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Probably fix the zoom crash encountered with Mapster32 and CBP8.

Browse source 
Described here:
http://forums.duke4.net/topic/3857-the-crash-thread/page__view__findpost__p__141202

git-svn-id: https://svn.eduke32.com/eduke32@3188 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2012-11-15 21:10:00 +00:00
parent 9434025e6d
commit 5e049afa5d
2 changed files with 24 additions and 14 deletions
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5
polymer/eduke32/build/include/build.h
View file

@ -312,14 +312,11 @@ typedef struct {
uint8_t filler;
float alpha;
spritetype *tspr;
#if !defined UINTPTR_MAX
# error Need UINTPTR_MAX define to select between 32- and 64-bit structs
#endif
#if UINTPTR_MAX == 0xffffffff
/* On a 32-bit build, pad the struct so it has the same size everywhere.
* REMINDER: Will break savegames. */
/* On a 32-bit build, pad the struct so it has the same size everywhere. */
intptr_t dummy_;
#endif
} spriteext_t;

33
polymer/eduke32/build/src/engine.c
View file

@ -1281,8 +1281,8 @@ static spritetype *loadsprite;
#define CM_CEILINGZ(Sec) (*(int32_t *)&sector[Sec].visibility) // visibility,filler,lotag
// backup of original normalized coordinates
#define CM_WALL_X(Wal) (*(int32_t *)&wall[Wal].picnum)
#define CM_WALL_Y(Wal) (*(int32_t *)&wall[Wal].lotag)
#define CM_WALL_X(Wal) (*(int32_t *)&wall[Wal].picnum) // picnum, overpicnum
#define CM_WALL_Y(Wal) (*(int32_t *)&wall[Wal].lotag) // lotag, hitag
// don't rotate when applying clipping, for models with rotational symmetry
#define CM_NOROT(Spri) (sprite[Spri].cstat&2)
@ -6605,6 +6605,19 @@ static void fillpolygon(int32_t npoints)
faketimerhandler();
}
static inline int32_t addscaleclamp(int32_t a, int32_t b, int32_t s1, int32_t s2)
{
// a + scale(b, s1, s1-s2), but without arithmetic exception when the
// scale() expression overflows
double tmp = (double)a + ((double)b*s1)/(s1-s2);
if (tmp <= INT32_MIN+1)
return INT32_MIN+1;
if (tmp >= INT32_MAX)
return INT32_MAX;
return tmp;
}
//
// clippoly (internal)
@ -6637,8 +6650,8 @@ static int32_t clippoly(int32_t npoints, int32_t clipstat)
}
if ((s1^s2) < 0)
{
rx2[npoints2] = rx1[z]+scale(rx1[zz]-rx1[z],s1,s1-s2);
ry2[npoints2] = ry1[z]+scale(ry1[zz]-ry1[z],s1,s1-s2);
rx2[npoints2] = addscaleclamp(rx1[z], rx1[zz]-rx1[z], s1, s2);
ry2[npoints2] = addscaleclamp(ry1[z], ry1[zz]-ry1[z], s1, s2);
if (s1 < 0) p2[splitcnt++] = npoints2;
xb2[npoints2] = npoints2+1;
npoints2++;
@ -6686,8 +6699,8 @@ static int32_t clippoly(int32_t npoints, int32_t clipstat)
}
if ((s1^s2) < 0)
{
rx1[npoints] = rx2[z]+scale(rx2[zz]-rx2[z],s1,s1-s2);
ry1[npoints] = ry2[z]+scale(ry2[zz]-ry2[z],s1,s1-s2);
rx1[npoints] = addscaleclamp(rx2[z], rx2[zz]-rx2[z], s1, s2);
ry1[npoints] = addscaleclamp(ry2[z], ry2[zz]-ry2[z], s1, s2);
if (s1 < 0) p2[splitcnt++] = npoints;
xb1[npoints] = npoints+1;
npoints++;
@ -6736,8 +6749,8 @@ static int32_t clippoly(int32_t npoints, int32_t clipstat)
}
if ((s1^s2) < 0)
{
rx2[npoints2] = rx1[z]+scale(rx1[zz]-rx1[z],s1,s1-s2);
ry2[npoints2] = ry1[z]+scale(ry1[zz]-ry1[z],s1,s1-s2);
rx2[npoints2] = addscaleclamp(rx1[z], rx1[zz]-rx1[z], s1, s2);
ry2[npoints2] = addscaleclamp(ry1[z], ry1[zz]-ry1[z], s1, s2);
if (s1 < 0) p2[splitcnt++] = npoints2;
xb2[npoints2] = npoints2+1;
npoints2++;
@ -6785,8 +6798,8 @@ static int32_t clippoly(int32_t npoints, int32_t clipstat)
}
if ((s1^s2) < 0)
{
rx1[npoints] = rx2[z]+scale(rx2[zz]-rx2[z],s1,s1-s2);
ry1[npoints] = ry2[z]+scale(ry2[zz]-ry2[z],s1,s1-s2);
rx1[npoints] = addscaleclamp(rx2[z], rx2[zz]-rx2[z], s1, s2);
ry1[npoints] = addscaleclamp(ry2[z], ry2[zz]-ry2[z], s1, s2);
if (s1 < 0) p2[splitcnt++] = npoints;
xb1[npoints] = npoints+1;
npoints++;