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A slightly better PDC_napms() for DOS. DJGPP should be fine-grained, but

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I haven't been able to see the difference yet. I'm not really happy with
this routine, but I feel like I could spend another month on it alone.
This commit is contained in:
William McBrine
2007-01-01 20:40:24 +00:00
parent 529beaa77c
commit 314585a105
1 changed files with 19 additions and 9 deletions
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28
dos/pdcutil.c
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@@ -19,7 +19,7 @@
#include <time.h>
RCSID("$Id: pdcutil.c,v 1.17 2006/12/29 21:16:32 wmcbrine Exp $");
RCSID("$Id: pdcutil.c,v 1.18 2007/01/01 20:40:24 wmcbrine Exp $");
void PDC_beep(void)
{
@@ -32,26 +32,36 @@ void PDC_beep(void)
PDCINT(0x10, regs);
}
#ifdef __DJGPP__
# define PDCCLOCK_T uclock_t
# define PDCCLOCK() uclock()
#else
# define PDCCLOCK_T long
# define PDCCLOCK() getdosmemdword(0x46c)
#endif
void PDC_napms(int ms)
{
PDCREGS regs;
long goal;
PDCCLOCK_T goal;
PDC_LOG(("PDC_napms() - called: ms=%d\n", ms));
goal = ms / 50;
#ifdef __DJGPP__
goal = (PDCCLOCK_T)ms * UCLOCKS_PER_SEC / 1000;
#else
goal = DIVROUND((PDCCLOCK_T)ms, 50);
#endif
if (!goal)
goal = 1;
goal++;
/* get number of ticks since startup from address 0040:006ch
1 sec. = 18.2065 */
goal += PDCCLOCK();
goal += getdosmemdword(0x46c);
while (goal > getdosmemdword(0x46c))
while (goal > PDCCLOCK())
{
regs.W.ax = 0x1680;
PDCINT(0x2f, regs);
PDCINT(0x28, regs);
}
}