g_combat.pas

雷神之锤2(Quake2)Delphi源码

unit g_combat;

(*
Copyright (C) 1997-2001 Id Software, Inc.

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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*)
// g_combat.c

// TODO:  #include "g_local.h"



{ NOTES (For Scott):
  ==================
  - Review this code and assure we have not missed some Assignments in IF
    statements, and accidentally interpretted them as Comparasons }



interface



function CanDamage(targ, inflictor: Pedict_t): qboolean;
procedure Killed(targ, inflictor, attacker: Pedict_t; damage: Integer; point: vec3_t);
procedure SpawnDamage(dmgtype: Integer; origin, normal: vec3_t; damage: Integer);
procedure M_ReactToDamage(targ, attacker: Pedict_t);
function CheckTeamDamage(targ, attacker: Pedict_t): qboolean;
procedure T_Damage(targ, inflictor, attacker: Pedict_t; dir, point, normal: vec3_t; damage, knockback, dflags, mofd: Integer);
procedure T_RadiusDamage(inflictor, attacker: Pedict_t; damage: float; ignore: Pedict_t; radius: float; mofd: Integer);



implementation



(* ============
CanDamage

Returns true if the inflictor can directly damage the target.  Used for
explosions and melee attacks.
============ *)
function CanDamage(targ, inflictor: Pedict_t): qboolean;
var
  dest: vec3_t;
  trace: trace_t;
begin
{ Following line originally commented out }
// bmodels need special checking because their origin is 0,0,0
  if (targ^.movetype = MOVETYPE_PUSH) then
  begin
    VectorAdd(targ^.absmin, targ^.absmax, dest);
    VectorScale(dest, 0.5, dest);
    trace := gi.trace(inflictor^.s.origin, vec3_origin, vec3_origin, dest, inflictor, MASK_SOLID);

    if (trace.fraction = 1.0) then
    begin
      Result := True;
      Exit;
    end;

    if (trace.ent = targ) then
    begin
      Result := True;
      Exit;
    end;

    Result := False;
    Exit;
  end;

  trace := gi.trace (inflictor^.s.origin, vec3_origin, vec3_origin, targ^.s.origin, inflictor, MASK_SOLID);
  if (trace.fraction = 1.0) then
  begin
    Result := True;
    Exit;
  end;

  VectorCopy(targ^.s.origin, dest);
  dest[0] := dest[0] + 15.0;
  dest[1] := dest[1] + 15.0;
  trace := gi.trace(inflictor^.s.origin, vec3_origin, vec3_origin, dest, inflictor, MASK_SOLID);
  if (trace.fraction = 1.0) then
  begin
    Result := True;
    Exit;
  end;

  VectorCopy(targ^.s.origin, dest);
  dest[0] := dest[0] + 15.0;
  dest[1] := dest[1] - 15.0;
  trace := gi.trace(inflictor^.s.origin, vec3_origin, vec3_origin, dest, inflictor, MASK_SOLID);
  if (trace.fraction = 1.0) then
  begin
    Result := True;
    Exit;
  end;

  VectorCopy(targ^.s.origin, dest);
  dest[0] := dest[0] - 15.0;
  dest[1] := dest[1] + 15.0;
  trace := gi.trace(inflictor^.s.origin, vec3_origin, vec3_origin, dest, inflictor, MASK_SOLID);
  if (trace.fraction = 1.0) then
  begin
    Result := True;
    Exit;
  end;

  VectorCopy(targ^.s.origin, dest);
  dest[0] := dest[0] - 15.0;
  dest[1] := dest[1] - 15.0;
  trace := gi.trace(inflictor^.s.origin, vec3_origin, vec3_origin, dest, inflictor, MASK_SOLID);
  if (trace.fraction = 1.0) then
  begin
    Result := True;
    Exit;
  end;

  Result := False;
end;

(* ============
Killed
============ *)
procedure Killed(targ, inflictor, attacker: Pedict_t; damage: Integer; point: vec3_t);
begin
  if (targ^.health < -999) then
    targ^.health := -999;

  targ^.enemy := attacker;

  if (((targ^.svflags AND SVF_MONSTER) <> 0) AND (targ^.deadflag <> DEAD_DEAD)) then
  begin
{ Following line originally commented out }
//		targ->svflags |= SVF_DEADMONSTER;	// now treat as a different content type
    if ((targ^.monsterinfo.aiflags AND AI_GOOD_GUY) = 0) then
    begin
      Inc(level.killed_monsters);
      if (coop^.value AND attacker^.client) then
        Inc(attacker^.client^.resp.score);
      // medics won't heal monsters that they kill themselves
      if (strcmp(attacker^.classname, 'monster_medic') = 0) then
        targ^.owner := attacker;
    end;
  end;

  if ((targ^.movetype = MOVETYPE_PUSH) OR (targ^.movetype = MOVETYPE_STOP) OR (targ^.movetype = MOVETYPE_NONE)) then
  begin	// doors, triggers, etc
    targ^.die(targ, inflictor, attacker, damage, point);
    Exit;
  end;

  if (((targ^.svflags AND SVF_MONSTER) <> 0) AND (targ^.deadflag <> DEAD_DEAD)) then
  begin
    targ^.touch := Nil;
    monster_death_use(targ);
  end;

  targ^.die(targ, inflictor, attacker, damage, point);
end;

(* ================
SpawnDamage
================ *)
procedure SpawnDamage(dmgtype: Integer; origin, normal: vec3_t; damage: Integer);
begin
  if (damage > 255) then
    damage := 255;
  gi.WriteByte(svc_temp_entity);
  gi.WriteByte(dmgtype);
{ Following line originally commented out }
//	gi.WriteByte (damage);
  gi.WritePosition(origin);
  gi.WriteDir(normal);
  gi.multicast(origin, MULTICAST_PVS);
end;

{ This Routine is only visible in-side this unit }
(* ============
T_Damage

targ		entity that is being damaged
inflictor	entity that is causing the damage
attacker	entity that caused the inflictor to damage targ
	example: targ=monster, inflictor=rocket, attacker=player

dir			direction of the attack
point		point at which the damage is being inflicted
normal		normal vector from that point
damage		amount of damage being inflicted
knockback	force to be applied against targ as a result of the damage

dflags		these flags are used to control how T_Damage works
	DAMAGE_RADIUS			damage was indirect (from a nearby explosion)
	DAMAGE_NO_ARMOR			armor does not protect from this damage
	DAMAGE_ENERGY			damage is from an energy based weapon
	DAMAGE_NO_KNOCKBACK		do not affect velocity, just view angles
	DAMAGE_BULLET			damage is from a bullet (used for ricochets)
	DAMAGE_NO_PROTECTION	kills godmode, armor, everything
============ *)
function CheckPowerArmor(ent: Pedict_t; point, normal: vec3_t; damage, dflags: Integer): Integer;
var
  client: Pgclient_t;
  save, power_armor_type, index, damagePerCell, pa_te_type, power, power_used: Integer;
  vec, forwards: vec3_t;
  dot: float;
begin
  if (damage = 0) then
  begin
    Result := 0;
    Exit;
  end;

  client := ent^.client;

  if (dflags AND DAMAGE_NO_ARMOR) <> 0 then
  begin
    Result := 0;
    Exit;
  end;

  if (client <> Nil) then
  begin
    power_armor_type := PowerArmorType(ent);
    if (power_armor_type <> POWER_ARMOR_NONE) then
    begin
      index := ITEM_INDEX(FindItem('Cells'));
      power := client^.pers.inventory[index];
    end
  end
  else if (ent^.svflags AND SVF_MONSTER) <> 0 then
  begin
    power_armor_type := ent^.monsterinfo.power_armor_type;
    power := ent^.monsterinfo.power_armor_power;
  end
  else
  begin
    Result := 0;
    Exit;
  end;

  if (power_armor_type = POWER_ARMOR_NONE) then
  begin
    Result := 0;
    Exit;
  end;

  if (power = 0) then
  begin
    Result := 0;
    Exit;
  end;

  if (power_armor_type = POWER_ARMOR_SCREEN) then
  begin
    { The variable 'forward' has been renamed to 'forwards' }
    // only works if damage point is in front
    AngleVectors(ent^.s.angles, forwards, Nil, Nil);
    VectorSubtract(point, ent^.s.origin, vec);
    VectorNormalize(vec);
    dot := DotProduct(vec, forwards);
    if (dot <= 0.3) then
    begin
      Result := 0;
      Exit;
    end;

    damagePerCell := 1;
    pa_te_type := TE_SCREEN_SPARKS;
    { TODO:  The following commented line is a Delphi Safe alternative }
    //damage := damage div 3;
    damage := damage / 3;
  end
  else
  begin
    damagePerCell := 2;
    pa_te_type := TE_SHIELD_SPARKS;
    { TODO:  The following commented line is a Delphi Safe alternative }
    //damage := (2 * damage) div 3;
    damage := (2 * damage) / 3;
  end;

  save := power * damagePerCell;
  if (save = 0) then
  begin
    Result := 0;
    Exit;
  end;

  if (save > damage) then
    save := damage;

  SpawnDamage(pa_te_type, point, normal, save);
  ent^.powerarmor_time := level.time + 0.2;

  power_used := save / damagePerCell;

  if (client <> Nil) then
    client^.pers.inventory[index] := client^.pers.inventory[index] - power_used;
  else
    ent^.monsterinfo.power_armor_power := ent^.monsterinfo.power_armor_power - power_used;

  Result := save;
end;

{ This Routine is only visible in-side this unit }
function CheckArmor(ent: Pedict_t; point, normal: vec3_t; damage, te_sparks, dflags: Integer): Integer;
var
  client: Pgclient_t;
  save, index: Integer;
  armor: Pgitem_t;
begin
  if (damage = 0) then
  begin
    Result := 0;
    Exit;
  end;

  client := ent^.client;

  if (client = Nil) then