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space.c
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/*
* Elite - The New Kind.
*
* Reverse engineered from the BBC disk version of Elite.
* Additional material by C.J.Pinder.
*
* The original Elite code is (C) I.Bell & D.Braben 1984.
* This version re-engineered in C by C.J.Pinder 1999-2001.
*
* email: <[email protected]>
*
*
*/
/*
* space.c
*
* This module handles all the flight system and management of the space universe.
*/
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#include "vector.h"
#include "alg_data.h"
#include "config.h"
#include "elite.h"
#include "gfx.h"
#include "docked.h"
#include "intro.h"
#include "shipdata.h"
#include "shipface.h"
#include "space.h"
#include "threed.h"
#include "sound.h"
#include "main.h"
#include "swat.h"
#include "random.h"
#include "trade.h"
#include "stars.h"
#include "pilot.h"
extern int flight_climb;
extern int flight_roll;
extern int flight_speed;
struct galaxy_seed destination_planet;
int hyper_ready;
int hyper_countdown;
char hyper_name[16];
int hyper_distance;
int hyper_galactic;
void rotate_x_first (double *a, double *b, int direction)
{
double fx,ux;
fx = *a;
ux = *b;
if (direction < 0)
{
*a = fx - (fx / 512) + (ux / 19);
*b = ux - (ux / 512) - (fx / 19);
}
else
{
*a = fx - (fx / 512) - (ux / 19);
*b = ux - (ux / 512) + (fx / 19);
}
}
void rotate_vec (struct vector *vec, double alpha, double beta)
{
double x,y,z;
x = vec->x;
y = vec->y;
z = vec->z;
y = y - alpha * x;
x = x + alpha * y;
y = y - beta * z;
z = z + beta * y;
vec->x = x;
vec->y = y;
vec->z = z;
}
/*
* Update an objects location in the universe.
*/
void move_univ_object (struct univ_object *obj)
{
double x,y,z;
double k2;
double alpha;
double beta;
int rotx,rotz;
double speed;
alpha = flight_roll / 256.0;
beta = flight_climb / 256.0;
x = obj->location.x;
y = obj->location.y;
z = obj->location.z;
if (!(obj->flags & FLG_DEAD))
{
if (obj->velocity != 0)
{
speed = obj->velocity;
speed *= 1.5;
x += obj->rotmat[2].x * speed;
y += obj->rotmat[2].y * speed;
z += obj->rotmat[2].z * speed;
}
if (obj->acceleration != 0)
{
obj->velocity += obj->acceleration;
obj->acceleration = 0;
if (obj->velocity > ship_list[obj->type]->velocity)
obj->velocity = ship_list[obj->type]->velocity;
if (obj->velocity <= 0)
obj->velocity = 1;
}
}
k2 = y - alpha * x;
z = z + beta * k2;
y = k2 - z * beta;
x = x + alpha * y;
z = z - flight_speed;
obj->location.x = x;
obj->location.y = y;
obj->location.z = z;
obj->distance = sqrt (x*x + y*y + z*z);
if (obj->type == SHIP_PLANET)
beta = 0.0;
rotate_vec (&obj->rotmat[2], alpha, beta);
rotate_vec (&obj->rotmat[1], alpha, beta);
rotate_vec (&obj->rotmat[0], alpha, beta);
if (obj->flags & FLG_DEAD)
return;
rotx = obj->rotx;
rotz = obj->rotz;
/* If necessary rotate the object around the X axis... */
if (rotx != 0)
{
rotate_x_first (&obj->rotmat[2].x, &obj->rotmat[1].x, rotx);
rotate_x_first (&obj->rotmat[2].y, &obj->rotmat[1].y, rotx);
rotate_x_first (&obj->rotmat[2].z, &obj->rotmat[1].z, rotx);
if ((rotx != 127) && (rotx != -127))
obj->rotx -= (rotx < 0) ? -1 : 1;
}
/* If necessary rotate the object around the Z axis... */
if (rotz != 0)
{
rotate_x_first (&obj->rotmat[0].x, &obj->rotmat[1].x, rotz);
rotate_x_first (&obj->rotmat[0].y, &obj->rotmat[1].y, rotz);
rotate_x_first (&obj->rotmat[0].z, &obj->rotmat[1].z, rotz);
if ((rotz != 127) && (rotz != -127))
obj->rotz -= (rotz < 0) ? -1 : 1;
}
/* Orthonormalize the rotation matrix... */
tidy_matrix (obj->rotmat);
}
/*
* Dock the player into the space station.
*/
void dock_player (void)
{
disengage_auto_pilot();
docked = 1;
flight_speed = 0;
flight_roll = 0;
flight_climb = 0;
front_shield = 255;
aft_shield = 255;
energy = 255;
myship.altitude = 255;
myship.cabtemp = 30;
reset_weapons();
}
/*
* Check if we are correctly aligned to dock.
*/
int is_docking (int sn)
{
struct vector vec;
double fz;
double ux;
if (auto_pilot) // Don't want it to kill anyone!
return 1;
fz = universe[sn].rotmat[2].z;
if (fz > -0.90)
return 0;
vec = unit_vector (&universe[sn].location);
if (vec.z < 0.927)
return 0;
ux = universe[sn].rotmat[1].x;
if (ux < 0)
ux = -ux;
if (ux < 0.84)
return 0;
return 1;
}
/*
* Game Over...
*/
void do_game_over (void)
{
snd_play_sample (SND_GAMEOVER);
game_over = 1;
}
void update_altitude (void)
{
double x,y,z;
double dist;
myship.altitude = 255;
if (witchspace)
return;
x = fabs(universe[0].location.x);
y = fabs(universe[0].location.y);
z = fabs(universe[0].location.z);
if ((x > 65535) || (y > 65535) || (z > 65535))
return;
x /= 256;
y /= 256;
z /= 256;
dist = (x * x) + (y * y) + (z * z);
if (dist > 65535)
return;
dist -= 9472;
if (dist < 1)
{
myship.altitude = 0;
do_game_over ();
return;
}
dist = sqrt (dist);
if (dist < 1)
{
myship.altitude = 0;
do_game_over ();
return;
}
myship.altitude = dist;
}
void update_cabin_temp (void)
{
int x,y,z;
int dist;
myship.cabtemp = 30;
if (witchspace)
return;
if (ship_count[SHIP_CORIOLIS] || ship_count[SHIP_DODEC])
return;
x = abs((int)universe[1].location.x);
y = abs((int)universe[1].location.y);
z = abs((int)universe[1].location.z);
if ((x > 65535) || (y > 65535) || (z > 65535))
return;
x /= 256;
y /= 256;
z /= 256;
dist = ((x * x) + (y * y) + (z * z)) / 256;
if (dist > 255)
return;
dist ^= 255;
myship.cabtemp = dist + 30;
if (myship.cabtemp > 255)
{
myship.cabtemp = 255;
do_game_over ();
return;
}
if ((myship.cabtemp < 224) || (cmdr.fuel_scoop == 0))
return;
cmdr.fuel += flight_speed / 2;
if (cmdr.fuel > myship.max_fuel)
cmdr.fuel = myship.max_fuel;
info_message ("Fuel Scoop On");
}
/*
* Regenerate the shields and the energy banks.
*/
void regenerate_shields (void)
{
if (energy > 127)
{
if (front_shield < 255)
{
front_shield++;
energy--;
}
if (aft_shield < 255)
{
aft_shield++;
energy--;
}
}
energy++;
energy += cmdr.energy_unit;
if (energy > 255)
energy = 255;
}
void decrease_energy (int amount)
{
energy += amount;
if (energy <= 0)
do_game_over();
}
/*
* Deplete the shields. Drain the energy banks if the shields fail.
*/
void damage_ship (int damage, int front)
{
int shield;
if (damage <= 0) /* sanity check */
return;
shield = front ? front_shield : aft_shield;
shield -= damage;
if (shield < 0)
{
decrease_energy (shield);
shield = 0;
}
if (front)
front_shield = shield;
else
aft_shield = shield;
}
void make_station_appear (void)
{
double px,py,pz;
double sx,sy,sz;
Vector vec;
Matrix rotmat;
px = universe[0].location.x;
py = universe[0].location.y;
pz = universe[0].location.z;
vec.x = (rand() & 32767) - 16384;
vec.y = (rand() & 32767) - 16384;
vec.z = rand() & 32767;
vec = unit_vector (&vec);
sx = px - vec.x * 65792;
sy = py - vec.y * 65792;
sz = pz - vec.z * 65792;
// set_init_matrix (rotmat);
rotmat[0].x = 1.0;
rotmat[0].y = 0.0;
rotmat[0].z = 0.0;
rotmat[1].x = vec.x;
rotmat[1].y = vec.z;
rotmat[1].z = -vec.y;
rotmat[2].x = vec.x;
rotmat[2].y = vec.y;
rotmat[2].z = vec.z;
tidy_matrix (rotmat);
add_new_station (sx, sy, sz, rotmat);
}
void check_docking (int i)
{
if (is_docking(i))
{
snd_play_sample (SND_DOCK);
dock_player();
current_screen = SCR_BREAK_PATTERN;
return;
}
if (flight_speed >= 5)
{
do_game_over();
return;
}
flight_speed = 1;
damage_ship (5, universe[i].location.z > 0);
snd_play_sample (SND_CRASH);
}
void switch_to_view (struct univ_object *flip)
{
double tmp;
if ((current_screen == SCR_REAR_VIEW) ||
(current_screen == SCR_GAME_OVER))
{
flip->location.x = -flip->location.x;
flip->location.z = -flip->location.z;
flip->rotmat[0].x = -flip->rotmat[0].x;
flip->rotmat[0].z = -flip->rotmat[0].z;
flip->rotmat[1].x = -flip->rotmat[1].x;
flip->rotmat[1].z = -flip->rotmat[1].z;
flip->rotmat[2].x = -flip->rotmat[2].x;
flip->rotmat[2].z = -flip->rotmat[2].z;
return;
}
if (current_screen == SCR_LEFT_VIEW)
{
tmp = flip->location.x;
flip->location.x = flip->location.z;
flip->location.z = -tmp;
if (flip->type < 0)
return;
tmp = flip->rotmat[0].x;
flip->rotmat[0].x = flip->rotmat[0].z;
flip->rotmat[0].z = -tmp;
tmp = flip->rotmat[1].x;
flip->rotmat[1].x = flip->rotmat[1].z;
flip->rotmat[1].z = -tmp;
tmp = flip->rotmat[2].x;
flip->rotmat[2].x = flip->rotmat[2].z;
flip->rotmat[2].z = -tmp;
return;
}
if (current_screen == SCR_RIGHT_VIEW)
{
tmp = flip->location.x;
flip->location.x = -flip->location.z;
flip->location.z = tmp;
if (flip->type < 0)
return;
tmp = flip->rotmat[0].x;
flip->rotmat[0].x = -flip->rotmat[0].z;
flip->rotmat[0].z = tmp;
tmp = flip->rotmat[1].x;
flip->rotmat[1].x = -flip->rotmat[1].z;
flip->rotmat[1].z = tmp;
tmp = flip->rotmat[2].x;
flip->rotmat[2].x = -flip->rotmat[2].z;
flip->rotmat[2].z = tmp;
}
}
/*
* Update all the objects in the universe and render them.
*/
void update_universe (void)
{
int i;
int type;
int bounty;
char str[80];
struct univ_object flip;
gfx_start_render();
for (i = 0; i < MAX_UNIV_OBJECTS; i++)
{
type = universe[i].type;
if (type != 0)
{
if (universe[i].flags & FLG_REMOVE)
{
if (type == SHIP_VIPER)
cmdr.legal_status |= 64;
bounty = ship_list[type]->bounty;
if ((bounty != 0) && (!witchspace))
{
cmdr.credits += bounty;
sprintf (str, "%d.%d CR", cmdr.credits / 10, cmdr.credits % 10);
info_message (str);
}
remove_ship (i);
continue;
}
if ((detonate_bomb) && ((universe[i].flags & FLG_DEAD) == 0) &&
(type != SHIP_PLANET) && (type != SHIP_SUN) &&
(type != SHIP_CONSTRICTOR) && (type != SHIP_COUGAR) &&
(type != SHIP_CORIOLIS) && (type != SHIP_DODEC))
{
snd_play_sample (SND_EXPLODE);
universe[i].flags |= FLG_DEAD;
}
if ((current_screen != SCR_INTRO_ONE) &&
(current_screen != SCR_INTRO_TWO) &&
(current_screen != SCR_GAME_OVER) &&
(current_screen != SCR_ESCAPE_POD))
{
tactics (i);
}
move_univ_object (&universe[i]);
flip = universe[i];
switch_to_view (&flip);
if (type == SHIP_PLANET)
{
if ((ship_count[SHIP_CORIOLIS] == 0) &&
(ship_count[SHIP_DODEC] == 0) &&
(universe[i].distance < 65792)) // was 49152
{
make_station_appear();
}
draw_ship (&flip);
continue;
}
if (type == SHIP_SUN)
{
draw_ship (&flip);
continue;
}
if (universe[i].distance < 170)
{
if ((type == SHIP_CORIOLIS) || (type == SHIP_DODEC))
check_docking (i);
else
scoop_item(i);
continue;
}
if (universe[i].distance > 57344)
{
remove_ship (i);
continue;
}
draw_ship (&flip);
universe[i].flags = flip.flags;
universe[i].exp_seed = flip.exp_seed;
universe[i].exp_delta = flip.exp_delta;
universe[i].flags &= ~FLG_FIRING;
if (universe[i].flags & FLG_DEAD)
continue;
check_target (i, &flip);
}
}
gfx_finish_render();
detonate_bomb = 0;
}
/*
* Update the scanner and draw all the lollipops.
*/
void update_scanner (void)
{
int i;
int x,y,z;
int x1,y1,y2;
int colour;
for (i = 0; i < MAX_UNIV_OBJECTS; i++)
{
if ((universe[i].type <= 0) ||
(universe[i].flags & FLG_DEAD) ||
(universe[i].flags & FLG_CLOAKED))
continue;
x = universe[i].location.x / 256;
y = universe[i].location.y / 256;
z = universe[i].location.z / 256;
x1 = x;
y1 = -z / 4;
y2 = y1 - y / 2;
if ((y2 < -28) || (y2 > 28) ||
(x1 < -50) || (x1 > 50))
continue;
x1 += scanner_cx;
y1 += scanner_cy;
y2 += scanner_cy;
colour = (universe[i].flags & FLG_HOSTILE) ? GFX_COL_YELLOW_5 : GFX_COL_WHITE;
switch (universe[i].type)
{
case SHIP_MISSILE:
colour = 137;
break;
case SHIP_DODEC:
case SHIP_CORIOLIS:
colour = GFX_COL_GREEN_1;
break;
case SHIP_VIPER:
colour = 252;
break;
}
gfx_draw_colour_line (x1+2, y2, x1-3, y2, colour);
gfx_draw_colour_line (x1+2, y2+1, x1-3, y2+1, colour);
gfx_draw_colour_line (x1+2, y2+2, x1-3, y2+2, colour);
gfx_draw_colour_line (x1+2, y2+3, x1-3, y2+3, colour);
gfx_draw_colour_line (x1, y1, x1, y2, colour);
gfx_draw_colour_line (x1+1, y1, x1+1, y2, colour);
gfx_draw_colour_line (x1+2, y1, x1+2, y2, colour);
}
}
/*
* Update the compass which tracks the space station / planet.
*/
void update_compass (void)
{
struct vector dest;
int compass_x;
int compass_y;
int un = 0;
if (witchspace)
return;
if (ship_count[SHIP_CORIOLIS] || ship_count[SHIP_DODEC])
un = 1;
dest = unit_vector (&universe[un].location);
compass_x = compass_centre_x + (dest.x * 16);
compass_y = compass_centre_y + (dest.y * -16);
if (dest.z < 0)
{
gfx_draw_sprite (IMG_RED_DOT, compass_x, compass_y);
}
else
{
gfx_draw_sprite (IMG_GREEN_DOT, compass_x, compass_y);
}
}
/*
* Display the speed bar.
*/
void display_speed (void)
{
int sx,sy;
int i;
int len;
int colour;
sx = 417;
sy = 384 + 9;
len = ((flight_speed * 64) / myship.max_speed) - 1;
colour = (flight_speed > (myship.max_speed * 2 / 3)) ? GFX_COL_DARK_RED : GFX_COL_GOLD;
for (i = 0; i < 6; i++)
{
gfx_draw_colour_line (sx, sy + i, sx + len, sy + i, colour);
}
}
/*
* Draw an indicator bar.
* Used for shields and energy banks.
*/
void display_dial_bar (int len, int x, int y)
{
int i = 0;
gfx_draw_colour_line (x, y + 384, x + len, y + 384, GFX_COL_GOLD);
i++;
gfx_draw_colour_line (x, y + i + 384, x + len, y + i + 384, GFX_COL_GOLD);
for (i = 2; i < 7; i++)
gfx_draw_colour_line (x, y + i + 384, x + len, y + i + 384, GFX_COL_YELLOW_1);
gfx_draw_colour_line (x, y + i + 384, x + len, y + i + 384, GFX_COL_DARK_RED);
}
/*
* Display the current shield strengths.
*/
void display_shields (void)
{
if (front_shield > 3)
display_dial_bar (front_shield / 4, 31, 7);
if (aft_shield > 3)
display_dial_bar (aft_shield / 4, 31, 23);
}
void display_altitude (void)
{
if (myship.altitude > 3)
display_dial_bar (myship.altitude / 4, 31, 92);
}
void display_cabin_temp (void)
{
if (myship.cabtemp > 3)
display_dial_bar (myship.cabtemp / 4, 31, 60);
}
void display_laser_temp (void)
{
if (laser_temp > 0)
display_dial_bar (laser_temp / 4, 31, 76);
}
/*
* Display the energy banks.
*/
void display_energy (void)
{
int e1,e2,e3,e4;
e1 = energy > 64 ? 64 : energy;
e2 = energy > 128 ? 64 : energy - 64;
e3 = energy > 192 ? 64 : energy - 128;
e4 = energy - 192;
if (e4 > 0)
display_dial_bar (e4, 416, 61);
if (e3 > 0)
display_dial_bar (e3, 416, 79);
if (e2 > 0)
display_dial_bar (e2, 416, 97);
if (e1 > 0)
display_dial_bar (e1, 416, 115);
}
void display_flight_roll (void)
{
int sx,sy;
int i;
int pos;
sx = 416;
sy = 384 + 9 + 14;
pos = sx - ((flight_roll * 28) / myship.max_roll);
pos += 32;
for (i = 0; i < 4; i++)
{
gfx_draw_colour_line (pos + i, sy, pos + i, sy + 7, GFX_COL_GOLD);
}
}
void display_flight_climb (void)
{
int sx,sy;
int i;
int pos;
sx = 416;
sy = 384 + 9 + 14 + 16;
pos = sx + ((flight_climb * 28) / myship.max_climb);
pos += 32;
for (i = 0; i < 4; i++)
{
gfx_draw_colour_line (pos + i, sy, pos + i, sy + 7, GFX_COL_GOLD);
}
}
void display_fuel (void)
{
if (cmdr.fuel > 0)
display_dial_bar ((cmdr.fuel * 64) / myship.max_fuel, 31, 44);
}
void display_missiles (void)
{
int nomiss;
int x,y;
if (cmdr.missiles == 0)
return;
nomiss = cmdr.missiles > 4 ? 4 : cmdr.missiles;
x = (4 - nomiss) * 16 + 35;
y = 113 + 385;
if (missile_target != MISSILE_UNARMED)
{
gfx_draw_sprite ((missile_target < 0) ? IMG_MISSILE_YELLOW :
IMG_MISSILE_RED, x, y);
x += 16;
nomiss--;
}
for (; nomiss > 0; nomiss--)
{
gfx_draw_sprite (IMG_MISSILE_GREEN, x, y);
x += 16;
}
}
void update_console (void)
{
gfx_set_clip_region (0, 0, 512, 512);
gfx_draw_scanner();
display_speed();
display_flight_climb();
display_flight_roll();
display_shields();
display_altitude();
display_energy();
display_cabin_temp();
display_laser_temp();
display_fuel();
display_missiles();
if (docked)
return;
update_scanner();
update_compass();
if (ship_count[SHIP_CORIOLIS] || ship_count[SHIP_DODEC])
gfx_draw_sprite (IMG_BIG_S, 387, 490);
if (ecm_active)
gfx_draw_sprite (IMG_BIG_E, 115, 490);
}
void increase_flight_roll (void)
{
if (flight_roll < myship.max_roll)
flight_roll++;
}