p_inter.c

DOOM游戏的源码,研究DOS下游戏设计

// Emacs style mode select   -*- C++ -*- 
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// $Log:$
//
// DESCRIPTION:
//	Handling interactions (i.e., collisions).
//
//-----------------------------------------------------------------------------


static const char
rcsid[] = "$Id: p_inter.c,v 1.4 1997/02/03 22:45:11 b1 Exp $";


// Data.
#include "doomdef.h"
#include "dstrings.h"
#include "sounds.h"

#include "doomstat.h"

#include "m_random.h"
#include "i_system.h"

#include "am_map.h"

#include "p_local.h"

#include "s_sound.h"

#ifdef __GNUG__
#pragma implementation "p_inter.h"
#endif
#include "p_inter.h"


#define BONUSADD	6




// a weapon is found with two clip loads,
// a big item has five clip loads
int	maxammo[NUMAMMO] = {200, 50, 300, 50};
int	clipammo[NUMAMMO] = {10, 4, 20, 1};


//
// GET STUFF
//

//
// P_GiveAmmo
// Num is the number of clip loads,
// not the individual count (0= 1/2 clip).
// Returns false if the ammo can't be picked up at all
//

boolean
P_GiveAmmo
( player_t*	player,
  ammotype_t	ammo,
  int		num )
{
    int		oldammo;
	
    if (ammo == am_noammo)
	return false;
		
    if (ammo < 0 || ammo > NUMAMMO)
	I_Error ("P_GiveAmmo: bad type %i", ammo);
		
    if ( player->ammo[ammo] == player->maxammo[ammo]  )
	return false;
		
    if (num)
	num *= clipammo[ammo];
    else
	num = clipammo[ammo]/2;
    
    if (gameskill == sk_baby
	|| gameskill == sk_nightmare)
    {
	// give double ammo in trainer mode,
	// you'll need in nightmare
	num <<= 1;
    }
    
		
    oldammo = player->ammo[ammo];
    player->ammo[ammo] += num;

    if (player->ammo[ammo] > player->maxammo[ammo])
	player->ammo[ammo] = player->maxammo[ammo];

    // If non zero ammo, 
    // don't change up weapons,
    // player was lower on purpose.
    if (oldammo)
	return true;	

    // We were down to zero,
    // so select a new weapon.
    // Preferences are not user selectable.
    switch (ammo)
    {
      case am_clip:
	if (player->readyweapon == wp_fist)
	{
	    if (player->weaponowned[wp_chaingun])
		player->pendingweapon = wp_chaingun;
	    else
		player->pendingweapon = wp_pistol;
	}
	break;
	
      case am_shell:
	if (player->readyweapon == wp_fist
	    || player->readyweapon == wp_pistol)
	{
	    if (player->weaponowned[wp_shotgun])
		player->pendingweapon = wp_shotgun;
	}
	break;
	
      case am_cell:
	if (player->readyweapon == wp_fist
	    || player->readyweapon == wp_pistol)
	{
	    if (player->weaponowned[wp_plasma])
		player->pendingweapon = wp_plasma;
	}
	break;
	
      case am_misl:
	if (player->readyweapon == wp_fist)
	{
	    if (player->weaponowned[wp_missile])
		player->pendingweapon = wp_missile;
	}
      default:
	break;
    }
	
    return true;
}


//
// P_GiveWeapon
// The weapon name may have a MF_DROPPED flag ored in.
//
boolean
P_GiveWeapon
( player_t*	player,
  weapontype_t	weapon,
  boolean	dropped )
{
    boolean	gaveammo;
    boolean	gaveweapon;
	
    if (netgame
	&& (deathmatch!=2)
	 && !dropped )
    {
	// leave placed weapons forever on net games
	if (player->weaponowned[weapon])
	    return false;

	player->bonuscount += BONUSADD;
	player->weaponowned[weapon] = true;

	if (deathmatch)
	    P_GiveAmmo (player, weaponinfo[weapon].ammo, 5);
	else
	    P_GiveAmmo (player, weaponinfo[weapon].ammo, 2);
	player->pendingweapon = weapon;

	if (player == &players[consoleplayer])
	    S_StartSound (NULL, sfx_wpnup);
	return false;
    }
	
    if (weaponinfo[weapon].ammo != am_noammo)
    {
	// give one clip with a dropped weapon,
	// two clips with a found weapon
	if (dropped)
	    gaveammo = P_GiveAmmo (player, weaponinfo[weapon].ammo, 1);
	else
	    gaveammo = P_GiveAmmo (player, weaponinfo[weapon].ammo, 2);
    }
    else
	gaveammo = false;
	
    if (player->weaponowned[weapon])
	gaveweapon = false;
    else
    {
	gaveweapon = true;
	player->weaponowned[weapon] = true;
	player->pendingweapon = weapon;
    }
	
    return (gaveweapon || gaveammo);
}

 

//
// P_GiveBody
// Returns false if the body isn't needed at all
//
boolean
P_GiveBody
( player_t*	player,
  int		num )
{
    if (player->health >= MAXHEALTH)
	return false;
		
    player->health += num;
    if (player->health > MAXHEALTH)
	player->health = MAXHEALTH;
    player->mo->health = player->health;
	
    return true;
}



//
// P_GiveArmor
// Returns false if the armor is worse
// than the current armor.
//
boolean
P_GiveArmor
( player_t*	player,
  int		armortype )
{
    int		hits;
	
    hits = armortype*100;
    if (player->armorpoints >= hits)
	return false;	// don't pick up
		
    player->armortype = armortype;
    player->armorpoints = hits;
	
    return true;
}



//
// P_GiveCard
//
void
P_GiveCard
( player_t*	player,
  card_t	card )
{
    if (player->cards[card])
	return;
    
    player->bonuscount = BONUSADD;
    player->cards[card] = 1;
}


//
// P_GivePower
//
boolean
P_GivePower
( player_t*	player,
  int /*powertype_t*/	power )
{
    if (power == pw_invulnerability)
    {
	player->powers[power] = INVULNTICS;
	return true;
    }
    
    if (power == pw_invisibility)
    {
	player->powers[power] = INVISTICS;
	player->mo->flags |= MF_SHADOW;
	return true;
    }
    
    if (power == pw_infrared)
    {
	player->powers[power] = INFRATICS;
	return true;
    }
    
    if (power == pw_ironfeet)
    {
	player->powers[power] = IRONTICS;
	return true;
    }
    
    if (power == pw_strength)
    {
	P_GiveBody (player, 100);
	player->powers[power] = 1;
	return true;
    }
	
    if (player->powers[power])
	return false;	// already got it
		
    player->powers[power] = 1;
    return true;
}



//
// P_TouchSpecialThing
//
void
P_TouchSpecialThing
( mobj_t*	special,
  mobj_t*	toucher )
{
    player_t*	player;
    int		i;
    fixed_t	delta;
    int		sound;
		
    delta = special->z - toucher->z;

    if (delta > toucher->height
	|| delta < -8*FRACUNIT)
    {
	// out of reach
	return;
    }
    
	
    sound = sfx_itemup;	
    player = toucher->player;

    // Dead thing touching.
    // Can happen with a sliding player corpse.
    if (toucher->health <= 0)
	return;

    // Identify by sprite.
    switch (special->sprite)
    {
	// armor
      case SPR_ARM1:
	if (!P_GiveArmor (player, 1))
	    return;
	player->message = GOTARMOR;
	break;
		
      case SPR_ARM2:
	if (!P_GiveArmor (player, 2))
	    return;
	player->message = GOTMEGA;
	break;
	
	// bonus items
      case SPR_BON1:
	player->health++;		// can go over 100%
	if (player->health > 200)
	    player->health = 200;
	player->mo->health = player->health;
	player->message = GOTHTHBONUS;
	break;
	
      case SPR_BON2:
	player->armorpoints++;		// can go over 100%
	if (player->armorpoints > 200)
	    player->armorpoints = 200;
	if (!player->armortype)
	    player->armortype = 1;
	player->message = GOTARMBONUS;
	break;
	
      case SPR_SOUL:
	player->health += 100;
	if (player->health > 200)
	    player->health = 200;
	player->mo->health = player->health;
	player->message = GOTSUPER;
	sound = sfx_getpow;
	break;
	
      case SPR_MEGA:
	if (gamemode != commercial)
	    return;
	player->health = 200;
	player->mo->health = player->health;
	P_GiveArmor (player,2);
	player->message = GOTMSPHERE;
	sound = sfx_getpow;
	break;
	
	// cards
	// leave cards for everyone
      case SPR_BKEY:
	if (!player->cards[it_bluecard])
	    player->message = GOTBLUECARD;
	P_GiveCard (player, it_bluecard);
	if (!netgame)
	    break;
	return;
	
      case SPR_YKEY:
	if (!player->cards[it_yellowcard])
	    player->message = GOTYELWCARD;
	P_GiveCard (player, it_yellowcard);
	if (!netgame)
	    break;
	return;
	
      case SPR_RKEY:
	if (!player->cards[it_redcard])
	    player->message = GOTREDCARD;
	P_GiveCard (player, it_redcard);
	if (!netgame)
	    break;
	return;
	
      case SPR_BSKU:
	if (!player->cards[it_blueskull])
	    player->message = GOTBLUESKUL;
	P_GiveCard (player, it_blueskull);
	if (!netgame)
	    break;
	return;
	
      case SPR_YSKU:
	if (!player->cards[it_yellowskull])
	    player->message = GOTYELWSKUL;
	P_GiveCard (player, it_yellowskull);
	if (!netgame)
	    break;
	return;