/*
 * Copyright (C) 1996-1997 Id Software, Inc.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 * 
 */
// r_local.h -- private refresh defs

#include "r_shared.h"

#define ALIAS_BASE_SIZE_RATIO	(1.0 / 11.0)    // normalizing factor so player model works out to about
                                                // 1 pixel per triangle

#define BMODEL_FULLY_CLIPPED	0x10   // value returned by R_BmodelCheckBBox ()
                                        // if bbox is trivially rejected

// viewmodel lighting

typedef struct {
    int           ambientlight;
    int           shadelight;
    float        *plightvec;
} alight_t;

// clipped bmodel edges

typedef struct bedge_s {
    mvertex_t    *v[2];
    struct bedge_s *pnext;
} bedge_t;

typedef struct {
    float         fv[3];               // viewspace x, y
} auxvert_t;

extern cvar_t r_draworder;
extern cvar_t r_speeds;
extern cvar_t r_timegraph;
extern cvar_t r_graphheight;
extern cvar_t r_clearcolor;
extern cvar_t r_waterwarp;
extern cvar_t r_fullbright;
extern cvar_t r_drawentities;
extern cvar_t r_aliasstats;
extern cvar_t r_dspeeds;
extern cvar_t r_drawflat;
extern cvar_t r_ambient;
extern cvar_t r_reportsurfout;
extern cvar_t r_maxsurfs;
extern cvar_t r_numsurfs;
extern cvar_t r_reportedgeout;
extern cvar_t r_maxedges;
extern cvar_t r_numedges;
extern cvar_t r_fullbrightskins;

#define XCENTERING	(1.0 / 2.0)
#define YCENTERING	(1.0 / 2.0)

#define CLIP_EPSILON		0.001

#define BACKFACE_EPSILON	0.01

#define	DIST_NOT_SET	98765

// !!! if this is changed, it must be changed in asm_draw.h too !!!
typedef struct clipplane_s {
    vec3_t        normal;
    float         dist;
    struct clipplane_s *next;
    byte          leftedge;
    byte          rightedge;
    byte          reserved[2];
} clipplane_t;

extern clipplane_t view_clipplanes[4];

void          R_RenderWorld (void);

extern mplane_t screenedge[4];

extern vec3_t r_origin;
extern vec3_t r_entorigin;

extern float  screenAspect;
extern float  verticalFieldOfView;
extern float  xOrigin, yOrigin;

extern int    r_visframecount;

extern int    vstartscan;

void          R_ClearPolyList (void);
void          R_DrawPolyList (void);

// current entity info
extern qboolean insubmodel;

void          R_DrawSprite (void);
void          R_RenderFace (msurface_t * fa, int clipflags);
void          R_RenderBmodelFace (bedge_t * pedges, msurface_t * psurf);
void          R_TransformPlane (mplane_t * p, float *normal, float *dist);
void          R_TransformFrustum (void);
void          R_SetSkyFrame (void);
void          R_DrawSurfaceBlock8 (void);
texture_t    *R_TextureAnimation (texture_t * base);

#if id386

void          R_DrawSurfaceBlock8_mip0 (void);
void          R_DrawSurfaceBlock8_mip1 (void);
void          R_DrawSurfaceBlock8_mip2 (void);
void          R_DrawSurfaceBlock8_mip3 (void);

#endif

void          R_GenSkyTile (void *pdest);
void          R_Surf8Patch (void);
void          R_DrawSubmodelPolygons (model_t * pmodel, int clipflags);
void          R_DrawSolidClippedSubmodelPolygons (model_t * pmodel);

void          R_AddPolygonEdges (emitpoint_t * pverts, int numverts, int miplevel);
surf_t       *R_GetSurf (void);
void          R_AliasDrawModel (alight_t * plighting);
void          R_BeginEdgeFrame (void);
void          R_ScanEdges (void);
void          D_DrawSurfaces (void);
void          R_InsertNewEdges (edge_t * edgestoadd, edge_t * edgelist);
void          R_StepActiveU (edge_t * pedge);
void          R_RemoveEdges (edge_t * pedge);

extern void   R_Surf8Start (void);
extern void   R_Surf8End (void);
extern void   R_Surf16Start (void);
extern void   R_Surf16End (void);
extern void   R_EdgeCodeStart (void);
extern void   R_EdgeCodeEnd (void);

extern void   R_RotateBmodel (void);

extern int    c_faceclip;
extern int    r_polycount;
extern int    r_wholepolycount;

extern model_t *cl_worldmodel;

extern int   *pfrustum_indexes[4];

// !!! if this is changed, it must be changed in asm_draw.h too !!!
#define	NEAR_CLIP	0.01

extern int    ubasestep, errorterm, erroradjustup, erroradjustdown;
extern int    vstartscan;

extern fixed16_t sadjust, tadjust;
extern fixed16_t bbextents, bbextentt;

extern mvertex_t *r_ptverts, *r_ptvertsmax;

extern vec3_t sbaseaxis[3], tbaseaxis[3];
extern float  entity_rotation[3][3];

extern int    reinit_surfcache;

extern int    r_currentkey;
extern int    r_currentbkey;

void          R_InitTurb (void);

// Alias models

#define MAXALIASVERTS		2000   // TODO: tune this
#define ALIAS_Z_CLIP_PLANE	5

extern int    numverts;
extern int    a_skinwidth;
extern mtriangle_t *ptriangles;
extern int    numtriangles;
extern aliashdr_t *paliashdr;
extern mdl_t *pmdl;
extern float  leftclip, topclip, rightclip, bottomclip;
extern int    r_acliptype;
extern finalvert_t *pfinalverts;
extern auxvert_t *pauxverts;

qboolean      R_AliasCheckBBox (void);

// turbulence stuff

#define	AMP	8*0x10000
#define	AMP2	3
#define	SPEED	20

// particle stuff

void          R_DrawParticles (void);
void          R_InitParticles (void);
void          R_ClearParticles (void);
void          R_ReadPointFile_f (void);
void          R_SurfacePatch (void);

extern int    r_amodels_drawn;
extern edge_t *auxedges;
extern int    r_numallocatededges;
extern edge_t *r_edges, *edge_p, *edge_max;

extern edge_t *newedges[MAXHEIGHT];
extern edge_t *removeedges[MAXHEIGHT];

extern int    screenwidth;

// FIXME: make stack vars when debugging done
extern edge_t edge_head;
extern edge_t edge_tail;
extern edge_t edge_aftertail;
extern int    r_bmodelactive;

extern float  aliasxscale, aliasyscale, aliasxcenter, aliasycenter;
extern float  r_aliastransition, r_resfudge;

extern int    r_outofsurfaces;
extern int    r_outofedges;

extern mvertex_t *r_pcurrentvertbase;
extern int    r_maxvalidedgeoffset;

void          R_AliasClipTriangle (mtriangle_t * ptri);

extern float  r_time1;
extern float  dp_time1, dp_time2, db_time1, db_time2, rw_time1, rw_time2;
extern float  se_time1, se_time2, de_time1, de_time2, dv_time1, dv_time2;
extern int    r_frustum_indexes[4 * 6];
extern int    r_maxsurfsseen, r_maxedgesseen, r_cnumsurfs;
extern qboolean r_surfsonstack;
extern qboolean r_dowarpold, r_viewchanged;

extern mleaf_t *r_viewleaf, *r_oldviewleaf;

extern vec3_t r_emins, r_emaxs;
extern mnode_t *r_pefragtopnode;
extern int    r_clipflags;
extern int    r_dlightframecount;
extern qboolean r_fov_greater_than_90;

void          R_StoreEfrags (efrag_t ** ppefrag);
void          R_TimeRefresh_f (void);
void          R_TimeGraph (void);
void          R_PrintAliasStats (void);
void          R_PrintTimes (void);
void          R_PrintDSpeeds (void);
void          R_AnimateLight (void);
int           R_LightPoint (vec3_t p);
void          R_SetupFrame (void);
void          R_cshift_f (void);
void          R_EmitEdge (mvertex_t * pv0, mvertex_t * pv1);
void          R_ClipEdge (mvertex_t * pv0, mvertex_t * pv1, clipplane_t * clip);
void          R_SplitEntityOnNode2 (mnode_t * node);
void          R_MarkLights (dlight_t * light, int lnum, mnode_t * node);

// !!! if this is changed, it must be changed in d_ifacea.h too !!!
#define CACHE_SIZE	32             // used to align key data structures
