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Make ksqrt take uint32_t, add helper function uint32_t uhypsq(int32_t,int32_t).

Browse source 
uhypsq calculates the hypotenuse using unsigned multiplication. This is
permissible since for arbitrary int32s a and b, the following holds in
two's complement arithmetic:
  (int32_t)((uint32_t)a * b) == (int32_t)((int64_t)a * b)
("Signed and unsigned multiplication is the same on the bit level.")

This fixes various overflows where wall lengths for walls of length > 46340
are calculated, but does not rid us of other overflows in the same vein
(usually dot products between vectors where one point is a wall vertex and
the other a position in a sector).

git-svn-id: https://svn.eduke32.com/eduke32@2791 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2012-07-01 22:11:14 +00:00
parent 9431207c74
commit 54721d7461
9 changed files with 39 additions and 30 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
polymer/eduke32/build/include/build.h
View file

@ -656,7 +656,7 @@ int32_t checksectorpointer(int16_t i, int16_t sectnum);
void getmousevalues(int32_t *mousx, int32_t *mousy, int32_t *bstatus) ATTRIBUTE((nonnull(1,2,3)));
int32_t krand(void);
int32_t ksqrt(int32_t num);
int32_t ksqrt(uint32_t num);
// int32_t getangle(int32_t xvect, int32_t yvect);
//
@ -665,6 +665,11 @@ int32_t ksqrt(int32_t num);
EXTERN int16_t radarang[1280];
static inline uint32_t uhypsq(int32_t dx, int32_t dy)
{
return (uint32_t)dx*dx + (uint32_t)dy*dy;
}
static inline int32_t getangle(int32_t xvect, int32_t yvect)
{
if ((xvect|yvect) == 0) return(0);

2
polymer/eduke32/build/src/build.c
View file

@ -8345,7 +8345,7 @@ int32_t wallength(int16_t i)
if (hypsq > (int64_t)INT32_MAX)
return (int32_t)sqrt((double)hypsq);
else
return ksqrt((int32_t)hypsq);
return ksqrt((uint32_t)hypsq);
#else
return ksqrt(dax*dax + day*day);
#endif

28
polymer/eduke32/build/src/engine.c
View file

@ -1611,7 +1611,7 @@ int32_t clipmapinfo_load(void)
}
else
{
int32_t tmp = ksqrt(wall[w].x*wall[w].x + wall[w].y*wall[w].y);
int32_t tmp = ksqrt(uhypsq(wall[w].x, wall[w].y));
if (tmp > maxdist)
maxdist = tmp;
}
@ -3212,7 +3212,7 @@ static int32_t wallmost(int16_t *mostbuf, int32_t w, int32_t sectnum, char dasta
fw = sector[sectnum].wallptr; i = wall[fw].point2;
dx = wall[i].x-wall[fw].x; dy = wall[i].y-wall[fw].y;
dasqr = krecipasm(nsqrtasm(dx*dx+dy*dy));
dasqr = krecipasm(nsqrtasm(uhypsq(dx,dy)));
if (xb1[w] == 0)
{ xv = cosglobalang+sinviewingrangeglobalang; yv = singlobalang-cosviewingrangeglobalang; }
@ -3238,6 +3238,7 @@ static int32_t wallmost(int16_t *mostbuf, int32_t w, int32_t sectnum, char dasta
{ xv = cosglobalang-sinviewingrangeglobalang; yv = singlobalang+cosviewingrangeglobalang; }
else
{ xv = (x2+x1)-globalposx; yv = (y2+y1)-globalposy; }
// XXX: OVERFLOW with huge sectors and sloped ceilngs/floors!
i = xv*(y1-globalposy)-yv*(x1-globalposx); j = yv*x2-xv*y2;
if (klabs(j) > klabs(i>>3)) i = divscale28(i,j);
if (dastat == 0)
@ -3392,7 +3393,7 @@ static int32_t setup_globals_cf1(const sectortype *sec, int32_t pal, int32_t zd,
j = sec->wallptr;
ox = wall[wall[j].point2].x - wall[j].x;
oy = wall[wall[j].point2].y - wall[j].y;
i = nsqrtasm(ox*ox+oy*oy); if (i == 0) i = 1024; else i = 1048576/i;
i = nsqrtasm(uhypsq(ox,oy)); if (i == 0) i = 1024; else i = 1048576/i;
globalx1 = mulscale10(dmulscale10(ox,singlobalang,-oy,cosglobalang),i);
globaly1 = mulscale10(dmulscale10(ox,cosglobalang,oy,singlobalang),i);
globalx2 = -globalx1;
@ -4180,7 +4181,7 @@ static void grouscan(int32_t dax1, int32_t dax2, int32_t sectnum, char dastat)
wal = &wall[sec->wallptr];
wx = wall[wal->point2].x - wal->x;
wy = wall[wal->point2].y - wal->y;
dasqr = krecipasm(nsqrtasm(wx*wx+wy*wy));
dasqr = krecipasm(nsqrtasm(uhypsq(wx,wy)));
i = mulscale21(daslope,dasqr);
wx *= i; wy *= i;
@ -4200,6 +4201,7 @@ static void grouscan(int32_t dax1, int32_t dax2, int32_t sectnum, char dastat)
dx = mulscale14(wall[wal->point2].x-wal->x,dasqr);
dy = mulscale14(wall[wal->point2].y-wal->y,dasqr);
// NOTE: sector[].*heinum is int16_t and not supposed to be <0.
i = nsqrtasm(daslope*daslope+16777216);
x = globalx; y = globaly;
@ -8886,7 +8888,7 @@ void drawmapview(int32_t dax, int32_t day, int32_t zoome, int16_t ang)
{
ox = wall[wall[startwall].point2].x - wall[startwall].x;
oy = wall[wall[startwall].point2].y - wall[startwall].y;
i = nsqrtasm(ox*ox+oy*oy); if (i == 0) continue;
i = nsqrtasm(uhypsq(ox,oy)); if (i == 0) continue;
i = 1048576/i;
globalx1 = mulscale10(dmulscale10(ox,bakgxvect,oy,bakgyvect),i);
globaly1 = mulscale10(dmulscale10(ox,bakgyvect,-oy,bakgxvect),i);
@ -10810,7 +10812,7 @@ int32_t inside(int32_t x, int32_t y, int16_t sectnum)
//
// ksqrt
//
int32_t ksqrt(int32_t num)
int32_t ksqrt(uint32_t num)
{
return(nsqrtasm(num));
}
@ -11152,7 +11154,7 @@ static int32_t hitscan_trysector(const vec3_t *sv, const sectortype *sec, hitdat
{
wal = &wall[sec->wallptr]; wal2 = &wall[wal->point2];
dax = wal2->x-wal->x; day = wal2->y-wal->y;
i = nsqrtasm(dax*dax+day*day); if (i == 0) return 1; //continue;
i = nsqrtasm(uhypsq(dax,day)); if (i == 0) return 1; //continue;
i = divscale15(heinum,i);
dax *= i; day *= i;
@ -12068,7 +12070,7 @@ int32_t clipmove(vec3_t *pos, int16_t *sectnum,
cy = (pos->y+goaly)>>1;
//Extra walldist for sprites on sector lines
gx = goalx-(pos->x); gy = goaly-(pos->y);
rad = nsqrtasm(gx*gx + gy*gy) + MAXCLIPDIST+walldist + 8;
rad = nsqrtasm(uhypsq(gx,gy)) + MAXCLIPDIST+walldist + 8;
xmin = cx-rad; ymin = cy-rad;
xmax = cx+rad; ymax = cy+rad;
@ -14127,7 +14129,7 @@ int32_t getceilzofslope(int16_t sectnum, int32_t dax, int32_t day)
wal = &wall[sector[sectnum].wallptr];
// floor(sqrt(2**31-1)) == 46340
dx = wall[wal->point2].x-wal->x; dy = wall[wal->point2].y-wal->y;
i = (nsqrtasm(dx*dx+dy*dy)<<5); if (i == 0) return(sector[sectnum].ceilingz);
i = (nsqrtasm(uhypsq(dx,dy))<<5); if (i == 0) return(sector[sectnum].ceilingz);
j = dmulscale3(dx,day-wal->y,-dy,dax-wal->x);
return(sector[sectnum].ceilingz+(scale(sector[sectnum].ceilingheinum,j>>1,i)<<1));
}
@ -14147,7 +14149,7 @@ int32_t getflorzofslope(int16_t sectnum, int32_t dax, int32_t day)
wal = &wall[sector[sectnum].wallptr];
dx = wall[wal->point2].x-wal->x; dy = wall[wal->point2].y-wal->y;
i = (nsqrtasm(dx*dx+dy*dy)<<5); if (i == 0) return(sector[sectnum].floorz);
i = (nsqrtasm(uhypsq(dx,dy))<<5); if (i == 0) return(sector[sectnum].floorz);
j = dmulscale3(dx,day-wal->y,-dy,dax-wal->x);
return(sector[sectnum].floorz+(scale(sector[sectnum].floorheinum,j>>1,i)<<1));
}
@ -14169,7 +14171,7 @@ void getzsofslope(int16_t sectnum, int32_t dax, int32_t day, int32_t *ceilz, int
{
wal = &wall[sec->wallptr]; wal2 = &wall[wal->point2];
dx = wal2->x-wal->x; dy = wal2->y-wal->y;
i = (nsqrtasm(dx*dx+dy*dy)<<5); if (i == 0) return; // XXX: OVERFLOW
i = (nsqrtasm(uhypsq(dx,dy))<<5); if (i == 0) return;
j = dmulscale3(dx,day-wal->y,-dy,dax-wal->x);
if (sec->ceilingstat&2) *ceilz = (*ceilz)+(scale(sec->ceilingheinum,j>>1,i)<<1);
if (sec->floorstat&2) *florz = (*florz)+(scale(sec->floorheinum,j>>1,i)<<1);
@ -14191,7 +14193,7 @@ void alignceilslope(int16_t dasect, int32_t x, int32_t y, int32_t z)
i = (y-wal->y)*dax - (x-wal->x)*day; if (i == 0) return;
sector[dasect].ceilingheinum = scale((z-sector[dasect].ceilingz)<<8,
nsqrtasm(dax*dax+day*day),i);
nsqrtasm(uhypsq(dax,day)), i);
if (sector[dasect].ceilingheinum == 0) sector[dasect].ceilingstat &= ~2;
else sector[dasect].ceilingstat |= 2;
@ -14212,7 +14214,7 @@ void alignflorslope(int16_t dasect, int32_t x, int32_t y, int32_t z)
i = (y-wal->y)*dax - (x-wal->x)*day; if (i == 0) return;
sector[dasect].floorheinum = scale((z-sector[dasect].floorz)<<8,
nsqrtasm(dax*dax+day*day),i);
nsqrtasm(uhypsq(dax,day)), i);
if (sector[dasect].floorheinum == 0) sector[dasect].floorstat &= ~2;
else sector[dasect].floorstat |= 2;

2
polymer/eduke32/source/astub.c
View file

@ -6577,7 +6577,7 @@ static void Keys3d(void)
case 7:ma+=512; break;
}
a = ksqrt(mouseax*mouseax + mouseay*mouseay);
a = ksqrt(uhypsq(mouseax,mouseay));
if (a)
{
int32_t mult = (stat&8) ? 8192 : 8192*2;

4
polymer/eduke32/source/gameexec.c
View file

@ -2637,7 +2637,7 @@ nullquote:
if (hypsq > (int64_t)INT_MAX)
Gv_SetVarX(retvar, (int32_t)sqrt((double)hypsq));
else
Gv_SetVarX(retvar, ksqrt((int32_t)hypsq));
Gv_SetVarX(retvar, ksqrt((uint32_t)hypsq));
continue;
}
@ -3607,7 +3607,7 @@ nullquote:
// syntax sqrt <invar> <outvar>
int32_t lInVarID=*insptr++, lOutVarID=*insptr++;
Gv_SetVarX(lOutVarID, ksqrt(Gv_GetVarX(lInVarID)));
Gv_SetVarX(lOutVarID, ksqrt((uint32_t)Gv_GetVarX(lInVarID)));
continue;
}

2
polymer/eduke32/source/lunatic/defs.ilua
View file

@ -472,7 +472,7 @@ playerdata_t g_player[MAXPLAYERS];
-- functions
ffi.cdef[[
int32_t ksqrt(int32_t num);
int32_t ksqrt(uint32_t num);
]]
ffi.cdef "double gethitickms(void);"

2
polymer/eduke32/source/lunatic/test.elua
View file

@ -159,7 +159,7 @@ gameevent(gv.EVENT_ENTERLEVEL,
N, t, (t*1000)/N, sum)
printf("sqrt(0xffffffff) = %f(ksqrt) %f(math.sqrt)",
gv.ksqrt(-1), math.sqrt(0xffffffff))
gv.ksqrt(0xffffffff), math.sqrt(0xffffffff))
end
)

4
polymer/eduke32/source/m32exec.c
View file

@ -881,7 +881,7 @@ skip_check:
// syntax sqrt <invar> <outvar>
int32_t lInVarID=*insptr++, lOutVarID=*insptr++;
Gv_SetVarX(lOutVarID, ksqrt(Gv_GetVarX(lInVarID)));
Gv_SetVarX(lOutVarID, ksqrt((uint32_t)Gv_GetVarX(lInVarID)));
continue;
}
@ -1793,7 +1793,7 @@ badindex:
if (hypsq > (int64_t)INT32_MAX)
Gv_SetVarX(retvar, (int32_t)sqrt((double)hypsq));
else
Gv_SetVarX(retvar, ksqrt((int32_t)hypsq));
Gv_SetVarX(retvar, ksqrt((uint32_t)hypsq));
continue;
}

18
polymer/eduke32/source/player.c
View file

@ -4686,9 +4686,9 @@ void P_ProcessInput(int32_t snum)
}
else p->weapon_sway = p->bobcounter;
// NOTE: This overflows if the difference is too great, e.g. used to do
// NOTE: This silently wraps if the difference is too great, e.g. used to do
// that when teleported by silent SE7s.
s->xvel = ksqrt((p->pos.x-p->bobposx)*(p->pos.x-p->bobposx)+(p->pos.y-p->bobposy)*(p->pos.y-p->bobposy));
s->xvel = ksqrt(uhypsq(p->pos.x-p->bobposx, p->pos.y-p->bobposy));
if (p->on_ground)
p->bobcounter += sprite[p->i].xvel>>1;
@ -5630,7 +5630,9 @@ void computergetinput(int32_t snum, input_t *syn)
for (TRAVERSE_CONNECT(i))
if (i != snum && !(GTFLAGS(GAMETYPE_TDM) && g_player[snum].ps->team == g_player[i].ps->team))
{
dist = ksqrt((sprite[g_player[i].ps->i].x-x1)*(sprite[g_player[i].ps->i].x-x1)+(sprite[g_player[i].ps->i].y-y1)*(sprite[g_player[i].ps->i].y-y1));
const spritetype *const pspr = &sprite[g_player[i].ps->i];
dist = ksqrt(uhypsq(pspr->x-x1, pspr->y-y1));
x2 = sprite[g_player[i].ps->i].x;
y2 = sprite[g_player[i].ps->i].y;
@ -5742,7 +5744,7 @@ void computergetinput(int32_t snum, input_t *syn)
fightdist = fdmatrix[p->curr_weapon][g_player[goalplayer[snum]].ps->curr_weapon];
if (fightdist < 128) fightdist = 128;
dist = ksqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
dist = ksqrt(uhypsq(x2-x1, y2-y1));
if (dist == 0) dist = 1;
daang = getangle(x2+(g_player[goalplayer[snum]].ps->vel.x>>14)-x1,y2+(g_player[goalplayer[snum]].ps->vel.y>>14)-y1);
zang = 100-((z2-z1)*8)/dist;
@ -5860,7 +5862,7 @@ void computergetinput(int32_t snum, input_t *syn)
break;
}
dist = ksqrt(dx*dx+dy*dy);
dist = ksqrt(uhypsq(dx,dy));
if (dist > l)
{
l = dist;
@ -5906,7 +5908,7 @@ void computergetinput(int32_t snum, input_t *syn)
{
dx = wall[wall[i].point2].x-wall[i].x;
dy = wall[wall[i].point2].y-wall[i].y;
dist = ksqrt(dx*dx+dy*dy);
dist = ksqrt(uhypsq(dx,dy));
if ((wall[i].nextsector == goalsect[snum]) && (dist > l))
{
l = dist;
@ -5962,7 +5964,7 @@ void computergetinput(int32_t snum, input_t *syn)
}
x2 = goalx[snum];
y2 = goaly[snum];
dist = ksqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
dist = ksqrt(uhypsq(x2-x1, y2-y1));
if (!dist) return;
daang = getangle(x2-x1,y2-y1);
syn->fvel += (x2-x1)*2047/dist;
@ -6044,7 +6046,7 @@ void computergetinput(int32_t snum, input_t *syn)
{
x2 = goalx[snum];
y2 = goaly[snum];
dist = ksqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
dist = ksqrt(uhypsq(x2-x1, y2-y1));
if (!dist) return;
daang = getangle(x2-x1,y2-y1);
if ((goalwall[snum] >= 0) && (dist < 4096))