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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "BombDropper.h"
#include "WeaponDef.h"
#include "Game/GameHelper.h"
#include "Sim/Misc/GlobalSynced.h"
#include "Sim/Misc/Team.h"
#include "Map/MapInfo.h"
#include "Sim/Projectiles/WeaponProjectiles/WeaponProjectileFactory.h"
#include "Sim/Units/Unit.h"
#include "Sim/Units/UnitDef.h"
#include "System/myMath.h"
CR_BIND_DERIVED(CBombDropper, CWeapon, (NULL, NULL, false))
CR_REG_METADATA(CBombDropper,(
CR_MEMBER(dropTorpedoes),
CR_MEMBER(torpMoveRange),
CR_MEMBER(tracking),
CR_RESERVED(16)
))
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CBombDropper::CBombDropper(CUnit* owner, const WeaponDef* def, bool useTorps)
: CWeapon(owner, def)
, dropTorpedoes(useTorps)
, torpMoveRange(def->range * useTorps)
, tracking((def->tracks)? def->turnrate: 0)
{
onlyForward = true;
}
void CBombDropper::Init()
{
CWeapon::Init();
maxForwardAngleDif = -1.0f;
}
void CBombDropper::Update()
{
if (targetType != Target_None) {
weaponPos = owner->GetObjectSpacePos(relWeaponPos);
if (targetType == Target_Unit) {
// aim at base of unit instead of middle and ignore uncertainty
targetPos = targetUnit->pos;
}
predict = GetPredictedImpactTime(targetPos);
}
CWeapon::Update();
}
bool CBombDropper::TestTarget(const float3& pos, bool userTarget, const CUnit* unit) const
{
// assume we can still drop bombs on *partially* submerged targets
if (!dropTorpedoes && TargetUnitOrPositionUnderWater(pos, unit))
return false;
// assume we can drop torpedoes on any partially or fully submerged target
if (dropTorpedoes && !TargetUnitOrPositionInWater(pos, unit))
return false;
return CWeapon::TestTarget(pos, userTarget, unit);
}
bool CBombDropper::HaveFreeLineOfFire(const float3& pos, bool userTarget, const CUnit* unit) const
{
// TODO: requires sampling parabola from weaponPos down to dropPos
return true;
}
#if 0
bool CBombDropper::CanFire(bool ignoreAngleGood, bool ignoreTargetType, bool ignoreRequestedDir) const
{
return (CWeapon::CanFire(true, ignoreTargetType, true));
}
bool CBombDropper::TestRange(const float3& pos, bool userTarget, const CUnit* unit) const
{
#else
bool CBombDropper::TestRange(const float3& pos, bool userTarget, const CUnit* unit) const { return true; }
bool CBombDropper::CanFire(bool ignoreAngleGood, bool ignoreTargetType, bool ignoreRequestedDir) const
{
// we mostly ignore what AimWeapon has to say
if (!CWeapon::CanFire(true, ignoreTargetType, true))
return false;
#endif
// bombs always fall down
if (weaponPos.y <= targetPos.y)
return false;
// "normal" range restrictions are not meaningful
// to check given dropped (ballistic) projectiles
if (false && (owner->speed.w * predict) > weaponDef->range)
return false;
// dropPos is guaranteed to be in range from owner's
// current position, now must make sure no bombs will
// under- (eg. if range is much larger than <v*t>) or
// overshoot (eg. if salvoDelay is long) their actual
// targetPos too much
// torpedoes especially should not be dropped if the
// target position is already behind owner's position
const float3 dropPos = owner->pos + owner->speed * predict;
// salvoSize * salvoDelay is time to drop entire salvo
// size*delay * speed is distance from dropPos of first
// bomb to dropPos of last (assuming no spread), we use
// half this distance as tolerance radius
const float dropDist = std::max(1, salvoSize) * (salvoDelay * owner->speed.w * 0.5f);
const float torpDist = torpMoveRange * (owner->frontdir.dot(targetPos - owner->pos) > 0.0f);
return (dropPos.SqDistance2D(targetPos) < Square(dropDist + torpDist));
}
void CBombDropper::FireImpl(bool scriptCall)
{
if (targetType == Target_Unit) {
// aim at base of unit instead of middle and ignore uncertainity
targetPos = targetUnit->pos;
}
if (dropTorpedoes) {
float3 launchSpeed = owner->speed;
// if owner is a hovering aircraft, use a fixed launching speed [?? WTF]
if (owner->unitDef->IsHoveringAirUnit()) {
launchSpeed = (targetPos - weaponPos).Normalize() * 5.0f;
}
ProjectileParams params = GetProjectileParams();
params.pos = weaponPos;
params.end = targetPos;
params.speed = launchSpeed;
params.ttl = (weaponDef->flighttime == 0)? ((range / projectileSpeed) + 15 + predict): weaponDef->flighttime;
params.tracking = tracking;
assert(weaponDef->projectileType == WEAPON_TORPEDO_PROJECTILE);
WeaponProjectileFactory::LoadProjectile(params);
} else {
// fudge a bit better lateral aim to compensate for imprecise aircraft steering
float3 dif = (targetPos - weaponPos) * XZVector;
float3 dir = owner->speed;
dir = dir.SafeNormalize();
// add a random spray
dir += (gs->randVector() * SprayAngleExperience() + SalvoErrorExperience());
dir.y = std::min(0.0f, dir.y);
dir = dir.SafeNormalize();
dif -= (dir * dif.dot(dir));
dif /= std::max(0.01f, predict);
if (dif.SqLength() > 1.0f) {
dif /= dif.Length();
}
ProjectileParams params = GetProjectileParams();
params.pos = weaponPos;
params.speed = owner->speed + dif;
params.ttl = 1000;
params.gravity = (weaponDef->myGravity == 0)? mapInfo->map.gravity: -weaponDef->myGravity;
assert(weaponDef->projectileType == WEAPON_EXPLOSIVE_PROJECTILE);
WeaponProjectileFactory::LoadProjectile(params);
}
}
/**
* pass true for noAutoTargetOverride to make sure this weapon
* does not generate its own targets (to save CPU mostly), only
* allow user- or CAI-picked units (the latter for fight orders)
*/
void CBombDropper::SlowUpdate()
{
CWeapon::SlowUpdate(true);
}
float CBombDropper::GetPredictedImpactTime(const float3& impactPos) const
{
if (weaponPos.y <= impactPos.y)
return 0.0f;
// weapon needs <t> frames to drop a distance
// <d> (if it has zero vertical speed), where:
// <d> = 0.5 * g * t*t = weaponPos.y - impactPos.y
// <t> = sqrt(d / (0.5 * g))
// bombs will travel <v * t> elmos horizontally
// which must be less than weapon's range to be
// able to hit, otherwise will always overshoot
const float d = impactPos.y - weaponPos.y;
const float s = -owner->speed.y;
const float g = mix(mapInfo->map.gravity, -weaponDef->myGravity, (weaponDef->myGravity != 0.0f));
const float tt = (s - 2.0f * d) / -g;
return ((tt >= 0.0f)? ((s / g) + math::sqrt(tt)): 0.0f);
}
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