//========= Copyright © 1996-2005, Valve Corporation, All rights reserved. ============//
//
// Purpose: 
//
// $Workfile:     $
// $Date:         $
//
//-----------------------------------------------------------------------------
// $Log: $
//
// $NoKeywords: $
//=============================================================================//

#ifndef VRAD_H
#define VRAD_H
#pragma once


#include "commonmacros.h"
#include "worldsize.h"
#include "cmdlib.h"
#include "mathlib/mathlib.h"
#include "bsplib.h"
#include "polylib.h"
#include "threads.h"
#include "builddisp.h"
#include "VRAD_DispColl.h"
#include "UtlMemory.h"
#include "UtlHash.h"
#include "UtlVector.h"
#include "iincremental.h"
#include "raytrace.h"


#ifdef _WIN32
#include <windows.h>
#endif

#include <sys/types.h>
#include <sys/stat.h>

#pragma warning(disable: 4142 4028)
#include <io.h>
#pragma warning(default: 4142 4028)

#include <fcntl.h>
#include <direct.h>
#include <ctype.h>


// Can remove these options if they don't generate problems.
//#define SAMPLEHASH_USE_AREA_PATCHES	// Add patches to sample hash based on their AABB instead of as a single point.
#define SAMPLEHASH_QUERY_ONCE		// Big optimization - causes way less sample hash queries.

extern float dispchop; // "-dispchop" tightest number of luxel widths for a patch, used on edges
extern float g_MaxDispPatchRadius;

//-----------------------------------------------------------------------------
// forward declarations
//-----------------------------------------------------------------------------

struct Ray_t;

#define		TRANSFER_EPSILON		0.0000001

struct directlight_t
{
	int		index;

	directlight_t *next;
	dworldlight_t light;

	byte	*pvs;		// accumulated domain of the light
	int		facenum;	// domain of attached lights
	int		texdata;	// texture source of traced lights

	Vector	snormal;
	Vector	tnormal;
	float	sscale;
	float	tscale;
	float	soffset;
	float	toffset;

	int		dorecalc; // position, vector, spot angle, etc.
	IncrementalLightID	m_IncrementalID;

	// hard-falloff lights (lights that fade to an actual zero). between m_flStartFadeDistance and
	// m_flEndFadeDistance, a smoothstep to zero will be done, so that the light goes to zero at
	// the end.
	float m_flStartFadeDistance;
	float m_flEndFadeDistance;
	float m_flCapDist;										// max distance to feed in

	directlight_t(void)
	{
		m_flEndFadeDistance = -1.0;							// end<start indicates not set
		m_flStartFadeDistance= 0.0;
		m_flCapDist = 1.0e22;

	}
};

struct bumplights_t
{
	Vector	light[NUM_BUMP_VECTS+1];
};


struct transfer_t
{
	int	patch;
	float	transfer;
};


struct LightingValue_t
{
	Vector m_vecLighting;
	float m_flDirectSunAmount;

	FORCEINLINE bool IsValid( void ) const
	{
		return ( m_vecLighting.x >= 0 && 
				 m_vecLighting.y >= 0 && 
				 m_vecLighting.z >= 0 &&
				 m_vecLighting.x < 1e10 && 
				 m_vecLighting.y < 1e10 && 
				 m_vecLighting.z < 1e10 );
	}

	FORCEINLINE void Zero( void )
	{
		m_vecLighting.Init( 0, 0, 0 );
		m_flDirectSunAmount = 0.0;
	}
	
	FORCEINLINE void Scale( float m_flScale )
	{
		m_vecLighting *= m_flScale;
		m_flDirectSunAmount *= m_flScale;
	}

	FORCEINLINE void AddWeighted( LightingValue_t const &src, float flWeight )
	{
		m_vecLighting += flWeight * src.m_vecLighting;
		m_flDirectSunAmount += flWeight * src.m_flDirectSunAmount;
	}

	FORCEINLINE void AddWeighted( Vector const &src, float flWeight )
	{
		m_vecLighting += flWeight * src;
	}

	FORCEINLINE float Intensity( void ) const
	{
		return m_vecLighting.x + m_vecLighting.y + m_vecLighting.z;
	}

	FORCEINLINE void AddLight( float flAmount, Vector const &vecColor, float flSunAmount = 0.0 )
	{
		VectorMA( m_vecLighting, flAmount, vecColor, m_vecLighting );
		m_flDirectSunAmount += flSunAmount;
		Assert( this->IsValid() );
	}


	FORCEINLINE void AddLight( LightingValue_t const &src )
	{
		m_vecLighting += src.m_vecLighting;
		m_flDirectSunAmount += src.m_flDirectSunAmount;
		Assert( this->IsValid() );
	}
	
	FORCEINLINE void Init( float x, float y, float z )
	{
		m_vecLighting.Init( x, y, z );
		m_flDirectSunAmount = 0.0;
	}


};


#define	MAX_PATCHES	(4*65536)

struct CPatch
{
	winding_t	*winding;
	Vector		mins, maxs, face_mins, face_maxs;

	Vector		origin;				// adjusted off face by face normal

	dplane_t	*plane;				// plane (corrected for facing)
	
	unsigned short		m_IterationKey;	// Used to prevent touching the same patch multiple times in the same query.
										// See IncrementPatchIterationKey().
	
	// these are packed into one dword
	unsigned int normalMajorAxis : 2;	// the major axis of base face normal
	unsigned int sky : 1;
	unsigned int needsBumpmap : 1;
	unsigned int pad : 28;

	Vector		normal;				// adjusted for phong shading

	float		planeDist;			// Fixes up patch planes for brush models with an origin brush

	float		chop;				// smallest acceptable width of patch face
	float		luxscale;			// average luxels per world coord
	float		scale[2];			// Scaling of texture in s & t

	bumplights_t totallight;		// accumulated by radiosity
									// does NOT include light
									// accounted for by direct lighting
	Vector		baselight;			// emissivity only
	float		basearea;			// surface per area per baselight instance

	Vector		directlight;		// direct light value
	float		area;

	Vector		reflectivity;		// Average RGB of texture, modified by material type.

	Vector		samplelight;
	float		samplearea;		// for averaging direct light
	int			faceNumber;
	int			clusterNumber;

	int			parent;			// patch index of parent
	int			child1;			// patch index for children
	int			child2;

	int			ndxNext;					// next patch index in face
	int			ndxNextParent;				// next parent patch index in face
	int			ndxNextClusterChild;		// next terminal child index in cluster
//	struct		patch_s		*next;					// next in face
//	struct		patch_s		*nextparent;		    // next in face
//	struct		patch_s		*nextclusterchild;		// next terminal child in cluster

	int			numtransfers;
	transfer_t	*transfers;

	short		indices[3];				// displacement use these for subdivision
};


extern CUtlVector<CPatch>	g_Patches;
extern CUtlVector<int>		g_FacePatches;		// constains all patches, children first
extern CUtlVector<int>		faceParents;		// contains only root patches, use next parent to iterate
extern CUtlVector<int>		clusterChildren;


struct sky_camera_t
{
	Vector origin;
	float world_to_sky;
	float sky_to_world;
	int area;
};

extern int num_sky_cameras;
extern sky_camera_t sky_cameras[MAX_MAP_AREAS];
extern int area_sky_cameras[MAX_MAP_AREAS];
void ProcessSkyCameras();

extern entity_t		*face_entity[MAX_MAP_FACES];
extern Vector		face_offset[MAX_MAP_FACES];		// for rotating bmodels
extern Vector		face_centroids[MAX_MAP_EDGES];
extern int			leafparents[MAX_MAP_LEAFS];
extern int			nodeparents[MAX_MAP_NODES];
extern float		lightscale;
extern float		dlight_threshold;
extern float		coring;
extern qboolean		g_bDumpPatches;
extern bool			bRed2Black;
extern bool         g_bNoSkyRecurse;
extern bool			bDumpNormals;
extern bool			g_bFastAmbient;
extern float		maxchop;
extern FileHandle_t	pFileSamples[4][4];
extern qboolean		g_bLowPriority;
extern qboolean		do_fast;
extern bool			g_bInterrupt;		// Was used with background lighting in WC. Tells VRAD to stop lighting.
extern IIncremental *g_pIncremental;	// null if not doing incremental lighting

extern float g_flSkySampleScale;								// extra sampling factor for indirect light

extern bool g_bLargeDispSampleRadius;
extern bool g_bStaticPropPolys;
extern bool g_bTextureShadows;
extern bool g_bShowStaticPropNormals;
extern bool g_bDisablePropSelfShadowing;

extern CUtlVector<char const *> g_NonShadowCastingMaterialStrings;
extern void ForceTextureShadowsOnModel( const char *pModelName );
extern bool IsModelTextureShadowsForced( const char *pModelName );

// Raytracing

#define TRACE_ID_SKY           0x01000000  // sky face ray blocker
#define TRACE_ID_OPAQUE        0x02000000  // everyday light blocking face
#define TRACE_ID_STATICPROP    0x04000000  // static prop - lower bits are prop ID
extern RayTracingEnvironment g_RtEnv;

#include "mpivrad.h"

void MakeShadowSplits (void);

//==============================================

void BuildVisMatrix (void);
void BuildClusterTable( void );
void AddDispsToClusterTable( void );
void FreeVisMatrix (void);
// qboolean CheckVisBit (unsigned int p1, unsigned int p2);
void TouchVMFFile (void);

//==============================================

extern  qboolean do_extra;
extern  qboolean do_fast;
extern  qboolean do_centersamples;
extern  int extrapasses;
extern	Vector ambient;
extern  float maxlight;
extern	unsigned numbounce;
extern  qboolean g_bLogHashData;
extern  bool	debug_extra;
extern	directlight_t	*activelights;
extern	directlight_t	*freelights;

// because of hdr having two face lumps (light styles can cause them to be different, among other
// things), we need to always access (r/w) face data though this pointer
extern dface_t *g_pFaces;


extern bool g_bMPIProps;

extern	byte	nodehit[MAX_MAP_NODES];
extern  float	gamma;
extern	float	indirect_sun;
extern	float	smoothing_threshold;
extern	int		dlight_map;

extern float	g_flMaxDispSampleSize;
extern float	g_SunAngularExtent;

extern char		source[MAX_PATH];

// Used by incremental lighting to trivial-reject faces.
// There is a bit in here for each face telling whether or not any of the
// active lights can see the face.
extern CUtlVector<byte> g_FacesVisibleToLights;

void MakeTnodes (dmodel_t *bm);
void PairEdges (void);

void SaveVertexNormals( void );

qboolean IsIncremental(char *filename);
int SaveIncremental(char *filename);
int PartialHead (void);
void BuildFacelights (int facenum, int threadnum);
void PrecompLightmapOffsets();
void FinalLightFace (int threadnum, int facenum);
void PvsForOrigin (Vector& org, byte *pvs);
void ConvertRGBExp32ToRGBA8888( const ColorRGBExp32 *pSrc, unsigned char *pDst );

inline byte PVSCheck( const byte *pvs, int iCluster )
{
	if ( iCluster >= 0 )
	{
		return pvs[iCluster >> 3] & ( 1 << ( iCluster & 7 ) );
	}
	else
	{
		// PointInLeaf still returns -1 for valid points sometimes and rather than 
		// have black samples, we assume the sample is in the PVS.
		return 1;
	}
}

// outputs 1 in fractionVisible if no occlusion, 0 if full occlusion, and in-between values
void TestLine( FourVectors const& start, FourVectors const& stop, fltx4 *pFractionVisible, int static_prop_index_to_ignore=-1);

// returns 1 if the ray sees the sky, 0 if it doesn't, and in-between values for partial coverage
void TestLine_DoesHitSky( FourVectors const& start, FourVectors const& stop,
                          fltx4 *pFractionVisible, bool canRecurse = true, int static_prop_to_skip=-1, bool bDoDebug = false );

// converts any marked brush entities to triangles for shadow casting
void ExtractBrushEntityShadowCasters ( void );
void AddBrushesForRayTrace ( void );

void BaseLightForFace( dface_t *f, Vector& light, float *parea, Vector& reflectivity );
void CreateDirectLights (void);
void GetPhongNormal( int facenum, Vector const& spot, Vector& phongnormal );
int LightForString( char *pLight, Vector& intensity );
void MakeTransfer( int ndxPatch1, int ndxPatch2, transfer_t *all_transfers );
void MakeScales( int ndxPatch, transfer_t *all_transfers );

// Run startup code like initialize mathlib.
void VRAD_Init();

// Load the BSP file and prepare to do the lighting.
// This is called after any command-line parameters have been set.
void VRAD_LoadBSP( char const *pFilename );

int VRAD_Main(int argc, char **argv);

// This performs an actual lighting pass.
// Returns true if the process was interrupted (with g_bInterrupt).
bool RadWorld_Go();

dleaf_t		*PointInLeaf (Vector const& point);
int			ClusterFromPoint( Vector const& point );
winding_t	*WindingFromFace (dface_t *f, Vector& origin );

void WriteWinding (FileHandle_t out, winding_t *w, Vector& color );
void WriteNormal( FileHandle_t out, Vector const &nPos, Vector const &nDir, 
				  float length, Vector const &color );
void WriteLine( FileHandle_t out, const Vector &vecPos1, const Vector &vecPos2, const Vector &color );
void WriteTrace( const char *pFileName, const FourRays &rays, const RayTracingResult& result );

#ifdef STATIC_FOG
qboolean IsFog( dface_t * f );
#endif

#define CONTENTS_EMPTY	0
#define TEX_SPECIAL		(SURF_SKY|SURF_NOLIGHT)

//=============================================================================

// trace.cpp

bool AddDispCollTreesToWorld( void );
int PointLeafnum( Vector const &point );
float TraceLeafBrushes( int leafIndex, const Vector &start, const Vector &end, CBaseTrace &traceOut );

//=============================================================================

// dispinfo.cpp

struct SSE_sampleLightOutput_t
{
	fltx4 m_flDot[NUM_BUMP_VECTS+1];
	fltx4 m_flFalloff;
	fltx4 m_flSunAmount;
};

#define GATHERLFLAGS_FORCE_FAST 1
#define GATHERLFLAGS_IGNORE_NORMALS 2

// SSE Gather light stuff
void GatherSampleLightSSE( SSE_sampleLightOutput_t &out, directlight_t *dl, int facenum, 
					   FourVectors const& pos, FourVectors *pNormals, int normalCount, int iThread,
					   int nLFlags = 0,					// GATHERLFLAGS_xxx
					   int static_prop_to_skip=-1,
					   float flEpsilon = 0.0 );
//void GatherSampleSkyLightSSE( SSE_sampleLightOutput_t &out, directlight_t *dl, int facenum, 
//							 FourVectors const& pos, FourVectors *pNormals, int normalCount, int iThread,
//							 int nLFlags = 0,
//							 int static_prop_to_skip=-1,
//							 float flEpsilon = 0.0 );
//void GatherSampleAmbientSkySSE( SSE_sampleLightOutput_t &out, directlight_t *dl, int facenum, 
//						  FourVectors const& pos, FourVectors *pNormals, int normalCount, int iThread,
//						  int nLFlags = 0,					// GATHERLFLAGS_xxx
//						  int static_prop_to_skip=-1,
//						  float flEpsilon = 0.0 );
//void GatherSampleStandardLightSSE( SSE_sampleLightOutput_t &out, directlight_t *dl, int facenum, 
//						  FourVectors const& pos, FourVectors *pNormals, int normalCount, int iThread,
//						  int nLFlags = 0,					// GATHERLFLAGS_xxx
//						  int static_prop_to_skip=-1,
//						  float flEpsilon = 0.0 );

//-----------------------------------------------------------------------------
// VRad Displacements
//-----------------------------------------------------------------------------

struct facelight_t;
typedef struct radial_s radial_t;
struct lightinfo_t;

// NOTE: should probably come up with a bsptreetested_t struct or something,
//       see below (PropTested_t)
struct DispTested_t
{
	int	m_Enum;
	int	*m_pTested;
};

class IVRadDispMgr
{
public:
	// creation/destruction
	virtual void Init( void ) = 0;
	virtual void Shutdown( void ) = 0;

	// "CalcPoints"
	virtual bool BuildDispSamples( lightinfo_t *pLightInfo, facelight_t *pFaceLight, int ndxFace ) = 0;
	virtual bool BuildDispLuxels( lightinfo_t *pLightInfo, facelight_t *pFaceLight, int ndxFace ) = 0;
	virtual bool BuildDispSamplesAndLuxels_DoFast( lightinfo_t *pLightInfo, facelight_t *pFaceLight, int ndxFace ) = 0;

	// patching functions
	virtual void MakePatches( void ) = 0;
	virtual void SubdividePatch( int iPatch ) = 0;

	// pre "FinalLightFace"
	virtual void InsertSamplesDataIntoHashTable( void ) = 0;
	virtual void InsertPatchSampleDataIntoHashTable( void ) = 0;

	// "FinalLightFace"
	virtual radial_t *BuildLuxelRadial( int ndxFace, int ndxStyle, bool bBump ) = 0;
	virtual bool SampleRadial( int ndxFace, radial_t *pRadial, Vector const &vPos, int ndxLxl, LightingValue_t *pLightSample, int sampleCount, bool bPatch ) = 0;
	virtual radial_t *BuildPatchRadial( int ndxFace, bool bBump ) = 0;

	// utility
	virtual	void GetDispSurfNormal( int ndxFace, Vector &pt, Vector &ptNormal, bool bInside ) = 0;
	virtual void GetDispSurf( int ndxFace, CVRADDispColl **ppDispTree ) = 0;

	// bsp tree functions
	virtual bool ClipRayToDisp( DispTested_t &dispTested, Ray_t const &ray ) = 0;
	virtual bool ClipRayToDispInLeaf( DispTested_t &dispTested, Ray_t const &ray, int ndxLeaf ) = 0;
	virtual void ClipRayToDispInLeaf( DispTested_t &dispTested, Ray_t const &ray, 
				int ndxLeaf, float& dist, dface_t*& pFace, Vector2D& luxelCoord ) = 0;
	virtual void ClipRayToDispInLeaf( DispTested_t &dispTested, Ray_t const &ray, 
		int ndxLeaf, float& dist, Vector *pNormal ) = 0;
	virtual void StartRayTest( DispTested_t &dispTested ) = 0;
	virtual void AddPolysForRayTrace() = 0;

	// general timing -- should be moved!!
	virtual void StartTimer( const char *name ) = 0;
	virtual void EndTimer( void ) = 0;
};

IVRadDispMgr *StaticDispMgr( void );

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
inline bool ValidDispFace( dface_t *pFace )
{
	if( !pFace ) { return false; }
	if( pFace->dispinfo == -1 ) { return false; }
	if( pFace->numedges != 4 ) { return false; }

	return true;
}

#define SAMPLEHASH_VOXEL_SIZE			64.0f
typedef unsigned int SampleHandle_t;				// the upper 16 bits = facelight index (works because max face are 65536)
													// the lower 16 bits = sample index inside of facelight
struct sample_t;
struct SampleData_t
{
	unsigned short				x, y, z;
	CUtlVector<SampleHandle_t>	m_Samples;
};

struct PatchSampleData_t
{
	unsigned short				x, y, z;
	CUtlVector<int>				m_ndxPatches;
};

UtlHashHandle_t SampleData_AddSample( sample_t *pSample, SampleHandle_t sampleHandle );
void PatchSampleData_AddSample( CPatch *pPatch, int ndxPatch );
unsigned short IncrementPatchIterationKey();
void SampleData_Log( void );

extern CUtlHash<SampleData_t>		g_SampleHashTable;
extern CUtlHash<PatchSampleData_t>	g_PatchSampleHashTable;

extern int samplesAdded;
extern int patchSamplesAdded;

//-----------------------------------------------------------------------------
// Computes lighting for the detail props
//-----------------------------------------------------------------------------

void ComputeDetailPropLighting( int iThread );
void ComputeIndirectLightingAtPoint( Vector &position, Vector &normal, Vector &outColor, 
									 int iThread, bool force_fast = false, bool bIgnoreNormals = false );

//-----------------------------------------------------------------------------
// VRad static props
//-----------------------------------------------------------------------------
class IPhysicsCollision;
struct PropTested_t
{
	int m_Enum;
	int* m_pTested;
	IPhysicsCollision *pThreadedCollision;
};

class IVradStaticPropMgr
{
public:
	// methods of IStaticPropMgr
	virtual void Init() = 0;
	virtual void Shutdown() = 0;
	virtual void ComputeLighting( int iThread ) = 0;
	virtual void AddPolysForRayTrace() = 0;
};

//extern PropTested_t s_PropTested[MAX_TOOL_THREADS+1];
extern DispTested_t s_DispTested[MAX_TOOL_THREADS+1];

IVradStaticPropMgr* StaticPropMgr();

extern float ComputeCoverageFromTexture( float b0, float b1, float b2, int32 hitID );

#endif // VRAD_H
