ObjManager.cpp

#include "nx.h"
#include "common/llist.h"
#include "ObjManager.h"
#include "ObjManager.fdh"

static Object ZERO_OBJECT;
static Player ZERO_PLAYER;

Object *firstobject = NULL, *lastobject = NULL;
Object *lowestobject = NULL, *highestobject = NULL;

/*
void c------------------------------() {}
*/

Object *CreateObject(int x, int y, int type, int xinertia, int yinertia,
					int dir, Object *linkedobject, uint32_t createflags)
{
Object *o;

	// create the structure
	if (type != OBJ_PLAYER)
	{
		o = new Object;
		*o = ZERO_OBJECT;	// safely clears all members
	}
	else
	{
		Player *p = new Player;
		*p = ZERO_PLAYER;
		o = (Object *)p;
	}
	
	// initialize
	o->SetType(type);
	o->flags = objprop[type].defaultflags;
	o->DamageText = new FloatText(SPR_REDNUMBERS);
	
	o->x = x - (sprites[o->sprite].spawn_point.x << CSF);
	o->y = y - (sprites[o->sprite].spawn_point.y << CSF);
	o->dir = dir;
	o->xinertia = xinertia;
	o->yinertia = yinertia;
	o->linkedobject = linkedobject;
	
	// add into list
	LL_ADD_END(o, prev, next, firstobject, lastobject);
	LL_ADD_END(o, lower, higher, lowestobject, highestobject);
	
	// set it's initial blocked states, but do not update blockedstates on objects starting
	// with nullsprite-- the reason is for objects whose sprite is set after being spawned
	if (o->sprite != SPR_NULL)
		o->UpdateBlockStates(ALLDIRMASK);
	
	if (!(createflags & CF_NO_SPAWN_EVENT))
		o->OnSpawn();
	
	return o;
}

Object *CreateObject(int x, int y, int type)
{
	return CreateObject(x, y, type, 0, 0, RIGHT, NULL, CF_DEFAULT);
}

/*
void c------------------------------() {}
*/

// update the blocked states of all objects
void Objects::UpdateBlockStates(void)
{
	Object *o = firstobject;
	while(o)
	{
		o->lastblockl = o->blockl;
		o->lastblockr = o->blockr;
		o->lastblocku = o->blocku;
		o->lastblockd = o->blockd;
		
		o->UpdateBlockStates(ALLDIRMASK);
		o = o->next;
	}
}

// returns true if the bounding boxes of the two given objects are touching
bool hitdetect(Object *o1, Object *o2)
{
SIFSprite *s1, *s2;
int32_t rect1x1, rect1y1, rect1x2, rect1y2;
int32_t rect2x1, rect2y1, rect2x2, rect2y2;
	
	// get the sprites used by the two objects
	s1 = o1->Sprite();
	s2 = o2->Sprite();
	
	// get the bounding rectangle of the first object
	rect1x1 = o1->x + (s1->bbox.x1 << CSF);
	rect1x2 = o1->x + (s1->bbox.x2 << CSF);
	rect1y1 = o1->y + (s1->bbox.y1 << CSF);
	rect1y2 = o1->y + (s1->bbox.y2 << CSF);
	
	// get the bounding rectangle of the second object
	rect2x1 = o2->x + (s2->bbox.x1 << CSF);
	rect2x2 = o2->x + (s2->bbox.x2 << CSF);
	rect2y1 = o2->y + (s2->bbox.y1 << CSF);
	rect2y2 = o2->y + (s2->bbox.y2 << CSF);
	
	// find out if the rectangles overlap
	if ((rect1x1 < rect2x1) && (rect1x2 < rect2x1)) return false;
	if ((rect1x1 > rect2x2) && (rect1x2 > rect2x2)) return false;
	if ((rect1y1 < rect2y1) && (rect1y2 < rect2y1)) return false;
	if ((rect1y1 > rect2y2) && (rect1y2 > rect2y2)) return false;
	
	return true;
}

// returns true if the solidity boxes of the two given objects are touching
bool solidhitdetect(Object *o1, Object *o2)
{
SIFSprite *s1, *s2;
int32_t rect1x1, rect1y1, rect1x2, rect1y2;
int32_t rect2x1, rect2y1, rect2x2, rect2y2;
	
	// get the sprites used by the two objects
	s1 = o1->Sprite();
	s2 = o2->Sprite();
	
	// get the bounding rectangle of the first object
	rect1x1 = o1->x + (s1->solidbox.x1 << CSF);
	rect1x2 = o1->x + (s1->solidbox.x2 << CSF);
	rect1y1 = o1->y + (s1->solidbox.y1 << CSF);
	rect1y2 = o1->y + (s1->solidbox.y2 << CSF);
	
	// get the bounding rectangle of the second object
	rect2x1 = o2->x + (s2->solidbox.x1 << CSF);
	rect2x2 = o2->x + (s2->solidbox.x2 << CSF);
	rect2y1 = o2->y + (s2->solidbox.y1 << CSF);
	rect2y2 = o2->y + (s2->solidbox.y2 << CSF);
	
	// find out if the rectangles overlap
	if ((rect1x1 < rect2x1) && (rect1x2 < rect2x1)) return false;
	if ((rect1x1 > rect2x2) && (rect1x2 > rect2x2)) return false;
	if ((rect1y1 < rect2y1) && (rect1y2 < rect2y1)) return false;
	if ((rect1y1 > rect2y2) && (rect1y2 > rect2y2)) return false;
	
	return true;
}

/*
void c------------------------------() {}
*/

// runs all entity AI routines
void Objects::RunAI(void)
{
Object *o;

	// because we handle objects in order of their creation and have a separate list
	// for display order, we can't ever run AI twice in a frame because of z-order
	// rearrangement, and 2) objects created by other objects are added to the end of
	// the list and given a chance to run their AI routine before being displayed.
	FOREACH_OBJECT(o)
	{
		if (!o->deleted)
			o->RunAI();
	}
}


// the most important thing it does is apply x/y inertia to the objects.
void Objects::PhysicsSim(void)
{
Object *o;
int xinertia, yinertia;

	FOREACH_OBJECT(o)
	{
		if (o != player && !o->deleted)		// player is moved in PDoPhysics
		{
			if (!(o->flags & FLAG_IGNORE_SOLID) && \
				!(o->nxflags & NXFLAG_NO_RESET_YINERTIA))
			{
				if (o->blockd && o->yinertia > 0) o->yinertia = 0;
				if (o->blocku && o->yinertia < 0) o->yinertia = 0;
			}
			
			// apply inertia to X,Y position
			xinertia = o->xinertia;
			yinertia = o->yinertia;
			if (o->shaketime)
			{
				if (o->nxflags & NXFLAG_SLOW_X_WHEN_HURT) xinertia >>= 1;
				if (o->nxflags & NXFLAG_SLOW_Y_WHEN_HURT) yinertia >>= 1;
			}
			
			o->apply_xinertia(xinertia);
			o->apply_yinertia(yinertia);
			
			// flag_solid_brick objects push player as they move
			if (o->flags & FLAG_SOLID_BRICK)
			{
				o->PushPlayerOutOfWay(xinertia, yinertia);
			}
			else if (o->damage > 0)
			{
				// have enemies hurt you when you touch them
				// (solid-brick objects do this in PHandleSolidBrickObjects)
				if (hitdetect(o, player))
					o->DealContactDamage();
			}
		}
	}
}

/*
void c------------------------------() {}
*/

// returns how many objects exist of the given type
int Objects::CountType(int objtype)
{
	int count = 0;
	Object *o;
	
	FOREACH_OBJECT(o)
	{
		if (o->type == objtype)
			count++;
	}
	
	return count;
}

// returns the first object of type objtype or NULL
Object *Objects::FindByType(int objtype)
{
	Object *o;
	FOREACH_OBJECT(o)
	{
		if (o->type == objtype)
			return o;
	}
	
	return NULL;
}

/*
void c------------------------------() {}
*/

// free objects deleted earlier via ObjDel
void Objects::CullDeleted(void)
{
Object *o, *next;

	o = firstobject;
	while(o)
	{
		next = o->next;
		
		if (o->deleted)
		{
			o->Destroy();
		}
		
		o = next;
	}
}

// deletes all objects. if delete_player is true, also deletes the player.
// used by load_pxe to reset the game in preperation for loading a new maplayer->
void Objects::DestroyAll(bool delete_player)
{
Object *o, *next;

	o = firstobject;
	while(o)
	{
		next = o->next;
		
		if (o != player)
		{
			o->Destroy();
		}
		
		o = next;
	}
	
	// must do this last to avoid crashes as player ptr gets invalidated
	if (delete_player)
	{
		player->Destroy();
	}
	
	memset(ID2Lookup, 0, sizeof(ID2Lookup));
}