gzdoom/src/portal.h

#ifndef _PORTALS_H_
#define _PORTALS_H_

#include "basictypes.h"
#include "v_video.h"
#include "r_defs.h"
#include "actor.h"
#include "p_local.h"
#include "m_bbox.h"


enum
{
	PORTF_VISIBLE = 1,
	PORTF_PASSABLE = 2,
	PORTF_SOUNDTRAVERSE = 4,
	PORTF_INTERACTIVE = 8,

	PORTF_TYPETELEPORT = PORTF_VISIBLE | PORTF_PASSABLE | PORTF_SOUNDTRAVERSE,
	PORTF_TYPEINTERACTIVE = PORTF_VISIBLE | PORTF_PASSABLE | PORTF_SOUNDTRAVERSE | PORTF_INTERACTIVE,
};

enum
{
	PORTT_VISUAL,
	PORTT_TELEPORT,
	PORTT_INTERACTIVE,
	PORTT_LINKED,
	PORTT_LINKEDEE	// Eternity compatible definition which uses only one line ID and a different anchor type to link to.
};

enum
{
	PORG_ABSOLUTE,	// does not align at all. z-ccoordinates must match.
	PORG_FLOOR,
	PORG_CEILING,
};

struct FLinePortal
{
	line_t *mOrigin;
	line_t *mDestination;
	fixed_t mXDisplacement;
	fixed_t mYDisplacement;
	BYTE mType;
	BYTE mFlags;
	BYTE mDefFlags;
	BYTE mAlign;
};

extern TArray<FLinePortal> linePortals;

void P_SpawnLinePortal(line_t* line);
void P_FinalizePortals();


/* code ported from prototype */
bool P_ClipLineToPortal(line_t* line, line_t* portal, fixed_t viewx, fixed_t viewy, bool partial = true, bool samebehind = true);
void P_TranslatePortalXY(line_t* src, line_t* dst, fixed_t& x, fixed_t& y);
void P_TranslatePortalVXVY(line_t* src, line_t* dst, fixed_t& vx, fixed_t& vy);
void P_TranslatePortalAngle(line_t* src, line_t* dst, angle_t& angle);
void P_TranslatePortalZ(line_t* src, line_t* dst, fixed_t& z);
void P_NormalizeVXVY(fixed_t& vx, fixed_t& vy);

// basically, this is a teleporting tracer function,
// which can be used by itself (to calculate portal-aware offsets, say, for projectiles)
// or to teleport normal tracers (like hitscan, railgun, autoaim tracers)
class PortalTracer
{
public:
	PortalTracer(fixed_t startx, fixed_t starty, fixed_t endx, fixed_t endy);

	// trace to next portal
	bool TraceStep();
	// trace to last available portal on the path
	void TraceAll() { while (TraceStep()) continue; }

	int depth;
	fixed_t startx;
	fixed_t starty;
	fixed_t intx;
	fixed_t inty;
	fixed_t intxIn;
	fixed_t intyIn;
	fixed_t endx;
	fixed_t endy;
	angle_t angle;
	fixed_t z;
	fixed_t frac;
	line_t* in;
	line_t* out;
	fixed_t vx;
	fixed_t vy;
};

/* new code */
fixed_t P_PointLineDistance(line_t* line, fixed_t x, fixed_t y);


// returns true if the portal is crossable by actors
inline bool line_t::isLinePortal() const
{
	return portalindex >= linePortals.Size() ? false : !!(linePortals[portalindex].mFlags & PORTF_PASSABLE);
}

// returns true if the portal needs to be handled by the renderer
inline bool line_t::isVisualPortal() const
{
	return portalindex >= linePortals.Size() ? false : !!(linePortals[portalindex].mFlags & PORTF_VISIBLE);
}

inline line_t *line_t::getPortalDestination() const
{
	return portalindex >= linePortals.Size() ? (line_t*)NULL : linePortals[portalindex].mDestination;
}

inline int line_t::getPortalAlignment() const
{
	return portalindex >= linePortals.Size() ? 0 : linePortals[portalindex].mAlign;
}

#endif