ref: e65eec36dd5aa7223691f9557e8236ee78fbd1a9
dir: /d_local.h/
// d_local.h: private rasterization driver defs
//
// TODO: fine-tune this; it's based on providing some overage even if there
// is a 2k-wide scan, with subdivision every 8, for 256 spans of 12 bytes each
//
#define SCANBUFFERPAD 0x1000
#define R_SKY_SMASK 0x007F0000
#define R_SKY_TMASK 0x007F0000
#define DS_SPAN_LIST_END -128
#define SURFCACHE_SIZE_AT_320X200 600*1024
typedef struct surfcache_s
{
struct surfcache_s *next;
struct surfcache_s **owner; // NULL is an empty chunk of memory
int lightadj[MAXLIGHTMAPS]; // checked for strobe flush
int dlight;
int size; // including header
unsigned width;
unsigned height; // DEBUG only needed for debug
float mipscale;
struct texture_s *texture; // checked for animating textures
byte data[4]; // width*height elements
} surfcache_t;
// !!! if this is changed, it must be changed in asm_draw.h too !!!
typedef struct sspan_s
{
int u, v, count;
} sspan_t;
typedef u16int uzint;
extern cvar_t d_subdiv16;
extern float scale_for_mip;
extern bool d_roverwrapped;
extern surfcache_t *sc_rover;
extern surfcache_t *d_initial_rover;
extern float d_sdivzstepu, d_tdivzstepu, d_zistepu;
extern float d_sdivzstepv, d_tdivzstepv, d_zistepv;
extern float d_sdivzorigin, d_tdivzorigin, d_ziorigin;
extern fixed16_t sadjust, tadjust;
extern fixed16_t bbextents, bbextentt;
void D_DrawSpans16 (espan_t *pspans, int forceblend, byte alpha);
void D_DrawZSpans (espan_t *pspans);
void Turbulent8 (espan_t *pspan, byte alpha);
void D_DrawSkyScans8 (espan_t *pspan);
void R_ShowSubDiv (void);
surfcache_t *D_CacheSurface (msurface_t *surface, int miplevel);
extern uzint *d_pzbuffer;
extern unsigned int d_zrowbytes, d_zwidth;
extern int *d_pscantable;
extern int d_scantable[MAXHEIGHT];
extern int d_vrectx, d_vrecty, d_vrectright_particle, d_vrectbottom_particle;
extern int d_pix_min, d_pix_max;
extern pixel_t *d_viewbuffer;
extern uzint *zspantable[MAXHEIGHT];
extern int d_minmip;
extern float d_scalemip[3];
enum {
// perhaps a bit too much, but looks ok
AlphaStep = 2,
};
extern byte *alphamap[256>>AlphaStep];
#define blendalpha(a, b, alpha) \
alphamap[alpha>>AlphaStep][(u16int)((a)<<8 | (b))]
void initalpha(void);
float alphafor(int flags);