p_pspr.c

DOOM游戏的源码,研究DOS下游戏设计

//
// A_GunFlash
//
void
A_GunFlash
( player_t*	player,
  pspdef_t*	psp ) 
{
    P_SetMobjState (player->mo, S_PLAY_ATK2);
    P_SetPsprite (player,ps_flash,weaponinfo[player->readyweapon].flashstate);
}



//
// WEAPON ATTACKS
//


//
// A_Punch
//
void
A_Punch
( player_t*	player,
  pspdef_t*	psp ) 
{
    angle_t	angle;
    int		damage;
    int		slope;
	
    damage = (P_Random ()%10+1)<<1;

    if (player->powers[pw_strength])	
	damage *= 10;

    angle = player->mo->angle;
    angle += (P_Random()-P_Random())<<18;
    slope = P_AimLineAttack (player->mo, angle, MELEERANGE);
    P_LineAttack (player->mo, angle, MELEERANGE, slope, damage);

    // turn to face target
    if (linetarget)
    {
	S_StartSound (player->mo, sfx_punch);
	player->mo->angle = R_PointToAngle2 (player->mo->x,
					     player->mo->y,
					     linetarget->x,
					     linetarget->y);
    }
}


//
// A_Saw
//
void
A_Saw
( player_t*	player,
  pspdef_t*	psp ) 
{
    angle_t	angle;
    int		damage;
    int		slope;

    damage = 2*(P_Random ()%10+1);
    angle = player->mo->angle;
    angle += (P_Random()-P_Random())<<18;
    
    // use meleerange + 1 se the puff doesn't skip the flash
    slope = P_AimLineAttack (player->mo, angle, MELEERANGE+1);
    P_LineAttack (player->mo, angle, MELEERANGE+1, slope, damage);

    if (!linetarget)
    {
	S_StartSound (player->mo, sfx_sawful);
	return;
    }
    S_StartSound (player->mo, sfx_sawhit);
	
    // turn to face target
    angle = R_PointToAngle2 (player->mo->x, player->mo->y,
			     linetarget->x, linetarget->y);
    if (angle - player->mo->angle > ANG180)
    {
	if (angle - player->mo->angle < -ANG90/20)
	    player->mo->angle = angle + ANG90/21;
	else
	    player->mo->angle -= ANG90/20;
    }
    else
    {
	if (angle - player->mo->angle > ANG90/20)
	    player->mo->angle = angle - ANG90/21;
	else
	    player->mo->angle += ANG90/20;
    }
    player->mo->flags |= MF_JUSTATTACKED;
}



//
// A_FireMissile
//
void
A_FireMissile
( player_t*	player,
  pspdef_t*	psp ) 
{
    player->ammo[weaponinfo[player->readyweapon].ammo]--;
    P_SpawnPlayerMissile (player->mo, MT_ROCKET);
}


//
// A_FireBFG
//
void
A_FireBFG
( player_t*	player,
  pspdef_t*	psp ) 
{
    player->ammo[weaponinfo[player->readyweapon].ammo] -= BFGCELLS;
    P_SpawnPlayerMissile (player->mo, MT_BFG);
}



//
// A_FirePlasma
//
void
A_FirePlasma
( player_t*	player,
  pspdef_t*	psp ) 
{
    player->ammo[weaponinfo[player->readyweapon].ammo]--;

    P_SetPsprite (player,
		  ps_flash,
		  weaponinfo[player->readyweapon].flashstate+(P_Random ()&1) );

    P_SpawnPlayerMissile (player->mo, MT_PLASMA);
}



//
// P_BulletSlope
// Sets a slope so a near miss is at aproximately
// the height of the intended target
//
fixed_t		bulletslope;


void P_BulletSlope (mobj_t*	mo)
{
    angle_t	an;
    
    // see which target is to be aimed at
    an = mo->angle;
    bulletslope = P_AimLineAttack (mo, an, 16*64*FRACUNIT);

    if (!linetarget)
    {
	an += 1<<26;
	bulletslope = P_AimLineAttack (mo, an, 16*64*FRACUNIT);
	if (!linetarget)
	{
	    an -= 2<<26;
	    bulletslope = P_AimLineAttack (mo, an, 16*64*FRACUNIT);
	}
    }
}


//
// P_GunShot
//
void
P_GunShot
( mobj_t*	mo,
  boolean	accurate )
{
    angle_t	angle;
    int		damage;
	
    damage = 5*(P_Random ()%3+1);
    angle = mo->angle;

    if (!accurate)
	angle += (P_Random()-P_Random())<<18;

    P_LineAttack (mo, angle, MISSILERANGE, bulletslope, damage);
}


//
// A_FirePistol
//
void
A_FirePistol
( player_t*	player,
  pspdef_t*	psp ) 
{
    S_StartSound (player->mo, sfx_pistol);

    P_SetMobjState (player->mo, S_PLAY_ATK2);
    player->ammo[weaponinfo[player->readyweapon].ammo]--;

    P_SetPsprite (player,
		  ps_flash,
		  weaponinfo[player->readyweapon].flashstate);

    P_BulletSlope (player->mo);
    P_GunShot (player->mo, !player->refire);
}


//
// A_FireShotgun
//
void
A_FireShotgun
( player_t*	player,
  pspdef_t*	psp ) 
{
    int		i;
	
    S_StartSound (player->mo, sfx_shotgn);
    P_SetMobjState (player->mo, S_PLAY_ATK2);

    player->ammo[weaponinfo[player->readyweapon].ammo]--;

    P_SetPsprite (player,
		  ps_flash,
		  weaponinfo[player->readyweapon].flashstate);

    P_BulletSlope (player->mo);
	
    for (i=0 ; i<7 ; i++)
	P_GunShot (player->mo, false);
}



//
// A_FireShotgun2
//
void
A_FireShotgun2
( player_t*	player,
  pspdef_t*	psp ) 
{
    int		i;
    angle_t	angle;
    int		damage;
		
	
    S_StartSound (player->mo, sfx_dshtgn);
    P_SetMobjState (player->mo, S_PLAY_ATK2);

    player->ammo[weaponinfo[player->readyweapon].ammo]-=2;

    P_SetPsprite (player,
		  ps_flash,
		  weaponinfo[player->readyweapon].flashstate);

    P_BulletSlope (player->mo);
	
    for (i=0 ; i<20 ; i++)
    {
	damage = 5*(P_Random ()%3+1);
	angle = player->mo->angle;
	angle += (P_Random()-P_Random())<<19;
	P_LineAttack (player->mo,
		      angle,
		      MISSILERANGE,
		      bulletslope + ((P_Random()-P_Random())<<5), damage);
    }
}


//
// A_FireCGun
//
void
A_FireCGun
( player_t*	player,
  pspdef_t*	psp ) 
{
    S_StartSound (player->mo, sfx_pistol);

    if (!player->ammo[weaponinfo[player->readyweapon].ammo])
	return;
		
    P_SetMobjState (player->mo, S_PLAY_ATK2);
    player->ammo[weaponinfo[player->readyweapon].ammo]--;

    P_SetPsprite (player,
		  ps_flash,
		  weaponinfo[player->readyweapon].flashstate
		  + psp->state
		  - &states[S_CHAIN1] );

    P_BulletSlope (player->mo);
	
    P_GunShot (player->mo, !player->refire);
}



//
// ?
//
void A_Light0 (player_t *player, pspdef_t *psp)
{
    player->extralight = 0;
}

void A_Light1 (player_t *player, pspdef_t *psp)
{
    player->extralight = 1;
}

void A_Light2 (player_t *player, pspdef_t *psp)
{
    player->extralight = 2;
}


//
// A_BFGSpray
// Spawn a BFG explosion on every monster in view
//
void A_BFGSpray (mobj_t* mo) 
{
    int			i;
    int			j;
    int			damage;
    angle_t		an;
	
    // offset angles from its attack angle
    for (i=0 ; i<40 ; i++)
    {
	an = mo->angle - ANG90/2 + ANG90/40*i;

	// mo->target is the originator (player)
	//  of the missile
	P_AimLineAttack (mo->target, an, 16*64*FRACUNIT);

	if (!linetarget)
	    continue;

	P_SpawnMobj (linetarget->x,
		     linetarget->y,
		     linetarget->z + (linetarget->height>>2),
		     MT_EXTRABFG);
	
	damage = 0;
	for (j=0;j<15;j++)
	    damage += (P_Random()&7) + 1;

	P_DamageMobj (linetarget, mo->target,mo->target, damage);
    }
}


//
// A_BFGsound
//
void
A_BFGsound
( player_t*	player,
  pspdef_t*	psp )
{
    S_StartSound (player->mo, sfx_bfg);
}



//
// P_SetupPsprites
// Called at start of level for each player.
//
void P_SetupPsprites (player_t* player) 
{
    int	i;
	
    // remove all psprites
    for (i=0 ; i<NUMPSPRITES ; i++)
	player->psprites[i].state = NULL;
		
    // spawn the gun
    player->pendingweapon = player->readyweapon;
    P_BringUpWeapon (player);
}




//
// P_MovePsprites
// Called every tic by player thinking routine.
//
void P_MovePsprites (player_t* player) 
{
    int		i;
    pspdef_t*	psp;
    state_t*	state;
	
    psp = &player->psprites[0];
    for (i=0 ; i<NUMPSPRITES ; i++, psp++)
    {
	// a null state means not active
	if ( (state = psp->state) )	
	{
	    // drop tic count and possibly change state

	    // a -1 tic count never changes
	    if (psp->tics != -1)	
	    {
		psp->tics--;
		if (!psp->tics)
		    P_SetPsprite (player, i, psp->state->nextstate);
	    }				
	}
    }
    
    player->psprites[ps_flash].sx = player->psprites[ps_weapon].sx;
    player->psprites[ps_flash].sy = player->psprites[ps_weapon].sy;
}