cmeasure.cpp

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/*
 * Copyright (C) Volition, Inc. 1999.  All rights reserved.
 *
 * All source code herein is the property of Volition, Inc. You may not sell 
 * or otherwise commercially exploit the source or things you created based on the 
 * source.
 *
*/ 



#include "cmeasure/cmeasure.h"
#include "gamesnd/gamesnd.h"
#include "hud/hud.h"
#include "math/staticrand.h"
#include "mission/missionparse.h"
#include "network/multimsgs.h"
#include "object/object.h"
#include "ship/ship.h"
#include "weapon/weapon.h"

int     Cmeasures_homing_check = 0;
int     Countermeasures_enabled = 1;                    //      Debug, set to 0 means no one can fire countermeasures.
const float CMEASURE_DETONATE_DISTANCE = 40.0f;

//Used to set a countermeasure velocity after being launched from a ship as a countermeasure
//ie not as a primary or secondary.
void cmeasure_set_ship_launch_vel(object *objp, object *parent_objp, int arand)
{
        vec3d vel, rand_vec;

        //Get cmeasure rear velocity in world
        vm_vec_scale_add(&vel, &parent_objp->phys_info.vel, &parent_objp->orient.vec.fvec, -25.0f);

        //Get random velocity vector
        static_randvec(arand+1, &rand_vec);

        //Add it to the rear velocity
        vm_vec_scale_add2(&vel, &rand_vec, 2.0f);

        objp->phys_info.vel = vel;

        //Zero out this stuff so it isn't moving
        vm_vec_zero(&objp->phys_info.rotvel);
        vm_vec_zero(&objp->phys_info.max_vel);
        vm_vec_zero(&objp->phys_info.max_rotvel);
        
        // blow out his reverse thrusters. Or drag, same thing.
        objp->phys_info.rotdamp = 10000.0f;
        objp->phys_info.side_slip_time_const = 10000.0f;

        objp->phys_info.max_vel.xyz.z = -25.0f;
        vm_vec_copy_scale(&objp->phys_info.desired_vel, &objp->orient.vec.fvec, objp->phys_info.max_vel.xyz.z );
}

void cmeasure_select_next(ship *shipp)
{
        Assert(shipp != NULL);
        int i, new_index;

        for (i = 1; i < Num_weapon_types; i++)
        {
                new_index = (shipp->current_cmeasure + i) % Num_weapon_types;

                if(Weapon_info[new_index].wi_flags & WIF_CMEASURE)
                {
                        shipp->current_cmeasure = new_index;
                        return;
                }
        }

        mprintf(("Countermeasure type set to %i in frame %i\n", shipp->current_cmeasure, Framecount));
}


void cmeasure_maybe_alert_success(object *objp)
{
        //Is this a countermeasure, and does it have a parent
        if ( objp->type != OBJ_WEAPON || objp->parent < 0) {
                return;
        }

        Assert(Weapon_info[Weapons[objp->instance].weapon_info_index].wi_flags & WIF_CMEASURE);

        if ( objp->parent == OBJ_INDEX(Player_obj) ) {
                hud_start_text_flash(XSTR("Evaded", 1430), 800);
                snd_play(&Snds[ship_get_sound(Player_obj, SND_MISSILE_EVADED_POPUP)]);
        } else if ( Objects[objp->parent].flags & OF_PLAYER_SHIP ) {
                send_countermeasure_success_packet( objp->parent );
        }
}