qzdoom/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"
#include "a_sharedglobal.h"

struct FDisplacement
{
	fixed_t x, y;
	bool isSet;
	BYTE indirect;	// just for illustration.
};

struct FDisplacementTable
{
	TArray<FDisplacement> data;
	int size;

	void Create(int numgroups)
	{
		data.Resize(numgroups*numgroups);
		memset(&data[0], 0, numgroups*numgroups*sizeof(data[0]));
		size = numgroups;
	}

	FDisplacement &operator()(int x, int y)
	{
		return data[x + size*y];
	}
};

extern FDisplacementTable Displacements;

struct FPortalGroupTable
{
	TArray<DWORD> data;
	TArray<int> touchingGroups;

	void setSize(int num)
	{
		data.Resize((num + 31) / 32);
		memset(&data[0], 0, data.Size()*sizeof(DWORD));
	}

	void clear()
	{
		data.Clear();
		touchingGroups.Clear();
	}

	void setBit(int group)
	{
		if (!getBit(group))
		{
			data[group >> 5] |= (1 << (group & 31));
			touchingGroups.Push(group);
		}
	}

	int getBit(int group)
	{
		return data[group >> 5] & (1 << (group & 31));
	}
};

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,
};

enum
{
	PCOLL_NOTLINKED = 1,
	PCOLL_LINKED = 2
};

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();
bool P_ChangePortal(line_t *ln, int thisid, int destid);
void P_CreateLinkedPortals();
bool P_CollectConnectedGroups(AActor *actor, fixed_t newx, fixed_t newy, FPortalGroupTable &out);
void P_CollectLinkedPortals();
inline int P_NumPortalGroups()
{
	return Displacements.size;
}


/* 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;
}

inline bool sector_t::PortalBlocksView(int plane)
{
	if (SkyBoxes[plane] == NULL || SkyBoxes[plane]->special1 != SKYBOX_LINKEDPORTAL) return true;
	return !!(planes[plane].Flags & (PLANEF_NORENDER | PLANEF_DISABLED | PLANEF_OBSTRUCTED));
}

inline bool sector_t::PortalBlocksMovement(int plane)
{
	if (SkyBoxes[plane] == NULL || SkyBoxes[plane]->special1 != SKYBOX_LINKEDPORTAL) return true;
	return !!(planes[plane].Flags & (PLANEF_NOPASS | PLANEF_DISABLED | PLANEF_OBSTRUCTED));
}

inline bool sector_t::PortalBlocksSound(int plane)
{
	if (SkyBoxes[plane] == NULL || SkyBoxes[plane]->special1 != SKYBOX_LINKEDPORTAL) return true;
	return !!(planes[plane].Flags & (PLANEF_BLOCKSOUND | PLANEF_DISABLED | PLANEF_OBSTRUCTED));
}

#endif