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engine.c: in calc_bufplc(), cope with negative lwall[] values. 

This should fix the crash encountered here:
http://forums.duke4.net/topic/1348-mapster32-problems-and-bugs/page__view__findpost__p__184069

a-c.c also gets a new switch macro, DEBUG_WITH_VALGRIND.

git-svn-id: https://svn.eduke32.com/eduke32@4292 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2014-02-02 10:50:44 +00:00
parent 21a8788b6b
commit 546a112741
2 changed files with 22 additions and 2 deletions
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19
polymer/eduke32/build/src/a-c.c
View File

@ -8,6 +8,15 @@
#include "a.h"
// For this, it's also sensible to uncomment DEBUG_ALLOCACHE_AS_MALLOC:
//#define DEBUG_WITH_VALGRIND
#ifdef DEBUG_WITH_VALGRIND
// For debugging with Valgrind + GDB, see
// http://valgrind.org/docs/manual/manual-core-adv.html#manual-core-adv.gdbserver
# include <valgrind/memcheck.h>
#endif
#ifdef ENGINE_USING_A_C
int32_t krecip(int32_t num); // from engine.c
@ -122,9 +131,19 @@ static inline uint32_t ourmulscale32(uint32_t a, uint32_t b)
static inline int32_t getpix(int32_t logy, const char *buf, uint32_t vplc)
{
if (logy != 0)
{
#ifdef DEBUG_WITH_VALGRIND
VALGRIND_CHECK_MEM_IS_DEFINED(&buf[vplc>>logy], 1);
#endif
return buf[vplc>>logy];
}
else
{
#ifdef DEBUG_WITH_VALGRIND
VALGRIND_CHECK_MEM_IS_DEFINED(&buf[ourmulscale32(vplc,globaltilesizy)], 1);
#endif
return buf[ourmulscale32(vplc,globaltilesizy)];
}
}
void setupvlineasm(int32_t neglogy) { glogy = neglogy; }

5
polymer/eduke32/build/src/engine.c
View File

@ -2745,12 +2745,13 @@ static WSHELPER_DECL void tweak_tsizes(int32_t *tsizx, int32_t *tsizy)
static WSHELPER_DECL void calc_bufplc(intptr_t *bufplc, int32_t lw, int32_t tsizx, int32_t tsizy)
{
// CAUTION: lw can be negative!
int32_t i = lw + globalxpanning;
if (i >= tsizx)
// if (i >= tsizx)
{
if (tsizx < 0)
i %= tsizx;
i = (uint32_t)i % tsizx;
else
i &= tsizx;
}