// r_shared.h: general refresh-related stuff shared between the refresh and the// driver // FIXME: clean up and move into d_iface.h #define MAXVERTS 16 // max points in a surface polygon#define MAXWORKINGVERTS (MAXVERTS+4) // max points in an intermediate										// polygon (while processing)// !!! if this is changed, it must be changed in d_ifacea.h too !!!#define MAXHEIGHT 1024#define MAXWIDTH 1280#define MAXDIMENSION ((MAXHEIGHT > MAXWIDTH) ? MAXHEIGHT : MAXWIDTH) #define SIN_BUFFER_SIZE (MAXDIMENSION+CYCLE) #define INFINITE_DISTANCE 0x10000 // distance that's always guaranteed to										// be farther away than anything in										// the scene //=================================================================== extern void R_DrawLine (polyvert_t *polyvert0, polyvert_t *polyvert1); extern int cachewidth;extern pixel_t *cacheblock;extern int screenwidth; extern float pixelAspect; extern int r_drawnpolycount; extern cvar_t r_clearcolor; extern int sintable[SIN_BUFFER_SIZE];extern int intsintable[SIN_BUFFER_SIZE]; extern vec3_t vup, base_vup;extern vec3_t vpn, base_vpn;extern vec3_t vright, base_vright;extern entity_t *currententity; #define NUMSTACKEDGES 2400#define MINEDGES NUMSTACKEDGES#define NUMSTACKSURFACES 800#define MINSURFACES NUMSTACKSURFACES#define MAXSPANS 3000 // !!! if this is changed, it must be changed in asm_draw.h too !!!typedef struct espan_s{	int u, v, count;	struct espan_s *pnext;} espan_t; // FIXME: compress, make a union if that will help// insubmodel is only 1, flags is fewer than 32, spanstate could be a bytetypedef struct surf_s{	struct surf_s *next; // active surface stack in r_edge.c	struct surf_s *prev; // used in r_edge.c for active surf stack	struct espan_s *spans; // pointer to linked list of spans to draw	int key; // sorting key (BSP order)	int last_u; // set during tracing	int spanstate; // 0 = not in span									// 1 = in span									// -1 = in inverted span (end before									// start)	int flags; // currentface flags	void *data; // associated data like msurface_t	entity_t *entity;	float nearzi; // nearest 1/z on surface, for mipmapping	bool insubmodel;	float d_ziorigin, d_zistepu, d_zistepv; 	int pad[2]; // to 64 bytes} surf_t; extern surf_t *surfaces, *surface_p, *surf_max; // surfaces are generated in back to front order by the bsp, so if a surf// pointer is greater than another one, it should be drawn in front// surfaces[1] is the background, and is used as the active surface stack.// surfaces[0] is a dummy, because index 0 is used to indicate no surface// attached to an edge_t //=================================================================== extern vec3_t sxformaxis[4]; // s axis transformed into viewspaceextern vec3_t txformaxis[4]; // t axis transformed into viewspac extern vec3_t modelorg, base_modelorg; extern float xcenter, ycenter;extern float xscale, yscale;extern float xscaleinv, yscaleinv;extern float xscaleshrink, yscaleshrink; extern int d_lightstylevalue[256]; // 8.8 frac of base light value extern void TransformVector (vec3_t in, vec3_t out);extern void SetUpForLineScan(fixed8_t startvertu, fixed8_t startvertv,	fixed8_t endvertu, fixed8_t endvertv); extern int r_skymade;extern void R_MakeSky (void); extern int ubasestep, errorterm, erroradjustup, erroradjustdown; // flags in finalvert_t.flags#define ALIAS_LEFT_CLIP 0x0001#define ALIAS_TOP_CLIP 0x0002#define ALIAS_RIGHT_CLIP 0x0004#define ALIAS_BOTTOM_CLIP 0x0008#define ALIAS_Z_CLIP 0x0010// !!! if this is changed, it must be changed in d_ifacea.h too !!!#define ALIAS_ONSEAM 0x0020 // also defined in modelgen.h;											// must be kept in sync#define ALIAS_XY_CLIP_MASK 0x000F // !!! if this is changed, it must be changed in asm_draw.h too !!!typedef struct edge_s{	fixed16_t u;	fixed16_t u_step;	struct edge_s *prev, *next;	unsigned short surfs[2];	struct edge_s *nextremove;	float nearzi;	medge_t *owner;} edge_t;