}
double get_lat_min( void )
{
fgFLIGHT *f;
double a, d;
f = current_aircraft.flight;
a = FG_Latitude * RAD_TO_DEG;
if (a < 0.0) {
a = -a;
}
d = (double) ( (int) a);
return( (a - d) * 60.0);
}
double get_longitude( void )
{
fgFLIGHT *f;
f = current_aircraft.flight;
// return( toDM(FG_Longitude * RAD_TO_DEG) );
return((double)((int) (FG_Longitude * RAD_TO_DEG)) );
}
double get_long_min( void )
{
fgFLIGHT *f;
double a, d;
f = current_aircraft.flight;
a = FG_Longitude * RAD_TO_DEG;
if (a < 0.0) {
a = -a;
}
d = (double) ( (int) a);
return( (a - d) * 60.0);
}
//
// The following code deals with painting the "instrument" on the display
//
/* textString - Bitmap font string */
static void textString(int x, int y, char *msg, void *font)
{
glRasterPos2f(x, y);
while (*msg) {
glutBitmapCharacter(font, *msg);
msg++;
}
}
/* strokeString - Stroke font string */
/*
static void strokeString(int x, int y, char *msg, void *font)
{
glPushMatrix();
glTranslatef(x, y, 0);
glScalef(.04, .04, .04);
while (*msg) {
glutStrokeCharacter(font, *msg);
msg++;
}
glPopMatrix();
}
*/
/*
Draws a measuring scale anywhere on the HUD
Needs: HUD_scale struct
*/
static void drawscale( HUD_scale * pscale )
{
double vmin, vmax;
int marker_x;
int marker_y;
register i;
char TextScale[80];
int condition;
double cur_value = (*(pscale->load_value))();
int disp_val;
vmin = cur_value - pscale->half_width_units; // width units == needle travel
vmax = cur_value + pscale->half_width_units; // or picture unit span.
if( pscale->type == VERTICAL ) // Vertical scale
{
drawOneLine( pscale->scrn_pos.right, // Vertical scale bar
pscale->scrn_pos.bottom,
pscale->scrn_pos.right,
pscale->scrn_pos.top );
if( pscale->orientation == LEFT ) // Calculate x marker offset
marker_x = pscale->scrn_pos.left - 6;
else
if( pscale->orientation == RIGHT )
marker_x = pscale->scrn_pos.right;
// Draw the basic markings for the scale...
if( pscale->orientation == LEFT )
{
drawOneLine( pscale->scrn_pos.right - 3, // Bottom tick bar
pscale->scrn_pos.bottom,
pscale->scrn_pos.right,
pscale->scrn_pos.bottom );
drawOneLine( pscale->scrn_pos.right - 3, // Top tick bar
pscale->scrn_pos.top,
pscale->scrn_pos.right,
pscale->scrn_pos.top );
drawOneLine( pscale->scrn_pos.right, // Middle tick bar /Index
pscale->mid_scr,
pscale->scrn_pos.right + 6,
pscale->mid_scr );
}
else
if( pscale->orientation == RIGHT )
{
drawOneLine( pscale->scrn_pos.right,
pscale->scrn_pos.bottom,
pscale->scrn_pos.right+3,
pscale->scrn_pos.bottom );
drawOneLine( pscale->scrn_pos.right,
pscale->scrn_pos.top,
pscale->scrn_pos.right+3,
pscale->scrn_pos.top );
drawOneLine( pscale->scrn_pos.right,
pscale->mid_scr,
pscale->scrn_pos.right-6,
pscale->mid_scr );
}
// Work through from bottom to top of scale. Calculating where to put
// minor and major ticks.
for( i = (int)(vmin); i <= (int)(vmax); i++ )
{
if( pscale->sub_type == LIMIT ) { // Don't show ticks
condition = (i >= pscale->minimum_value); // below Minimum value.
}
else {
if( pscale->sub_type == NOLIMIT ) {
condition = 1;
}
}
if( condition ) // Show a tick if necessary
{
// Calculate the location of this tick
marker_y = (int)(pscale->scrn_pos.bottom + (i - vmin) * pscale->factor);
// Block calculation artifact from drawing ticks below min coordinate.
// Calculation here accounts for text height.
if( marker_y < (pscale->scrn_pos.bottom + 4)) { // Magic number!!!
continue;
}
if( (i%pscale->div_min) == 0) {
if( pscale->orientation == LEFT )
{
drawOneLine( marker_x + 3, marker_y, marker_x + 6, marker_y );
}
else {
if( pscale->orientation == RIGHT )
{
drawOneLine( marker_x, marker_y, marker_x + 3, marker_y );
}
}
}
if( (i%pscale->div_max) == 0 ) {
drawOneLine( marker_x, marker_y,
marker_x + 6, marker_y );
if(pscale->modulo) {
disp_val = i % pscale->modulo;
if( !disp_val ) {
disp_val = pscale->modulo;
}
if( disp_val < 0) {
disp_val += pscale->modulo;
}
if( disp_val == pscale->modulo ) {
disp_val = 0;
}
}
else {
disp_val = i;
}
sprintf( TextScale, "%d", disp_val );
if( pscale->orientation == LEFT ) {
textString( marker_x - 8 * strlen(TextScale) - 2, marker_y - 4,
TextScale, GLUT_BITMAP_8_BY_13 );
}
else {
if( pscale->orientation == RIGHT ) {
textString( marker_x + 10, marker_y - 4,
TextScale, GLUT_BITMAP_8_BY_13 );
}
}
}
} // End if condition
} // End for range of i from vmin to vmax
} // End if VERTICAL SCALE TYPE
if( pscale->type == HORIZONTAL ) // Horizontal scale
{
if( pscale->orientation == TOP ) {
marker_y = pscale->scrn_pos.bottom;
}
else {
if( pscale->orientation == BOTTOM ) {
marker_y = pscale->scrn_pos.bottom - 6;
}
}
drawOneLine( pscale->scrn_pos.left,
pscale->scrn_pos.bottom,
pscale->scrn_pos.right,
pscale->scrn_pos.bottom );
if( pscale->orientation == TOP )
{
drawOneLine( pscale->scrn_pos.left,
pscale->scrn_pos.bottom,
pscale->scrn_pos.left,
pscale->scrn_pos.bottom + 3 );
drawOneLine( pscale->scrn_pos.right,
pscale->scrn_pos.bottom,
pscale->scrn_pos.right,
pscale->scrn_pos.bottom + 6 );
drawOneLine( pscale->mid_scr,
pscale->scrn_pos.bottom,
pscale->mid_scr,
pscale->scrn_pos.bottom - 6 );
}
else {
if( pscale->orientation == BOTTOM )
{
drawOneLine( pscale->scrn_pos.left,
pscale->scrn_pos.bottom,
pscale->scrn_pos.left,
pscale->scrn_pos.bottom - 6 );
drawOneLine( pscale->scrn_pos.right,
pscale->scrn_pos.bottom,
pscale->scrn_pos.right,
pscale->scrn_pos.bottom - 6 );
drawOneLine( pscale->mid_scr,
pscale->scrn_pos.bottom,
pscale->mid_scr,
pscale->scrn_pos.bottom + 6 );
}
}
for( i = (int)(vmin); i <= (int)(vmax); i++ ) // increment is faster than addition
{
if( pscale->sub_type == LIMIT ) {
condition = (i >= pscale->minimum_value);
}
else {
if( pscale->sub_type == NOLIMIT ) {
condition = 1;
}
}
if( condition ) {
marker_x = (int)(pscale->scrn_pos.left + (i - vmin) * pscale->factor);
if( (i%pscale->div_min) == 0 ) {
if( pscale->orientation == TOP )
{
drawOneLine( marker_x, marker_y, marker_x, marker_y + 3 );
}
else {
if( pscale->orientation == BOTTOM )
{
drawOneLine( marker_x, marker_y + 3, marker_x, marker_y + 6 );
}
}
}
if( (i%pscale->div_max)==0 )
{
if(pscale->modulo) {
disp_val = i % pscale->modulo;
if( !disp_val ) {
disp_val = pscale->modulo;
}
if( disp_val < 0) {
disp_val += pscale->modulo;
}
if( disp_val == pscale->modulo ) {
disp_val = 0;
}
}
else {
disp_val = i;
}
sprintf( TextScale, "%d", disp_val );
if( pscale->orientation == TOP )
{
drawOneLine( marker_x, marker_y, marker_x, marker_y+6 );
textString ( marker_x - 4 * strlen(TextScale), marker_y + 14,
TextScale, GLUT_BITMAP_8_BY_13 );
}
else {
if( pscale->orientation == BOTTOM )
{
drawOneLine( marker_x, marker_y, marker_x, marker_y+6 );
textString ( marker_x - 4 * strlen(TextScale), marker_y - 14,
TextScale, GLUT_BITMAP_8_BY_13 );
}
}
}
}
}
}
}
//
// Draws a climb ladder in the center of the HUD
//
static void drawladder( HUD_ladder *ladder )
{
double vmin, vmax;
double roll_value, pitch_value;
int marker_x, marker_y;
#ifdef DEBUGHUD
int mid_scr;
#endif
int scr_min, scr_max;
int x_ini, x_end;
int y_ini, y_end;
int new_x_ini, new_x_end;
int new_y_ini, new_y_end;
register i;
double factor;
char TextLadder[80];
int condition;
double cos_roll_value, sin_roll_value;
// double cos_pitch_value, sin_pitch_value;
roll_value = (*ladder->load_roll)();
sin_roll_value = sin(roll_value);
cos_roll_value = cos(roll_value);
pitch_value = (*ladder->load_pitch)()*RAD_TO_DEG;
vmin = pitch_value - ladder->width_units/2;
vmax = pitch_value + ladder->width_units/2;
scr_min = ladder->scrn_pos.y - (ladder->scr_height/2);
scr_max = scr_min + ladder->scr_height;
#ifdef DEBUGHUD
mid_scr = scr_min + (scr_max-scr_min)/2;
#endif
marker_x = ladder->scrn_pos.x - ladder->scr_width/2;
factor = (scr_max-scr_min)/ladder->width_units;
for( i=(int)(vmin); i<=(int)(vmax); i+=1 )
{
condition = 1;
if( condition )
{
marker_y = (int)(scr_min+(i-vmin)*factor);
if( i%ladder->div_units==0 )
{
sprintf( TextLadder, "%d", i );
if( ladder->scr_hole == 0 )
{
if( i ) {
x_ini = ladder->scrn_pos.x - ladder->scr_width/2;
}
else {
x_ini = ladder->scrn_pos.x - ladder->scr_width/2 - 10;
}
y_ini = marker_y;
x_end = ladder->scrn_pos.x + ladder->scr_width/2;
y_end = marker_y;
new_x_ini = (int)(ladder->scrn_pos.x + \
(x_ini - ladder->scrn_pos.x) * cos_roll_value - \
(y_ini - ladder->scrn_pos.y) * sin_roll_value);
new_y_ini = (int)(ladder->scrn_pos.y + \
(x_ini - ladder->scrn_pos.x) * sin_roll_value + \
(y_ini - ladder->scrn_pos.y) * cos_roll_value);
new_x_end = (int)(ladder->scrn_pos.x + \
(x_end - ladder->scrn_pos.x) * cos_roll_value - \
(y_end - ladder->scrn_pos.y) * sin_roll_value);
new_y_end = (int)(ladder->scrn_pos.y + \
(x_end - ladder->scrn_pos.x) * sin_roll_value + \
(y_end - ladder->scrn_pos.y) * cos_roll_value);
if( i >= 0 )
{
drawOneLine( new_x_ini, new_y_ini, new_x_end, new_y_end );
}
else
{
glEnable(GL_LINE_STIPPLE);
glLineStipple( 1, 0x00FF );
drawOneLine( new_x_ini, new_y_ini, new_x_end, new_y_end );
glDisable(GL_LINE_STIPPLE);
}
textString( new_x_ini - 8 * strlen(TextLadder) - 8,
new_y_ini - 4,
TextLadder, GLUT_BITMAP_8_BY_13 );
textString( new_x_end + 10,
new_y_end - 4,
TextLadder, GLUT_BITMAP_8_BY_13 );
}
else
{
if( i != 0 ) {
x_ini = ladder->scrn_pos.x - ladder->scr_width/2;
}
else {
x_ini = ladder->scrn_pos.x - ladder->scr_width/2 - 10;
}
y_ini = marker_y;
x_end = ladder->scrn_pos.x - ladder->scr_width/2 + ladder->scr_hole/2;
y_end = marker_y;
new_x_ini = (int)(ladder->scrn_pos.x+ \
(x_ini - ladder->scrn_pos.x) * cos_roll_value -\
(y_ini - ladder->scrn_pos.y) * sin_roll_value);
new_y_ini = (int)(ladder->scrn_pos.y+ \
(x_ini - ladder->scrn_pos.x) * sin_roll_value +\
(y_ini - ladder->scrn_pos.y) * cos_roll_value);
new_x_end = (int)(ladder->scrn_pos.x+ \
(x_end - ladder->scrn_pos.x) * cos_roll_value -\
(y_end - ladder->scrn_pos.y) * sin_roll_value);
new_y_end = (int)(ladder->scrn_pos.y+ \
(x_end - ladder->scrn_pos.x) * sin_roll_value +\
(y_end - ladder->scrn_pos.y) * cos_roll_value);
if( i >= 0 )
{
drawOneLine( new_x_ini, new_y_ini, new_x_end, new_y_end );
}
else
{
glEnable(GL_LINE_STIPPLE);
glLineStipple( 1, 0x00FF );
drawOneLine( new_x_ini, new_y_ini, new_x_end, new_y_end );
glDisable(GL_LINE_STIPPLE);
}
textString( new_x_ini - 8 * strlen(TextLadder) - 8,
new_y_ini - 4,
TextLadder, GLUT_BITMAP_8_BY_13 );
x_ini = ladder->scrn_pos.x + ladder->scr_width/2 - ladder->scr_hole/2;
y_ini = marker_y;
if( i != 0 ) {
x_end = ladder->scrn_pos.x + ladder->scr_width/2;
}
else {
x_end = ladder->scrn_pos.x + ladder->scr_width/2 + 10;
}
y_end = marker_y;
new_x_ini = (int)(ladder->scrn_pos.x + \
(x_ini-ladder->scrn_pos.x)*cos_roll_value -\
(y_ini-ladder->scrn_pos.y)*sin_roll_value);
new_y_ini = (int)(ladder->scrn_pos.y + \
(x_ini-ladder->scrn_pos.x)*sin_roll_value +\
(y_ini-ladder->scrn_pos.y)*cos_roll_value);
new_x_end = (int)(ladder->scrn_pos.x + \
(x_end-ladder->scrn_pos.x)*cos_roll_value -\
(y_end-ladder->scrn_pos.y)*sin_roll_value);
new_y_end = (int)(ladder->scrn_pos.y + \
(x_end-ladder->scrn_pos.x)*sin_roll_value +\
(y_end-ladder->scrn_pos.y)*cos_roll_value);
if( i >= 0 )
{
drawOneLine( new_x_ini, new_y_ini, new_x_end, new_y_end );
}
else
{
glEnable(GL_LINE_STIPPLE);
glLineStipple( 1, 0x00FF );
drawOneLine( new_x_ini, new_y_ini, new_x_end, new_y_end );
glDisable(GL_LINE_STIPPLE);
}
textString( new_x_end+10, new_y_end-4,
TextLadder, GLUT_BITMAP_8_BY_13 );
}
}
/* if( i%pscale->div_max==0 )
{
drawOneLine( marker_x, marker_y, marker_x+6, marker_y );
sprintf( TextScale, "%d", i );
if( pscale->orientation == LEFT )
{
textString( marker_x-8*strlen(TextScale)-2, marker_y-4,
TextScale, GLUT_BITMAP_8_BY_13 );
}
else if( pscale->orientation == RIGHT )
{
textString( marker_x+10, marker_y-4,
TextScale, GLUT_BITMAP_8_BY_13 );
}
} */
}
}
}
//
// Draws an artificial horizon line in the center of the HUD
// (with or without a center hole)
//
// Needs: x_center, y_center, length, hole
//
static void drawhorizon( HUD_horizon *horizon )
{
int x_inc1, y_inc1;
int x_inc2, y_inc2;
int x_t_inc1, y_t_inc1;
int d_bottom_x, d_bottom_y;
int d_right_x, d_right_y;
int d_top_x, d_top_y;
int d_left_x, d_left_y;
int inc_b_x, inc_b_y;
int inc_r_x, inc_r_y;
int inc_t_x, inc_t_y;
int inc_l_x, inc_l_y;
// struct fgFLIGHT *f = &current_aircraft.flight;
double sin_bank, cos_bank;
double bank_angle, sideslip_angle;
double ss_const; // sideslip angle pixels per rad
bank_angle = (*horizon->load_roll)(); // Roll limit +/- 30 degrees
if( bank_angle < -FG_PI_2/3 ) {
bank_angle = -FG_PI_2/3;
}else if( bank_angle > FG_PI_2/3 ) {
bank_angle = FG_PI_2/3;
}
sideslip_angle = (*horizon->load_sideslip)(); // Sideslip limit +/- 5 degrees
if( sideslip_angle < -FG_PI/36.0 ) {
sideslip_angle = -FG_PI/36.0;
} else if( sideslip_angle > FG_PI/36.0 ) {
sideslip_angle = FG_PI/36.0;
}
// sin_bank = sin( FG_2PI-FG_Phi );
// cos_bank = cos( FG_2PI-FG_Phi );
sin_bank = sin(FG_2PI-bank_angle);
cos_bank = cos(FG_2PI-bank_angle);
x_inc1 = (int)(horizon->scr_width * cos_bank);
y_inc1 = (int)(horizon->scr_width * sin_bank);
x_inc2 = (int)(horizon->scr_hole * cos_bank);
y_inc2 = (int)(horizon->scr_hole * sin_bank);
x_t_inc1 = (int)(horizon->tee_height * sin_bank);
y_t_inc1 = (int)(horizon->tee_height * cos_bank);
d_bottom_x = 0;
d_bottom_y = (int)(-horizon->scr_hole);
d_right_x = (int)(horizon->scr_hole);
d_right_y = 0;
d_top_x = 0;
d_top_y = (int)(horizon->scr_hole);
d_left_x = (int)(-horizon->scr_hole);
d_left_y = 0;
ss_const = (horizon->scr_width*2)/(FG_2PI/36.0);// width represents 10 degrees
d_bottom_x += (int)(sideslip_angle*ss_const);
d_right_x += (int)(sideslip_angle*ss_const);
d_left_x += (int)(sideslip_angle*ss_const);
d_top_x += (int)(sideslip_angle*ss_const);
inc_b_x = (int)(d_bottom_x*cos_bank-d_bottom_y*sin_bank);
inc_b_y = (int)(d_bottom_x*sin_bank+d_bottom_y*cos_bank);
inc_r_x = (int)(d_right_x*cos_bank-d_right_y*sin_bank);
inc_r_y = (int)(d_right_x*sin_bank+d_right_y*cos_bank);
inc_t_x = (int)(d_top_x*cos_bank-d_top_y*sin_bank);
inc_t_y = (int)(d_top_x*sin_bank+d_top_y*cos_bank);
inc_l_x = (int)(d_left_x*cos_bank-d_left_y*sin_bank);
inc_l_y = (int)(d_left_x*sin_bank+d_left_y*cos_bank);
if( horizon->scr_hole == 0 )
{
drawOneLine( horizon->scrn_pos.x - x_inc1, horizon->scrn_pos.y - y_inc1, \
horizon->scrn_pos.x + x_inc1, horizon->scrn_pos.y + y_inc1 );
}
else
{
drawOneLine( horizon->scrn_pos.x - x_inc1, horizon->scrn_pos.y - y_inc1, \
horizon->scrn_pos.x - x_inc2, horizon->scrn_pos.y - y_inc2 );
drawOneLine( horizon->scrn_pos.x + x_inc2, horizon->scrn_pos.y + y_inc2, \
horizon->scrn_pos.x + x_inc1, horizon->scrn_pos.y + y_inc1 );
}
// draw teemarks (?)
drawOneLine( horizon->scrn_pos.x + x_inc2, horizon->scrn_pos.y + y_inc2, \
horizon->scrn_pos.x + x_inc2 + x_t_inc1, horizon->scrn_pos.y + y_inc2 - y_t_inc1 );
drawOneLine( horizon->scrn_pos.x - x_inc2, horizon->scrn_pos.y - y_inc2, \
horizon->scrn_pos.x - x_inc2 + x_t_inc1, horizon->scrn_pos.y - y_inc2 - y_t_inc1 );
// draw sideslip diamond (it is not yet positioned correctly )
drawOneLine( horizon->scrn_pos.x + inc_b_x, \
horizon->scrn_pos.y + inc_b_y, \
horizon->scrn_pos.x + inc_r_x, \
horizon->scrn_pos.y + inc_r_y )
drawOneLine( horizon->scrn_pos.x + inc_r_x, \
horizon->scrn_pos.y + inc_r_y, \
horizon->scrn_pos.x + inc_t_x, \
horizon->scrn_pos.y + inc_t_y );
drawOneLine( horizon->scrn_pos.x + inc_t_x, \
horizon->scrn_pos.y + inc_t_y, \
horizon->scrn_pos.x + inc_l_x, \
horizon->scrn_pos.y + inc_l_y );
drawOneLine( horizon->scrn_pos.x + inc_l_x, \
horizon->scrn_pos.y + inc_l_y, \
horizon->scrn_pos.x + inc_b_x, \
horizon->scrn_pos.y + inc_b_y );
/* drawOneLine( horizon->scrn_pos.x + inc_b_x, \
horizon->scrn_pos.y + inc_b_y, \
horizon->scrn_pos.x + inc_r_x, \
horizon->scrn_pos.y + inc_r_y )
drawOneLine( horizon->scrn_pos.x + inc_r_x, \
horizon->scrn_pos.y + inc_r_y, \
horizon->scrn_pos.x + inc_t_x, \
horizon->scrn_pos.y + inc_t_y );
drawOneLine( horizon->scrn_pos.x + inc_t_x, \
horizon->scrn_pos.y + inc_t_y, \
horizon->scrn_pos.x + inc_l_x, \
horizon->scrn_pos.y + inc_l_y );
drawOneLine( horizon->scrn_pos.x + inc_l_x, \
horizon->scrn_pos.y + inc_l_y, \
horizon->scrn_pos.x + inc_b_x, \
horizon->scrn_pos.y + inc_b_y ); */
}
// drawControlSurfaces()
// Draws a representation of the control surfaces in their current state
// anywhere in the HUD
//
static void drawControlSurfaces( HUD_control_surfaces *ctrl_surf )
{
int x_ini, y_ini;
int x_end, y_end;
/* int x_1, y_1; */
/* int x_2, y_2; */
fgCONTROLS *pCtls;
int tmp;
x_ini = ctrl_surf->scrn_pos.x;
y_ini = ctrl_surf->scrn_pos.y;
x_end = x_ini + 150;
y_end = y_ini + 60;
drawOneLine( x_ini, y_ini, x_end, y_ini );
drawOneLine( x_ini, y_ini, x_ini, y_end );
drawOneLine( x_ini, y_end, x_end, y_end );
drawOneLine( x_end, y_end, x_end, y_ini );
drawOneLine( x_ini + 30, y_ini, x_ini + 30, y_end );
drawOneLine( x_ini + 30, y_ini + 30, x_ini + 90, y_ini + 30 );
drawOneLine( x_ini + 90, y_ini, x_ini + 90, y_end );
drawOneLine( x_ini + 120, y_ini, x_ini + 120, y_end );
pCtls = current_aircraft.controls;
/* Draw elevator diagram */
textString( x_ini + 1, y_end-11, "E", GLUT_BITMAP_8_BY_13 );
drawOneLine( x_ini + 15, y_ini + 5, x_ini + 15, y_ini + 55 );
drawOneLine( x_ini + 14, y_ini + 30, x_ini + 16, y_ini + 30 );
tmp = y_ini + 5 + (int)(((pCtls->elevator + 1.0)/2)*50.0);
if( pCtls->elevator <= -0.01 || pCtls->elevator >= 0.01 )
{
drawOneLine( x_ini + 10, tmp, x_ini + 20, tmp );
}
else
{
drawOneLine( x_ini + 7, tmp, x_ini + 23, tmp);
}
/* Draw aileron diagram */
textString( x_ini + 30 + 1, y_end-11, "A", GLUT_BITMAP_8_BY_13 );
drawOneLine( x_ini + 35, y_end-15, x_ini + 85, y_end-15 );
drawOneLine( x_ini + 60, y_end-14, x_ini + 60, y_end-16 );
tmp = x_ini + 35 + (int)(((pCtls->aileron + 1.0)/2)*50.0);
if( pCtls->aileron <= -0.01 || pCtls->aileron >= 0.01 )
{
drawOneLine( tmp, y_end-20, tmp, y_end-10 );
}
else
{
drawOneLine( tmp, y_end - 25, tmp, y_end - 5 );
}
/* Draw rudder diagram */
textString ( x_ini + 30 + 1, y_ini + 21, "R", GLUT_BITMAP_8_BY_13 );
drawOneLine( x_ini + 35, y_ini + 15, x_ini + 85, y_ini + 15 );
drawOneLine( x_ini + 60, y_ini + 14, x_ini + 60, y_ini + 16 );
tmp = x_ini + 35 + (int)(((pCtls->rudder + 1.0) / 2) * 50.0);
if( pCtls->rudder <= -0.01 || pCtls->rudder >= 0.01 )
{
drawOneLine( tmp, y_ini + 20, tmp, y_ini + 10 );
}
else
{
drawOneLine( tmp, y_ini + 25, tmp, y_ini + 5 );
}
/* Draw throttle diagram */
textString( x_ini + 90 + 1, y_end-11, "T", GLUT_BITMAP_8_BY_13 );
textString( x_ini + 90 + 1, y_end-21, "r", GLUT_BITMAP_8_BY_13 );
drawOneLine( x_ini + 105, y_ini + 5, x_ini + 105, y_ini + 55 );
tmp = y_ini + 5 + (int)(pCtls->throttle[0]*50.0);
drawOneLine( x_ini + 100, tmp, x_ini + 110, tmp);
/* Draw elevator trim diagram */
textString( x_ini + 121, y_end-11, "T", GLUT_BITMAP_8_BY_13 );
textString( x_ini + 121, y_end-22, "m", GLUT_BITMAP_8_BY_13 );
drawOneLine( x_ini + 135, y_ini + 5, x_ini + 135, y_ini + 55 );
drawOneLine( x_ini + 134, y_ini + 30, x_ini + 136, y_ini + 30 );
tmp = y_ini + 5 + (int)(((pCtls->elevator_trim + 1)/2)*50.0);
if( pCtls->elevator_trim <= -0.01 || pCtls->elevator_trim >= 0.01 )
{
drawOneLine( x_ini + 130, tmp, x_ini + 140, tmp);
}
else
{
drawOneLine( x_ini + 127, tmp, x_ini + 143, tmp);
}
}
//
// Draws a label anywhere in the HUD
//
//
static void drawlabel( HUD_label *label )
{
char buffer[80];
char string[80];
int posincr;
int lenstr;
if( !label ) { // Eliminate the possible, but absurd case.
return;
}
if( label->pre_str != NULL) {
if( label->post_str != NULL ) {
sprintf( buffer, "%s%s%s", label->pre_str, \
label->format, \
label->post_str );
}
else {
sprintf( buffer, "%s%s", label->pre_str, \
label->format );
}
}
else {
if( label->post_str != NULL ) {
sprintf( buffer, "%s%s", label->format, \
label->post_str );
}
} // else do nothing if both pre and post strings are nulls. Interesting.
sprintf( string, buffer, (*label->load_value)() );
#ifdef DEBUGHUD
fgPrintf( FG_COCKPIT, FG_DEBUG, buffer );
fgPrintf( FG_COCKPIT, FG_DEBUG, "\n" );
fgPrintf( FG_COCKPIT, FG_DEBUG, string );
fgPrintf( FG_COCKPIT, FG_DEBUG, "\n" );
#endif
lenstr = strlen( string );
if( label->justify == LEFT_JUST ) {
posincr = -lenstr*8;
}
else {
if( label->justify == CENTER_JUST ) {
posincr = -lenstr*4;
}
else {
if( label->justify == RIGHT_JUST ) {
posincr = 0;
}
}
}
if( label->size == SMALL ) {
textString( label->scrn_pos.x + posincr, label->scrn_pos.y,
string, GLUT_BITMAP_8_BY_13);
}
else {
if( label->size == LARGE ) {
textString( label->scrn_pos.x + posincr, label->scrn_pos.y,
string, GLUT_BITMAP_9_BY_15);
}
}
}
// The following routines concern HUD object/component object construction
//
// fgHUDInit
//
// Constructs a HUD object and then adds in instruments. At the present
// the instruments are hard coded into the routine. Ultimately these need
// to be defined by the aircraft's instrumentation records so that the
// display for a Piper Cub doesn't show the speed range of a North American
// mustange and the engine readouts of a B36!
//
Hptr fgHUDInit( fgAIRCRAFT *current_aircraft )
{
Hptr hud;
fgPrintf( FG_COCKPIT, FG_INFO, "Initializing HUD\n" );
hud = (Hptr)calloc(sizeof( HUD),1);
if( hud == NULL )
return( NULL );
hud->code = 1;
hud->status = 0;
// For now lets just hardcode the hud here.
// In the future, hud information has to come from the same place
// aircraft information came from.
fgHUDSetTimeMode( hud, NIGHT );
fgHUDSetBrightness( hud, BRT_LIGHT );
// TBI
fgHUDAddHorizon( hud, 330, 100, 40, 5, 10, get_roll, get_sideslip );
fgHUDAddLadder ( hud, 330, 285, 120, 180, 70, 10,
NONE, 45, get_roll, get_pitch );
// KIAS
fgHUDAddScale ( hud, VERTICAL, LIMIT, 200, 180, 380, 5, 10,
LEFT, 0, 100, 50, 0, get_speed );
// Angle of Attack
fgHUDAddScale ( hud, HORIZONTAL, NOLIMIT, 180, 250, 410, 1, 5,
BOTTOM, -40, 50, 21, 0, get_aoa );
// GYRO COMPASS
fgHUDAddScale ( hud, HORIZONTAL, NOLIMIT, 380, 200, 460, 5, 10,
TOP, 0, 50, 50, 360, get_heading );
// AMSL
fgHUDAddScale ( hud, VERTICAL, LIMIT, 460, 180, 380, 25, 100,
RIGHT, 0, 15000, 250, 0, get_altitude);
fgHUDAddLabel ( hud, 160, 150, SMALL, NOBLINK,
RIGHT_JUST, NULL, " Kts", "%5.0f", get_speed );
fgHUDAddLabel ( hud, 160, 135, SMALL, NOBLINK,
RIGHT_JUST, NULL, " m", "%5.0f", get_altitude );
fgHUDAddLabel ( hud, 160, 120, SMALL, NOBLINK,
RIGHT_JUST, NULL, " Roll", "%5.2f", get_roll );
fgHUDAddLabel ( hud, 160, 105, SMALL, NOBLINK,
RIGHT_JUST, "Lat ", "d", "%03.0f", get_latitude );
fgHUDAddLabel ( hud, 160, 90, SMALL, NOBLINK,
RIGHT_JUST, NULL, " m", "%05.2f", get_lat_min );
fgHUDAddLabel ( hud, 440, 150, SMALL, NOBLINK,
RIGHT_JUST, NULL, " AOA", "%5.2f", get_aoa );
fgHUDAddLabel ( hud, 440, 135, SMALL, NOBLINK,
RIGHT_JUST, NULL, " Heading", "%5.0f", get_heading );
fgHUDAddLabel ( hud, 440, 120, SMALL, NOBLINK,
RIGHT_JUST, NULL, " Sideslip", "%5.2f", get_sideslip );
fgHUDAddLabel ( hud, 440, 105, SMALL, NOBLINK,
RIGHT_JUST, "Lon ", "d", "%04.0f", get_longitude );
fgHUDAddLabel ( hud, 440, 90, SMALL, NOBLINK,
RIGHT_JUST, NULL, " m", "%05.2f", get_long_min );
fgHUDAddControlSurfaces( hud, 10, 10, NULL );
// fgHUDAddControl( hud, HORIZONTAL, 50, 25, get_aileronval ); // was 10, 10
// fgHUDAddControl( hud, VERTICAL, 150, 25, get_elevatorval ); // was 10, 10
// fgHUDAddControl( hud, HORIZONTAL, 250, 25, get_rudderval ); // was 10, 10
return( hud );
}
// add_instrument
//
// This is a stand in for linked list code that will get replaced later
// by some more elegant list handling code.
void add_instrument( Hptr hud, HIptr pinstrument )
{
if( !hud || !pinstrument ) {
return;
}
pinstrument->next = hud->instruments;
hud->instruments = pinstrument;
}
// fgHUDAddHorizon
//
// Constructs a HUD_horizon "object" and installs it into the hud instrument
// list.
Hptr fgHUDAddHorizon( Hptr hud, \
int x_pos, \
int y_pos, \
int length, \
int hole_len, \
int tee_height,\
double (*load_roll)(),
double (*load_sideslip)() )
{
HUD_horizon *phorizon;
HUD_instr *pinstrument;
if( !hud ) {
return NULL;
}
// construct the parent object
pinstrument = (HIptr)calloc(sizeof(HUD_instr),1);
if( pinstrument == NULL ) {
return( NULL );
}
pinstrument->type = HUDhorizon; // ARTIFICIAL_HORIZON;
// Construct the horizon
phorizon = (HUD_horizon *) calloc( sizeof(HUD_horizon),1);
if( phorizon == NULL ) {
return( NULL );
}
phorizon->scrn_pos.x = x_pos;
phorizon->scrn_pos.y = y_pos;
phorizon->scr_width = length | 1;
phorizon->scr_hole = hole_len;
phorizon->tee_height = tee_height;
phorizon->load_roll = load_roll;
phorizon->load_sideslip = load_sideslip;
// Install the horizon in the parent.
pinstrument->instr = phorizon;
// Install the instrument into hud.
add_instrument( hud, pinstrument);
return( hud );
}
// fgHUDAddScale
//
// Constructs a HUD_scale "object" and installs it into the hud instrument
// list.
Hptr fgHUDAddScale( Hptr hud, \
int type, \
int sub_type, \
int scr_pos, \
int scr_min, \
int scr_max, \
int div_min, \
int div_max, \
int orientation, \
int min_value, \
int max_value, \
int width_units, \
int modulus, \
double (*load_value)() )
{
HUD_scale *pscale;
HUD_instr *pinstrument;
if( !hud ) {
return NULL;
}
pinstrument = (HIptr)calloc(sizeof(HUD_instr),1);
if( pinstrument == NULL ) {
return( NULL );
}
pinstrument->type = HUDscale;
pscale = ( HUD_scale *)calloc(sizeof(HUD_scale),1);
if( pscale == NULL ) {
return( NULL );
}
pscale->type = type;
pscale->sub_type = sub_type;
pscale->div_min = div_min;
pscale->div_max = div_max;
pscale->orientation = orientation;
pscale->minimum_value = min_value;
pscale->maximum_value = max_value;
pscale->modulo = modulus;
pscale->load_value = load_value;
pscale->half_width_units = width_units / 2.0;
pscale->scr_span = scr_max - scr_min; // Run of scan in pix coord
pscale->scr_span |= 1; // Force odd span of units.
// If span is odd number of units, mid will be correct.
// If not it will be high by one coordinate unit. This is
// an artifact of integer division needed for screen loc's.
pscale->mid_scr = (pscale->scr_span >> 1) + scr_min;
// Calculate the number of screen units per indicator unit
// We must force floating point calculation or the factor
// will be low and miss locate tics by several units.
pscale->factor = (double)pscale->scr_span / (double)width_units;
switch( type ) {
case HORIZONTAL:
pscale->scrn_pos.left = scr_min;
pscale->scrn_pos.top = scr_pos;
pscale->scrn_pos.right = scr_max;
pscale->scrn_pos.bottom = scr_pos;
break;
case VERTICAL:
default:
pscale->scrn_pos.left = scr_pos;
pscale->scrn_pos.top = scr_max;
pscale->scrn_pos.right = scr_pos;
pscale->scrn_pos.bottom = scr_min;
}
// Install the scale
pinstrument->instr = pscale;
// Install the instrument into hud.
add_instrument( hud, pinstrument);
return( hud );
}
// fgHUDAddLabel
//
// Constructs a HUD_Label object and installs it into the hud instrument
// list.
Hptr fgHUDAddLabel( Hptr hud, \
int x_pos, \
int y_pos, \
int size, \
int blink, \
int justify, \
char *pre_str, \
char *post_str, \
char *format, \
double (*load_value)() )
{
HUD_label *plabel;
HUD_instr *pinstrument;
if( !hud ) {
return NULL;
}
pinstrument = (HIptr)calloc(sizeof(HUD_instr),1);
if( pinstrument == NULL ) {
return NULL;
}
pinstrument->type = HUDlabel;
plabel = (HUD_label *)calloc(sizeof(HUD_label),1);
if( plabel == NULL ){
return NULL;
}
plabel->scrn_pos.x = x_pos;
plabel->scrn_pos.y = y_pos;
plabel->size = size;
plabel->blink = blink;
plabel->justify = justify;
plabel->pre_str = pre_str;
plabel->post_str = post_str;
plabel->format = format;
plabel->load_value = load_value;
// Install the label
pinstrument->instr = plabel;
// Install the instrument into hud.
add_instrument( hud, pinstrument);
return( hud );
}
// fgHUDAddLadder
//
// Contains code that constructs a ladder "object" and installs it as
// a hud instrument in the hud instrument list.
//
Hptr fgHUDAddLadder( Hptr hud, \
int x_pos, \
int y_pos, \
int scr_width, \
int scr_height, \
int hole_len, \
int div_units, \
int label_pos, \
int width_units, \
double (*load_roll)(),
double (*load_pitch)() )
{
HUD_ladder *pladder;
HUD_instr *pinstrument;
if( !hud ) {
return NULL;
}
pinstrument = (HIptr)calloc(sizeof(HUD_instr),1);
if( pinstrument == NULL )
return( NULL );
pinstrument->type = HUDladder;
pladder = (HUD_ladder *)calloc(sizeof(HUD_ladder),1);
if( pladder == NULL )
return( NULL );
pladder->type = 0; // Not used.
pladder->scrn_pos.x = x_pos;
pladder->scrn_pos.y = y_pos;
pladder->scr_width = scr_width;
pladder->scr_height = scr_height;
pladder->scr_hole = hole_len;
pladder->div_units = div_units;
pladder->label_position = label_pos;
pladder->width_units = width_units;
pladder->load_roll = load_roll;
pladder->load_pitch = load_pitch;
pinstrument->instr = pladder;
// Install the instrument into hud.
add_instrument( hud, pinstrument);
return hud;
}
// fgHUDAddControlSurfaces()
//
// Adds the control surface indicators which make up for the lack of seat
// of the pants feel. Should be unnecessary with joystick and pedals
// enabled. But that is another improvement. Also, what of flaps? Spoilers?
// This may need to be expanded or flattened into multiple indicators,
// vertical and horizontal.
Hptr fgHUDAddControlSurfaces( Hptr hud,
int x_pos,
int y_pos,
double (*load_value)() )
{
HUD_control_surfaces *pcontrol_surfaces;
HUD_instr *pinstrument;
if( !hud ) {
return NULL;
}
// Construct shell
pinstrument = (HIptr)calloc(sizeof(HUD_instr),1);
if( !pinstrument ) {
return NULL;
}
pinstrument->type = HUDcontrol_surfaces;
// Construct core
pcontrol_surfaces = (HUD_control_surfaces *)calloc(sizeof(HUD_control),1);
if( !pcontrol_surfaces ) {
return( NULL );
}
pcontrol_surfaces->scrn_pos.x = x_pos;
pcontrol_surfaces->scrn_pos.y = y_pos;
pcontrol_surfaces->load_value = load_value;
pinstrument->instr = pcontrol_surfaces;
// Install
add_instrument( hud, pinstrument);
return hud;
}
// fgHUDAddControl
//
//
Hptr fgHUDAddControl( Hptr hud, \
int ctrl_x, \
int ctrl_y, \
int ctrl_length, \
int orientation, \
int alignment, \
int min_value, \
int max_value, \
int width_units, \
double (*load_value)() )
{
HUD_control *pcontrol;
HUD_instr *pinstrument;
if( !hud ) {
return NULL;
}
// Construct shell
pinstrument = (HIptr)calloc(sizeof(HUD_instr),1);
if( !pinstrument ) {
return NULL;
}
pinstrument->type = HUDcontrol;
// Construct core
pcontrol = (HUD_control *)calloc(sizeof(HUD_control),1);
if( !(pcontrol == NULL) ) {
return( NULL );
}
pcontrol->scrn_pos.x = ctrl_x;
pcontrol->scrn_pos.y = ctrl_y;
pcontrol->ctrl_length = ctrl_length;
pcontrol->orientation = orientation;
pcontrol->alignment = alignment;
pcontrol->min_value = min_value;
pcontrol->max_value = max_value;
pcontrol->width_units = width_units;
pcontrol->load_value = load_value;
// Integrate
pinstrument->instr = pcontrol;
// Install
add_instrument( hud, pinstrument);
return hud;
}
/*
Hptr fgHUDAddMovingHorizon( Hptr hud, \
int x_pos, \
int y_pos, \
int length, \
int hole_len, \
int color )
{
}
Hptr fgHUDAddCircularLadder( Hptr hud, \
int scr_min, \
int scr_max, \
int div_min, \
int div_max, \
int max_value )
{
}
Hptr fgHUDAddNumDisp( Hptr hud, \
int x_pos, \
int y_pos, \
int size, \
int color, \
int blink, \
char *pre_str, \
char *post_str )
{
}
*/
// fgUpdateHUD
//
// Performs a once around the list of calls to instruments installed in
// the HUD object with requests for redraw. Kinda. It will when this is
// all C++.
//
void fgUpdateHUD( Hptr hud ) {
HIptr phud_instr;
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluOrtho2D(0, 640, 0, 480);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glColor3f(1.0, 1.0, 1.0);
glIndexi(7);
glDisable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
glLineWidth(1);
// This is a good improvement, but needs
// to respond to a dial instead of time
// of day. Of course, we have no dial!
if( hud->time_of_day==DAY) {
switch (hud->brightness) {
case BRT_LIGHT:
glColor3f (0.1, 0.9, 0.1);
break;
case BRT_MEDIUM:
glColor3f (0.1, 0.7, 0.0);
break;
case BRT_DARK:
glColor3f (0.0, 0.5, 0.0);
}
}
else if( hud->time_of_day==NIGHT) {
switch (hud->brightness) {
case BRT_LIGHT:
glColor3f (0.9, 0.1, 0.1);
break;
case BRT_MEDIUM:
glColor3f (0.7, 0.0, 0.1);
break;
case BRT_DARK:
glColor3f (0.5, 0.0, 0.0);
}
}
else {
glColor3f (0.1, 0.9, 0.1);
}
fgPrintf( FG_COCKPIT, FG_DEBUG, "HUD Code %d Status %d\n",
hud->code, hud->status );
phud_instr = hud->instruments;
while( phud_instr ) {
/* printf("Drawing Instrument %d\n", phud_instr->type); */
switch (phud_instr->type) {
case HUDhorizon: // ARTIFICIAL HORIZON
drawhorizon( (pHUDhorizon)phud_instr->instr );
break;
case HUDscale: // Need to simplify this call.
drawscale ( (pHUDscale) phud_instr->instr );
break;
case HUDlabel:
drawlabel ( (pHUDlabel) phud_instr->instr );
break;
case HUDladder:
drawladder( (pHUDladder) phud_instr->instr );
break;
// case HUDcontrol:
// drawControl( (pHUDcontrol) phud_instr->instr );
// break;
case HUDcontrol_surfaces:
drawControlSurfaces( (pHUDControlSurfaces) phud_instr->instr );
break;
default:; // Ignore anything you don't know about.
}
phud_instr = phud_instr->next;
}
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
}
void fgHUDSetTimeMode( Hptr hud, int time_of_day )
{
hud->time_of_day = time_of_day;
}
void fgHUDSetBrightness( Hptr hud, int brightness )
{
hud->brightness = brightness;
}
/* $Log$
/* Revision 1.21 1998/04/03 21:55:28 curt
/* Converting to Gnu autoconf system.
/* Tweaks to hud.c
/*
* Revision 1.20 1998/03/09 22:48:40 curt
* Minor "formatting" tweaks.
*
* Revision 1.19 1998/02/23 20:18:28 curt
* Incorporated Michele America's hud changes.
*
* Revision 1.18 1998/02/21 14:53:10 curt
* Added Charlie's HUD changes.
*
* Revision 1.17 1998/02/20 00:16:21 curt
* Thursday's tweaks.
*
* Revision 1.16 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 1.15 1998/02/16 13:38:39 curt
* Integrated changes from Charlie Hotchkiss.
*
* Revision 1.14 1998/02/12 21:59:41 curt
* Incorporated code changes contributed by Charlie Hotchkiss
* <chotchkiss@namg.us.anritsu.com>
*
* Revision 1.12 1998/02/09 15:07:48 curt
* Minor tweaks.
*
* Revision 1.11 1998/02/07 15:29:34 curt
* Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
* <chotchkiss@namg.us.anritsu.com>
*
* Revision 1.10 1998/02/03 23:20:14 curt
* Lots of little tweaks to fix various consistency problems discovered by
* Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
* passed arguments along to the real printf(). Also incorporated HUD changes
* by Michele America.
*
* Revision 1.9 1998/01/31 00:43:04 curt
* Added MetroWorks patches from Carmen Volpe.
*
* Revision 1.8 1998/01/27 00:47:51 curt
* Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
* system and commandline/config file processing code.
*
* Revision 1.7 1998/01/19 18:40:20 curt
* Tons of little changes to clean up the code and to remove fatal errors
* when building with the c++ compiler.
*
* Revision 1.6 1997/12/15 23:54:34 curt
* Add xgl wrappers for debugging.
* Generate terrain normals on the fly.
*
* Revision 1.5 1997/12/10 22:37:39 curt
* Prepended "fg" on the name of all global structures that didn't have it yet.
* i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
*
* Revision 1.4 1997/09/23 00:29:32 curt
* Tweaks to get things to compile with gcc-win32.
*
* Revision 1.3 1997/09/05 14:17:26 curt
* More tweaking with stars.
*
* Revision 1.2 1997/09/04 02:17:30 curt
* Shufflin' stuff.
*
* Revision 1.1 1997/08/29 18:03:22 curt
* Initial revision.
*
*/
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