mirror of
https://github.com/ZDoom/raze-gles.git
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269 lines
7.9 KiB
C++
269 lines
7.9 KiB
C++
// "Build Engine & Tools" Copyright (c) 1993-1997 Ken Silverman
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// Ken Silverman's official web site: "http://www.advsys.net/ken"
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// See the included license file "BUILDLIC.TXT" for license info.
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//
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// This file has been modified from Ken Silverman's original release
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// by Jonathon Fowler (jf@jonof.id.au)
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// by the EDuke32 team (development@voidpoint.com)
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#pragma once
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#ifndef ENGINE_PRIV_H
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#define ENGINE_PRIV_H
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#define MAXARTFILES_BASE 200
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#define MAXARTFILES_TOTAL 220
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#define MAXCLIPDIST 1024
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// Uncomment to clear the screen before each top-level draw (classic only).
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// FIXME: doesn't work with mirrors.
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//#define ENGINE_CLEAR_SCREEN
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extern intptr_t asm1, asm2;
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extern int32_t globalx1, globaly2;
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extern uint16_t sqrtable[4096], shlookup[4096+256],sqrtable_old[2048];
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static inline int32_t nsqrtasm(uint32_t a)
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{
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// JBF 20030901: This was a damn lot simpler to reverse engineer than
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// msqrtasm was. Really, it was just like simplifying an algebra equation.
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uint16_t c;
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if (a & 0xff000000) // test eax, 0xff000000 / jnz short over24
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{
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c = shlookup[(a >> 24) + 4096]; // mov ebx, eax
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// over24: shr ebx, 24
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// mov cx, word ptr shlookup[ebx*2+8192]
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}
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else
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{
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c = shlookup[a >> 12]; // mov ebx, eax
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// shr ebx, 12
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// mov cx, word ptr shlookup[ebx*2]
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// jmp short under24
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}
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a >>= c&0xff; // under24: shr eax, cl
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a = (a&0xffff0000)|(sqrtable[a]); // mov ax, word ptr sqrtable[eax*2]
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a >>= ((c&0xff00) >> 8); // mov cl, ch
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// shr eax, cl
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return a;
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}
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static inline int32_t getclipmask(int32_t a, int32_t b, int32_t c, int32_t d)
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{
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// Ken did this
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d = ((a<0)<<3) + ((b<0)<<2) + ((c<0)<<1) + (d<0);
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return (((d<<4)^0xf0)|d);
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}
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inline int32_t ksqrtasm_old(int32_t n)
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{
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uint32_t shift = 0;
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n = klabs((int32_t)n);
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while (n >= 2048)
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{
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n >>= 2;
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++shift;
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}
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uint32_t const s = sqrtable_old[n];
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return (s << shift) >> 10;
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}
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inline int32_t clip_nsqrtasm(int32_t n)
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{
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if (enginecompatibility_mode == ENGINECOMPATIBILITY_19950829)
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return ksqrtasm_old(n);
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return nsqrtasm(n);
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}
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extern int16_t thesector[MAXWALLSB], thewall[MAXWALLSB];
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extern int16_t bunchfirst[MAXWALLSB], bunchlast[MAXWALLSB];
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extern int16_t maskwall[MAXWALLSB], maskwallcnt;
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extern tspriteptr_t tspriteptr[MAXSPRITESONSCREEN + 1];
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extern int32_t xdimen, xdimenrecip, halfxdimen, xdimenscale, xdimscale, ydimen;
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extern float fxdimen;
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extern int32_t globalposx, globalposy, globalposz;
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extern fixed_t qglobalhoriz, qglobalang;
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extern float fglobalposx, fglobalposy, fglobalposz;
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extern int16_t globalang, globalcursectnum;
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extern int32_t globalpal, cosglobalang, singlobalang;
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extern int32_t cosviewingrangeglobalang, sinviewingrangeglobalang;
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extern int32_t xyaspect;
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extern int32_t globalshade;
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extern int16_t globalpicnum;
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extern int32_t globalorientation;
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extern int16_t editstatus;
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extern int16_t searchit;
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extern int32_t searchx, searchy;
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extern int16_t searchsector, searchwall, searchstat;
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extern int16_t searchbottomwall, searchisbottom;
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extern char inpreparemirror;
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extern int16_t sectorborder[256];
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extern int32_t hitallsprites;
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extern int32_t xb1[MAXWALLSB];
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extern int32_t rx1[MAXWALLSB], ry1[MAXWALLSB];
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extern int16_t bunchp2[MAXWALLSB];
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extern int16_t numscans, numbunches;
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extern int32_t rxi[8], ryi[8];
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// int32_t wallmost(int16_t *mostbuf, int32_t w, int32_t sectnum, char dastat);
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int32_t wallfront(int32_t l1, int32_t l2);
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void set_globalang(fixed_t const ang);
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int32_t animateoffs(int tilenum, int fakevar);
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static FORCE_INLINE int32_t bad_tspr(tspriteptr_t tspr)
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{
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// NOTE: tspr->owner >= MAXSPRITES (could be model) has to be handled by
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// caller.
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return (tspr->owner < 0 || (unsigned)tspr->picnum >= MAXTILES);
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}
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//
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// getpalookup (internal)
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//
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static FORCE_INLINE int32_t getpalookup(int32_t davis, int32_t dashade)
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{
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if (getpalookup_replace)
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return getpalookup_replace(davis, dashade);
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return min(max(dashade + (davis >> 8), 0), numshades - 1);
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}
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static FORCE_INLINE int32_t getpalookupsh(int32_t davis) { return getpalookup(davis, globalshade) << 8; }
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////// yax'y stuff //////
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#ifdef USE_OPENGL
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extern void polymost_scansector(int32_t sectnum);
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#endif
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int32_t renderAddTsprite(int16_t z, int16_t sectnum);
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static FORCE_INLINE void setgotpic(int32_t tilenume)
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{
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gotpic[tilenume>>3] |= pow2char[tilenume&7];
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}
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// Get properties of parallaxed sky to draw.
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// Returns: pointer to tile offset array. Sets-by-pointer the other three.
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const int16_t* getpsky(int32_t picnum, int32_t* dapyscale, int32_t* dapskybits, int32_t* dapyoffs, int32_t* daptileyscale);
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static FORCE_INLINE void set_globalpos(int32_t const x, int32_t const y, int32_t const z)
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{
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globalposx = x, fglobalposx = (float)x;
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globalposy = y, fglobalposy = (float)y;
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globalposz = z, fglobalposz = (float)z;
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}
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template <typename T> static FORCE_INLINE void tileUpdatePicnum(T * const tileptr, int const obj)
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{
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auto &tile = *tileptr;
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if (picanm[tile].sf & PICANM_ANIMTYPE_MASK)
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tile += animateoffs(tile, obj);
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if (((obj & 16384) == 16384) && (globalorientation & CSTAT_WALL_ROTATE_90) && RotTile(tile).newtile != -1)
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tile = RotTile(tile).newtile;
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}
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// x1, y1: in/out
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// rest x/y: out
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template <typename T>
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static inline void get_wallspr_points(T const * const spr, int32_t *x1, int32_t *x2,
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int32_t *y1, int32_t *y2)
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{
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//These lines get the 2 points of the rotated sprite
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//Given: (x1, y1) starts out as the center point
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const int32_t tilenum=spr->picnum, ang=spr->ang;
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const int32_t xrepeat = spr->xrepeat;
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int32_t xoff = tileLeftOffset(tilenum) + spr->xoffset;
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int32_t k, l, dax, day;
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if (spr->cstat&4)
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xoff = -xoff;
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dax = bsin(ang) * xrepeat;
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day = -bcos(ang) * xrepeat;
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l = tileWidth(tilenum);
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k = (l>>1)+xoff;
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*x1 -= mulscale16(dax,k);
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*x2 = *x1 + mulscale16(dax,l);
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*y1 -= mulscale16(day,k);
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*y2 = *y1 + mulscale16(day,l);
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}
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// x1, y1: in/out
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// rest x/y: out
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template <typename T>
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static inline void get_floorspr_points(T const * const spr, int32_t px, int32_t py,
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int32_t *x1, int32_t *x2, int32_t *x3, int32_t *x4,
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int32_t *y1, int32_t *y2, int32_t *y3, int32_t *y4)
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{
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const int32_t tilenum = spr->picnum;
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const int32_t cosang = bcos(spr->ang);
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const int32_t sinang = bsin(spr->ang);
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vec2_t const span = { tileWidth(tilenum), tileHeight(tilenum)};
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vec2_t const repeat = { spr->xrepeat, spr->yrepeat };
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vec2_t adjofs = { tileLeftOffset(tilenum) + spr->xoffset, tileTopOffset(tilenum) + spr->yoffset };
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if (spr->cstat & 4)
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adjofs.x = -adjofs.x;
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if (spr->cstat & 8)
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adjofs.y = -adjofs.y;
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vec2_t const center = { ((span.x >> 1) + adjofs.x) * repeat.x, ((span.y >> 1) + adjofs.y) * repeat.y };
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vec2_t const rspan = { span.x * repeat.x, span.y * repeat.y };
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vec2_t const ofs = { -mulscale16(cosang, rspan.y), -mulscale16(sinang, rspan.y) };
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*x1 += dmulscale16(sinang, center.x, cosang, center.y) - px;
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*y1 += dmulscale16(sinang, center.y, -cosang, center.x) - py;
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*x2 = *x1 - mulscale16(sinang, rspan.x);
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*y2 = *y1 + mulscale16(cosang, rspan.x);
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*x3 = *x2 + ofs.x, *x4 = *x1 + ofs.x;
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*y3 = *y2 + ofs.y, *y4 = *y1 + ofs.y;
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}
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inline int widthBits(int num)
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{
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int w = tileWidth(num);
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int j = 15;
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while ((j > 1) && ((1 << j) > w))
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j--;
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return j;
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}
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inline int heightBits(int num)
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{
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int w = tileHeight(num);
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int j = 15;
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while ((j > 1) && ((1 << j) > w))
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j--;
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return j;
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}
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#endif /* ENGINE_PRIV_H */
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